/* =========================================================
   ChordExp – Global Stylesheet
   Primary: #4A90E2  Gradient: #4A90E2 → #5B9BD5
   ========================================================= */

:root {
  --primary: #4A90E2;
  --primary-dark: #2d6bbf;
  --primary-light: #5B9BD5;
  --accent: #7C3AED;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f8fafc;
  --border: #e5e7eb;
  --radius: 16px;
  --shadow: 0 4px 24px rgba(74,144,226,0.12);
  --shadow-lg: 0 12px 48px rgba(74,144,226,0.18);
  --transition: 0.25s ease;
  --max-w: 1200px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── Utilities ─────────────────────────────────────────── */
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }

/* ── Gradient text ─────────────────────────────────────── */
.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Buttons ───────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  box-shadow: 0 4px 16px rgba(74,144,226,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(74,144,226,0.45); }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
.btn-white {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 16px rgba(0,0,0,0.12);
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,0.16); }
.btn-lg { padding: 18px 36px; font-size: 1.05rem; }

/* ── Navigation ────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0;
  transition: all var(--transition);
}
.nav.scrolled {
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.25rem;
  color: #fff;
  transition: color var(--transition);
}
.nav.scrolled .nav-logo { color: var(--text); }
.nav-logo img { height: 32px; width: auto; border-radius: 0; }
.nav-logo-text span { color: var(--primary); }
.nav.scrolled .nav-logo-text { color: var(--text); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  transition: color var(--transition);
}
.nav.scrolled .nav-links a { color: var(--text-muted); }
.nav-links a:hover { color: var(--primary) !important; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-lang {
  display: flex;
  gap: 6px;
}
.nav-lang a {
  font-size: 0.8rem;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 6px;
  color: rgba(255,255,255,0.7);
  transition: all var(--transition);
}
.nav.scrolled .nav-lang a { color: var(--text-muted); }
.nav-lang a.active, .nav-lang a:hover {
  color: var(--primary) !important;
  background: rgba(74,144,226,0.1);
}
.nav-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
}
.nav-burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}
.nav.scrolled .nav-burger span { background: var(--text); }
.nav-mobile { display: none; }

/* ── Hero ──────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  background: linear-gradient(135deg, #1a2a4a 0%, #2d5a9e 50%, #4A90E2 100%);
  display: flex;
  align-items: center;
  padding: 100px 0 80px;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -30%;
  right: -10%;
  width: 700px;
  height: 700px;
  background: radial-gradient(circle, rgba(91,155,213,0.25) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -20%;
  left: -5%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(124,58,237,0.15) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 64px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 50px;
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.9);
  margin-bottom: 20px;
  backdrop-filter: blur(8px);
}
.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: #4ade80;
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}
.hero-title {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
}
.hero-title .highlight {
  background: linear-gradient(135deg, #93c5fd 0%, #c4b5fd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  line-height: 1.7;
  max-width: 480px;
}
.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
}
.hero-stats {
  display: flex;
  gap: 32px;
}
.hero-stat { text-align: center; }
.hero-stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: #fff;
  line-height: 1;
}
.hero-stat-label {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
  margin-top: 4px;
}
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}
.hero-mockup {
  width: 300px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 32px;
  backdrop-filter: blur(16px);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255,255,255,0.05);
  transform: perspective(1000px) rotateY(-8deg) rotateX(3deg);
  transition: transform var(--transition);
}
.hero-mockup:hover { transform: perspective(1000px) rotateY(-4deg) rotateX(1deg); }
.mockup-bar {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.mockup-bar-title { color: #fff; font-weight: 700; font-size: 1rem; }
.mockup-body { padding: 20px; }
.mockup-song {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.mockup-song-icon {
  width: 38px; height: 38px;
  background: rgba(74,144,226,0.3);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.mockup-song-title { color: #fff; font-weight: 600; font-size: 0.85rem; }
.mockup-song-sub { color: rgba(255,255,255,0.5); font-size: 0.75rem; }
.mockup-song-key {
  margin-left: auto;
  background: rgba(74,144,226,0.3);
  color: #93c5fd;
  border-radius: 8px;
  padding: 3px 8px;
  font-size: 0.75rem;
  font-weight: 700;
}
.hero-float-card {
  position: absolute;
  background: #fff;
  border-radius: 16px;
  padding: 14px 18px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  animation: float 4s ease-in-out infinite;
  white-space: nowrap;
}
.hero-float-card-1 { bottom: 40px; left: -40px; animation-delay: 0s; }
.hero-float-card-2 { top: 20px; right: -30px; animation-delay: 1.5s; }
.hero-float-card .icon {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.hero-float-card .icon svg { width: 18px; height: 18px; }
.icon-blue { background: rgba(74,144,226,0.12); }
.icon-green { background: rgba(34,197,94,0.12); }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ── Section common ────────────────────────────────────── */
.section { padding: 96px 0; }
.section-alt { background: var(--bg-alt); }
.section-label {
  display: inline-block;
  background: rgba(74,144,226,0.1);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 50px;
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 16px;
}
.section-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.7;
}
.section-header { text-align: center; margin-bottom: 64px; }

