/* ============================================================
   GUITAR CHORDS LESSONS - Main Stylesheet
   guitar-chords-lessons.com
   A funky, modern dark-themed CSS for free guitar lessons
   ============================================================ */

/* ------------------------------------------------------------
   0. GOOGLE FONTS IMPORT
   ------------------------------------------------------------ */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ------------------------------------------------------------
   1. CSS CUSTOM PROPERTIES
   ------------------------------------------------------------ */
:root {
  /* --- Core palette --- */
  --color-bg-deepest:       #0d0d0d;
  --color-bg-dark:          #111111;
  --color-bg-card:          #1a1a1e;
  --color-bg-card-hover:    #222228;
  --color-bg-elevated:      #252530;
  --color-bg-input:         #18181c;

  /* --- Text --- */
  --color-text-primary:     #f0f0f0;
  --color-text-secondary:   #a1a1aa;
  --color-text-muted:       #6b6b76;
  --color-text-inverse:     #0d0d0d;

  /* --- Accent: Gold / Amber --- */
  --color-accent:           #e8a838;
  --color-accent-light:     #f0b84d;
  --color-accent-dark:      #c48820;
  --color-accent-glow:      rgba(232, 168, 56, 0.35);

  /* --- Accent: Electric Pink-to-Purple --- */
  --color-pink:             #f472b6;
  --color-purple:           #a855f7;
  --gradient-funky:         linear-gradient(135deg, #f472b6, #a855f7);
  --gradient-funky-reverse: linear-gradient(135deg, #a855f7, #f472b6);

  /* --- Semantic --- */
  --color-success:          #4ade80;
  --color-info:             #38bdf8;
  --color-warning:          #fbbf24;
  --color-danger:           #ef4444;

  /* --- Stage colours --- */
  --stage-1:                #4ade80;  /* Absolute Beginner */
  --stage-2:                #38bdf8;  /* Beginner */
  --stage-3:                #a78bfa;  /* Early Intermediate */
  --stage-4:                #e8a838;  /* Intermediate */
  --stage-5:                #f472b6;  /* Upper Intermediate */
  --stage-6:                #ef4444;  /* Advanced */
  --stage-7:                #fbbf24;  /* Expert */

  /* --- Typography --- */
  --font-body:              'Outfit', system-ui, -apple-system, sans-serif;
  --font-mono:              'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

  --fs-xs:    clamp(0.7rem,  0.65rem + 0.25vw, 0.8rem);
  --fs-sm:    clamp(0.8rem,  0.75rem + 0.3vw,  0.9rem);
  --fs-base:  clamp(0.95rem, 0.9rem  + 0.3vw,  1.1rem);
  --fs-md:    clamp(1.1rem,  1rem    + 0.4vw,  1.3rem);
  --fs-lg:    clamp(1.35rem, 1.15rem + 0.6vw,  1.7rem);
  --fs-xl:    clamp(1.7rem,  1.4rem  + 0.9vw,  2.4rem);
  --fs-2xl:   clamp(2.2rem,  1.7rem  + 1.5vw,  3.4rem);
  --fs-3xl:   clamp(2.8rem,  2rem    + 2.5vw,  4.8rem);

  --fw-light:    300;
  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;
  --fw-black:    900;

  --lh-tight:    1.15;
  --lh-snug:     1.3;
  --lh-normal:   1.6;
  --lh-relaxed:  1.8;

  /* --- Spacing --- */
  --space-2xs: 0.25rem;
  --space-xs:  0.5rem;
  --space-sm:  0.75rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;

  /* --- Radius --- */
  --radius-sm:   6px;
  --radius-md:   10px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* --- Shadows & Glows --- */
  --shadow-sm:    0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg:    0 8px 30px rgba(0,0,0,0.6);
  --shadow-xl:    0 16px 50px rgba(0,0,0,0.7);
  --glow-accent:  0 0 20px var(--color-accent-glow), 0 0 60px rgba(232,168,56,0.12);
  --glow-pink:    0 0 20px rgba(244,114,182,0.3), 0 0 60px rgba(168,85,247,0.12);

  /* --- Transitions --- */
  --ease-out-smooth: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-bounce:     cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition-fast:   150ms var(--ease-out-smooth);
  --transition-base:   250ms var(--ease-out-smooth);
  --transition-slow:   400ms var(--ease-out-smooth);
  --transition-slower:  600ms var(--ease-out-smooth);

  /* --- Layout --- */
  --header-height:     70px;
  --max-width:         1280px;
  --max-width-narrow:  860px;
  --sidebar-width:     280px;

  /* --- Z-index layers --- */
  --z-behind:    -1;
  --z-base:       1;
  --z-sticky:    100;
  --z-header:    500;
  --z-overlay:   900;
  --z-modal:    1000;
}

/* ------------------------------------------------------------
   2. CSS RESET
   ------------------------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: var(--space-lg);
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-deepest);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100vh;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input, button, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: var(--color-accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
  line-height: var(--lh-tight);
}

p {
  text-wrap: pretty;
}

::selection {
  background-color: var(--color-accent);
  color: var(--color-bg-deepest);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg-dark);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* Focus visible for keyboard accessibility */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ------------------------------------------------------------
   3. TYPOGRAPHY SYSTEM
   ------------------------------------------------------------ */
h1 {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-black);
  line-height: var(--lh-tight);
  letter-spacing: -0.03em;
}

h2 {
  font-size: var(--fs-2xl);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: -0.02em;
}

h3 {
  font-size: var(--fs-xl);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  letter-spacing: -0.015em;
}

h4 {
  font-size: var(--fs-lg);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
}

h5 {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-snug);
}

h6 {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  line-height: var(--lh-normal);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
}

.text-gradient {
  background: var(--gradient-funky);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-gold {
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent), #fde68a);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-glow {
  text-shadow: 0 0 30px var(--color-accent-glow);
}

