:root {
  --bg: #0b1526;
  --panel: #111c2f;
  --panel-strong: #0d1727;
  --text: #e8eef9;
  --muted: #94a3b8;
  --primary: #38bdf8;
  --secondary: #f97316;
  --accent: #22c55e;
  --border: rgba(255, 255, 255, 0.06);
  --card: rgba(255, 255, 255, 0.02);
  --shadow: 0 25px 80px rgba(0, 0, 0, 0.35);
  --radius: 16px;
  --pill-radius: 999px;
  --font: 'Space Grotesk', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 20% 20%, rgba(56, 189, 248, 0.1), transparent 30%),
              radial-gradient(circle at 80% 0%, rgba(249, 115, 22, 0.18), transparent 28%),
              radial-gradient(circle at 70% 60%, rgba(34, 197, 94, 0.12), transparent 30%),
              var(--bg);
  color: var(--text);
  font-family: var(--font);
}

.page {
  max-width: 1320px;
  margin: 0 auto;
  padding: 32px 22px 48px;
}

h1, h2, h3 {
  margin: 0 0 6px;
  letter-spacing: -0.03em;
}

p {
  margin: 0;
}

.hero {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  padding: 28px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 6px;
}

.lede {
  color: var(--muted);
  line-height: 1.7;
  max-width: 720px;
}

.meta-notes {
  display: flex;
  gap: 18px;
  margin: 6px 0 12px;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #7dd3fc;
  font-weight: 700;
  font-family: 'Space Grotesk', 'Segoe UI', system-ui, -apple-system, sans-serif;
  text-shadow: 0 0 12px rgba(125, 211, 252, 0.4);
}

.meta-notes span {
  padding: 4px 8px;
  border-radius: 10px;
  background: rgba(125, 211, 252, 0.08);
  border: 1px solid rgba(125, 211, 252, 0.35);
}

.hero-actions {
  margin-top: 18px;
  display: flex;
  gap: 10px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(120px, 1fr));
  gap: 12px;
  align-self: center;
}

.stat-card {
  padding: 16px 18px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--border);
  text-align: center;
}

.stat-card .label {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.stat-card .value {
  margin-top: 6px;
  font-size: 32px;
  font-weight: 700;
}

.filters {
  margin-top: 24px;
  padding: 18px;
  border-radius: var(--radius);
  background: var(--panel);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.filter-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  align-items: start;
}

.filter-block {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 12px;
}

.filter-title {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 8px;
}

#searchInput {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 15px;
}

#searchInput::placeholder {
  color: rgba(232, 238, 249, 0.6);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pill {
  padding: 8px 12px;
  border-radius: var(--pill-radius);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.15s ease;
}

.pill.active {
  background: var(--primary);
  color: #051526;
  border-color: rgba(255,255,255,0.1);
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.35);
}

.pill.level-beginner { --pill-color: #fe4c61; } /* 入门 */
.pill.level-regular { --pill-color: #ffc116; }  /* 普及 */
.pill.level-advanced { --pill-color: #3498db; } /* 提高 */
.pill.level-province { --pill-color: #9c3dcf; } /* 省�?*/
.pill.level-noi { --pill-color: #0e1d69; }      /* NOI */
.pill.level-ioi { --pill-color: #0e1d69; }
.pill.level-neutral { --pill-color: rgba(255,255,255,0.2); }

.pill.level-beginner.active,
.pill.level-regular.active,
.pill.level-advanced.active,
.pill.level-province.active,
.pill.level-noi.active,
.pill.level-ioi.active,
.pill.level-neutral.active {
  background: var(--pill-color);
  box-shadow: 0 8px 22px color-mix(in srgb, var(--pill-color) 50%, transparent);
}

.layout {
  margin-top: 24px;
  display: block;
}

.panel {
  background: var(--panel-strong);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 18px;
  min-height: 300px;
}

.panel.side {
  position: sticky;
  top: 18px;
  align-self: start;
}

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.controls-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.left-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.right-controls {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
}

.toggle-row {
  display: flex;
  gap: 12px;
  align-items: center;
}

.head-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: flex-end;
}

.mode-switch {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.mode-btn {
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: #0b1526;
  padding: 8px 12px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 700;
  box-shadow: 0 8px 18px rgba(0,0,0,0.2);
}

.mode-btn[data-mode="levels"] {
  background: linear-gradient(120deg, #7dd3fc, #34d399);
}
.mode-btn[data-mode="category"] {
  background: linear-gradient(120deg, #c084fc, #60a5fa);
}

