/* ─────────────────────────────────────────────────────────────────
   iLearnIt — landing site styles.
   Design tokens deliberately mirror the Flutter app's AppColors so
   the brand reads the same in both surfaces.
   ───────────────────────────────────────────────────────────────── */

:root {
  /* Brand */
  --c-primary: #6c5ce7;
  --c-primary-dark: #4c3fba;
  --c-accent: #e8b931;

  /* Instruments */
  --c-guitar: #d2691e;
  --c-piano: #1f2937;
  --c-violin: #b22222;

  /* Surfaces (light) */
  --c-bg: #f7f7fb;
  --c-surface: #ffffff;
  --c-border: #e5e7eb;
  --c-text: #111827;
  --c-text-2: #6b7280;

  /* Status */
  --c-success: #22c55e;
  --c-warning: #f59e0b;
  --c-error: #ef4444;

  /* Layout */
  --maxw: 1180px;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-1: 0 2px 8px rgba(17, 24, 39, 0.04);
  --shadow-2: 0 14px 48px rgba(76, 63, 186, 0.16);

  /* Type */
  --fs-display: clamp(2.25rem, 4.5vw, 3.75rem);
  --fs-h1: clamp(1.75rem, 3vw, 2.5rem);
  --fs-h2: clamp(1.4rem, 2.4vw, 2rem);
  --fs-h3: 1.25rem;
  --fs-body: 1rem;
  --fs-small: 0.875rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --c-bg: #0e0f1a;
    --c-surface: #181a2c;
    --c-border: #2a2d44;
    --c-text: #f5f5f7;
    --c-text-2: #a0a3b8;
    --shadow-1: 0 2px 8px rgba(0, 0, 0, 0.35);
    --shadow-2: 0 14px 48px rgba(0, 0, 0, 0.55);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font: 400 var(--fs-body)/1.6 'Inter', system-ui, -apple-system,
        Segoe UI, Roboto, 'Helvetica Neue', Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg { max-width: 100%; display: block; }
a { color: var(--c-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--maxw);
  padding: 0 24px;
  margin: 0 auto;
}

/* ── Header / Nav ─────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(180%) blur(12px);
  background: color-mix(in srgb, var(--c-bg) 75%, transparent);
  border-bottom: 1px solid var(--c-border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.125rem;
  color: var(--c-text);
}
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
  color: white;
  font-weight: 800;
}

.nav-links {
  display: flex;
  gap: 24px;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--c-text-2);
  font-weight: 500;
  font-size: 0.95rem;
}
.nav-links a:hover { color: var(--c-text); text-decoration: none; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 12px;
  background: var(--c-primary);
  color: white !important;
  font-weight: 600;
}
.nav-cta:hover { background: var(--c-primary-dark); text-decoration: none; }

.nav-toggle {
  display: none;
  background: transparent;
  border: 0;
  cursor: pointer;
  padding: 8px;
  color: var(--c-text);
}

@media (max-width: 820px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    padding: 8px 0;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links a, .nav-cta {
    width: 100%;
    padding: 14px 24px;
    border-radius: 0;
  }
  .nav-cta { background: transparent; color: var(--c-primary) !important; }
}

/* ── Hero ─────────────────────────────────────────────────────── */
.hero {
  padding: 80px 0 64px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: -40% 30% auto -10%;
  height: 600px;
  background:
    radial-gradient(closest-side, color-mix(in srgb, var(--c-primary) 35%, transparent), transparent 80%),
    radial-gradient(closest-side, color-mix(in srgb, var(--c-accent) 22%, transparent), transparent 80%);
  filter: blur(40px);
  z-index: -1;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 900px) { .hero-grid { grid-template-columns: 1fr; gap: 32px; } }

.eyebrow {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--c-primary) 12%, transparent);
  color: var(--c-primary);
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 20px;
}
.hero h1 {
  font-size: var(--fs-display);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
  font-weight: 800;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero p.lead {
  font-size: 1.125rem;
  color: var(--c-text-2);
  margin: 0 0 28px;
  max-width: 540px;
}
.hero-ctas { display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 22px;
  border-radius: 14px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.08s ease, background 0.12s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--c-primary);
  color: white;
}
.btn-primary:hover { background: var(--c-primary-dark); text-decoration: none; }
.btn-ghost {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-border);
}
.btn-ghost:hover { background: var(--c-surface); text-decoration: none; }

.store-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.store-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: 12px;
  background: var(--c-text);
  color: var(--c-bg);
  font-weight: 600;
}
.store-badge small { display: block; font-size: 0.7rem; opacity: 0.7; font-weight: 500; }
.store-badge:hover { text-decoration: none; opacity: 0.92; }

/* Hero visual */
.hero-visual {
  position: relative;
  aspect-ratio: 4/5;
  max-width: 420px;
  margin-left: auto;
  border-radius: 24px;
  background:
    linear-gradient(160deg, var(--c-primary), var(--c-primary-dark));
  box-shadow: var(--shadow-2);
  overflow: hidden;
  display: grid;
  place-items: center;
}
.hero-visual::after {
  content: '';
  position: absolute;
  inset: auto -20% -30% -20%;
  height: 60%;
  background: radial-gradient(closest-side, rgba(232, 185, 49, 0.45), transparent);
  filter: blur(20px);
}
.hero-visual .musical-glyph {
  position: relative;
  font-size: 8rem;
  color: rgba(255, 255, 255, 0.92);
  line-height: 1;
  text-shadow: 0 24px 40px rgba(0, 0, 0, 0.28);
}

