/* =========================================
   SAYTM Landing Page — Global Styles
   ========================================= */

/* ---------- CSS Custom Properties ---------- */
:root {
  --color-bg: #FDFCFA;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F8F5F0;
  --color-gold: #C5963A;
  --color-gold-light: #E5C88A;
  --color-gold-dark: #A67C2E;
  --color-text: #1A1A1A;
  --color-text-muted: #6B6B6B;
  --color-text-light: #999999;
  --color-border: #E8E3DC;
  --color-cta-bg: #FFF5E6;

  --font-display: 'Plus Jakarta Sans', sans-serif;
  --font-body: 'DM Sans', sans-serif;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 50px;
  --radius-xl: 60px;

  --shadow-soft: 0 2px 20px rgba(0, 0, 0, 0.04);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-elevated: 0 8px 40px rgba(0, 0, 0, 0.08);

  --max-width: 1120px;
  --gutter: 24px;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

button,
input {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

/* ---------- Utility ---------- */
.hidden {
  display: none !important;
}

.hide-mobile {
  display: inline;
}

/* =========================================
   NAVBAR
   ========================================= */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(253, 252, 250, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition);
}

.navbar.scrolled {
  box-shadow: var(--shadow-soft);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
}

.logo-img {
  height: 40px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-gold);
  transition: width var(--transition);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-links a:hover::after {
  width: 100%;
}

.btn-signin {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 20px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  transition: all var(--transition);
}

.btn-signin:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background: rgba(197, 150, 58, 0.05);
}

/* Mobile toggle */
.mobile-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}

.mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
  opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* =========================================
   PRIMARY BUTTON
   ========================================= */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 14px 28px;
  background: var(--color-text);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary:hover {
  background: #333;
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
}

.btn-primary:active {
  transform: translateY(0);
}

/* =========================================
   HERO
   ========================================= */
.hero {
  padding: 140px var(--gutter) 60px;
  text-align: center;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero-badge {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 2.5px;
  color: var(--color-gold);
  margin-bottom: 24px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
  margin-bottom: 20px;
}

.gold-dot {
  color: var(--color-gold);
}

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 520px;
  margin: 0 auto 36px;
  line-height: 1.65;
}

.hero-form {
  display: inline-flex;
  align-items: center;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 6px 6px 6px 24px;
  gap: 8px;
  box-shadow: var(--shadow-soft);
  transition: border-color var(--transition), box-shadow var(--transition);
  max-width: 480px;
  width: 100%;
}

.hero-form:focus-within {
  border-color: var(--color-gold-light);
  box-shadow: 0 0 0 4px rgba(197, 150, 58, 0.1);
}

.hero-input {
  flex: 1;
  min-width: 0;
  font-size: 0.95rem;
  color: var(--color-text);
  background: transparent;
}

.hero-input::placeholder {
  color: var(--color-text-light);
}

.hero-note {
  margin-top: 14px;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* =========================================
   AUDIO SECTION
   ========================================= */
.audio-section {
  max-width: 700px;
  margin: 40px auto 60px;
  padding: 0 var(--gutter);
}

.audio-player {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 32px 28px 20px;
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-border);
}

.waveform-container {
  position: relative;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.waveform-canvas {
  width: 100%;
  height: 80px;
  display: block;
}

.play-btn {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-gold);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 16px rgba(197, 150, 58, 0.35);
}

.play-btn:hover {
  transform: translate(-50%, -50%) scale(1.08);
  box-shadow: 0 6px 24px rgba(197, 150, 58, 0.45);
}

.play-btn svg {
  width: 20px;
  height: 20px;
}

.play-icon {
  margin-left: 2px;
}

.audio-time {
  display: block;
  text-align: right;
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 8px;
  font-variant-numeric: tabular-nums;
}

/* =========================================
   FEATURES
   ========================================= */
.features {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px var(--gutter) 60px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  text-align: center;
  padding: 36px 24px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  border: 1px solid transparent;
  transition: all var(--transition);
}

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

.feature-icon {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
  background: var(--color-surface-alt);
  color: var(--color-gold);
  transition: background var(--transition);
}

.feature-card:hover .feature-icon {
  background: var(--color-cta-bg);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.feature-desc {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.55;
  max-width: 240px;
  margin: 0 auto;
}

/* =========================================
   SECTION DIVIDER
   ========================================= */
.section-divider {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
  border-bottom: 1px solid var(--color-border);
}

/* =========================================
   TRUSTED SECTION
   ========================================= */
.trusted {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 72px var(--gutter) 48px;
}

.section-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 2.5px;
  color: var(--color-text-light);
  text-transform: uppercase;
  margin-bottom: 28px;
}

