/* ==========================================================================
   GOVORDER — 对外英文站
   --------------------------------------------------------------------------
   设计语言：政府采购档案感。受众是美国州/市县/学区/公用事业的采购员，
   他们要的是「能不能做、多少钱、多久到」，不是营销词。

   · 衬线标题(Spectral) + 无衬线正文(IBM Plex Sans) + 等宽数据(IBM Plex Mono)
     —— 读起来像一份记录，不像一个 SaaS 落地页
   · 只有一个强调色（鲸鱼绿 #0F5D4F，和 GOVBUY 主站同源）
   · 框只给「交互」和「数据表」，其余用发丝线 + 留白
   · 主推的「已交付清单」用账本式表格 —— 这是竞争对手伪造不了的东西

   ⚠ 三态主题必须写全：裸 :root / prefers-color-scheme / [data-theme]
     颜色只定义在 media 块里 = 系统默认态失效。
   ========================================================================== */

:root {
  --paper:      #F5F7F4;
  --surface:    #FFFFFF;
  --surface-2:  #EDF1EE;
  --ink:        #15211D;
  --ink-2:      #46574F;
  --ink-3:      #74867E;
  --rule:       #DCE4DF;
  --rule-soft:  #E9EFEB;
  --accent:     #0F5D4F;
  --accent-2:   #0B4A3E;
  --on-accent:  #FFFFFF;
  --dark-bg:    #0E2A24;
  --shadow:     0 1px 2px rgba(21,33,29,.05), 0 10px 30px rgba(21,33,29,.05);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper:     #0D1613;
    --surface:   #14211D;
    --surface-2: #1B2A25;
    --ink:       #E7EEEA;
    --ink-2:     #B2C2BB;
    --ink-3:     #85988F;
    --rule:      #26362F;
    --rule-soft: #1F2E28;
    --accent:    #5FBFA6;
    --accent-2:  #7FD3BC;
    --on-accent: #08201B;
    --dark-bg:   #18332C;
    --shadow:    0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.25);
  }
}

:root[data-theme="dark"] {
  --paper:     #0D1613;
  --surface:   #14211D;
  --surface-2: #1B2A25;
  --ink:       #E7EEEA;
  --ink-2:     #B2C2BB;
  --ink-3:     #85988F;
  --rule:      #26362F;
  --rule-soft: #1F2E28;
  --accent:    #5FBFA6;
  --accent-2:  #7FD3BC;
  --on-accent: #08201B;
  --dark-bg:   #18332C;
  --shadow:    0 1px 2px rgba(0,0,0,.3), 0 10px 30px rgba(0,0,0,.25);
}

* { box-sizing: border-box; }

/* ⚠ hidden 属性来自浏览器默认样式表，**任何作者样式里的 display 都会盖掉它**
   （作者样式优先级永远高于 UA 样式，与选择器权重无关）。
   .btn/.filelist/.readrow/.pager 都显式写了 display，于是 hidden 全部失效 ——
   表现就是「未登录也显示 Sign out」「没传文件就显示 Read files 按钮」。
   这条兜底必须有。 */
[hidden] { display: none !important; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16.5px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: Spectral, Georgia, "Times New Roman", serif;
  font-weight: 700;
  letter-spacing: -.012em;
  text-wrap: balance;
  margin: 0;
}

a { color: var(--accent); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 28px; }

.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;
}

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--accent); color: var(--on-accent); padding: 12px 20px;
}
.skip:focus { left: 0; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 3px; }

/* ── 顶栏 ───────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--rule-soft);
}
.nav-in { display: flex; align-items: center; gap: 28px; height: 68px; }

.brand { display: inline-flex; align-items: center; text-decoration: none; line-height: 0; }

/* 标识用 background-image 而不是 <picture>：
   ⚠ <picture> 的 media 查询只认操作系统的 prefers-color-scheme，
     认不了 CSS 里的 [data-theme]。浅色模式下会拿到深色版, 浅绿落浅底几乎隐形。
     改成 CSS 控制后，和全站其他颜色走同一套三态主题规则。
   ⚠ SVG 里的字已转成轮廓路径 —— 外链 SVG 加载不到页面字体，用活字必然回退成别的字形。 */
.brand-logo {
  display: block; width: 128px; height: 30px;
  background: url("/brand/lockup-sm-light.svg") left center / contain no-repeat;
}
.brand-foot .brand-logo { width: 145px; height: 34px; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .brand-logo {
    background-image: url("/brand/lockup-sm-dark.svg");
  }
}
:root[data-theme="dark"] .brand-logo {
  background-image: url("/brand/lockup-sm-dark.svg");
}

