/* EM Exam Command Center — design system */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* Color */
  --bg: #ffffff;
  --surface: #f8fafc;
  --surface-2: #f1f5f9;
  --navy: #091225;
  --primary: #2563ff;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff4ff;
  --soft: #eef2f7;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #091225;
  --muted: #64748b;
  --muted-2: #94a3b8;

  --ok: #059669;
  --ok-soft: #ecfdf5;
  --warn: #d97706;
  --warn-soft: #fffbeb;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --info: #2563ff;
  --info-soft: #eff4ff;

  --p1: #b45309;
  --p1-bg: #fff7ed;
  --p1-border: #fed7aa;
  --p2: #1d4ed8;
  --p2-bg: #eff4ff;
  --p2-border: #bfdbfe;
  --p3: #475569;
  --p3-bg: #f8fafc;
  --p3-border: #e2e8f0;
  --p4: #94a3b8;
  --p4-bg: #f8fafc;
  --p4-border: #e2e8f0;

  /* Type */
  --font: Inter, ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --mono: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --fs-page: clamp(1.75rem, 2.2vw, 2.25rem);
  --fs-section: 1.25rem;
  --fs-card: 1.05rem;
  --fs-body: 0.9375rem;
  --fs-meta: 0.75rem;
  --lh: 1.55;

  /* Space (8px system) */
  --s1: 4px;
  --s2: 8px;
  --s3: 12px;
  --s4: 16px;
  --s5: 24px;
  --s6: 32px;
  --s7: 40px;
  --s8: 48px;
  --s9: 64px;

  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow: 0 1px 2px rgba(9,18,37,.04), 0 8px 24px rgba(9,18,37,.06);
  --shadow-sm: 0 1px 2px rgba(9,18,37,.05);
  --ease: 180ms cubic-bezier(.2,.8,.2,1);
  --sidebar-w: 248px;
  --read-max: 780px;
  --content-max: 1080px;
  --header-h: 56px;
  --bottom-nav-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font);
  font-size: var(--fs-body);
  line-height: var(--lh);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); border: 0;
}
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Shell */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--bg);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  z-index: 40;
}
.sidebar-brand {
  padding: var(--s4) var(--s4) var(--s3);
  border-bottom: 1px solid var(--border);
}
.sidebar-brand .code {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--primary);
}
.sidebar-brand h1 {
  margin: 4px 0 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--navy);
}
.sidebar-brand p {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}
.side-nav {
  flex: 1;
  overflow: auto;
  padding: var(--s3);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav-group {
  margin-top: var(--s4);
  margin-bottom: var(--s2);
  padding: 0 var(--s2);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted-2);
}
.nav-group:first-child { margin-top: var(--s2); }
.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--s2);
  width: 100%;
  text-align: left;
  background: transparent;
  border: 0;
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  min-height: 40px;
  cursor: pointer;
  color: var(--muted);
  font-size: 13.5px;
  font-weight: 500;
  transition: background var(--ease), color var(--ease);
}
.nav-btn:hover { background: var(--surface); color: var(--text); }
.nav-btn.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 600;
}
.nav-btn .ico { width: 18px; text-align: center; opacity: .85; font-size: 13px; }
.sidebar-foot {
  padding: var(--s3) var(--s4);
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--muted);
}

.main-wrap {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background: var(--surface);
}
.topbar {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: var(--s3);
  padding: 0 var(--s5);
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 30;
}
.topbar .countdown {
  font-weight: 700;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--navy);
}
.topbar .countdown strong { color: var(--warn); }
.topbar .day-chip {
  font-size: 12px;
  color: var(--muted);
  background: var(--soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
}
.content {
  padding: var(--s5) var(--s5) calc(var(--s8) + var(--bottom-nav-h));
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
}
.content.narrow { max-width: var(--read-max); }
.overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(9,18,37,.4);
  z-index: 35;
}
.overlay.open { display: block; }

