:root {
  --ink: #1c1a17;
  --deep: #3d5a48;
  --deep-2: #2f4638;
  --line: rgba(28, 26, 23, 0.12);
  --paper: #f4f0e7;
  --font-display: "Noto Serif SC", "Songti SC", serif;
  --font-body: "Source Sans 3", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1000px 600px at 8% -8%, #e5efe4, transparent 55%),
    radial-gradient(800px 500px at 100% 0%, #efe3d2, transparent 50%),
    linear-gradient(165deg, #f7f3eb, #e8efe7 60%, #ebe4d7);
}
.grain {
  position: fixed; inset: 0; pointer-events: none; opacity: 0.07; z-index: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.hero, .steps, .layout { position: relative; z-index: 1; max-width: 1200px; margin: 0 auto; }

.hero {
  padding: 28px 22px 10px;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}
.eyebrow { margin: 0; color: var(--deep); font-weight: 700; letter-spacing: 0.08em; font-size: 0.85rem; }
.hero h1 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  letter-spacing: 0.06em;
}
.lead { margin: 10px 0 0; max-width: 42rem; color: rgba(28,26,23,0.68); line-height: 1.6; }
.hero-aside { display: grid; gap: 8px; align-content: start; }
.link {
  color: var(--deep);
  font-weight: 700;
  text-decoration: none;
}
.id-live {
  margin: 6px 0 0;
  font-size: 0.82rem;
  color: rgba(28,26,23,0.55);
  word-break: break-all;
}

.steps {
  padding: 8px 16px 0;
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: 6px;
}
.step-dot {
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.55);
  border-radius: 12px;
  padding: 8px 4px;
  text-align: center;
  font-size: 0.68rem;
  font-weight: 700;
  cursor: pointer;
  color: rgba(28,26,23,0.6);
}
.step-dot.active, .step-dot.done {
  background: var(--deep);
  border-color: var(--deep);
  color: #f4f7f4;
}
.step-dot.done:not(.active) { background: #6f8a76; border-color: #6f8a76; }

.layout {
  padding: 16px 22px 36px;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: 18px;
  align-items: start;
}

.panel, .preview-card, .dossier {
  background: rgba(255,255,255,0.62);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 16px 40px rgba(28,26,23,0.07);
}
.panel { padding: 20px; }
.step-kicker { margin: 0; color: var(--deep); font-weight: 700; font-size: 0.85rem; }
.panel h2 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: 1.55rem;
}
.step-desc { margin: 8px 0 0; color: rgba(28,26,23,0.65); line-height: 1.55; }
.step-body { margin-top: 16px; display: grid; gap: 12px; }

.choice-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
}
.choice {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 14px;
  padding: 12px;
  text-align: left;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.2s, background 0.2s;
}
.choice:hover { transform: translateY(-1px); }
.choice.active {
  background: var(--deep-2);
  border-color: var(--deep-2);
  color: #f4f7f4;
}
.choice strong { display: block; font-size: 0.95rem; }
.choice span { display: block; margin-top: 4px; font-size: 0.78rem; opacity: 0.75; line-height: 1.35; }

.field {
  display: grid;
  gap: 6px;
}
.field label { font-weight: 700; font-size: 0.9rem; }
.field input[type="text"], .field input[type="range"], .field textarea, .field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  font: inherit;
  background: #fff;
}
.field textarea { min-height: 84px; resize: vertical; }
.row-vals { display: flex; justify-content: space-between; font-size: 0.85rem; color: rgba(28,26,23,0.55); }

.colors {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.color-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 8px 10px;
}
.color-item input { width: 42px; height: 28px; border: none; background: transparent; padding: 0; }

.tip {
  padding: 12px 14px;
  border-radius: 14px;
  background: rgba(61,90,72,0.08);
  color: rgba(28,26,23,0.78);
  font-size: 0.9rem;
  line-height: 1.5;
}

.nav-row {
  margin-top: 18px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 12px;
  padding: 11px 16px;
  font: 700 0.92rem var(--font-body);
  cursor: pointer;
}
.btn.primary { background: var(--deep); border-color: var(--deep); color: #f4f7f4; }
.btn.wide { width: 100%; margin-top: 12px; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.side { display: grid; gap: 12px; }
.preview-card, .ai-card { padding: 12px; }
.ai-card {
  background: rgba(255,255,255,0.62);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 16px 40px rgba(28,26,23,0.07);
}
.ai-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}
.ai-head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
}
.ai-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--deep);
  background: rgba(61,90,72,0.1);
  border-radius: 999px;
  padding: 4px 8px;
  white-space: nowrap;
}
.ai-frame {
  position: relative;
  aspect-ratio: 1;
  border-radius: 14px;
  overflow: hidden;
  background: #161411;
  display: grid;
  place-items: center;
}
.ai-placeholder {
  margin: 0;
  padding: 16px;
  text-align: center;
  color: rgba(247,243,235,0.62);
  font-size: 0.88rem;
  line-height: 1.45;
}
#aiImage {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.ai-status {
  margin: 8px 2px 8px;
  font-size: 0.82rem;
  color: rgba(28,26,23,0.55);
  min-height: 1.2em;
}
.ai-frame.loading::after {
  content: "生成中…";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(10,8,6,0.45);
  color: #f7f3eb;
  font-weight: 700;
}
#preview {
  width: 100%;
  aspect-ratio: 1;
  display: block;
  border-radius: 14px;
  background: #141210;
}
.preview-cap { margin: 8px 2px 2px; font-size: 0.82rem; color: rgba(28,26,23,0.55); }
.dossier { padding: 14px; font-size: 0.88rem; line-height: 1.55; }
.dossier h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.05rem;
}
.dossier dl { margin: 0; display: grid; gap: 6px; }
.dossier dt { font-weight: 700; }
.dossier dd { margin: 0; color: rgba(28,26,23,0.7); }
.fine { margin: 0; font-size: 0.78rem; color: rgba(28,26,23,0.5); line-height: 1.45; }

@media (max-width: 920px) {
  .steps { grid-template-columns: repeat(3, 1fr); }
  .layout { grid-template-columns: 1fr; padding: 12px 14px 28px; }
  .hero { padding: 22px 14px 8px; }
}