/* ============================================
   CMD+K Showcase -- main.css
   Design tokens, reset, nav, footer, buttons,
   scroll animations, utilities, responsive
   ============================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---------- Design Tokens ---------- */
:root {
  /* Colours -- dark (default) */
  --bg-primary:    #000000;
  --bg-secondary:  #0a0a0a;
  --bg-card:       #111111;
  --bg-card-hover: #1a1a1a;
  --bg-code:       #0d0d0d;
  --bg-nav:        rgba(0, 0, 0, 0.85);

  --text-primary:   #f5f5f5;
  --text-secondary: #a0a0a0;
  --text-muted:     #666666;

  --accent:         #ffffff;
  --accent-hover:   #d4d4d4;
  --accent-subtle:  rgba(255, 255, 255, 0.06);
  --accent-fg:      #000000;

  --border:         #1a1a1a;
  --border-hover:   #333333;

  --shadow-sm:   0 1px 2px rgba(0,0,0,0.4);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.5);
  --shadow-lg:   0 8px 30px rgba(0,0,0,0.6);
  --shadow-glow: 0 0 30px rgba(255,255,255,0.06);

  /* Spacing */
  --nav-height: 64px;
  --section-gap: 120px;
  --container-max: 1120px;
  --container-padding: 24px;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 0.15s;
  --duration-normal: 0.3s;
  --duration-slow: 0.6s;

  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
}

/* ---------- Light theme ---------- */
[data-theme="light"] {
  --bg-primary:    #ffffff;
  --bg-secondary:  #f8f8f8;
  --bg-card:       #ffffff;
  --bg-card-hover: #f5f5f5;
  --bg-code:       #f4f4f4;
  --bg-nav:        rgba(255, 255, 255, 0.9);

  --text-primary:   #111111;
  --text-secondary: #555555;
  --text-muted:     #999999;

  --accent:         #111111;
  --accent-hover:   #333333;
  --accent-subtle:  rgba(0, 0, 0, 0.04);
  --accent-fg:      #ffffff;

  --border:         #e5e5e5;
  --border-hover:   #cccccc;

  --shadow-sm:   0 1px 2px rgba(0,0,0,0.06);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg:   0 8px 30px rgba(0,0,0,0.1);
  --shadow-glow: 0 0 30px rgba(0,0,0,0.04);
}

/* ---------- Logo theme switching ---------- */
.logo-light { display: none; }
.logo-dark  { display: block; }

[data-theme="light"] .logo-light { display: block; }
[data-theme="light"] .logo-dark  { display: none; }

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out);
}

a {
  color: inherit;
  text-decoration: none;
}

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

ul, ol { list-style: none; }

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

/* ---------- Container ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ---------- Nav ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-nav);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.nav.scrolled {
  box-shadow: var(--shadow-md);
}

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

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.nav-brand img {
  width: 42px;
  height: 42px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--duration-fast);
  position: relative;
}

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

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--duration-normal) var(--ease-out);
  border-radius: 1px;
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.nav-cta {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 18px;
  background: var(--accent);
  color: var(--accent-fg) !important;
  border-radius: var(--radius-full);
  transition: background var(--duration-fast), transform var(--duration-fast);
}

.nav-cta:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
}

.nav-cta::after { display: none !important; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
  cursor: pointer;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast);
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: var(--radius-full);
  padding: 12px 28px;
  transition: all var(--duration-normal) var(--ease-out);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-fg);
  border: none;
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,255,255,0.15);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ---------- Section label ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-label::before {
  content: '';
  width: 20px;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
}

/* ---------- Section title / subtitle ---------- */
.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
}

/* ---------- Scroll reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }
.reveal-delay-6 { transition-delay: 0.6s; }

/* ---------- Theme toggle ---------- */
.theme-toggle {
  position: fixed;
  bottom: 24px;
  left: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  transition: all var(--duration-normal) var(--ease-out);
  box-shadow: var(--shadow-md);
}

.theme-toggle:hover {
  border-color: var(--accent);
  transform: scale(1.1);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  color: var(--text-secondary);
  transition: color var(--duration-fast);
}

.theme-toggle:hover svg {
  color: var(--accent);
}

.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* ---------- Footer ---------- */
.footer {
  margin-top: var(--section-gap);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
  transition: border-color var(--duration-normal) var(--ease-out);
}

