@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,500;0,9..144,600;0,9..144,700;1,9..144,500;1,9..144,600&family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #f2e9db;
  --bg-elev-1: #fbf6ec;
  --bg-elev-2: #ece0cb;
  --bg-elev-3: #e3d3b4;
  --ink: #241c14;
  --ink-dim: #6e5f4c;
  --ink-faint: #a4937a;
  --border: rgba(36, 28, 20, 0.16);
  --border-strong: #241c14;
  --border-soft: rgba(36, 28, 20, 0.09);
  --accent: #cc7522;
  --accent-ink: #fbf6ec;
  --accent-soft: #f3dcb6;
  --accent-glow: rgba(204, 117, 34, 0.16);
  --good: #4b7a3d;
  --good-dim: #dfe9d1;
  --warn: #a8641b;
  --warn-dim: #f1dfba;
  --danger: #ad3c2c;
  --danger-dim: #f2d9d2;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 26px;
  --radius-pill: 999px;
  --shadow-1: 0 1px 2px rgba(36,28,20,0.08);
  --shadow-2: 0 14px 34px rgba(36,28,20,0.14);
  --font-display: 'Fraunces', ui-serif, Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, monospace;
}

html[data-theme="dark"] {
  --bg: #1b140d;
  --bg-elev-1: #241b12;
  --bg-elev-2: #2c2116;
  --bg-elev-3: #392a1b;
  --ink: #f3ecdf;
  --ink-dim: #c4b39a;
  --ink-faint: #8a795f;
  --border: rgba(243, 236, 223, 0.14);
  --border-strong: #f3ecdf;
  --border-soft: rgba(243, 236, 223, 0.08);
  --accent: #e6923f;
  --accent-ink: #1b140d;
  --accent-soft: #4a3720;
  --accent-glow: rgba(230, 146, 63, 0.18);
  --good: #8fc178;
  --good-dim: #2c3a24;
  --warn: #e0a83e;
  --warn-dim: #40331a;
  --danger: #e2796a;
  --danger-dim: #402420;
  --shadow-1: 0 1px 2px rgba(0,0,0,0.35);
  --shadow-2: 0 16px 36px rgba(0,0,0,0.4);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(circle at 1.5px 1.5px, rgba(36,28,20,0.05) 1px, transparent 0);
  background-size: 22px 22px;
}
html[data-theme="dark"] body {
  background-image: radial-gradient(circle at 1.5px 1.5px, rgba(243,236,223,0.04) 1px, transparent 0);
  background-size: 22px 22px;
}

::selection { background: var(--accent-glow); }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--bg-elev-3); border-radius: 8px; }
::-webkit-scrollbar-track { background: transparent; }
button { font-family: inherit; }

.app { min-height: 100vh; display: flex; flex-direction: column; }

/* Top bar */
.topbar {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 14px 28px;
  background: var(--bg-elev-1);
  border-bottom: 2px solid var(--border-strong);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  color: var(--ink);
  font-family: inherit;
}
.brand-mark {
  width: 30px; height: 30px;
  display: flex; align-items: center; justify-content: center;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 50%;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  border: 2px solid var(--border-strong);
}
.brand-name {
  font-weight: 800;
  font-size: 15px;
  letter-spacing: -0.01em;
}

.subject-strip {
  flex: 1;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 2px 2px;
  scrollbar-width: none;
}
.subject-strip::-webkit-scrollbar { display: none; }

.subject-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  color: var(--ink-dim);
  white-space: nowrap;
  border: 1.5px solid transparent;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
  flex-shrink: 0;
}
.subject-item:hover { background: var(--bg-elev-2); color: var(--ink); }
.subject-item:active { transform: scale(0.98); }
.subject-item.active {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--border-strong);
}
.subject-item .code { font-size: 11px; font-weight: 700; letter-spacing: 0.03em; text-transform: uppercase; opacity: 0.75; }
.subject-item .name { display: none; }
.subject-item .pct {
  font-size: 10.5px; font-weight: 700; font-variant-numeric: tabular-nums;
  background: rgba(0,0,0,0.12);
  padding: 1px 6px;
  border-radius: var(--radius-pill);
}
.subject-item.active .pct { background: rgba(255,255,255,0.28); }

