/* ============================================================
   AI Chat Cloud - Landing Page Styles (landing.css)
   Animated hero, feature cards, FAQ accordion, footer.
   ============================================================ */

/* ---------------- Navbar ---------------- */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) 0;
  transition: all var(--dur) var(--ease);
}
.navbar.scrolled {
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(160%);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  padding: var(--space-3) 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text);
}
.logo-mark {
  width: 38px;
  height: 38px;
  border-radius: var(--r-md);
  background: var(--brand-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--glow);
  flex-shrink: 0;
}
.logo-mark svg { width: 22px; height: 22px; color: #fff; }
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav-links a {
  color: var(--text-2);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color var(--dur) var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: var(--space-3); }

/* ---------------- Hero ---------------- */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px var(--space-5) var(--space-8);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}
.hero-bg .orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.6;
  animation: floatBlob 16s ease-in-out infinite;
}
.orb-1 { width: 400px; height: 400px; background: radial-gradient(circle, #7c3aed, transparent 70%); top: 10%; left: 15%; }
.orb-2 { width: 350px; height: 350px; background: radial-gradient(circle, #06b6d4, transparent 70%); bottom: 15%; right: 15%; animation-delay: -8s; }
.orb-3 { width: 300px; height: 300px; background: radial-gradient(circle, #2563eb, transparent 70%); top: 40%; right: 30%; animation-delay: -4s; }

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  z-index: -1;
}

.hero-content { max-width: 820px; animation: fadeInUp 0.8s var(--ease) both; }
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 14px;
  border-radius: var(--r-full);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: var(--space-5);
  backdrop-filter: blur(10px);
}
.hero-badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
  animation: pulse 2s infinite;
}
.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-5);
}
.hero h1 .gradient-text { display: inline-block; }
.hero p.lead {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--text-2);
  max-width: 620px;
  margin: 0 auto var(--space-6);
  line-height: 1.6;
}
.hero-cta {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-6);
}
.hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
  flex-wrap: wrap;
  color: var(--text-3);
  font-size: 0.85rem;
}
.hero-trust span { display: inline-flex; align-items: center; gap: 6px; }
.hero-trust svg { width: 16px; height: 16px; color: var(--success); }

/* Floating preview card */
.hero-preview {
  margin-top: var(--space-8);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
  perspective: 1200px;
  animation: fadeInUp 1s var(--ease) 0.3s both;
}
.preview-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-xl);
  padding: var(--space-5);
  box-shadow: var(--shadow-lg);
  transform: rotateX(8deg);
  transform-origin: center top;
  transition: transform 0.4s var(--ease);
}
.preview-card:hover { transform: rotateX(0deg) translateY(-4px); }
.preview-head { display: flex; gap: 8px; margin-bottom: var(--space-4); }
.preview-dot { width: 12px; height: 12px; border-radius: 50%; }
.preview-dot.r { background: #ff5f57; }
.preview-dot.y { background: #febc2e; }
.preview-dot.g { background: #28c840; }
.preview-body { text-align: left; }
.preview-msg { display: flex; gap: var(--space-3); margin-bottom: var(--space-4); }
.preview-msg.user { flex-direction: row-reverse; }
.preview-avatar {
  width: 32px; height: 32px; border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.preview-msg.assistant .preview-avatar { background: var(--brand-gradient); color: #fff; }
.preview-msg.user .preview-avatar { background: var(--surface-2); color: var(--text-2); }
.preview-avatar svg { width: 18px; height: 18px; }
.preview-bubble {
  padding: 10px 14px;
  border-radius: var(--r-md);
  max-width: 70%;
  font-size: 0.9rem;
  line-height: 1.5;
}
.preview-msg.assistant .preview-bubble { background: var(--surface-2); border: 1px solid var(--border); }
.preview-msg.user .preview-bubble { background: var(--brand-gradient); color: #fff; }
.preview-typing { display: inline-flex; gap: 4px; padding: 4px 0; }
.preview-typing span {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--text-3);
  animation: typingBounce 1.2s infinite;
}
.preview-typing span:nth-child(2) { animation-delay: 0.2s; }
.preview-typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ---------------- Sections ---------------- */

