/* ============================================================
   XPERYN — Main Stylesheet
   Dark luxury AI startup aesthetic
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:        #080808;
  --bg-2:      #0d0d0d;
  --bg-3:      #111111;
  --surface:   #161616;
  --surface-2: #1c1c1c;
  --border:    rgba(255,255,255,0.07);
  --border-2:  rgba(255,255,255,0.12);
  --text:      #f0f0f0;
  --text-2:    #a0a0a0;
  --text-3:    #606060;
  --accent:    #4f8ef7;
  --accent-2:  #7c5cfc;
  --accent-glow: rgba(79,142,247,0.15);
  --font: 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', monospace;
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }

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

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================================
   NAVBAR
   ============================================================ */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 24px;
  transition: background var(--transition), border-color var(--transition);
}

#navbar.scrolled {
  background: rgba(8,8,8,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--text);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
  margin-left: auto;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-2);
  transition: color var(--transition);
  letter-spacing: 0.01em;
}

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

.nav-cta {
  font-size: 13px;
  font-weight: 500;
  padding: 8px 20px;
  border: 1px solid var(--border-2);
  border-radius: 100px;
  color: var(--text);
  transition: background var(--transition), border-color var(--transition);
  flex-shrink: 0;
}

.nav-cta:hover {
  background: var(--surface-2);
  border-color: rgba(255,255,255,0.2);
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: var(--transition);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: var(--text);
  color: var(--bg);
  font-size: 14px;
  font-weight: 600;
  border-radius: 100px;
  transition: opacity var(--transition), transform var(--transition);
  letter-spacing: 0.01em;
}

.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border: 1px solid var(--border-2);
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  border-radius: 100px;
  transition: color var(--transition), border-color var(--transition), transform var(--transition);
}

.btn-ghost:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.25);
  transform: translateY(-1px);
}

.btn-large { padding: 16px 36px; font-size: 15px; }

/* ============================================================
   HERO
   ============================================================ */
#hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 24px 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.18;
}

.glow-1 {
  width: 600px; height: 600px;
  background: var(--accent);
  top: -100px; left: -100px;
}

.glow-2 {
  width: 500px; height: 500px;
  background: var(--accent-2);
  bottom: -50px; right: -50px;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 640px;
  flex: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-2);
  border: 1px solid var(--border);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 32px;
}

.hero-headline {
  font-size: clamp(40px, 5.5vw, 72px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
  color: var(--text);
}

.hero-sub {
  font-size: 18px;
  color: var(--text-2);
  line-height: 1.65;
  max-width: 520px;
  margin-bottom: 40px;
}

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

.hero-visual {
  position: relative;
  z-index: 2;
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  padding-left: 60px;
}

.hero-card-stack {
  position: relative;
  width: 320px;
  height: 320px;
}

.hcard {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-2);
  backdrop-filter: blur(10px);
  white-space: nowrap;
  animation: float 6s ease-in-out infinite;
}

.hcard-icon { font-size: 16px; }

.hcard-1 { top: 20px; left: 0; animation-delay: 0s; }
.hcard-2 { top: 80px; right: 0; animation-delay: 1.5s; }
.hcard-3 { bottom: 80px; left: 20px; animation-delay: 3s; }
.hcard-4 { bottom: 20px; right: 20px; animation-delay: 4.5s; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.scroll-hint {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-3);
  z-index: 2;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--text-3), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* ============================================================
   TAGLINE STRIP
   ============================================================ */
.tagline-strip {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  overflow: hidden;
}

.strip-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-3);
  padding: 0 24px;
}

.dot { color: var(--accent); opacity: 0.6; }

/* ============================================================
   SECTION COMMONS
   ============================================================ */
.section-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin-bottom: 20px;
}

.section-desc {
  font-size: 17px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 640px;
}

/* ============================================================
   PLATFORM SECTION
   ============================================================ */
.section-platform {
  padding: 120px 0;
  background: var(--bg-2);
}

.section-platform .container {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.platform-image-wrap {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

