/* BanShow Tools — single stylesheet for every page. */

:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #f1f3f7;
  --text: #1b1e24;
  --muted: #626b7a;
  --border: #dde1e8;
  --accent: #2f6bff;
  --accent-soft: #e8efff;
  --accent-text: #ffffff;
  --ok: #157a4a;
  --err: #c0392b;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 6px 20px rgba(16, 24, 40, 0.05);
  --checker: repeating-conic-gradient(#e8eaee 0% 25%, #f7f8fa 0% 50%) 50% / 18px 18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1c1f25;
    --surface-2: #23272f;
    --text: #e9ecf1;
    --muted: #9aa3b2;
    --border: #303641;
    --accent: #5c8bff;
    --accent-soft: #1e2a45;
    --ok: #4cc38a;
    --err: #ff7b6b;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
    --checker: repeating-conic-gradient(#262a31 0% 25%, #1c1f25 0% 50%) 50% / 18px 18px;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
.hidden { display: none !important; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
}

img, svg, video { max-width: 100%; }

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

h1, h2, h3 { line-height: 1.25; margin: 0 0 0.5em; letter-spacing: -0.01em; }
h1 { font-size: clamp(1.7rem, 1.2rem + 2vw, 2.4rem); }
h2 { font-size: clamp(1.3rem, 1.05rem + 1vw, 1.6rem); margin-top: 2em; }
h3 { font-size: 1.05rem; }
p { margin: 0 0 1em; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 780px; }
.center { text-align: center; }

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--accent); color: var(--accent-text);
  padding: 10px 16px; border-radius: 0 0 8px 0; z-index: 50;
}
.skip:focus { left: 0; }

/* ---------- header / footer ---------- */

.site-head {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--border);
}
.head-in { display: flex; align-items: center; gap: 18px; min-height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 1.3rem; line-height: 1; }
.brand-name { display: flex; flex-direction: column; font-size: 1rem; }
.brand-name small { font-size: 0.7rem; font-weight: 500; color: var(--muted); letter-spacing: 0.02em; }
.nav { display: flex; gap: 18px; margin-left: auto; }
.nav a { color: var(--muted); font-size: 0.95rem; }
.nav a:hover { color: var(--text); }
.lang { display: flex; gap: 4px; border: 1px solid var(--border); border-radius: 999px; padding: 3px; }
.lang a { padding: 3px 10px; border-radius: 999px; font-size: 0.82rem; color: var(--muted); }
.lang a.on { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.lang a:hover { text-decoration: none; }

.site-foot { margin-top: 72px; border-top: 1px solid var(--border); background: var(--surface); }
.foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 28px; padding: 36px 20px 8px; }
.foot-brand { font-weight: 700; margin-bottom: 6px; }
.foot-tag, .foot-mail { color: var(--muted); font-size: 0.9rem; margin: 0 0 6px; }
.foot-h { font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.foot-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: 0.92rem; }
.copy { color: var(--muted); font-size: 0.82rem; padding: 18px 20px 26px; margin: 0; }

/* ---------- hero / cards ---------- */

.hero { padding: 56px 20px 8px; }
.hero .lede { font-size: 1.12rem; color: var(--muted); max-width: 60ch; }
.hero-cta { margin-top: 22px; }

.cat-h { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); margin: 28px 0 12px; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.grid.wide { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }

.card {
  display: flex; flex-direction: column; gap: 6px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; color: var(--text); box-shadow: var(--shadow);
  transition: transform 0.12s ease, border-color 0.12s ease;
}
.card:hover { text-decoration: none; transform: translateY(-2px); border-color: var(--accent); }
.card-icon { font-size: 1.4rem; line-height: 1; }
.card-name { font-weight: 650; }
.card-desc { color: var(--muted); font-size: 0.9rem; }

.why-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.why-card h3 { margin-bottom: 6px; }
.why-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

/* ---------- buttons / forms ---------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font: inherit; font-weight: 600; font-size: 0.95rem;
  padding: 10px 18px; border-radius: 9px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, opacity 0.12s ease;
}
.btn:hover { border-color: var(--accent); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btn.primary:hover { opacity: 0.9; }
.btn.ghost { background: transparent; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

.tool { display: grid; gap: 16px; }

.drop {
  border: 2px dashed var(--border); border-radius: var(--radius);
  background: var(--surface); padding: 44px 24px; text-align: center; cursor: pointer;
  transition: border-color 0.12s ease, background 0.12s ease;
}
.drop:hover, .drop:focus-visible, .drop.over { border-color: var(--accent); background: var(--accent-soft); outline: none; }
.drop-icon { font-size: 1.8rem; color: var(--accent); }
.drop-title { font-weight: 650; margin: 8px 0 2px; }
.drop-sub { color: var(--muted); margin: 0 0 10px; }
.drop-formats { font-size: 0.8rem; color: var(--muted); letter-spacing: 0.03em; margin: 0 0 12px; }
.drop-privacy { font-size: 0.82rem; color: var(--ok); margin: 0; }