.section { padding: var(--space-8) 0; }
.section-head { text-align: center; max-width: 680px; margin: 0 auto var(--space-8); }
.section-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-3);
}
.section-head h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.section-head p { color: var(--text-2); font-size: 1.05rem; }

/* ---------------- Feature Cards ---------------- */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-5);
}
.feature-card {
  padding: var(--space-6);
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: all 0.35s var(--ease);
  position: relative;
  overflow: hidden;
}
.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--brand-gradient-soft);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}
.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}
.feature-card:hover::before { opacity: 1; }
.feature-card > * { position: relative; z-index: 1; }
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--r-md);
  background: var(--brand-gradient-soft);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  margin-bottom: var(--space-4);
}
.feature-icon svg { width: 24px; height: 24px; }
.feature-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: var(--space-2); }
.feature-card p { color: var(--text-2); font-size: 0.95rem; }

/* ---------------- Models Strip ---------------- */

.models-strip {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-6);
}
.model-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 8px 16px;
  border-radius: var(--r-full);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-2);
  transition: all var(--dur) var(--ease);
}
.model-chip:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
}
.model-chip .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* ---------------- Steps ---------------- */

.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-5);
  counter-reset: step;
}
.step-card {
  padding: var(--space-6);
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  position: relative;
}
.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  border-radius: var(--r-md);
  background: var(--brand-gradient);
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  margin-bottom: var(--space-4);
  box-shadow: var(--glow);
}
.step-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: var(--space-2); }
.step-card p { color: var(--text-2); font-size: 0.92rem; }

/* ---------------- FAQ ---------------- */

.faq-list { max-width: 760px; margin: 0 auto; }
.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  margin-bottom: var(--space-3);
  overflow: hidden;
  background: var(--surface);
  transition: border-color var(--dur) var(--ease);
}
.faq-item.open { border-color: var(--border-strong); }
.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-5);
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}
.faq-icon {
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-2);
  transition: transform var(--dur) var(--ease);
  flex-shrink: 0;
}
.faq-item.open .faq-icon { transform: rotate(45deg); color: var(--accent); }
.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease);
}
.faq-answer-inner {
  padding: 0 var(--space-5) var(--space-4);
  color: var(--text-2);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ---------------- CTA Banner ---------------- */

.cta-banner {
  text-align: center;
  padding: var(--space-8) var(--space-6);
  border-radius: var(--r-xl);
  background: var(--brand-gradient-soft);
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
}
.cta-banner h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  margin-bottom: var(--space-3);
}
.cta-banner p { color: var(--text-2); margin-bottom: var(--space-5); font-size: 1.05rem; }

/* ---------------- Footer ---------------- */

.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-8) 0 var(--space-5);
  margin-top: var(--space-8);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}
.footer-brand p { color: var(--text-2); font-size: 0.9rem; margin-top: var(--space-3); max-width: 320px; }
.footer-col h4 { font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-3); margin-bottom: var(--space-3); }
.footer-col a { display: block; color: var(--text-2); font-size: 0.9rem; margin-bottom: var(--space-2); }
.footer-col a:hover { color: var(--text); }
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  color: var(--text-3);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* ---------------- Mobile Nav ---------------- */

.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: var(--r-md);
  align-items: center; justify-content: center;
  color: var(--text);
}
.nav-toggle svg { width: 24px; height: 24px; }

/* ---------------- Responsive ---------------- */

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: var(--space-4);
    right: var(--space-4);
    padding: var(--space-5);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--r-lg);
    box-shadow: var(--shadow);
  }
  .hero { padding-top: 100px; }
  .preview-card { transform: none; }
  .footer-grid { grid-template-columns: 1fr; }
}