.mode-btn.active {
  box-shadow: 0 12px 26px rgba(0,0,0,0.25);
  border: none;
}

.panel-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(140px, 1fr));
  gap: 10px;
}

.panel-actions.grid-six {
  grid-template-columns: repeat(3, minmax(140px, 1fr));
  grid-auto-rows: auto;
}

.right-controls .btn {
  min-width: 140px;
}

/* 右侧按钮配色与主风格统一，增强渐变对�?*/
.right-controls .btn { color: #0b1526; box-shadow: 0 12px 28px rgba(0,0,0,0.24); border: none; }
.right-controls #showSelected { background: linear-gradient(130deg, #34d399, #22d3ee); }          /* 青绿→亮�?*/
.right-controls #showUnselected { background: linear-gradient(130deg, #60a5fa, #818cf8); }        /* 天蓝→靛�?*/
.right-controls #selectAllVisible { background: linear-gradient(130deg, #fbbf24, #f97316); }      /* 金黄→橙 */
.right-controls #invertVisible { background: linear-gradient(130deg, #f472b6, #c084fc); }         /* 玫红→紫 */
.right-controls #resetSelections { background: linear-gradient(130deg, #22c55e, #0f9f4f); }       /* 亮绿→深�?*/
.right-controls #resetFilters { background: linear-gradient(130deg, #cbd5e1, #475569); color: #0b1526; } /* 浅灰蓝→深灰�?*/

.mode-exports {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 8px 0 12px;
}

.mode-exports button[data-mode-export="png"] {
  background: linear-gradient(120deg, #34d399, #22d3ee);
  color: #0b1526;
  box-shadow: 0 10px 22px rgba(0,0,0,0.2);
  border: none;
}

.mode-exports button[data-mode-export="pdf"] {
  background: linear-gradient(120deg, #a78bfa, #60a5fa);
  color: #0b1526;
  box-shadow: 0 10px 22px rgba(0,0,0,0.2);
  border: none;
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

.checkbox input {
  width: 14px;
  height: 14px;
}

.algo-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 12px;
}

.algo-list.level-mode {
  display: block;
}

.algo-card {
  padding: 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--card);
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  position: relative;
}

.algo-card:hover {
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.12);
}

.algo-card.selected {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.16), rgba(34, 197, 94, 0.08));
  border-color: rgba(56, 189, 248, 0.6);
}

.algo-card .title {
  font-weight: 700;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  gap: 6px;
}

.algo-card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  padding: 4px 8px;
  border-radius: 10px;
  font-size: 12px;
  color: #0d1623;
  font-weight: 600;
}

.tag.level-beginner { background: #fe4c61; }
.tag.level-regular { background: #ffc116; color: #0d1623; }
.tag.level-advanced { background: #3498db; }
.tag.level-province { background: #9c3dcf; }
.tag.level-noi { background: #0e1d69; color: #e8eef9; }
.tag.level-ioi { background: #0e1d69; color: #e8eef9; }
.tag.level-neutral { background: rgba(255,255,255,0.08); color: var(--text); }
.tag.category { background: rgba(255,255,255,0.08); color: var(--text); border: 1px solid var(--border); }
.tag.group { background: rgba(249, 115, 22, 0.14); color: #f2c193; border: 1px solid rgba(249, 115, 22, 0.35); }
.tag.label { background: rgba(255,255,255,0.06); color: var(--text); }
.tag.highlight { outline: 1px solid rgba(255,255,255,0.5); box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.25); }

.algo-card .state {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.35);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  color: var(--text);
}

.algo-card.selected .state {
  background: #020617;
  color: #38bdf8;
  border-color: #38bdf8;
}

.export-board {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
}

.export-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.export-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.export-column {
  min-height: 180px;
  border: 1px dashed rgba(255,255,255,0.18);
  border-radius: 12px;
  padding: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.export-title {
  margin-bottom: 6px;
  color: var(--muted);
}

.hint {
  color: var(--muted);
  font-size: 13px;
}

.export-actions {
  color: var(--muted);
  font-size: 13px;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 10px;
}

.top-actions {
  margin-bottom: 12px;
}

.btn {
  border: none;
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 14px;
  cursor: pointer;
  font-weight: 700;
  color: #0b1526;
  transition: transform 0.12s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}

.btn.primary {
  background: linear-gradient(120deg, #38bdf8, #22c55e);
  box-shadow: 0 12px 24px rgba(56, 189, 248, 0.28);
}

.btn.secondary {
  background: #f97316;
  color: #0d1623;
  box-shadow: 0 12px 24px rgba(249, 115, 22, 0.28);
}

