:root {
  --bg: #f7efe4;
  --bg-soft: #f1e4d0;
  --panel: rgba(255, 250, 244, 0.78);
  --panel-strong: rgba(255, 248, 240, 0.92);
  --line: rgba(86, 58, 27, 0.12);
  --text: #241912;
  --muted: #6e5946;
  --primary: #a45c2f;
  --primary-deep: #6f3817;
  --secondary: #204b49;
  --secondary-soft: #2f6b67;
  --accent: #d6a15f;
  --accent-soft: #f2d5ad;
  --danger: #b64a3a;
  --shadow: 0 28px 90px rgba(83, 56, 29, 0.13);
  --shadow-soft: 0 16px 44px rgba(83, 56, 29, 0.1);
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --max-width: 1220px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 8% 10%, rgba(255,255,255,.8), transparent 20%),
    radial-gradient(circle at 86% 14%, rgba(214,161,95,.22), transparent 24%),
    radial-gradient(circle at 82% 78%, rgba(47,107,103,.16), transparent 28%),
    linear-gradient(180deg, #f8f2e9 0%, #f0e2ce 52%, #ead8c3 100%);
  line-height: 1.6;
  overflow-x: hidden;
}
body::before, body::after {
  content: "";
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(10px);
  opacity: .62;
}
body::before {
  width: 360px; height: 360px; top: -140px; right: -80px;
  background: radial-gradient(circle, rgba(214,161,95,.24), transparent 68%);
}
body::after {
  width: 420px; height: 420px; bottom: -180px; left: -140px;
  background: radial-gradient(circle, rgba(47,107,103,.15), transparent 70%);
}
a { color: var(--primary-deep); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.page-shell {
  position: relative; z-index: 1; width: min(calc(100% - 32px), var(--max-width)); margin: 0 auto; padding: 32px 0 48px;
}
.hero, .workspace { display: grid; gap: 22px; align-items: start; }
.hero { grid-template-columns: minmax(0, 1.18fr) minmax(300px, .82fr); margin-bottom: 22px; }
.workspace { grid-template-columns: minmax(0, 1.14fr) minmax(310px, .86fr); }
.hero-card, .status-card, .panel, .info-card {
  position: relative; overflow: hidden; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius-xl); box-shadow: var(--shadow); backdrop-filter: blur(16px);
}
.hero-card::before, .status-card::before, .panel::before, .info-card::before {
  content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(255,255,255,.16), transparent 32%); pointer-events: none;
}
.hero-card {
  padding: 34px 34px 30px;
  background: linear-gradient(135deg, rgba(255,252,248,.98), rgba(247,237,223,.86)), var(--panel);
}
.hero-card::after, .status-card::after {
  content: ""; position: absolute; inset: auto -40px -70px auto; width: 240px; height: 240px; border-radius: 50%; background: radial-gradient(circle, rgba(214,161,95,.24), transparent 70%); pointer-events: none;
}
.eyebrow, .mini-chip, .hero-points span, .progress-stats span {
  display: inline-flex; align-items: center; gap: 8px; border-radius: 999px; border: 1px solid rgba(86,58,27,.08); background: rgba(255,255,255,.72);
}
.eyebrow { padding: 8px 14px; color: var(--primary-deep); font-size: 13px; letter-spacing: .08em; }
h1 { margin: 18px 0 12px; font-family: "Noto Serif SC", serif; font-size: clamp(38px, 5vw, 64px); line-height: 1.04; letter-spacing: .03em; }
.hero-copy { max-width: 54ch; color: var(--muted); font-size: 16px; margin-bottom: 18px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 20px; }
.cta-link, .ghost-link {
  display: inline-flex; align-items: center; gap: 10px; min-height: 48px; padding: 0 18px; border-radius: 999px; text-decoration: none; font-weight: 600; transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.cta-link { color: #fff7ee; background: linear-gradient(135deg, #a45c2f, #7f3f1d); box-shadow: 0 14px 30px rgba(111,56,23,.2); }
.ghost-link { color: var(--text); background: rgba(255,255,255,.64); border: 1px solid rgba(86,58,27,.1); }
.cta-link:hover, .ghost-link:hover, button:hover:not(:disabled) { transform: translateY(-2px); }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
.hero-points span, .mini-chip { padding: 10px 14px; font-size: 14px; box-shadow: inset 0 1px 0 rgba(255,255,255,.4); }
.hero-metrics, .status-grid, .button-grid { display: grid; gap: 12px; }
