/* ==========================================================================
   4sljq Site Shell  v2 — 静态页共享设计令牌
   与 site-vue/src/styles/variables.css 保持同步
   ========================================================================== */

:root {
  /* ── Background & Surface（米白） ── */
  --4s-bg: #f5f4f0;
  --4s-surface: #ffffff;
  --4s-surface-elevated: #ebe9e2;
  --4s-surface-strong: #e3e1d8;
  --4s-surface-hover: #d8d6cc;
  --4s-console-surface: #faf9f4;
  --4s-console-border: rgba(16, 185, 129, 0.32);
  --4s-grid-line: rgba(17, 24, 39, 0.045);
  --4s-token-bg: rgba(17, 24, 39, 0.030);

  /* ── Borders ── */
  --4s-border: rgba(0, 0, 0, 0.10);
  --4s-border-strong: rgba(0, 0, 0, 0.18);
  --4s-border-soft: rgba(0, 0, 0, 0.05);

  /* ── Text ── */
  --4s-text: #1a1a1a;
  --4s-text-muted: #595e5b;
  --4s-text-quiet: #8a8e8a;

  /* ── Primary: Emerald ── */
  --4s-primary: #10b981;
  --4s-primary-deep: #047857;
  --4s-primary-soft: rgba(16, 185, 129, 0.12);
  --4s-primary-glow: rgba(16, 185, 129, 0.40);
  --4s-primary-ink: rgba(4, 120, 87, 0.92);

  /* ── Accent / Highlight ── */
  --4s-accent: #d97706;
  --4s-accent-soft: rgba(217, 119, 6, 0.12);
  --4s-highlight: #7c3aed;
  --4s-highlight-soft: rgba(124, 58, 237, 0.12);

  /* ── Semantics ── */
  --4s-success: #10b981;
  --4s-success-soft: rgba(16, 185, 129, 0.12);
  --4s-warn: #d97706;
  --4s-warn-soft: rgba(217, 119, 6, 0.12);
  --4s-danger: #dc2626;
  --4s-danger-soft: rgba(220, 38, 38, 0.12);
  --4s-info: #0ea5e9;
  --4s-info-soft: rgba(14, 165, 233, 0.12);

  /* ── Shadows（克制） ── */
  --4s-shadow-card: 0 1px 0 rgba(0, 0, 0, 0.04);
  --4s-shadow-card-hover: 0 0 0 1px var(--4s-primary-soft);
  --4s-shadow-md: 0 2px 0 rgba(0, 0, 0, 0.04);

  /* ── Static Tool Glass / Optical Panels ── */
  --4s-panel-glass-bg: rgba(255, 255, 255, 0.58);
  --4s-panel-glass-bg-strong: rgba(255, 255, 255, 0.72);
  --4s-panel-glass-border: rgba(16, 185, 129, 0.20);
  --4s-panel-glass-border-strong: rgba(4, 120, 87, 0.30);
  --4s-panel-glass-highlight: rgba(255, 255, 255, 0.78);
  --4s-panel-glass-sheen: rgba(16, 185, 129, 0.11);
  --4s-panel-glass-caustic: rgba(217, 119, 6, 0.13);
  --4s-panel-grid-line: rgba(4, 120, 87, 0.075);
  --4s-panel-grid-accent: rgba(217, 119, 6, 0.10);
  --4s-panel-shadow: 0 10px 36px rgba(17, 24, 39, 0.055), 0 1px 0 rgba(255, 255, 255, 0.58) inset;
  --4s-tool-optic: rgba(14, 165, 233, 0.12);
  --4s-tool-optic-strong: rgba(20, 184, 166, 0.18);
  --4s-tool-grid-accent: rgba(14, 165, 233, 0.08);

  /* ── Toast ── */
  --4s-toast-border-info: rgba(16, 185, 129, 0.55);
  --4s-toast-border-error: rgba(220, 38, 38, 0.55);

  /* ── Radius（4/6） ── */
  --4s-radius-sm: 4px;
  --4s-radius-md: 6px;
  --4s-radius-btn: 6px;
  --4s-radius-card: 6px;
  --4s-radius-full: 9999px;

  /* ── Spacing ── */
  --4s-gap-xs: 4px;
  --4s-gap-sm: 8px;
  --4s-gap-md: 16px;
  --4s-gap-lg: 24px;
  --4s-gap-xl: 32px;
  --4s-gap-2xl: 48px;

  /* ── Text scale ── */
  --4s-text-xs: 11px;
  --4s-text-sm: 12px;
  --4s-text-base: 13px;
  --4s-text-md: 15px;
  --4s-text-lg: 17px;
  --4s-text-xl: 22px;

  /* ── Typography ── */
  --4s-font-base: "Inter", "Segoe UI", "Noto Sans SC", "Source Han Sans SC",
                  "Microsoft YaHei UI", "PingFang SC", "Hiragino Sans GB",
                  system-ui, sans-serif;
  --4s-font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas,
                  "Fira Code", "Noto Sans Mono CJK SC", monospace;

  /* ── Easing ── */
  --4s-ease-quiet: 120ms linear;
  --4s-transition-fast: 120ms linear;
  --4s-transition-base: 150ms linear;

  /* ── Layout ── */
  --4s-status-bar-height: 26px;
  --4s-content-max-width: 1180px;
  --4s-table-stripe: rgba(0, 0, 0, 0.018);

  /* ── Aliases（保留旧名兼容） ── */
  --bg: var(--4s-bg);
  --panel: var(--4s-surface);
  --panel-strong: var(--4s-surface-strong);
  --line: var(--4s-border);
  --line-strong: var(--4s-border-strong);
  --text: var(--4s-text);
  --muted: var(--4s-text-muted);
  --accent: var(--4s-primary);
  --accent-soft: var(--4s-primary-soft);
  --warn: var(--4s-warn);
  --danger: var(--4s-danger);
  --shadow: var(--4s-shadow-card);
}

[data-theme="dark"] {
  --4s-bg: #0d1110;
  --4s-surface: #151916;
  --4s-surface-elevated: #1c211e;
  --4s-surface-strong: #232825;
  --4s-surface-hover: #2a302c;
  --4s-console-surface: #111715;
  --4s-console-border: rgba(16, 185, 129, 0.30);
  --4s-grid-line: rgba(229, 231, 230, 0.045);
  --4s-token-bg: rgba(229, 231, 230, 0.040);

  --4s-border: rgba(255, 255, 255, 0.10);
  --4s-border-strong: rgba(255, 255, 255, 0.18);
  --4s-border-soft: rgba(255, 255, 255, 0.05);

  --4s-text: #e6e8e6;
  --4s-text-muted: #828881;
  --4s-text-quiet: #555a58;

  --4s-primary: #10b981;
  --4s-primary-deep: #34d399;
  --4s-primary-soft: rgba(16, 185, 129, 0.16);
  --4s-primary-glow: rgba(16, 185, 129, 0.36);
  --4s-primary-ink: rgba(52, 211, 153, 0.95);

