:root {
  color-scheme: light;
  --bg: #f6f8fa; --card: #ffffff; --border: #e4e7ed; --border-lt: #ebeef5;
  --text-1: #24292f; --text-2: #57606a; --text-3: #8b949e;
  --primary: #2e7cd6; --primary-deep: #1e5fa8; --primary-weak: #ecf5ff; --primary-line: #d9ecff;
  --success: #2f9e44; --success-weak: #ebfbee; --success-line: #d3f0dc;
  --warning: #c47f17; --warning-weak: #fdf6ec; --warning-line: #faecd8;
  --danger: #d64545; --danger-weak: #fef0f0; --danger-line: #fde2e2;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: var(--font); font-size: 15px; line-height: 1.7; color: var(--text-1); background: var(--bg); }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
[hidden] { display: none !important; }
.mono { font-family: var(--mono); font-size: .92em; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; } html { scroll-behavior: auto; } }

.topbar { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.94); backdrop-filter: blur(6px); border-bottom: 1px solid var(--border-lt); }
.topbar-in { max-width: 1060px; margin: 0 auto; display: flex; align-items: center; gap: 20px; height: 56px; padding: 0 max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 16px; color: var(--text-1); text-decoration: none; }
.brand svg { width: 24px; height: 24px; color: var(--primary); }
.brand small { font-weight: 400; font-size: 11px; color: var(--text-3); display: block; line-height: 1.1; letter-spacing: .5px; }
.nav { margin-left: auto; display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.nav a { color: var(--text-2); text-decoration: none; font-size: 14px; padding: 6px 10px; border-radius: 6px; }
.nav a:hover { color: var(--primary); background: var(--primary-weak); }
.nav a.ghost { border: 1px solid var(--border); font-size: 12px; color: var(--text-3); }
.nav a.ghost:hover { color: var(--primary); border-color: var(--primary-line); }

.wrap { max-width: 1060px; margin: 0 auto; padding: 0 max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }

.hero { padding: 52px 0 30px; }
.hero h1 { font-size: clamp(26px, 4.5vw, 38px); line-height: 1.25; margin: 0 0 12px; letter-spacing: .3px; text-wrap: balance; }
.hero h1 b { color: var(--primary); }
.hero p { max-width: 640px; color: var(--text-2); margin: 0 0 22px; }
.hero-acts { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 20px; border-radius: 6px; font-size: 15px; font-family: var(--font); cursor: pointer; text-decoration: none; border: 1px solid var(--border); background: var(--card); color: var(--text-1); }
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-deep); border-color: var(--primary-deep); color: #fff; }
.btn-sm { height: 34px; padding: 0 14px; font-size: 13px; }

.pledges { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; padding: 10px 0 8px; }
.pl { background: var(--card); border: 1px solid var(--border-lt); border-radius: 8px; padding: 16px 18px; }
.pl svg { width: 22px; height: 22px; color: var(--primary); }
.pl h3 { font-size: 15px; margin: 8px 0 4px; }
.pl p { font-size: 13px; color: var(--text-2); margin: 0; line-height: 1.65; }

.sect { padding: 26px 0 10px; }
.sect > h2 { font-size: 22px; margin: 0 0 6px; text-wrap: balance; }
.sect > .sub { color: var(--text-2); margin: 0 0 18px; font-size: 14px; }

.card { background: var(--card); border: 1px solid var(--border-lt); border-radius: 10px; box-shadow: 0 1px 3px rgba(9, 30, 66, .05); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 18px; padding: 22px; }
.f-col { display: flex; flex-direction: column; gap: 7px; }
.f-col.full { grid-column: 1 / -1; }
.f-col label { font-size: 13.5px; font-weight: 600; color: var(--text-1); }
.f-col label b { color: var(--danger); font-weight: 400; }
.f-col .tip { font-size: 12px; color: var(--text-3); }
.ipt { height: 42px; border: 1px solid var(--border); border-radius: 6px; padding: 0 12px; font-size: 14px; font-family: var(--font); color: var(--text-1); background: #fbfcfd; width: 100%; }
.ipt:focus, .ta:focus { outline: none; border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(46, 124, 214, .12); }
select.ipt { cursor: pointer; }
.ta { width: 100%; min-height: 110px; border: 1px solid var(--border); border-radius: 6px; padding: 10px 12px; font: 14px/1.7 var(--font); color: var(--text-1); background: #fbfcfd; resize: vertical; }
.err { font-size: 12px; color: var(--danger); min-height: 18px; }
.drop { border: 1.5px dashed var(--border); border-radius: 8px; padding: 14px; text-align: center; font-size: 13px; color: var(--text-2); cursor: pointer; background: #fbfcfd; }
.drop:hover { border-color: var(--primary); color: var(--primary); }
.drop b { color: var(--primary); }
.agree { display: flex; gap: 8px; align-items: flex-start; font-size: 13px; color: var(--text-2); }
.agree input { margin-top: 3px; accent-color: var(--primary); width: 15px; height: 15px; }
.form-foot { grid-column: 1 / -1; display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }

.done { padding: 30px 26px; text-align: center; }
.done .ok { width: 56px; height: 56px; margin: 0 auto 14px; border-radius: 50%; background: var(--success-weak); color: var(--success); display: flex; align-items: center; justify-content: center; }
.done .ok svg { width: 28px; height: 28px; }
.done h3 { margin: 0 0 6px; font-size: 19px; }
.done p { color: var(--text-2); font-size: 14px; margin: 0 auto 16px; max-width: 460px; }
.tk-box { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 18px; }
.tk { background: #f7f9fc; border: 1px solid var(--border-lt); border-radius: 8px; padding: 10px 18px; text-align: center; }
.tk .lb { font-size: 12px; color: var(--text-3); }
.tk .val { font-size: 17px; font-weight: 700; font-family: var(--mono); letter-spacing: .5px; }
.tk .val.code { color: var(--primary); letter-spacing: 3px; }

.track-grid { display: grid; grid-template-columns: 340px 1fr; gap: 18px; align-items: start; padding: 4px 0 10px; }
.track-form { padding: 22px; display: flex; flex-direction: column; gap: 14px; }
.result { padding: 22px 24px; }
.st-badge { display: inline-flex; align-items: center; gap: 7px; height: 26px; padding: 0 11px; border-radius: 13px; font-size: 13px; font-weight: 600; }
.st-badge.run { background: var(--primary-weak); color: var(--primary); }
.st-badge.done { background: var(--success-weak); color: var(--success); }
.tl { list-style: none; margin: 16px 0 0; padding: 0; }
.tl li { position: relative; padding: 0 0 18px 24px; }
.tl li::before { content: ""; position: absolute; left: 6px; top: 16px; bottom: -2px; width: 1.5px; background: var(--border-lt); }
.tl li:last-child::before { display: none; }
.tl .dot { position: absolute; left: 0; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--text-3); border: 2.5px solid #fff; box-shadow: 0 0 0 1.5px var(--border); }
.tl .dot.ok { background: var(--success); box-shadow: 0 0 0 1.5px var(--success-line); }
.tl .dot.cur { background: var(--primary); box-shadow: 0 0 0 1.5px var(--primary-line); }
.tl .t { font-size: 12px; color: var(--text-3); }
.tl .h { font-size: 14.5px; font-weight: 600; margin: 1px 0 2px; }
.tl .d { font-size: 13px; color: var(--text-2); line-height: 1.6; }
.empty { text-align: center; color: var(--text-3); font-size: 14px; padding: 34px 10px; }

.sla-tbl { width: 100%; border-collapse: collapse; font-size: 14px; background: var(--card); }
.sla-tbl th, .sla-tbl td { padding: 11px 16px; border-bottom: 1px solid var(--border-lt); text-align: left; }
.sla-tbl th { background: #f8f9fb; color: var(--text-2); font-size: 13px; }
.sla-tbl tr:last-child td { border-bottom: 0; }
.sla-tbl td.num { font-variant-numeric: tabular-nums; }

.aup { padding: 22px 24px; }
.aup ol { margin: 0; padding-left: 20px; color: var(--text-2); font-size: 14px; }
.aup li { margin-bottom: 9px; }
.aup li b { color: var(--text-1); }

.contact { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.mail-chip { display: inline-flex; align-items: center; gap: 10px; background: #f7f9fc; border: 1px solid var(--border-lt); border-radius: 8px; padding: 10px 14px; }
.mail-chip .mono { font-size: 14.5px; }
.copy { height: 30px; padding: 0 10px; font-size: 12px; border: 1px solid var(--border); border-radius: 6px; background: #fff; cursor: pointer; color: var(--text-2); font-family: var(--font); }
.copy:hover { color: var(--primary); border-color: var(--primary-line); }

footer { margin-top: 40px; border-top: 1px solid var(--border-lt); padding: 22px 0 30px; color: var(--text-3); font-size: 13px; }
.foot-in { max-width: 1060px; margin: 0 auto; padding: 0 max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); display: flex; gap: 16px; flex-wrap: wrap; align-items: center; }
.foot-in a { color: var(--text-3); text-decoration: none; margin-left: auto; }
.foot-in a:hover { color: var(--primary); }

.toast { position: fixed; bottom: 24px; left: 50%; transform: translate(-50%, 8px); background: #24292f; color: #fff; padding: 10px 18px; border-radius: 8px; font-size: 13.5px; z-index: 99; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; max-width: calc(100vw - 32px); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 860px) {
  .form-grid { grid-template-columns: 1fr; padding: 16px; }
  .track-grid { grid-template-columns: 1fr; }
  .nav a { padding: 6px 7px; font-size: 13px; }
  .hero { padding-top: 34px; }
}

/* 时间线附件 : 缩略图 / 文件下载 / 灯箱 */
.tl-atts { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.tl-thumb { width: 92px; height: 68px; object-fit: cover; border: 1px solid var(--border); border-radius: 4px; cursor: zoom-in; background: #fff; }
.tl-thumb:hover { border-color: var(--primary); }
.tl-file { font-size: 13px; color: var(--primary); text-decoration: none; padding: 6px 10px; border: 1px solid var(--border); border-radius: 4px; background: var(--card); }
.tl-file:hover { border-color: var(--primary); }
#trViewer { position: fixed; inset: 0; z-index: 999; background: rgba(8, 10, 14, .82); display: none; align-items: center; justify-content: center; cursor: zoom-out; }
#trViewer.show { display: flex; }
#trViewer img { max-width: 92vw; max-height: 92vh; border-radius: 6px; box-shadow: 0 12px 48px rgba(0, 0, 0, .5); }