.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn.pdf {
  background: linear-gradient(120deg, #8b5cf6, #0ea5e9);
  color: #0b1526;
  box-shadow: 0 12px 24px rgba(139, 92, 246, 0.32);
  border: none;
}

.btn:hover {
  transform: translateY(-1px);
  opacity: 0.95;
}

.btn:active {
  transform: translateY(0);
}

.export-badge {
  padding: 6px 10px;
  border-radius: 10px;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 13px;
}
.export-badge.level-beginner { background: rgba(254, 76, 97, 0.18); color: #ffe7eb; border-color: rgba(254, 76, 97, 0.45); }
.export-badge.level-regular { background: rgba(255, 193, 22, 0.2); color: #2d1b00; border-color: rgba(255, 193, 22, 0.5); }
.export-badge.level-advanced { background: rgba(52, 152, 219, 0.2); color: #e7f4ff; border-color: rgba(52, 152, 219, 0.45); }
.export-badge.level-province { background: rgba(156, 61, 207, 0.22); color: #f7eaff; border-color: rgba(156, 61, 207, 0.5); }
.export-badge.level-noi { background: rgba(14, 29, 105, 0.22); color: #e8eef9; border-color: rgba(14, 29, 105, 0.6); }
.export-badge.level-ioi { background: rgba(14, 29, 105, 0.22); color: #e8eef9; border-color: rgba(14, 29, 105, 0.6); }
.export-badge.level-neutral { background: rgba(255,255,255,0.08); color: var(--text); border-color: var(--border); }
.export-badge.highlight { outline: 1px solid rgba(56, 189, 248, 0.5); box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.18); }

.summary-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 10px;
  color: var(--muted);
}

.category-block {
  grid-column: 1 / -1;
  margin-top: 6px;
}

.category-title {
  margin: 8px 0;
  font-weight: 700;
  color: var(--text);
}

.muted {
  color: var(--muted);
}

.empty {
  grid-column: 1 / -1;
  padding: 18px;
  border: 1px dashed var(--border);
  border-radius: 14px;
  color: var(--muted);
  text-align: center;
  background: rgba(255,255,255,0.02);
}

.hidden { display: none !important; }

.mindmap {
  margin-top: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  background: var(--card);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.02);
}

.mindmap-root {
  text-align: center;
  margin-bottom: 12px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: #9fd5ff;
}

.mindmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
}

.mindmap-category {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: rgba(255,255,255,0.03);
}

.mindmap-category .cat-title {
  font-weight: 800;
  color: var(--text);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.mindmap-group {
  border-left: 2px solid rgba(255,255,255,0.08);
  padding-left: 10px;
  margin-bottom: 8px;
}

.mindmap-group .group-title {
  color: var(--muted);
  font-weight: 700;
  margin-bottom: 6px;
}

.mindmap-node {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  padding: 6px 8px;
  border-radius: 10px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background 0.12s ease, border-color 0.12s ease;
}

.mindmap-node:hover {
  background: rgba(255,255,255,0.05);
  border-color: rgba(255,255,255,0.12);
}

.mindmap-node.selected {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.6);
}

.mindmap-node .name {
  font-weight: 700;
}

.level-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px;
  background: rgba(255,255,255,0.03);
  margin-bottom: 12px;
}

.level-block .level-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  margin-bottom: 10px;
}

.level-block .level-title .tag {
  font-size: 12px;
}

.level-cat-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.level-cat-row:first-of-type {
  border-top: none;
}

.level-cat-name {
  min-width: 110px;
  color: var(--muted);
  font-weight: 700;
}

.level-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.level-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease;
}

.level-item:hover {
  background: rgba(255,255,255,0.07);
}

.level-item.selected {
  background: rgba(56, 189, 248, 0.14);
  border-color: rgba(56, 189, 248, 0.6);
}

.level-item .algo-name {
  font-weight: 700;
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }
  .panel.side {
    position: static;
  }
  .hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page {
    padding: 20px 16px 36px;
  }
  .filters, .panel, .hero {
    padding: 14px;
  }
  .algo-list {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  }
}

.star-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 12px;
  margin: 6px 0 10px;
  background: linear-gradient(120deg, #fbbf24, #f97316);
  color: #0b1526;
  font-weight: 800;
  border-radius: 12px;
  text-decoration: none;
  box-shadow: 0 10px 22px rgba(0,0,0,0.2);
  border: none;
}

.star-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 26px rgba(0,0,0,0.25);
}