  --4s-accent-soft: rgba(217, 119, 6, 0.16);
  --4s-highlight-soft: rgba(124, 58, 237, 0.16);
  --4s-success-soft: rgba(16, 185, 129, 0.16);
  --4s-warn-soft: rgba(217, 119, 6, 0.16);
  --4s-danger-soft: rgba(220, 38, 38, 0.16);
  --4s-info-soft: rgba(14, 165, 233, 0.16);

  --4s-shadow-card: 0 1px 0 rgba(0, 0, 0, 0.20);
  --4s-shadow-card-hover: 0 0 0 1px var(--4s-primary-soft);
  --4s-shadow-md: 0 2px 0 rgba(0, 0, 0, 0.20);

  --4s-panel-glass-bg: rgba(13, 17, 16, 0.58);
  --4s-panel-glass-bg-strong: rgba(17, 23, 21, 0.72);
  --4s-panel-glass-border: rgba(16, 185, 129, 0.18);
  --4s-panel-glass-border-strong: rgba(52, 211, 153, 0.28);
  --4s-panel-glass-highlight: rgba(255, 255, 255, 0.075);
  --4s-panel-glass-sheen: rgba(52, 211, 153, 0.12);
  --4s-panel-glass-caustic: rgba(217, 119, 6, 0.08);
  --4s-panel-grid-line: rgba(52, 211, 153, 0.06);
  --4s-panel-grid-accent: rgba(217, 119, 6, 0.055);
  --4s-panel-shadow: 0 12px 42px rgba(0, 0, 0, 0.24), 0 1px 0 rgba(255, 255, 255, 0.045) inset;
  --4s-tool-optic: rgba(56, 189, 248, 0.10);
  --4s-tool-optic-strong: rgba(45, 212, 191, 0.16);
  --4s-tool-grid-accent: rgba(56, 189, 248, 0.055);

  --4s-table-stripe: rgba(255, 255, 255, 0.015);
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
}

body {
  background: var(--4s-bg);
  color: var(--4s-text);
  font-family: var(--4s-font-base);
  font-size: var(--4s-text-base);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.is-tool-embed body { background: transparent; }
.is-tool-embed .tool-shell { width: 100%; padding: 0; }
.is-tool-embed .shell-header { display: none; }
.is-tool-embed .tool-layout, .is-tool-embed .panel-grid { margin-top: 0; }
.tool-shell .hidden { display: none !important; }

a { color: inherit; }
img { max-width: 100%; }
button, select, textarea, input { font: inherit; }

/* ==========================================================================
   Status Bar  A 路径
   ========================================================================== */
.status-bar {
  position: sticky;
  top: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 0;
  height: var(--4s-status-bar-height);
  padding: 0 var(--4s-gap-md);
  background: var(--4s-surface-elevated);
  border-bottom: 1px solid var(--4s-border);
  color: var(--4s-text-muted);
  font-family: var(--4s-font-mono);
  font-size: 11px;
  line-height: 1;
  user-select: none;
  overflow: hidden;
}

.status-bar__seg {
  display: inline-flex;
  align-items: center;
  height: 100%;
  padding: 0 10px;
  border-right: 1px solid var(--4s-border);
  white-space: nowrap;
}

.status-bar__seg:first-child { padding-left: 0; }
.status-bar__seg:last-child  { border-right: 0; margin-left: auto; padding-right: 0; }
.status-bar__seg .accent { color: var(--4s-primary); }
.status-bar__seg .dot {
  display: inline-block;
  width: 6px; height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--4s-primary);
  box-shadow: 0 0 0 2px var(--4s-primary-soft);
  vertical-align: middle;
}

@media (max-width: 640px) {
  .status-bar__seg { padding: 0 6px; }
  .status-bar__seg.seg-clock { display: none; }
}

/* ==========================================================================
   Build Footer  C 路径
   ========================================================================== */
.build-meta {
  width: min(100%, 940px);
  margin: var(--4s-gap-sm) auto 0;
  padding: 7px var(--4s-gap-md) 0;
  border-top: 1px dashed var(--4s-border);
  color: var(--4s-text-quiet);
  font-family: var(--4s-font-mono);
  font-size: 10px;
  letter-spacing: 0;
  line-height: 1.5;
  text-align: center;
  overflow-wrap: anywhere;
}

.build-meta code {
  padding: 1px 4px;
  border: 1px solid var(--4s-border);
  border-radius: var(--4s-radius-sm);
  background: var(--4s-token-bg);
  color: var(--4s-primary-ink);
  font-size: inherit;
}

.build-meta .sep { opacity: 0.5; margin: 0 6px; }

/* ==========================================================================
   ASCII Frame Utility  A 路径
   ========================================================================== */
.ascii-frame {
  position: relative;
  padding: 14px 16px;
  margin-top: 8px;
  border: 1px solid var(--4s-border);
  border-radius: var(--4s-radius-sm);
  background: var(--4s-surface);
}

.ascii-frame::before {
  content: "┌─ " attr(data-title) " ─";
  position: absolute;
  top: -10px;
  left: 14px;
  padding: 0 6px;
  background: var(--4s-bg);
  color: var(--4s-text-muted);
  font-family: var(--4s-font-mono);
  font-size: 11px;
  line-height: 1;
}

.ascii-frame--primary::before { color: var(--4s-primary); }
.ascii-frame--muted::before   { color: var(--4s-text-muted); }

/* ==========================================================================
   Bracket Badge  C 路径
   ========================================================================== */
.bracket-tag {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 6px;
  border: 1px solid var(--4s-primary-soft);
  color: var(--4s-primary-ink);
  font-family: var(--4s-font-mono);
  font-size: 10px;
  line-height: 1;
  white-space: nowrap;
}

.bracket-tag::before { content: "["; opacity: 0.5; margin-right: 2px; }
.bracket-tag::after  { content: "]"; opacity: 0.5; margin-left: 2px; }

.bracket-tag--muted  { border-color: var(--4s-border); color: var(--4s-text-muted); }
.bracket-tag--warn   { border-color: var(--4s-warn-soft);  color: var(--4s-warn); }
.bracket-tag--accent { border-color: var(--4s-accent-soft); color: var(--4s-accent); }

/* ==========================================================================
   Scrollbar
   ========================================================================== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--4s-border-strong);
  border-radius: var(--4s-radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--4s-text-muted); }

