:root {
  --bg:        #0a0c0f;
  --bg-raised: #111418;
  --bg-card:   #161b22;
  --border:    #2a3040;
  --border-hi: #3d4f6e;
  --text:      #c8d0dc;
  --text-dim:  #5a6478;
  --text-mute: #3a4255;
  --accent:    #00e5a0;
  --accent-dim:#007a56;
  --accent-bg: #001a12;
  --warn:      #f0a500;
  --warn-bg:   #1a1000;
  --danger:    #e05555;
  --corp:      #4a9eff;
  --corp-bg:   #050f1f;
  --runner:    #c084fc;
  --runner-bg: #0e051a;
  --font-display: 'Syne', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;
  --radius:    6px;
  --radius-lg: 10px;
}

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

html { background: var(--bg); color: var(--text); font-family: var(--font-display); font-size: 15px; line-height: 1.6; -webkit-font-smoothing: antialiased; }

body { min-height: 100vh; position: relative; overflow-x: hidden; }

/* scanline overlay */
.scanline {
  position: fixed; inset: 0; pointer-events: none; z-index: 999;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 3px,
    rgba(0,0,0,0.06) 3px,
    rgba(0,0,0,0.06) 4px
  );
}

/* header */
header {
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 2rem;
  display: flex; align-items: baseline; gap: 1.5rem;
}
.logo {
  font-size: 1.2rem; font-weight: 800; letter-spacing: 0.08em;
  color: var(--text);
}
.logo-bracket { color: var(--text-dim); }
.logo-accent { color: var(--accent); }
.header-sub { font-size: 0.75rem; color: var(--text-dim); font-family: var(--font-mono); letter-spacing: 0.04em; }

/* main layout */
main { max-width: 860px; margin: 0 auto; padding: 2rem 1.5rem 4rem; display: flex; flex-direction: column; gap: 1.75rem; }

/* controls bar */
.controls-bar {
  display: flex; flex-wrap: wrap; gap: 1.5rem; align-items: flex-end;
  padding-bottom: 1.5rem; border-bottom: 1px solid var(--border);
}
.control-group { display: flex; flex-direction: column; gap: 6px; }
.ctrl-label { font-size: 0.7rem; font-family: var(--font-mono); color: var(--text-dim); letter-spacing: 0.08em; text-transform: uppercase; }

.toggle-group { display: flex; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.toggle-btn {
  padding: 6px 14px; font-family: var(--font-display); font-size: 0.8rem; font-weight: 500;
  background: transparent; color: var(--text-dim); border: none; cursor: pointer;
  border-right: 1px solid var(--border); transition: background 0.15s, color 0.15s;
}
.toggle-btn:last-child { border-right: none; }
.toggle-btn:hover { background: var(--bg-raised); color: var(--text); }
.toggle-btn.active { background: var(--bg-card); color: var(--accent); }

input[type=range] {
  -webkit-appearance: none; appearance: none;
  width: 120px; height: 4px; background: var(--border); border-radius: 2px; cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%;
  background: var(--accent); border: 2px solid var(--bg); cursor: pointer;
}

/* hand section */
.hand-section { display: flex; flex-direction: column; gap: 0.75rem; }

.hand-meta { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; }
#hand-status { font-size: 0.75rem; font-family: var(--font-mono); color: var(--text-dim); }
.hand-actions { display: flex; gap: 8px; }

.hand-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
  min-height: 180px;
}

.empty-hand {
  grid-column: 1 / -1;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px; color: var(--text-mute); font-size: 0.8rem; font-family: var(--font-mono);
  border: 1px dashed var(--border); border-radius: var(--radius-lg); padding: 2.5rem;
}
.empty-icon { font-size: 1.5rem; color: var(--border); }