.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
}

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

.footer-brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
}

.footer-brand-logo img {
  width: 48px;
  height: 48px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 300px;
}

.footer-col h4 {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 4px 0;
  transition: color var(--duration-fast);
}

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

.footer-bottom {
  max-width: var(--container-max);
  margin: 48px auto 0;
  padding: 24px var(--container-padding) 0;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer-bottom a {
  color: var(--text-secondary);
  transition: color var(--duration-fast);
}

.footer-bottom a:hover {
  color: var(--accent);
}

/* ---------- Kbd ---------- */
kbd {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 3px 7px;
  border-radius: 5px;
  background: var(--bg-card);
  border: 1px solid var(--border-hover);
  box-shadow: 0 1px 0 var(--border-hover);
  color: var(--text-secondary);
  line-height: 1;
  vertical-align: middle;
}

/* ---------- Utilities ---------- */
.text-accent { color: var(--accent); }
.text-center { text-align: center; }
.mx-auto { margin-left: auto; margin-right: auto; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  :root {
    --section-gap: 80px;
    --container-padding: 20px;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 80px 28px 28px;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out);
    box-shadow: var(--shadow-lg);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1rem;
    padding: 12px 0;
    width: 100%;
    border-bottom: 1px solid var(--border);
  }

  .nav-links a::after { display: none; }

  .nav-cta {
    margin-top: 16px;
    text-align: center;
    width: 100%;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

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

@media (max-width: 480px) {
  :root {
    --container-padding: 16px;
  }

  .btn {
    padding: 11px 22px;
    font-size: 0.9rem;
  }
}

/* ---------- Mobile overlay backdrop ---------- */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 998;
}

.nav-overlay.open {
  display: block;
}

/* ---------- Mobile Gate ---------- */
#mobile-gate {
  display: none;
}

@keyframes mobileGateSlideUp {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes morphScreen {
  0%, 15% {
    width: 22px;
    height: 36px;
    border-radius: 6px;
  }
  35%, 65% {
    width: 52px;
    height: 34px;
    border-radius: 3px;
  }
  85%, 100% {
    width: 22px;
    height: 36px;
    border-radius: 6px;
  }
}

@keyframes morphArrows {
  0%, 15% {
    opacity: 0;
    transform: translateX(0);
  }
  25%, 50% {
    opacity: 1;
    transform: translateX(var(--arrow-dir, 4px));
  }
  70%, 100% {
    opacity: 0;
    transform: translateX(0);
  }
}

@media (max-width: 768px) {
  #mobile-gate {
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: var(--bg-primary);
    align-items: center;
    justify-content: center;
    padding: 24px;
  }

  body > *:not(#mobile-gate) {
    display: none !important;
  }

  .mobile-gate-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
    padding: 48px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 360px;
    width: 100%;
    animation: mobileGateSlideUp 0.8s var(--ease-out) both;
  }

  .mobile-gate-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--accent-subtle);
    color: var(--accent);
  }

  .morph-device {
    position: relative;
    display: flex;
    flex-direction: row;
    align-items: center;
  }

  .morph-screen {
    width: 22px;
    height: 36px;
    border: 2px solid var(--accent);
    border-radius: 6px;
    animation: morphScreen 5s ease-in-out infinite;
  }

  .morph-arrow {
    width: 2px;
    height: 8px;
    background: var(--accent);
    border-radius: 1px;
    opacity: 0;
    animation: morphArrows 5s ease-in-out infinite;
  }

  .morph-arrow-left {
    --arrow-dir: -4px;
    margin-right: 3px;
  }

  .morph-arrow-right {
    --arrow-dir: 4px;
    margin-left: 3px;
  }

  .mobile-gate-text {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    line-height: 1.7;
    text-align: left;
  }

  .mobile-gate-sig {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--text-muted);
  }

  .mobile-gate-footer {
    position: absolute;
    bottom: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
  }

  .mobile-gate-brand img {
    width: 32px;
    height: 32px;
  }

  .mobile-gate-version {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
  }
}

@media (prefers-reduced-motion: reduce) {
  .mobile-gate-card {
    animation: none;
  }
  .morph-screen {
    animation: none;
    width: 52px;
    height: 34px;
    border-radius: 3px;
  }
  .morph-arrow {
    animation: none;
    opacity: 0;
  }
}