@font-face {
  font-family: "Noto Sans SC";
  src: url("/assets/fonts/NotoSansSC-Regular.otf") format("opentype");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  color-scheme: light dark;
  --paper: #f4f0e5;
  --paper-deep: #e9e1cf;
  --ink: #171914;
  --muted: #5c6156;
  --line: rgba(23, 25, 20, 0.18);
  --panel: rgba(255, 252, 243, 0.72);
  --accent: #b96516;
  --accent-ink: #fff8ea;
  --good: #2f6e52;
  --warning: #956516;
  --danger: #9f3f35;
  --radius-card: 16px;
  --radius-control: 8px;
  --max: 1240px;
  font-family: "Noto Sans SC", Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); line-height: 1.65; }
body::before { content: ""; position: fixed; inset: 0; pointer-events: none; opacity: .27; background-image: radial-gradient(rgba(23,25,20,.16) .45px, transparent .65px); background-size: 5px 5px; mix-blend-mode: multiply; }
a { color: inherit; text-underline-offset: .22em; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 99; padding: 9px 13px; background: var(--ink); color: var(--paper); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.site-header { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; min-height: 74px; display: flex; align-items: center; justify-content: space-between; gap: 28px; border-bottom: 1px solid var(--line); }
.brand { font-family: ui-serif, Georgia, "Noto Sans SC", "Songti SC", serif; font-weight: 800; font-size: 1.1rem; text-decoration: none; letter-spacing: -.02em; }
.site-header nav { display: flex; gap: 22px; font-size: .86rem; font-weight: 700; }
.site-header nav a { text-decoration: none; color: var(--muted); }
.site-header nav a:hover, .site-header nav a:focus-visible { color: var(--accent); }
main { width: min(var(--max), calc(100% - 32px)); margin: 0 auto; }
.hero { min-height: 680px; display: grid; grid-template-columns: minmax(0, 1.45fr) minmax(310px, .55fr); gap: clamp(40px, 8vw, 118px); align-items: center; padding: 96px 0 72px; }
.kicker { margin: 0 0 14px; color: var(--accent); text-transform: uppercase; font-weight: 850; font-size: .76rem; letter-spacing: .15em; }
h1, h2, h3 { margin-top: 0; line-height: 1.1; }
h1, h2 { font-family: ui-serif, Georgia, "Noto Sans SC", "Songti SC", serif; letter-spacing: -.045em; }
h1 { max-width: 800px; margin-bottom: 28px; font-size: clamp(3.1rem, 7vw, 6.75rem); font-weight: 900; }
.hero-line { white-space: nowrap; }
h1 mark { color: var(--accent); background: transparent; }
.dek { max-width: 760px; margin: 0; color: var(--muted); font-size: clamp(1.08rem, 1.7vw, 1.34rem); }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 34px; }
.button { min-height: 44px; display: inline-flex; align-items: center; justify-content: center; padding: 10px 16px; border: 1px solid var(--line); border-radius: var(--radius-control); background: transparent; color: var(--ink); text-decoration: none; font-weight: 800; cursor: pointer; }
.button:hover, .button:focus-visible { border-color: var(--accent); color: var(--accent); }
.button.primary { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); }
.button.primary:hover, .button.primary:focus-visible { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.verdict-card { align-self: end; margin-bottom: 18px; padding: 28px; border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--panel); box-shadow: 0 20px 60px rgba(55, 42, 20, .08); }
.stamp { width: fit-content; margin: 0 0 24px; padding: 5px 9px; border: 1px solid var(--accent); color: var(--accent); font-size: .74rem; font-weight: 900; letter-spacing: .12em; }
.verdict-card > strong { display: block; font-family: ui-serif, Georgia, "Noto Sans SC", "Songti SC", serif; font-size: 1.9rem; line-height: 1.18; }
.verdict-card > p:not(.stamp) { color: var(--muted); }
.confidence { display: flex; flex-wrap: wrap; gap: 7px; align-items: center; padding-top: 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: .75rem; }
.confidence span { width: 24px; height: 24px; display: inline-grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--paper); font-weight: 900; }