/* card chips — portrait card layout */

.card-chip {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
  cursor: pointer; transition: border-color 0.15s, transform 0.15s, box-shadow 0.15s;
  display: flex; flex-direction: column;
  animation: fadeUp 0.2s ease both;
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.card-chip:hover {
  border-color: var(--border-hi);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}
.card-chip.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 8px 24px rgba(0,229,160,0.15);
}

/* artwork area */
.card-art {
  width: 100%; aspect-ratio: 4 / 3; overflow: hidden;
  background: var(--bg); position: relative; flex-shrink: 0;
}
.card-art img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
  display: block; transition: transform 0.3s ease;
}
.card-chip:hover .card-art img { transform: scale(1.04); }
.card-chip.selected .card-art img { transform: scale(1.04); }

/* missing art fallback */
.card-art--missing {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--bg-raised) 0%, var(--bg-card) 100%);
  border-bottom: 1px solid var(--border);
}
.card-art--missing span {
  font-size: 1.4rem; font-weight: 800; color: var(--border-hi);
  font-family: var(--font-display); letter-spacing: 0.05em;
}

/* card info bar */
.card-info {
  padding: 8px 10px; display: flex; flex-direction: column; gap: 2px;
  border-top: 1px solid var(--border); background: var(--bg-card);
  flex: 1;
}
.card-chip.selected .card-info { background: var(--accent-bg); border-top-color: var(--accent-dim); }

.card-name { font-size: 0.72rem; font-weight: 700; color: var(--text); line-height: 1.3; }
.card-chip.selected .card-name { color: var(--accent); }
.card-type { font-size: 0.62rem; font-family: var(--font-mono); color: var(--text-dim); }
.card-dupe { font-size: 0.6rem; font-family: var(--font-mono); color: var(--accent-dim); margin-top: 1px; }

/* coach panel */
.coach-panel {
  background: var(--bg-raised); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.coach-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 16px; border-bottom: 1px solid var(--border);
  background: var(--bg-card);
}
.coach-label { font-size: 0.7rem; font-family: var(--font-mono); color: var(--accent-dim); letter-spacing: 0.08em; }
.coach-body {
  padding: 1.25rem 1.5rem; min-height: 100px;
  font-size: 0.88rem; line-height: 1.75; color: var(--text);
  font-family: var(--font-mono); white-space: pre-wrap;
}
.coach-placeholder { color: var(--text-mute); font-style: italic; }
.coach-loading { color: var(--text-dim); }
.coach-loading::after {
  content: '▋'; display: inline-block;
  animation: blink 0.8s step-end infinite;
}
@keyframes blink { 0%,100%{ opacity:1 } 50%{ opacity:0 } }

/* buttons */
.btn {
  font-family: var(--font-display); font-size: 0.8rem; font-weight: 500;
  padding: 7px 16px; border-radius: var(--radius); cursor: pointer;
  border: 1px solid var(--border); background: transparent; color: var(--text-dim);
  transition: all 0.15s; letter-spacing: 0.02em;
}
.btn:hover:not(:disabled) { border-color: var(--border-hi); color: var(--text); background: var(--bg-raised); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: var(--bg); border-color: var(--accent); font-weight: 700; }
.btn-primary:hover:not(:disabled) { background: #00ffb2; border-color: #00ffb2; color: var(--bg); }
.btn-ghost { border-color: transparent; }
.btn-sm { font-size: 0.72rem; padding: 5px 12px; }

