/* ============================================================
   艺彤国际货运 · 全站样式 (深色态势感知风格)
   ============================================================ */
:root {
  --bg: #040b16;
  --bg2: #071527;
  --panel: rgba(10, 28, 48, 0.72);
  --panel-solid: #0a1c30;
  --line: rgba(56, 160, 220, 0.22);
  --cyan: #37c8f0;
  --cyan-dim: #1f8ab5;
  --amber: #ffb85c;
  --text: #d7e9f5;
  --text-dim: #8fa9bd;
  --white: #f2f9ff;
  --accent-gradient: linear-gradient(120deg, #37c8f0, #6ee7d8);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--cyan); text-decoration: none; }
img { max-width: 100%; }

::selection { background: rgba(55, 200, 240, 0.3); }

/* ---------- 滚动条 ---------- */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: #1c4664; border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #2a6a92; }

/* ============================================================
   顶部导航
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(16px, 4vw, 48px);
  height: 64px;
  background: rgba(4, 11, 22, 0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--white);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 1px;
}
.brand .logo-mark {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border: 1px solid var(--cyan);
  border-radius: 8px;
  color: var(--cyan);
  font-size: 15px;
  font-family: Consolas, monospace;
  background: rgba(55, 200, 240, 0.08);
  box-shadow: 0 0 14px rgba(55, 200, 240, 0.35) inset;
}
.brand .brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 9px;
  background: #f2f7ff;
  padding: 3px;
  box-shadow: 0 0 16px rgba(55, 200, 240, 0.4);
}
.brand small {
  display: block;
  font-size: 10px;
  color: var(--text-dim);
  font-weight: 400;
  letter-spacing: 3px;
}

.main-nav { display: flex; gap: 6px; }
.main-nav a {
  color: var(--text-dim);
  font-size: 15px;
  padding: 8px 16px;
  border-radius: 6px;
  transition: 0.25s;
  position: relative;
}
.main-nav a:hover { color: var(--white); background: rgba(55, 200, 240, 0.08); }
.main-nav a.active {
  color: var(--cyan);
}
.main-nav a.active::after {
  content: "";
  position: absolute;
  left: 16px; right: 16px; bottom: 2px;
  height: 2px;
  background: var(--accent-gradient);
  box-shadow: 0 0 8px var(--cyan);
}

.nav-cta {
  border: 1px solid var(--cyan) !important;
  color: var(--cyan) !important;
  box-shadow: 0 0 12px rgba(55, 200, 240, 0.25);
}
.nav-cta:hover {
  background: rgba(55, 200, 240, 0.15) !important;
  color: var(--white) !important;
}

/* 移动端菜单 */
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--cyan);
  font-size: 20px;
  border-radius: 6px;
  width: 40px; height: 40px;
  cursor: pointer;
}

@media (max-width: 860px) {
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    background: rgba(4, 11, 22, 0.96);
    border-bottom: 1px solid var(--line);
    padding: 12px 16px 20px;
  }
  .main-nav.open { display: flex; }
  .main-nav a.active::after { display: none; }
}

/* ============================================================
   通用区块
   ============================================================ */
.section {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(30px, 4.5vw, 52px) clamp(16px, 4vw, 40px);
}

.section-head { margin-bottom: 24px; }
.section-head .kicker {
  font-family: Consolas, "Courier New", monospace;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 4px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-head .kicker::before {
  content: "";
  width: 28px; height: 1px;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
}
.section-head h2 {
  font-size: clamp(26px, 4vw, 38px);
  color: var(--white);
  margin-top: 10px;
  letter-spacing: 1px;
}
.section-head p.sub {
  color: var(--text-dim);
  margin-top: 10px;
  max-width: 640px;
}