/* Bottom nav (mobile) */
.bottom-nav {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  height: var(--bottom-nav-h);
  background: var(--bg);
  border-top: 1px solid var(--border);
  z-index: 45;
  padding: 4px 8px calc(4px + env(safe-area-inset-bottom));
  justify-content: space-around;
  align-items: stretch;
}
.bottom-nav button {
  flex: 1;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 10px;
  font-weight: 600;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  min-height: 44px;
}
.bottom-nav button .ico { font-size: 16px; }
.bottom-nav button.active { color: var(--primary); background: var(--primary-soft); }

/* Primitives */
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--s4) var(--s5);
  box-shadow: var(--shadow-sm);
}
.card-flush { padding: 0; overflow: hidden; }
.card + .card { margin-top: var(--s3); }
.panel {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s5);
  box-shadow: var(--shadow-sm);
}
.stack { display: flex; flex-direction: column; gap: var(--s4); }
.stack-sm { display: flex; flex-direction: column; gap: var(--s2); }
.row { display: flex; gap: var(--s2); flex-wrap: wrap; align-items: center; }
.spacer { flex: 1; }
.muted { color: var(--muted); }
.meta { font-size: var(--fs-meta); color: var(--muted); }

.grid { display: grid; gap: var(--s3); }
.grid-2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
@media (max-width: 960px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

.h1 {
  font-size: var(--fs-page);
  font-weight: 750;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin: 0 0 var(--s2);
  color: var(--navy);
}
.h2 {
  font-size: var(--fs-section);
  font-weight: 700;
  letter-spacing: -.02em;
  margin: 0 0 var(--s2);
  color: var(--navy);
}
.h3 {
  font-size: var(--fs-card);
  font-weight: 650;
  margin: 0 0 var(--s2);
  color: var(--navy);
}
.kicker {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 var(--s2);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .04em;
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid transparent;
  white-space: nowrap;
}
.badge-p1 { background: var(--p1-bg); color: var(--p1); border-color: var(--p1-border); }
.badge-p2 { background: var(--p2-bg); color: var(--p2); border-color: var(--p2-border); }
.badge-p3 { background: var(--p3-bg); color: var(--p3); border-color: var(--p3-border); }
.badge-p4 { background: var(--p4-bg); color: var(--p4); border-color: var(--p4-border); }
.badge-ok { background: var(--ok-soft); color: var(--ok); }
.badge-bad { background: var(--danger-soft); color: var(--danger); }
.badge-warn { background: var(--warn-soft); color: var(--warn); }
.badge-muted { background: var(--soft); color: var(--muted); border-color: var(--border); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-weight: 600;
  font-size: 13.5px;
  border: 1px solid transparent;
  cursor: pointer;
  background: var(--soft);
  color: var(--text);
  transition: background var(--ease), border-color var(--ease), transform 100ms ease, box-shadow var(--ease);
}
.btn:hover { filter: none; background: var(--surface-2); }
.btn:active { transform: scale(.98); }
.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 1px 2px rgba(37,99,255,.25);
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-secondary {
  background: var(--bg);
  border-color: var(--border);
  color: var(--text);
}
.btn-secondary:hover { border-color: var(--border-strong); background: var(--surface); }
.btn-ghost {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
}
.btn-ghost:hover { background: var(--soft); color: var(--text); }
.btn-ok { background: var(--ok); color: #fff; }
.btn-bad { background: var(--danger); color: #fff; }
.btn-warn { background: var(--warn-soft); color: var(--warn); border-color: #fde68a; }
.btn-sm { min-height: 32px; padding: 4px 10px; font-size: 12.5px; }
.btn-lg { min-height: 48px; padding: 12px 20px; font-size: 15px; }
.btn-block { width: 100%; }
.btn-icon { width: 40px; padding: 0; }

/* Progress */
.progress {
  height: 6px;
  background: var(--soft);
  border-radius: 999px;
  overflow: hidden;
}
.progress > span {
  display: block;
  height: 100%;
  background: var(--primary);
  border-radius: 999px;
  transition: width 220ms ease;
}
.progress-lg { height: 10px; }
.progress-warn > span { background: var(--warn); }