.headline-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.headline-grid article { min-height: 168px; display: flex; flex-direction: column; padding: 24px; border-right: 1px solid var(--line); }
.headline-grid article:first-child { padding-left: 0; }
.headline-grid article:last-child { padding-right: 0; border-right: 0; }
.headline-grid span, .headline-grid small { color: var(--muted); }
.headline-grid strong { margin: auto 0 2px; font-family: ui-serif, Georgia, serif; font-size: clamp(2rem, 3.5vw, 4.2rem); line-height: 1; letter-spacing: -.05em; color: var(--accent); }
.headline-grid small { font-size: .78rem; }
.callout { margin: 72px 0 0; padding: 34px; display: grid; grid-template-columns: .75fr 1.25fr; gap: 50px; border: 1px solid var(--danger); border-radius: var(--radius-card); background: color-mix(in srgb, var(--danger) 7%, transparent); }
.callout h2 { margin-bottom: 0; font-size: clamp(2rem, 4vw, 3.8rem); }
.callout > p { margin: 0; align-self: center; }
.callout a { display: block; width: fit-content; margin-top: 12px; font-weight: 800; }
.section { padding: 112px 0 0; }
.section-heading { max-width: 820px; margin-bottom: 38px; }
.section-heading h2 { margin-bottom: 15px; font-size: clamp(2.6rem, 5.2vw, 5.2rem); }
.section-heading > p:last-child { color: var(--muted); font-size: 1.04rem; }
.split-heading { max-width: none; display: grid; grid-template-columns: 1.3fr .7fr; gap: 64px; align-items: end; }
.changsha-grid { display: grid; grid-template-columns: 1.25fr 1fr 1fr; gap: 16px; }
.recommendation { min-height: 320px; padding: 26px; display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--panel); }
.recommendation.featured { color: var(--accent-ink); background: var(--ink); }
.rank-label { margin-bottom: 42px; color: var(--accent); font-weight: 900; font-size: .74rem; letter-spacing: .1em; }
.recommendation h3 { max-width: 300px; font-size: 1.55rem; }
.recommendation strong { margin: auto 0 8px; font-family: ui-serif, Georgia, serif; font-size: 2.4rem; line-height: 1; }
.recommendation p { margin: 0; color: var(--muted); font-size: .9rem; }
.recommendation.featured p { color: rgba(255,248,234,.72); }
.field-check { margin-top: 16px; padding: 30px; display: grid; grid-template-columns: .6fr 1.4fr; gap: 40px; border: 1px solid var(--line); border-radius: var(--radius-card); }
.field-check h3 { font-size: 1.4rem; }
.field-check ol { margin: 0; padding-left: 1.25rem; }
.field-check li + li { margin-top: 10px; }
.ranking-list { border-top: 1px solid var(--ink); }
.rank-row { display: grid; grid-template-columns: 56px minmax(0, 1fr) 250px 42px; gap: 22px; align-items: center; min-height: 132px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.rank-row > b { font-family: ui-serif, Georgia, serif; font-size: 1.8rem; color: var(--muted); }
.rank-row h3 { margin-bottom: 8px; font-size: 1.16rem; }
.rank-row p { margin: 0; color: var(--muted); font-size: .88rem; }
.rank-row > div:nth-of-type(2) { text-align: right; }
.rank-row > div:nth-of-type(2) strong, .rank-row > div:nth-of-type(2) span { display: block; }
.rank-row > div:nth-of-type(2) strong { font-family: ui-serif, Georgia, serif; font-size: 1.42rem; }
.rank-row > div:nth-of-type(2) span { color: var(--muted); font-size: .76rem; }
.rank-row.best { background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 9%, transparent), transparent 58%); }
.grade { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; font-style: normal; font-weight: 900; font-size: .78rem; }
.grade-a { background: var(--good); color: white; }.grade-b { background: var(--warning); color: white; }.grade-c { border: 1px solid var(--line); color: var(--muted); }
.note { color: var(--muted); font-size: .82rem; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.long-term-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--line); }
.long-term-grid article { min-height: 220px; padding: 25px; display: flex; flex-direction: column; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.long-term-grid span { color: var(--muted); font-size: .78rem; font-weight: 800; }