.topbar-actions { display: flex; gap: 8px; flex-shrink: 0; align-items: center; }
.btn-dsa {
  background: var(--ink); color: var(--bg);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-pill);
  padding: 9px 16px;
  font-size: 13px; font-weight: 700;
  cursor: pointer;
  transition: opacity 0.15s ease, transform 0.1s ease;
}
.btn-dsa:hover { opacity: 0.85; }
.btn-dsa:active { transform: scale(0.97); }
.btn-dsa.active { background: var(--accent); color: var(--accent-ink); }
.icon-btn {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-pill);
  background: var(--bg-elev-1);
  border: 1.5px solid var(--border-strong);
  color: var(--ink);
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}
.icon-btn:hover { background: var(--accent-soft); }
.icon-btn:active { transform: scale(0.94); }

/* Main */
.main {
  flex: 1;
  overflow-y: auto;
  padding: 36px 32px 90px;
}
.landing-view[hidden] { display: none; }
.subject-view[hidden] { display: none; }
.landing-view { max-width: 1040px; margin: 0 auto; animation: fadeIn 0.25s ease; }

.landing-hero { text-align: center; padding: 40px 20px 34px; }
.landing-mark {
  width: 60px; height: 60px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display); font-weight: 700; font-size: 26px;
  background: var(--accent); color: var(--accent-ink);
  border: 2px solid var(--border-strong);
  margin: 0 auto 20px;
}
.landing-greeting {
  font-family: var(--font-display); font-style: italic; font-weight: 600;
  font-size: 36px; letter-spacing: -0.01em; color: var(--ink); margin-bottom: 12px;
  text-wrap: balance;
}
.landing-purpose { margin: 0 auto; font-size: 14.5px; line-height: 1.6; color: var(--ink-dim); max-width: 520px; }

.landing-shortcuts { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; margin-bottom: 26px; }
.landing-shortcut-card {
  display: flex; flex-direction: column; gap: 4px;
  background: var(--bg-elev-1); border: 1.5px solid var(--border-strong); border-radius: var(--radius-md);
  padding: 16px 18px; cursor: pointer; text-align: left;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.landing-shortcut-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.landing-shortcut-card .title { font-family: var(--font-display); font-weight: 600; font-size: 15px; }
.landing-shortcut-card .desc { font-size: 12px; color: var(--ink-dim); }

.landing-subject-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px; margin-bottom: 20px; }
.landing-subject-card {
  background: var(--bg-elev-1); border: 1.5px solid var(--border-strong); border-radius: var(--radius-md);
  padding: 15px 18px; cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.landing-subject-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.landing-subject-card .code { font-size: 10.5px; font-weight: 700; color: var(--accent); letter-spacing: 0.04em; text-transform: uppercase; }
.landing-subject-card .title { font-family: var(--font-display); font-weight: 600; font-size: 14.5px; margin: 3px 0 10px; }
.landing-subject-card .roadmap-bar-track { width: 100%; }

.subject-view { max-width: 1040px; margin: 0 auto; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px);} to { opacity: 1; transform: none; } }

/* Hero */
.subject-hero {
  background: var(--accent);
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 30px 34px;
  margin-bottom: 18px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-2);
}
.subject-hero::after {
  content: '';
  position: absolute; inset: 0;
  background-image: radial-gradient(circle at 1.5px 1.5px, rgba(255,255,255,0.16) 1px, transparent 0);
  background-size: 16px 16px;
  pointer-events: none;
}
.subject-hero-inner { position: relative; display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.subject-code {
  font-size: 12px; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent-ink); opacity: 0.85; margin-bottom: 6px;
}
.subject-hero h1 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 600;
  font-size: 34px;
  line-height: 1.08;
  margin: 0;
  color: var(--accent-ink);
  letter-spacing: -0.01em;
  text-wrap: balance;
}
.subject-hero-progress {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 15px;
  color: var(--accent-ink);
  background: rgba(0,0,0,0.14);
  border: 1.5px solid rgba(255,255,255,0.4);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  flex-shrink: 0;
}