/* deck editors */
.deck-editors { display: flex; flex-direction: column; gap: 10px; }
.deck-editor {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow: hidden;
}
.deck-editor summary {
  padding: 12px 16px; font-size: 0.8rem; font-weight: 500;
  cursor: pointer; color: var(--text-dim); list-style: none;
  display: flex; align-items: center; gap: 8px;
  user-select: none;
}
.deck-editor summary::before { content: '▶'; font-size: 0.6rem; transition: transform 0.15s; }
.deck-editor[open] summary::before { transform: rotate(90deg); }
.deck-editor summary:hover { color: var(--text); }
.editor-inner { padding: 0 16px 16px; display: flex; flex-direction: column; gap: 8px; }
.editor-hint { font-size: 0.72rem; font-family: var(--font-mono); color: var(--text-dim); }
.editor-hint code { color: var(--accent-dim); }
.deck-editor textarea {
  width: 100%; height: 180px; resize: vertical;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); font-family: var(--font-mono); font-size: 0.75rem;
  padding: 10px 12px; line-height: 1.6; outline: none;
}
.deck-editor textarea:focus { border-color: var(--border-hi); }
.editor-footer { display: flex; align-items: center; justify-content: space-between; }
.editor-status { font-size: 0.72rem; font-family: var(--font-mono); color: var(--accent-dim); }

/* page nav */
.page-nav {
  max-width: 860px; margin: 0 auto;
  padding: 0 1.5rem;
  display: flex; gap: 0; border-bottom: 1px solid var(--border);
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.page-nav::-webkit-scrollbar { display: none; }
.page-tab {
  font-family: var(--font-display); font-size: 0.82rem; font-weight: 500;
  padding: 10px 16px; background: transparent; border: none;
  color: var(--text-dim); cursor: pointer; white-space: nowrap; flex-shrink: 0;
  border-bottom: 2px solid transparent; margin-bottom: -1px;
  transition: color 0.15s, border-color 0.15s;
}
.page-tab:hover { color: var(--text); }
.page-tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ── Flashcard session stats ─────────────────────────────────────────────── */
.fc-stats { display: flex; align-items: baseline; gap: 4px; }
.fc-stat {
  font-family: var(--font-mono); font-size: 1rem; font-weight: 500; min-width: 1.4rem;
  text-align: center;
}
.fc-stat--knew   { color: var(--accent); }
.fc-stat--unsure { color: var(--warn); }
.fc-stat--blank  { color: var(--danger); }
.fc-stat-sep     { color: var(--text-mute); font-size: 0.8rem; }
.fc-stat-label   { font-size: 0.65rem; font-family: var(--font-mono); color: var(--text-mute); margin-left: 4px; }

/* ── Flashcard stage ─────────────────────────────────────────────────────── */
.fc-stage {
  display: flex; flex-direction: column; align-items: center; gap: 1.25rem;
}

.fc-card {
  width: 100%; max-width: 400px;
  position: relative;
  perspective: 1200px;
}

/* the two faces share the same space; back starts hidden */
.fc-face {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--bg-card);
}

.fc-back { display: none; }

/* flip state — JS adds .is-flipped to .fc-card */
.fc-card.is-flipped .fc-front { display: none; }
.fc-card.is-flipped .fc-back  { display: block; }

/* front face */
.fc-art-wrap {
  width: 100%; aspect-ratio: 4 / 3; overflow: hidden;
  background: var(--bg); position: relative;
}
.fc-art-wrap img {
  width: 100%; height: 100%; object-fit: cover;
  object-position: top center; display: block;
  transition: opacity 0.2s;
}
.fc-art-wrap img.ice-art { object-position: bottom center; }
.fc-art-placeholder {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; color: var(--border);
  background: var(--bg-raised);
}
.fc-art-placeholder.hidden { display: none; }

.fc-card-name {
  font-size: 1.1rem; font-weight: 800; letter-spacing: 0.03em;
  padding: 14px 16px 4px; color: var(--text);
}
.fc-card-meta {
  font-size: 0.7rem; font-family: var(--font-mono); color: var(--text-dim);
  padding: 0 16px 6px;
}
.fc-hint {
  font-size: 0.7rem; font-family: var(--font-mono); color: var(--text-mute);
  padding: 6px 16px 14px; border-top: 1px solid var(--border); margin-top: 8px;
}

