/* ========================================
   像素未来 — Design System & Styles
   ======================================== */

/* --- Design Tokens --- */
:root {
  /* Typography */
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  /* Transitions */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.4s;
  --duration-slow: 0.8s;
}

/* --- Dark Theme (default) --- */
[data-theme="dark"] {
  --color-bg: #0a0a0f;
  --color-bg-elevated: #111118;
  --color-bg-card: rgba(18, 18, 28, 0.85);
  --color-surface: rgba(255, 255, 255, 0.04);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);

  --color-text-primary: #f0f0f5;
  --color-text-secondary: rgba(240, 240, 245, 0.6);
  --color-text-tertiary: rgba(240, 240, 245, 0.35);

  --color-accent-security: #3bead5;
  --color-accent-security-dim: rgba(59, 234, 213, 0.12);
  --color-accent-security-glow: rgba(59, 234, 213, 0.25);
  --color-accent-agent: #60a5fa;
  --color-accent-agent-dim: rgba(96, 165, 250, 0.12);
  --color-accent-agent-glow: rgba(96, 165, 250, 0.25);

  --color-badge-bg: rgba(255, 255, 255, 0.06);
  --color-badge-border: rgba(255, 255, 255, 0.1);

  --color-nav-bg: rgba(10, 10, 15, 0.8);

  --pixel-canvas-opacity: 0.3;
  --card-backdrop: blur(24px);
}

/* --- Light Theme --- */
[data-theme="light"] {
  --color-bg: #f8f8fc;
  --color-bg-elevated: #ffffff;
  --color-bg-card: rgba(255, 255, 255, 0.9);
  --color-surface: rgba(0, 0, 0, 0.03);
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-hover: rgba(0, 0, 0, 0.15);

  --color-text-primary: #111118;
  --color-text-secondary: rgba(17, 17, 24, 0.6);
  --color-text-tertiary: rgba(17, 17, 24, 0.35);

  --color-accent-security: #0d9488;
  --color-accent-security-dim: rgba(13, 148, 136, 0.08);
  --color-accent-security-glow: rgba(13, 148, 136, 0.15);
  --color-accent-agent: #2563eb;
  --color-accent-agent-dim: rgba(37, 99, 235, 0.08);
  --color-accent-agent-glow: rgba(37, 99, 235, 0.15);

  --color-badge-bg: rgba(0, 0, 0, 0.04);
  --color-badge-border: rgba(0, 0, 0, 0.08);

  --color-nav-bg: rgba(248, 248, 252, 0.85);

  --pixel-canvas-opacity: 0.12;
  --card-backdrop: blur(20px);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out);
  overflow-x: hidden;
}

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

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

/* --- Pixel Canvas Background --- */
#pixelCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  opacity: var(--pixel-canvas-opacity);
  transition: opacity var(--duration-normal) var(--ease-out);
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-nav-bg);
  backdrop-filter: blur(16px) saturate(1.5);
  -webkit-backdrop-filter: blur(16px) saturate(1.5);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}

.nav-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 1rem;
  line-height: 1;
  transition: opacity var(--duration-fast) var(--ease-out);
}

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

.logo-pixel {
  color: var(--color-accent-agent);
  line-height: 1;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-size: 0;
}

.logo-pixel::before {
  content: '';
  display: block;
  width: 11px;
  height: 11px;
  background: var(--color-accent-agent);
}

.logo-cursor {
  display: inline-block;
  width: 1.5px;
  height: 11px;
  background: var(--color-accent-agent);
  animation: logoCursorBlink 1s step-end infinite;
}

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

.logo-text {
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  line-height: 1;
}

.logo-en {
  font-size: 0.6rem;
  font-weight: 400;
  color: var(--color-text-tertiary);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Theme Toggle */
.theme-toggle {
  position: relative;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--color-border);
  transition: all var(--duration-fast) var(--ease-out);
}

.theme-toggle:hover {
  border-color: var(--color-border-hover);
  background: var(--color-surface);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  position: absolute;
  transition: all var(--duration-normal) var(--ease-out);
}

[data-theme="dark"] .theme-toggle .icon-sun {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}
[data-theme="dark"] .theme-toggle .icon-moon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}
[data-theme="light"] .theme-toggle .icon-sun {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}
[data-theme="light"] .theme-toggle .icon-moon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* --- Main Container --- */
.main-container {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 56px);
  padding: 70px var(--space-xl) var(--space-lg);
  gap: 3rem;
}

/* --- Hero Section --- */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0;
  max-width: 800px;
  animation: fadeInUp 0.8s var(--ease-out) both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  background: none;
  border: none;
  margin-bottom: 2rem;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent-security);
  animation: dotPulse 2s ease infinite;
}

@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 0 0 var(--color-accent-security-glow); }
  50% { box-shadow: 0 0 0 6px transparent; }
}

.hero-title {
  font-size: clamp(2.8rem, 7vw, 4.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 0.6rem;
}

.title-line {
  display: block;
}

.title-line-2 {
  font-family: var(--font-mono);
  font-size: 0.38em;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  margin-top: 0.5rem;
}

.hero-subtitle {
  font-size: 1.1rem;
  font-weight: 300;
  line-height: 1.7;
  color: var(--color-text-secondary);
  max-width: 480px;
  letter-spacing: 0.03em;
  margin-top: 2.2rem;
}