.banner {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  margin-bottom: 18px;
  border: 1.5px solid transparent;
}
.banner-warn { background: var(--warn-dim); color: var(--warn); border-color: color-mix(in srgb, var(--warn) 35%, transparent); }

.tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 24px;
  overflow-x: auto;
  padding-bottom: 2px;
}
.tab {
  background: var(--bg-elev-1);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-dim);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}
.tab:hover { color: var(--ink); border-color: var(--border-strong); }
.tab.active { color: var(--accent-ink); background: var(--ink); border-color: var(--border-strong); }
html[data-theme="dark"] .tab.active { color: var(--bg); background: var(--ink); }

.panel { display: none; animation: fadeIn 0.2s ease; }
.panel.active { display: block; }

/* Cards & shared components */
.card {
  background: var(--bg-elev-1);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  box-shadow: var(--shadow-1);
}
.grid-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
  margin-bottom: 26px;
}
.stat-card {
  background: var(--bg-elev-1);
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); }
.stat-card .num { font-family: var(--font-display); font-size: 26px; font-weight: 600; letter-spacing: -0.01em; }
.stat-card .label { font-size: 12px; color: var(--ink-dim); margin-top: 2px; font-weight: 500; }

.unit-card {
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  background: var(--bg-elev-1);
  overflow: hidden;
  transition: box-shadow 0.15s ease;
}
.unit-card.open { box-shadow: var(--shadow-1); }
.unit-head {
  display: flex; align-items: center; gap: 12px;
  padding: 15px 18px;
  cursor: pointer;
  user-select: none;
}
.unit-head:hover { background: var(--bg-elev-2); }
.unit-head .chev { color: var(--ink-faint); transition: transform 0.15s ease; font-size: 11px; }
.unit-card.open .unit-head .chev { transform: rotate(90deg); color: var(--accent); }
.unit-head .unit-name { font-family: var(--font-display); font-weight: 600; font-size: 15.5px; flex: 1; }
.unit-head .unit-title { font-weight: 400; font-style: italic; color: var(--ink-dim); }

.status-pill {
  font-size: 11px; font-weight: 700; padding: 5px 12px; border-radius: var(--radius-pill);
  border: 1.5px solid var(--border); background: var(--bg-elev-2); color: var(--ink-dim);
  cursor: pointer;
  transition: transform 0.1s ease;
}
.status-pill:active { transform: scale(0.95); }
.status-pill[data-status="done"] { background: var(--good-dim); color: var(--good); border-color: transparent; }
.status-pill[data-status="in-progress"] { background: var(--warn-dim); color: var(--warn); border-color: transparent; }
.status-pill[data-status="not-started"] { background: var(--bg-elev-2); color: var(--ink-faint); }

.unit-body { padding: 4px 18px 18px 18px; display: none; }
.unit-card.open .unit-body { display: block; }
.topic-row { padding: 11px 0; border-top: 1.5px solid var(--border-soft); font-size: 13.5px; line-height: 1.55; color: var(--ink-dim); display:flex; gap:10px; align-items:flex-start; }
.topic-row:first-child { border-top: none; }
.topic-row .topic-header { color: var(--ink); font-weight: 700; flex-shrink: 0; min-width: 160px; }
.topic-row .topic-actions { margin-left: auto; flex-shrink: 0; }
.topic-row .prompt-mini { border: 1.5px solid var(--border); background: var(--bg-elev-1); color: var(--ink-dim); cursor: pointer; font-size: 11.5px; font-weight: 600; padding: 4px 10px; border-radius: var(--radius-pill); }
.topic-row .prompt-mini:hover { color: var(--accent-ink); background: var(--accent); border-color: var(--border-strong); }

/* Buttons */
.btn-primary, .btn-ghost, .btn-danger {
  border-radius: var(--radius-pill);
  padding: 10px 18px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  border: 1.5px solid var(--border-strong);
  transition: transform 0.1s ease, background 0.15s ease, opacity 0.15s ease;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { opacity: 0.9; }
.btn-primary:active { transform: scale(0.97); }
.btn-primary:disabled { opacity: 0.5; cursor: default; }
.btn-ghost { background: var(--bg-elev-1); color: var(--ink); border-color: var(--border); }
.btn-ghost:hover { background: var(--bg-elev-2); border-color: var(--border-strong); }
.btn-danger { background: transparent; color: var(--danger); border-color: transparent; }
.btn-danger:hover { background: var(--danger-dim); }