.nav-links { display: flex; gap: 26px; margin-left: auto; }
.nav-links a {
  font-size: 14.5px; font-weight: 500; color: var(--ink-2); text-decoration: none;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--accent); }

/* ── 按钮 ───────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 26px; border: 1px solid transparent; border-radius: 8px;
  background: var(--accent); color: var(--on-accent);
  font: 600 15px/1 "IBM Plex Sans", sans-serif;
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: background .16s ease, border-color .16s ease, opacity .16s ease;
}
.btn:hover { background: var(--accent-2); }
.btn-sm { padding: 9px 17px; font-size: 14px; }
.btn-ghost { background: transparent; color: var(--accent); border-color: var(--rule); }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--accent); }
.btn-invert { background: #fff; color: #0E2A24; }
.btn-invert:hover { background: #DCEDE7; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

.actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 30px; }

/* ── 通用排版件 ─────────────────────────────────────────── */
.eyebrow {
  margin: 0 0 15px;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12px; font-weight: 500; letter-spacing: .17em;
  text-transform: uppercase; color: var(--accent);
}

.lead {
  max-width: 44em; margin: 0 0 18px;
  font-size: 18px; line-height: 1.82; color: var(--ink-2);
}
.lead-tight { margin-bottom: 0; }
.lead strong { color: var(--ink); font-weight: 600; }

.sec { padding: 78px 0; border-top: 1px solid var(--rule-soft); }
.sec-alt { background: var(--surface); }
.sec-head { margin-bottom: 42px; }
.sec-head h2 { font-size: clamp(27px, 3.3vw, 38px); line-height: 1.24; margin-bottom: 16px; }
.sec-sub { max-width: 50em; margin: 0 0 14px; font-size: 16.5px; line-height: 1.8; color: var(--ink-2); }
.sec-sub strong { color: var(--ink); font-weight: 600; }

/* ── Hero ───────────────────────────────────────────────── */
.hero { padding: 84px 0 66px; }
.hero h1 {
  font-size: clamp(33px, 5vw, 58px);
  line-height: 1.16; margin-bottom: 28px; letter-spacing: -.022em;
}

/* ── 数字条 ─────────────────────────────────────────────── */
.stats {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--rule); margin-bottom: 4px;
}
.stat { padding: 26px 22px 28px 0; border-bottom: 1px solid var(--rule-soft); }
.stat + .stat { padding-left: 26px; border-left: 1px solid var(--rule-soft); }
.stat-n {
  font-family: "IBM Plex Mono", monospace;
  font-size: 40px; font-weight: 500; line-height: 1;
  color: var(--accent); font-variant-numeric: tabular-nums; letter-spacing: -.02em;
}
.stat-u { font-size: 21px; margin-left: 2px; }
.stat-l { margin-top: 12px; font-size: 15px; font-weight: 600; color: var(--ink); }
.stat-note { margin-top: 5px; font-size: 13px; line-height: 1.6; color: var(--ink-3); }

/* ── 账本表格：已交付清单 ───────────────────────────────── */
.ledger-wrap { overflow-x: auto; border: 1px solid var(--rule); border-radius: 12px; background: var(--surface); }
.ledger { width: 100%; min-width: 720px; border-collapse: collapse; font-size: 15px; }
.ledger thead th {
  background: var(--surface-2); color: var(--ink-2);
  font-family: "IBM Plex Mono", monospace;
  font-size: 11.5px; font-weight: 500; letter-spacing: .12em; text-transform: uppercase;
  text-align: left; padding: 13px 18px; border-bottom: 1px solid var(--rule);
}
.ledger tbody td { padding: 13px 18px; border-bottom: 1px solid var(--rule-soft); vertical-align: top; }
.ledger tbody tr:last-child td { border-bottom: 0; }
.ledger tbody tr:hover { background: var(--surface-2); }
.ledger .num {
  font-family: "IBM Plex Mono", monospace; font-variant-numeric: tabular-nums;
  text-align: right; white-space: nowrap; color: var(--ink-2);
}
.ledger td:last-child { color: var(--ink-2); white-space: nowrap; }