/* ── Features ──────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.feature-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
  opacity: 0;
  transition: opacity var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: transparent; }
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
}
.feature-icon svg { width: 26px; height: 26px; }
.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text);
}
.feature-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── How it works ──────────────────────────────────────── */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  position: relative;
}
.steps::before {
  content: '';
  position: absolute;
  top: 28px;
  left: calc(16.66% + 16px);
  right: calc(16.66% + 16px);
  height: 2px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
  opacity: 0.25;
}
.step { text-align: center; }
.step-num {
  width: 56px; height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  box-shadow: 0 4px 16px rgba(74,144,226,0.35);
}
.step h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.step p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── Showcase (feature detail rows) ───────────────────── */
.showcase-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 80px;
  padding: 48px 0;
  border-bottom: 1px solid var(--border);
}
.showcase-row:last-child { border-bottom: none; }
.showcase-row.reverse { direction: rtl; }
.showcase-row.reverse > * { direction: ltr; }
.showcase-content { }
.showcase-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(74,144,226,0.1);
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 700;
  padding: 5px 12px;
  border-radius: 50px;
  margin-bottom: 16px;
}
.showcase-title {
  font-size: 1.7rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 16px;
}
.showcase-desc {
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 24px;
}
.showcase-list { margin-bottom: 28px; }
.showcase-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}
.showcase-list li::before {
  content: '✓';
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px; height: 20px;
  background: rgba(74,144,226,0.12);
  color: var(--primary);
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 800;
  flex-shrink: 0;
}
.showcase-visual {
  background: linear-gradient(135deg, #f0f7ff 0%, #e8f4ff 100%);
  border-radius: 24px;
  padding: 32px;
  border: 1px solid rgba(74,144,226,0.15);
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.showcase-visual::before {
  content: '';
  position: absolute;
  top: -40px; right: -40px;
  width: 200px; height: 200px;
  background: radial-gradient(circle, rgba(74,144,226,0.12) 0%, transparent 70%);
}
.chord-demo {
  font-family: 'Courier New', monospace;
  background: #1e293b;
  border-radius: 14px;
  padding: 24px;
  color: #e2e8f0;
  font-size: 0.85rem;
  width: 100%;
  box-shadow: var(--shadow-lg);
  line-height: 1.8;
}
.chord-demo .chord { color: #93c5fd; font-weight: 700; }
.chord-demo .lyric { color: #e2e8f0; }
.chord-demo .comment { color: #64748b; }
.setlist-demo {
  width: 100%;
}
.setlist-item {
  background: #fff;
  border-radius: 12px;
  padding: 12px 16px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  border: 1px solid var(--border);
}
.setlist-num {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #fff;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}
.setlist-info { flex: 1; }
.setlist-title { font-size: 0.85rem; font-weight: 600; color: var(--text); }
.setlist-sub { font-size: 0.75rem; color: var(--text-muted); }
.setlist-key {
  background: rgba(74,144,226,0.1);
  color: var(--primary);
  border-radius: 6px;
  padding: 2px 8px;
  font-size: 0.75rem;
  font-weight: 700;
}

/* ── Testimonials ──────────────────────────────────────── */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
}
.testimonial-stars { color: #f59e0b; font-size: 0.9rem; margin-bottom: 14px; }
.testimonial-text {
  font-size: 0.92rem;
  color: var(--text);
  line-height: 1.65;
  margin-bottom: 20px;
  font-style: italic;
}
.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}
.testimonial-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}
.testimonial-name { font-weight: 700; font-size: 0.88rem; }
.testimonial-role { font-size: 0.78rem; color: var(--text-muted); }

/* ── CTA Banner ────────────────────────────────────────── */
.cta-section {
  background: linear-gradient(135deg, #1a2a4a 0%, #2d5a9e 50%, #4A90E2 100%);
  padding: 96px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(255,255,255,0.05) 0%, transparent 60%);
}
.cta-section h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
}
.cta-section p {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 36px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta-note {
  margin-top: 16px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.55);
}

/* ── Footer ────────────────────────────────────────────── */
.footer {
  background: #0f172a;
  color: rgba(255,255,255,0.6);
  padding: 64px 0 32px;
}
.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  margin-bottom: 32px;
}
.footer-brand { }
.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
  color: #fff;
  margin-bottom: 16px;
}
.footer-logo img { width: 32px; height: 32px; border-radius: 9px; }
.footer-desc {
  font-size: 0.88rem;
  line-height: 1.6;
  max-width: 260px;
  margin-bottom: 20px;
}
.footer-col h4 {
  color: #fff;
  font-size: 0.88rem;
  font-weight: 700;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition);
}
.footer-col ul li a:hover { color: #fff; }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.82rem;
}
.footer-lang { display: flex; gap: 12px; }
.footer-lang a {
  color: rgba(255,255,255,0.45);
  font-size: 0.82rem;
  transition: color var(--transition);
}
.footer-lang a:hover, .footer-lang a.active { color: var(--primary); }

/* ── Mobile ────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .hero-inner { grid-template-columns: 1fr; gap: 48px; }
  .hero-visual { display: none; }
  .hero { min-height: auto; padding: 100px 0 64px; }
  .hero-stats { gap: 24px; }
  .features-grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .steps::before { display: none; }
  .showcase-row { grid-template-columns: 1fr; gap: 32px; }
  .showcase-row.reverse { direction: ltr; }
  .testimonials-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
  .nav-links, .nav-actions .btn { display: none; }
  .nav-burger { display: flex; }
  .nav-mobile {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: #fff;
    padding: 20px 24px;
    box-shadow: var(--shadow);
    gap: 16px;
    transform: translateY(-120%);
    transition: transform var(--transition);
    z-index: 99;
  }
  .nav-mobile.open { transform: translateY(0) !important; }
  .nav-mobile a {
    font-size: 1rem;
    color: var(--text);
    font-weight: 500;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
  }
  .nav-mobile .btn { width: 100%; justify-content: center; }
  .nav-lang { display: none; }
}