/* 内页顶部横幅 */
.page-hero {
  padding: 108px clamp(16px, 4vw, 40px) 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 60% 80% at 50% -20%, rgba(31, 138, 181, 0.25), transparent),
    var(--bg);
  border-bottom: 1px solid var(--line);
}
.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(55, 200, 240, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(55, 200, 240, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 75%);
}
.page-hero .kicker {
  font-family: Consolas, monospace;
  color: var(--cyan);
  letter-spacing: 5px;
  font-size: 13px;
}
.page-hero h1 {
  font-size: clamp(30px, 5vw, 46px);
  color: var(--white);
  margin: 14px 0 12px;
  letter-spacing: 2px;
}
.page-hero p { color: var(--text-dim); max-width: 640px; margin: 0 auto; }
.page-hero > * { position: relative; }

/* 按钮 */
.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: 6px;
  font-size: 15px;
  letter-spacing: 2px;
  transition: 0.3s;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: linear-gradient(120deg, #1c96c4, #2ec9b4);
  color: #04121c;
  font-weight: 700;
  box-shadow: 0 0 24px rgba(55, 200, 240, 0.35);
}
.btn-primary:hover {
  box-shadow: 0 0 38px rgba(55, 200, 240, 0.6);
  transform: translateY(-2px);
}
.btn-ghost {
  border-color: var(--line);
  color: var(--text);
  background: rgba(55, 200, 240, 0.04);
}
.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--white);
  background: rgba(55, 200, 240, 0.12);
}

/* 卡片 */
.grid { display: grid; gap: 14px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 980px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  position: relative;
  overflow: hidden;
  transition: 0.3s;
}
.card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(55, 200, 240, 0.6), transparent);
  opacity: 0;
  transition: 0.3s;
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(55, 200, 240, 0.5);
  box-shadow: 0 14px 40px rgba(2, 10, 20, 0.7), 0 0 24px rgba(55, 200, 240, 0.08);
}
.card:hover::before { opacity: 1; }

.card .icon {
  width: 44px; height: 44px;
  display: grid;
  place-items: center;
  font-size: 22px;
  border-radius: 10px;
  background: rgba(55, 200, 240, 0.1);
  border: 1px solid var(--line);
  margin-bottom: 12px;
}
.card h3 { color: var(--white); font-size: 19px; margin-bottom: 8px; letter-spacing: 1px; }
.card p { color: var(--text-dim); font-size: 14.5px; }
.card .more {
  display: inline-block;
  margin-top: 10px;
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 1px;
}
.card .more:hover { text-shadow: 0 0 10px var(--cyan); }

/* 数字统计条 */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.stat-strip .cell {
  background: var(--bg2);
  padding: 30px 16px;
  text-align: center;
}
.stat-strip .num {
  font-family: Consolas, "Courier New", monospace;
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  color: var(--white);
  text-shadow: 0 0 18px rgba(55, 200, 240, 0.55);
  font-variant-numeric: tabular-nums;
}
.stat-strip .num em { font-style: normal; color: var(--cyan); }
.stat-strip .lbl { color: var(--text-dim); font-size: 13px; letter-spacing: 2px; margin-top: 6px; }
@media (max-width: 640px) {
  .stat-strip { grid-template-columns: repeat(2, 1fr); }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--bg2);
  margin-top: 28px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 34px clamp(16px, 4vw, 40px) 22px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: 28px;
}
@media (max-width: 900px) {
  .footer-inner { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .footer-inner { grid-template-columns: 1fr; }
}
.footer-inner h4 {
  color: var(--white);
  font-size: 15px;
  letter-spacing: 2px;
  margin-bottom: 16px;
}
.footer-inner ul { list-style: none; }
.footer-inner li { margin-bottom: 9px; color: var(--text-dim); font-size: 14px; }
.footer-inner a { color: var(--text-dim); transition: 0.2s; }
.footer-inner a:hover { color: var(--cyan); }
.footer-about p { color: var(--text-dim); font-size: 14px; margin-top: 12px; }
.copyright {
  border-top: 1px solid var(--line);
  text-align: center;
  padding: 18px;
  color: #5d7588;
  font-size: 12.5px;
  letter-spacing: 1px;
}

/* 入场动画 */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible { opacity: 1; transform: none; }