/* ===== Tokens — Singing Lessons design system ===== */
:root {
  /* Brand (same in both modes) — navy + green from the app icon */
  --brand: #1B3954;
  --brand-deep: #0F2336;
  --brand-light: #3A6186;
  --accent: #92B558;
  --accent-hover: #A5C46F;
  /* darker green for text on light surfaces (AA contrast) */
  --accent-deep: #557A2B;
  --brand-tint: #E4EBF2;
  --accent-tint: #EAF2DF;

  /* Superficie — modo claro */
  --bg: #F2F2F7;
  --card: #FFFFFF;
  --ink: #1C1C1E;
  --secondary: #6E6E73;
  --tertiary: #AEAEB2;
  --separator: rgba(60, 60, 67, 0.1);
  --ring-track: #EDEDF2;
  --active-tint: #FAFAFC;

  --font-system: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --radius-card: 20px;
  --radius-card-lg: 22px;
  --radius-icon: 12px;
  --radius-pill: 100px;
  --shadow-card: 0 10px 26px rgba(28, 28, 30, 0.07), 0 1px 3px rgba(28, 28, 30, 0.05);
  --container-width: 1160px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0A1520;
    --card: #13212F;
    --accent-deep: #A5C46F;
    --ink: #F2F2F5;
    --secondary: #9C9CA6;
    --tertiary: #6B6B74;
    --separator: rgba(255, 255, 255, 0.12);
    --ring-track: rgba(255, 255, 255, 0.14);
    --active-tint: rgba(255, 255, 255, 0.05);
  }
}
:root[data-theme="dark"] {
  --bg: #0A1520;
  --card: #13212F;
  --accent-deep: #A5C46F;
  --ink: #F2F2F5;
  --secondary: #9C9CA6;
  --tertiary: #6B6B74;
  --separator: rgba(255, 255, 255, 0.12);
  --ring-track: rgba(255, 255, 255, 0.14);
  --active-tint: rgba(255, 255, 255, 0.05);
}

/* ===== Reset ===== */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-system);
  color: var(--secondary);
  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; }
h1, h2, h3, h4 {
  font-family: var(--font-system);
  color: var(--ink);
  line-height: 1.15;
  font-weight: 800;
}
h1 { font-size: clamp(2.4rem, 4.5vw, 3.6rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
h3 { font-size: 1.15rem; font-weight: 700; color: var(--ink); }

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 24px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--brand-deep);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-icon);
  z-index: 200;
}
.skip-link:focus { left: 16px; top: 16px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-system);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 13px 24px;
  border-radius: var(--radius-pill);
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn img { filter: brightness(0) invert(1); }
.btn-primary {
  background: var(--accent);
  color: var(--brand-deep);
  box-shadow: 0 8px 20px -6px rgba(146, 181, 88, 0.5);
}
.btn-primary img { filter: brightness(0); }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-2px); }
.btn-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.16);
}
.btn-secondary:hover { background: rgba(255, 255, 255, 0.16); transform: translateY(-2px); }
.btn-lg { padding: 16px 28px; font-size: 1.02rem; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--card);
  border-bottom: 1px solid var(--separator);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 78px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-system);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--ink);
  flex-shrink: 0;
  white-space: nowrap;
}
.logo-mark { border-radius: 22%; flex-shrink: 0; }
.main-nav {
  display: flex;
  gap: 32px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--secondary);
}
.main-nav a:hover { color: var(--accent-deep); }
.header-cta { display: flex; align-items: center; gap: 16px; }
.header-cta .btn-primary { box-shadow: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  transition: transform .2s ease, opacity .2s ease;
}
.nav-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== Hero (superficie oscura de marca + curva de tono) ===== */
.hero {
  position: relative;
  padding: 96px 0 64px;
  background: linear-gradient(165deg, var(--brand) 0%, var(--brand-deep) 100%);
  overflow: hidden;
  isolation: isolate;
}
.hero-wave {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.5;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 56px;
  align-items: center;
}
.eyebrow {
  font-family: var(--font-system);
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  margin-bottom: 14px;
}
.hero h1 { color: #fff; }
.hero-lead {
  margin-top: 20px;
  font-size: 1.08rem;
  max-width: 46ch;
  color: rgba(255, 255, 255, 0.72);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 32px;
}
.hero-actions-meta { margin-top: 18px; }
.rating-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.9rem;
  color: #fff;
}
.rating-badge .stars { color: var(--accent); letter-spacing: 2px; }
.rating-badge-lg { justify-content: center; margin-top: 18px; font-size: 1rem; color: var(--ink); }
.rating-badge-lg .stars { color: var(--accent); }
.hero-fine-print {
  margin-top: 18px;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.5);
}

