/* ═══════════════════════════════════════════════════════════
   VERINASCI — Design System & Styles
   微睿纳思 · The Birthplace of Truth & Insight
═══════════════════════════════════════════════════════════ */

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --bg-base: #040810;
  --bg-surface: #080f1c;
  --bg-elevated: #0c1526;
  --bg-glass: rgba(12, 21, 38, 0.6);

  --cyan: #00D4FF;
  --cyan-dim: rgba(0, 212, 255, 0.15);
  --cyan-glow: rgba(0, 212, 255, 0.4);
  --violet: #7B2FFF;
  --violet-dim: rgba(123, 47, 255, 0.15);
  --violet-glow: rgba(123, 47, 255, 0.4);
  --gold: #FFD166;
  --gold-dim: rgba(255, 209, 102, 0.12);

  --text-primary: #F0F4FF;
  --text-secondary: rgba(240, 244, 255, 0.65);
  --text-muted: rgba(240, 244, 255, 0.35);

  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-glow: rgba(0, 212, 255, 0.2);

  --font-display: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  --font-mono: 'Space Mono', monospace;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;
  --font-cn: 'Noto Sans SC', sans-serif;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;

  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow-cyan: 0 0 40px rgba(0, 212, 255, 0.2);
  --shadow-glow-violet: 0 0 40px rgba(123, 47, 255, 0.2);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);

  --section-padding: 120px 24px;
  --max-width: 1200px;
}

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

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

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  overflow-x: hidden;
  cursor: none;
}

::selection {
  background: var(--cyan-dim);
  color: var(--cyan);
}

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

/* ── Background Grid ─────────────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* ── Custom Cursor ───────────────────────────────────────── */
.cursor-dot,
.cursor-ring {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s ease;
}

.cursor-dot {
  width: 6px;
  height: 6px;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  transition: width 0.2s, height 0.2s, background 0.2s;
}

.cursor-ring {
  width: 36px;
  height: 36px;
  border: 1.5px solid rgba(0, 212, 255, 0.5);
  transition: width 0.2s, height 0.2s, border-color 0.2s, transform 0.06s linear;
}

body:has(a:hover) .cursor-dot,
body:has(button:hover) .cursor-dot {
  width: 10px;
  height: 10px;
  background: var(--violet);
  box-shadow: 0 0 20px var(--violet);
}

body:has(a:hover) .cursor-ring,
body:has(button:hover) .cursor-ring {
  width: 52px;
  height: 52px;
  border-color: rgba(123, 47, 255, 0.5);
}

/* ── Navigation ─────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 32px;
  transition: var(--transition);
}

#navbar.scrolled {
  background: rgba(4, 8, 16, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  padding: 14px 32px;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
}

.nav-logo:hover {
  opacity: 0.8;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
}

.nav-link {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 14px;
  border-radius: 20px;
  border: 1px solid transparent;
  font-family: var(--font-cn);
  transition: var(--transition);
  letter-spacing: 0.05em;
}

.nav-link:hover {
  color: var(--text-primary);
  border-color: var(--border-subtle);
  background: var(--bg-glass);
}

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  padding: 6px 14px;
  cursor: none;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: var(--transition);
}

.lang-toggle:hover {
  border-color: var(--cyan);
  box-shadow: 0 0 16px var(--cyan-dim);
}

.lang-option {
  color: var(--text-muted);
  transition: var(--transition);
}

.lang-option.active {
  color: var(--cyan);
}

.lang-divider {
  color: var(--text-muted);
  font-size: 10px;
}

/* ── Hero ───────────────────────────────────────────────── */
#hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#particleCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 20px;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 16px;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.3s forwards;
}

.eyebrow-line {
  display: block;
  width: 40px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan));
}

.eyebrow-line:last-child {
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.eyebrow-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--cyan);
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-cn);
  font-size: clamp(4rem, 12vw, 9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 30%, var(--cyan) 60%, var(--violet) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 40px rgba(0, 212, 255, 0.3));
  opacity: 0;
  animation: fadeUp 1s ease 0.5s forwards;
}

.hero-subtitle-wrap {
  opacity: 0;
  animation: fadeUp 0.8s ease 0.7s forwards;
}

.hero-subtitle-en {
  font-family: var(--font-mono);
  font-size: clamp(0.85rem, 2vw, 1.1rem);
  letter-spacing: 0.45em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.hero-desc {
  font-family: var(--font-cn);
  font-size: clamp(0.85rem, 1.5vw, 1rem);
  color: var(--text-secondary);
  line-height: 2;
  letter-spacing: 0.08em;
  opacity: 0;
  animation: fadeUp 0.8s ease 0.9s forwards;
}

.hero-cta-group {
  margin-top: 8px;
  opacity: 0;
  animation: fadeUp 0.8s ease 1.1s forwards;
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  border-radius: 40px;
  font-family: var(--font-cn);
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  letter-spacing: 0.08em;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 24px rgba(0, 212, 255, 0.25);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--violet), var(--cyan));
  opacity: 0;
  transition: var(--transition);
}

.btn-primary:hover::before {
  opacity: 1;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 212, 255, 0.4);
}

