/* ============================================================
   TeiChapChap Landing Page — Synthetic Night Design System
   ============================================================ */

/* --- Design Tokens --- */
:root {
  /* Background Tiers */
  --bg-base: #050505;
  --bg-surface: #0A0A0A;
  --bg-overlay: #161616;
  --bg-elevated: #1A1A1A;
  --bg-card: #0E0E0E;

  /* Accents */
  --primary-lime: #DFFF00;
  --primary-lime-dim: rgba(223, 255, 0, 0.15);
  --primary-lime-glow: rgba(223, 255, 0, 0.05);
  --secondary-cyan: #00F5FF;
  --secondary-cyan-dim: rgba(0, 245, 255, 0.12);
  --secondary-cyan-glow: rgba(0, 245, 255, 0.05);

  /* Text */
  --text-primary: #FFFFFF;
  --text-secondary: rgba(255, 255, 255, 0.72);
  --text-tertiary: rgba(255, 255, 255, 0.48);

  /* Borders */
  --border-default: #1A1A1A;
  --border-subtle: #2A2A2A;
  --border-luminous: rgba(255, 255, 255, 0.08);

  /* WhatsApp Brand */
  --whatsapp-green: #25D366;
  --whatsapp-green-hover: #20BD5A;

  /* Telegram Brand */
  --telegram-blue: #0088CC;
  --telegram-blue-hover: #0077B5;

  /* Spacing (8px scale) */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;

  /* Radius */
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-full: 9999px;

  /* Typography */
  --font-headline: 'Hanken Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 600ms;

  /* Container */
  --container-max: 1200px;
  --container-margin: 32px;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-secondary);
  background-color: var(--bg-base);
  overflow-x: hidden;
}

::selection {
  background: var(--primary-lime);
  color: var(--bg-base);
}

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

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

/* --- Utility Classes --- */
.text-lime {
  color: var(--primary-lime);
}

.text-cyan {
  color: var(--secondary-cyan);
}

/* --- Section Shared --- */
.section-badge {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary-lime);
  background: var(--primary-lime-dim);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(223, 255, 0, 0.15);
  margin-bottom: var(--space-3);
}

.section-title {
  font-family: var(--font-headline);
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.section-subtitle {
  font-size: clamp(15px, 2vw, 18px);
  color: var(--text-tertiary);
  max-width: 560px;
  margin-bottom: var(--space-6);
}

/* ============================================================
   Navigation
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(5, 5, 5, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-luminous);
}

.nav__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-margin);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-headline);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav__logo-icon {
  color: var(--primary-lime);
  font-size: 14px;
}

.nav__logo-accent {
  color: var(--primary-lime);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav__link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-tertiary);
  transition: color var(--duration-fast) var(--ease-out);
  position: relative;
}

.nav__link:hover {
  color: var(--text-primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--primary-lime);
  transform: scaleX(0);
  transition: transform var(--duration-normal) var(--ease-out);
}

.nav__link:hover::after {
  transform: scaleX(1);
}

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

.nav__mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 1px;
  transition: all var(--duration-normal) var(--ease-out);
}

.nav__mobile-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav__mobile-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.nav__mobile-menu {
  display: none;
  flex-direction: column;
  padding: 0 var(--container-margin) var(--space-3);
  background: rgba(5, 5, 5, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-luminous);
}

.nav__mobile-menu.active {
  display: flex;
}

.nav__mobile-link {
  padding: 12px 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-default);
  transition: color var(--duration-fast);
}

.nav__mobile-link:hover {
  color: var(--primary-lime);
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px var(--container-margin) var(--space-7);
  overflow: hidden;
}

.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.12;
  pointer-events: none;
}

.hero__glow--left {
  width: 600px;
  height: 600px;
  background: var(--primary-lime);
  top: -150px;
  left: -200px;
  animation: glowPulse 8s ease-in-out infinite;
}

.hero__glow--right {
  width: 500px;
  height: 500px;
  background: var(--secondary-cyan);
  bottom: -100px;
  right: -150px;
  animation: glowPulse 8s ease-in-out 4s infinite;
}

@keyframes glowPulse {
  0%, 100% { opacity: 0.08; }
  50% { opacity: 0.18; }
}

.hero__container {
  position: relative;
  z-index: 1;
  max-width: 780px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-overlay);
  border: 1px solid var(--border-default);
  padding: 8px 18px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
  animation: fadeInUp 0.8s var(--ease-out);
}

.hero__title {
  font-family: var(--font-headline);
  font-size: clamp(36px, 7vw, 64px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: var(--space-3);
  animation: fadeInUp 0.8s var(--ease-out) 0.1s both;
}

.hero__title-accent {
  background: linear-gradient(135deg, var(--primary-lime) 0%, #B8FF00 40%, var(--secondary-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(15px, 2.2vw, 18px);
  color: var(--text-tertiary);
  max-width: 540px;
  margin-bottom: var(--space-2);
  animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}

.hero__no-apps {
  font-size: 14px;
  font-weight: 500;
  color: var(--secondary-cyan);
  margin-bottom: var(--space-5);
  animation: fadeInUp 0.8s var(--ease-out) 0.25s both;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.8s var(--ease-out) 0.3s both;
}

.hero__stats {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  animation: fadeInUp 0.8s var(--ease-out) 0.4s both;
}

.hero__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.hero__stat-number {
  font-family: var(--font-headline);
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-lime);
}

.hero__stat-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero__stat-divider {
  width: 1px;
  height: 32px;
  background: var(--border-default);
}