.hero-metrics { grid-template-columns: repeat(3, minmax(0, 1fr)); margin-top: 22px; }
.metric-card, .status-item, .field, .inline-field, .progress-wrap, .action-panel, .tips, .security-note {
  border-radius: var(--radius-lg); border: 1px solid rgba(86,58,27,.08); background: var(--panel-strong); box-shadow: var(--shadow-soft);
}
.metric-card { padding: 16px; background: rgba(255,255,255,.62); }
.metric-card span { display: block; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.metric-card strong { display: block; font-size: 22px; letter-spacing: -.03em; }
.status-card {
  padding: 28px; display: grid; grid-template-rows: auto auto auto 1fr; gap: 18px;
  background: radial-gradient(circle at 100% 0%, rgba(214,161,95,.2), transparent 32%), linear-gradient(180deg, rgba(33,73,70,.96), rgba(26,52,50,.98)); color: #f5ede2;
}
.status-label { display: flex; justify-content: space-between; align-items: center; gap: 12px; font-size: 14px; color: rgba(245,237,226,.84); }
.status-number { font-size: clamp(32px, 4vw, 52px); line-height: 1.05; font-weight: 600; letter-spacing: -.04em; }
.status-ring, .progress-track { position: relative; height: 14px; border-radius: 999px; overflow: hidden; }
.status-ring { background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.08); }
.status-ring-bar, #progressBar { width: 0%; height: 100%; border-radius: inherit; transition: width .28s ease; }
.status-ring-bar { background: linear-gradient(90deg, #efc98f, #dca15c 45%, #8fd1cb); box-shadow: 0 0 20px rgba(220,161,92,.34); }
.status-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.status-item { padding: 14px; background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.08); }
.status-item span { display: block; font-size: 12px; color: rgba(245,237,226,.74); }
.status-item strong { display: block; margin-top: 6px; font-size: 18px; font-weight: 600; color: #fff7ec; }
.status-story { padding: 14px 16px; border-radius: 18px; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.08); color: rgba(245,237,226,.84); font-size: 13px; }
.panel {
  padding: 26px;
  background: linear-gradient(180deg, rgba(255,252,248,.9), rgba(255,247,236,.84)), var(--panel-strong);
}
.panel-title { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
.panel-title h2, .info-card h3 { margin: 0; font-family: "Noto Serif SC", serif; font-size: 28px; font-weight: 700; }
.panel-title p, .subtle, .tips li, .field-note, .hint, .difficulty-note, .security-note span { margin: 0; color: var(--muted); font-size: 14px; }
.field-grid, .tips, .side-stack, .info-list, .security-note { display: grid; gap: 18px; }
.field, .inline-field, .progress-wrap, .action-panel, .tips, .security-note { padding: 18px; }
.field label, .inline-field label { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; color: var(--text); font-weight: 600; font-size: 15px; }
.label-main { display: inline-flex; align-items: center; gap: 10px; }
textarea, input[type="number"], input[type="text"] {
  width: 100%; border: 1px solid rgba(86,58,27,.12); border-radius: 16px; background: rgba(255,255,255,.92); color: var(--text); padding: 14px 16px; font: inherit; outline: none; transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease, background .2s ease;
}
textarea { min-height: 210px; resize: vertical; }
input[type="number"], input[type="text"] { min-height: 54px; }
textarea:focus, input:focus { border-color: rgba(164,92,47,.42); box-shadow: 0 0 0 4px rgba(164,92,47,.12); transform: translateY(-1px); background: #fffdfa; }
.difficulty-wrap { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 14px; align-items: end; }
.difficulty-note { text-align: right; max-width: 180px; }
.button-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
button {
  appearance: none; border: 0; border-radius: 16px; padding: 14px 16px; font: inherit; font-weight: 600; cursor: pointer; transition: transform .18s ease, box-shadow .18s ease, opacity .18s ease, filter .18s ease;
}
button:active:not(:disabled) { transform: translateY(0); }
button:disabled { cursor: not-allowed; opacity: .5; transform: none; box-shadow: none; }