/* ==========================================================================
   Forms
   ========================================================================== */
input:not([type]),
input[type="text"], input[type="number"], input[type="password"],
input[type="date"], input[type="search"], select, textarea {
  font-family: var(--4s-font-base);
  font-size: var(--4s-text-md);
  background: var(--4s-surface);
  border: 1px solid var(--4s-border-strong);
  border-radius: var(--4s-radius-btn);
  color: var(--4s-text);
  min-height: 36px;
  height: 36px;
  padding: 7px 11px;
  outline: none;
  transition: border-color var(--4s-transition-fast), background var(--4s-transition-fast);
}

textarea { height: auto; min-height: 72px; }

input:focus, select:focus, textarea:focus {
  border-color: var(--4s-primary);
  background: var(--4s-surface-elevated);
  box-shadow: 0 0 0 3px var(--4s-primary-soft);
}

input:disabled, select:disabled, textarea:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ==========================================================================
   Tables
   ========================================================================== */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--4s-text-sm);
}

thead th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600;
  font-size: 11px;
  color: var(--4s-text-muted);
  text-transform: uppercase;
  background: var(--4s-surface-strong);
  border-bottom: 2px solid var(--4s-border-strong);
}

tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--4s-border);
  color: var(--4s-text);
  vertical-align: middle;
}

tbody tr:hover td { background: var(--4s-surface-hover); }
tbody tr:nth-child(even) td { background: var(--4s-table-stripe); }
tbody tr:nth-child(even):hover td { background: var(--4s-surface-hover); }

/* ==========================================================================
   Layout
   ========================================================================== */
.site-shell, .tool-shell, .project-shell {
  width: min(var(--4s-content-max-width), calc(100vw - 32px));
  margin: 0 auto;
  padding: var(--4s-gap-lg) 0 var(--4s-gap-2xl);
}

.site-main {
  display: flex;
  flex-direction: column;
  gap: var(--4s-gap-lg);
  margin-top: var(--4s-gap-lg);
}

.project-detail-main {
  gap: var(--4s-gap-md);
}

/* Header */
.site-header, .shell-header {
  position: relative;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  gap: var(--4s-gap-md);
  padding: var(--4s-gap-md);
  border-bottom: 1px solid var(--4s-border);
}

.site-brand {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: var(--4s-radius-sm);
  background: transparent;
  padding: 0;
  text-decoration: none;
}

.site-brand img {
  width: 40px;
  height: 40px;
  display: block;
  border-radius: var(--4s-radius-sm);
}

.site-title-block, .shell-brand {
  min-width: 0;
  display: grid;
  gap: 4px;
}

.site-eyebrow, .shell-eyebrow, .hero-status, .status-line {
  color: var(--4s-primary);
  font-size: var(--4s-text-xs);
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.site-title-block h1, .shell-title {
  margin: 0;
  color: var(--4s-text);
  font-size: var(--4s-text-lg);
  line-height: 1.25;
}

.site-title-block p, .shell-subtitle {
  margin: 0;
  color: var(--4s-text-muted);
  font-size: var(--4s-text-sm);
}

.site-nav, .shell-links, .page-actions, .hero-actions, .card-actions,
.tool-actions, .detail-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--4s-gap-sm);
}

.site-nav a, .shell-link {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border-radius: var(--4s-radius-sm);
  color: var(--4s-text-muted);
  font-size: var(--4s-text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--4s-transition-fast), background var(--4s-transition-fast);
}

.site-nav a:hover, .site-nav a.active, .shell-link:hover {
  color: var(--4s-text);
  background: var(--4s-surface-hover);
}

.site-nav a.active {
  color: var(--4s-primary);
  background: var(--4s-primary-soft);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border: 1px solid var(--4s-border);
  border-radius: var(--4s-radius-sm);
  background: var(--4s-surface);
  color: var(--4s-text-muted);
  cursor: pointer;
}

.theme-toggle:hover {
  color: var(--4s-primary);
  border-color: var(--4s-primary-soft);
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--4s-gap-md);
  padding-bottom: var(--4s-gap-md);
  border-bottom: 1px solid var(--4s-border);
}

.page-header h2 {
  margin: 0;
  color: var(--4s-text);
  font-size: var(--4s-text-lg);
  font-weight: 600;
  line-height: 1.3;
}

.page-header p {
  margin: var(--4s-gap-xs) 0 0;
  color: var(--4s-text-muted);
  font-size: var(--4s-text-sm);
}

/* ==========================================================================
   Cards & Panels
   ========================================================================== */
.overview-card, .hero-card, .panel, .project-card, .tool-card,
.tool-layout > section, .highlight-card, .meta-card, .stat {
  position: relative;
  background: var(--4s-surface);
  border: 1px solid var(--4s-border);
  border-radius: var(--4s-radius-card);
  box-shadow: var(--4s-shadow-card);
}

.overview-card, .hero-card, .panel, .tool-layout > section {
  padding: var(--4s-gap-lg);
}

.accent-primary::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: var(--4s-primary);
}

.overview-grid, .meta-grid, .stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--4s-gap-md);
}

.overview-stat {
  display: grid;
  gap: 2px;
  text-align: center;
}

.overview-stat span {
  color: var(--4s-primary);
  font-family: var(--4s-font-mono);
  font-size: var(--4s-text-xl);
  font-weight: 700;
}

.overview-stat small {
  color: var(--4s-text-muted);
  font-size: var(--4s-text-xs);
}

.projects-grid, .tool-grid, .tools-grid, .highlight-grid, .panel-grid, .tool-layout {
  display: grid;
  gap: var(--4s-gap-sm);
}

.projects-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.tools-grid, .tool-grid { grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.panel-grid, .tool-layout { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.highlight-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.project-card, .tool-card {
  overflow: hidden;
  transition: border-color var(--4s-transition-fast), background var(--4s-transition-fast);
}

.project-card:hover, .tool-card:hover {
  border-color: var(--4s-console-border);
  box-shadow: var(--4s-shadow-card-hover);
}

.project-card-link, .tool-card {
  min-height: 112px;
  display: flex;
  align-items: center;
  gap: var(--4s-gap-md);
  padding: var(--4s-gap-md);
  color: inherit;
  text-decoration: none;
}

.project-card-body, .tool-card-body {
  min-width: 0;
  flex: 1;
  display: grid;
  gap: var(--4s-gap-xs);
}

.project-card h2, .tool-card-title, .tool-card h3 {
  margin: 0;
  color: var(--4s-text);
  font-size: var(--4s-text-md);
  font-weight: 600;
}

.project-card p, .tool-card-summary, .tool-card p {
  margin: 0;
  color: var(--4s-text-muted);
  font-size: var(--4s-text-sm);
  line-height: 1.5;
}

.project-card-meta, .tag-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--4s-gap-sm);
}

.info-tag, .tag, .muted-tag, .status-pill, .pill {
  min-height: 24px;
  display: inline-flex;
  align-items: center;
  border-radius: var(--4s-radius-full);
  font-size: var(--4s-text-xs);
}

.info-tag, .status-pill.active, .pill {
  padding: 0 9px;
  background: var(--4s-primary-soft);
  color: var(--4s-primary);
}

.muted-tag, .tag {
  color: var(--4s-text-muted);
}

.tag {
  padding: 0 9px;
  background: var(--4s-surface-strong);
  color: var(--4s-text);
}

.status-pill.planned {
  padding: 0 9px;
  background: var(--4s-warn-soft);
  color: var(--4s-warn);
}

