/* MatterBench 宣传页。网页 + 打印成 A4 宣传单两用。色板沿用 OriginFab 令牌。 */
:root {
  --ink: #16181D;
  --ink-2: #23262D;
  --paper: #F6F6F2;
  --card: #FFFFFF;
  --text: #16181D;
  --text-2: #6B7079;
  --line: #E3E3DE;
  --teal: #1F8FA6;
  --teal-hi: #2BB0C9;
  --lime: #C6F04A;
  --orange: #F28B2E;
  --font: "Inter", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, Menlo, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--text); font: 16px/1.7 var(--font); -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
/* 网格子项默认最小宽 = 内容宽,大 SVG 会把整页撑出屏幕 */
.hero-grid > *, .two > *, .partners > *, .flow > * { min-width: 0; }
.hero-art svg { width: 100%; height: auto; }
a { color: inherit; }
p { margin: 0 0 1em; }
.wrap { width: min(1160px, 100% - 32px); margin: 0 auto; }
.en { color: var(--text-2); font-size: .92em; line-height: 1.6; }
.dark .en { color: #9CA1AA; }
.kicker { font: 600 12px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--teal); display: inline-flex; gap: 10px; align-items: center; }
.kicker::before { content: ""; width: 22px; height: 2px; background: currentColor; }
.dark .kicker { color: var(--lime); }
h1, h2, h3 { margin: 0; line-height: 1.2; letter-spacing: -.01em; }
h2 { font-size: clamp(28px, 3.6vw, 42px); font-weight: 800; margin: 14px 0 6px; }
h2 small { display: block; font: 600 14px var(--mono); letter-spacing: .1em; color: var(--text-2); margin-top: 8px; }
.dark h2 small { color: #9CA1AA; }
section { padding: 96px 0; }

/* ---- 顶栏 ---- */
.top { position: sticky; top: 0; z-index: 20; background: rgba(22, 24, 29, .86); backdrop-filter: blur(10px); color: #EDEDE8; border-bottom: 1px solid rgba(255, 255, 255, .08); }
.top .wrap { display: flex; align-items: center; gap: 20px; height: 60px; }
.mark { display: flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; letter-spacing: -.01em; }
.mark img { width: 28px; height: 28px; }
.mark span { font: 500 12px var(--mono); color: #9CA1AA; }
.top nav { display: flex; gap: 4px; margin-left: auto; }
.top nav a { text-decoration: none; font-size: 14px; color: #B8BCC4; padding: 7px 12px; border-radius: 8px; }
.top nav a:hover { color: #fff; background: rgba(255, 255, 255, .06); }
.btn { display: inline-flex; align-items: center; gap: 8px; height: 46px; padding: 0 22px; border-radius: 999px; font: 700 15px var(--font); text-decoration: none; border: 1px solid transparent; transition: transform .12s; }
.btn:active { transform: translateY(1px); }
.btn-lime { background: var(--lime); color: var(--ink); }
.btn-line { border-color: rgba(255, 255, 255, .22); color: #EDEDE8; }
.btn-line:hover { background: rgba(255, 255, 255, .06); }
.btn-dark { background: var(--ink); color: #fff; }
.btn-sm { height: 36px; padding: 0 16px; font-size: 13px; }

/* ---- 首屏 ---- */
.dark { background: var(--ink); color: #EDEDE8; }
.hero { padding: 72px 0 88px; overflow: hidden; position: relative; }
.hero::before { /* 背景格子:精密网格 */
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 32px 32px; mask-image: linear-gradient(180deg, #000 40%, transparent);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; position: relative; }
.hero h1 { font-size: clamp(48px, 7.4vw, 92px); font-weight: 850; letter-spacing: -.035em; line-height: 1; }
.hero h1 b { color: var(--lime); font-weight: 850; }
.hero .sub { font-size: clamp(20px, 2.4vw, 28px); font-weight: 700; margin: 18px 0 2px; }
.hero .sub-en { font: 500 15px var(--mono); color: #9CA1AA; letter-spacing: .02em; }
.hero .lead { margin: 30px 0 8px; font-size: clamp(22px, 2.6vw, 30px); font-weight: 800; color: #fff; }
.hero .lead-en { color: var(--teal-hi); font-weight: 600; margin-bottom: 22px; }
.points { list-style: none; padding: 0; margin: 0 0 28px; display: grid; gap: 8px; }
.points li { display: flex; gap: 12px; align-items: center; font-weight: 600; }
.points li i { width: 26px; height: 26px; border-radius: 8px; display: grid; place-items: center; font: 700 12px var(--mono); font-style: normal; color: var(--ink); flex: none; }
.points li:nth-child(1) i { background: var(--lime); }
.points li:nth-child(2) i { background: var(--teal-hi); }
.points li:nth-child(3) i { background: var(--orange); }
.points-en { font-size: 14px; max-width: 520px; margin-bottom: 30px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-art { position: relative; }
.hero-art figure { margin: 0; }