/* Forms */
.input, .select, .textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  min-height: 40px;
  color: var(--text);
  transition: border-color var(--ease), box-shadow var(--ease);
}
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37,99,255,.12);
  outline: none;
}
.textarea { min-height: 96px; resize: vertical; }
.label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 6px;
}

/* Lists / topic rows */
.list-item {
  display: flex;
  gap: var(--s3);
  align-items: center;
  padding: var(--s3) var(--s4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  cursor: pointer;
  transition: border-color var(--ease), box-shadow var(--ease), background var(--ease);
}
.list-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.list-item + .list-item { margin-top: var(--s2); }
.topic-row {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--s3);
  align-items: center;
  padding: var(--s3) var(--s4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  cursor: pointer;
  transition: border-color var(--ease), background var(--ease);
}
.topic-row:hover { border-color: #c7d2fe; background: #fafbff; }
.topic-row + .topic-row { margin-top: var(--s2); }
.topic-row .title { font-weight: 650; color: var(--navy); font-size: 14.5px; }
.topic-row .meta-line { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* Dashboard */
.dash-hero {
  display: grid;
  grid-template-columns: 1.4fr .9fr;
  gap: var(--s4);
}
@media (max-width: 900px) {
  .dash-hero { grid-template-columns: 1fr; }
}
.nba-card {
  background: var(--navy);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--s5) var(--s6);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}
.nba-card::after {
  content: '';
  position: absolute;
  right: -40px; top: -40px;
  width: 180px; height: 180px;
  border-radius: 50%;
  background: rgba(37,99,255,.25);
  pointer-events: none;
}
.nba-card .kicker { color: rgba(255,255,255,.55); }
.nba-card .h2 { color: #fff; font-size: 1.45rem; margin: 8px 0 12px; max-width: 28ch; }
.nba-card .reasons {
  margin: 0 0 var(--s4);
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.nba-card .reasons li {
  font-size: 12px;
  background: rgba(255,255,255,.08);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 999px;
  padding: 4px 10px;
  color: rgba(255,255,255,.85);
}
.nba-card .btn-primary {
  background: #fff;
  color: var(--navy);
  box-shadow: none;
}
.nba-card .btn-primary:hover { background: #eef2ff; }
.countdown-panel {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s5);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 100%;
}
.countdown-big {
  font-size: clamp(2.4rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1;
  color: var(--navy);
}
.countdown-big span { color: var(--warn); }
.ready-line {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 8px;
}
.ready-line strong { font-size: 1.25rem; color: var(--primary); }
.metric {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--s3) var(--s4);
}
.metric .label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}
.metric .value {
  font-size: 1.35rem;
  font-weight: 750;
  letter-spacing: -.02em;
  margin-top: 4px;
  color: var(--navy);
}
.metric .sub { font-size: 12px; color: var(--muted); margin-top: 2px; }

/* Formula block */
.formula-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--s5);
  text-align: center;
  margin: var(--s3) 0;
}
.formula-card .formula-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  margin-top: var(--s2);
}

/* Markdown / reading */
.md-body {
  font-size: 15px;
  line-height: 1.65;
  color: #1e293b;
  max-width: 72ch;
}
.md-body p { margin: .65rem 0; }
.md-body ul, .md-body ol { padding-left: 1.25rem; }
.md-body table {
  width: 100%;
  border-collapse: collapse;
  margin: .85rem 0;
  font-size: 13.5px;
}
.md-body th, .md-body td {
  border: 1px solid var(--border);
  padding: 8px 10px;
  text-align: left;
}
.md-body th { background: var(--surface); }
.md-body pre, .md-body code { font-family: var(--mono); }
.md-body pre {
  background: var(--navy);
  color: #e2e8f0;
  padding: 14px;
  border-radius: var(--radius-sm);
  overflow: auto;
}

/* Collapsible sections */
.section-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
}
.section-block + .section-block { margin-top: var(--s3); }
.section-block > summary,
.section-head {
  list-style: none;
  cursor: pointer;
  padding: var(--s3) var(--s4);
  font-weight: 650;
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s2);
  background: var(--bg);
  border: 0;
  width: 100%;
  text-align: left;
}
.section-block > summary::-webkit-details-marker { display: none; }
.section-block > summary::after { content: '▾'; color: var(--muted); font-size: 12px; }
.section-block[open] > summary::after { content: '▴'; }
.section-body { padding: 0 var(--s4) var(--s4); border-top: 1px solid var(--border); }