.tool-card-icon {
  font-size: 22px;
  line-height: 1;
  flex-shrink: 0;
}

.card-arrow {
  color: var(--4s-text-muted);
  flex-shrink: 0;
  transition: color var(--4s-transition-fast), transform var(--4s-transition-fast);
}

.project-card:hover .card-arrow, .tool-card:hover .card-arrow {
  color: var(--4s-primary);
  transform: translateX(3px);
}

.detail-header {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--4s-gap-md);
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--4s-text-muted);
  font-size: var(--4s-text-sm);
}

.breadcrumb strong { color: var(--4s-text); }

.detail-links a, .back-link, .gh-link {
  color: var(--4s-text-muted);
  font-size: var(--4s-text-sm);
  text-decoration: none;
}

.detail-links a:hover, .back-link:hover, .gh-link:hover {
  color: var(--4s-text);
}

.project-command-row {
  margin-top: calc(var(--4s-gap-sm) * -1);
}

.project-detail-main .hero-card {
  overflow: hidden;
  border-color: var(--4s-panel-glass-border);
  background:
    linear-gradient(var(--4s-panel-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--4s-panel-grid-line) 1px, transparent 1px),
    radial-gradient(circle at 12% 8%, var(--4s-panel-glass-sheen), transparent 30%),
    radial-gradient(circle at 92% 20%, var(--4s-tool-optic), transparent 24%),
    var(--4s-panel-glass-bg);
  background-size: 30px 30px, 30px 30px, auto, auto, auto;
  box-shadow: var(--4s-panel-shadow);
  backdrop-filter: blur(14px) saturate(1.14);
  -webkit-backdrop-filter: blur(14px) saturate(1.14);
}

.project-detail-main .hero-card > * {
  position: relative;
  z-index: 1;
}

.project-detail-main .hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 0 18%, var(--4s-panel-grid-accent) 18% 18.15%, transparent 18.15%),
    linear-gradient(180deg, var(--4s-primary), transparent 22%) left top / 1px 100% no-repeat;
  opacity: 0.52;
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--4s-gap-xl);
  margin-bottom: var(--4s-gap-lg);
}

.hero-copy {
  min-width: 260px;
  flex: 1;
}

.hero-copy h2, .hero-copy h1 {
  margin: var(--4s-gap-sm) 0;
  color: var(--4s-text);
  font-size: var(--4s-text-xl);
  line-height: 1.35;
}

.hero-copy p, .panel p, .highlight-card p {
  margin: 0;
  color: var(--4s-text-muted);
  font-size: var(--4s-text-sm);
  line-height: 1.7;
}

.hero-copy p + p, .panel p + p { margin-top: var(--4s-gap-sm); }

.hero-status {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.project-schematic {
  position: relative;
  flex: 0 0 184px;
  width: 184px;
  height: 116px;
  border: 1px solid var(--4s-panel-glass-border);
  border-radius: var(--4s-radius-sm);
  background:
    linear-gradient(var(--4s-panel-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--4s-panel-grid-line) 1px, transparent 1px),
    color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 18%);
  background-size: 24px 24px, 24px 24px, auto;
  overflow: hidden;
  box-shadow: 0 1px 0 var(--4s-panel-glass-highlight) inset;
}

.project-schematic::before,
.project-schematic::after,
.project-schematic__scan,
.project-schematic__line,
.project-schematic__node {
  content: "";
  position: absolute;
  pointer-events: none;
}

.project-schematic::before {
  inset: 16px 18px;
  border: 1px solid var(--4s-panel-glass-border-strong);
  opacity: 0.56;
}

.project-schematic::after {
  left: 18px;
  right: 18px;
  bottom: 19px;
  height: 1px;
  background: linear-gradient(90deg, var(--4s-primary), transparent 40%, var(--4s-tool-optic-strong));
}

.project-schematic__node {
  width: 9px;
  height: 9px;
  border-radius: var(--4s-radius-full);
  background: var(--4s-primary);
  box-shadow: 0 0 0 4px var(--4s-primary-soft);
}

.project-schematic__node.node-a { left: 34px; top: 30px; }
.project-schematic__node.node-b { left: 92px; top: 58px; background: var(--4s-info); box-shadow: 0 0 0 4px var(--4s-info-soft); }
.project-schematic__node.node-c { right: 34px; top: 34px; }

.project-schematic__line {
  height: 1px;
  transform-origin: left center;
  background: linear-gradient(90deg, var(--4s-primary), var(--4s-tool-optic));
  opacity: 0.58;
}

.project-schematic__line.line-a {
  left: 42px;
  top: 36px;
  width: 72px;
  transform: rotate(25deg);
}

.project-schematic__line.line-b {
  left: 99px;
  top: 63px;
  width: 62px;
  transform: rotate(-24deg);
}

.project-schematic__scan {
  left: 0;
  top: 0;
  width: 42%;
  height: 100%;
  background: linear-gradient(90deg, transparent, var(--4s-panel-glass-highlight), transparent);
  opacity: 0.42;
  transform: translateX(-120%);
  animation: project-schematic-scan 5.8s linear infinite;
}

@keyframes project-schematic-scan {
  0%, 48% { transform: translateX(-120%); }
  70%, 100% { transform: translateX(240%); }
}

.meta-card {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--4s-gap-sm) var(--4s-gap-md);
  background: var(--4s-surface-strong);
  border-color: transparent;
}

.meta-card span {
  color: var(--4s-text-muted);
  font-size: var(--4s-text-xs);
}

.meta-card strong {
  color: var(--4s-text);
  font-size: var(--4s-text-base);
  overflow-wrap: anywhere;
}

.meta-card small {
  color: var(--4s-text-quiet);
  font-family: var(--4s-font-mono);
  font-size: 10px;
}

.project-detail-main .meta-card,
.project-detail-main .panel,
.project-detail-main .highlight-card {
  border-color: var(--4s-panel-glass-border);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 40%),
    color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 18%);
  box-shadow: 0 1px 0 var(--4s-panel-glass-highlight) inset;
  backdrop-filter: blur(12px) saturate(1.1);
  -webkit-backdrop-filter: blur(12px) saturate(1.1);
}

.detail-kv {
  display: grid;
  gap: 0;
  margin-top: var(--4s-gap-md);
  border-top: 1px solid var(--4s-panel-glass-border);
}

.detail-kv div {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: var(--4s-gap-sm);
  align-items: center;
  min-height: 34px;
  border-bottom: 1px solid var(--4s-border-soft);
  font-family: var(--4s-font-mono);
  font-size: var(--4s-text-xs);
}

.detail-kv span {
  color: var(--4s-primary);
  font-weight: 700;
}

.detail-kv strong {
  color: var(--4s-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.project-capability-panel .check-list {
  gap: 6px;
}

.project-capability-panel .check-list li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: var(--4s-gap-sm);
  align-items: start;
  min-height: 34px;
  padding: 7px 9px;
  border: 1px solid var(--4s-panel-glass-border);
  border-radius: var(--4s-radius-sm);
  background: color-mix(in srgb, var(--4s-panel-glass-bg), transparent 18%);
}

