/* 丝路纹生 · 深色西域美学 */
:root {
  --bg: #0c0a09;
  --bg-elev: #161210;
  --panel: #1c1712;
  --border: #3d2e22;
  --gold: #c9a227;
  --gold-dim: #8a7020;
  --sand: #d4b896;
  --sand-dim: #a89070;
  --turquoise: #2a8f8a;
  --coral: #b85c38;
  --ink: #e8dcc8;
  --muted: #8a7a68;
  --danger: #c45c4a;
  --radius: 12px;
  --font-display: "Songti SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-ui: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
}

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

html, body {
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-ui);
  line-height: 1.55;
}

body {
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(201,162,39,0.12), transparent),
    radial-gradient(ellipse 40% 40% at 100% 100%, rgba(42,143,138,0.08), transparent);
}

.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

/* Header */
.hero {
  text-align: center;
  margin-bottom: 28px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.hero::before {
  content: "";
  display: block;
  width: 120px;
  height: 2px;
  margin: 0 auto 18px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.4rem);
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--sand);
  text-shadow: 0 0 40px rgba(201,162,39,0.25);
}
.hero .sub {
  margin-top: 8px;
  font-size: 0.95rem;
  color: var(--gold);
  letter-spacing: 0.35em;
}
.hero .desc {
  margin: 14px auto 0;
  max-width: 640px;
  font-size: 0.88rem;
  color: var(--muted);
}
.badge {
  display: inline-block;
  margin-top: 14px;
  padding: 4px 12px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--turquoise);
  border: 1px solid rgba(42,143,138,0.45);
  border-radius: 999px;
  background: rgba(42,143,138,0.08);
}

/* Layout */
.layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 20px;
  align-items: start;
}
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.35);
}
.panel h2 {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.ctrl label {
  display: block;
  font-size: 0.78rem;
  color: var(--sand-dim);
  margin: 12px 0 6px;
  letter-spacing: 0.06em;
}
.ctrl label span.val {
  float: right;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.ctrl input[type="range"] {
  width: 100%;
  accent-color: var(--gold);
  cursor: pointer;
}
.ctrl select, .ctrl input[type="color"] {
  width: 100%;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  color: var(--ink);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.85rem;
}
.ctrl input[type="color"] {
  height: 36px;
  padding: 4px;
  cursor: pointer;
}
.swatches {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 4px;
}
.swatch-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.swatch-item span {
  font-size: 0.7rem;
  color: var(--muted);
}

.btn-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-top: 18px;
}
button {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, transform 0.1s;
}
button:active { transform: scale(0.98); }
.btn-primary {
  background: linear-gradient(135deg, #a8841c, #c9a227);
  color: #1a1408;
  border-color: var(--gold);
  font-weight: 600;
  grid-column: 1 / -1;
}
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost {
  background: var(--bg-elev);
  color: var(--sand);
}
.btn-ghost:hover {
  border-color: var(--gold-dim);
  color: var(--gold);
}
.btn-accent {
  background: rgba(42,143,138,0.15);
  color: #7ec8c4;
  border-color: rgba(42,143,138,0.4);
  grid-column: 1 / -1;
}
.btn-accent:hover { background: rgba(42,143,138,0.28); }
.btn-danger {
  background: rgba(196,92,74,0.12);
  color: #e8a090;
  border-color: rgba(196,92,74,0.35);
}

.hint {
  margin-top: 14px;
  font-size: 0.72rem;
  color: var(--muted);
  line-height: 1.5;
}

/* Stage */
.stage-wrap { display: flex; flex-direction: column; gap: 16px; }
.canvas-frame {
  position: relative;
  background: #080706;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 420px;
  overflow: hidden;
}
.canvas-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(201,162,39,0.06) 1px, transparent 1px),
    linear-gradient(rgba(201,162,39,0.06) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.35;
  pointer-events: none;
}
#patternCanvas {
  position: relative;
  z-index: 1;
  max-width: 100%;
  border-radius: 4px;
  box-shadow: 0 0 0 1px rgba(201,162,39,0.25), 0 12px 48px rgba(0,0,0,0.5);
}

.meta-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  font-size: 0.78rem;
  color: var(--muted);
  padding: 0 4px;
}
.meta-bar strong { color: var(--sand); font-weight: 500; }

