/* ============================================================
   Kairon Browser — Minimalist Luxury Design System
   Philosophy: Modern luxury. Intentional whitespace, premium grids,
               tactile interactions, and motion-first animations.
   Palette: Velvet Dark (#080809) / Museum Light (#F6F6F9)
   ============================================================ */

:root {
  --bg-rgb: 8, 8, 9;
  --bg: rgb(var(--bg-rgb));
  --surface: #101012;
  --surface-2: #161619;
  --surface-3: #222226;
  --border: rgba(255, 255, 255, 0.055);
  --border-hover: rgba(255, 255, 255, 0.12);
  --text-rgb: 252, 252, 253;
  --text: rgb(var(--text-rgb));
  --text-2: rgba(255, 255, 255, 0.85);
  --text-mute: rgba(255, 255, 255, 0.55);
  --text-faint: rgba(255, 255, 255, 0.3);
  --accent: #ffffff;
  --radius: 20px;
  --radius-sm: 12px;
  --radius-lg: 28px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 30px 60px rgba(0, 0, 0, 0.6);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-soft: cubic-bezier(0.22, 1, 0.36, 1);
  --page-transition: 420ms var(--ease-out);
}

html.light {
  --bg-rgb: 246, 246, 249;
  --bg: rgb(var(--bg-rgb));
  --surface: #ffffff;
  --surface-2: #efeee8;
  --surface-3: #e2e1d7;
  --border: rgba(0, 0, 0, 0.06);
  --border-hover: rgba(0, 0, 0, 0.14);
  --text-rgb: 18, 18, 18;
  --text: rgb(var(--text-rgb));
  --text-2: rgba(0, 0, 0, 0.8);
  --text-mute: rgba(0, 0, 0, 0.5);
  --text-faint: rgba(0, 0, 0, 0.3);
  --accent: #000000;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 30px 60px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  height: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  min-height: 100%;
  position: relative;
  opacity: 0; /* Start hidden for fade-in on load */
  transform: translate3d(0, 8px, 0);
  transition:
    opacity var(--page-transition),
    transform var(--page-transition),
    background 0.6s var(--ease-out),
    color 0.6s var(--ease-out);
}

/* Page is visible when loaded */
body.is-loaded {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

/* Fading out class */
body.is-fading-out {
  opacity: 0;
  transform: translate3d(0, -6px, 0);
  pointer-events: none;
}

/* Respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  body {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ── Custom Scrollbar ─────────────────────────────────────── */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg);
}
::-webkit-scrollbar-thumb {
  background: var(--border-hover);
  border-radius: 99px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-faint);
}

/* ── Background Grids & Ambient Effects ─────────────────────── */
.grid-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-size: 60px 60px;
  background-image: 
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  pointer-events: none;
  opacity: 0.5;
  transform: translateZ(0);
  transition: opacity 0.6s ease, transform 1.2s var(--ease-out);
}
body.is-loaded .grid-bg {
  transform: translate3d(0, -8px, 0);
}

#luxury-canvas {
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  background: var(--bg);
  transition: background 0.6s ease;
}

.ambient-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(circle 600px at var(--mouse-x, 50%) var(--mouse-y, 30%), rgba(255,255,255,0.035), transparent 80%);
  pointer-events: none;
  z-index: -1;
  opacity: 0.8;
  transform: scale(1.04);
  transition: opacity 0.8s var(--ease-out), transform 1.4s var(--ease-out);
}
body.is-loaded .ambient-glow {
  transform: scale(1);
}
html.light .ambient-glow {
  background: radial-gradient(circle 600px at var(--mouse-x, 50%) var(--mouse-y, 30%), rgba(0,0,0,0.015), transparent 80%);
}

/* ── Typography & Layout ──────────────────────────────────── */
.font-display {
  font-family: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  letter-spacing: -0.025em;
}
.font-mono {
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
}

h1, h2, h3, h4 {
  color: var(--text);
  font-weight: 600;
  line-height: 1.15;
}

/* Luxury text gradient */
.text-gradient {
  background: linear-gradient(180deg, var(--text) 30%, rgba(var(--text-rgb), 0.65) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.kr-text   { color: var(--text); }
.kr-text-2 { color: var(--text-2); }
.kr-muted  { color: var(--text-mute); }
.kr-faint  { color: var(--text-faint); }
.kr-border { border-color: var(--border); }
.kr-surface   { background: var(--surface); }
.kr-surface-2 { background: var(--surface-2); }

.section-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-mute);
  display: inline-block;
  border-bottom: 1px solid var(--border);
  padding-bottom: 4px;
}

/* ── Selection & Focus ────────────────────────────────────── */
::selection {
  background: rgba(var(--text-rgb), 0.1);
  color: var(--text);
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 1.5px solid var(--text);
  outline-offset: 4px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--text);
  color: var(--bg);
  padding: 0.6rem 1.2rem;
  z-index: 200;
  border-radius: 0 0 10px 0;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