/* Lecture log table */
.log-toolbar { display: flex; gap: 10px; margin-bottom: 14px; align-items: center; }
.log-toolbar .spacer { flex: 1; }
table.log-table {
  width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13.5px;
  border: 1.5px solid var(--border-strong); border-radius: var(--radius-md); overflow: hidden;
  background: var(--bg-elev-1);
}
table.log-table th {
  text-align: left; font-size: 11px; text-transform: uppercase; letter-spacing: 0.05em; font-weight: 700;
  color: var(--ink-dim); padding: 10px 12px; border-bottom: 1.5px solid var(--border-strong);
  background: var(--bg-elev-2);
}
table.log-table td {
  padding: 0; border-bottom: 1px solid var(--border-soft);
  vertical-align: top;
}
table.log-table tr:last-child td { border-bottom: none; }
table.log-table td[contenteditable], table.log-table td input, table.log-table td select {
  width: 100%; box-sizing: border-box; padding: 10px 12px; font-size: 13.5px;
  color: var(--ink); background: transparent; border: none; outline: none; font-family: inherit;
}
table.log-table td[contenteditable]:focus, table.log-table tr:hover td { background: var(--accent-glow); }
table.log-table select { appearance: none; cursor: pointer; }
table.log-table .row-actions { width: 36px; text-align: center; }
table.log-table .row-actions button { background: none; border: none; color: var(--ink-faint); cursor: pointer; font-size: 15px; padding: 6px; }
table.log-table .row-actions button:hover { color: var(--danger); }

/* Notes */
.notes-layout { display: grid; grid-template-columns: 220px 1fr; gap: 20px; }
.notes-list { display: flex; flex-direction: column; gap: 4px; }
.note-item { padding: 8px 10px; border-radius: var(--radius-sm); font-size: 13px; cursor: pointer; color: var(--ink-dim); display:flex; justify-content: space-between; align-items:center; gap: 6px;}
.note-item:hover { background: var(--bg-elev-2); }
.note-item.active { background: var(--accent); color: var(--accent-ink); }
.note-item .del { opacity: 0; color: var(--ink-faint); font-size: 12px; }
.note-item:hover .del { opacity: 1; }
.note-item.active .del { color: var(--accent-ink); opacity: 0.7; }
.note-item .del:hover { color: var(--danger) !important; opacity: 1; }
.markdown-body { font-size: 14px; line-height: 1.7; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 { font-family: var(--font-display); line-height: 1.3; }
.markdown-body pre { background: var(--bg-elev-2); padding: 12px 14px; border-radius: var(--radius-sm); overflow-x: auto; font-family: var(--font-mono); font-size: 13px; border: 1px solid var(--border-soft); }
.markdown-body code { font-family: var(--font-mono); background: var(--bg-elev-2); padding: 2px 5px; border-radius: 4px; font-size: 0.9em; }
.markdown-body pre code { background: none; padding: 0; }
.upload-zone {
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-md);
  padding: 22px;
  text-align: center;
  color: var(--ink-faint);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
  margin-bottom: 14px;
}
.upload-zone:hover, .upload-zone.drag { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }

/* Prompt generator */
.prompt-scope { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.prompt-scope select { background: var(--bg-elev-1); border: 1.5px solid var(--border-strong); color: var(--ink); padding: 9px 12px; border-radius: var(--radius-pill); font-size: 13px; font-weight: 600; }
.prompt-output {
  width: 100%; min-height: 220px;
  background: var(--bg-elev-1); border: 1.5px solid var(--border-strong); border-radius: var(--radius-md);
  padding: 16px; color: var(--ink); font-family: var(--font-mono); font-size: 12.5px; line-height: 1.6;
  resize: vertical;
}
.prompt-actions { display: flex; gap: 10px; margin-top: 12px; }
.run-result { margin-top: 20px; }
.run-result h3 { font-family: var(--font-display); font-size: 15px; color: var(--ink); font-weight: 600; margin-bottom: 10px; }
.run-result-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.run-result-head h3 { margin-bottom: 0; }
.run-result-head .btn-ghost { padding: 7px 14px; font-size: 12.5px; border-radius: var(--radius-sm); }
.run-result-head .btn-ghost:disabled { opacity: 0.6; cursor: default; }
.run-result .banner { margin-bottom: 12px; }