.text-sm   { font-size: var(--fs-sm); }
.text-xs   { font-size: var(--fs-xs); }
.text-lg   { font-size: var(--fs-lg); }
.text-muted { color: var(--color-text-muted); }
.text-secondary { color: var(--color-text-secondary); }

.mono {
  font-family: var(--font-mono);
}

/* ------------------------------------------------------------
   4. LAYOUT UTILITIES
   ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ------------------------------------------------------------
   5. SITE HEADER
   ------------------------------------------------------------ */
.site-header {
  position: relative;
  z-index: var(--z-header);
  height: auto;
  display: flex;
  align-items: center;
  background: var(--color-bg-deepest);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-lg);
  min-height: var(--header-height);
}

/* --- Logo --- */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--fs-md);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  text-decoration: none;
  transition: transform var(--transition-fast);
}

.site-logo:hover {
  color: var(--color-text-primary);
  transform: scale(1.03);
}

.site-logo__icon {
  font-size: 1.6em;
  line-height: 1;
  filter: drop-shadow(0 0 8px var(--color-accent-glow));
}

.site-logo__text {
  display: flex;
  flex-direction: column;
  line-height: var(--lh-tight);
}

.site-logo__text span {
  font-size: var(--fs-xs);
  font-weight: var(--fw-regular);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

/* --- Navigation --- */
.site-nav {
  display: block;
  width: 100%;
  padding-bottom: var(--space-xs);
}

.site-nav__list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2xs) var(--space-xs);
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  font-size: 0.8rem;
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.site-nav__link:hover,
.site-nav__link.active {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.06);
}

.site-nav__link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 18px;
  height: 2px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
}

/* --- Tools Dropdown --- */
.site-nav__dropdown {
  position: relative;
}

/* The dropdown trigger is a <button> (not a link) so clicking it opens the
   menu instead of navigating — the "All Tools" item inside loads the page. */
.site-nav__toggle {
  background: transparent;
  border: 0;
  font-family: inherit;
  line-height: inherit;
  cursor: pointer;
}

.site-nav__caret {
  margin-left: 4px;
  transition: transform var(--transition-fast);
}

.site-nav__dropdown:hover .site-nav__caret,
.site-nav__dropdown.is-open .site-nav__caret {
  transform: rotate(180deg);
}

.site-nav__submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 180px;
  padding: var(--space-xs) 0;
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.5);
  z-index: var(--z-overlay);
  list-style: none;
}

.site-nav__dropdown:hover .site-nav__submenu,
.site-nav__dropdown.is-open .site-nav__submenu {
  display: block;
}

.site-nav__submenu li a {
  display: block;
  padding: 8px 20px;
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.site-nav__submenu li a:hover {
  color: var(--color-accent-light);
  background: rgba(255, 255, 255, 0.04);
}

.site-nav__divider {
  height: 1px;
  margin: var(--space-xs) var(--space-sm);
  background: rgba(255, 255, 255, 0.06);
}

/* First entry in the Tools dropdown — links to the full Tools hub page.
   Emphasised so it reads as the "load the Tools page" header of the menu. */
.site-nav__submenu li a.site-nav__submenu-lead {
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
}
.site-nav__submenu li a.site-nav__submenu-lead:hover {
  color: var(--color-accent-light);
}

/* --- Hamburger (hidden — nav is always visible) --- */
.hamburger {
  display: none;
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
}

/* --- Desktop breakpoint --- */
@media (min-width: 768px) {
  .site-nav {
    width: auto;
    padding-bottom: 0;
  }
  .site-nav__list {
    flex-wrap: nowrap;
    gap: var(--space-xs);
  }
  .site-nav__link {
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--fs-sm);
  }
}

/* ------------------------------------------------------------
   6. MOBILE NAV (SLIDE-OUT)
   ------------------------------------------------------------ */
.nav-mobile {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(320px, 85vw);
  z-index: var(--z-modal);
  background: var(--color-bg-dark);
  border-left: 1px solid rgba(255, 255, 255, 0.06);
  padding: var(--space-3xl) var(--space-xl) var(--space-xl);
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.nav-mobile.is-open {
  transform: translateX(0);
}

.nav-mobile__overlay {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-modal) - 1);
  background: rgba(0, 0, 0, 0.65);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.nav-mobile__overlay.is-visible {
  opacity: 1;
  visibility: visible;
}

.nav-mobile__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.nav-mobile__link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-md);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast), padding-left var(--transition-fast);
}

.nav-mobile__link:hover,
.nav-mobile__link.active {
  color: var(--color-accent-light);
  background: rgba(232, 168, 56, 0.08);
  padding-left: var(--space-lg);
}

.nav-mobile__divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.06);
  margin: var(--space-md) 0;
}

/* Mobile nav label */
.nav-mobile__label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  padding: 0 var(--space-md);
  margin-bottom: var(--space-xs);
}

/* Body lock when mobile nav is open */
body.nav-open {
  overflow: hidden;
}

/* ------------------------------------------------------------
   7. HERO SECTION
   ------------------------------------------------------------ */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: max(85vh, 550px);
  padding: var(--space-3xl) var(--space-lg) var(--space-3xl);
  text-align: center;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(232, 168, 56, 0.08), transparent 60%),
    radial-gradient(ellipse 60% 50% at 80% 20%, rgba(168, 85, 247, 0.07), transparent 50%),
    radial-gradient(ellipse 50% 40% at 20% 70%, rgba(244, 114, 182, 0.06), transparent 50%),
    var(--color-bg-deepest);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 50px,
      rgba(255, 255, 255, 0.012) 50px,
      rgba(255, 255, 255, 0.012) 51px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 50px,
      rgba(255, 255, 255, 0.012) 50px,
      rgba(255, 255, 255, 0.012) 51px
    );
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 120px;
  background: linear-gradient(to top, var(--color-bg-deepest), transparent);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: var(--z-base);
  max-width: 820px;
  animation: fade-up 0.8s var(--ease-out-smooth) both;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-2xs) var(--space-md);
  margin-bottom: var(--space-lg);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-accent-light);
  background: rgba(232, 168, 56, 0.1);
  border: 1px solid rgba(232, 168, 56, 0.2);
  border-radius: var(--radius-full);
  animation: pulse-glow 3s ease-in-out infinite;
}