.project-capability-panel .check-list li::before {
  content: none;
}

.project-capability-panel .check-list li span {
  color: var(--4s-primary);
  font-family: var(--4s-font-mono);
  font-size: var(--4s-text-xs);
  font-weight: 700;
}

.project-highlight-card {
  min-height: 142px;
}

.highlight-index {
  display: inline-flex;
  align-items: center;
  width: max-content;
  margin-bottom: var(--4s-gap-xs);
  color: var(--4s-primary);
  font-family: var(--4s-font-mono);
  font-size: var(--4s-text-xs);
  font-weight: 700;
}

.panel h2, .panel h3, .tool-layout > section h2, .highlight-card h3 {
  margin: 0 0 var(--4s-gap-sm);
  color: var(--4s-text);
  font-size: var(--4s-text-md);
  font-weight: 600;
}

.check-list, .panel ul {
  display: flex;
  flex-direction: column;
  gap: var(--4s-gap-sm);
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li, .panel li {
  position: relative;
  padding-left: var(--4s-gap-md);
  color: var(--4s-text);
  font-size: var(--4s-text-sm);
  line-height: 1.6;
}

.check-list li::before, .panel li::before {
  content: "▸";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--4s-primary);
  font-family: var(--4s-font-mono);
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn, button { cursor: pointer; }

.btn {
  min-height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0 16px;
  border: 1px solid var(--4s-border);
  border-radius: var(--4s-radius-md);
  background: var(--4s-surface);
  color: var(--4s-text);
  font-size: var(--4s-text-base);
  font-weight: 500;
  text-decoration: none;
  transition: background var(--4s-transition-fast), border-color var(--4s-transition-fast), color var(--4s-transition-fast);
}

.btn:hover {
  background: var(--4s-surface-elevated);
  border-color: var(--4s-border-strong);
}

.btn.primary {
  border-color: var(--4s-primary);
  background: var(--4s-primary);
  color: #fff;
}

.btn.primary:hover { background: var(--4s-primary-deep); border-color: var(--4s-primary-deep); }

.btn.warn {
  border-color: transparent;
  background: var(--4s-warn-soft);
  color: var(--4s-warn);
}

/* ==========================================================================
   Notices
   ========================================================================== */
.notice {
  padding: 12px 14px;
  border-radius: var(--4s-radius-card);
  border: 1px solid var(--4s-warn-soft);
  background: var(--4s-warn-soft);
  color: var(--4s-warn);
}

.notice.error {
  color: var(--4s-danger);
  border-color: var(--4s-danger-soft);
  background: var(--4s-danger-soft);
}

.notice.success {
  color: var(--4s-success);
  border-color: var(--4s-success-soft);
  background: var(--4s-success-soft);
}

/* ==========================================================================
   Form fields / Stats / Preview stage（工具页用）
   ========================================================================== */
.field {
  display: grid;
  gap: var(--4s-gap-sm);
  margin-bottom: var(--4s-gap-md);
}
.field:last-child { margin-bottom: 0; }
.field label {
  color: var(--4s-text);
  font-size: var(--4s-text-sm);
  font-weight: 500;
}
.field-hint, .small-note, .stat-label, .footer-note {
  color: var(--4s-text-muted);
  font-size: var(--4s-text-xs);
}

.inline-fields {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--4s-gap-md);
}

.preview-shell { display: grid; gap: var(--4s-gap-md); }
.preview-stage {
  min-height: 320px;
  display: grid;
  place-items: center;
  padding: var(--4s-gap-md);
  border: 1px solid var(--4s-border);
  border-radius: var(--4s-radius-card);
  background: var(--4s-surface-strong);
}
.preview-stage canvas {
  max-width: 100%;
  height: auto;
  border-radius: var(--4s-radius-md);
  background: #fff;
}

.stats-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.stat { padding: var(--4s-gap-md); background: var(--4s-surface-strong); }
.stat-value {
  margin-top: 4px;
  color: var(--4s-text);
  font-family: var(--4s-font-mono);
  font-size: var(--4s-text-xl);
  font-weight: 700;
}

/* ==========================================================================
   Code blocks
   ========================================================================== */
.mono, code {
  font-family: var(--4s-font-mono);
}

code {
  padding: 2px 6px;
  border: 1px solid var(--4s-border-soft);
  border-radius: var(--4s-radius-sm);
  background: var(--4s-token-bg);
  color: var(--4s-primary-ink);
  font-size: 0.92em;
}

/* ==========================================================================
   Mode tabs / Footer
   ========================================================================== */
.mode-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: var(--4s-gap-md);
}

.mode-tab {
  flex: 1;
  min-height: 36px;
  border: 1px solid var(--4s-border);
  border-radius: var(--4s-radius-md);
  background: transparent;
  color: var(--4s-text-muted);
  font-size: var(--4s-text-sm);
}

.mode-tab.active {
  border-color: var(--4s-primary);
  background: var(--4s-primary-soft);
  color: var(--4s-primary);
}

.site-footer {
  position: relative;
  margin-top: var(--4s-gap-2xl);
  padding: var(--4s-gap-lg) 0;
  border-top: 1px solid var(--4s-border);
  color: var(--4s-text-muted);
  font-size: var(--4s-text-xs);
  text-align: center;
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -1px;
  width: min(320px, 62vw);
  height: 1px;
  transform: translateX(-50%);
  background: linear-gradient(90deg, transparent, var(--4s-primary), transparent 72%, var(--4s-panel-glass-caustic), transparent);
  opacity: 0.72;
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--4s-gap-md);
  min-width: 0;
  padding: 0 var(--4s-gap-md);
}

.site-footer a {
  color: var(--4s-text-muted);
  text-decoration: none;
  overflow-wrap: anywhere;
}
.site-footer a:hover { color: var(--4s-text); }

.beian-psb {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 100%;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .site-header, .shell-header, .page-header, .hero-top {
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: flex-start;
  }

  .site-nav, .shell-links { grid-column: 1 / -1; }

  .page-header, .hero-top { flex-direction: column; }

  .projects-grid, .panel-grid, .tool-layout, .highlight-grid { grid-template-columns: 1fr; }
  .meta-grid, .overview-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .project-schematic { display: none; }
}

/* ==========================================================================
   CRT Phosphor Utilities
   ========================================================================== */

::selection {
  background: rgba(16, 185, 129, 0.25);
  color: #0d1110;
  text-shadow: 0 0 3px rgba(16, 185, 129, 0.45);
}

[data-theme="dark"] ::selection {
  background: rgba(16, 185, 129, 0.30);
  color: #e6e8e6;
  text-shadow: 0 0 3px rgba(16, 185, 129, 0.50);
}

.crt {
  font-family: var(--4s-font-mono);
  transition: text-shadow 120ms linear;
}

.crt:hover {
  text-shadow: 0 0 6px rgba(16, 185, 129, 0.45);
}

[data-theme="dark"] .crt:hover {
  text-shadow: 0 0 6px rgba(16, 185, 129, 0.50);
}