/* Modal */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(36,28,20,0.45);
  display: flex; align-items: center; justify-content: center; z-index: 50;
  backdrop-filter: blur(2px);
}
.modal-overlay[hidden] { display: none; }
.modal {
  background: var(--bg-elev-1); border: 2px solid var(--border-strong);
  border-radius: var(--radius-lg); padding: 28px; width: 420px; max-width: 90vw;
  box-shadow: var(--shadow-2);
  animation: fadeIn 0.15s ease;
}
.modal h2 { font-family: var(--font-display); margin: 0 0 10px; font-size: 20px; font-weight: 600; }
.modal-hint { font-size: 12.5px; color: var(--ink-dim); line-height: 1.5; margin-bottom: 18px; }
#modelHint { font-size: 12px; color: var(--ink-dim); line-height: 1.4; margin: 0; font-weight: 400; }
.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; font-size: 13px; }
.field span { color: var(--ink-dim); font-weight: 600; }
.field input, .field select {
  background: var(--bg-elev-2); border: 1.5px solid var(--border); color: var(--ink);
  padding: 9px 12px; border-radius: var(--radius-sm); font-size: 13.5px; font-family: inherit;
}
.field input:focus, .field select:focus { outline: none; border-color: var(--accent); }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--ink); border: 1.5px solid var(--border-strong); color: var(--bg);
  padding: 11px 20px; border-radius: var(--radius-pill); font-size: 13px; font-weight: 600; box-shadow: var(--shadow-2);
  z-index: 100;
  animation: fadeIn 0.15s ease;
}

.empty-hint { color: var(--ink-faint); font-size: 13px; padding: 20px 0; }
.section-title { font-family: var(--font-display); font-size: 15px; color: var(--ink); font-weight: 600; font-style: italic; margin: 28px 0 12px; }
.section-title:first-child { margin-top: 0; }
.kv-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 10px; }
.kv-item { background: var(--bg-elev-1); border: 1.5px solid var(--border-strong); border-radius: var(--radius-sm); padding: 12px 14px; }
.kv-item .k { font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.04em; font-weight: 600; }
.kv-item .v { font-family: var(--font-display); font-size: 16px; font-weight: 600; margin-top: 2px; }

.week-block { border-top: 1.5px solid var(--border-soft); padding: 12px 0; }
.week-block:first-child { border-top: none; }
.week-block .week-title { font-family: var(--font-display); font-weight: 600; font-size: 14px; margin-bottom: 8px; }
.lecture-item { font-size: 13px; color: var(--ink-dim); padding: 4px 0; }
.lecture-item b { color: var(--ink); }

/* DSA Sheet */
.dsa-view { max-width: 1040px; margin: 0 auto; animation: fadeIn 0.25s ease; }
.dsa-view[hidden] { display: none; }
.dsa-toolbar { display: flex; gap: 10px; align-items: center; margin-bottom: 18px; flex-wrap: wrap; }
.dsa-toolbar .spacer { flex: 1; }
.dsa-search {
  background: var(--bg-elev-1); border: 1.5px solid var(--border-strong); color: var(--ink);
  padding: 9px 14px; border-radius: var(--radius-pill); font-size: 13px; font-family: inherit;
  min-width: 220px; flex: 1;
}
.dsa-search:focus { outline: none; border-color: var(--accent); }
.dsa-toolbar select {
  background: var(--bg-elev-1); border: 1.5px solid var(--border-strong); color: var(--ink);
  padding: 9px 12px; border-radius: var(--radius-pill); font-size: 13px; font-weight: 600; font-family: inherit;
}

