/* ═══════════════════════════════════════════════════════════
   JIMAX Unified Design System v2
   Shared foundation for all 5 sites: jzxgc | jimax | jzx.mobi | jzx.pw | pcroom.xyz
   ═══════════════════════════════════════════════════════════ */

/* === Per-Site Primary Color Override ===
   Set --primary and --primary-light BEFORE loading this file:
   jzxgc.com:    --primary: #2563eb;  --primary-light: #60a5fa;  (royal blue)
   jimax.com.cn: --primary: #4f46e5;  --primary-light: #818cf8;  (indigo-violet)
   jzx.mobi:     --primary: #2563eb;  --primary-light: #60a5fa;  (cobalt+steel)
   jzx.pw:       --primary: #0d9488;  --primary-light: #5eead4;  (teal+green)
   pcroom.xyz:   --primary: #009688;  --primary-light: #5dd5c8;  (teal+cyan)
   ═══════════════════════════════════════════════════════════ */

:root {
  /* ── Primary Palette (override per site) ── */
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --primary-bg: rgba(37,99,235,.06);
  --primary-border: rgba(37,99,235,.18);

  /* ── Neutral Palette ── */
  --gray-900: #0f172a;
  --gray-800: #1e293b;
  --gray-700: #334155;
  --gray-600: #475569;
  --gray-500: #64748b;
  --gray-400: #94a3b8;
  --gray-300: #cbd5e1;
  --gray-200: #e2e8f0;
  --gray-100: #f1f5f9;
  --gray-50: #f8fafc;
  --white: #ffffff;
  --black: #0b1120;

  /* ── Semantic ── */
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;

  /* ── Typography ── */
  --font-sans: "Inter", -apple-system, "Noto Sans SC", "Microsoft YaHei", "PingFang SC", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", monospace;
  --text-h1: 52px;
  --text-h2: 28px;
  --text-h3: 18px;
  --text-body: 16px;
  --text-sm: 13px;
  --text-xs: 11px;
  --leading: 1.75;

  /* ── Spacing ── */
  --section-gap: 80px;
  --card-gap: 20px;
  --container-max: 1200px;

  /* ── Shape ── */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-pill: 100px;

  /* ── Depth ── */
  --shadow-sm: 0 1px 3px rgba(15,23,42,.06);
  --shadow: 0 4px 16px rgba(15,23,42,.08);
  --shadow-lg: 0 12px 36px rgba(15,23,42,.12);

  /* ── Motion ── */
  --ease: cubic-bezier(.4,0,.2,1);
  --duration: .25s;
}

/* ═══ Reset & Base ═══ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

html { font-size: var(--text-body); -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--leading);
  color: var(--gray-800);
  background: var(--gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ═══ Container ═══ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ═══ Typography ═══ */
h1 { font-size: var(--text-h1); font-weight: 800; line-height: 1.12; letter-spacing: -0.5px; }
h2 { font-size: var(--text-h2); font-weight: 800; line-height: 1.25; letter-spacing: -0.3px; }
h3 { font-size: var(--text-h3); font-weight: 700; line-height: 1.35; }

.gradient-text {
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ═══ Header ═══ */
.header {
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--gray-200);
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header .container { display: flex; align-items: center; justify-content: space-between; }

.logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo img { height: 28px; width: auto; }
.logo span { color: var(--primary); }
.logo small {
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--gray-400);
  display: block;
}

/* ═══ Navigation ═══ */
.nav { display: flex; gap: 28px; align-items: center; }
.nav a {
  color: var(--gray-600);
  font-size: 14px;
  font-weight: 500;
  transition: color var(--duration) var(--ease);
  white-space: nowrap;
}
.nav a:hover { color: var(--primary); }
.nav .active { color: var(--primary); font-weight: 600; }

.nav .cta-btn {
  background: var(--primary);
  color: var(--white);
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 14px;
  transition: all var(--duration) var(--ease);
}
.nav .cta-btn:hover {
  background: var(--primary-dark);
  color: var(--white);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0,0,0,.15);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 26px;
  color: var(--gray-800);
  cursor: pointer;
  padding: 8px;
  line-height: 1;
  min-height: 44px;
  min-width: 44px;
}

/* ═══ Sections ═══ */
.section { padding: var(--section-gap) 0; }
.section-alt { background: var(--gray-50); }
.section-dark { background: var(--gray-900); color: var(--white); }

.section-title {
  text-align: center;
  font-size: var(--text-h2);
  font-weight: 800;
  color: var(--gray-900);
  margin-bottom: 12px;
}
.section-dark .section-title { color: var(--white); }

.section-sub {
  text-align: center;
  font-size: var(--text-body);
  color: var(--gray-500);
  max-width: 640px;
  margin: 0 auto 48px;
  line-height: var(--leading);
}
.section-dark .section-sub { color: var(--gray-400); }

/* ═══ Buttons ═══ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--duration) var(--ease);
  text-decoration: none;
  gap: 8px;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(0,0,0,.12);
}
.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px rgba(0,0,0,.18);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}
.btn-outline:hover {
  background: var(--primary-bg);
}

.btn-white {
  background: var(--white);
  color: var(--gray-900);
}
.btn-white:hover {
  background: var(--gray-100);
  transform: translateY(-1px);
}

.btn-ghost-white {
  background: rgba(255,255,255,.06);
  color: var(--white);
  border: 2px solid rgba(255,255,255,.25);
}
.btn-ghost-white:hover {
  border-color: rgba(255,255,255,.5);
  background: rgba(255,255,255,.1);
}