#btnGenerate { background: linear-gradient(135deg, #ae6336, #8c4820); color: #fffaf3; box-shadow: 0 14px 28px rgba(111,61,29,.18); }
#btnSolve { background: linear-gradient(135deg, #2f6b67, #214c49); color: #fffaf3; box-shadow: 0 14px 28px rgba(33,73,70,.18); }
#btnSample { background: linear-gradient(135deg, #e0b170, #cd8d41); color: #3b2718; box-shadow: 0 14px 28px rgba(192,132,58,.22); }
.progress-wrap { gap: 14px; background: linear-gradient(180deg, rgba(255,251,245,.9), rgba(248,239,226,.9)); }
.progress-head, .progress-meta { display: flex; justify-content: space-between; gap: 16px; align-items: center; flex-wrap: wrap; }
.progress-label { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; }
.progress-track { background: rgba(111,61,29,.1); }
#progressBar { background: linear-gradient(90deg, #d19a51, #a45c2f 55%, #2f6b67); box-shadow: 0 0 24px rgba(155,93,52,.28); }
.progress-stats { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 14px; }
.progress-stats span { padding: 8px 10px; background: rgba(255,255,255,.6); border: 1px solid rgba(86,58,27,.06); }
#txtError { min-height: 24px; padding: 6px 4px 0; color: var(--danger); font-size: 14px; font-weight: 600; }
.tips ul { margin: 0; padding-left: 20px; }
.info-card { padding: 22px; box-shadow: var(--shadow); background: linear-gradient(180deg, rgba(255,252,247,.92), rgba(249,240,227,.84)); }
.info-card h3 { font-size: 22px; margin-bottom: 8px; }
.info-list div { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; align-items: start; color: var(--muted); font-size: 14px; }
.security-note { background: linear-gradient(180deg, rgba(33,73,70,.06), rgba(214,161,95,.08)); }
.security-note strong { display: inline-flex; align-items: center; gap: 8px; color: var(--text); font-size: 15px; }
.footnote { text-align: center; margin: 26px auto 0; color: rgba(66,51,38,.72); font-size: 14px; letter-spacing: .04em; }
.reveal { animation: revealUp .7s ease both; }
.reveal.delay-1 { animation-delay: .08s; }
.reveal.delay-2 { animation-delay: .16s; }
.reveal.delay-3 { animation-delay: .24s; }
@keyframes revealUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
@media (max-width: 980px) {
  .hero, .workspace, .hero-metrics { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .page-shell { width: min(calc(100% - 20px), var(--max-width)); padding: 18px 0 28px; }
  .hero-card, .status-card, .panel, .info-card { border-radius: 24px; }
  .hero-card, .status-card, .panel, .info-card, .tips, .field, .inline-field, .action-panel, .progress-wrap, .security-note { padding: 18px; }
  h1 { font-size: 42px; }
  .hero-actions, .hero-points { flex-direction: column; align-items: stretch; }
  .hero-points span, .mini-chip, .cta-link, .ghost-link { justify-content: center; }
  .difficulty-wrap, .button-grid, .status-grid { grid-template-columns: 1fr; }
  .difficulty-note { text-align: left; max-width: none; }
  .panel-title { flex-direction: column; align-items: flex-start; }
}


.compact-shell { max-width: 980px; }
.compact-hero { grid-template-columns: 1fr 360px; gap: 18px; }
.compact-card { padding: 28px 30px; }
.compact-copy { margin-bottom: 0; font-size: 18px; }
.compact-status { padding: 22px; }
.compact-status-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.single-column { grid-template-columns: 1fr; }
.compact-grid { gap: 14px; }
.dual-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.compact-progress-wrap { padding: 16px 18px; }
.compact-progress-meta { align-items: flex-start; }
@media (max-width: 980px) { .compact-hero { grid-template-columns: 1fr; } }
@media (max-width: 720px) { .dual-grid { grid-template-columns: 1fr; } .compact-status-grid { grid-template-columns: 1fr 1fr; } }


.button-grid-compact { grid-template-columns: repeat(3, minmax(0, 1fr)); }
#btnPause { background: #f0d8a9; color: #5b401a; }
#btnResume { background: #d9ece7; color: #254740; }
#btnStop { background: #eed4cf; color: #7a2f26; }
#btnShare { background: #ede7de; color: #403328; }
@media (max-width: 720px) { .button-grid-compact { grid-template-columns: 1fr 1fr; } }