.hero__title {
  font-size: var(--fs-3xl);
  font-weight: var(--fw-black);
  line-height: 1.05;
  letter-spacing: -0.04em;
  margin-bottom: var(--space-lg);
}

.hero__title-gradient {
  display: block;
  background: linear-gradient(
    135deg,
    var(--color-accent-light) 0%,
    var(--color-accent) 25%,
    var(--color-pink) 50%,
    var(--color-purple) 75%,
    var(--color-accent-light) 100%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradient-shift 5s ease-in-out infinite;
}

@keyframes gradient-shift {
  0%, 100% { background-position: 0% center; }
  50%      { background-position: 200% center; }
}

.hero__subtitle {
  font-size: var(--fs-lg);
  font-weight: var(--fw-light);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  max-width: 600px;
  margin-inline: auto;
  line-height: var(--lh-relaxed);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
}

.hero__scroll-hint {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-base);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
  animation: bounce-subtle 2.5s ease-in-out infinite;
}

.hero__scroll-hint svg,
.hero__scroll-hint .arrow {
  animation: bounce-subtle 2.5s ease-in-out infinite;
}

/* Floating decorative elements */
.hero__decoration {
  position: absolute;
  pointer-events: none;
  opacity: 0.08;
  font-size: 4rem;
  animation: float 8s ease-in-out infinite;
}

.hero__decoration:nth-child(1) { top: 15%; left: 8%;  animation-delay: 0s; }
.hero__decoration:nth-child(2) { top: 25%; right: 10%; animation-delay: 2s; }
.hero__decoration:nth-child(3) { bottom: 20%; left: 15%; animation-delay: 4s; }

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50%      { transform: translateY(-20px) rotate(5deg); }
}

/* ------------------------------------------------------------
   8. SECTIONS
   ------------------------------------------------------------ */
.section {
  padding: var(--space-4xl) var(--space-lg);
  position: relative;
}

.section--alt {
  background: var(--color-bg-dark);
}

.section--elevated {
  background: var(--color-bg-card);
}

.section--gradient {
  background:
    radial-gradient(ellipse 70% 50% at 30% 50%, rgba(232, 168, 56, 0.04), transparent),
    var(--color-bg-deepest);
}

.section__header {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: var(--space-3xl);
}

.section__overline {
  display: block;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section__title {
  margin-bottom: var(--space-md);
}

.section__description {
  font-size: var(--fs-md);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

/* Alternating section edge decoration */
.section--alt::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(232, 168, 56, 0.15) 20%,
    rgba(244, 114, 182, 0.15) 50%,
    rgba(168, 85, 247, 0.15) 80%,
    transparent
  );
}

/* ------------------------------------------------------------
   9. STAGE CARDS
   ------------------------------------------------------------ */
.stage-card {
  position: relative;
  background: var(--color-bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border-left: 4px solid var(--color-text-muted);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    background var(--transition-fast);
  overflow: hidden;
}

.stage-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: 80px;
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.stage-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  background: var(--color-bg-card-hover);
}

.stage-card:hover::before {
  opacity: 1;
}

/* --- Stage-specific colours --- */
.stage-card--1 { border-left-color: var(--stage-1); }
.stage-card--2 { border-left-color: var(--stage-2); }
.stage-card--3 { border-left-color: var(--stage-3); }
.stage-card--4 { border-left-color: var(--stage-4); }
.stage-card--5 { border-left-color: var(--stage-5); }
.stage-card--6 { border-left-color: var(--stage-6); }
.stage-card--7 { border-left-color: var(--stage-7); }

.stage-card--1::before { background: linear-gradient(90deg, rgba(74,222,128,0.08), transparent); }
.stage-card--2::before { background: linear-gradient(90deg, rgba(56,189,248,0.08), transparent); }
.stage-card--3::before { background: linear-gradient(90deg, rgba(167,139,250,0.08), transparent); }
.stage-card--4::before { background: linear-gradient(90deg, rgba(232,168,56,0.08), transparent); }
.stage-card--5::before { background: linear-gradient(90deg, rgba(244,114,182,0.08), transparent); }
.stage-card--6::before { background: linear-gradient(90deg, rgba(239,68,68,0.08), transparent); }
.stage-card--7::before { background: linear-gradient(90deg, rgba(251,191,36,0.08), transparent); }

.stage-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-md);
}

.stage-card--1 .stage-card__number { background: rgba(74,222,128,0.15);  color: var(--stage-1); }
.stage-card--2 .stage-card__number { background: rgba(56,189,248,0.15);  color: var(--stage-2); }
.stage-card--3 .stage-card__number { background: rgba(167,139,250,0.15); color: var(--stage-3); }
.stage-card--4 .stage-card__number { background: rgba(232,168,56,0.15);  color: var(--stage-4); }
.stage-card--5 .stage-card__number { background: rgba(244,114,182,0.15); color: var(--stage-5); }
.stage-card--6 .stage-card__number { background: rgba(239,68,68,0.15);   color: var(--stage-6); }
.stage-card--7 .stage-card__number { background: rgba(251,191,36,0.15);  color: var(--stage-7); }

.stage-card__title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-xs);
}

.stage-card__subtitle {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.stage-card__description {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  margin-bottom: var(--space-lg);
}

