/* ZGent Landing Site — Design System
 * Dark theme matching brand identity (#0b0b1f base)
 * System font stack for body
 */

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

:root {
  --bg-deep:    #050510;
  --bg-base:    #0b0b1f;
  --bg-surface: #12122a;
  --bg-card:    #1a1a36;
  --bg-hover:   #222244;

  --fg:         #e8e8f0;
  --fg-muted:   #9898b0;
  --fg-dim:     #6868880;

  --accent-cyan:   #00caf5;
  --accent-purple: #c800e4;
  --accent-orange: #e96700;
  --accent-green:  #00dc67;
  --accent-red:    #ec2300;

  --radius:     12px;
  --radius-lg:  20px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);

  --max-w: 1200px;
  --nav-h: 64px;
}

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

body {
  font-family: ui-sans-serif, system-ui, 'Noto Sans CJK SC', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', 'Noto Color Emoji';
  background: var(--bg-deep);
  color: var(--fg);
  line-height: 1.6;
  overflow-x: hidden;
}

a { color: var(--accent-cyan); text-decoration: none; transition: color var(--transition); }
a:hover { color: #4dd8f7; }

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

/* ── Typography ───────────────────────────────────────────────── */
h1, h2, h3, h4 { font-weight: 600; line-height: 1.2; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

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

.text-muted { color: var(--fg-muted); }
.text-center { text-align: center; }

/* ── Layout ───────────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 120px 0;
  position: relative;
}

section:not(:first-of-type)::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(80%, 600px);
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
}

/* ── Navigation ───────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-h);
  z-index: 100;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: rgba(5, 5, 16, 0.75);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  transition: background var(--transition);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--fg);
}

.nav-brand img, .nav-brand svg {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

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

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

.nav-cta {
  padding: 8px 20px;
  border-radius: 8px;
  background: var(--accent-cyan);
  color: var(--bg-deep) !important;
  font-weight: 600;
  font-size: 0.85rem;
  transition: all var(--transition);
}

.nav-cta:hover {
  background: #4dd8f7;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0, 202, 245, 0.3);
}

/* Mobile nav toggle */
.nav-toggle { display: none; background: none; border: none; color: var(--fg); cursor: pointer; padding: 8px; }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(5, 5, 16, 0.95);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
  }
  .nav-toggle { display: block; }
}

/* ── Hero Section ─────────────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  overflow: hidden;
  padding-top: var(--nav-h);
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 40%, rgba(0, 202, 245, 0.08), transparent),
    radial-gradient(ellipse 60% 50% at 30% 60%, rgba(200, 0, 228, 0.06), transparent),
    radial-gradient(ellipse 50% 40% at 70% 70%, rgba(233, 103, 0, 0.05), transparent);
  animation: hero-glow 12s ease-in-out infinite alternate;
}

@keyframes hero-glow {
  0%   { opacity: 0.6; transform: scale(1); }
  100% { opacity: 1;   transform: scale(1.05); }
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 24px;
}

.hero h1 { margin-bottom: 24px; }

.hero-subtitle {
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  color: var(--fg-muted);
  max-width: 600px;
  margin: 0 auto 48px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Buttons ──────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent-cyan);
  color: var(--bg-deep);
}

.btn-primary:hover {
  background: #4dd8f7;
  color: var(--bg-deep);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 202, 245, 0.3);
}

.btn-outline {
  background: transparent;
  color: var(--fg);
  border: 1px solid rgba(255,255,255,0.15);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.3);
  color: var(--fg);
  transform: translateY(-2px);
}

/* ── App Cards ────────────────────────────────────────────────── */
.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 60px;
}

.app-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  color: var(--fg);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.app-card:hover {
  background: var(--bg-hover);
  border-color: rgba(255,255,255,0.12);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  color: var(--fg);
}

.app-card-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.app-card-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  flex-shrink: 0;
}

.app-card-title {
  font-size: 1.3rem;
  font-weight: 600;
}

.app-card-accent {
  width: 40px;
  height: 3px;
  border-radius: 2px;
}

.app-card-desc {
  color: var(--fg-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  flex: 1;
}

.app-card-arrow {
  color: var(--fg-muted);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition);
}

.app-card:hover .app-card-arrow {
  color: var(--accent-cyan);
  transform: translateX(4px);
}

/* ── Tech Section ─────────────────────────────────────────────── */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.tech-card {
  background: var(--bg-surface);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 28px;
}

.tech-card h3 {
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.tech-card p {
  color: var(--fg-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.tech-icon {
  font-size: 1.4rem;
}

/* ── Download Page ────────────────────────────────────────────── */
.download-section {
  padding: 40px 0;
  min-height: auto;
}

.download-app {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 32px;
}

.download-app-header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 28px;
}

.download-app-header img {
  width: 64px;
  height: 64px;
  border-radius: 14px;
}

.download-app-header h2 {
  font-size: 1.6rem;
}

.download-app-header p {
  color: var(--fg-muted);
  font-size: 0.95rem;
  margin-top: 4px;
}

.download-table {
  width: 100%;
  border-collapse: collapse;
}

.download-table th {
  text-align: left;
  padding: 12px 16px;
  color: var(--fg-muted);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.download-table td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: middle;
}

.download-table tr:last-child td { border-bottom: none; }

.platform-cell {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 500;
}

.platform-icon {
  width: 20px;
  height: 20px;
  opacity: 0.7;
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  border-radius: 8px;
  background: rgba(0, 202, 245, 0.1);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  border: 1px solid rgba(0, 202, 245, 0.2);
  transition: all var(--transition);
}

.btn-download:hover {
  background: rgba(0, 202, 245, 0.2);
  border-color: rgba(0, 202, 245, 0.4);
  color: var(--accent-cyan);
  transform: translateY(-1px);
}

/* ── App Landing Pages ────────────────────────────────────────── */
.app-hero {
  min-height: 70vh;
  padding-top: calc(var(--nav-h) + 60px);
}

.app-hero-header {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 24px;
}

.app-hero-icon {
  width: 80px;
  height: 80px;
  border-radius: 18px;
}

.app-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius);
  padding: 28px;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.feature-card p {
  color: var(--fg-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ── Footer ───────────────────────────────────────────────────── */
.footer {
  padding: 60px 0 40px;
  border-top: 1px solid rgba(255,255,255,0.06);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--fg-muted);
  font-size: 0.9rem;
}

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

.footer-copy {
  color: var(--fg-muted);
  font-size: 0.8rem;
  opacity: 0.6;
}

/* ── Utilities ────────────────────────────────────────────────── */
.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-cyan);
  margin-bottom: 16px;
  padding: 6px 14px;
  background: rgba(0, 202, 245, 0.08);
  border-radius: 20px;
  border: 1px solid rgba(0, 202, 245, 0.15);
}

.section-desc {
  color: var(--fg-muted);
  font-size: 1.1rem;
  max-width: 640px;
  line-height: 1.7;
}

/* ── Animations ───────────────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 640px) {
  section { padding: 80px 0; }
  .apps-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 300px; justify-content: center; }
  .download-app { padding: 24px; }
  .download-table th:last-child,
  .download-table td:last-child { text-align: right; }
}