:root {
  --bg: #FAFBFD;
  --bg-pure: #FFFFFF;
  --ink: #0B2B45;
  --ink-soft: #3D5A73;
  --ink-faint: #7A93A8;
  --energy: #00C2D1;
  --energy-deep: #0891B2;
  --energy-glow: rgba(0,194,209,0.14);
  --save: #0FB981;
  --save-deep: #0B8A63;
  --cost: #F59E0B;
  --cost-deep: #B45309;
  --danger: #E11D48;
  --line: rgba(11,43,69,0.08);
  --line-strong: rgba(11,43,69,0.16);
  --font-sans: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'JetBrains Mono', Menlo, Consolas, 'Courier New', monospace;
  --nav-h: 72px;
  --max-w: 1400px;
  --radius: 16px;
  --radius-sm: 10px;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --shadow-card: 0 1px 2px rgba(11,43,69,0.04), 0 8px 32px rgba(11,43,69,0.06);
  --shadow-lift: 0 2px 4px rgba(11,43,69,0.05), 0 20px 60px rgba(0,194,209,0.12);
  --grad-dark: linear-gradient(135deg, #0B2B45 0%, #0E3D60 60%, #0A4A5E 100%);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
}
::selection { background: var(--energy); color: #fff; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: rgba(11,43,69,0.18); border-radius: 8px; }
::-webkit-scrollbar-track { background: transparent; }
a { color: var(--energy-deep); text-decoration: none; }

/* 精密网格背景 */
.grid-bg {
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(rgba(11,43,69,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(11,43,69,0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 20%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 20%, #000 30%, transparent 75%);
  opacity: 0.55;
}