.stage-card__lessons {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

/* Stage cards grid */
.stages-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .stages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .stages-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  /* Let the last card span if odd number */
  .stages-grid .stage-card:last-child:nth-child(3n - 1) {
    grid-column: span 1;
  }
}

/* ------------------------------------------------------------
   10. LESSON CARDS
   ------------------------------------------------------------ */
.lesson-grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .lesson-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .lesson-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.lesson-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-fast);
  cursor: pointer;
}

.lesson-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(232, 168, 56, 0.2);
}

.lesson-card__icon {
  font-size: 1.8rem;
  margin-bottom: var(--space-md);
}

.lesson-card__title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-xs);
  transition: color var(--transition-fast);
}

.lesson-card:hover .lesson-card__title {
  color: var(--color-accent-light);
}

.lesson-card__description {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
  flex-grow: 1;
  margin-bottom: var(--space-md);
}

.lesson-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.lesson-card__duration {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
}

.lesson-card__link {
  position: absolute;
  inset: 0;
  z-index: var(--z-base);
}

/* ------------------------------------------------------------
   11. CTA BUTTONS
   ------------------------------------------------------------ */
.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-xl);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  line-height: 1;
  color: var(--color-bg-deepest);
  background: linear-gradient(135deg, var(--color-accent-light), var(--color-accent));
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition:
    transform var(--transition-fast),
    box-shadow var(--transition-base),
    filter var(--transition-fast);
}

.cta-button:hover {
  color: var(--color-bg-deepest);
  transform: translateY(-2px) scale(1.03);
  box-shadow: var(--glow-accent);
  filter: brightness(1.1);
}

.cta-button:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
}

.cta-button:focus-visible {
  outline: 2px solid var(--color-accent-light);
  outline-offset: 4px;
}

/* Large variant */
.cta-button--lg {
  padding: var(--space-md) var(--space-2xl);
  font-size: var(--fs-md);
}

/* Ghost / outline variant */
.cta-button--ghost {
  background: transparent;
  color: var(--color-text-primary);
  border: 1.5px solid rgba(255, 255, 255, 0.15);
}

.cta-button--ghost:hover {
  color: var(--color-text-primary);
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: none;
  filter: none;
}

/* Funky gradient variant */
.cta-button--funky {
  background: var(--gradient-funky);
  color: #fff;
}

.cta-button--funky:hover {
  color: #fff;
  box-shadow: var(--glow-pink);
}

/* Small variant */
.cta-button--sm {
  padding: var(--space-2xs) var(--space-md);
  font-size: var(--fs-sm);
}

/* ------------------------------------------------------------
   12. FEATURE GRID
   ------------------------------------------------------------ */
.feature-grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.feature-card {
  text-align: center;
  padding: var(--space-2xl) var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-lg);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  margin-bottom: var(--space-lg);
  font-size: 1.8rem;
  border-radius: var(--radius-lg);
  background: rgba(232, 168, 56, 0.1);
}

.feature-card__icon--pink {
  background: rgba(244, 114, 182, 0.1);
}

.feature-card__icon--purple {
  background: rgba(168, 85, 247, 0.1);
}

.feature-card__icon--green {
  background: rgba(74, 222, 128, 0.1);
}

.feature-card__title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-sm);
}

.feature-card__text {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

/* ------------------------------------------------------------
   14. TAB DISPLAY (Guitar Tablature)
   ------------------------------------------------------------ */
.tab-display {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-lg) var(--space-xl);
  margin: var(--space-lg) 0;
  overflow-x: auto;
  position: relative;
}

.tab-display::before {
  content: 'TAB';
  position: absolute;
  top: var(--space-sm);
  right: var(--space-md);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  color: var(--color-accent);
  opacity: 0.5;
  letter-spacing: 0.1em;
}

.tab-display pre,
.tab-display code {
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 0.7rem + 0.3vw, 0.95rem);
  line-height: 1.5;
  color: var(--color-text-primary);
  white-space: pre;
  tab-size: 4;
}

.tab-display__title {
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-accent-light);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.tab-display__strings {
  color: var(--color-text-muted);
}

.tab-display__notes {
  color: var(--color-accent-light);
}

/* Highlighted fret numbers */
.tab-display .fret-highlight {
  color: var(--color-pink);
  font-weight: var(--fw-bold);
}

/* Scrollbar for wide tabs */
.tab-display::-webkit-scrollbar {
  height: 6px;
}

.tab-display::-webkit-scrollbar-thumb {
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
}

/* ------------------------------------------------------------
   15. LEVEL BADGES
   ------------------------------------------------------------ */
.level-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 2px var(--space-sm);
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.03em;
  border-radius: var(--radius-full);
  line-height: 1.7;
  white-space: nowrap;
}

.level-badge--beginner {
  background: rgba(74, 222, 128, 0.12);
  color: var(--stage-1);
  border: 1px solid rgba(74, 222, 128, 0.2);
}

.level-badge--intermediate {
  background: rgba(232, 168, 56, 0.12);
  color: var(--color-accent-light);
  border: 1px solid rgba(232, 168, 56, 0.2);
}

.level-badge--advanced {
  background: rgba(239, 68, 68, 0.12);
  color: var(--stage-6);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.level-badge--expert {
  background: rgba(251, 191, 36, 0.12);
  color: var(--stage-7);
  border: 1px solid rgba(251, 191, 36, 0.2);
}

/* Dot indicator variant */
.level-badge__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: currentColor;
}

/* ------------------------------------------------------------
   16. FUNKY DIVIDER
   ------------------------------------------------------------ */
.funky-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg) 0;
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  user-select: none;
}

.funky-divider::before,
.funky-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(232, 168, 56, 0.2) 30%,
    rgba(244, 114, 182, 0.2) 50%,
    rgba(168, 85, 247, 0.2) 70%,
    transparent
  );
}