/* Questions / MCQ */
.q-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  padding: var(--s4);
  margin-top: var(--s3);
}
.mcq-opt {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  min-height: 52px;
  cursor: pointer;
  background: var(--bg);
  transition: border-color var(--ease), background var(--ease), box-shadow var(--ease);
}
.mcq-opt:hover { border-color: #93c5fd; background: #f8fbff; }
.mcq-opt .bullet {
  width: 24px; height: 24px; flex-shrink: 0;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: var(--muted);
  margin-top: 1px;
}
.mcq-opt.selected {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 3px rgba(37,99,255,.1);
}
.mcq-opt.selected .bullet {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}
.mcq-opt.correct {
  border-color: var(--ok);
  background: var(--ok-soft);
}
.mcq-opt.correct .bullet { border-color: var(--ok); background: var(--ok); color: #fff; }
.mcq-opt.wrong {
  border-color: var(--danger);
  background: var(--danger-soft);
}
.mcq-opt.wrong .bullet { border-color: var(--danger); background: var(--danger); color: #fff; }
.mcq-opt.locked { pointer-events: none; }

/* Revision / focus / mock immersive */
.immersive {
  max-width: 680px;
  margin: 0 auto;
  padding-top: var(--s4);
}
.immersive-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s6) var(--s5);
  min-height: 260px;
  box-shadow: var(--shadow-sm);
}
.focus-mode .sidebar,
.focus-mode .topbar,
.focus-mode .bottom-nav { display: none !important; }
.focus-mode .content {
  max-width: 720px;
  padding-bottom: var(--s8);
}
.mock-shell .sidebar,
.mock-shell .bottom-nav { display: none !important; }
.mock-shell .content { max-width: 860px; }
.mock-timer {
  font-variant-numeric: tabular-nums;
  font-weight: 750;
  color: var(--warn);
  background: var(--warn-soft);
  border: 1px solid #fde68a;
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 14px;
}

/* Sticky action bar */
.sticky-actions {
  position: sticky;
  bottom: calc(var(--bottom-nav-h) + 8px);
  z-index: 20;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  display: flex;
  gap: 8px;
  align-items: center;
  box-shadow: var(--shadow);
  margin-top: var(--s4);
}
@media (min-width: 1024px) {
  .sticky-actions { bottom: 16px; }
}

/* Empty / toast */
.empty {
  text-align: center;
  padding: var(--s8) var(--s5);
  color: var(--muted);
}
.empty .empty-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--navy);
  margin: 0 0 8px;
}
.toast-host {
  position: fixed;
  right: 16px;
  bottom: calc(var(--bottom-nav-h) + 16px);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  background: var(--navy);
  color: #fff;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  box-shadow: var(--shadow);
  animation: toast-in 180ms ease;
  display: flex;
  align-items: center;
  gap: 12px;
  max-width: min(360px, calc(100vw - 32px));
}
@keyframes toast-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}
.toast .toast-msg { flex: 1; min-width: 0; }
.toast .toast-undo {
  flex-shrink: 0;
  background: transparent;
  border: 1px solid rgba(255,255,255,.35);
  color: #fff;
  font: inherit;
  font-weight: 650;
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 6px;
  cursor: pointer;
}
.toast .toast-undo:hover { background: rgba(255,255,255,.12); }

