/* ═══════════════════════════════════════════════
   WorldAngle — Main Stylesheet
   ═══════════════════════════════════════════════ */

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

:root {
  --bg-deep:       #0a0e1a;
  --bg-card:       #111827;
  --bg-elevated:   #1a2235;
  --bg-border:     rgba(255,255,255,0.07);
  --teal:          #00b894;
  --teal-light:    #00cec9;
  --purple:        #6c5ce7;
  --purple-light:  #a29bfe;
  --text-1:        #f0f4ff;
  --text-2:        #9ca3af;
  --text-3:        #6b7280;
  --font:          'Inter', system-ui, -apple-system, sans-serif;
  --radius-sm:     8px;
  --radius-md:     14px;
  --radius-lg:     22px;
  --radius-xl:     32px;
  --section-gap:   120px;
  --transition:    0.25s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--text-1);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Utility ── */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--teal), var(--purple-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 100px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--teal), var(--teal-light));
  color: #fff;
  box-shadow: 0 4px 20px rgba(0,184,148,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(0,184,148,0.5);
}
.btn-ghost {
  background: rgba(255,255,255,0.05);
  color: var(--text-2);
  border: 1px solid var(--bg-border);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  color: var(--text-1);
}
.btn-outline {
  background: transparent;
  color: var(--teal);
  border: 1.5px solid var(--teal);
}
.btn-outline:hover {
  background: rgba(0,184,148,0.1);
}
.btn-lg { padding: 16px 32px; font-size: 15px; }

/* ── Scroll Animations ── */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.65s ease, transform 0.65s ease;
  transition-delay: var(--delay, 0ms);
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ══════════════════════════════
   NAV
══════════════════════════════ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 999;
  transition: background 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10,14,26,0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-color: var(--bg-border);
}
.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  gap: 40px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 18px;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.3px;
  flex-shrink: 0;
}
.nav-logo-icon { width: 30px; height: 30px; }
.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  margin-left: auto;
}
.nav-links a {
  text-decoration: none;
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--text-1); }
.nav-cta { margin-left: 16px; }
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--text-2);
  border-radius: 2px;
  transition: all 0.3s;
}
.nav-mobile {
  display: none;
  flex-direction: column;
  padding: 16px 24px 24px;
  background: rgba(10,14,26,0.96);
  border-top: 1px solid var(--bg-border);
}
.nav-mobile.open { display: flex; }
.nav-mobile-link {
  text-decoration: none;
  color: var(--text-2);
  font-size: 16px;
  font-weight: 500;
  padding: 12px 0;
  border-bottom: 1px solid var(--bg-border);
  transition: color var(--transition);
}
.nav-mobile-link:hover { color: var(--text-1); }

/* ══════════════════════════════
   HERO
══════════════════════════════ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  pointer-events: none;
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
}
.hero-glow--teal {
  width: 600px; height: 600px;
  top: -100px; left: -150px;
  background: radial-gradient(circle, rgba(0,184,148,0.15) 0%, transparent 70%);
}
.hero-glow--purple {
  width: 500px; height: 500px;
  bottom: -100px; right: -100px;
  background: radial-gradient(circle, rgba(108,92,231,0.15) 0%, transparent 70%);
}
.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid rgba(0,184,148,0.3);
  border-radius: 100px;
  font-size: 13px;
  color: var(--teal);
  font-weight: 500;
  margin-bottom: 28px;
  background: rgba(0,184,148,0.06);
}
.hero-badge-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 8px var(--teal);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}
.hero-h1 {
  font-size: clamp(42px, 5.5vw, 80px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -2px;
  margin-bottom: 24px;
}
.hero-sub {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 480px;
  margin-bottom: 36px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* Phone Mockup */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.phone-mockup {
  position: relative;
  width: 260px;
  animation: floatPhone 4s ease-in-out infinite;
}
@keyframes floatPhone {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-14px); }
}
.phone-frame {
  background: #1a1f2e;
  border-radius: 38px;
  padding: 12px;
  border: 1.5px solid rgba(255,255,255,0.1);
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.5),
    inset 0 1px 0 rgba(255,255,255,0.06),
    0 30px 80px rgba(0,0,0,0.6);
}
.phone-screen {
  background: #0d1117;
  border-radius: 28px;
  overflow: hidden;
  height: 460px;
}
.app-ui { height: 100%; display: flex; flex-direction: column; }
.app-bar {
  padding: 16px 16px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-2);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.app-bar-dot { width: 8px; height: 8px; border-radius: 50%; }
.app-tabs {
  display: flex;
  padding: 10px 12px 0;
  gap: 6px;
}
.app-tab {
  flex: 1;
  text-align: center;
  padding: 8px 4px;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-3);
  border-radius: 8px;
  cursor: pointer;
}
.app-tab--active {
  background: rgba(0,184,148,0.12);
  color: var(--teal);
  font-weight: 600;
}
.app-cards {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  overflow: hidden;
}
.app-card {
  background: rgba(255,255,255,0.04);
  border-radius: 12px;
  padding: 10px;
  display: flex;
  gap: 10px;
  border: 1px solid rgba(255,255,255,0.06);
}
.app-card-img {
  width: 44px; height: 44px;
  border-radius: 8px;
  flex-shrink: 0;
}
.app-card-info { flex: 1; display: flex; flex-direction: column; gap: 6px; justify-content: center; }
.app-card-title {
  height: 8px; width: 80%;
  background: rgba(255,255,255,0.12);
  border-radius: 4px;
}
.app-card-sub {
  height: 6px; width: 55%;
  background: rgba(255,255,255,0.06);
  border-radius: 4px;
}
.phone-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(ellipse at 50% 60%, rgba(108,92,231,0.25) 0%, transparent 70%);
  z-index: -1;
  filter: blur(20px);
}