/* Gallery */
.gallery {
  margin-top: 8px;
}
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 10px;
}
.gallery-item {
  position: relative;
  aspect-ratio: 1;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: #080706;
  cursor: pointer;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.gallery-item .del {
  position: absolute;
  top: 4px;
  right: 4px;
  width: 22px;
  height: 22px;
  padding: 0;
  font-size: 12px;
  line-height: 20px;
  border-radius: 50%;
  background: rgba(0,0,0,0.65);
  color: #e8a090;
  border: none;
  display: none;
}
.gallery-item:hover .del { display: block; }
.gallery-empty {
  font-size: 0.82rem;
  color: var(--muted);
  padding: 12px 0;
}

.footer {
  margin-top: 36px;
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.08em;
}
.footer a { color: var(--gold-dim); text-decoration: none; }

.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  background: var(--panel);
  border: 1px solid var(--gold-dim);
  color: var(--sand);
  padding: 10px 20px;
  border-radius: 999px;
  font-size: 0.85rem;
  opacity: 0;
  transition: all 0.3s;
  z-index: 100;
  pointer-events: none;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* —— overnight v3.2 polish —— */
.guide-bar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 8px 16px; margin: 0 0 12px;
  background: linear-gradient(90deg, rgba(201,162,39,0.18), rgba(42,143,138,0.12));
  border: 1px solid rgba(201,162,39,0.35); border-radius: 10px;
  font-size: 0.8rem; color: var(--sand);
}
.guide-bar kbd {
  display: inline-block; min-width: 1.2em; padding: 1px 6px; margin: 0 2px;
  border: 1px solid var(--gold-dim); border-radius: 4px;
  background: rgba(0,0,0,0.35); font-size: 0.75rem; font-family: inherit;
}
.guide-dismiss {
  border: none; background: transparent; color: var(--gold); cursor: pointer;
  font-size: 0.78rem; text-decoration: underline;
}
.help-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.62);
  display: flex; align-items: center; justify-content: center; z-index: 200;
}
.help-overlay[hidden] { display: none !important; }
.help-card {
  max-width: 520px; width: 90%; padding: 28px 28px 22px;
  background: var(--panel); border: 1px solid var(--gold-dim); border-radius: 14px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.45);
}
.help-card h2 { margin: 0 0 12px; font-size: 1.15rem; color: var(--gold); letter-spacing: 0.08em; }
.help-card ul { margin: 0 0 14px; padding-left: 1.2em; line-height: 1.65; color: var(--sand); font-size: 0.9rem; }
.help-keys { font-size: 0.78rem; color: var(--muted); margin-bottom: 14px; }
.export-flash {
  position: fixed; inset: 0; pointer-events: none; z-index: 150;
  background: radial-gradient(circle at 60% 40%, rgba(255,245,200,0.35), transparent 55%);
  opacity: 0; transition: opacity 0.35s;
}
.export-flash.on { opacity: 1; }
.canvas-frame { transition: box-shadow 0.35s, transform 0.35s; }
.canvas-frame.pulse {
  box-shadow: 0 0 0 2px var(--gold), 0 0 28px rgba(201,162,39,0.35);
  transform: scale(1.005);
}
button:focus-visible, select:focus-visible, input:focus-visible {
  outline: 2px solid var(--gold); outline-offset: 2px;
}
.gallery-empty {
  display: flex; flex-direction: column; align-items: flex-start; gap: 8px;
  padding: 18px; border: 1px dashed rgba(201,162,39,0.35); border-radius: 10px;
  background: rgba(201,162,39,0.05);
}
.gallery-empty .cta {
  display: inline-block; padding: 6px 12px; border-radius: 999px;
  border: 1px solid var(--gold-dim); color: var(--gold); font-size: 0.8rem; cursor: pointer;
  background: transparent;
}
.toast.err { border-color: #c45c4a; color: #f0c0b4; }
@keyframes motifPop { from { opacity: 0.4; transform: scale(0.985); } to { opacity: 1; transform: scale(1); } }
.canvas-frame.pop { animation: motifPop 0.45s ease; }

.workflow-card { max-width: 640px; }
.wf-steps { margin: 0 0 14px; padding-left: 1.2em; line-height: 1.65; color: var(--sand); font-size: 0.88rem; }
.wf-steps li { margin-bottom: 8px; }
.wf-switch { display: flex; align-items: center; gap: 10px; font-size: 0.88rem; color: var(--gold); margin: 10px 0 8px; cursor: pointer; }
.wf-switch input { width: 18px; height: 18px; accent-color: var(--gold); }
.wf-status { font-size: 0.82rem; color: var(--muted); margin: 0 0 12px; }
.wf-status.on { color: #e8c56a; }
@media (max-width: 720px) {
  .layout { grid-template-columns: 1fr !important; }
  .hero h1 { font-size: 1.6rem; }
  .guide-bar { font-size: 0.72rem; }
  .btn-row { grid-template-columns: 1fr 1fr !important; }
}