.hero-visual { position: relative; display: flex; justify-content: center; }
.phone-mock {
  width: 280px;
  height: 570px;
  background: var(--brand-deep);
  border-radius: 44px;
  padding: 14px;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.5);
  position: relative;
  border: 1px solid rgba(255,255,255,0.08);
}
.phone-notch {
  position: absolute;
  top: 14px;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 22px;
  background: var(--brand-deep);
  border-radius: 0 0 16px 16px;
  z-index: 2;
}
.phone-screen {
  width: 100%;
  height: 100%;
  border-radius: 32px;
  padding-top: 28px;
  object-fit: cover;
  object-position: top center;
  background: #fff;
}
.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--card);
  border-radius: var(--radius-icon);
  box-shadow: var(--shadow-card);
  padding: 10px 16px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--ink);
}
.floating-card svg { width: 16px; height: 16px; color: var(--accent-deep); flex-shrink: 0; }
.floating-card-1 { top: 18%; left: -8px; }
.floating-card-2 { bottom: 14%; right: -12px; }

/* ===== Social proof ===== */
.social-proof {
  padding: 22px 0;
  text-align: center;
  color: var(--tertiary);
  font-weight: 600;
  border-bottom: 1px solid var(--separator);
}

/* ===== Sections ===== */
.section { padding: 96px 0; }
.section-alt { background: var(--card); }
.section-heading { max-width: 640px; margin: 0 auto 56px; text-align: center; }
.section-heading .eyebrow { display: block; text-align: center; color: var(--accent-deep); }
.section-lead { margin-top: 16px; }

/* ===== Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.feature-card {
  background: var(--card);
  border-radius: var(--radius-card);
  padding: 32px 28px;
  box-shadow: var(--shadow-card);
  transition: transform .2s ease;
}
.feature-card:hover { transform: translateY(-4px); }
.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--brand-tint);
  border-radius: var(--radius-icon);
  margin-bottom: 18px;
  color: var(--brand);
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-icon.is-accent { background: var(--accent-tint); color: var(--accent-deep); }
.feature-card h3 { margin-bottom: 8px; }
.feature-card p { font-size: 0.95rem; }

/* ===== Steps ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.step {
  background: var(--card);
  border-radius: var(--radius-card);
  padding: 28px;
  box-shadow: var(--shadow-card);
}
.step-number {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-icon);
  background: var(--brand);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-system);
  font-weight: 800;
  margin-bottom: 16px;
}
.step-copy h3 { color: var(--ink); }
.step-copy p { font-size: 0.95rem; margin-top: 6px; }

/* ===== AI vocal analysis ===== */
.ai-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.ai-copy .section-heading { text-align: left; margin: 0 0 28px; }
.ai-copy .section-heading .eyebrow { text-align: left; }
.ai-list { display: flex; flex-direction: column; gap: 14px; }
.ai-list li { display: flex; gap: 12px; align-items: flex-start; }
.ai-list svg { width: 22px; height: 22px; flex-shrink: 0; color: var(--accent-deep); margin-top: 2px; }
.ai-list strong { color: var(--ink); }
.ai-panel {
  background: linear-gradient(165deg, var(--brand) 0%, var(--brand-deep) 100%);
  border-radius: var(--radius-card-lg);
  padding: 36px 32px;
  color: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-card);
}
.ai-panel h3 { color: #fff; font-size: 1.25rem; margin-bottom: 6px; }
.ai-panel > p { font-size: 0.95rem; margin-bottom: 24px; }
.dimension-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.dimension-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
}
.dimension-chip::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}
.ai-panel .fine { margin-top: 22px; font-size: 0.8rem; color: rgba(255, 255, 255, 0.5); }

/* ===== Voice types ===== */
.voice-types { padding-top: 0; }
.voice-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.pill {
  padding: 10px 22px;
  border-radius: var(--radius-pill);
  background: var(--brand-tint);
  color: var(--brand);
  font-weight: 700;
  font-size: 0.9rem;
}