.funky-divider__notes {
  display: flex;
  gap: var(--space-xs);
  opacity: 0.4;
  animation: strum-wave 3s ease-in-out infinite;
}

.funky-divider__notes span {
  display: inline-block;
  font-size: 1rem;
}

.funky-divider__notes span:nth-child(1) { animation: strum-wave 3s ease-in-out 0s infinite; }
.funky-divider__notes span:nth-child(2) { animation: strum-wave 3s ease-in-out 0.15s infinite; }
.funky-divider__notes span:nth-child(3) { animation: strum-wave 3s ease-in-out 0.3s infinite; }
.funky-divider__notes span:nth-child(4) { animation: strum-wave 3s ease-in-out 0.45s infinite; }
.funky-divider__notes span:nth-child(5) { animation: strum-wave 3s ease-in-out 0.6s infinite; }

/* Variant: simple line */
.funky-divider--simple {
  padding: var(--space-md) 0;
}

.funky-divider--simple::before,
.funky-divider--simple::after {
  background: rgba(255, 255, 255, 0.06);
}

/* ------------------------------------------------------------
   17. SITE FOOTER
   ------------------------------------------------------------ */
.site-footer {
  position: relative;
  background: var(--color-bg-dark);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding: var(--space-4xl) var(--space-lg) var(--space-xl);
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(232, 168, 56, 0.3),
    rgba(244, 114, 182, 0.3),
    rgba(168, 85, 247, 0.3),
    transparent
  );
}

.site-footer__grid {
  display: grid;
  gap: var(--space-2xl);
  grid-template-columns: 1fr;
  max-width: var(--max-width);
  margin-inline: auto;
  margin-bottom: var(--space-3xl);
}

@media (min-width: 640px) {
  .site-footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .site-footer__grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

.site-footer__brand {
  max-width: 320px;
}

.site-footer__brand .site-logo {
  margin-bottom: var(--space-md);
}

.site-footer__brand p {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  line-height: var(--lh-relaxed);
}

.site-footer__heading {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.site-footer__links a {
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.site-footer__links a:hover {
  color: var(--color-accent-light);
  padding-left: var(--space-xs);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--max-width);
  margin-inline: auto;
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.site-footer__copy {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.site-footer__socials {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.site-footer__socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.04);
  font-size: 1rem;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.site-footer__socials a:hover {
  color: var(--color-accent-light);
  background: rgba(232, 168, 56, 0.12);
  transform: translateY(-2px);
}

/* ------------------------------------------------------------
   18. BREADCRUMB
   ------------------------------------------------------------ */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-md) 0;
  font-size: var(--fs-sm);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  color: var(--color-text-muted);
}

.breadcrumb__item a {
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.breadcrumb__item a:hover {
  color: var(--color-accent-light);
}

.breadcrumb__separator {
  color: var(--color-text-muted);
  opacity: 0.4;
  font-size: 0.7em;
  margin: 0 var(--space-2xs);
}

.breadcrumb__item:last-child {
  color: var(--color-text-secondary);
  font-weight: var(--fw-medium);
}

/* Structured data support */
.breadcrumb[itemscope] .breadcrumb__item[itemprop="itemListElement"] {
  /* no visual change, just for markup clarity */
}

/* ------------------------------------------------------------
   19. LESSON CONTENT
   ------------------------------------------------------------ */
.lesson-content {
  max-width: var(--max-width-narrow);
  margin-inline: auto;
  padding: var(--space-2xl) var(--space-lg);
}

.lesson-content > * + * {
  margin-top: var(--space-lg);
}

.lesson-content h1 {
  font-size: var(--fs-2xl);
  margin-bottom: var(--space-md);
}

.lesson-content h2 {
  font-size: var(--fs-xl);
  margin-top: var(--space-3xl);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.lesson-content h3 {
  font-size: var(--fs-lg);
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-sm);
}

.lesson-content h4 {
  font-size: var(--fs-md);
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.lesson-content p {
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

.lesson-content p + p {
  margin-top: var(--space-md);
}

.lesson-content strong {
  color: var(--color-text-primary);
  font-weight: var(--fw-semibold);
}

.lesson-content em {
  color: var(--color-accent-light);
  font-style: italic;
}

.lesson-content a {
  color: var(--color-accent-light);
  text-decoration: underline;
  text-decoration-color: rgba(232, 168, 56, 0.3);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--transition-fast), color var(--transition-fast);
}

.lesson-content a:hover {
  text-decoration-color: var(--color-accent);
}

.lesson-content ul,
.lesson-content ol {
  padding-left: var(--space-xl);
  color: var(--color-text-secondary);
}

.lesson-content ul {
  list-style: none;
}

.lesson-content ul li {
  position: relative;
  padding-left: var(--space-md);
  margin-bottom: var(--space-xs);
  line-height: var(--lh-relaxed);
}

.lesson-content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
}

.lesson-content ol {
  list-style: none;
  counter-reset: lesson-list;
}

.lesson-content ol li {
  position: relative;
  padding-left: var(--space-lg);
  margin-bottom: var(--space-sm);
  line-height: var(--lh-relaxed);
  counter-increment: lesson-list;
}

.lesson-content ol li::before {
  content: counter(lesson-list);
  position: absolute;
  left: 0;
  top: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  color: var(--color-accent);
  background: rgba(232, 168, 56, 0.1);
  border-radius: var(--radius-full);
}

.lesson-content blockquote {
  padding: var(--space-md) var(--space-xl);
  border-left: 3px solid var(--color-accent);
  background: rgba(232, 168, 56, 0.05);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.lesson-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  padding: 2px 6px;
  background: var(--color-bg-card);
  border-radius: var(--radius-sm);
  color: var(--color-pink);
}