.btn-primary > * {
  position: relative;
  z-index: 1;
}

/* ── Scroll Indicator ────────────────────────────────────── */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeIn 1s ease 1.6s forwards;
}

.scroll-chevron {
  animation: bounce 2s ease-in-out infinite;
}

/* ── Sections ────────────────────────────────────────────── */
.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--section-padding);
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 72px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--cyan);
  margin-bottom: 16px;
}

.section-title {
  font-family: var(--font-cn);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--text-primary), rgba(240, 244, 255, 0.7));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-desc {
  font-family: var(--font-cn);
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.9;
}

/* ── Philosophy Section ──────────────────────────────────── */
#philosophy {
  position: relative;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.philosophy-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.philosophy-card {
  position: relative;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: var(--transition);
  animation-delay: var(--delay, 0s);
}

.philosophy-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-cyan);
}

.card-glow {
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  filter: blur(60px);
  top: -60px;
  right: -60px;
  pointer-events: none;
  transition: var(--transition);
}

.philosophy-card:hover .card-glow {
  opacity: 0.5;
}

.glow-cyan { background: var(--cyan-glow); opacity: 0.15; }
.glow-violet { background: var(--violet-glow); opacity: 0.15; }
.glow-gold { background: rgba(255, 209, 102, 0.3); opacity: 0.15; }

.card-number {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 20px;
}

.card-icon svg {
  width: 100%;
  height: 100%;
}

.card-title-zh {
  font-family: var(--font-cn);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.card-title-en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 16px;
  text-transform: uppercase;
}

.card-desc {
  font-family: var(--font-cn);
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.9;
}

/* ── Manifesto Section ───────────────────────────────────── */
#manifesto {
  position: relative;
  overflow: hidden;
}

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

.manifesto-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(123, 47, 255, 0.18), transparent 70%);
  top: -200px;
  left: -100px;
}

.orb-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.12), transparent 70%);
  bottom: -100px;
  right: -50px;
}

.manifesto-content {
  position: relative;
  text-align: center;
  max-width: 860px;
  margin: 0 auto;
}

.manifesto-mark {
  font-size: 9rem;
  line-height: 0.6;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-family: 'Space Grotesk', 'Noto Sans SC', sans-serif;
  font-weight: 700;
  display: block;
}

.manifesto-quote {
  font-family: var(--font-cn);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  line-height: 2.2;
  color: var(--text-secondary);
  letter-spacing: 0.06em;
  font-style: normal;
  margin-bottom: 40px;
  position: relative;
}

.manifesto-attribution {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
}

.attribution-line {
  display: block;
  width: 60px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--text-muted));
}

.attribution-line:last-child {
  background: linear-gradient(90deg, var(--text-muted), transparent);
}

.attribution-text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  text-transform: uppercase;
}

/* ── Vision Section ──────────────────────────────────────── */
#vision {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.vision-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.vision-tile {
  position: relative;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 32px 28px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: var(--transition);
  animation-delay: var(--delay, 0s);
}

.vision-tile::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--tile-color, var(--cyan)), transparent);
  opacity: 0;
  transition: var(--transition);
}

.vision-tile:hover {
  border-color: rgba(var(--tile-color-rgb, 0, 212, 255), 0.3);
  transform: translateY(-4px);
}

.vision-tile:hover::before {
  opacity: 1;
}

.tile-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  color: var(--tile-color, var(--cyan));
  opacity: 0.8;
}

.vision-tile h4 {
  font-family: var(--font-cn);
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.vision-tile p {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.8;
  letter-spacing: 0.05em;
}

/* ── Contact Section ─────────────────────────────────────── */
#contact {
  position: relative;
}

.contact-inner {
  position: relative;
  text-align: center;
  background: var(--bg-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 80px 48px;
  overflow: hidden;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  max-width: 700px;
  margin: 0 auto;
}

.contact-glow {
  position: absolute;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 212, 255, 0.08), transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.contact-title {
  font-family: var(--font-cn);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
  margin: 12px 0 16px;
  background: linear-gradient(135deg, var(--text-primary), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.contact-desc {
  font-family: var(--font-cn);
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.9;
  margin-bottom: 36px;
}

.contact-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* ── Footer ──────────────────────────────────────────────── */
#footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 48px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
}

.footer-tagline {
  font-family: var(--font-cn);
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.footer-copy {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ── Scroll Reveal ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  transition-delay: var(--delay, 0s);
}

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

/* ── Animations ──────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 20px rgba(0, 212, 255, 0.2); }
  50% { box-shadow: 0 0 40px rgba(0, 212, 255, 0.4); }
}

@keyframes shimmer {
  from { background-position: -200% center; }
  to { background-position: 200% center; }
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .philosophy-grid { grid-template-columns: 1fr; }
  .vision-grid { grid-template-columns: repeat(2, 1fr); }
  .nav-links { display: none; }
  :root { --section-padding: 80px 20px; }
}

@media (max-width: 600px) {
  .vision-grid { grid-template-columns: 1fr; }
  .philosophy-card { padding: 28px 24px; }
  .contact-inner { padding: 48px 24px; }
  .hero-desc { display: none; }
  #navbar { padding: 16px 20px; }
  .cursor-dot, .cursor-ring { display: none; }
  body { cursor: auto; }
}