/* —— 冲奖加深 · Hero 案例墙 / 母题卡 / 诚实 AIGC —— */
.hero-gate {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 28px;
  align-items: center;
  padding: 36px 28px 48px;
  max-width: 1200px;
  margin: 0 auto;
  position: relative;
}
.hero-gate.is-leaving { opacity: 0; transition: opacity 0.35s ease; pointer-events: none; }
.hero-gate[hidden] { display: none !important; }
.hero-loom {
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  background: #100e0c;
  box-shadow: 0 24px 64px rgba(0,0,0,0.45), inset 0 0 0 1px rgba(201,162,39,0.12);
}
.hero-loom canvas { display: block; width: 100%; height: auto; }
.hero-eyebrow {
  font-size: 0.75rem; letter-spacing: 0.22em; color: var(--turquoise); margin-bottom: 10px;
}
.hero-copy h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.8rem);
  letter-spacing: 0.18em;
  color: var(--sand);
  text-shadow: 0 0 40px rgba(201,162,39,0.28);
}
.hero-tag {
  margin-top: 12px; color: var(--gold); letter-spacing: 0.08em; font-size: 1.05rem;
}
.hero-desc { margin-top: 10px; color: var(--muted); font-size: 0.9rem; max-width: 36em; }
.hero-wall {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 18px 0 20px;
}
.hero-case {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px;
  cursor: pointer;
  color: var(--sand-dim);
  font: inherit;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  animation: caseIn 0.7s ease both;
  transition: border-color 0.15s, transform 0.15s;
}
.hero-case:hover { border-color: var(--gold); transform: translateY(-2px); }
.hero-case canvas { width: 100%; height: auto; border-radius: 6px; display: block; }
.hero-case span { display: block; text-align: center; margin-top: 6px; }
@keyframes caseIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
.hero-cta { width: 100%; padding: 14px 18px; font-size: 1rem; letter-spacing: 0.2em; }
.lab-hidden { display: none !important; }
.hero-compact {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 18px;
  text-align: left; border-bottom: 1px solid var(--border); padding-bottom: 16px; margin-bottom: 20px;
}
.hero-compact h1 { font-size: 1.5rem; letter-spacing: 0.14em; }
.hero-compact .sub { margin-top: 2px; font-size: 0.75rem; }
.motif-cards {
  display: grid; gap: 8px; margin-bottom: 14px; max-height: 280px; overflow: auto;
}
.motif-card {
  text-align: left; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px; cursor: pointer; color: var(--ink); font: inherit;
  transition: border-color 0.15s, background 0.15s;
}
.motif-card strong { display: block; color: var(--gold); font-size: 0.92rem; margin-bottom: 4px; }
.motif-card span { color: var(--muted); font-size: 0.78rem; line-height: 1.4; }
.motif-card.active, .motif-card:hover {
  border-color: var(--gold); background: rgba(201,162,39,0.08);
}
.adv-block { margin: 10px 0 14px; border: 1px solid var(--border); border-radius: 10px; padding: 8px 10px; }
.adv-block summary {
  cursor: pointer; color: var(--sand); letter-spacing: 0.08em; font-size: 0.88rem; margin-bottom: 8px;
}
.aigc-honest {
  margin: 14px 0; padding: 12px; border: 1px dashed rgba(42,143,138,0.45); border-radius: 12px;
  background: rgba(42,143,138,0.06);
}
.aigc-honest h2 { font-size: 0.95rem; color: var(--turquoise); margin-bottom: 8px; }
.aigc-note { font-size: 0.8rem; color: var(--muted); margin-bottom: 10px; }
.aigc-honest input[type="text"] {
  width: 100%; margin: 6px 0 8px; padding: 8px 10px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--bg); color: var(--ink); font: inherit;
}
.aigc-compare {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; font-size: 0.78rem;
}
.aigc-compare .eyebrow { color: var(--gold-dim); letter-spacing: 0.12em; font-size: 0.68rem; margin-bottom: 4px; }
.aigc-muted { color: var(--muted); }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}
@media (max-width: 900px) {
  .hero-gate { grid-template-columns: 1fr; }
  .hero-wall { grid-template-columns: repeat(3, 1fr); }
  .aigc-compare { grid-template-columns: 1fr; }
}