.btn-sm { min-height: 40px; padding: 10px 20px; font-size: 13px; }
.btn-lg { min-height: 56px; padding: 16px 40px; font-size: 16px; }

/* ═══ Cards ═══ */
.card {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: all var(--duration) var(--ease);
  box-shadow: var(--shadow-sm);
}
.card:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

/* ═══ Grids ═══ */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--card-gap); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--card-gap); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--card-gap); }

/* ═══ Tags / Badges ═══ */
.tag {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--primary-bg);
  color: var(--primary);
  border: 1px solid var(--primary-border);
}

/* ═══ Hero Common ═══ */
.hero {
  padding: 80px 0 70px;
  position: relative;
  overflow: hidden;
}
.hero-pattern::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  opacity: .5;
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  opacity: .15;
}
.hero-badge {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 1.5px;
  padding: 5px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 16px;
  text-transform: uppercase;
}
.hero p {
  font-size: var(--text-body);
  line-height: var(--leading);
  color: rgba(255,255,255,.7);
  margin-bottom: 24px;
}
.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* ═══ Data Strip ═══ */
.data-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 36px;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,.1);
}
.data-item {
  text-align: center;
  background: rgba(255,255,255,.06);
  border-radius: var(--radius);
  padding: 18px 12px;
}
.data-item .num {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary-light);
  display: block;
  font-variant-numeric: tabular-nums;
}
.data-item .label {
  font-size: var(--text-xs);
  color: rgba(255,255,255,.5);
  margin-top: 4px;
  display: block;
}

/* ═══ Contact Grid ═══ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--card-gap);
}
.contact-item {
  text-align: center;
  padding: 24px 16px;
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
}
.contact-item .c-icon { margin-bottom: 12px; }
.contact-item h4 { font-size: 14px; color: var(--gray-500); margin-bottom: 8px; }
.contact-item .c-val { font-size: 15px; font-weight: 600; color: var(--gray-800); }

/* ═══ Footer ═══ */
.footer {
  background: var(--gray-900);
  color: rgba(255,255,255,.45);
  padding: 48px 0 32px;
  font-size: var(--text-sm);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}
.footer-brand p { color: rgba(255,255,255,.4); line-height: var(--leading); margin-top: 8px; }
.footer-col h4 { color: var(--white); font-size: 14px; font-weight: 600; margin-bottom: 14px; }
.footer-col a { display: block; color: rgba(255,255,255,.4); padding: 4px 0; font-size: var(--text-sm); transition: color var(--duration) var(--ease); }
.footer-col a:hover { color: var(--primary-light); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding-top: 20px; text-align: center; color: rgba(255,255,255,.3); font-size: var(--text-xs); }
.footer-bottom a { color: rgba(255,255,255,.35); }
.footer-bottom a:hover { color: var(--primary-light); }

/* ═══ Floating Sidebar ═══ */
.sidebar-float {
  position: fixed;
  right: 20px;
  bottom: 120px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 90;
}
.sidebar-item {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--gray-900);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  position: relative;
  transition: all var(--duration) var(--ease);
  box-shadow: var(--shadow);
}
.sidebar-item:hover { background: var(--primary); transform: scale(1.05); }
.sidebar-item svg { width: 20px; height: 20px; }
.sidebar-tip {
  display: none;
  position: absolute;
  right: 60px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  white-space: nowrap;
  padding: 12px 18px;
}
.sidebar-item:hover .sidebar-tip { display: block; }

/* ═══ Animations (reduced motion) ═══ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  html { scroll-behavior: auto; }
}

/* ═══════════════════════════════════════════════
   RESPONSIVE — Mobile First Overrides
   ═══════════════════════════════════════════════ */

@media (max-width: 1024px) {
  :root {
    --text-h1: 40px;
    --section-gap: 60px;
  }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  :root {
    --text-h1: 30px;
    --text-h2: 24px;
    --text-h3: 17px;
    --text-body: 16px;
    --section-gap: 48px;
    --card-gap: 14px;
  }

  .container { padding: 0 16px; }

  /* ── Mobile Nav ── */
  .menu-toggle { display: block; }
  .nav {
    display: none;
    flex-direction: column;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: rgba(255,255,255,.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 16px 24px;
    box-shadow: var(--shadow-lg);
    gap: 0;
    z-index: 99;
  }
  .nav.open { display: flex; }
  .nav a {
    padding: 14px 0;
    border-bottom: 1px solid var(--gray-100);
    font-size: 16px;
    width: 100%;
  }
  .nav a:last-child { border-bottom: none; }
  .nav .cta-btn { text-align: center; margin-top: 8px; }

  /* ── Hero ── */
  .hero {
    padding: 56px 0 48px;
    text-align: center;
    min-height: auto;
  }
  .hero p {
    font-size: 15px;
    max-width: 26em;
    margin-left: auto;
    margin-right: auto;
  }
  .hero-actions {
    flex-direction: column;
    align-items: center;
  }
  .hero-actions .btn,
  .hero-actions a {
    width: 100%;
    max-width: 320px;
  }

  /* ── Data Strip ── */
  .data-strip { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .data-item .num { font-size: 24px; }

  /* ── Grids ── */
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }

  /* ── Footer ── */
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }

  /* ── Sidebar ── */
  .sidebar-float {
    right: 12px;
    bottom: 80px;
    gap: 6px;
  }
  .sidebar-item {
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  :root {
    --text-h1: 28px;
    --text-h2: 22px;
    --text-h3: 16px;
  }
  .container { padding: 0 14px; }
  .hero { padding: 48px 0 40px; }
}