/* ==========================================================================
   帝王表 Diwangtu — Support & Privacy
   Design tokens mirror ImperialTheme.swift
   ========================================================================== */

:root {
  --ink:        #0e1c1f;
  --ink-soft:   #17282b;
  --silk:       #203336;
  --silk-light: #2d4446;
  --teal:       #317d82;
  --teal-soft:  #6bb8ba;
  --gold:       #eca442;
  --gold-soft:  #f1e8c2;
  --gold-deep:  #b76f3c;
  --cinnabar:   #b84717;
  --cinnabar-lit: #d45c1c;
  --paper:      #f5f0e0;
  --paper-dim:  #b3c2bd;
  --paper-faint:#7a8f8f;

  --radius: 18px;
  --maxw: 820px;

  --font-cn: "Kaiti SC", "STKaiti", "KaiTi", "Songti SC", serif;
  --font-serif: "Iowan Old Style", "Palatino", "Georgia", "Times New Roman", serif;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(circle at 100% 0%, rgba(184, 71, 23, .30), transparent 46%),
    radial-gradient(circle at 0% 100%, rgba(49, 125, 130, .20), transparent 46%),
    repeating-linear-gradient(0deg, rgba(107,184,186,.020) 0 1px, transparent 1px 3px),
    repeating-linear-gradient(90deg, rgba(107,184,186,.020) 0 1px, transparent 1px 3px);
  background-attachment: fixed;
  color: var(--paper);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: .01em;
}

/* --- language switching -------------------------------------------------- */
[data-lang] { display: none; }
html[lang^="zh"] [data-lang="zh"],
html[lang^="en"] [data-lang="en"] { display: block; }
html[lang^="zh"] span[data-lang="zh"],
html[lang^="en"] span[data-lang="en"] { display: inline; }

/* --- layout -------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 40px 22px 80px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 34px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand img {
  width: 54px;
  height: 54px;
  border-radius: 13px;
  border: 1px solid rgba(236, 164, 66, .38);
  box-shadow: 0 6px 20px rgba(0,0,0,.55);
  flex: none;
}

.brand-text { min-width: 0; }

.brand-name {
  font-size: 23px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--paper);
  line-height: 1.3;
  white-space: nowrap;
}

.brand-sub {
  font-family: var(--font-serif);
  font-size: 11.5px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold-soft);
  opacity: .72;
}

/* --- language toggle ----------------------------------------------------- */
.lang-switch {
  display: flex;
  flex: none;
  border: 1px solid rgba(236, 164, 66, .30);
  border-radius: 999px;
  overflow: hidden;
  background: rgba(32, 51, 54, .75);
}

.lang-switch button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--paper-dim);
  font-family: inherit;
  font-size: 13px;
  letter-spacing: .07em;
  padding: 7px 15px;
  cursor: pointer;
  transition: background .18s ease, color .18s ease;
}

.lang-switch button:hover { color: var(--paper); background: rgba(236,164,66,.10); }

.lang-switch button.is-active {
  background: linear-gradient(180deg, rgba(236,164,66,.30), rgba(183,111,60,.30));
  color: var(--gold-soft);
  font-weight: 700;
}

/* --- hero ---------------------------------------------------------------- */
.hero { margin-bottom: 40px; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .30em;
  text-transform: uppercase;
  color: rgba(241, 232, 194, .80);
  margin-bottom: 14px;
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--gold);
  flex: none;
}

h1 {
  font-size: 40px;
  line-height: 1.25;
  margin: 0 0 14px;
  font-weight: 700;
  letter-spacing: .02em;
  background: linear-gradient(100deg, var(--paper) 8%, var(--gold-soft) 52%, var(--gold) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p.lede {
  margin: 0;
  color: var(--paper-dim);
  font-size: 15.5px;
  max-width: 60ch;
}

.rule {
  height: 1px;
  border: 0;
  margin: 34px 0;
  background: linear-gradient(90deg,
      rgba(183,111,60,0), var(--gold), var(--gold-soft), var(--gold), rgba(183,111,60,0));
  opacity: .55;
}

/* --- cards --------------------------------------------------------------- */
.card {
  position: relative;
  background: linear-gradient(180deg, rgba(45,68,70,.65), rgba(23,40,43,.92));
  border: 1px solid rgba(236, 164, 66, .26);
  border-radius: var(--radius);
  padding: 24px 24px 22px;
  margin-bottom: 18px;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 46%;
  border-radius: var(--radius) var(--radius) 0 0;
  background: linear-gradient(180deg, rgba(255,255,255,.055), transparent);
  pointer-events: none;
}

.card > * { position: relative; }

.card h2 {
  font-size: 19px;
  margin: 0 0 12px;
  color: var(--gold-soft);
  font-weight: 700;
  letter-spacing: .04em;
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.card h2 .num {
  font-family: var(--font-serif);
  font-size: 13px;
  color: var(--gold);
  opacity: .85;
  flex: none;
}