.console-panel {
  position: relative;
  overflow: hidden;
}

.console-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 10;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(16, 185, 129, 0.03) 2px,
    rgba(16, 185, 129, 0.03) 3px
  );
}

[data-theme="dark"] .console-panel::after {
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(16, 185, 129, 0.05) 2px,
    rgba(16, 185, 129, 0.05) 3px
  );
}

@keyframes phosphor-afterglow {
  0%   { text-shadow: 0 0 8px rgba(16, 185, 129, 0.45); opacity: 0.7; }
  60%  { text-shadow: 0 0 3px rgba(16, 185, 129, 0.45); opacity: 1; }
  100% { text-shadow: none;                                 opacity: 1; }
}

@media (max-width: 560px) {
  .site-shell, .tool-shell, .project-shell {
    width: min(100vw - 24px, var(--4s-content-max-width));
    padding-top: var(--4s-gap-md);
  }

  .site-header, .shell-header {
    grid-template-columns: 1fr auto;
    padding: var(--4s-gap-md) 0;
  }

  .site-brand { display: none; }

  .site-nav a, .shell-link {
    min-height: 34px;
    padding: 0 10px;
  }

  .detail-links {
    width: 100%;
    justify-content: flex-start;
  }

  .hero-copy {
    min-width: 0;
  }

  .hero-copy h1,
  .hero-copy h2 {
    overflow-wrap: anywhere;
  }

  .overview-card, .hero-card, .panel, .tool-layout > section { padding: var(--4s-gap-md); }
  .tools-grid, .tool-grid { grid-template-columns: 1fr; }
  .inline-fields, .stats-grid, .meta-grid, .overview-grid { grid-template-columns: 1fr; }

  .tool-shell .mode-tabs,
  .tool-shell .tab-bar {
    display: grid;
    grid-template-columns: 1fr;
  }

  .tool-shell .mode-tab,
  .tool-shell .tab-btn {
    width: 100%;
    min-width: 0;
    white-space: normal;
  }
}

/* ==========================================================================
   Static Tool Optical Pass
   ========================================================================== */
body {
  background:
    linear-gradient(118deg, var(--4s-panel-glass-sheen), transparent 28%),
    linear-gradient(250deg, transparent 18%, var(--4s-panel-glass-caustic) 46%, transparent 68%),
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 31px,
      var(--4s-panel-grid-line) 31px,
      var(--4s-panel-grid-line) 32px
    ),
    repeating-linear-gradient(
      0deg,
      transparent 0,
      transparent 31px,
      var(--4s-panel-grid-line) 31px,
      var(--4s-panel-grid-line) 32px
    ),
    var(--4s-bg);
}

.is-tool-embed body { background: transparent; }

.tool-shell {
  position: relative;
  isolation: isolate;
}

.tool-shell::before {
  content: "";
  position: absolute;
  inset: 8px -18px -28px;
  z-index: 0;
  pointer-events: none;
  opacity: 0.72;
  background:
    linear-gradient(105deg, transparent 0 18%, var(--4s-tool-grid-accent) 18% 19%, transparent 19% 52%, var(--4s-panel-grid-line) 52% 53%, transparent 53%),
    linear-gradient(12deg, transparent 0 42%, var(--4s-panel-glass-sheen) 42% 43%, transparent 43%),
    repeating-linear-gradient(
      135deg,
      transparent 0,
      transparent 23px,
      var(--4s-panel-grid-line) 23px,
      var(--4s-panel-grid-line) 24px
    );
  mask-image: linear-gradient(180deg, transparent, #000 9%, #000 86%, transparent);
}

.is-tool-embed .tool-shell::before {
  inset: -12px;
  opacity: 0.58;
}

.tool-shell > * {
  position: relative;
  z-index: 1;
}

.tool-shell .shell-header {
  overflow: hidden;
  border: 1px solid var(--4s-panel-glass-border);
  border-radius: var(--4s-radius-card);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 35%),
    linear-gradient(90deg, transparent, var(--4s-panel-glass-sheen), transparent),
    var(--4s-panel-glass-bg);
  box-shadow: var(--4s-panel-shadow);
  backdrop-filter: blur(14px) saturate(1.12);
}

.tool-shell .shell-header::before {
  content: "";
  position: absolute;
  right: var(--4s-gap-md);
  top: var(--4s-gap-md);
  width: min(168px, 28vw);
  height: 58px;
  pointer-events: none;
  opacity: 0.50;
  background:
    linear-gradient(90deg, var(--4s-tool-optic), transparent 72%) 0 8px / 100% 1px no-repeat,
    linear-gradient(90deg, transparent, var(--4s-panel-glass-border-strong), transparent) 18px 28px / 78% 1px no-repeat,
    linear-gradient(90deg, var(--4s-primary-soft), transparent 62%) 44px 48px / 58% 1px no-repeat,
    linear-gradient(var(--4s-panel-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--4s-panel-grid-line) 1px, transparent 1px);
  background-size: 100% 1px, 78% 1px, 58% 1px, 18px 18px, 18px 18px;
  mask-image: linear-gradient(90deg, transparent, #000 18%, #000 82%, transparent);
}

.tool-shell .shell-header::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--4s-tool-optic), transparent);
  pointer-events: none;
}

.tool-shell .shell-link,
.tool-shell .theme-toggle {
  border: 1px solid var(--4s-panel-glass-border);
  background: color-mix(in srgb, var(--4s-panel-glass-bg), transparent 16%);
  backdrop-filter: blur(10px);
}

.tool-shell .shell-link:hover,
.tool-shell .theme-toggle:hover {
  color: var(--4s-primary);
  border-color: var(--4s-panel-glass-border-strong);
  background:
    linear-gradient(90deg, transparent, var(--4s-panel-glass-sheen), transparent),
    var(--4s-panel-glass-bg-strong);
}

.tool-shell :is(.tool-layout > section, .panel, .overview-card, .hero-card, .meta-card, .stat) {
  overflow: hidden;
  border-color: var(--4s-panel-glass-border);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 34%),
    linear-gradient(90deg, transparent, var(--4s-panel-glass-sheen), transparent),
    var(--4s-panel-glass-bg);
  box-shadow: var(--4s-panel-shadow);
  backdrop-filter: blur(14px) saturate(1.12);
}

.tool-shell :is(.tool-layout > section, .panel, .overview-card, .hero-card, .meta-card, .stat)::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 24px,
      var(--4s-panel-grid-line) 24px,
      var(--4s-panel-grid-line) 25px
    ),
    linear-gradient(180deg, transparent 0, transparent 68%, var(--4s-tool-grid-accent) 100%);
  opacity: 0.42;
}

.tool-shell :is(.tool-layout > section, .panel, .overview-card, .hero-card, .meta-card, .stat)::after {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, var(--4s-tool-optic), transparent);
}