.lesson-content pre {
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  overflow-x: auto;
}

.lesson-content pre code {
  padding: 0;
  background: none;
  color: var(--color-text-primary);
  font-size: var(--fs-sm);
}

.lesson-content img {
  border-radius: var(--radius-lg);
  margin: var(--space-xl) 0;
  box-shadow: var(--shadow-md);
}

.lesson-content hr {
  border: none;
  height: 1px;
  background: rgba(255, 255, 255, 0.06);
  margin: var(--space-2xl) 0;
}

/* Tip / Note callout boxes inside lessons */
.lesson-content .tip,
.lesson-content .note,
.lesson-content .warning {
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-md);
  margin: var(--space-lg) 0;
  font-size: var(--fs-sm);
  line-height: var(--lh-relaxed);
}

.lesson-content .tip {
  background: rgba(74, 222, 128, 0.06);
  border-left: 3px solid var(--color-success);
  color: var(--color-text-secondary);
}

.lesson-content .note {
  background: rgba(56, 189, 248, 0.06);
  border-left: 3px solid var(--color-info);
  color: var(--color-text-secondary);
}

.lesson-content .warning {
  background: rgba(239, 68, 68, 0.06);
  border-left: 3px solid var(--color-danger);
  color: var(--color-text-secondary);
}

/* ------------------------------------------------------------
   20. CHORD DIAGRAM
   ------------------------------------------------------------ */
.chord-diagram {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  min-width: 150px;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.chord-diagram:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.chord-diagram__name {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  color: var(--color-accent-light);
  margin-bottom: var(--space-sm);
}

.chord-diagram__grid {
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  line-height: 1.4;
  color: var(--color-text-secondary);
  white-space: pre;
  margin-bottom: var(--space-sm);
}

.chord-diagram__fingering {
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.12em;
}

.chord-diagram__image {
  width: 100%;
  max-width: 140px;
  margin-bottom: var(--space-sm);
}

.chord-diagram__image svg {
  width: 100%;
  height: auto;
}

/* Grid layout for multiple chord diagrams */
.chord-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  justify-content: center;
  margin: var(--space-xl) 0;
}

/* Variation: compact chord box for inline use */
.chord-diagram--compact {
  padding: var(--space-sm) var(--space-md);
  min-width: auto;
}

.chord-diagram--compact .chord-diagram__name {
  font-size: var(--fs-base);
  margin-bottom: var(--space-2xs);
}

/* ------------------------------------------------------------
   21. EXERCISE LIST
   ------------------------------------------------------------ */
.exercise-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin: var(--space-xl) 0;
}

.exercise-list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.exercise-list__item:hover {
  border-color: rgba(232, 168, 56, 0.15);
  background: var(--color-bg-card-hover);
}

.exercise-list__marker {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  font-size: var(--fs-sm);
  font-weight: var(--fw-bold);
  color: var(--color-accent);
  background: rgba(232, 168, 56, 0.1);
  border-radius: var(--radius-full);
}

.exercise-list__marker--check {
  color: var(--color-success);
  background: rgba(74, 222, 128, 0.1);
}

.exercise-list__marker--star {
  color: var(--color-warning);
  background: rgba(251, 191, 36, 0.1);
}

.exercise-list__content {
  flex: 1;
  min-width: 0;
}

.exercise-list__title {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  margin-bottom: var(--space-2xs);
}

.exercise-list__text {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

.exercise-list__meta {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

/* Tip list variant */
.tip-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin: var(--space-lg) 0;
}

.tip-list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  line-height: var(--lh-relaxed);
}

.tip-list__item::before {
  content: '';
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-top: 3px;
  border-radius: var(--radius-full);
  background: rgba(74, 222, 128, 0.15);
  border: 2px solid var(--color-success);
}

/* ------------------------------------------------------------
   22. ANIMATIONS / KEYFRAMES
   ------------------------------------------------------------ */
@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(232, 168, 56, 0);
  }
  50% {
    box-shadow: 0 0 20px 2px rgba(232, 168, 56, 0.15);
  }
}

@keyframes slide-in {
  from {
    opacity: 0;
    transform: translateX(-24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slide-in-right {
  from {
    opacity: 0;
    transform: translateX(24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes bounce-subtle {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

@keyframes strum-wave {
  0%, 100% {
    transform: translateY(0) rotate(0deg);
    opacity: 0.4;
  }
  25% {
    transform: translateY(-4px) rotate(-5deg);
    opacity: 0.7;
  }
  50% {
    transform: translateY(0) rotate(0deg);
    opacity: 0.4;
  }
  75% {
    transform: translateY(2px) rotate(3deg);
    opacity: 0.5;
  }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes shimmer {
  from {
    background-position: -200% center;
  }
  to {
    background-position: 200% center;
  }
}

/* Utility classes for scroll-triggered animations */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slower), transform var(--transition-slower);
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll:nth-child(2) { transition-delay: 80ms; }
.animate-on-scroll:nth-child(3) { transition-delay: 160ms; }
.animate-on-scroll:nth-child(4) { transition-delay: 240ms; }
.animate-on-scroll:nth-child(5) { transition-delay: 320ms; }
.animate-on-scroll:nth-child(6) { transition-delay: 400ms; }
.animate-on-scroll:nth-child(7) { transition-delay: 480ms; }

/* Stagger for grid children */
.stagger-children > *:nth-child(1) { animation-delay: 0ms; }
.stagger-children > *:nth-child(2) { animation-delay: 60ms; }
.stagger-children > *:nth-child(3) { animation-delay: 120ms; }
.stagger-children > *:nth-child(4) { animation-delay: 180ms; }
.stagger-children > *:nth-child(5) { animation-delay: 240ms; }
.stagger-children > *:nth-child(6) { animation-delay: 300ms; }
.stagger-children > *:nth-child(7) { animation-delay: 360ms; }
.stagger-children > *:nth-child(8) { animation-delay: 420ms; }
.stagger-children > *:nth-child(9) { animation-delay: 480ms; }