/* Typewriter cursor */
.typewriter-cursor {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background: var(--color-accent-agent);
  margin-left: 2px;
  vertical-align: text-bottom;
  animation: cursorBlink 0.7s step-end infinite;
}

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

.title-line-1 .typewriter-cursor {
  height: 1em;
  width: 3px;
}


/* --- Business Section --- */
.business-section {
  width: 100%;
  max-width: 860px;
  animation: fadeInUp 0.8s var(--ease-out) 0.3s both;
}

.business-grid {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 760px;
  margin: 0 auto;
  position: relative;
}

/* Business Cards — open layout, no box */
.biz-card {
  position: relative;
  overflow: hidden;
  border-radius: 28px;
  border: 1px solid var(--color-border);
  background:
    radial-gradient(circle at top right, var(--color-accent-agent-dim), transparent 38%),
    linear-gradient(135deg, var(--color-bg-elevated) 0%, var(--color-bg-card) 100%);
  box-shadow: 0 24px 70px rgba(17, 17, 24, 0.08);
  transition: border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}

.biz-card-agent {
  border-color: var(--color-accent-agent-dim);
}

.biz-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 90px rgba(37, 99, 235, 0.12);
}

.biz-card-glow {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.06), transparent),
    radial-gradient(circle at 80% 20%, var(--color-accent-agent-glow), transparent 28%);
  opacity: 0.8;
  pointer-events: none;
}

.biz-card-content {
  position: relative;
  z-index: 1;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  text-align: center;
}

.biz-header {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.9rem;
}

.biz-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0;
  transition: transform var(--duration-normal) var(--ease-spring);
}

.biz-icon-wrapper svg {
  width: 28px;
  height: 28px;
}

.biz-card:hover .biz-icon-wrapper {
  transform: scale(1.05);
}

.biz-icon-agent {
  background: var(--color-accent-agent-dim);
  color: var(--color-accent-agent);
}

.biz-title {
  font-size: clamp(2rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-accent-agent);
}

.biz-vision {
  font-size: clamp(1.08rem, 2vw, 1.24rem);
  color: var(--color-text-secondary);
  font-weight: 500;
  max-width: none;
  line-height: 1.4;
  margin: 0;
}

.biz-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  width: 100%;
  margin-top: var(--space-xs);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.biz-list li {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-height: 0;
  padding: 0 var(--space-md);
  border: none;
  background: none;
  font-size: 1.06rem;
  color: var(--color-text-primary);
  line-height: 1.5;
  text-align: center;
}

.biz-list li + li {
  border-left: 1px solid var(--color-border);
}

.biz-list li > span:last-child {
  font-weight: 600;
}

.biz-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  padding: 0;
  border-radius: 0;
  background: none;
  border: none;
  color: var(--color-accent-agent);
  white-space: nowrap;
  text-transform: uppercase;
}



/* --- Footer --- */
.footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--color-border);
  padding: var(--space-md) var(--space-xl);
  transition: border-color var(--duration-normal) var(--ease-out);
  flex-shrink: 0;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

.footer-logo-pixel {
  color: var(--color-accent-agent);
  font-size: 0;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  gap: 1px;
}

.footer-logo-pixel::before {
  content: '';
  display: block;
  width: 9px;
  height: 9px;
  background: var(--color-accent-agent);
}

.footer-logo-pixel .logo-cursor {
  height: 9px;
}

.footer-name {
  letter-spacing: 0.03em;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  line-height: 1.25;
  color: var(--color-text-secondary);
  letter-spacing: 0.04em;
}

.footer-meta span {
  display: inline-flex;
  align-items: center;
}

.footer-copy,
.footer-record {
  white-space: nowrap;
}

.footer-record {
  position: relative;
  margin-left: var(--space-md);
  padding-left: var(--space-md);
}

.footer-record::before {
  content: '';
  position: absolute;
  left: 0;
  width: 1px;
  height: 0.85rem;
  background: var(--color-border);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .main-container {
    padding: 80px var(--space-md) var(--space-xl);
    gap: var(--space-2xl);
  }

  .hero-title {
    font-size: clamp(2rem, 9vw, 3rem);
  }

  .hero-subtitle {
    font-size: 1rem;
  }


  .business-grid {
    gap: var(--space-2xl);
  }

  .biz-card {
    border-radius: 22px;
  }

  .biz-card-content {
    padding: var(--space-xl);
  }

  .biz-list {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding-top: var(--space-md);
  }

  .biz-list li {
    min-height: auto;
    padding: 0;
  }

  .biz-list li + li {
    border-left: none;
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-md);
  }



  .footer-content {
    flex-direction: column;
    gap: var(--space-md);
    text-align: center;
  }

  .footer-meta {
    flex-direction: column;
    justify-content: center;
    gap: var(--space-xs);
  }

  .footer-record {
    margin-left: 0;
    padding-left: 0;
  }

  .footer-record::before {
    display: none;
  }

  .nav-content {
    padding: 0 var(--space-md);
  }

  .logo-en {
    display: none;
  }
}

@media (max-width: 480px) {
  .main-container {
    gap: 3rem;
  }
}