/* ── Header glass styling ─────────────────────────────────── */
header {
  transform: translate3d(0, -8px, 0);
  opacity: 0;
  transition: background 0.4s var(--ease-out),
              border-color 0.4s var(--ease-out),
              box-shadow 0.4s var(--ease-out),
              opacity 0.5s var(--ease-out),
              transform 0.5s var(--ease-out) !important;
}
body.is-loaded header {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}
header.scrolled {
  background: rgba(var(--bg-rgb), 0.8) !important;
  box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.1);
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn-primary {
  background: var(--text);
  color: var(--bg);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: -0.01em;
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 1px solid transparent;
  transition: color 0.3s var(--ease-out),
              background 0.3s var(--ease-out),
              border-color 0.3s var(--ease-out),
              transform 0.3s var(--ease-out),
              box-shadow 0.3s var(--ease-out);
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
  pointer-events: none;
}
html.light .btn-primary::after {
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-primary:hover::after {
  left: 100%;
  transition: left 1s ease-in-out;
}
.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-secondary {
  background: transparent;
  color: var(--text-2);
  border: 1px solid var(--border);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: -0.01em;
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.75rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.3s var(--ease-out),
              background 0.3s var(--ease-out),
              border-color 0.3s var(--ease-out),
              transform 0.3s var(--ease-out),
              box-shadow 0.3s var(--ease-out);
  text-decoration: none;
  line-height: 1;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
}

.btn-secondary:hover {
  border-color: var(--border-hover);
  color: var(--text);
  background: rgba(var(--text-rgb), 0.02);
  transform: translateY(-1px);
}
.btn-secondary:active {
  transform: translateY(0) scale(0.98);
}

/* Theme Toggle Button Spin */
#theme-toggle {
  transition: color 0.3s var(--ease-out),
              background 0.3s var(--ease-out),
              transform 0.45s var(--ease-out);
}
#theme-toggle:hover {
  transform: rotate(20deg);
  color: var(--text);
  background: rgba(var(--text-rgb), 0.05);
}
#theme-toggle:active {
  transform: scale(0.92);
}

/* ── Cards & spotlight hover ──────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.45s var(--ease-out),
              background 0.45s var(--ease-out),
              transform 0.45s var(--ease-out),
              box-shadow 0.45s var(--ease-out);
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: radial-gradient(
    400px circle at var(--mouse-x, 0px) var(--mouse-y, 0px),
    rgba(255, 255, 255, 0.09),
    transparent 45%
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s var(--ease-out);
  z-index: 1;
}

html.light .card::before {
  background: radial-gradient(
    400px circle at var(--mouse-x, 0px) var(--mouse-y, 0px),
    rgba(0, 0, 0, 0.06),
    transparent 45%
  );
}

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

.card:where(a, [role="link"]):hover,
.card-hover:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.card-shine {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    500px circle at var(--mouse-x, 0px) var(--mouse-y, 0px),
    rgba(255, 255, 255, 0.015),
    transparent 60%
  );
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.5s ease;
  z-index: 0;
}
html.light .card-shine {
  background: radial-gradient(
    500px circle at var(--mouse-x, 0px) var(--mouse-y, 0px),
    rgba(0, 0, 0, 0.005),
    transparent 60%
  );
}
.card:hover .card-shine {
  opacity: 1;
}

/* ── 3D Mockup Container ───────────────────────────────────── */
.mockup-container {
  perspective: 1500px;
  position: relative;
}

.mockup-inner {
  transform-style: preserve-3d;
  transition: transform 0.55s var(--ease-out),
              box-shadow 0.55s var(--ease-out);
  box-shadow: var(--shadow-lg);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
}

.mockup-inner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.06) 0%, transparent 60%);
  pointer-events: none;
  z-index: 2;
}

/* ── Reveal Animations ─────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translate3d(0, 28px, 0);
  transition: opacity 0.9s var(--ease-soft),
              transform 0.9s var(--ease-soft);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.reveal-scale {
  opacity: 0;
  transform: translate3d(0, 26px, 0) scale(0.975);
  transition: opacity 1s var(--ease-soft),
              transform 1s var(--ease-soft);
  transition-delay: var(--reveal-delay, 0ms);
  will-change: opacity, transform;
}

.reveal.revealed,
.reveal-scale.revealed {
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
  will-change: auto;
}

.delay-100 { --reveal-delay: 0.1s; }
.delay-200 { --reveal-delay: 0.2s; }
.delay-300 { --reveal-delay: 0.3s; }
.delay-400 { --reveal-delay: 0.4s; }
.delay-500 { --reveal-delay: 0.5s; }