.long-term-grid strong { margin: auto 0 10px; font-family: ui-serif, Georgia, "Noto Sans SC", serif; font-size: 1.45rem; }
.long-term-grid p { margin: 0; color: var(--muted); font-size: .82rem; }
.filter { min-height: 40px; padding: 8px 13px; border: 1px solid var(--line); border-radius: var(--radius-control); background: transparent; color: var(--muted); font-weight: 800; cursor: pointer; }
.filter.active, .filter:hover, .filter:focus-visible { border-color: var(--ink); background: var(--ink); color: var(--paper); }
.table-wrap { overflow-x: auto; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
table { min-width: 1500px; width: 100%; border-collapse: collapse; font-size: .78rem; line-height: 1.45; }
th, td { padding: 15px 12px; vertical-align: top; text-align: left; border-bottom: 1px solid var(--line); }
thead th { position: sticky; top: 0; z-index: 2; color: var(--muted); background: var(--paper-deep); font-size: .7rem; letter-spacing: .06em; }
tbody th { position: sticky; left: 0; z-index: 1; min-width: 155px; background: var(--paper); font-size: .82rem; }
tbody tr:hover td, tbody tr:hover th { background: color-mix(in srgb, var(--accent) 7%, var(--paper)); }
tbody tr[hidden] { display: none; }
.status { display: inline-grid; min-width: 30px; min-height: 26px; place-items: center; border-radius: 999px; color: white; font-weight: 900; }
.status.a { background: var(--good); }.status.b { background: var(--warning); }.status.c { background: var(--muted); }.status.old { background: var(--danger); }
.calc-section { margin-top: 112px; padding: 82px 50px; border-radius: var(--radius-card); background: var(--ink); color: var(--paper); }
.calc-section .section-heading { padding-top: 0; }
.calc-section .section-heading > p:last-child { color: rgba(244,240,229,.68); }
.calculator-layout { display: grid; grid-template-columns: .75fr 1.25fr; gap: 48px; }
.calc-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-content: start; }
.calc-form label { display: block; }
.calc-form label > span { display: block; margin-bottom: 7px; font-size: .79rem; font-weight: 800; }
.calc-form label > small { display: block; margin-top: 5px; color: rgba(244,240,229,.54); font-size: .7rem; }
.calc-form input { width: 100%; min-height: 48px; padding: 10px 12px; border: 1px solid rgba(244,240,229,.25); border-radius: var(--radius-control); background: rgba(255,255,255,.07); color: white; }
.calc-form input:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.input-unit { position: relative; }
.input-unit input { padding-right: 42px; }
.input-unit i { position: absolute; right: 12px; top: 12px; font-style: normal; color: rgba(244,240,229,.55); }
.calc-form .button { align-self: end; }
.calc-results { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.calc-results article { min-height: 178px; padding: 22px; display: flex; flex-direction: column; border: 1px solid rgba(244,240,229,.18); border-radius: var(--radius-card); }
.calc-results article.highlight { border-color: var(--accent); background: rgba(185,101,22,.11); }
.calc-results article span { color: rgba(244,240,229,.65); font-size: .78rem; }
.calc-results article strong { margin-top: auto; font-family: ui-serif, Georgia, serif; font-size: 2.6rem; line-height: 1; color: var(--accent); }
.calc-results article i { font-style: normal; font-size: .76rem; color: rgba(244,240,229,.55); }
.calc-results article p { margin: 9px 0 0; font-size: .75rem; color: rgba(244,240,229,.58); }
.break-even { grid-column: 1 / -1; padding: 16px; border-left: 3px solid var(--accent); background: rgba(255,255,255,.05); font-size: .86rem; }
.capacity-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.capacity-grid article { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--panel); }
.capacity-grid article > div { display: flex; justify-content: space-between; color: var(--muted); font-size: .82rem; }