/* Progress confirmation */
.progress-confirm-host {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px 16px;
  background: rgba(9, 18, 37, 0.48);
}
.progress-confirm-host.open { display: flex; }
.progress-confirm-card {
  width: min(440px, 100%);
  max-height: min(90vh, 640px);
  overflow: auto;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: 22px 22px 18px;
  outline: none;
}
.pc-kicker {
  margin: 0 0 6px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.pc-title {
  margin: 0 0 4px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.25;
}
.pc-item {
  margin: 0 0 12px;
  font-size: 14px;
  font-weight: 650;
  color: var(--primary);
}
.pc-body {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
}
.pc-preview {
  background: var(--surface, #f8fafc);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px;
  margin-bottom: 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.pc-preview-label {
  font-size: 12px;
  font-weight: 650;
  color: var(--navy);
  margin-bottom: 6px;
}
.pc-preview-cols {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 8px;
  align-items: end;
}
.pc-arrow {
  color: var(--muted);
  font-weight: 700;
  padding-bottom: 4px;
}
.pc-bar {
  height: 8px;
  background: #e2e8f0;
  border-radius: 99px;
  overflow: hidden;
  margin: 4px 0 2px;
}
.pc-bar span {
  display: block;
  height: 100%;
  background: var(--primary);
  border-radius: 99px;
}
.pc-bar-pct {
  font-size: 11px;
  font-weight: 650;
  color: var(--muted);
}
.pc-effects {
  margin: 0 0 12px;
  padding-left: 18px;
  font-size: 13px;
  color: var(--text);
  line-height: 1.45;
}
.pc-effects li { margin-bottom: 4px; }
.pc-ask {
  margin: 0 0 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
}
.pc-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}
.pc-actions .btn { min-height: 44px; min-width: 110px; }
.btn-danger {
  background: #dc2626;
  color: #fff;
  border: 1px solid #b91c1c;
}
.btn-danger:hover { background: #b91c1c; }
.btn-danger:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  background: #dc2626;
}
.danger-zone {
  margin-top: 16px;
  padding: 14px;
  border: 1px solid #fecaca;
  background: #fff7f7;
  border-radius: var(--radius-sm);
}
.danger-zone-title {
  margin: 0 0 6px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #b91c1c;
}
.progress-confirm-danger .pc-title { color: #991b1b; }
.pc-type-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--navy);
  margin: 0 0 8px;
}
.pc-type-input {
  margin-bottom: 16px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  letter-spacing: 0.08em;
}
.pc-stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px 14px;
}
.pc-stat-grid strong {
  display: block;
  font-size: 15px;
  color: var(--navy);
  margin-top: 2px;
}
@media (max-width: 480px) {
  .pc-actions { flex-direction: column-reverse; }
  .pc-actions .btn { width: 100%; }
  .pc-preview-cols { grid-template-columns: 1fr; }
  .pc-arrow { display: none; }
  .pc-stat-grid { grid-template-columns: 1fr; }
}

/* Checklist */
.checklist label {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  font-size: 14px;
  min-height: 44px;
}
.checklist input { margin-top: 3px; width: 16px; height: 16px; accent-color: var(--primary); }

/* Search */
.search-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 12vh 16px;
  background: rgba(9,18,37,.45);
}
.search-modal.open { display: flex; }
.search-panel {
  width: min(640px, 100%);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.search-panel input {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
  padding: 16px 18px;
  font-size: 16px;
}
.search-results { max-height: 50vh; overflow: auto; }
.search-hit {
  display: block;
  width: 100%;
  text-align: left;
  padding: 12px 18px;
  border: 0;
  border-bottom: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
}
.search-hit:hover, .search-hit.active { background: var(--primary-soft); }