.tool-shell :is(.tool-layout > section, .panel, .overview-card, .hero-card, .meta-card, .stat):hover {
  border-color: var(--4s-panel-glass-border-strong);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 32%),
    linear-gradient(90deg, transparent, var(--4s-tool-optic-strong), transparent),
    var(--4s-panel-glass-bg-strong);
}

.tool-shell :is(.tool-layout > section, .panel) h2 {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.tool-shell :is(.tool-layout > section, .panel) h2::before {
  content: "";
  width: 10px;
  height: 10px;
  border: 1px solid var(--4s-primary);
  border-radius: 2px;
  background:
    linear-gradient(90deg, transparent 46%, var(--4s-primary) 46% 54%, transparent 54%),
    linear-gradient(0deg, transparent 46%, var(--4s-primary) 46% 54%, transparent 54%);
  opacity: 0.78;
}

.tool-shell :is(input:not([type]), input[type="text"], input[type="number"], input[type="password"], input[type="date"], input[type="datetime-local"], input[type="search"], input[type="file"], select, textarea) {
  border-color: var(--4s-panel-glass-border);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 42%),
    color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 14%);
  box-shadow: 0 1px 0 var(--4s-panel-glass-highlight) inset;
}

.tool-shell :is(input, select, textarea):focus {
  border-color: var(--4s-panel-glass-border-strong);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 38%),
    var(--4s-panel-glass-bg-strong);
  box-shadow:
    0 0 0 3px var(--4s-primary-soft),
    0 1px 0 var(--4s-panel-glass-highlight) inset;
}

.tool-shell textarea {
  resize: vertical;
}

.tool-shell input[type="range"] {
  width: 100%;
  accent-color: var(--4s-primary);
}

.tool-shell input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border: 1px solid var(--4s-panel-glass-border);
  border-radius: var(--4s-radius-full);
  background:
    linear-gradient(90deg, var(--4s-panel-glass-sheen), transparent),
    color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 26%);
}

.tool-shell input[type="range"]::-webkit-slider-thumb {
  margin-top: -6px;
}

.tool-shell :is(input[type="checkbox"], input[type="radio"]) {
  accent-color: var(--4s-primary);
}

.tool-shell .btn,
.tool-shell .copy-btn,
.tool-shell .mode-tab,
.tool-shell .tab-btn {
  border-color: var(--4s-panel-glass-border);
  border-radius: var(--4s-radius-btn);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 48%),
    color-mix(in srgb, var(--4s-panel-glass-bg), transparent 10%);
  color: var(--4s-text);
  box-shadow: 0 1px 0 var(--4s-panel-glass-highlight) inset;
  backdrop-filter: blur(10px);
}

.tool-shell :is(.btn, .copy-btn, .mode-tab, .tab-btn):hover {
  border-color: var(--4s-panel-glass-border-strong);
  color: var(--4s-primary);
  background:
    linear-gradient(90deg, transparent, var(--4s-panel-glass-sheen), transparent),
    var(--4s-panel-glass-bg-strong);
}

.tool-shell .btn.primary,
.tool-shell .mode-tab.active,
.tool-shell .tab-btn.active {
  border-color: var(--4s-panel-glass-border-strong);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.24), transparent 42%),
    linear-gradient(90deg, var(--4s-primary), color-mix(in srgb, var(--4s-primary), var(--4s-accent) 22%));
  color: #fff;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.28) inset,
    0 0 0 1px var(--4s-primary-soft);
}

.tool-shell .btn.warn {
  border-color: color-mix(in srgb, var(--4s-warn), transparent 48%);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.20), transparent 42%),
    var(--4s-warn-soft);
  color: var(--4s-warn);
}

.tool-shell :is(.btn, .copy-btn, .mode-tab, .tab-btn):disabled,
.tool-shell :is(.btn, .copy-btn, .mode-tab, .tab-btn)[aria-disabled="true"] {
  opacity: 0.46;
  cursor: not-allowed;
  filter: grayscale(0.25);
}

.tool-shell .tab-btn:first-child {
  border-radius: var(--4s-radius-btn) 0 0 var(--4s-radius-btn);
}

.tool-shell .tab-btn:last-child {
  border-radius: 0 var(--4s-radius-btn) var(--4s-radius-btn) 0;
}

.tool-shell :is(.preview-stage, .preview-pane, .drop-zone, .tree-output, .fmt-output, .hl-output, .replace-out, .match-wrap) {
  position: relative;
  overflow: auto;
  border-color: var(--4s-panel-glass-border);
  border-radius: var(--4s-radius-card);
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 28px,
      var(--4s-panel-grid-line) 28px,
      var(--4s-panel-grid-line) 29px
    ),
    linear-gradient(180deg, var(--4s-panel-glass-highlight), transparent 32%),
    color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 12%);
  box-shadow:
    0 1px 0 var(--4s-panel-glass-highlight) inset,
    0 0 0 1px var(--4s-border-soft);
  backdrop-filter: blur(12px) saturate(1.08);
}

.tool-shell :is(.preview-stage, .preview-pane, .drop-zone, .tree-output, .fmt-output, .hl-output, .replace-out, .match-wrap)::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, transparent 0 22%, var(--4s-tool-grid-accent) 22% 22.4%, transparent 22.4%),
    linear-gradient(180deg, transparent 0 72%, var(--4s-panel-glass-sheen) 72% 72.3%, transparent 72.3%);
  opacity: 0.42;
}

.tool-shell :is(.preview-stage, .preview-pane, .drop-zone, .tree-output, .fmt-output, .hl-output, .replace-out)::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, var(--4s-tool-optic), transparent);
}

.tool-shell .preview-stage {
  overflow: hidden;
  min-height: 320px;
}

.tool-shell .preview-stage canvas {
  border: 1px solid var(--4s-panel-glass-border);
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.08);
}

.tool-shell .drop-zone {
  border-style: dashed;
  color: var(--4s-text-muted);
}

.tool-shell .drop-zone:is(.dragover, .drag-over),
.tool-shell .drop-zone.has-file {
  border-color: var(--4s-panel-glass-border-strong);
  color: var(--4s-primary);
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 28px,
      var(--4s-panel-grid-line) 28px,
      var(--4s-panel-grid-line) 29px
    ),
    var(--4s-primary-soft);
}

.tool-shell :is(.result-row, .hash-row) {
  border-color: var(--4s-panel-glass-border);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 45%),
    color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 18%);
  box-shadow: 0 1px 0 var(--4s-panel-glass-highlight) inset;
}

.tool-shell :is(.result-row, .hash-row):hover {
  border-color: var(--4s-panel-glass-border-strong);
  background:
    linear-gradient(90deg, transparent, var(--4s-panel-glass-sheen), transparent),
    var(--4s-panel-glass-bg-strong);
}

.tool-shell :is(.hash-val, .result-value, .tree-output .line-dir, .jk, .file-name) {
  color: var(--4s-primary-ink);
}