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.btn--lg {
  padding: 18px 36px;
  font-size: 16px;
}

.btn__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.btn--whatsapp {
  background: var(--whatsapp-green);
  color: #FFFFFF;
}

.btn--whatsapp:hover {
  background: var(--whatsapp-green-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 211, 102, 0.25);
}

.btn--telegram {
  background: var(--telegram-blue);
  color: #FFFFFF;
}

.btn--telegram:hover {
  background: var(--telegram-blue-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 136, 204, 0.25);
}

/* Coming Soon (disabled WhatsApp) */
.btn--coming-soon {
  background: transparent;
  color: var(--text-tertiary);
  border: 1px dashed var(--border-subtle);
  cursor: not-allowed;
  opacity: 0.6;
  pointer-events: none;
  user-select: none;
}

.btn--coming-soon .btn__icon {
  opacity: 0.5;
}

/* ============================================================
   How It Works
   ============================================================ */

.how {
  padding: var(--space-8) var(--container-margin);
  background: var(--bg-surface);
  position: relative;
}

.how__container {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.how__steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  margin-top: var(--space-6);
}

.how__step {
  flex: 1;
  max-width: 300px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
}

.how__step-icon {
  position: relative;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-3);
}

.how__step-icon svg {
  width: 40px;
  height: 40px;
  color: var(--primary-lime);
  position: relative;
  z-index: 1;
}

.how__step-icon::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--primary-lime-dim);
  border: 1px solid rgba(223, 255, 0, 0.2);
}

.how__step-number {
  position: absolute;
  top: -8px;
  right: -4px;
  font-family: var(--font-headline);
  font-size: 11px;
  font-weight: 700;
  color: var(--bg-base);
  background: var(--primary-lime);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  z-index: 2;
}

.how__connector {
  width: 80px;
  height: 1px;
  background: var(--border-default);
  margin-top: 40px;
  flex-shrink: 0;
  position: relative;
}

.how__connector::after {
  content: '';
  position: absolute;
  right: -4px;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--primary-lime);
  border-radius: 50%;
  opacity: 0.5;
}

.how__step-title {
  font-family: var(--font-headline);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.how__step-desc {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.6;
}

/* ============================================================
   Features
   ============================================================ */

.features {
  padding: var(--space-8) var(--container-margin);
}

.features__container {
  max-width: var(--container-max);
  margin: 0 auto;
  text-align: center;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-align: left;
  transition: all var(--duration-normal) var(--ease-out);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.05), transparent);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.feature-card:hover {
  border-color: var(--border-subtle);
  background: var(--bg-overlay);
  transform: translateY(-2px);
}

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

.feature-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
}

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

.feature-card__icon--lime {
  background: var(--primary-lime-dim);
  color: var(--primary-lime);
}

.feature-card__icon--cyan {
  background: var(--secondary-cyan-dim);
  color: var(--secondary-cyan);
}

.feature-card__title {
  font-family: var(--font-headline);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}

.feature-card__desc {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.65;
}

/* ============================================================
   CTA Banner
   ============================================================ */

.cta-banner {
  position: relative;
  padding: var(--space-7) var(--container-margin);
  overflow: hidden;
}

.cta-banner__glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, var(--primary-lime-glow) 0%, transparent 70%);
  pointer-events: none;
}

.cta-banner__container {
  position: relative;
  z-index: 1;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
  padding: var(--space-6) var(--space-5);
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.cta-banner__title {
  font-family: var(--font-headline);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.cta-banner__text {
  font-size: 16px;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.cta-banner__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
}

/* ============================================================
   Footer
   ============================================================ */

.footer {
  padding: var(--space-6) var(--container-margin) var(--space-3);
  background: var(--bg-surface);
  border-top: 1px solid var(--border-default);
}

.footer__container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: var(--space-6);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.footer__brand {
  max-width: 320px;
}

.footer__logo {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-headline);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}

.footer__tagline {
  font-size: 14px;
  color: var(--text-tertiary);
  line-height: 1.6;
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__col {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.footer__col-title {
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.footer__link {
  font-size: 14px;
  color: var(--text-secondary);
  transition: color var(--duration-fast);
}

.footer__link:hover {
  color: var(--primary-lime);
}

.footer__link--soon {
  cursor: default;
  color: var(--text-tertiary);
  opacity: 0.5;
}

.footer__bottom {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-top: var(--space-3);
  border-top: 1px solid var(--border-default);
  text-align: center;
}

.footer__bottom p {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ============================================================
   Animations
   ============================================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Scroll-reveal animation class (applied via JS) */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 1024px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .how__steps {
    flex-direction: column;
    align-items: center;
    gap: var(--space-5);
  }

  .how__connector {
    width: 1px;
    height: 40px;
    margin: 0;
  }
}

@media (max-width: 768px) {
  :root {
    --container-margin: 20px;
  }

  .nav__links {
    display: none;
  }

  .nav__mobile-toggle {
    display: flex;
  }

  .hero__stats {
    flex-direction: column;
    gap: var(--space-2);
  }

  .hero__stat-divider {
    width: 24px;
    height: 1px;
  }

  .features__grid {
    grid-template-columns: 1fr;
  }

  .hero__actions {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
  }

  .btn {
    justify-content: center;
  }

  .cta-banner__actions {
    flex-direction: column;
    width: 100%;
  }

  .footer__container {
    flex-direction: column;
    gap: var(--space-4);
  }

  .footer__links {
    gap: var(--space-4);
  }
}