/* 导航 */
nav.topnav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center; gap: 18px;
  padding: 0 28px;
  background: rgba(255,255,255,0.78);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  width: 38px; height: 38px; border-radius: 12px;
  background: linear-gradient(135deg, var(--ink), var(--energy-deep));
  color: #fff; font-weight: 800; font-size: 15px;
  display: flex; align-items: center; justify-content: center;
  letter-spacing: 0.02em; font-family: var(--font-mono);
}
.brand-name { font-size: 16.5px; font-weight: 700; line-height: 1.25; }
.brand-sub { font-size: 10px; font-family: var(--font-mono); letter-spacing: 0.18em; color: var(--ink-faint); text-transform: uppercase; }
nav .links, nav .nav-links { display: flex; gap: 4px; margin-left: 14px; }
nav .links a, nav .nav-links a {
  position: relative; padding: 8px 14px; border-radius: 999px;
  color: var(--ink-soft); font-size: 14px; font-weight: 500;
  transition: color 0.3s var(--ease-out);
}
nav .links a:hover, nav .nav-links a:hover { color: var(--energy-deep); background: var(--energy-glow); }
nav .links a.active, nav .nav-links a.active { color: var(--energy-deep); background: var(--energy-glow); font-weight: 600; }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.plan-switch {
  display: inline-flex; align-items: center; gap: 2px;
  background: var(--bg-pure);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 3px;
}
.plan-switch button {
  border: 0; background: transparent;
  padding: 5px 12px; border-radius: 999px;
  font-size: 12.5px; font-weight: 600;
  color: var(--ink-soft); cursor: pointer;
  white-space: nowrap;
  transition: color 0.25s var(--ease-out), background 0.25s var(--ease-out);
}
.plan-switch button.active { background: var(--energy); color: #fff; }
.plan-switch button:hover:not(.active) { background: var(--energy-glow); color: var(--energy-deep); }
.pill-status {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 6px 14px; border-radius: 999px;
  border: 1px solid var(--line-strong);
  font-size: 12.5px; font-family: var(--font-mono); color: var(--ink-soft);
  background: var(--bg-pure);
}
.dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--energy); box-shadow: 0 0 10px var(--energy);
  animation: breathe 2.2s infinite;
}
.dot.save { background: var(--save); box-shadow: 0 0 10px var(--save); }
.dot.cost { background: var(--cost); box-shadow: 0 0 10px var(--cost); }
@keyframes breathe { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }
/* 移动端导航：汉堡按钮 + 右侧抽屉 */
.nav-burger {
  display: none; margin-left: auto; flex: none;
  width: 42px; height: 42px; border-radius: 11px;
  border: 1px solid var(--line-strong); background: var(--bg-pure);
  align-items: center; justify-content: center; flex-direction: column; gap: 5px;
  cursor: pointer; transition: border-color .2s, background .2s;
}
.nav-burger span { display: block; width: 19px; height: 2.4px; border-radius: 2px; background: var(--ink); transition: transform .25s var(--ease-out), opacity .2s; }
.nav-burger:hover { border-color: var(--energy); }
body.nav-open .nav-burger span:nth-child(1) { transform: translateY(7.4px) rotate(45deg); }
body.nav-open .nav-burger span:nth-child(2) { opacity: 0; }
body.nav-open .nav-burger span:nth-child(3) { transform: translateY(-7.4px) rotate(-45deg); }
.nav-mask {
  position: fixed; inset: 0; z-index: 150; background: rgba(11,43,69,.46);
  opacity: 0; pointer-events: none; transition: opacity .3s ease;
  -webkit-backdrop-filter: blur(2px); backdrop-filter: blur(2px);
}
.nav-drawer {
  position: fixed; top: 0; right: 0; bottom: 0; z-index: 160;
  width: 316px; max-width: 86vw; background: var(--bg-pure);
  transform: translateX(106%); transition: transform .34s var(--ease-out);
  box-shadow: -24px 0 70px rgba(11,43,69,.22);
  display: flex; flex-direction: column; overflow: hidden;
}
body.nav-open .nav-drawer { transform: translateX(0); }
body.nav-open .nav-mask { opacity: 1; pointer-events: auto; }
.drawer-head { display: flex; align-items: center; gap: 11px; padding: 18px 18px 14px; border-bottom: 1px solid var(--line-strong); }
.drawer-close {
  margin-left: auto; flex: none; width: 36px; height: 36px; border-radius: 10px;
  border: 1px solid var(--line-strong); background: var(--bg-pure); color: var(--ink-soft);
  font-size: 20px; line-height: 1; cursor: pointer; transition: color .2s, border-color .2s, transform .2s;
}
.drawer-close:hover { color: var(--danger); border-color: var(--danger); transform: rotate(90deg); }
.drawer-links { flex: 1; overflow-y: auto; padding: 12px 12px; display: flex; flex-direction: column; gap: 4px; }
.drawer-links a {
  display: flex; align-items: center; gap: 11px; padding: 12px 13px; border-radius: 11px;
  font-size: 14.5px; font-weight: 600; color: var(--ink-soft); transition: background .18s, color .18s;
}
.drawer-links a::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%; flex: none;
  background: var(--line-strong); transition: background .18s;
}
.drawer-links a:hover { background: var(--energy-glow); color: var(--energy-deep); }
.drawer-links a.active { background: var(--energy-glow); color: var(--energy-deep); }
.drawer-links a.active::before { background: var(--energy); }
.drawer-foot { padding: 13px 20px; border-top: 1px solid var(--line-strong); font-size: 11px; color: var(--ink-faint); letter-spacing: 1px; }

/* 页脚 */
.site-foot {
  border-top: 1px solid var(--line-strong);
  background: var(--bg-pure);
  margin-top: 8px;
}
.site-foot .foot-inner {
  max-width: var(--max-w); margin: 0 auto; padding: 22px 28px 26px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.site-foot .foot-brand { font-size: 14px; font-weight: 700; color: var(--ink); }
.site-foot .foot-brand small { display: block; font-size: 11px; font-weight: 500; color: var(--ink-faint); margin-top: 2px; letter-spacing: .04em; }
.site-foot .foot-links { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.site-foot .foot-links a { font-size: 12.5px; color: var(--ink-soft); padding: 5px 10px; border-radius: 999px; }
.site-foot .foot-links a:hover { color: var(--energy-deep); background: var(--energy-glow); }
.site-foot .foot-note {
  flex-basis: 100%; font-size: 11.5px; color: var(--ink-faint); line-height: 1.7;
  border-top: 1px dashed var(--line); padding-top: 12px;
}