/* ── Sections ─────────────────────────────────────────────────── */
section { padding: 72px 0; }
section h2 {
  font-size: var(--fs-h1);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
section p.sub {
  color: var(--c-text-2);
  max-width: 620px;
  margin: 0 auto 40px;
  text-align: center;
}
.section-head { text-align: center; margin-bottom: 40px; }

/* ── Instrument cards ─────────────────────────────────────────── */
.instruments {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 760px) { .instruments { grid-template-columns: 1fr; } }
.instrument-card {
  border-radius: var(--radius);
  padding: 32px;
  color: white;
  position: relative;
  overflow: hidden;
  isolation: isolate;
  min-height: 220px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.instrument-card.guitar { background: linear-gradient(140deg, #b35b1c, #d2691e); }
.instrument-card.piano  { background: linear-gradient(140deg, #0f172a, #334155); }
.instrument-card.violin { background: linear-gradient(140deg, #7f1d1d, #b22222); }
.instrument-card h3 {
  margin: 0 0 6px;
  font-size: 1.5rem;
  font-weight: 700;
}
.instrument-card p { margin: 0; opacity: 0.85; }
.instrument-card svg {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  opacity: 0.35;
}

/* ── Feature grid ─────────────────────────────────────────────── */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 880px) { .features { grid-template-columns: 1fr; } }
.feature {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-1);
}
.feature .icon {
  width: 44px; height: 44px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--c-primary) 12%, transparent);
  color: var(--c-primary);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  font-size: 1.4rem;
}
.feature h3 { margin: 0 0 6px; font-size: 1.125rem; }
.feature p { margin: 0; color: var(--c-text-2); }

/* ── Pricing tiers ────────────────────────────────────────────── */
.pricing {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
@media (max-width: 880px) { .pricing { grid-template-columns: 1fr; } }
.tier {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px;
  position: relative;
}
.tier.featured {
  border-color: var(--c-primary);
  box-shadow: 0 10px 40px color-mix(in srgb, var(--c-primary) 18%, transparent);
}
.tier .ribbon {
  position: absolute;
  top: -12px;
  right: 20px;
  background: var(--c-primary);
  color: white;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}
.tier h3 { margin: 0 0 4px; font-size: 1.25rem; }
.tier .price {
  font-size: 2.25rem;
  font-weight: 800;
  margin: 12px 0 8px;
  letter-spacing: -0.02em;
}
.tier .price small { font-size: 0.95rem; color: var(--c-text-2); font-weight: 500; }
.tier ul {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: var(--c-text-2);
}
.tier ul li::before {
  content: '✓';
  color: var(--c-success);
  margin-right: 8px;
  font-weight: 700;
}

/* ── FAQ accordion ────────────────────────────────────────────── */
.faq {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.faq details {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 12px;
  padding: 0;
  overflow: hidden;
}
.faq summary {
  list-style: none;
  cursor: pointer;
  padding: 18px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-weight: 600;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--c-text-2);
  transition: transform 0.2s ease;
}
.faq details[open] summary::after { content: '−'; }
.faq details p {
  margin: 0;
  padding: 0 20px 20px;
  color: var(--c-text-2);
}

/* ── About panel ──────────────────────────────────────────────── */
.about {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
@media (max-width: 820px) { .about { grid-template-columns: 1fr; gap: 24px; } }
.about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.stat {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 24px;
}
.stat .num {
  font-size: 2rem;
  font-weight: 800;
  color: var(--c-primary);
  letter-spacing: -0.01em;
}
.stat .label { color: var(--c-text-2); }

/* ── Contact ──────────────────────────────────────────────────── */
.contact-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 32px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}
@media (max-width: 760px) { .contact-card { grid-template-columns: 1fr; } }
.contact-card a { font-weight: 600; }
.contact-list { display: flex; flex-direction: column; gap: 12px; margin: 0; padding: 0; list-style: none; color: var(--c-text-2); }
.contact-list strong { color: var(--c-text); display: block; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }

/* ── Footer ───────────────────────────────────────────────────── */
.site-footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: 48px 0 24px;
  margin-top: 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 32px;
}
@media (max-width: 760px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer-col h4 {
  margin: 0 0 12px;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--c-text-2);
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.footer-col a { color: var(--c-text-2); }
.footer-col a:hover { color: var(--c-text); text-decoration: none; }

.footer-bottom {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--c-border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--c-text-2);
  font-size: 0.85rem;
}

/* ── Legal pages (privacy, terms) ─────────────────────────────── */
.prose {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 0 64px;
}
.prose h1 {
  font-size: var(--fs-h1);
  margin: 24px 0 8px;
  letter-spacing: -0.01em;
}
.prose .meta {
  color: var(--c-text-2);
  font-size: 0.9rem;
  margin-bottom: 32px;
}
.prose h2 { font-size: 1.4rem; margin: 40px 0 12px; }
.prose h3 { font-size: 1.1rem; margin: 24px 0 8px; }
.prose p, .prose li { color: var(--c-text); }
.prose ul { padding-left: 20px; }

/* ── 404 ──────────────────────────────────────────────────────── */
.notfound {
  min-height: 70vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 0 24px;
}
.notfound .num {
  font-size: 8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1;
}