/* ── Subtle elements ──────────────────────────────────────── */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.2s ease, gap 0.2s ease;
}
.link-arrow:hover {
  color: var(--text);
  gap: 0.6rem;
}

.platform-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  color: var(--text-mute);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 99px;
  padding: 0.35rem 0.85rem;
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: -0.01em;
}

.blog-featured {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
  text-decoration: none;
  display: block;
}
.blog-featured:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.blog-featured:hover .blog-thumb {
  transform: scale(1.03);
}

.blog-thumb {
  transition: transform 0.6s var(--ease-out);
}

/* ── Dividers & Borders ───────────────────────────────────── */
.kr-divider {
  border: none;
  border-top: 1px solid var(--border);
}

/* ── Custom Interactive Details ────────────────────────────── */
.active-nav-indicator {
  position: absolute;
  bottom: 0;
  height: 2px;
  background: var(--text);
  transition: all 0.3s var(--ease-out);
  pointer-events: none;
}

#mobile-menu {
  opacity: 0;
  transform: translate3d(0, -8px, 0);
  transition: opacity 0.28s var(--ease-out), transform 0.28s var(--ease-out);
}

#mobile-menu.is-open {
  opacity: 1;
  transform: translate3d(0, 0, 0);
}

#mobile-menu a {
  transform: translate3d(0, -4px, 0);
  transition: color 0.25s var(--ease-out), transform 0.32s var(--ease-out), opacity 0.32s var(--ease-out);
}

#mobile-menu.is-open a {
  transform: translate3d(0, 0, 0);
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal-scale,
  #mobile-menu,
  #mobile-menu a,
  .grid-bg,
  .ambient-glow,
  header {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* ── Redesign 2.0: Design System Extensions ───────────────── */

:root {
  /* 8px Spacing System */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 40px;
  --space-6: 48px;
  --space-8: 64px;
  --space-10: 80px;
  --space-12: 96px;
  --space-16: 128px;
  --space-20: 160px;

  /* Typography Scale Refinement */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;
  --text-8xl: 6rem;
  --text-9xl: 8rem;

  /* Animation Easings */
  --ease-in-out: cubic-bezier(0.77, 0, 0.175, 1);
  --ease-snappy: cubic-bezier(0.23, 1, 0.32, 1);
}

/* ── Typography Enhancements ──────────────────────────────── */
h1, h2, h3 {
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.text-balance {
  text-wrap: balance;
}

/* ── Hero Components ──────────────────────────────────────── */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 99px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-mute);
  margin-bottom: var(--space-4);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.hero-badge .dot {
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
  100% { opacity: 1; transform: scale(1); }
}

/* ── Enhanced Mockup ──────────────────────────────────────── */
.mockup-container {
  max-width: 80rem; /* Increased size */
  margin: 0 auto;
  position: relative;
}

.mockup-glow {
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 60%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
  filter: blur(60px);
  z-index: -1;
  pointer-events: none;
}

.mockup-inner {
  box-shadow: 
    0 0 0 1px var(--border),
    0 4px 6px -1px rgba(0, 0, 0, 0.2),
    0 20px 40px -10px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
  border: none;
}

.is-floating {
  animation: float 6s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotateX(0) rotateY(0); }
  50% { transform: translateY(-12px) rotateX(1deg) rotateY(-0.5deg); }
}

/* ── Enhanced Cards ───────────────────────────────────────── */
.card {
  border-radius: var(--radius-lg);
  box-shadow: 
    0 4px 12px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.card-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 14px;
  margin-bottom: var(--space-4);
  color: var(--text);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* ── Privacy Section Components ───────────────────────────── */
.privacy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (min-width: 1024px) {
  .privacy-grid {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.trust-stat {
  padding: var(--space-4);
  border-left: 1px solid var(--border);
}

.trust-stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.trust-stat-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}

/* ── Blog Card Enhancements ───────────────────────────────── */
.blog-card-thumb {
  aspect-ratio: 16/9;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.blog-card-thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent 40%, rgba(255, 255, 255, 0.03) 50%, transparent 60%);
  background-size: 200% 200%;
  animation: shimmer 8s linear infinite;
}

@keyframes shimmer {
  0% { background-position: -200% -200%; }
  100% { background-position: 200% 200%; }
}

/* ── CTA Card Enhancements ────────────────────────────────── */
.cta-card {
  position: relative;
  background: #0a0a0c;
  border: 1px solid var(--border);
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
}

/* ── Button Upgrades ──────────────────────────────────────── */
.btn-primary-lg {
  padding: 1rem 2.25rem;
  font-size: var(--text-base);
}

.btn-icon {
  width: 18px;
  height: 18px;
}

/* ── Footer Polish ────────────────────────────────────────── */
footer a {
  transition: transform 0.2s var(--ease-snappy), color 0.2s var(--ease-snappy);
}

footer a:hover {
  transform: translateX(3px);
  color: var(--text);
}