:root {
  --bg: #0b0b0b;
  --bg-alt: #f7f7f2;
  --ink: #0b0b0b;
  --ink-invert: #f7f7f2;
  --accent: #ff2d2d;
  --accent-2: #ffe100;
  --accent-3: #00e5ff;
  --border: 4px solid #0b0b0b;
  --max: 1200px;
  --space-1: 10px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 44px;
  --space-6: 60px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: "Arial Black", "Impact", "PingFang SC", sans-serif; background: var(--bg-alt); color: var(--ink); line-height: 1.6; }
a { color: inherit; text-decoration: none; }
img { width: 100%; display: block; border: var(--border); }
button { font: inherit; border: none; background: none; cursor: pointer; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--space-3); }

.topbar { position: sticky; top: 0; z-index: 1000; background: var(--accent-2); border-bottom: var(--border); }
.topbar-inner { height: 72px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.brand { display: flex; align-items: baseline; gap: 10px; }
.brand-mark { font-size: 1.1rem; letter-spacing: 0.08em; text-transform: uppercase; }
.brand-sub { font-size: 0.95rem; }
.nav { display: flex; gap: var(--space-3); }
.nav a { padding: 6px 0; border-bottom: 3px solid transparent; }
.nav a:hover { border-color: var(--ink); }
.actions { display: flex; gap: var(--space-2); align-items: center; }
.menu { display: none; width: 44px; height: 44px; border: var(--border); background: var(--bg-alt); }
.nav-m { display: none; flex-direction: column; gap: 10px; padding: var(--space-2); border-top: var(--border); background: var(--bg-alt); }
.nav-m.is-open { display: flex; }

.hero { padding: var(--space-6) 0 var(--space-5); background: var(--accent); color: var(--ink-invert); border-bottom: var(--border); }
.hero-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-5); align-items: center; }
.kicker { display: block; font-size: 0.85rem; letter-spacing: 0.2em; text-transform: uppercase; }
.hero h1 { font-size: clamp(2.2rem, 4vw, 3.8rem); margin: var(--space-2) 0; }
.lead { font-family: "Arial", "PingFang SC", sans-serif; font-size: 1.05rem; }
.hero-actions { display: flex; gap: var(--space-2); margin-top: var(--space-3); }
.hero-media img { border-color: var(--ink-invert); }

.section { padding: var(--space-5) 0; }
.section-head { display: flex; align-items: center; gap: var(--space-2); margin-bottom: var(--space-2); flex-wrap: wrap; }
.section-head h2 { font-size: 1.6rem; text-transform: uppercase; }
.rule { flex: 1; height: 6px; background: var(--ink); }
.sub { width: 100%; font-family: "Arial", "PingFang SC", sans-serif; font-size: 0.95rem; }

.btn { background: var(--ink); color: var(--ink-invert); padding: 12px 18px; border: var(--border); }
.btn.ghost { background: var(--bg-alt); color: var(--ink); }

.timeline { position: relative; padding-left: 10px; }
.timeline::before { content: ""; position: absolute; left: 50%; top: 0; bottom: 0; width: 6px; background: var(--ink); transform: translateX(-50%); }
.t-item { position: relative; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-bottom: var(--space-2); }
.t-item.left .t-card { grid-column: 1; }
.t-item.right .t-card { grid-column: 2; }
.t-dot { position: absolute; left: 50%; top: 20px; width: 14px; height: 14px; background: var(--accent-3); border: var(--border); transform: translateX(-50%); }
.t-card { background: var(--bg-alt); border: var(--border); padding: var(--space-2); width: 86%; }
.t-item.left .t-card { margin-right: auto; }
.t-item.right .t-card { margin-left: auto; }
.t-card time { font-size: 0.85rem; text-transform: uppercase; }
.t-card h3 { margin: 8px 0; font-size: 1.15rem; }
.t-card p { font-family: "Arial", "PingFang SC", sans-serif; }

.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-3); }
.card { background: var(--accent-2); border: var(--border); padding: var(--space-2); }
.card:nth-child(2n) { background: var(--accent-3); }
.card h3 { margin-bottom: 6px; }
.card p { font-family: "Arial", "PingFang SC", sans-serif; }

.guide-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-2) var(--space-4); font-family: "Arial", "PingFang SC", sans-serif; }

.entry { background: var(--ink); color: var(--ink-invert); border-top: var(--border); border-bottom: var(--border); }
.entry-grid { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }

.safety { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-2); font-family: "Arial", "PingFang SC", sans-serif; }
.safety span { padding: 12px 14px; border: var(--border); background: var(--bg-alt); }

.float-chat { position: fixed; right: 20px; bottom: 20px; z-index: 999; }
.float-main { width: 64px; height: 64px; border: var(--border); background: var(--accent); color: var(--ink-invert); font-weight: 700; }

.footer { border-top: var(--border); padding: var(--space-5) 0 var(--space-3); background: var(--bg-alt); }
.footer-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-3); font-family: "Arial", "PingFang SC", sans-serif; }
.footer-grid h3, .footer-grid h4 { color: var(--ink); margin-bottom: 6px; font-family: "Arial Black", "Impact", sans-serif; }
.footer-grid a { display: block; margin-bottom: 6px; }
.footer-bottom { margin-top: var(--space-3); font-size: 0.85rem; font-family: "Arial", "PingFang SC", sans-serif; }

@media (max-width: 1024px) {
  .hero-grid, .t-item { grid-template-columns: 1fr; }
  .timeline::before { left: 12px; transform: none; }
  .t-item { padding-left: 26px; }
  .t-card { width: 100%; }
  .t-item.left .t-card, .t-item.right .t-card { margin: 0; }
  .t-dot { left: 12px; transform: none; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .guide-list { grid-template-columns: 1fr; }
  .safety { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 768px) {
  .nav { display: none; }
  .menu { display: inline-flex; align-items: center; justify-content: center; }
  .grid, .footer-grid { grid-template-columns: 1fr; }
  .section { padding: var(--space-5) 0; }
  .entry-grid { flex-direction: column; align-items: flex-start; }
}

.articles-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.article-card {
  display: flex;
  align-items: stretch;
  gap: 10px;
  background: var(--bg-alt);
  border: var(--border);
  padding: 8px 10px;
  min-height: 92px;
}

.article-card img {
  width: 78px;
  height: 100%;
  object-fit: cover;
  border: var(--border);
  background: #fff;
  flex: 0 0 auto;
}

.article-card h3 {
  font-size: 0.98rem;
  line-height: 1.35;
}

.article-body {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 8px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: "Arial", "PingFang SC", sans-serif;
  font-size: 0.78rem;
}

.article-meta .tag {
  padding: 2px 6px;
  border: var(--border);
  background: var(--accent-2);
}

.article-meta .author {
  border-bottom: 3px solid var(--ink);
}

.article-meta time {
  text-transform: uppercase;
}

@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .articles-grid {
    grid-template-columns: 1fr;
  }
}