.capacity-grid article > strong { display: block; margin: 54px 0 12px; font-family: ui-serif, Georgia, serif; font-size: 2.2rem; }
.capacity-grid article > p { color: var(--muted); font-size: .86rem; }
.formula-board { margin-top: 16px; padding: 32px; display: grid; grid-template-columns: .65fr repeat(3, 1fr); gap: 20px; align-items: center; border: 1px solid var(--line); border-radius: var(--radius-card); }
.formula-board h3 { margin: 0; }
.formula-board div { padding-left: 20px; border-left: 1px solid var(--line); }
.formula-board div span, .formula-board div strong { display: block; }
.formula-board div span { color: var(--muted); font-size: .76rem; }
.formula-board div strong { font-size: .98rem; }
.formula-board p { grid-column: 1 / -1; margin: 12px 0 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); }
.energy-layout { display: grid; grid-template-columns: .7fr 1.3fr; gap: 36px; }
.equation { border-top: 1px solid var(--ink); }
.equation p { margin: 0; padding: 17px 0; display: flex; justify-content: space-between; gap: 25px; border-bottom: 1px solid var(--line); }
.equation span { color: var(--muted); font-size: .82rem; }
.equation strong { text-align: right; }
.cost-stack { display: flex; min-height: 310px; border-radius: var(--radius-card); overflow: hidden; }
.cost-stack div { flex: var(--share); min-width: 90px; padding: 18px 12px; display: flex; flex-direction: column; justify-content: flex-end; background: color-mix(in srgb, var(--accent) calc(var(--share) + 7%), var(--paper-deep)); border-right: 1px solid var(--paper); }
.cost-stack span, .cost-stack b { display: block; }
.cost-stack span { margin-bottom: 8px; font-size: .72rem; }
.cost-stack b { font-size: .88rem; }
.loophole-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--line); }
.loophole-grid article { min-height: 260px; padding: 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.loophole-grid article > span { color: var(--accent); font-family: ui-serif, Georgia, serif; font-size: 1.6rem; }
.loophole-grid h3 { margin: 42px 0 12px; font-size: 1.25rem; }
.loophole-grid p { margin: 0; color: var(--muted); font-size: .86rem; }
.decision-table { border-top: 1px solid var(--ink); }
.decision-table > div { display: grid; grid-template-columns: 150px minmax(250px, .85fr) 1.15fr; gap: 36px; padding: 26px 0; border-bottom: 1px solid var(--line); }
.decision-table span { color: var(--accent); font-weight: 900; font-size: .8rem; }
.decision-table strong { font-family: ui-serif, Georgia, "Noto Sans SC", "Songti SC", serif; font-size: 1.3rem; }
.decision-table p { margin: 0; color: var(--muted); }
.source-list { border-top: 1px solid var(--ink); }
.source-list article { display: grid; grid-template-columns: 44px minmax(0, 1fr) 210px; gap: 22px; padding: 23px 0; border-bottom: 1px solid var(--line); }
.source-list article > b { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--paper); }
.source-list h3 { margin-bottom: 7px; font-size: 1rem; }
.source-list p { margin: 0 0 7px; color: var(--muted); font-size: .84rem; }
.source-list a { font-size: .8rem; font-weight: 800; }
.source-list time { color: var(--muted); font-size: .76rem; text-align: right; }
.method { margin: 112px 0 70px; padding: 34px; border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--panel); }
.method h2 { font-size: 1.7rem; }
.method p { max-width: 980px; color: var(--muted); font-size: .86rem; }
footer { width: min(var(--max), calc(100% - 32px)); min-height: 120px; margin: 0 auto; display: flex; align-items: center; gap: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: .82rem; }
footer p { margin-right: auto; }

@media (prefers-color-scheme: dark) {
  :root { --paper: #11130f; --paper-deep: #1a1d17; --ink: #f0eadc; --muted: #a7aa9e; --line: rgba(240,234,220,.17); --panel: rgba(26,29,23,.8); --accent: #de8a33; --accent-ink: #17120b; }
  body::before { opacity: .13; mix-blend-mode: screen; }
  .verdict-card { box-shadow: 0 20px 70px rgba(0,0,0,.26); }
  .recommendation.featured, .calc-section { background: #ece4d3; color: #161812; }