/* 布局 */
.wrap { max-width: var(--max-w); margin: 0 auto; padding: 26px 28px 90px; }
.page-head {
  margin: 14px 0 26px; position: relative;
  padding: 30px 34px 26px;
  background:
    radial-gradient(720px 200px at 88% -40%, rgba(0,194,209,0.10), transparent 70%),
    linear-gradient(120deg, #FFFFFF 30%, #F3FAFB 100%);
  border: 1px solid var(--line-strong);
  border-radius: 20px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}
.page-head::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px;
  background: linear-gradient(180deg, var(--energy), var(--energy-deep));
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-mono); font-size: 11.5px; letter-spacing: 0.22em;
  color: var(--energy-deep); text-transform: uppercase; margin-bottom: 12px;
}
.eyebrow::before { content: ""; width: 34px; height: 2px; border-radius: 2px; background: linear-gradient(90deg, var(--energy), transparent); }
h1.page-title {
  font-size: clamp(26px, 3.4vw, 38px); font-weight: 800; letter-spacing: 0.01em;
  color: var(--ink);
}
h1.page-title .hl {
  background: linear-gradient(100deg, #0891B2, #00C2D1);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.page-desc { color: var(--ink-soft); max-width: 900px; margin-top: 10px; font-size: 14.5px; }

/* 卡片 */
.card {
  background: var(--bg-pure); border: 1px solid var(--line-strong);
  border-radius: var(--radius); box-shadow: var(--shadow-card);
  padding: 22px 24px; transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out), border-color 0.35s var(--ease-out);
}
.card.hoverable:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); border-color: rgba(8,145,178,0.4); }
.card h3 { font-size: 15.5px; font-weight: 700; margin-bottom: 4px; display: flex; align-items: center; gap: 8px; }
.card h3::before { content: ""; width: 4px; height: 15px; border-radius: 2px; background: linear-gradient(180deg, var(--energy), var(--energy-deep)); flex: none; }
.card .sub { font-size: 12.5px; color: var(--ink-faint); }
.card .head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 10px; }

/* 指标 */
.metric { font-family: var(--font-mono); font-weight: 700; color: var(--ink); line-height: 1.1; }
.metric .u { font-size: 0.38em; color: var(--energy-deep); font-weight: 600; margin-left: 3px; }
.metric-grid {
  display: grid; gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}
.metric-cell { background: var(--bg-pure); padding: 18px 20px; transition: background .25s var(--ease-out); }
.metric-cell:hover { background: #F6FCFD; }
.metric-cell .label { font-size: 12.5px; color: var(--ink-soft); font-weight: 500; }
.metric-cell .num { font-family: var(--font-mono); font-size: 28px; font-weight: 700; color: var(--ink); margin-top: 3px; letter-spacing: -0.01em; }
.metric-cell .num .u { font-size: 12px; color: var(--energy-deep); }
.metric-cell .note { font-size: 11.5px; color: var(--ink-faint); margin-top: 3px; }
.num.save { color: var(--save-deep); } .num.cost { color: var(--cost-deep); } .num.danger { color: var(--danger); }

/* 表格 */
.tbl-wrap { overflow: auto; border: 1px solid var(--line-strong); border-radius: var(--radius); background: var(--bg-pure); }
table.tbl { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.tbl th {
  position: sticky; top: 0; background: #F4FBFC; color: var(--ink-soft);
  font-weight: 600; font-size: 12.5px; text-align: left;
  padding: 11px 14px; border-bottom: 1px solid var(--line-strong);
  white-space: nowrap; font-family: var(--font-mono);
}
table.tbl td { padding: 10px 14px; border-bottom: 1px solid var(--line); color: var(--ink-soft); }
table.tbl tr:last-child td { border-bottom: none; }
table.tbl tbody tr:hover { background: #F2FAFB; }
table.tbl td:first-child { font-weight: 600; color: var(--ink); }
table.tbl tr.total td { background: #F2FAFB; font-weight: 700; color: var(--ink); }
table.tbl td.num, table.tbl th.num { text-align: right; font-family: var(--font-mono); }

/* 标签 */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.06em;
  padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line-strong);
  color: var(--ink-soft); background: var(--bg-pure);
}
.tag::before { content: ""; width: 5px; height: 5px; border-radius: 50%; background: var(--ink-faint); }
.tag.real::before { background: var(--save); }
.tag.sim::before { background: var(--energy); }
.tag.warn::before { background: var(--cost); }
.tag.real { color: var(--save-deep); }
.tag.sim { color: var(--energy-deep); }
.tag.warn { color: var(--cost-deep); }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: none; cursor: pointer; border-radius: 999px;
  padding: 10px 22px; font-size: 13.5px; font-weight: 600;
  transition: all 0.3s var(--ease-out);
  font-family: var(--font-sans);
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--energy-deep); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(8,145,178,0.28); }
.btn-ghost { background: rgba(255,255,255,0.6); border: 1px solid var(--line-strong); color: var(--ink-soft); }
.btn-ghost:hover { border-color: var(--energy); color: var(--energy-deep); }
.btn-cy { background: var(--energy); color: #fff; }
.btn-cy:hover { background: var(--energy-deep); transform: translateY(-2px); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none !important; }