/* ===== Reviews ===== */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  max-width: 860px;
  margin: 0 auto;
  gap: 20px;
}
.review-card {
  background: var(--bg);
  border-radius: var(--radius-card);
  padding: 28px;
}
.review-card p { font-size: 1rem; color: var(--ink); font-style: italic; }
.review-card footer { margin-top: 16px; font-weight: 700; font-size: 0.85rem; color: var(--tertiary); }
.reviews-more { text-align: center; margin-top: 40px; }
.reviews-more a { color: var(--accent-deep); font-weight: 700; }

/* ===== CTA final (superficie oscura de marca + curva de tono) ===== */
.cta-final {
  position: relative;
  background: linear-gradient(165deg, var(--brand) 0%, var(--brand-deep) 100%);
  color: #fff;
  padding: 90px 0;
  overflow: hidden;
  isolation: isolate;
}
.cta-final .hero-wave { opacity: 0.5; }
.cta-final-inner { text-align: center; max-width: 620px; margin: 0 auto; }
.cta-final h2 { color: #fff; }
.cta-final p { margin: 18px 0 32px; font-size: 1.05rem; color: rgba(255,255,255,0.72); }
.cta-final-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }

/* ===== FAQ ===== */
.faq-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
  background: var(--card);
  border-radius: var(--radius-icon);
  padding: 18px 22px;
  box-shadow: var(--shadow-card);
}
.faq-item summary {
  cursor: pointer;
  font-family: var(--font-system);
  font-weight: 700;
  color: var(--ink);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-item summary::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--accent);
  transition: transform .2s ease;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p { margin-top: 12px; font-size: 0.95rem; }
.faq-item a, .ai-list a { color: var(--accent-deep); font-weight: 600; }

/* ===== Footer ===== */
.site-footer { background: var(--brand-deep); color: rgba(255,255,255,0.65); padding: 70px 0 24px; }
.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 48px;
}
.footer-brand .logo { color: #fff; margin-bottom: 14px; }
.footer-brand p { font-size: 0.9rem; margin-bottom: 22px; max-width: 34ch; }
.footer-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.footer-nav h4 { color: #fff; font-size: 0.9rem; margin-bottom: 18px; }
.footer-nav a { display: block; font-size: 0.9rem; margin-bottom: 12px; color: rgba(255,255,255,0.65); }
.footer-nav a:hover { color: #fff; }
.footer-bottom {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.82rem;
  color: rgba(255,255,255,0.4);
}

/* ===== Legal pages ===== */
.legal-hero {
  position: relative;
  padding: 64px 0 40px;
  background: linear-gradient(165deg, var(--brand) 0%, var(--brand-deep) 100%);
}
.legal-hero h1 { color: #fff; margin-top: 4px; }
.legal-updated { margin-top: 12px; color: rgba(255,255,255,0.6); font-size: 0.9rem; }
.legal-section { padding-top: 64px; }
.legal-container {
  max-width: 720px;
  color: var(--secondary);
  font-size: 1rem;
}
.legal-container > p { margin-bottom: 20px; }
.legal-container h2 {
  font-size: 1.3rem;
  margin-top: 44px;
  margin-bottom: 16px;
}
.legal-container h2:first-child { margin-top: 0; }
.legal-container h2, .section { scroll-margin-top: 90px; }
.legal-container a { color: var(--accent-deep); font-weight: 600; }
.legal-list {
  list-style: disc;
  padding-left: 22px;
  margin-bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.legal-list li { padding-left: 4px; }

/* ===== Reveal on scroll ===== */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ===== Responsive ===== */
@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .phone-mock { width: 220px; height: 450px; }
  .features-grid, .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .ai-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .header-cta .btn-primary { display: none; }
  .site-header.is-open .main-nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 78px;
    left: 0;
    right: 0;
    background: var(--card);
    padding: 24px;
    gap: 18px;
    border-bottom: 1px solid var(--separator);
    box-shadow: var(--shadow-card);
  }
  .site-header.is-open .header-cta .btn-primary {
    display: inline-flex;
  }
}

@media (max-width: 720px) {
  .features-grid, .steps-grid, .reviews-grid, .ai-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .section { padding: 64px 0; }
  .hero { padding: 48px 0 40px; }
}