  .recommendation.featured p { color: #5a5f54; }
  .calc-section .section-heading > p:last-child { color: #666b60; }
  .calc-form label > small { color: #73786d; }
  .calc-form input { border-color: rgba(22,24,18,.22); background: rgba(22,24,18,.06); color: #161812; }
  .input-unit i { color: #686d62; }
  .calc-results article { border-color: rgba(22,24,18,.18); }
  .calc-results article span, .calc-results article i, .calc-results article p { color: #686d62; }
  .break-even { background: rgba(22,24,18,.05); }
}

@media (max-width: 920px) {
  .hero { min-height: auto; grid-template-columns: 1fr; gap: 42px; padding-top: 74px; }
  .verdict-card { align-self: auto; margin: 0; }
  .headline-grid { grid-template-columns: 1fr 1fr; }
  .headline-grid article:nth-child(2) { border-right: 0; }
  .headline-grid article:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .headline-grid article:first-child, .headline-grid article:last-child { padding: 24px; }
  .callout, .split-heading, .field-check, .calculator-layout, .energy-layout { grid-template-columns: 1fr; }
  .changsha-grid { grid-template-columns: 1fr; }
  .recommendation { min-height: 260px; }
  .rank-row { grid-template-columns: 46px minmax(0, 1fr) 34px; }
  .rank-row > div:nth-of-type(2) { grid-column: 2; text-align: left; }
  .grade { grid-column: 3; grid-row: 1; }
  .formula-board { grid-template-columns: 1fr; }
  .formula-board div { padding: 12px 0 0; border-left: 0; border-top: 1px solid var(--line); }
  .formula-board p { grid-column: 1; }
  .cost-stack { min-height: 260px; overflow-x: auto; }
  .loophole-grid { grid-template-columns: 1fr 1fr; }
  .long-term-grid { grid-template-columns: 1fr 1fr; }
  .decision-table > div { grid-template-columns: 120px 1fr; }
  .decision-table p { grid-column: 2; }
}

@media (max-width: 640px) {
  .site-header { min-height: 62px; }
  .site-header nav { gap: 13px; font-size: .75rem; }
  .site-header nav a:nth-child(3), .site-header nav a:nth-child(4) { display: none; }
  .hero { padding: 58px 0 52px; }
  h1 { font-size: clamp(2.7rem, 11.8vw, 3.5rem); }
  .headline-grid { grid-template-columns: 1fr; }
  .headline-grid article, .headline-grid article:first-child, .headline-grid article:last-child { min-height: 134px; padding: 20px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .callout { margin-top: 52px; padding: 24px; gap: 24px; }
  .section { padding-top: 82px; }
  .section-heading h2 { font-size: clamp(2.45rem, 13vw, 3.8rem); }
  .field-check, .recommendation, .formula-board, .method { padding: 22px; }
  .rank-row { gap: 12px; }
  .rank-row > b { font-size: 1.2rem; }
  .rank-row h3 { font-size: 1rem; }
  .calc-section { margin-left: -16px; margin-right: -16px; padding: 64px 16px; border-radius: 0; }
  .calc-form, .calc-results, .capacity-grid { grid-template-columns: 1fr; }
  .capacity-grid article > strong { margin-top: 36px; }
  .cost-stack { display: block; min-height: auto; }
  .cost-stack div { min-height: 84px; border-right: 0; border-bottom: 1px solid var(--paper); }
  .loophole-grid { grid-template-columns: 1fr; }
  .long-term-grid { grid-template-columns: 1fr; }
  .loophole-grid article { min-height: 220px; }
  .decision-table > div { grid-template-columns: 1fr; gap: 10px; }
  .decision-table p { grid-column: 1; }
  .source-list article { grid-template-columns: 38px minmax(0,1fr); }
  .source-list time { grid-column: 2; text-align: left; }
  footer { align-items: flex-start; flex-wrap: wrap; padding: 28px 0; }
  footer p { width: 100%; margin: 0; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

@media print {
  :root { color-scheme: light; --paper: white; --ink: black; --muted: #444; --line: #bbb; --panel: white; }
  body::before, .site-header, .hero-actions, .filters, footer { display: none; }
  main { width: 100%; }
  .hero { min-height: auto; padding: 20px 0; }
  .section { break-inside: avoid; padding-top: 48px; }
  .table-wrap { overflow: visible; }
  table { min-width: 0; font-size: 7pt; }
}