.foot-note { margin: 14px 0 0; font-size: 13.5px; color: var(--ink-3); }

/* ── 品类 / 供应商 四格 ─────────────────────────────────── */
.cat-grid {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0; margin-top: 46px; border-top: 1px solid var(--rule);
}
.cat { padding: 24px 24px 26px 0; border-bottom: 1px solid var(--rule-soft); }
.cat + .cat { padding-left: 26px; border-left: 1px solid var(--rule-soft); }
.cat h3 { font-size: 17px; margin-bottom: 9px; }
.cat p { margin: 0; font-size: 14.5px; line-height: 1.75; color: var(--ink-2); }

/* ── 步骤 ───────────────────────────────────────────────── */
.steps { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.step {
  display: grid; grid-template-columns: 62px 1fr; gap: 24px;
  padding: 26px 0; border-bottom: 1px solid var(--rule-soft);
}
.step-n {
  font-family: "IBM Plex Mono", monospace; font-size: 26px; font-weight: 500;
  line-height: 1.1; color: var(--accent); opacity: .42;
}
.step h3 { font-size: 20px; margin-bottom: 8px; }
.step p { margin: 0; max-width: 56em; font-size: 15.5px; line-height: 1.82; color: var(--ink-2); }
.step strong { color: var(--ink); font-weight: 600; }

/* ── 买家分段 ───────────────────────────────────────────── */
.who-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0; border-top: 1px solid var(--rule);
}
.who { padding: 28px 30px 30px 0; border-bottom: 1px solid var(--rule-soft); }
.who-grid > .who:nth-child(2n) { padding-left: 30px; border-left: 1px solid var(--rule-soft); }
.who h3 { font-size: 20px; margin-bottom: 11px; }
.who-ex {
  margin: 0 0 12px;
  font-family: "IBM Plex Mono", monospace; font-size: 12.5px; line-height: 1.85;
  color: var(--accent);
}
.who p:last-child { margin: 0; font-size: 15px; line-height: 1.78; color: var(--ink-2); }

/* ── 深色 RFQ 段 ────────────────────────────────────────── */
.sec-dark { background: var(--dark-bg); color: #E7EEEA; border-top: 0; }
.sec-dark .eyebrow { color: #7FD3BC; }
.sec-dark h2 { color: #FFFFFF; }
.sec-dark .sec-sub { color: rgba(231,238,234,.78); }
.sec-dark .sec-sub strong { color: #fff; }

/* ── 表单 ───────────────────────────────────────────────── */
.form { max-width: 880px; }
.row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.field { display: block; margin-bottom: 18px; }
.field > span {
  display: block; margin-bottom: 7px;
  font-size: 13.5px; font-weight: 600; color: rgba(231,238,234,.9);
}
.field > span em {
  font-style: normal; font-family: "IBM Plex Mono", monospace;
  font-size: 10.5px; letter-spacing: .1em; text-transform: uppercase;
  color: #7FD3BC; margin-left: 7px;
}
.field input, .field select, .field textarea {
  width: 100%; padding: 12px 14px;
  background: rgba(255,255,255,.055);
  border: 1px solid rgba(231,238,234,.2); border-radius: 8px;
  color: #E7EEEA;
  font: 400 15.5px/1.6 "IBM Plex Sans", sans-serif;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input::placeholder, .field textarea::placeholder { color: rgba(231,238,234,.4); }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: #7FD3BC; background: rgba(255,255,255,.09);
}
.field select option { background: #0E2A24; color: #E7EEEA; }
.field .invalid { border-color: #E0776A; }

.form-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 20px; margin-top: 10px; }
.form-note { flex: 1 1 320px; margin: 0; font-size: 13px; line-height: 1.7; color: rgba(231,238,234,.62); }
.form-msg { margin: 18px 0 0; font-size: 15px; font-weight: 500; min-height: 1.4em; }
.form-msg.ok  { color: #7FD3BC; }
.form-msg.err { color: #E0776A; }

