/* ============================================================
   基础样式 — reset / 排版 / 布局骨架 / 导航 / 页脚
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background:
    radial-gradient(64rem 50rem at 88% 4%, oklch(0.62 0.14 175 / 0.10), transparent 60%),
    radial-gradient(56rem 46rem at 2% 62%, oklch(0.58 0.16 320 / 0.09), transparent 62%),
    radial-gradient(50rem 42rem at 60% 108%, oklch(0.72 0.15 80 / 0.08), transparent 58%),
    var(--bg);
  background-attachment: fixed;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}
@media (max-width: 900px) { body { background-attachment: scroll; } }

img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
input, select { font: inherit; color: inherit; }
table { border-collapse: collapse; width: 100%; }

h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -0.015em; text-wrap: balance; }
p { margin: 0; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

::selection { background: var(--primary-wash-strong); color: var(--ink); }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface-3); border-radius: var(--r-pill); border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--primary-deep); }

/* ---------- 蓝图网格背景 ---------- */
.blueprint-grid {
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.55;
}
.blueprint-grid.fine {
  background-size: 8px 8px;
  opacity: 0.35;
}

/* ---------- 布局容器 ---------- */
.shell { max-width: var(--content-max); margin: 0 auto; padding: 0 var(--sp-7); }
@media (max-width: 720px) { .shell { padding: 0 var(--sp-4); } }

.section { padding-block: var(--sp-10); }
.section + .section { padding-top: 0; }
.section-head {
  display: flex; align-items: flex-end; justify-content: space-between;
  gap: var(--sp-5); margin-bottom: var(--sp-6); flex-wrap: wrap;
}
.section-title { font-size: clamp(1.6rem, 1.3rem + 1.3vw, 2.4rem); letter-spacing: -0.02em; }
.section-sub { color: var(--muted); font-size: 0.9rem; margin-top: var(--sp-2); }

/* ---------- 顶部导航 ---------- */
.topbar {
  position: sticky; top: 0; z-index: var(--z-sticky);
  background: oklch(0.150 0.02 235 / 0.55);
  backdrop-filter: blur(22px) saturate(1.7);
  -webkit-backdrop-filter: blur(22px) saturate(1.7);
  border-bottom: 1px solid var(--glass-border);
}
.topbar-inner {
  max-width: var(--content-max); margin: 0 auto; padding: 0 var(--sp-7);
  height: 76px; display: flex; align-items: center; gap: var(--sp-7);
}
@media (max-width: 720px) {
  .topbar-inner {
    padding: var(--sp-2) var(--sp-4); gap: var(--sp-2);
    height: auto; flex-wrap: wrap;
  }
}

.brand { display: flex; align-items: center; gap: var(--sp-3); flex-shrink: 0; }
.brand-mark { width: 40px; height: 40px; color: var(--primary); flex-shrink: 0; filter: drop-shadow(0 0 12px var(--primary-wash-strong)); }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-major { font-weight: 700; font-size: 1.05rem; letter-spacing: -0.01em; }
.brand-sub { font-size: 0.68rem; color: var(--muted); font-family: var(--font-mono); letter-spacing: 0.04em; }
@media (max-width: 720px) { .brand-sub { display: none; } }

.nav-links { display: flex; align-items: center; gap: var(--sp-1); flex: 1; overflow-x: auto; scrollbar-width: none; min-width: 0; }
.nav-links::-webkit-scrollbar { display: none; }
@media (max-width: 720px) {
  .nav-links { order: 3; flex-basis: 100%; width: 100%; padding-bottom: var(--sp-1); }
}
.nav-link {
  padding: var(--sp-2) var(--sp-4); border-radius: var(--r-md);
  font-size: 0.86rem; color: var(--muted); white-space: nowrap;
  transition: color 0.2s var(--ease-out-expo), background-color 0.2s var(--ease-out-expo);
}
.nav-link:hover { color: var(--ink); background: var(--surface-2); }
.nav-link.active { color: var(--primary); background: var(--primary-wash); font-weight: 600; }

.topbar-actions { display: flex; align-items: center; gap: var(--sp-3); flex-shrink: 0; }
.user-chip {
  display: flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-1) var(--sp-3) var(--sp-1) var(--sp-1);
  border-radius: var(--r-pill); background: var(--surface-2); border: 1px solid var(--border-soft);
  font-size: 0.8rem; color: var(--ink-2);
}
.user-chip .avatar {
  width: 26px; height: 26px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary-dim), var(--primary));
  display: flex; align-items: center; justify-content: center;
  font-size: 0.7rem; font-weight: 700; color: var(--bg);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-5); border-radius: var(--r-md);
  font-size: 0.85rem; font-weight: 600; white-space: nowrap;
  transition: transform 0.2s var(--ease-out-expo), background-color 0.2s var(--ease-out-expo), border-color .2s var(--ease-out-expo);
  border: 1px solid transparent;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--primary); color: oklch(0.15 0.02 235); }
.btn-primary:hover { background: var(--primary-dim); }
.btn-ghost { background: var(--surface-2); border-color: var(--border); color: var(--ink-2); }
.btn-ghost:hover { border-color: var(--border-strong); color: var(--ink); }
.btn-sm { padding: 6px var(--sp-3); font-size: 0.78rem; border-radius: var(--r-sm); }

/* ---------- 徽章 ---------- */
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px; border-radius: var(--r-pill);
  font-size: 0.7rem; font-weight: 600; font-family: var(--font-mono);
  border: 1px solid transparent;
}
.badge-primary { background: var(--primary-wash); color: var(--primary); border-color: color-mix(in oklch, var(--primary) 35%, transparent); }
.badge-accent  { background: var(--accent-wash); color: var(--accent); border-color: color-mix(in oklch, var(--accent) 35%, transparent); }
.badge-muted   { background: var(--surface-3); color: var(--muted); }
.badge-good    { background: var(--status-good-wash); color: var(--status-good); }
.badge-warning { background: var(--status-warning-wash); color: var(--status-warning); }
.badge-serious { background: var(--status-serious-wash); color: var(--status-serious); }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border-soft);
  padding: var(--sp-9) 0 var(--sp-8);
  margin-top: var(--sp-11);
  color: var(--muted);
  font-size: 0.8rem;
}
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: var(--sp-4); }
.footer-links { display: flex; gap: var(--sp-5); flex-wrap: wrap; }
.footer-links a:hover { color: var(--ink-2); }

/* ---------- 工具类 ---------- */
.text-muted { color: var(--muted); }
.text-primary { color: var(--primary); }
.text-accent { color: var(--accent); }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--sp-2); } .gap-3 { gap: var(--sp-3); } .gap-4 { gap: var(--sp-4); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- 进场动效 ---------- */
@keyframes rise-in {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.rise-in { animation: rise-in 0.5s var(--ease-out-expo) both; }
@media (prefers-reduced-motion: reduce) {
  .rise-in { animation: none; opacity: 1; transform: none; }
}