.tool-shell :is(.algo-label, .flag-label, .inline-check) {
  min-height: 30px;
  padding: 4px 8px;
  border: 1px solid var(--4s-panel-glass-border);
  border-radius: var(--4s-radius-sm);
  background: color-mix(in srgb, var(--4s-panel-glass-bg), transparent 18%);
}

.tool-shell .algo-list,
.tool-shell .flags {
  gap: 8px;
}

.tool-shell :is(.tag, .info-tag, .muted-tag, .status-pill, .pill) {
  border-radius: var(--4s-radius-sm);
  border: 1px solid var(--4s-panel-glass-border);
  background: color-mix(in srgb, var(--4s-panel-glass-bg), transparent 10%);
}

.tool-shell .notice {
  border-color: var(--4s-panel-glass-border);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 42%),
    color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 18%);
  box-shadow: 0 1px 0 var(--4s-panel-glass-highlight) inset;
}

.tool-shell .notice.error {
  border-color: var(--4s-danger-soft);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.18), transparent 42%),
    var(--4s-danger-soft);
}

.tool-shell .notice.success {
  border-color: var(--4s-panel-glass-border-strong);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 42%),
    var(--4s-primary-soft);
}

.tool-shell .preview-pane :is(pre, code),
.tool-shell .match-table td code {
  background: color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 18%);
}

.tool-shell :is(.panel p, .tool-layout > section p, code) {
  overflow-wrap: anywhere;
}

.tool-shell .preview-pane pre {
  border: 1px solid var(--4s-panel-glass-border);
}

.tool-shell .preview-pane blockquote {
  border-left-color: var(--4s-primary);
  background: color-mix(in srgb, var(--4s-panel-glass-bg), transparent 28%);
}

.tool-shell .match-table th {
  background: color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 12%);
}

.tool-shell .hl-output mark {
  background: color-mix(in srgb, var(--4s-primary), transparent 72%);
  color: var(--4s-text);
  box-shadow: 0 0 0 1px var(--4s-panel-glass-border);
}

/* ==========================================================================
   Static Tool State Feedback
   ========================================================================== */
.tool-shell[data-tool-state="busy"]::before {
  opacity: 0.76;
  animation: tool-field-drift 900ms linear infinite;
}

.tool-shell[data-tool-state="ready"] :is(.preview-stage, .preview-pane, .tree-output, .hash-rows, .stats-grid) {
  --4s-tool-state-color: var(--4s-primary);
}

.tool-shell[data-tool-state="error"] :is(.preview-stage, .preview-pane, .tree-output, .hash-rows, .stats-grid) {
  --4s-tool-state-color: var(--4s-danger);
}

.tool-shell :is(.preview-stage, .preview-pane, .tree-output, .hash-rows, .stats-grid).is-processing,
.tool-shell .btn.is-processing {
  border-color: var(--4s-panel-glass-border-strong);
  background:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 18px,
      color-mix(in srgb, var(--4s-primary), transparent 82%) 18px,
      color-mix(in srgb, var(--4s-primary), transparent 82%) 20px
    ),
    linear-gradient(90deg, transparent, var(--4s-panel-glass-sheen), transparent),
    color-mix(in srgb, var(--4s-panel-glass-bg-strong), transparent 10%);
  background-size: 42px 100%, 100% 100%, 100% 100%;
  animation: tool-progress-stripe 720ms linear infinite;
}

.tool-shell .btn.is-processing {
  color: var(--4s-primary);
}

.tool-shell .is-updated {
  animation: tool-afterglow 760ms linear 1;
}

.tool-shell .is-state-success {
  border-color: var(--4s-panel-glass-border-strong);
  background:
    linear-gradient(135deg, var(--4s-panel-glass-highlight), transparent 42%),
    var(--4s-primary-soft);
}

.tool-shell .is-state-warning {
  border-color: color-mix(in srgb, var(--4s-warn), transparent 44%);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.20), transparent 42%),
    var(--4s-warn-soft);
}

.tool-shell .is-state-error {
  border-color: color-mix(in srgb, var(--4s-danger), transparent 42%);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.18), transparent 42%),
    var(--4s-danger-soft);
}

.tool-shell .state-spark {
  position: relative;
}

.tool-shell .state-spark::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(90deg, transparent, var(--4s-tool-optic-strong), transparent);
  opacity: 0;
  transform: translateX(-34%);
}

.tool-shell .state-spark.is-updated::after {
  animation: tool-caustic-sweep 700ms linear 1;
}

@keyframes tool-progress-stripe {
  from { background-position: 0 0, 0 0, 0 0; }
  to   { background-position: 42px 0, 0 0, 0 0; }
}

@keyframes tool-field-drift {
  from { background-position: 0 0, 0 0, 0 0; }
  to   { background-position: 24px 0, 12px 0, 34px 0; }
}

@keyframes tool-afterglow {
  0% {
    border-color: var(--4s-panel-glass-border-strong);
    box-shadow:
      0 0 0 1px var(--4s-primary-soft),
      0 0 18px color-mix(in srgb, var(--4s-primary), transparent 72%),
      0 1px 0 var(--4s-panel-glass-highlight) inset;
  }
  70% {
    border-color: var(--4s-panel-glass-border-strong);
    box-shadow:
      0 0 0 1px var(--4s-primary-soft),
      0 0 8px color-mix(in srgb, var(--4s-primary), transparent 84%),
      0 1px 0 var(--4s-panel-glass-highlight) inset;
  }
  100% {
    box-shadow:
      0 1px 0 var(--4s-panel-glass-highlight) inset,
      0 0 0 1px var(--4s-border-soft);
  }
}

@keyframes tool-caustic-sweep {
  0%   { opacity: 0; transform: translateX(-38%); }
  18%  { opacity: 0.72; }
  78%  { opacity: 0.30; }
  100% { opacity: 0; transform: translateX(38%); }
}

@media (prefers-reduced-motion: reduce) {
  .project-schematic__scan,
  .tool-shell[data-tool-state="busy"]::before,
  .tool-shell :is(.preview-stage, .preview-pane, .tree-output, .hash-rows, .stats-grid).is-processing,
  .tool-shell .btn.is-processing,
  .tool-shell .is-updated,
  .tool-shell .state-spark.is-updated::after {
    animation: none;
  }
}

@media (max-width: 720px) {
  .tool-shell::before {
    inset: 0 -8px -20px;
    opacity: 0.42;
  }

  .tool-shell .tool-actions {
    align-items: stretch;
  }

  .tool-shell .tool-actions .btn {
    flex: 1 1 140px;
  }

  .tool-shell .mode-tabs,
  .tool-shell .tab-bar {
    flex-wrap: wrap;
  }

  .tool-shell .mode-tab,
  .tool-shell .tab-btn {
    flex: 1 1 118px;
  }

  .tool-shell :is(.result-row, .hash-row) {
    flex-wrap: wrap;
  }

  .tool-shell :is(.result-label, .hash-algo) {
    min-width: 72px;
  }

  .tool-shell .copy-btn {
    margin-left: auto;
  }
}