/* Respect motion preferences */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ------------------------------------------------------------
   23. PROGRESS / LOADING STATES
   ------------------------------------------------------------ */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-card) 0%,
    var(--color-bg-elevated) 50%,
    var(--color-bg-card) 100%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton--text {
  height: 1em;
  width: 80%;
  margin-bottom: var(--space-xs);
}

.skeleton--title {
  height: 1.5em;
  width: 60%;
  margin-bottom: var(--space-md);
}

.skeleton--card {
  height: 200px;
  width: 100%;
}

/* Progress bar for lesson progress */
.progress-bar {
  width: 100%;
  height: 6px;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  border-radius: var(--radius-full);
  transition: width var(--transition-slow);
}

.progress-bar__fill--funky {
  background: var(--gradient-funky);
}

/* ------------------------------------------------------------
   24. SEARCH BAR
   ------------------------------------------------------------ */
.search-bar {
  position: relative;
  max-width: 480px;
  width: 100%;
}

.search-bar__input {
  width: 100%;
  padding: var(--space-sm) var(--space-lg);
  padding-left: 44px;
  font-size: var(--fs-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-input);
  border: 1.5px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.search-bar__input::placeholder {
  color: var(--color-text-muted);
}

.search-bar__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(232, 168, 56, 0.12);
}

.search-bar__icon {
  position: absolute;
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-muted);
  font-size: 1rem;
  pointer-events: none;
}

/* ------------------------------------------------------------
   25. PAGINATION
   ------------------------------------------------------------ */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2xs);
  padding: var(--space-xl) 0;
}

.pagination__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-sm);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.pagination__link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-card-hover);
  border-color: rgba(255, 255, 255, 0.12);
}

.pagination__link.active {
  color: var(--color-bg-deepest);
  background: var(--color-accent);
  border-color: var(--color-accent);
  font-weight: var(--fw-bold);
}

/* ------------------------------------------------------------
   26. TABLE OF CONTENTS (Lesson Sidebar)
   ------------------------------------------------------------ */
.toc {
  position: sticky;
  top: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-lg);
}

.toc__title {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
}

.toc__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.toc__link {
  display: block;
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.toc__link:hover {
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.03);
}

.toc__link.active {
  color: var(--color-accent-light);
  border-left-color: var(--color-accent);
  background: rgba(232, 168, 56, 0.05);
}

.toc__link--sub {
  padding-left: var(--space-lg);
  font-size: var(--fs-xs);
}

/* ------------------------------------------------------------
   27. TAGS / TOPIC PILLS
   ------------------------------------------------------------ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: 2px var(--space-sm);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-full);
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.tag:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--color-text-primary);
}

.tag--accent {
  background: rgba(232, 168, 56, 0.12);
  color: var(--color-accent-light);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

/* ------------------------------------------------------------
   28. BACK-TO-TOP
   ------------------------------------------------------------ */
.back-to-top {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  color: var(--color-text-secondary);
  font-size: 1.2rem;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition:
    opacity var(--transition-base),
    visibility var(--transition-base),
    transform var(--transition-base),
    background var(--transition-fast),
    color var(--transition-fast);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  color: var(--color-bg-deepest);
  border-color: var(--color-accent);
}

/* ------------------------------------------------------------
   29. COOKIE BANNER
   ------------------------------------------------------------ */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-modal);
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-bg-card);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.4);
  transform: translateY(100%);
  transition: transform var(--transition-slow);
}

.cookie-banner.is-visible {
  transform: translateY(0);
}

.cookie-banner__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--max-width);
  margin-inline: auto;
}

.cookie-banner__text {
  font-size: var(--fs-sm);
  color: var(--color-text-secondary);
  flex: 1;
  min-width: 250px;
}

.cookie-banner__actions {
  display: flex;
  gap: var(--space-sm);
}

/* ------------------------------------------------------------
   30. RESPONSIVE HELPERS
   ------------------------------------------------------------ */
.hide-mobile  { display: none !important; }
.hide-desktop { display: block !important; }

@media (min-width: 768px) {
  .hide-mobile  { display: block !important; }
  .hide-desktop { display: none !important; }
}

/* Page top spacer (legacy) */
.page-offset {
  padding-top: 0;
}

/* Two-column lesson layout */
.lesson-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
  max-width: var(--max-width);
  margin-inline: auto;
  padding: var(--space-xl) var(--space-lg);
}

@media (min-width: 1024px) {
  .lesson-layout {
    grid-template-columns: 1fr var(--sidebar-width);
  }
}

/* Wide container override */
@media (min-width: 1440px) {
  .container--wide {
    max-width: 1440px;
  }
}

/* ------------------------------------------------------------
   31. VIDEO EMBED
   ------------------------------------------------------------ */
.video-embed {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 */
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-card);
  margin: var(--space-xl) 0;
  box-shadow: var(--shadow-lg);
}

.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ------------------------------------------------------------
   32. STRUMMING PATTERN DISPLAY
   ------------------------------------------------------------ */
.strum-pattern {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  margin: var(--space-md) 0;
  overflow-x: auto;
  font-family: var(--font-mono);
}

.strum-pattern__beat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xs);
  min-width: 36px;
  text-align: center;
}

.strum-pattern__count {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
}

.strum-pattern__direction {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
}

.strum-pattern__direction--down {
  color: var(--color-accent-light);
}

.strum-pattern__direction--up {
  color: var(--color-pink);
}

.strum-pattern__direction--mute {
  color: var(--color-text-muted);
}

/* ------------------------------------------------------------
   33. NEWSLETTER / SIGNUP FORM
   ------------------------------------------------------------ */
.signup-form {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  max-width: 480px;
  margin: var(--space-lg) 0;
}