/* ── About ──────────────────────────────────────────────── */
.about { display: grid; grid-template-columns: 1.6fr 1fr; gap: 54px; align-items: start; }
.about h2 { font-size: clamp(25px, 3vw, 34px); line-height: 1.26; margin-bottom: 18px; }
.about-side { padding-top: 6px; }
.meta { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 0; border-top: 1px solid var(--rule); }
.meta dt {
  padding: 11px 16px 11px 0; border-bottom: 1px solid var(--rule-soft);
  font-family: "IBM Plex Mono", monospace; font-size: 11.5px; letter-spacing: .11em;
  text-transform: uppercase; color: var(--ink-3); white-space: nowrap;
}
.meta dd {
  margin: 0; padding: 11px 0; border-bottom: 1px solid var(--rule-soft);
  font-size: 14.5px; color: var(--ink);
}

/* ── 页脚 ───────────────────────────────────────────────── */
.foot { border-top: 1px solid var(--rule); padding: 44px 0 52px; background: var(--surface); }
.foot-in { display: grid; grid-template-columns: 1.4fr 1fr; gap: 30px 44px; align-items: start; }

.foot-tag { margin: 8px 0 0; font-size: 14px; color: var(--ink-3); }
.foot-links { display: flex; flex-direction: column; gap: 9px; }
.foot-links a { font-size: 14px; color: var(--ink-2); text-decoration: none; }
.foot-links a:hover { color: var(--accent); }
.foot-legal {
  grid-column: 1 / -1; margin: 22px 0 0; padding-top: 20px;
  border-top: 1px solid var(--rule-soft);
  font-size: 13px; color: var(--ink-3);
}

/* ── 响应式 ─────────────────────────────────────────────── */
@media (max-width: 980px) {
  .nav-links { display: none; }
  .stats, .cat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat + .stat, .cat + .cat { padding-left: 0; border-left: 0; }
  .stats > .stat:nth-child(2n), .cat-grid > .cat:nth-child(2n) {
    padding-left: 24px; border-left: 1px solid var(--rule-soft);
  }
  .about { grid-template-columns: 1fr; gap: 34px; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .sec { padding: 56px 0; }
  .hero { padding: 54px 0 44px; }
  .stats, .cat-grid, .who-grid, .row, .foot-in { grid-template-columns: 1fr; }
  .stat, .cat, .who { padding-left: 0 !important; padding-right: 0; border-left: 0 !important; }
  .who-grid > .who:nth-child(2n) { padding-left: 0; border-left: 0; }
  .stat-n { font-size: 34px; }
  .step { grid-template-columns: 1fr; gap: 6px; }
  .step-n { font-size: 20px; }
  .foot-links { flex-direction: row; flex-wrap: wrap; gap: 8px 20px; }
}

/* ── 电话（2026-09-24 补）──────────────────────────────────
   政府采购员的第一反应常常是「打个电话问清楚」，所以顶栏、表单旁、
   页脚、About 四处都要有，不能只埋在页脚。等宽字体让号码好认好抄。 */
.nav-tel {
  font-family: "IBM Plex Mono", monospace;
  font-size: 13.5px; font-weight: 500; letter-spacing: .01em;
  color: var(--ink-2); text-decoration: none; white-space: nowrap;
}
.nav-tel:hover { color: var(--accent); }

.form-call { display: inline-block; margin-top: 7px; color: rgba(231,238,234,.78); }
.form-call a {
  font-family: "IBM Plex Mono", monospace; color: #7FD3BC;
  text-decoration: none; white-space: nowrap;
}
.form-call a:hover { text-decoration: underline; }

.foot-contact {
  margin: 12px 0 0; display: flex; flex-wrap: wrap; gap: 8px;
  font-family: "IBM Plex Mono", monospace; font-size: 13px;
}
.foot-contact a { color: var(--ink-2); text-decoration: none; }
.foot-contact a:hover { color: var(--accent); }
.foot-contact span { color: var(--ink-3); }

.meta dd a { color: var(--accent); text-decoration: none; }
.meta dd a:hover { text-decoration: underline; }