.dsa-section { border: 1.5px solid var(--border-strong); border-radius: var(--radius-md); margin-bottom: 12px; background: var(--bg-elev-1); overflow: hidden; }
.dsa-section-head { display: flex; align-items: center; gap: 12px; padding: 15px 18px; cursor: pointer; user-select: none; }
.dsa-section-head:hover { background: var(--bg-elev-2); }
.dsa-section-head .chev { color: var(--ink-faint); transition: transform 0.15s ease; font-size: 11px; }
.dsa-section.open .dsa-section-head .chev { transform: rotate(90deg); color: var(--accent); }
.dsa-section-head .name { font-family: var(--font-display); font-weight: 600; font-size: 15.5px; flex: 1; }
.dsa-section-head .count { font-size: 11.5px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--ink-dim); background: var(--bg-elev-2); border: 1.5px solid var(--border); padding: 5px 12px; border-radius: var(--radius-pill); }
.dsa-section-body { display: none; padding: 4px 18px 16px; }
.dsa-section.open .dsa-section-body { display: block; }

.dsa-subcat { padding-top: 14px; }
.dsa-subcat-name { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-faint); margin-bottom: 8px; }

.dsa-row {
  display: flex; align-items: center; gap: 12px;
  padding: 9px 0;
  border-top: 1px solid var(--border-soft);
}
.dsa-subcat .dsa-row:first-of-type { border-top: none; }
.dsa-check {
  width: 19px; height: 19px; flex-shrink: 0;
  border: 1.5px solid var(--border-strong); border-radius: 6px;
  background: var(--bg-elev-1);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--accent-ink);
  transition: background 0.12s ease, border-color 0.12s ease;
}
.dsa-check:hover { border-color: var(--accent); }
.dsa-check.done { background: var(--good); border-color: var(--good); }
.dsa-name { flex: 1; font-size: 13.5px; color: var(--ink); min-width: 0; }
.dsa-row.done .dsa-name { color: var(--ink-faint); text-decoration: line-through; }
.dsa-diff { font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.03em; padding: 3px 9px; border-radius: var(--radius-pill); flex-shrink: 0; }
.dsa-diff.easy { background: var(--good-dim); color: var(--good); }
.dsa-diff.medium { background: var(--warn-dim); color: var(--warn); }
.dsa-diff.hard { background: var(--danger-dim); color: var(--danger); }
.dsa-links { display: flex; gap: 4px; flex-shrink: 0; }
.dsa-links a {
  font-size: 11px; font-weight: 600; color: var(--ink-dim);
  border: 1.5px solid var(--border); border-radius: var(--radius-pill);
  padding: 4px 9px; text-decoration: none;
  transition: color 0.12s ease, border-color 0.12s ease, background 0.12s ease;
}
.dsa-links a:hover { color: var(--accent-ink); background: var(--accent); border-color: var(--border-strong); }

/* Planner */
.planner-view { max-width: 1040px; margin: 0 auto; animation: fadeIn 0.25s ease; }
.planner-view[hidden] { display: none; }

.heatmap-card { margin-bottom: 8px; }
.heatmap-scroll { overflow-x: auto; padding-bottom: 4px; }
.heatmap-months {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 13px;
  gap: 3px;
  font-size: 10.5px;
  color: var(--ink-faint);
  margin-bottom: 4px;
  min-width: max-content;
  height: 14px;
}
.heatmap-grid {
  display: grid;
  grid-template-rows: repeat(7, 11px);
  grid-auto-flow: column;
  grid-auto-columns: 11px;
  gap: 3px;
  min-width: max-content;
}
.heatmap-cell {
  width: 11px; height: 11px;
  border-radius: 3px;
  background: var(--bg-elev-2);
  border: 1px solid var(--border-soft);
  display: inline-block;
}
.heatmap-cell[data-level="1"] { background: color-mix(in srgb, var(--accent) 30%, var(--bg-elev-2)); border-color: transparent; }
.heatmap-cell[data-level="2"] { background: color-mix(in srgb, var(--accent) 55%, var(--bg-elev-2)); border-color: transparent; }
.heatmap-cell[data-level="3"] { background: color-mix(in srgb, var(--accent) 78%, var(--bg-elev-2)); border-color: transparent; }
.heatmap-cell[data-level="4"] { background: var(--accent); border-color: transparent; }
.heatmap-legend { display: flex; align-items: center; gap: 5px; margin-top: 12px; font-size: 11px; color: var(--ink-faint); }
.heatmap-legend .heatmap-cell { cursor: default; }