/* ---- 项目介绍 ---- */
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 32px; }
.two p { font-size: 17px; }
.flow { list-style: none; padding: 0; margin: 48px 0 0; display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; counter-reset: s; border: 1px solid var(--line); border-radius: 16px; background: var(--card); overflow: hidden; }
.flow li { padding: 22px 20px; border-right: 1px solid var(--line); position: relative; }
.flow li:last-child { border-right: 0; background: var(--ink); color: #EDEDE8; }
.flow li::before { counter-increment: s; content: "0" counter(s); display: block; font: 700 12px var(--mono); color: var(--teal); margin-bottom: 10px; }
.flow li:last-child::before { content: "+"; color: var(--lime); }
.flow b { display: block; font-size: 16px; }
.flow span { font-size: 13px; color: var(--text-2); }
.flow li:last-child span { color: #9CA1AA; }

/* ---- 合作 ---- */
.partners { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 36px; }
.partner { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 24px 24px 22px; display: grid; grid-template-columns: 52px 1fr; gap: 16px; }
.partner .ico { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; }
.partner .ico svg { width: 26px; height: 26px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.partner h3 { font-size: 18px; }
.partner h3 small { display: block; font: 500 13px var(--mono); color: var(--text-2); margin: 2px 0 10px; }
.partner p { margin: 0; font-weight: 600; }
.partner p + p { font-weight: 400; }

footer { background: var(--ink); color: #6F747D; font-size: 13px; padding: 26px 0; border-top: 1px solid rgba(255, 255, 255, .06); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }
footer a { color: #9CA1AA; text-decoration: none; }

/* ---- 窄屏 ---- */
@media (max-width: 960px) {
  .hero-grid, .two{ grid-template-columns: 1fr; }
  .flow { grid-template-columns: 1fr 1fr; }
  .flow li { border-bottom: 1px solid var(--line); }
  .flow li:last-child { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  section { padding: 64px 0; }
  .partners { grid-template-columns: 1fr; }
  .partner { grid-template-columns: 1fr; }
  .top nav a.hide-sm { display: none; }
  .top .wrap { gap: 8px; }
  .mark span { display: none; }
  .flow { grid-template-columns: 1fr; }
  .flow li { border-right: 0; }
}

/* ---- 打印:两页 A4 宣传单 ----
   第 1 页:首屏 + 项目介绍;第 2 页:能做什么 + 关于 + 一起做 + 留联系方式。 */
@media print {
  @page { size: A4; margin: 0; }
  html, body { background: #fff; font-size: 9pt; line-height: 1.45; }
  * { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .top, .no-print{ display: none !important; }
  .wrap { width: auto; margin: 0 12mm; }
  section { padding: 6mm 0; }
  h2 { font-size: 17pt; margin: 1.5mm 0 0; }
  h2 small { font-size: 8pt; margin-top: 1mm; }
  .kicker { font-size: 7pt; }
  p { margin-bottom: .6em; }

  .hero { padding: 9mm 0 7mm; }
  .hero-grid { grid-template-columns: 1.05fr .95fr; gap: 6mm; }
  .hero h1 { font-size: 40pt; margin-top: 3mm !important; }
  .hero .sub { font-size: 14pt; margin-top: 3mm; }
  .hero .sub-en { font-size: 8pt; }
  .hero .lead { margin: 5mm 0 1mm; font-size: 15pt; }
  .hero .lead-en { margin-bottom: 3mm; }
  .points { gap: 1.5mm; margin-bottom: 2mm; }
  .points li i { width: 5mm; height: 5mm; font-size: 7pt; border-radius: 1.5mm; }
  .points-en { font-size: 8pt; margin-bottom: 0; }
  .hero-art svg { max-height: 78mm; margin-left: auto; }

  #system { padding-top: 6mm !important; }
  .two { grid-template-columns: 1fr 1fr; gap: 7mm; margin-top: 3mm; }
  .two p { font-size: 8.6pt; }
  .en { font-size: 8pt; }
  .flow { margin-top: 3mm; grid-template-columns: repeat(5, 1fr); border-radius: 3mm; break-inside: avoid; }
  .flow li { padding: 2.5mm 3mm; border-bottom: 0; }
  .flow li:last-child { grid-column: auto; }
  .flow li::before { margin-bottom: 1mm; font-size: 7pt; }
  .flow b { font-size: 9pt; }
  .flow span { font-size: 7.5pt; }