@media (max-width: 1100px) { .nav-tel { display: none; } }

/* ═══ 文件上传 + AI 读取（2026-09-25）═══════════════════════════════
   位置在 RFQ 表单最前面 —— 主路径是「传文件让 AI 读」，手填是备选。
   ⚠ 拖拽三个坑：dragover 必须 preventDefault；enter/leave 要计数，
     否则划过子元素就闪；遮罩必须 pointer-events:none 否则挡住 drop。 */
.drop {
  position: relative; margin-bottom: 20px; padding: 32px 26px;
  border: 1.5px dashed rgba(231,238,234,.3); border-radius: 14px;
  background: rgba(255,255,255,.035); text-align: center;
  transition: border-color .15s ease, background .15s ease;
}
.drop:hover { border-color: rgba(127,211,188,.55); background: rgba(255,255,255,.055); }
.drop.over  { border-color: #7FD3BC; background: rgba(127,211,188,.10); border-style: solid; }

.drop-in { position: relative; z-index: 1; }
.drop-ico { color: #7FD3BC; opacity: .85; margin-bottom: 10px; }
.drop-t { margin: 0 0 6px; font-size: 16.5px; font-weight: 600; color: #E7EEEA; }
.drop-d { margin: 0 0 18px; font-size: 13.5px; color: rgba(231,238,234,.6); }

.btn-ghost-lt {
  position: relative; overflow: hidden;
  background: transparent; color: #E7EEEA; border-color: rgba(231,238,234,.34);
}
.btn-ghost-lt:hover { background: rgba(255,255,255,.09); border-color: #7FD3BC; }
/* 真实 input 铺满按钮，opacity 0 —— 不要 label + hidden input */
.drop-btn input[type=file] {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0; cursor: pointer; font-size: 0;
}

.drop-over {
  position: absolute; inset: 0; display: none;
  align-items: center; justify-content: center;
  border-radius: 14px; background: rgba(14,42,36,.9);
  pointer-events: none;                     /* ⚠ 不加这条遮罩会吃掉 drop 事件 */
  font-size: 16px; font-weight: 600; color: #7FD3BC;
}
.drop.over .drop-over { display: flex; }

.filelist { list-style: none; margin: 0 0 18px; padding: 0; display: grid; gap: 8px; }
.filelist li {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 14px; border-radius: 9px;
  border: 1px solid rgba(231,238,234,.16); background: rgba(255,255,255,.04);
  font-size: 14px; color: #E7EEEA;
}
.filelist .fn { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.filelist .fs {
  font-family: "IBM Plex Mono", monospace; font-size: 12px;
  color: rgba(231,238,234,.55); white-space: nowrap; font-variant-numeric: tabular-nums;
}
.filelist .fx {
  font-family: "IBM Plex Mono", monospace; font-size: 10.5px; letter-spacing: .1em;
  text-transform: uppercase; padding: 3px 8px; border-radius: 99px; white-space: nowrap;
  border: 1px solid currentColor;
}
.filelist .fx.ok   { color: #7FD3BC; }
.filelist .fx.bad  { color: #E0776A; }
.filelist .fx.wait { color: rgba(231,238,234,.5); }

.readrow { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.readnote { font-size: 13.5px; color: rgba(231,238,234,.62); }

/* AI 结果说明框：必须显示 confidence 和 notes ——
   让人看得见判断链，而不是默默把字段填了就算 */
.aibox {
  margin-bottom: 22px; padding: 16px 20px; border-radius: 11px;
  border-left: 3px solid #7FD3BC; background: rgba(127,211,188,.09);
  font-size: 14.5px; line-height: 1.75; color: rgba(231,238,234,.9);
}
.aibox.low  { border-left-color: #D2A64E; background: rgba(210,166,78,.11); }
.aibox.fail { border-left-color: #E0776A; background: rgba(224,119,106,.11); }
.aibox b { color: #fff; font-weight: 600; }
.aibox ul { margin: 8px 0 0; padding-left: 20px; }
.aibox li { margin: 3px 0; font-size: 13.5px; color: rgba(231,238,234,.78); }
.field .prefilled { border-color: rgba(127,211,188,.55); background: rgba(127,211,188,.07); }