.status { color: var(--muted); font-size: 0.92rem; margin: 0; }
.status.err { color: var(--err); }

.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); display: grid; gap: 16px; }

.orig { font-size: 0.86rem; color: var(--muted); background: var(--surface-2); border-radius: 8px; padding: 9px 12px; word-break: break-all; }
.orig:empty { display: none; }

.opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.field-label { font-size: 0.82rem; font-weight: 600; color: var(--muted); }
.field-hint { font-size: 0.75rem; color: var(--muted); }
.field-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-items: end; }

input[type="number"], input[type="text"], select {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; padding: 9px 11px; width: 100%;
}
input[type="range"] { width: 100%; accent-color: var(--accent); }
input[type="color"] { width: 100%; height: 40px; padding: 3px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
output { font-size: 0.85rem; color: var(--muted); }
select:focus-visible, input:focus-visible, .btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }

.check { display: flex; align-items: center; gap: 8px; font-size: 0.92rem; }
.check input { accent-color: var(--accent); width: 16px; height: 16px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font: inherit; font-size: 0.85rem; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--surface); color: var(--muted); cursor: pointer;
}
.chip:hover { border-color: var(--accent); color: var(--text); }
.chip.on { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); font-weight: 600; }

.hint { font-size: 0.85rem; color: var(--muted); margin: 0; }
.note { font-size: 0.88rem; color: var(--ok); margin: 0; }
.note.err { color: var(--err); }

.run-row { display: flex; gap: 10px; flex-wrap: wrap; }

.progress { height: 8px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.progress .bar { height: 100%; width: 0; background: var(--accent); border-radius: 999px; transition: width 0.15s ease; }

.subpanel { border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; display: grid; gap: 12px; }
.subpanel > h3 { margin: 0; }
details.subpanel > summary { cursor: pointer; font-weight: 650; }

.fields { display: grid; gap: 12px; }
.fields .field-label { color: var(--text); }
.fields .field-type { font-size: 0.75rem; color: var(--muted); font-weight: 500; }

/* ---------- result ---------- */

.result { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow); }
.result-grid { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 22px; }
.preview {
  background: var(--checker); border: 1px solid var(--border); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; min-height: 180px; overflow: hidden;
}
.preview img { display: block; max-height: 440px; max-width: 100%; object-fit: contain; }
.pdfframe { width: 100%; height: 440px; border: 0; display: block; background: #fff; }
.result-side h3 { margin: 0 0 10px; }
.stats { display: grid; grid-template-columns: auto 1fr; gap: 6px 14px; margin: 0 0 18px; font-size: 0.9rem; }
.stats dt { color: var(--muted); }
.stats dd { margin: 0; font-variant-numeric: tabular-nums; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- prose ---------- */

.prose-block { margin-top: 40px; }
.crumb { font-size: 0.85rem; color: var(--muted); padding-top: 22px; }
.crumb a { color: var(--muted); }
.crumb a:hover { color: var(--accent); }
.tool-head { padding-top: 14px; }
.tool-head .lede { color: var(--muted); font-size: 1.05rem; max-width: 68ch; }
.tool-shell { margin-top: 18px; }

.steps { padding-left: 1.3em; display: grid; gap: 8px; }
.steps li::marker { color: var(--accent); font-weight: 700; }

.faq { display: grid; gap: 8px; }
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq summary::marker { color: var(--accent); }
.faq details p { margin: 10px 0 2px; color: var(--muted); }

.guide-teaser { margin-top: 40px; background: var(--accent-soft); border-radius: var(--radius); padding: 18px 20px; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.guide-teaser p { margin: 0; color: var(--text); }

.article { line-height: 1.75; }
.article h2 { margin-top: 1.8em; }
.article ul { padding-left: 1.2em; display: grid; gap: 6px; }
.article li::marker { color: var(--accent); }
.article .lede { color: var(--muted); font-size: 1.08rem; }

.cta-box { margin-top: 44px; border-left: 3px solid var(--accent); background: var(--surface); border-radius: 0 var(--radius) var(--radius) 0; padding: 18px 20px; }
.cta-box p { color: var(--muted); }

.big404 { font-size: clamp(4rem, 12vw, 7rem); margin: 40px 0 0; color: var(--accent); letter-spacing: -0.04em; }

/* ---------- responsive ---------- */

@media (max-width: 820px) {
  .result-grid { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .nav { gap: 12px; }
}

@media (max-width: 560px) {
  .head-in { flex-wrap: wrap; min-height: 0; padding: 10px 20px; gap: 10px; }
  .nav { order: 3; width: 100%; margin-left: 0; }
  .lang { margin-left: auto; }
  .foot-grid { grid-template-columns: 1fr; }
  .field-pair { grid-template-columns: 1fr; }
  .drop { padding: 30px 16px; }
}