  .team { break-before: page; padding: 9mm 0 7mm; }

  #together .two { margin-top: 2mm !important; }
  .partners { grid-template-columns: 1fr 1fr; gap: 3mm; margin-top: 3mm; }
  .partner { padding: 3mm 3.5mm; grid-template-columns: 9mm 1fr; gap: 3mm; border-radius: 3mm; break-inside: avoid; }
  .partner .ico { width: 9mm; height: 9mm; border-radius: 2mm; }
  .partner .ico svg { width: 5mm; height: 5mm; }
  .partner h3 { font-size: 10pt; }
  .partner h3 small { font-size: 7pt; margin: .5mm 0 1.5mm; }
  footer { padding: 3mm 0; font-size: 7pt; }
}

/* ---- 能做什么(用例卡) ---- */
.uses { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.uses > * { min-width: 0; }
.use { margin: 0; background: var(--card); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.use .pic { aspect-ratio: 16 / 10; background: #EFEFEA; }
.use .pic svg { width: 100%; height: 100%; }
.use figcaption { padding: 16px 18px 18px; }
.use b { display: block; font-size: 17px; }
.use span { display: block; font: 500 12px var(--mono); color: var(--text-2); margin: 2px 0 8px; }
.use p { margin: 0; font-size: 14px; color: var(--text-2); }

/* ---- 在线体验入口 ---- */
.demo-card { display: grid; grid-template-columns: 1fr 1fr; gap: 0; background: var(--card); border: 1px solid var(--line); border-radius: 20px; overflow: hidden; }
.demo-card > * { min-width: 0; }
.demo-pic svg { width: 100%; height: 100%; object-fit: cover; }
.demo-text { padding: 36px 40px; align-self: center; }
.demo-text .btn { margin-top: 8px; }
@media (max-width: 960px) { .demo-card { grid-template-columns: 1fr; } .demo-text { padding: 24px; } }

/* ---- 关于 ---- */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-top: 24px; }
.about > * { min-width: 0; }

/* ---- 合作对象(点一下 = 跳到报名区) ---- */
a.partner { text-decoration: none; font: inherit; color: inherit; text-align: left; cursor: pointer; width: 100%; transition: border-color .15s, box-shadow .15s; }
a.partner:hover { border-color: var(--teal); }

.join { padding: 96px 0; }
.join-grid { display: grid; grid-template-columns: .85fr 1.15fr; gap: 48px; align-items: start; }
.join-grid > * { min-width: 0; }
.join h2 { font-size: clamp(30px, 4vw, 48px); }
.join .en-big { font: 600 clamp(16px, 1.8vw, 20px) var(--font); color: var(--lime); margin: 6px 0 22px; }
.join-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; color: #C9CCD2; font-size: 15px; }
.join-list li { display: flex; gap: 10px; }
.join-list li::before { content: "✓"; color: var(--lime); font-weight: 800; }

@media (max-width: 960px) {
  .uses, .about, .join-grid { grid-template-columns: 1fr; }
}
@media print {
   .join-list { display: none !important; }
  .join { padding: 8mm 0; break-inside: avoid; }
  .join-grid { display: block; text-align: center; }
  .join h2 { font-size: 20pt; }
  .join .en-big { font-size: 10pt; margin-bottom: 2mm; }
  .print-only { display: block !important; }
  .uses { grid-template-columns: repeat(3, 1fr); gap: 4mm; }
  .use { border-radius: 3mm; break-inside: avoid; }
  .use figcaption { padding: 2mm 3mm; }
  .use b { font-size: 9pt; }
  .use span { font-size: 7pt; margin: .5mm 0 1mm; }
  .use p { font-size: 7.5pt; }
  .about { grid-template-columns: 1fr 1fr; gap: 7mm; margin-top: 3mm; }
  a.partner { box-shadow: none !important; }
  footer { display: none !important; }
  #uses { break-before: page; padding-top: 9mm !important; }
  #about.team { break-before: auto; padding: 6mm 0; }
  .use .pic { aspect-ratio: 16 / 8; }
}
.print-only { display: none; }

/* ---- 报名(跳到 Wix 报名页) ---- */
.signup { background: var(--card); color: var(--text); border-radius: 18px; padding: 32px; display: grid; gap: 12px; align-content: start; }
.signup h3 { font-size: 24px; }
.signup h3 small { display: block; font: 500 13px var(--mono); color: var(--text-2); margin-top: 4px; }
.signup p { margin: 0; }
.signup .btn { justify-self: start; margin-top: 8px; }
.signup .btn.is-disabled { background: #E3E3DE; color: var(--text-2); cursor: default; }
.signup-note { font-size: 13px; color: var(--text-2); }
@media print { .signup { display: none !important; } }