/* back face */
.fc-back-name {
  font-size: 1rem; font-weight: 800; padding: 14px 16px 4px;
  color: var(--accent); letter-spacing: 0.03em;
}
.fc-oracle {
  font-size: 0.8rem; font-family: var(--font-mono); line-height: 1.65;
  color: var(--text); padding: 6px 16px 14px;
  border-bottom: 1px solid var(--border);
  white-space: pre-wrap;
}
.fc-oracle .fc-oracle-stats {
  font-size: 0.68rem; color: var(--text-dim); margin-bottom: 6px;
}
.fc-coach-wrap { padding: 12px 16px 14px; }
.fc-coach-label { font-size: 0.65rem; font-family: var(--font-mono); color: var(--accent-dim); margin-bottom: 6px; letter-spacing: 0.08em; }
.fc-coach-text { font-size: 0.8rem; font-family: var(--font-mono); color: var(--text); line-height: 1.65; white-space: pre-wrap; min-height: 40px; }

/* action / rating bars */
.fc-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.fc-rating { gap: 8px; }

.fc-btn-knew   { border-color: var(--accent-dim);  color: var(--accent);  }
.fc-btn-unsure { border-color: #7a5200;             color: var(--warn);   }
.fc-btn-blank  { border-color: #7a2020;             color: var(--danger); }
.fc-btn-knew:hover   { background: var(--accent-bg); border-color: var(--accent); }
.fc-btn-unsure:hover { background: var(--warn-bg);   border-color: var(--warn);   }
.fc-btn-blank:hover  { background: #1a0505;          border-color: var(--danger); }

/* progress bar */
.fc-progress-wrap { display: flex; flex-direction: column; gap: 6px; }
.fc-progress-bar {
  height: 3px; background: var(--border); border-radius: 2px; overflow: hidden;
}
.fc-progress-fill {
  height: 100%; background: var(--accent); border-radius: 2px;
  width: 0%; transition: width 0.4s ease;
}
.fc-progress-label {
  font-size: 0.7rem; font-family: var(--font-mono); color: var(--text-mute);
  text-align: center;
}

/* weak card list */
.fc-weak-list {
  display: flex; flex-wrap: wrap; gap: 6px; padding-top: 4px;
}
.fc-weak-chip {
  font-size: 0.7rem; font-family: var(--font-mono);
  padding: 3px 10px; border-radius: var(--radius);
  border: 1px solid var(--border); color: var(--text-dim);
  background: var(--bg);
}
.fc-weak-chip.blank  { border-color: #7a2020; color: var(--danger); }
.fc-weak-chip.unsure { border-color: #7a5200; color: var(--warn); }

/* set filter selects */
.fc-set-group select {
  font-family: var(--font-display); font-size: 0.8rem; font-weight: 500;
  padding: 6px 10px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--bg-card);
  color: var(--text-dim); cursor: pointer; max-width: 200px;
  transition: border-color 0.15s, color 0.15s;
}
.fc-set-group select:hover { border-color: var(--border-hi); color: var(--text); }
.fc-set-group select:focus { outline: none; border-color: var(--accent-dim); color: var(--text); }
.fc-set-group select option { background: var(--bg-card); color: var(--text); }

/* ── Challenge mode ──────────────────────────────────────────────────────── */

/* Level map */
.ch-level-map {
  display: flex; flex-direction: column; gap: 12px;
}

.ch-level-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 16px 20px;
  display: flex; align-items: center; gap: 16px;
  transition: border-color 0.15s;
}
.ch-level-card.unlocked:hover { border-color: var(--border-hi); cursor: pointer; }
.ch-level-card.locked { opacity: 0.45; }
.ch-level-card.passed-both { border-color: var(--accent-dim); }

.ch-level-num {
  font-size: 1.4rem; font-weight: 800; font-family: var(--font-display);
  color: var(--text-mute); min-width: 2rem; text-align: center;
  line-height: 1;
}
.ch-level-card.unlocked .ch-level-num { color: var(--text-dim); }
.ch-level-card.passed-both .ch-level-num { color: var(--accent); }

