:root {
  --white: #FFFFFF;
  --near-black: #1D1D1F;
  --black: #000000;
  --line: rgba(29,29,31,0.15);
  --line-dark: rgba(29,29,31,0.4);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--white);
  color: var(--near-black);
  font-size: 13px;
  line-height: 1.6;
  cursor: crosshair;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(29,29,31,0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(29,29,31,0.025) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* 消除 <a> 标签默认样式，使其可以作为卡片包裹器 */
a { text-decoration: none; color: inherit; }

.mono { font-family: 'Space Mono', monospace; }

.section-label {
  font-family: 'Space Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.35em;
  text-transform: uppercase;
  color: rgba(29,29,31,0.4);
}

.axis-line { width: 100%; height: 1px; background: var(--line-dark); }

@keyframes scan {
  0% { transform: translateY(-100%); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateY(100vh); opacity: 0; }
}

.scan-line {
  position: fixed; top: 0; left: 0; width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent, rgba(29,29,31,0.3), transparent);
  animation: scan 4s linear infinite; pointer-events: none; z-index: 100;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-up { animation: fadeUp 0.7s ease forwards; opacity: 0; }
.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.25s; }
.delay-3 { animation-delay: 0.4s; }
.delay-4 { animation-delay: 0.55s; }
.delay-5 { animation-delay: 0.7s; }

.hero-title {
  font-family: 'Space Mono', monospace;
  font-size: clamp(48px, 9vw, 120px);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 0.92;
  color: var(--black);
}

/* Tool Card (升级为可点击的 Block) */
.tool-card {
  display: block; /* 必须加，因为变成了a标签 */
  border: 1px solid var(--line-dark);
  position: relative;
  overflow: hidden;
  transition: border-color 0.25s ease;
  cursor: pointer;
}

.tool-card::before {
  content: ''; position: absolute; inset: 0;
  background: var(--near-black);
  transform: translateY(101%);
  transition: transform 0.35s cubic-bezier(0.76,0,0.24,1);
  z-index: 0;
}
.tool-card:hover::before { transform: translateY(0); }
.tool-card:hover { border-color: var(--black); }

.tool-card-front, .tool-card-back {
  transition: opacity 0.3s ease, transform 0.35s ease;
  position: relative; z-index: 1;
}

.tool-card-back {
  position: absolute; inset: 0; padding: 24px; opacity: 0;
  transform: translateY(8px); display: flex; flex-direction: column;
  justify-content: center;
}

.tool-card:hover .tool-card-front { opacity: 0; transform: translateY(-8px); }
.tool-card:hover .tool-card-back  { opacity: 1; transform: translateY(0); }
.tool-card-back * { color: rgba(255,255,255,0.85); }
.tool-card-back .mono { color: rgba(255,255,255,0.4); }

/* Spec row */
.spec-row {
  display: grid; grid-template-columns: 200px 1fr;
  border-bottom: 1px solid var(--line); padding: 14px 0; gap: 24px;
}
@media (max-width: 640px) { .spec-row { grid-template-columns: 1fr; gap: 4px; } }

/* Log card (升级为可点击) */
.log-card {
  display: block;
  border: 1px solid var(--line-dark);
  padding: 28px;
  transition: background 0.2s ease;
  cursor: pointer;
}
.log-card:hover { background: rgba(29,29,31,0.03); }

/* 其他样式 */
.coord { font-family: 'Space Mono', monospace; font-size: 9px; letter-spacing: 0.2em; color: rgba(29,29,31,0.25); }

nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 999;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.corner-mark { position: absolute; width: 8px; height: 8px; }
.corner-mark.tl { top: -1px; left: -1px; border-top: 1px solid var(--black); border-left: 1px solid var(--black); }
.corner-mark.tr { top: -1px; right: -1px; border-top: 1px solid var(--black); border-right: 1px solid var(--black); }
.corner-mark.bl { bottom: -1px; left: -1px; border-bottom: 1px solid var(--black); border-left: 1px solid var(--black); }
.corner-mark.br { bottom: -1px; right: -1px; border-bottom: 1px solid var(--black); border-right: 1px solid var(--black); }

.section-wrap { padding: 80px 0; position: relative; z-index: 1; }

@keyframes ticker { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.ticker-inner { animation: ticker 30s linear infinite; white-space: nowrap; display: inline-flex; }

@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0} }
.cursor { display: inline-block; width: 2px; height: 1em; background: var(--black); vertical-align: text-bottom; animation: blink 1s step-end infinite; margin-left: 2px; }

/* ================= 响应式与汉堡菜单 ================= */
.desktop-nav { display: flex; gap: 40px; align-items: center; }
.mobile-nav-btn { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.mobile-nav-btn svg { width: 24px; height: 24px; }

.mobile-menu {
  display: none; flex-direction: column;
  background: rgba(255,255,255,0.98);
  border-bottom: 1px solid var(--line);
  padding: 20px 32px; gap: 20px;
}
.mobile-menu.active { display: flex; }

@media (max-width: 768px) {
  .desktop-nav { display: none; }
  .mobile-nav-btn { display: block; }
  /* 日志卡片在手机端也变成单列 */
  #log > div:nth-child(2) { grid-template-columns: 1fr; } 
}