/* V2V-Zero Project Site · dark mode / glassmorphism / tech */

:root {
  /* Dark gradient backgrounds */
  --bg: linear-gradient(180deg, #0a0a0f 0%, #12121a 100%);
  --bg-solid: #0f0f15;
  --bg-soft: rgba(255, 255, 255, 0.02);
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-elevated: rgba(255, 255, 255, 0.05);

  /* Text colors */
  --ink: #e8e8ea;
  --ink-muted: #a0a0a5;
  --ink-subtle: #6a6a6f;

  /* Lines & borders */
  --line: rgba(255, 255, 255, 0.08);
  --line-soft: rgba(255, 255, 255, 0.04);

  /* Accent colors */
  --accent: #0084ff;
  --accent-glow: rgba(0, 132, 255, 0.3);
  --accent-soft: rgba(0, 132, 255, 0.12);

  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-blur: blur(20px) saturate(180%);

  /* Typography */
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;
  --serif: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;

  /* Layout */
  --max: 1280px;
  --pad: 2rem;
  --radius: 8px;
  --dur: 0.4s;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}

body {
  font-family: var(--sans);
  background: var(--bg-solid);
  background-image: var(--bg);
  background-attachment: fixed;
  color: var(--ink);
  line-height: 1.6;
  font-feature-settings: "ss01", "cv01", "cv11", "tnum";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* Navigation */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 15, 21, 0.7);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--line);
  height: 64px;
}

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

.nav-logo {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 12px var(--accent-glow);
  animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 12px var(--accent-glow); }
  50% { box-shadow: 0 0 20px var(--accent-glow), 0 0 30px var(--accent-glow); }
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  align-items: center;
  list-style: none;
}

.nav-links a {
  font-size: 0.88rem;
  color: var(--ink-muted);
  transition: color 0.2s;
  position: relative;
  padding: 0.25rem 0;
}

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

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
}

.nav-right {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.lang-toggle {
  font-family: var(--mono);
  font-size: 0.75rem;
  border: 1px solid var(--line);
  background: var(--bg-card);
  padding: 0.35rem 0.75rem;
  border-radius: 20px;
  cursor: pointer;
  color: var(--ink-muted);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  letter-spacing: 0.05em;
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--ink);
  background: var(--accent-soft);
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
}

.nav-cta {
  background: linear-gradient(135deg, var(--accent) 0%, #0066cc 100%);
  color: white !important;
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 16px rgba(0, 132, 255, 0.2);
}

.nav-cta:hover {
  background: linear-gradient(135deg, #0099ff 0%, var(--accent) 100%);
  box-shadow: 0 6px 24px var(--accent-glow);
  transform: translateY(-2px);
}

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

.container-narrow {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 var(--pad);
}

/* Section basics */
section {
  padding: 6rem 0;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

.section-eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--accent);
  margin-bottom: 1rem;
  display: block;
}

.section-lead {
  font-size: 1.15rem;
  color: var(--ink-muted);
  max-width: 680px;
  line-height: 1.7;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: 24px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent) 0%, #0066cc 100%);
  color: white;
  box-shadow: 0 4px 16px rgba(0, 132, 255, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0099ff 0%, var(--accent) 100%);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
  background: var(--bg-card);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
}

.btn-ghost:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 4px 16px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-icon {
  width: 14px;
  height: 14px;
}

/* Footer */
.footer {
  border-top: 1px solid var(--line);
  padding: 4rem 0 2rem;
  background: var(--bg-soft);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  margin-top: 6rem;
  position: relative;
}

.footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.3;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--ink-muted);
  max-width: 320px;
  line-height: 1.6;
}

.footer-col h5 {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--ink-subtle);
  margin-bottom: 1rem;
  font-weight: 500;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.5rem;
}

.footer-col a {
  font-size: 0.85rem;
  color: var(--ink-muted);
  transition: color 0.2s;
}

.footer-col a:hover {
  color: var(--accent);
  text-shadow: 0 0 8px var(--accent-glow);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--ink-subtle);
  font-family: var(--mono);
}

/* Utilities */
.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.text-accent {
  color: var(--accent);
  text-shadow: 0 0 20px var(--accent-glow);
}

.grid {
  display: grid;
  gap: 2rem;
}

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* Glassmorphism card utility */
.glass-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-card:hover {
  background: var(--bg-elevated);
  border-color: rgba(255, 255, 255, 0.12);
  box-shadow: 0 8px 32px rgba(0, 132, 255, 0.1),
              0 0 0 1px rgba(0, 132, 255, 0.1);
  transform: translateY(-2px);
}

/* Glow effect for numbers and metrics */
.metric-glow {
  font-variant-numeric: tabular-nums;
  text-shadow: 0 0 20px var(--accent-glow);
}

/* Responsive */
@media (max-width: 860px) {
  .nav-links {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  section {
    padding: 4rem 0;
  }
}

/* Scrollbar styling for dark mode */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg-solid);
}

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 5px;
  border: 2px solid var(--bg-solid);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* Selection styling */
::selection {
  background: var(--accent-soft);
  color: var(--ink);
}