.ch-level-info { flex: 1; }
.ch-level-name {
  font-size: 0.9rem; font-weight: 700; color: var(--text); margin-bottom: 3px;
}
.ch-level-desc {
  font-size: 0.7rem; font-family: var(--font-mono); color: var(--text-dim);
}

.ch-level-modes { display: flex; gap: 8px; }
.ch-mode-btn {
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  padding: 8px 14px; border-radius: var(--radius); border: 1px solid var(--border);
  background: transparent; cursor: pointer; transition: all 0.15s; min-width: 90px;
}
.ch-mode-btn:hover { border-color: var(--border-hi); background: var(--bg-raised); }
.ch-mode-btn.passed { border-color: var(--accent-dim); background: var(--accent-bg); }
.ch-mode-btn.locked { opacity: 0.4; cursor: not-allowed; pointer-events: none; }
.ch-mode-label {
  font-size: 0.68rem; font-family: var(--font-mono); color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.06em;
}
.ch-mode-btn.passed .ch-mode-label { color: var(--accent-dim); }
.ch-mode-badge {
  font-size: 0.75rem; font-weight: 700;
  color: var(--text-mute);
}
.ch-mode-btn.passed .ch-mode-badge { color: var(--accent); }

.ch-lock-icon {
  font-size: 1rem; color: var(--text-mute);
}

/* Active level */
.ch-active-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: 1rem; gap: 1rem;
}
.ch-active-title {
  font-size: 1rem; font-weight: 700; color: var(--text); margin-bottom: 3px;
}
.ch-active-sub {
  font-size: 0.72rem; font-family: var(--font-mono); color: var(--text-dim);
}

/* Threshold bar */
.ch-threshold-wrap { margin-bottom: 1.5rem; }
.ch-threshold-bar {
  height: 6px; background: var(--border); border-radius: 3px;
  overflow: visible; position: relative; margin-bottom: 6px;
}
.ch-threshold-fill {
  height: 100%; background: var(--accent); border-radius: 3px;
  width: 0%; transition: width 0.4s ease;
}
.ch-threshold-marker {
  position: absolute; top: -4px; height: 14px; width: 2px;
  background: var(--warn); border-radius: 1px;
  left: 80%; /* 80% pass threshold */
}
.ch-threshold-label {
  font-size: 0.7rem; font-family: var(--font-mono); color: var(--text-dim);
  display: flex; justify-content: space-between;
}

/* Result screen */
.ch-result {
  display: flex; flex-direction: column; align-items: center;
  gap: 1rem; padding: 3rem 1.5rem; text-align: center;
}
.ch-result-icon { font-size: 3rem; line-height: 1; }
.ch-result-title {
  font-size: 1.3rem; font-weight: 800; color: var(--text);
}
.ch-result-body {
  font-size: 0.85rem; font-family: var(--font-mono); color: var(--text-dim);
  max-width: 360px; line-height: 1.7;
}
.ch-result-actions { display: flex; gap: 10px; margin-top: 0.5rem; }

/* ── Mechanics tab ───────────────────────────────────────────────────────── */

.mech-controls { align-items: center; }

.mech-search-wrap {
  position: relative; flex: 1; min-width: 180px;
}
.mech-search-icon {
  position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  font-size: 1rem; color: var(--text-dim); pointer-events: none;
}
.mech-search {
  width: 100%; padding: 7px 12px 7px 30px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); color: var(--text);
  font-family: var(--font-display); font-size: 0.82rem; outline: none;
}
.mech-search:focus { border-color: var(--border-hi); }
.mech-search::placeholder { color: var(--text-mute); }

