/* ————————————————————————————————————————————————
   Aurum · 金价
   editorial / engraved · single-screen on iPhone 16/17
   Fraunces (display, italic) + JetBrains Mono (figures)
   ———————————————————————————————————————————————— */

:root {
  --bg: #0c0a08;
  --ink: #ece5d4;
  --ink-soft: #a89c87;
  --ink-faint: #6c624f;
  --ink-ghost: #443c2c;

  --gold: #c9a961;
  --gold-deep: #8a7034;
  --gold-glow: rgba(201, 169, 97, 0.10);
  --gold-tint: rgba(201, 169, 97, 0.05);

  --rule: #2a2318;
  --rule-soft: #1d1810;

  --good: #91a878;
  --warn: #c89154;
  --bad: #b65f4f;

  /* per-card tones — three subtly different metals */
  --t-champagne: #c9a961;        /* champagne gold (London) */
  --t-champagne-deep: #8a7034;
  --t-champagne-soft: rgba(201, 169, 97, 0.07);
  --t-champagne-bg: rgba(201, 169, 97, 0.025);

  --t-copper: #c47550;            /* warm copper (China Au9999) */
  --t-copper-deep: #82452a;
  --t-copper-soft: rgba(196, 117, 80, 0.07);
  --t-copper-bg: rgba(196, 117, 80, 0.025);

  --t-pewter: #9c9684;            /* pewter / cool gold (GLD) */
  --t-pewter-deep: #5e5946;
  --t-pewter-soft: rgba(156, 150, 132, 0.07);
  --t-pewter-bg: rgba(156, 150, 132, 0.025);

  --serif: 'Fraunces', 'Iowan Old Style', 'Source Serif Pro', Georgia, serif;
  --serif-cn: 'Songti SC', 'STSongti-SC-Regular', 'STSong', 'Source Han Serif SC', 'Noto Serif CJK SC', SimSun, serif;
  --mono: 'JetBrains Mono', 'IBM Plex Mono', 'SF Mono', ui-monospace, 'Menlo', monospace;
  --sans: -apple-system, BlinkMacSystemFont, 'Helvetica Neue', 'PingFang SC', 'Noto Sans CJK SC', sans-serif;

  --pad-x: clamp(18px, 5vw, 36px);
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3ead8;
    --ink: #1a140d;
    --ink-soft: #5d4f3a;
    --ink-faint: #968870;
    --ink-ghost: #c2b394;
    --gold: #8b6d2c;
    --gold-deep: #5a4218;
    --gold-glow: rgba(139, 109, 44, 0.10);
    --gold-tint: rgba(139, 109, 44, 0.04);
    --rule: #d4c8ac;
    --rule-soft: #e3d9bf;
    --good: #4d6b39;
    --warn: #a86d28;
    --bad: #8e3625;

    --t-champagne: #8b6d2c;
    --t-champagne-deep: #5a4218;
    --t-champagne-soft: rgba(139, 109, 44, 0.08);
    --t-champagne-bg: rgba(139, 109, 44, 0.03);

    --t-copper: #934425;
    --t-copper-deep: #6a2e16;
    --t-copper-soft: rgba(147, 68, 37, 0.08);
    --t-copper-bg: rgba(147, 68, 37, 0.03);

    --t-pewter: #5e5946;
    --t-pewter-deep: #3a3528;
    --t-pewter-soft: rgba(94, 89, 70, 0.08);
    --t-pewter-bg: rgba(94, 89, 70, 0.03);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  text-rendering: optimizeLegibility;
}

html, body { height: 100%; }

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

/* atmospheric pools — drift to corners */
.atmosphere {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(700px 420px at 90% -10%, var(--gold-glow), transparent 65%),
    radial-gradient(560px 360px at -10% 110%, var(--gold-glow), transparent 70%);
}