.platform-img {
  width: 100%;
  height: auto;
  display: block;
  filter: brightness(0.85) saturate(1.1);
}

.platform-img-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 60%, var(--bg-2) 100%);
}

/* ============================================================
   CAPABILITIES
   ============================================================ */
.section-capabilities {
  padding: 120px 0;
  background: var(--bg);
}

.section-capabilities .container {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.cap-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.cap-card {
  background: var(--bg);
  padding: 40px 36px;
  transition: background var(--transition);
}

.cap-card:hover { background: var(--surface); }

.cap-icon-wrap {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  color: var(--accent);
  margin-bottom: 24px;
}

.cap-card h3 {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 12px;
  color: var(--text);
}

.cap-card p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
}

/* ============================================================
   WHO IT'S FOR
   ============================================================ */
.section-who {
  padding: 120px 0;
  background: var(--bg-2);
}

.section-who .container {
  display: flex;
  flex-direction: column;
  gap: 60px;
}

.who-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.who-card {
  padding: 40px 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: border-color var(--transition), transform var(--transition);
}

.who-card:hover {
  border-color: var(--border-2);
  transform: translateY(-4px);
}

.who-number {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 20px;
  font-family: var(--font-mono);
}

.who-card h3 {
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}

.who-card p {
  font-size: 14px;
  color: var(--text-2);
  line-height: 1.65;
}

/* ============================================================
   ABOUT
   ============================================================ */
.section-about {
  padding: 120px 0;
  background: var(--bg);
}

.about-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-image-wrap {
  margin-top: 40px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 1;
  max-width: 360px;
}

.about-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: brightness(0.8) saturate(1.1);
}

.about-body {
  font-size: 16px;
  color: var(--text-2);
  line-height: 1.75;
  margin-bottom: 20px;
}

.about-stats {
  display: flex;
  gap: 40px;
  margin-top: 48px;
  padding-top: 40px;
  border-top: 1px solid var(--border);
}

.stat-value {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 12px;
  color: var(--text-3);
  margin-top: 4px;
  letter-spacing: 0.04em;
}

/* ============================================================
   MISSION / VISION
   ============================================================ */
.section-mission {
  padding: 80px 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.mission-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.mission-card {
  background: var(--bg-2);
  padding: 48px 40px;
}

.mission-card-center {
  background: var(--surface);
}

.mission-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}

.mission-card p {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.7;
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.section-cta {
  padding: 160px 0;
  background: var(--bg);
  overflow: hidden;
}

.cta-inner {
  position: relative;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(79,142,247,0.12) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.cta-inner h2 {
  font-size: clamp(36px, 4.5vw, 56px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin-bottom: 20px;
}

.cta-inner p {
  font-size: 18px;
  color: var(--text-2);
  margin-bottom: 40px;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  padding: 60px 0 32px;
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 60px;
  margin-bottom: 48px;
}

.footer-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.12em;
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 13px;
  color: var(--text-3);
}

.footer-links {
  display: flex;
  gap: 60px;
}

.footer-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-col-title {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 4px;
}

.footer-col a {
  font-size: 14px;
  color: var(--text-2);
  transition: color var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-3);
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .cap-grid { grid-template-columns: repeat(2, 1fr); }
  .about-split { grid-template-columns: 1fr; gap: 48px; }
  .about-image-wrap { max-width: 100%; aspect-ratio: 16/9; }
  .hero-visual { display: none; }
}

@media (max-width: 768px) {
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }

  #hero { padding: 100px 24px 80px; }
  .hero-headline { font-size: 38px; }
  .hero-sub { font-size: 16px; }

  .cap-grid { grid-template-columns: 1fr; }
  .who-grid { grid-template-columns: 1fr; }
  .mission-grid { grid-template-columns: 1fr; }

  .about-stats { flex-direction: column; gap: 24px; }

  .footer-top { flex-direction: column; gap: 40px; }
  .footer-links { gap: 40px; }
  .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }

  .strip-inner { gap: 16px; }
  .dot { display: none; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-ghost { width: 100%; justify-content: center; }
  .section-title { font-size: 28px; }
}