.mech-filters { display: flex; gap: 6px; }
.mech-filter-btn {
  padding: 5px 12px; border-radius: var(--radius);
  border: 1px solid var(--border); background: transparent;
  font-family: var(--font-display); font-size: 0.75rem; font-weight: 500;
  color: var(--text-dim); cursor: pointer; transition: all 0.15s;
}
.mech-filter-btn:hover { border-color: var(--border-hi); color: var(--text); }
.mech-filter-btn.active { background: var(--bg-card); color: var(--accent); border-color: var(--accent-dim); }

.mech-count { font-size: 0.7rem; font-family: var(--font-mono); color: var(--text-mute); white-space: nowrap; }

/* Split body */
.mech-body {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 16px;
  min-height: 520px;
}

/* List panel */
.mech-list-wrap {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow-y: auto; max-height: 620px;
}
.mech-list { display: flex; flex-direction: column; }
.mech-list-item {
  display: flex; align-items: center; justify-content: space-between;
  gap: 8px; padding: 10px 14px;
  background: transparent; border: none; border-bottom: 1px solid var(--border);
  text-align: left; cursor: pointer; transition: background 0.12s;
  width: 100%;
}
.mech-list-item:last-child { border-bottom: none; }
.mech-list-item:hover { background: var(--bg-raised); }
.mech-list-item.active { background: var(--accent-bg); }
.mech-item-term {
  font-size: 0.8rem; font-weight: 500; color: var(--text); flex: 1;
  text-align: left; line-height: 1.3;
}
.mech-list-item.active .mech-item-term { color: var(--accent); }

/* Type badges */
.mech-item-badge {
  font-size: 0.6rem; font-family: var(--font-mono); font-weight: 500;
  padding: 2px 6px; border-radius: 3px; white-space: nowrap;
  text-transform: uppercase; letter-spacing: 0.05em; flex-shrink: 0;
}
.mech-badge-mechanic { background: var(--corp-bg); color: var(--corp); border: 1px solid #1a3a5c; }
.mech-badge-concept  { background: var(--runner-bg); color: var(--runner); border: 1px solid #3a1a5c; }

.mech-empty {
  padding: 2rem 1rem; font-size: 0.8rem; font-family: var(--font-mono);
  color: var(--text-mute); text-align: center;
}

/* Detail panel */
.mech-detail-wrap {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); overflow-y: auto; max-height: 620px;
}
.mech-detail { padding: 1.25rem 1.5rem; }
.mech-detail-empty {
  font-size: 0.8rem; font-family: var(--font-mono); color: var(--text-mute);
  padding: 2rem; text-align: center;
}

.mech-detail-header { margin-bottom: 0.75rem; }
.mech-detail-title-row {
  display: flex; align-items: center; gap: 10px; margin-bottom: 4px;
}
.mech-detail-term {
  font-size: 1.1rem; font-weight: 800; color: var(--text); margin: 0;
}
.mech-detail-tier {
  font-size: 0.65rem; font-family: var(--font-mono); color: var(--text-dim);
  display: block; margin-top: 2px;
}
.mech-detail-short {
  font-size: 0.85rem; font-weight: 500; color: var(--text);
  line-height: 1.6; margin-bottom: 0.75rem;
}
.mech-detail-divider {
  height: 1px; background: var(--border); margin-bottom: 0.75rem;
}
.mech-detail-body {
  font-size: 0.82rem; font-family: var(--font-mono); color: var(--text-dim);
  line-height: 1.75;
}

/* See also links */
.mech-see-also {
  margin-top: 1rem; padding-top: 0.75rem;
  border-top: 1px solid var(--border);
  display: flex; align-items: baseline; flex-wrap: wrap; gap: 6px;
}
.mech-see-also-label {
  font-size: 0.65rem; font-family: var(--font-mono); color: var(--text-mute);
  text-transform: uppercase; letter-spacing: 0.06em; margin-right: 2px;
}
.mech-see-also-link {
  font-size: 0.72rem; font-family: var(--font-mono);
  padding: 3px 8px; border-radius: var(--radius);
  border: 1px solid var(--border); background: transparent;
  color: var(--accent-dim); cursor: pointer; transition: all 0.15s;
}
.mech-see-also-link:hover { border-color: var(--accent-dim); color: var(--accent); background: var(--accent-bg); }