.menu-btn { display: none; }
.hidden { display: none !important; }

/* Plan day (legacy list kept for safety) */
.plan-day {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--bg);
  overflow: hidden;
}
.plan-day.today { border-color: #93c5fd; box-shadow: 0 0 0 3px rgba(37,99,255,.08); }
.plan-day-head {
  padding: var(--s4) var(--s5);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.plan-task {
  display: grid;
  grid-template-columns: 64px 1fr auto;
  gap: var(--s3);
  padding: var(--s3) var(--s5);
  border-bottom: 1px solid var(--border);
  align-items: center;
}
.plan-task:last-child { border-bottom: 0; }
.plan-task .time {
  font-size: 12px;
  font-weight: 650;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* 4-Day Plan execution UI */
.day-tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
}
.day-tab {
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: var(--radius-sm);
  padding: 10px 8px;
  text-align: left;
  cursor: pointer;
  min-height: 52px;
}
.day-tab:hover { border-color: #93c5fd; }
.day-tab.active {
  border-color: var(--primary);
  background: var(--primary-soft);
  box-shadow: 0 0 0 3px rgba(37,99,255,.08);
}
.day-tab.done .day-tab-label { color: var(--ok, #15803d); }
.day-tab-label {
  display: block;
  font-weight: 700;
  font-size: 13px;
  color: var(--navy);
}
.day-tab-sub {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-top: 2px;
}
.plan-section { margin-top: 4px; }
.plan-section-title {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.plan-card-list { display: flex; flex-direction: column; gap: 10px; }
.plan-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  padding: 14px 16px;
}
.plan-card-current {
  border-color: #93c5fd;
  box-shadow: 0 0 0 3px rgba(37,99,255,.08);
  background: linear-gradient(180deg, #f8fbff 0%, var(--bg) 48%);
}
.plan-card-done {
  opacity: 0.92;
  background: var(--surface, #f8fafc);
}
.plan-card-overdue { border-color: #fde68a; }
.plan-card-status {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 6px;
}
.plan-card-done .plan-card-status { color: var(--ok, #15803d); }
.plan-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 6px;
}
.plan-card-time {
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--navy);
  font-size: 14px;
}
.plan-card-title {
  margin: 0 0 4px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.3;
}
.plan-card-desc {
  margin: 0 0 12px;
  font-size: 13px;
  color: var(--muted);
  line-height: 1.45;
}
.plan-card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.plan-day-complete {
  border-color: #86efac;
  background: #f0fdf4;
}
.plan-finish-cta {
  border-color: #86efac;
  background: #f8fffb;
}
.plan-timer {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.plan-timeup {
  margin-top: 14px;
  padding: 12px;
  border-radius: var(--radius-sm);
  background: #fffbeb;
  border: 1px solid #fde68a;
}
@media (max-width: 720px) {
  .day-tabs { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .plan-metrics.grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* Chapter-wise practice */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--s3);
}
@media (max-width: 720px) {
  .mode-grid { grid-template-columns: 1fr; }
}
.mode-card {
  display: block;
  text-align: left;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--s4);
  cursor: pointer;
  transition: border-color var(--ease), box-shadow var(--ease), background var(--ease);
  width: 100%;
}
.mode-card:hover {
  border-color: #93c5fd;
  background: #fafbff;
  box-shadow: var(--shadow-sm);
}
.mode-card.featured {
  border-color: #93c5fd;
  background: linear-gradient(180deg, #eff4ff, #fff);
  grid-column: 1 / -1;
}
.mode-card .mode-title {
  font-weight: 700;
  font-size: 15px;
  color: var(--navy);
  margin: 0 0 4px;
}
.mode-card .mode-desc {
  font-size: 13px;
  color: var(--muted);
  margin: 0;
}
.chapter-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s5);
  display: flex;
  flex-direction: column;
  gap: var(--s3);
  transition: border-color var(--ease), box-shadow var(--ease);
}
.chapter-card:hover {
  border-color: #93c5fd;
  box-shadow: var(--shadow-sm);
}
.chapter-card .ch-num {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  color: var(--primary);
  text-transform: uppercase;
}
.chapter-card .ch-title {
  font-size: 1.15rem;
  font-weight: 750;
  letter-spacing: -.02em;
  color: var(--navy);
  margin: 0;
}
.chip-row { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  background: var(--soft);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
}
.practice-progress {
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 650;
  color: var(--muted);
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Responsive */
@media (max-width: 1023px) {
  .menu-btn { display: inline-flex; }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    transform: translateX(-105%);
    transition: transform 200ms ease;
    box-shadow: var(--shadow);
  }
  .sidebar.open { transform: translateX(0); }
  .bottom-nav { display: flex; }
  .content { padding: var(--s4) var(--s4) calc(var(--s7) + var(--bottom-nav-h)); }
  .topbar { padding: 0 var(--s4); }
  .plan-task { grid-template-columns: 1fr auto; }
  .plan-task .time { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
}