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-3);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hero-scroll-line {
  width: 1px;
  height: 48px;
  background: linear-gradient(to bottom, var(--teal), transparent);
  animation: scrollLine 1.8s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { transform: scaleY(0); transform-origin: top; opacity: 1; }
  50% { transform: scaleY(1); transform-origin: top; opacity: 1; }
  100% { transform: scaleY(1); transform-origin: bottom; opacity: 0; }
}

/* ══════════════════════════════
   SECTION COMMON
══════════════════════════════ */
.section {
  padding: var(--section-gap) 0;
}
.section--dark {
  background: var(--bg-card);
  position: relative;
}
.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 16px;
}
.section-h2 {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.1;
  margin-bottom: 20px;
}
.section-desc {
  font-size: 17px;
  color: var(--text-2);
  max-width: 560px;
  line-height: 1.75;
  margin-bottom: 60px;
}

/* ══════════════════════════════
   FEATURES GRID
══════════════════════════════ */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 60px;
}
.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,184,148,0.04), rgba(108,92,231,0.04));
  opacity: 0;
  transition: opacity 0.3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,184,148,0.3);
  box-shadow: 0 12px 40px rgba(0,184,148,0.1);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: #fff;
}
.feature-icon--teal {
  background: linear-gradient(135deg, var(--teal), var(--teal-light));
  box-shadow: 0 4px 16px rgba(0,184,148,0.3);
}
.feature-icon--purple {
  background: linear-gradient(135deg, var(--purple), var(--purple-light));
  box-shadow: 0 4px 16px rgba(108,92,231,0.3);
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-1);
  margin-bottom: 10px;
}
.feature-desc {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.7;
  margin-bottom: 18px;
}
.feature-tag {
  display: inline-flex;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(0,184,148,0.08);
  color: var(--teal);
  border: 1px solid rgba(0,184,148,0.2);
}

/* WeChat CTA */
.wechat-cta {
  display: flex;
  align-items: center;
  gap: 40px;
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-xl);
  padding: 40px;
}
.qr-image {
  width: 110px; height: 110px;
  border-radius: 14px;
  object-fit: cover;
  display: block;
  flex-shrink: 0;
  border: 1.5px solid rgba(255,255,255,0.1);
}
.wechat-text h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
}
.wechat-text p {
  color: var(--text-2);
  font-size: 15px;
  margin-bottom: 20px;
}
.wechat-badges {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.wechat-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 100px;
  font-size: 13px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--teal), var(--teal-light));
  color: #fff;
  box-shadow: 0 4px 16px rgba(0,184,148,0.3);
}
.wechat-badge--outline {
  background: transparent;
  border: 1.5px solid rgba(255,255,255,0.12);
  color: var(--text-2);
  box-shadow: none;
}