/* fine grain */
.grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  opacity: 0.5;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='200'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.55 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}

main, .masthead, .footnote { position: relative; z-index: 2; }

/* ——————————————————————— masthead (compact, 50–60px) */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px var(--pad-x) 14px;
  border-bottom: 1px solid var(--rule);
  position: relative;
  flex-shrink: 0;
}

.masthead::after {
  content: '';
  position: absolute;
  left: var(--pad-x);
  right: var(--pad-x);
  bottom: -1px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--gold-deep), transparent);
  opacity: 0.4;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.mark-au {
  font: italic 600 26px/1 var(--serif);
  font-variation-settings: 'opsz' 144;
  color: var(--gold);
  letter-spacing: -0.012em;
}

.mark-cn {
  font: 400 11px/1 var(--serif-cn);
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.mast-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.refresh-btn {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--rule);
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: color 0.25s, border-color 0.25s, background 0.25s, transform 0.15s;
}
.refresh-btn:hover {
  color: var(--gold);
  border-color: color-mix(in oklab, var(--gold) 50%, var(--rule));
  background: var(--gold-tint);
}
.refresh-btn:active { transform: scale(0.94); }
.refresh-btn.spinning svg { animation: spin 0.85s linear infinite; transform-origin: 50% 50%; }
@keyframes spin { to { transform: rotate(-360deg); } }

/* what-if mode: refresh button becomes the primary action (tap to restore live) */
body.what-if .refresh-btn {
  color: var(--gold);
  border-color: var(--gold);
  background: var(--gold-tint);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--gold) 12%, transparent);
}
body.what-if .refresh-btn::before {
  content: '';
  position: absolute;
  top: -3px; right: -3px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gold);
}
.refresh-btn { position: relative; }

.net {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--good);
  position: relative;
  flex-shrink: 0;
}
.net::after {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: 50%;
  border: 1px solid var(--good);
  opacity: 0.5;
  animation: pulse 2.6s ease-out infinite;
}
@keyframes pulse {
  0% { transform: scale(0.7); opacity: 0.7; }
  100% { transform: scale(2.2); opacity: 0; }
}
.net.offline { background: var(--bad); }
.net.offline::after { border-color: var(--bad); animation: none; opacity: 0.35; transform: scale(1.4); }
.net.stale { background: var(--warn); }
.net.stale::after { border-color: var(--warn); }

/* ——————————————————————— ledger (the 3 cards fill remaining space) */

.ledger {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 0 var(--pad-x);
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
  min-height: 0;
}

.card {
  position: relative;
  flex: 1;
  min-height: 0;
  padding: 18px 6px 18px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  border-bottom: 1px solid var(--rule);
}
.card:last-child { border-bottom: 0; }

/* tone variants */
.card[data-tone="champagne"] {
  --tone: var(--t-champagne);
  --tone-deep: var(--t-champagne-deep);
  --tone-soft: var(--t-champagne-soft);
  --tone-bg: var(--t-champagne-bg);
}
.card[data-tone="copper"] {
  --tone: var(--t-copper);
  --tone-deep: var(--t-copper-deep);
  --tone-soft: var(--t-copper-soft);
  --tone-bg: var(--t-copper-bg);
}
.card[data-tone="pewter"] {
  --tone: var(--t-pewter);
  --tone-deep: var(--t-pewter-deep);
  --tone-soft: var(--t-pewter-soft);
  --tone-bg: var(--t-pewter-bg);
}

.card {
  background: radial-gradient(160% 100% at 100% 100%, var(--tone-bg), transparent 60%);
}

/* corner brackets — top-left & bottom-right, in the card's tone */
.card::before, .card::after {
  content: '';
  position: absolute;
  width: 7px;
  height: 7px;
  border-color: var(--tone-deep);
  opacity: 0.7;
  pointer-events: none;
  transition: opacity 0.3s;
}
.card::before {
  top: 8px; left: -2px;
  border-top: 1px solid; border-left: 1px solid;
}
.card::after {
  bottom: 8px; right: -2px;
  border-bottom: 1px solid; border-right: 1px solid;
}
.card:focus-within::before, .card:focus-within::after {
  opacity: 1;
  border-color: var(--tone);
}