.card h3 {
  font-size: 15.5px;
  margin: 20px 0 8px;
  color: var(--gold-soft);
  opacity: .95;
  font-weight: 700;
}

.card h3:first-child { margin-top: 0; }

.card p { margin: 0 0 12px; color: var(--paper-dim); }
.card p:last-child { margin-bottom: 0; }

.card ul, .card ol { margin: 0 0 12px; padding-left: 1.35em; color: var(--paper-dim); }
.card li { margin-bottom: 6px; }
.card li:last-child { margin-bottom: 0; }

.card strong { color: var(--paper); font-weight: 700; }

a { color: var(--gold); text-decoration: none; border-bottom: 1px solid rgba(236,164,66,.36); }
a:hover { color: var(--gold-soft); border-bottom-color: var(--gold-soft); }

/* --- highlight / callout ------------------------------------------------- */
.callout {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: linear-gradient(180deg, rgba(184,71,23,.22), rgba(184,71,23,.08));
  border: 1px solid rgba(212, 92, 28, .42);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 0 0 18px;
}

.callout .seal {
  flex: none;
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: linear-gradient(180deg, var(--cinnabar-lit), var(--cinnabar));
  color: #fff2e2;
  font-size: 15px;
  font-weight: 800;
  display: grid;
  place-items: center;
  box-shadow: 0 4px 12px rgba(184,71,23,.45);
}

.callout p { margin: 0; color: var(--paper); font-size: 14.6px; }

/* --- info grid ----------------------------------------------------------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.tile {
  background: linear-gradient(180deg, rgba(49,125,130,.20), rgba(23,40,43,.90));
  border: 1px solid rgba(107,184,186,.26);
  border-radius: 14px;
  padding: 16px 18px;
}

.tile .k {
  font-size: 11px;
  letter-spacing: .20em;
  text-transform: uppercase;
  color: var(--teal-soft);
  opacity: .9;
  margin-bottom: 6px;
}

.tile .v { font-size: 15px; color: var(--paper); word-break: break-word; }
.tile .v.small { font-size: 13.6px; color: var(--paper-dim); }

/* --- FAQ ----------------------------------------------------------------- */
details.faq {
  border: 1px solid rgba(236,164,66,.20);
  border-radius: 14px;
  background: rgba(32,51,54,.55);
  margin-bottom: 10px;
  overflow: hidden;
}

details.faq[open] { border-color: rgba(236,164,66,.42); }

details.faq summary {
  cursor: pointer;
  padding: 15px 18px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--paper);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

details.faq summary::-webkit-details-marker { display: none; }

details.faq summary::after {
  content: "+";
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--gold);
  flex: none;
  transition: transform .2s ease;
}

details.faq[open] summary::after { transform: rotate(45deg); }

details.faq .body {
  padding: 0 18px 16px;
  color: var(--paper-dim);
  font-size: 14.8px;
}

details.faq .body p { margin: 0 0 10px; }
details.faq .body p:last-child { margin-bottom: 0; }

/* --- contact ------------------------------------------------------------- */
.contact {
  text-align: center;
  background: linear-gradient(180deg, rgba(45,68,70,.70), rgba(14,28,31,.92));
  border: 1px solid rgba(236,164,66,.34);
  border-radius: var(--radius);
  padding: 32px 24px;
  margin-top: 26px;
}

.contact .label {
  font-size: 11px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--teal-soft);
  margin-bottom: 12px;
}

.contact .mail {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--gold);
  border-bottom: 0;
  word-break: break-all;
}

.contact .mail:hover { color: var(--gold-soft); }

.contact .note { margin: 14px 0 0; color: var(--paper-faint); font-size: 13.4px; }

/* --- footer -------------------------------------------------------------- */
footer {
  margin-top: 46px;
  padding-top: 22px;
  border-top: 1px solid rgba(236,164,66,.16);
  text-align: center;
  color: var(--paper-faint);
  font-size: 12.6px;
  line-height: 2;
}

footer .links { margin-bottom: 8px; }
footer .links a { font-size: 13px; }

/* --- nav back ------------------------------------------------------------ */
.back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  font-size: 13.6px;
  color: var(--paper-dim);
  border-bottom: 0;
}

.back:hover { color: var(--gold); }

/* --- responsive ---------------------------------------------------------- */
@media (max-width: 520px) {
  .wrap { padding: 26px 16px 60px; }
  h1 { font-size: 29px; }
  .brand img { width: 46px; height: 46px; }
  .brand-name { font-size: 19px; }
  .brand-sub { font-size: 10px; letter-spacing: .16em; }
  .card { padding: 19px 17px; }
  .card h2 { font-size: 17px; }
  .contact .mail { font-size: 18px; }
  .lang-switch button { padding: 6px 11px; font-size: 12px; }
  body { font-size: 15.4px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}