/* ══════════════════════════════
   MISSION
══════════════════════════════ */
.mission-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 60% at 20% 50%, rgba(0,184,148,0.07) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 80% 50%, rgba(108,92,231,0.07) 0%, transparent 70%);
  pointer-events: none;
}
.mission-quote {
  font-size: clamp(22px, 3vw, 38px);
  font-weight: 700;
  line-height: 1.4;
  text-align: center;
  max-width: 800px;
  margin: 0 auto 80px;
  letter-spacing: -0.5px;
  color: var(--text-1);
}
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.pillar {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color 0.3s, background 0.3s;
}
.pillar:hover {
  border-color: rgba(0,184,148,0.2);
  background: rgba(255,255,255,0.05);
}
.pillar-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(0,184,148,0.15), rgba(108,92,231,0.15));
  border: 1px solid rgba(0,184,148,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--teal);
  margin-bottom: 20px;
}
.pillar-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}
.pillar-desc {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.75;
}

/* ══════════════════════════════
   STEPS
══════════════════════════════ */
.steps-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 20px;
  align-items: center;
  margin-top: 60px;
}
.step {
  background: var(--bg-card);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  text-align: center;
  transition: border-color 0.3s, transform 0.3s;
}
.step:hover {
  border-color: rgba(0,184,148,0.3);
  transform: translateY(-4px);
}
.step-num {
  font-size: 52px;
  font-weight: 900;
  line-height: 1;
  letter-spacing: -2px;
  margin-bottom: 12px;
}
.step-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(0,184,148,0.1);
  border: 1px solid rgba(0,184,148,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--teal);
  margin: 0 auto 16px;
}
.step-title {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 10px;
}
.step-desc {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
}
.step-arrow {
  font-size: 28px;
  color: var(--text-3);
  text-align: center;
}

/* ══════════════════════════════
   ABOUT
══════════════════════════════ */
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-desc {
  font-size: 16px;
  color: var(--text-2);
  line-height: 1.8;
  margin-bottom: 16px;
}
.about-globe {
  display: flex;
  justify-content: center;
}
.globe-svg {
  width: 100%;
  max-width: 320px;
  animation: rotateSlow 20s linear infinite;
}
@keyframes rotateSlow {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ══════════════════════════════
   FOOTER
══════════════════════════════ */
.footer {
  background: #070b15;
  border-top: 1px solid var(--bg-border);
  padding-top: 80px;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 80px;
  padding-bottom: 64px;
}
.footer-logo { margin-bottom: 16px; }
.footer-tagline {
  color: var(--text-3);
  font-size: 14px;
  margin-bottom: 8px;
}
.footer-domain {
  font-size: 13px;
  color: var(--teal);
  font-weight: 600;
}
.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.footer-col-title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 20px;
}
.footer-link {
  display: block;
  text-decoration: none;
  color: var(--text-2);
  font-size: 14px;
  margin-bottom: 12px;
  transition: color var(--transition);
}
.footer-link:hover { color: var(--text-1); }
.footer-bar {
  border-top: 1px solid var(--bg-border);
  padding: 20px 0;
}
.footer-bar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-3);
}

/* ══════════════════════════════
   RESPONSIVE
══════════════════════════════ */
@media (max-width: 1024px) {
  .hero-inner { gap: 40px; }
  .features-grid { gap: 16px; }
  .about-inner { gap: 48px; }
}

@media (max-width: 768px) {
  :root { --section-gap: 80px; }

  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }

  .hero { padding: 100px 0 60px; }
  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 48px;
  }
  .hero-badge, .hero-actions { justify-content: center; }
  .hero-sub { margin: 0 auto 36px; }
  .hero-visual { order: -1; }
  .phone-mockup { width: 200px; }
  .phone-screen { height: 360px; }
  .hero-scroll-hint { display: none; }

  .stats-inner { gap: 0; }
  .features-grid { grid-template-columns: 1fr; }

  .wechat-cta {
    flex-direction: column;
    text-align: center;
    gap: 24px;
    padding: 28px;
  }
  .wechat-badges { justify-content: center; }

  .pillars-grid { grid-template-columns: 1fr; gap: 16px; }

  .steps-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .step-arrow { display: none; }

  .about-inner { grid-template-columns: 1fr; gap: 40px; }
  .about-globe { display: none; }
  .section-h2 { text-align: left !important; }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-bottom: 40px;
  }
  .footer-links { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .footer-bar-inner { flex-direction: column; gap: 8px; text-align: center; }
}

@media (max-width: 480px) {
  .hero-h1 { letter-spacing: -1px; }
  .hero-actions { flex-direction: column; align-items: center; }
  .footer-links { grid-template-columns: 1fr; }
}