/* head */

.card-head {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.lot {
  font: italic 700 14px/1 var(--serif);
  font-variation-settings: 'opsz' 60;
  color: var(--tone);
  letter-spacing: 0.06em;
  margin-top: 1px;
  flex-shrink: 0;
  min-width: 18px;
  opacity: 0.85;
}

.title-stack {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
  flex: 1;
}

.title {
  font: italic 500 17px/1.15 var(--serif);
  font-variation-settings: 'opsz' 60;
  color: var(--ink);
  letter-spacing: -0.005em;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 4px;
}

.title .ticker-sym {
  font: italic 400 12px/1 var(--serif);
  font-variation-settings: 'opsz' 60;
  color: var(--tone-deep);
  letter-spacing: 0.02em;
}

.title .ticker-sym sub {
  font-size: 0.72em;
  vertical-align: -0.1em;
  letter-spacing: 0;
}

.subtitle {
  font: 500 9px/1.3 var(--mono);
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  text-transform: uppercase;
}

/* source pill */
.src {
  font: 500 9px/1 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 4px 7px;
  border: 1px solid var(--rule);
  white-space: nowrap;
  flex-shrink: 0;
  align-self: flex-start;
  margin-top: 2px;
}
.src[data-level="primary"] {
  color: var(--good);
  border-color: color-mix(in oklab, var(--good) 40%, var(--rule));
}
.src[data-level="fb1"] {
  color: var(--warn);
  border-color: color-mix(in oklab, var(--warn) 40%, var(--rule));
}
.src[data-level="fb2"] {
  color: var(--bad);
  border-color: color-mix(in oklab, var(--bad) 40%, var(--rule));
}

/* session badge inline in title */
.session {
  display: inline-block;
  font: 500 9px/1 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 3px 6px;
  border: 1px solid var(--rule);
  vertical-align: 3px;
  margin-left: 2px;
}
.session:empty { display: none; }
.session[data-state="REGULAR"] {
  color: var(--good);
  border-color: color-mix(in oklab, var(--good) 40%, var(--rule));
}
.session[data-state="PRE"], .session[data-state="POST"] {
  color: var(--warn);
  border-color: color-mix(in oklab, var(--warn) 40%, var(--rule));
}
.session[data-state="CLOSED"] {
  color: var(--ink-faint);
  border-color: var(--rule);
}
.session[data-state="IMPLIED"] {
  color: var(--tone);
  border-color: color-mix(in oklab, var(--tone) 50%, var(--rule));
  background: var(--tone-soft);
}

/* the figure — currency mark · big number · unit */

.figure {
  display: flex;
  align-items: baseline;
  gap: 8px;
  cursor: text;
  position: relative;
  padding: 2px 0 6px;
  border-bottom: 1px solid var(--ink-ghost);
  transition: border-color 0.3s;
}
.figure::after {
  content: '';
  position: absolute;
  left: 0; bottom: -1px;
  height: 1px;
  width: 0;
  background: var(--tone);
  transition: width 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}
.figure:focus-within { border-bottom-color: transparent; }
.figure:focus-within::after { width: 100%; }

.currency-mark {
  font: italic 500 28px/1 var(--serif);
  font-variation-settings: 'opsz' 144;
  color: var(--tone);
  flex-shrink: 0;
  min-width: 16px;
  letter-spacing: -0.02em;
}

.figure input {
  font: 500 36px/1 var(--mono);
  font-feature-settings: 'tnum';
  background: transparent;
  border: 0;
  outline: none;
  color: var(--ink);
  width: 100%;
  padding: 1px 0;
  letter-spacing: -0.03em;
  appearance: textfield;
  -moz-appearance: textfield;
  flex: 1;
  min-width: 0;
}
.figure input::-webkit-outer-spin-button,
.figure input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.figure input::placeholder {
  color: var(--ink-ghost);
  font-weight: 400;
}