.planner-grid { display: grid; grid-template-columns: 1.15fr 1fr; gap: 26px; align-items: start; }

.cal-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 12px; }
.cal-label { font-family: var(--font-display); font-weight: 600; font-size: 15px; }
.cal-weekdays { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; margin-bottom: 6px; }
.cal-weekdays span { text-align: center; font-size: 10.5px; font-weight: 700; color: var(--ink-faint); text-transform: uppercase; }
.cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.cal-day {
  aspect-ratio: 1; display: flex; flex-direction: column; align-items: center; justify-content: center;
  border-radius: var(--radius-sm); font-size: 12.5px; cursor: pointer; position: relative;
  border: 1.5px solid transparent; color: var(--ink);
  transition: background 0.12s ease, border-color 0.12s ease;
}
.cal-day:hover { background: var(--bg-elev-2); }
.cal-day.other-month { color: var(--ink-faint); opacity: 0.45; }
.cal-day.today { border-color: var(--accent); font-weight: 700; }
.cal-day.selected { background: var(--accent); color: var(--accent-ink); font-weight: 700; }
.cal-day .cal-dot { width: 4px; height: 4px; border-radius: 50%; background: var(--accent); margin-top: 2px; }
.cal-day.selected .cal-dot { background: var(--accent-ink); }

.roadmap-row { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-top: 1px solid var(--border-soft); cursor: pointer; }
.roadmap-row:first-child { border-top: none; }
.roadmap-row:hover .roadmap-title { color: var(--accent); }
.roadmap-code { font-size: 10.5px; font-weight: 700; color: var(--ink-faint); letter-spacing: 0.03em; width: 56px; flex-shrink: 0; }
.roadmap-title { font-size: 13px; font-weight: 600; flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; transition: color 0.12s ease; }
.roadmap-bar-track { width: 90px; height: 6px; border-radius: var(--radius-pill); background: var(--bg-elev-3); overflow: hidden; flex-shrink: 0; }
.roadmap-bar-fill { height: 100%; background: var(--accent); border-radius: var(--radius-pill); }
.roadmap-pct { font-size: 11.5px; font-weight: 700; color: var(--ink-dim); width: 34px; text-align: right; flex-shrink: 0; font-variant-numeric: tabular-nums; }

.planner-add-row { display: flex; gap: 8px; margin-bottom: 14px; }
.planner-add-row input {
  flex: 1; background: var(--bg-elev-2); border: 1.5px solid var(--border); color: var(--ink);
  padding: 9px 12px; border-radius: var(--radius-sm); font-size: 13.5px; font-family: inherit;
}
.planner-add-row input:focus { outline: none; border-color: var(--accent); }
.planner-task-item { display: flex; align-items: center; gap: 10px; padding: 9px 0; border-top: 1px solid var(--border-soft); }
.planner-task-item:first-child { border-top: none; }
.planner-task-item .dsa-check { flex-shrink: 0; }
.planner-task-item .task-text { flex: 1; font-size: 13.5px; color: var(--ink); min-width: 0; word-break: break-word; }
.planner-task-item.done .task-text { color: var(--ink-faint); text-decoration: line-through; }
.planner-task-item .task-del { background: none; border: none; color: var(--ink-faint); cursor: pointer; font-size: 14px; padding: 4px; flex-shrink: 0; }
.planner-task-item .task-del:hover { color: var(--danger); }

@media (max-width: 860px) {
  .topbar { flex-wrap: wrap; }
  .subject-strip { order: 3; width: 100%; }
  .main { padding: 24px 18px; }
  .subject-hero h1 { font-size: 26px; }
  .dsa-row { flex-wrap: wrap; }
  .dsa-links { width: 100%; padding-left: 31px; }
  .planner-grid { grid-template-columns: 1fr; }
}