/* ── Start here page ─────────────────────────────────────────────────────── */

.sh-hero {
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}
.sh-title {
  font-size: 2rem; font-weight: 800; color: var(--text);
  letter-spacing: 0.04em; margin-bottom: 0.5rem;
}
.sh-subtitle {
  font-size: 0.9rem; color: var(--text-dim); font-family: var(--font-mono);
  max-width: 560px; line-height: 1.6;
}

.sh-section { margin-bottom: 2.5rem; }
.sh-section--note {
  border-top: 1px solid var(--border); padding-top: 1.5rem;
  margin-top: 1rem;
}
.sh-heading {
  font-size: 0.75rem; font-weight: 500; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--accent-dim);
  font-family: var(--font-mono); margin-bottom: 1rem;
}
.sh-body {
  font-size: 0.88rem; color: var(--text-dim); line-height: 1.8;
  max-width: 660px; margin-bottom: 0.75rem;
}
.sh-body strong { color: var(--text); font-weight: 500; }

/* External links */
.sh-links {
  display: flex; flex-direction: column; gap: 8px;
  margin-top: 1.25rem; max-width: 560px;
}
.sh-link {
  display: flex; align-items: baseline; gap: 12px;
  padding: 10px 14px; border-radius: var(--radius-lg);
  border: 1px solid var(--border); background: var(--bg-card);
  text-decoration: none; transition: border-color 0.15s, background 0.15s;
}
.sh-link:hover { border-color: var(--border-hi); background: var(--bg-raised); }
.sh-link-label {
  font-size: 0.82rem; font-weight: 700; color: var(--accent);
  white-space: nowrap; flex-shrink: 0;
}
.sh-link-desc {
  font-size: 0.75rem; font-family: var(--font-mono); color: var(--text-dim);
  line-height: 1.4;
}
.sh-inline-link { color: var(--accent-dim); text-decoration: none; }
.sh-inline-link:hover { color: var(--accent); text-decoration: underline; }

/* Tab description cards */
.sh-tab-grid {
  display: flex; flex-direction: column; gap: 10px;
  margin-top: 1.25rem;
}
.sh-tab-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 14px 18px;
}
.sh-tab-name {
  font-size: 0.78rem; font-weight: 700; color: var(--accent);
  font-family: var(--font-mono); letter-spacing: 0.04em;
  text-transform: uppercase; margin-bottom: 6px;
}
.sh-tab-body {
  font-size: 0.82rem; color: var(--text-dim); line-height: 1.75; margin: 0;
}
.sh-tab-body strong { color: var(--text); font-weight: 500; }
.sh-tab-body em { color: var(--text); font-style: normal; }
.sh-tab-body code {
  font-family: var(--font-mono); font-size: 0.78rem;
  background: var(--bg-raised); padding: 1px 5px; border-radius: 3px;
  color: var(--accent-dim);
}
kbd {
  font-family: var(--font-mono); font-size: 0.72rem;
  background: var(--bg-raised); border: 1px solid var(--border);
  border-radius: 3px; padding: 1px 5px; color: var(--text-dim);
}

/* responsive */
@media (max-width: 600px) {
  header { padding: 1rem; flex-direction: column; gap: 4px; }
  main { padding: 1.25rem 1rem 3rem; }
  .controls-bar { gap: 1rem; }
  .hand-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); }
  .fc-card { max-width: 100%; }
  .ch-level-card { flex-wrap: wrap; }
  .ch-level-modes { width: 100%; }
  .ch-mode-btn { flex: 1; }
  .mech-body { grid-template-columns: 1fr; }
  .mech-list-wrap, .mech-detail-wrap { max-height: 340px; }
}