/* 滑块 */
.ctl-row { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.ctl {
  background: var(--bg-pure); border: 1px solid var(--line-strong); border-radius: var(--radius-sm);
  padding: 12px 14px;
}
.ctl .lbl { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 6px; }
.ctl .lbl span:first-child { font-size: 13px; color: var(--ink-soft); font-weight: 500; }
.ctl .lbl b { font-family: var(--font-mono); font-size: 15px; color: var(--energy-deep); }
.ctl input[type=range] {
  width: 100%; height: 4px; -webkit-appearance: none; appearance: none;
  background: linear-gradient(90deg, var(--energy) var(--fill,50%), rgba(11,43,69,0.12) var(--fill,50%));
  border-radius: 4px; outline: none; cursor: pointer;
}
.ctl input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 3px solid var(--energy); box-shadow: 0 0 0 4px var(--energy-glow);
  cursor: grab;
}
.ctl .range-note { font-size: 11px; color: var(--ink-faint); font-family: var(--font-mono); margin-top: 4px; }

/* 分段选择 */
.seg { display: inline-flex; background: rgba(11,43,69,0.05); border-radius: 999px; padding: 3px; gap: 2px; }
.seg button {
  border: none; background: transparent; cursor: pointer;
  padding: 6px 14px; border-radius: 999px; font-size: 12.5px; font-weight: 600;
  color: var(--ink-soft); font-family: var(--font-sans);
  transition: all 0.25s var(--ease-out);
}
.seg button.active { background: var(--bg-pure); color: var(--energy-deep); box-shadow: 0 2px 8px rgba(11,43,69,0.10); }

/* 结论条 */
.concl {
  border: 1px dashed rgba(8,145,178,0.5); background: #F2FAFB;
  border-radius: var(--radius-sm); padding: 12px 16px; font-size: 13.5px; color: var(--ink-soft);
  display: flex; gap: 10px; align-items: baseline;
}
.concl b { color: var(--energy-deep); font-family: var(--font-mono); }
.concl.save { border-color: rgba(11,185,129,0.55); background: #F0FBF6; }
.concl.save b { color: var(--save-deep); }

/* 深色叙事卡 */
.dark-card {
  background: var(--grad-dark); color: #fff; border-radius: var(--radius);
  padding: 26px 28px; position: relative; overflow: hidden;
}
.dark-card::after {
  content: ""; position: absolute; right: -80px; top: -80px; width: 260px; height: 260px;
  background: radial-gradient(circle, rgba(0,194,209,0.35), transparent 65%);
}
.dark-card h3 { color: #fff; font-size: 17px; }
.dark-card .sub { color: rgba(255,255,255,0.62); }
.dark-card .k { font-family: var(--font-mono); color: #7FE9F2; font-size: 11px; letter-spacing: 0.16em; }
.dark-card .big { font-family: var(--font-mono); font-size: clamp(28px, 4vw, 44px); font-weight: 800; color: #fff; margin: 6px 0 2px; }
.dark-card .big .u { font-size: 0.4em; color: #39E6F5; }

/* 图表容器 */
.chart-box { position: relative; width: 100%; }
.chart-box canvas { width: 100%; display: block; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 14px; margin: 10px 0 4px; font-size: 12.5px; color: var(--ink-soft); }
.chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; }

/* 页面两栏 */
.split { display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(320px, 1fr); gap: 22px; align-items: start; }
.stack { display: flex; flex-direction: column; gap: 18px; }

/* 提示 */
.hint { font-size: 12.5px; color: var(--ink-faint); }

@media (max-width: 1080px) {
  .split { grid-template-columns: 1fr; }
  nav .links, nav .nav-links { display: none; }
  .nav-burger { display: inline-flex; }
}
@media (max-width: 640px) {
  :root { --nav-h: 60px; }
  .wrap { padding: 18px 14px 70px; }
  nav.topnav { padding: 0 14px; }
  .brand-name { font-size: 14px; }
  .brand-sub { display: none; }
  .nav-right .pill-status { display: none; }
  .site-foot .foot-links { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}