.unit {
  font: 500 9px/1 var(--mono);
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  text-transform: uppercase;
  flex-shrink: 0;
  align-self: center;
  white-space: nowrap;
}
.unit .slash {
  color: var(--tone-deep);
  margin: 0 1px;
  font-style: italic;
  font-weight: 400;
}

/* hint */

.hint {
  font: italic 400 12.5px/1.45 var(--serif);
  font-variation-settings: 'opsz' 14;
  color: var(--ink-soft);
  letter-spacing: 0.005em;
  margin: 0;
}

.hint b {
  font-style: normal;
  font-family: var(--mono);
  font-weight: 500;
  font-feature-settings: 'tnum';
  color: var(--ink);
  font-size: 0.86em;
  letter-spacing: -0.01em;
  padding: 0 1px;
}

.hint-extra {
  display: block;
  font-size: 0.92em;
  color: var(--ink-faint);
  margin-top: 2px;
}
.hint-extra:empty { display: none; }

/* flash on price update — uses card's tone */

@keyframes flash-card {
  0% {
    background: var(--tone-soft), radial-gradient(160% 100% at 100% 100%, var(--tone-bg), transparent 60%);
    box-shadow: inset 2px 0 0 var(--tone);
  }
  100% {
    box-shadow: none;
  }
}
.card.flash {
  animation: flash-card 1.1s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ——————————————————————— footnote (USD/CNY · updated, bottom-right) */

.footnote {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px var(--pad-x) 14px;
  border-top: 1px solid var(--rule);
  position: relative;
  flex-shrink: 0;
  font-feature-settings: 'tnum';
}
.footnote::before {
  content: '';
  position: absolute;
  left: var(--pad-x);
  right: var(--pad-x);
  top: -1px;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--gold-deep), transparent);
  opacity: 0.4;
}

.ref-label {
  font: 500 9px/1 var(--mono);
  letter-spacing: 0.22em;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.ref-label .dot { color: var(--gold-deep); margin: 0 2px; }

.ref-value {
  font: 500 12px/1 var(--mono);
  font-feature-settings: 'tnum';
  color: var(--ink);
  letter-spacing: -0.01em;
}

.ref-sep {
  color: var(--ink-ghost);
  font-size: 11px;
}

.ref-meta {
  font: 500 11px/1 var(--mono);
  font-feature-settings: 'tnum';
  color: var(--ink-soft);
  letter-spacing: -0.005em;
}

/* ——————————————————————— entrance fade only (no Y translate to avoid shift) */

.brand, .card, .footnote {
  animation: fade-in 0.7s ease-out backwards;
}
.brand { animation-delay: 0.04s; }
.card[data-key="xau"] { animation-delay: 0.16s; }
.card[data-key="cn"]  { animation-delay: 0.24s; }
.card[data-key="gld"] { animation-delay: 0.32s; }
.footnote { animation-delay: 0.40s; }

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ——————————————————————— responsive: scale up for taller / wider */

@media (min-height: 820px) {
  .mark-au { font-size: 28px; }
  .title { font-size: 18px; }
  .figure input { font-size: 40px; }
  .currency-mark { font-size: 30px; }
  .hint { font-size: 13px; }
}

@media (min-width: 640px) {
  body { font-size: 17px; }
  .figure input { font-size: 44px; }
  .currency-mark { font-size: 34px; }
  .title { font-size: 20px; }
  .lot { font-size: 16px; }
}

/* ——————————————————————— motion preferences */

@media (prefers-reduced-motion: reduce) {
  .brand, .card, .footnote { animation: none; }
  .net::after { animation: none; }
  .refresh-btn.spinning svg { animation: spin 1.6s linear infinite; }
  .card.flash { animation: none; transition: background 0.6s; }
  .figure::after { transition: none; }
}