.signup-form__input {
  flex: 1;
  min-width: 200px;
  padding: var(--space-sm) var(--space-lg);
  font-size: var(--fs-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-input);
  border: 1.5px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.signup-form__input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(232, 168, 56, 0.12);
}

.signup-form__input::placeholder {
  color: var(--color-text-muted);
}

/* ------------------------------------------------------------
   34. RELATED LESSONS / NEXT LESSON
   ------------------------------------------------------------ */
.related-lessons {
  margin-top: var(--space-3xl);
  padding-top: var(--space-2xl);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.related-lessons__title {
  font-size: var(--fs-lg);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-lg);
}

.next-lesson {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding: var(--space-lg) var(--space-xl);
  background: var(--color-bg-card);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast), box-shadow var(--transition-base);
  text-decoration: none;
  margin-top: var(--space-xl);
}

.next-lesson:hover {
  border-color: rgba(232, 168, 56, 0.2);
  box-shadow: var(--shadow-md);
}

.next-lesson__label {
  font-size: var(--fs-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  margin-bottom: var(--space-2xs);
}

.next-lesson__title {
  font-size: var(--fs-md);
  font-weight: var(--fw-semibold);
  color: var(--color-text-primary);
}

.next-lesson__arrow {
  font-size: 1.5rem;
  color: var(--color-accent);
  transition: transform var(--transition-fast);
}

.next-lesson:hover .next-lesson__arrow {
  transform: translateX(4px);
}

/* ------------------------------------------------------------
   35. FORM ELEMENTS (General)
   ------------------------------------------------------------ */
input[type="text"],
input[type="email"],
input[type="search"],
textarea,
select {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-sm);
  color: var(--color-text-primary);
  background: var(--color-bg-input);
  border: 1.5px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(232, 168, 56, 0.12);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a1a1aa' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}

/* Checkbox & Radio custom styling */
input[type="checkbox"],
input[type="radio"] {
  appearance: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.15);
  background: var(--color-bg-input);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
  vertical-align: middle;
}

input[type="checkbox"] {
  border-radius: var(--radius-sm);
}

input[type="radio"] {
  border-radius: var(--radius-full);
}

input[type="checkbox"]:checked,
input[type="radio"]:checked {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

input[type="checkbox"]:checked::after {
  content: '';
  display: block;
  width: 5px;
  height: 9px;
  margin: 1px auto;
  border: 2px solid var(--color-bg-deepest);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

input[type="radio"]:checked::after {
  content: '';
  display: block;
  width: 8px;
  height: 8px;
  margin: 3px auto;
  background: var(--color-bg-deepest);
  border-radius: var(--radius-full);
}

label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  cursor: pointer;
}

/* ------------------------------------------------------------
   36. NOTIFICATION / TOAST
   ------------------------------------------------------------ */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-bg-elevated);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xl);
  font-size: var(--fs-sm);
  color: var(--color-text-primary);
  opacity: 0;
  transition: transform var(--transition-slow), opacity var(--transition-base);
}

.toast.is-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast--success {
  border-color: rgba(74, 222, 128, 0.2);
}

.toast--error {
  border-color: rgba(239, 68, 68, 0.2);
}

/* ------------------------------------------------------------
   37. PRINT STYLES
   ------------------------------------------------------------ */
@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  .site-header,
  .site-footer,
  .nav-mobile,
  .nav-mobile__overlay,
  .hamburger,
  .back-to-top,
  .cookie-banner,
  .cta-button,
  .hero__scroll-hint,
  .search-bar,
  .toast,
  .video-embed {
    display: none !important;
  }

  .hero {
    min-height: auto;
    padding: 2cm 0 1cm;
  }

  .hero__title-gradient {
    -webkit-text-fill-color: #000 !important;
    background: none !important;
  }

  .section {
    padding: 1cm 0;
    page-break-inside: avoid;
  }

  a {
    text-decoration: underline;
  }

  a[href]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    color: #555;
  }

  a[href^="#"]::after,
  a[href^="javascript"]::after {
    content: "";
  }

  .lesson-content {
    max-width: 100%;
    padding: 0;
  }

  .lesson-content h2,
  .lesson-content h3 {
    page-break-after: avoid;
  }

  .chord-diagram,
  .tab-display {
    page-break-inside: avoid;
    border: 1px solid #ccc;
  }

  .tab-display pre {
    white-space: pre-wrap;
  }

  img {
    max-width: 100% !important;
    page-break-inside: avoid;
  }

  .stage-card,
  .lesson-card,
  .feature-card {
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  .page-offset {
    padding-top: 0;
  }
}

/* ------------------------------------------------------------
   38. DARK MODE FINE-TUNING
   (For future light-mode toggle support)
   ------------------------------------------------------------ */
@media (prefers-color-scheme: light) {
  /* Placeholder: site is dark-first, but these variables
     can be overridden when a .light-theme class is toggled. */
}

.light-theme {
  --color-bg-deepest:     #f7f7f8;
  --color-bg-dark:        #ffffff;
  --color-bg-card:        #ffffff;
  --color-bg-card-hover:  #f0f0f4;
  --color-bg-elevated:    #e8e8ec;
  --color-bg-input:       #f3f3f5;
  --color-text-primary:   #111111;
  --color-text-secondary: #555566;
  --color-text-muted:     #8888999;
  --color-accent-glow:    rgba(232, 168, 56, 0.2);
  --shadow-sm:    0 1px 3px rgba(0,0,0,0.08);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg:    0 8px 30px rgba(0,0,0,0.12);
}

/* ============================================================
   END OF STYLESHEET
   ============================================================ */