.trusted-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.trusted-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

.trusted-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  padding-top: 6px;
}

/* =========================================
   USE CASES
   ========================================= */
.use-cases {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px var(--gutter) 72px;
}

.use-cases-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.use-case-card {
  padding: 28px 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: all var(--transition);
}

.use-case-card:hover {
  border-color: var(--color-gold-light);
  box-shadow: var(--shadow-card);
  transform: translateY(-3px);
}

.use-case-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-gold);
  margin-bottom: 14px;
}

.use-case-icon svg {
  width: 24px;
  height: 24px;
}

.use-case-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 6px;
}

.use-case-desc {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* =========================================
   CTA BANNER
   ========================================= */
.cta-banner {
  max-width: var(--max-width);
  margin: 0 auto 60px;
  padding: 0 var(--gutter);
}

.cta-content {
  background: var(--color-cta-bg);
  border-radius: 20px;
  padding: 48px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.cta-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--color-gold);
  margin-bottom: 10px;
}

.cta-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 1.9rem);
  font-weight: 700;
  margin-bottom: 8px;
}

.cta-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  max-width: 360px;
  line-height: 1.55;
}

.cta-form {
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 5px 5px 5px 20px;
  gap: 8px;
  min-width: 360px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.cta-form:focus-within {
  border-color: var(--color-gold-light);
  box-shadow: 0 0 0 4px rgba(197, 150, 58, 0.1);
}

.cta-input {
  flex: 1;
  min-width: 0;
  font-size: 0.9rem;
  color: var(--color-text);
  background: transparent;
}

.cta-input::placeholder {
  color: var(--color-text-light);
}

/* =========================================
   FOOTER
   ========================================= */
.footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px var(--gutter) 28px;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--color-text);
}

.footer-social {
  display: flex;
  gap: 16px;
  align-items: center;
}

.footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.footer-social a:hover {
  color: var(--color-text);
}

.footer-social svg {
  width: 18px;
  height: 18px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  border-top: 1px solid var(--color-border);
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--color-text-light);
}

.footer-legal {
  display: flex;
  gap: 24px;
}

.footer-legal a {
  font-size: 0.78rem;
  color: var(--color-text-light);
  transition: color var(--transition);
}

.footer-legal a:hover {
  color: var(--color-text);
}

/* =========================================
   ANIMATIONS (on scroll)
   ========================================= */
.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================
   RESPONSIVE — Tablet (≤ 900px)
   ========================================= */
@media (max-width: 900px) {
  .trusted-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .use-cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cta-content {
    flex-direction: column;
    text-align: center;
    padding: 40px 32px;
  }

  .cta-desc {
    margin: 0 auto;
  }

  .cta-form {
    min-width: unset;
    width: 100%;
    max-width: 440px;
  }
}

/* =========================================
   RESPONSIVE — Mobile (≤ 640px)
   ========================================= */
@media (max-width: 640px) {
  :root {
    --gutter: 18px;
  }

  .hide-mobile {
    display: none;
  }

  /* Navbar mobile */
  .nav-links {
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: rgba(253, 252, 250, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.open {
    max-height: 240px;
    padding: 20px 0;
  }

  .nav-links li {
    width: 100%;
    text-align: center;
  }

  .nav-links a {
    display: block;
    padding: 12px 0;
    font-size: 1rem;
  }

  .btn-signin {
    display: none;
  }

  .mobile-toggle {
    display: flex;
  }

  /* Hero mobile */
  .hero {
    padding: 110px var(--gutter) 40px;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .hero-form {
    flex-direction: column;
    padding: 16px;
    border-radius: var(--radius-md);
    gap: 12px;
  }

  .hero-input {
    width: 100%;
    text-align: center;
    padding: 12px 0;
  }

  .btn-primary {
    width: 100%;
    justify-content: center;
  }

  /* Features mobile */
  .features-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .feature-card {
    padding: 28px 20px;
  }

  /* Use cases mobile */
  .use-cases-grid {
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  /* CTA mobile */
  .cta-content {
    padding: 32px 20px;
  }

  .cta-form {
    flex-direction: column;
    padding: 14px;
    border-radius: var(--radius-md);
    gap: 12px;
  }

  .cta-input {
    width: 100%;
    text-align: center;
    padding: 10px 0;
  }

  /* Footer mobile */
  .footer-top {
    flex-direction: column;
    gap: 20px;
    align-items: flex-start;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 16px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
}

/* =========================================
   RESPONSIVE — Small Mobile (≤ 400px)
   ========================================= */
@media (max-width: 400px) {
  .use-cases-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 1.9rem;
  }
}