/* ============================================================
   PrepaOS — style.css
   Design : "Cahier Nocturne" — carnet de prépa scientifique.
   Grille de papier millimétré en filigrane + anneaux gradués
   façon rapporteur, glassmorphism, dégradés doux par matière.
   ============================================================ */

/* ---------- 1. TOKENS ---------- */
:root{
  --bg:            #0B0E1A;
  --bg-alt:        #0F1424;
  --grid-line:     rgba(255,255,255,0.035);
  --surface:       rgba(255,255,255,0.055);
  --surface-2:     rgba(255,255,255,0.09);
  --border:        rgba(255,255,255,0.10);
  --border-strong: rgba(255,255,255,0.18);
  --text:          #EEF0FA;
  --text-muted:    #8A90AC;
  --text-dim:      #5D6280;

  --indigo:  #6C6FF0;
  --violet:  #9B6BF2;
  --amber:   #F0A860;
  --emerald: #4FD1A5;
  --cyan:    #4FC3E0;
  --rose:    #F0709B;

  --success: #4FD1A5;
  --danger:  #F0708A;
  --accent:  var(--indigo);

  --font-display: "Iowan Old Style","Palatino Linotype","Book Antiqua",Georgia,serif;
  --font-body: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-mono: ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --shadow-soft: 0 10px 30px -12px rgba(0,0,0,0.55);
  --shadow-deep: 0 24px 60px -20px rgba(0,0,0,0.65);
  --blur: blur(18px);

  --ease: cubic-bezier(.22,.9,.32,1);
}

[data-theme="light"]{
  --bg: #F4F5FA;
  --bg-alt: #EAECF5;
  --grid-line: rgba(20,20,40,0.045);
  --surface: rgba(255,255,255,0.65);
  --surface-2: rgba(255,255,255,0.85);
  --border: rgba(20,20,40,0.09);
  --border-strong: rgba(20,20,40,0.16);
  --text: #191B29;
  --text-muted: #5A5F78;
  --text-dim: #8A90AC;
  --shadow-soft: 0 10px 30px -14px rgba(30,30,60,0.25);
  --shadow-deep: 0 24px 60px -20px rgba(30,30,60,0.3);
}

[data-theme="galaxy"]{
  --bg: #0A0620;
  --bg-alt: #120A32;
  --grid-line: rgba(190,150,255,0.05);
  --surface: rgba(150,110,255,0.09);
  --surface-2: rgba(150,110,255,0.15);
  --border: rgba(190,150,255,0.16);
  --border-strong: rgba(190,150,255,0.28);
  --text: #F1ECFF;
  --text-muted: #A79BD6;
  --indigo:#8B7CF6; --violet:#C084FC; --amber:#FBBF7A; --emerald:#5EEAD4; --cyan:#67E8F9; --rose:#F472B6;
  --accent: var(--violet);
}

[data-theme="cyberpunk"]{
  --bg: #0A0014;
  --bg-alt: #12001F;
  --grid-line: rgba(0,255,220,0.05);
  --surface: rgba(255,0,170,0.07);
  --surface-2: rgba(0,255,220,0.10);
  --border: rgba(0,255,220,0.22);
  --border-strong: rgba(255,0,170,0.35);
  --text: #F2FBFF;
  --text-muted: #9FB7C4;
  --indigo:#00F0FF; --violet:#FF2FD0; --amber:#FFD23F; --emerald:#2CFFB0; --cyan:#00F0FF; --rose:#FF2FD0;
  --accent: var(--rose);
}

[data-theme="ocean"]{
  --bg: #061A22;
  --bg-alt: #08222E;
  --grid-line: rgba(120,220,255,0.045);
  --surface: rgba(90,200,255,0.07);
  --surface-2: rgba(90,200,255,0.12);
  --border: rgba(120,220,255,0.16);
  --border-strong: rgba(120,220,255,0.28);
  --text: #E8FBFF;
  --text-muted: #8FB9C6;
  --indigo:#4FC3E0; --violet:#5AD1C9; --amber:#F2C879; --emerald:#4FD1A5; --cyan:#4FC3E0; --rose:#7FB0F0;
  --accent: var(--cyan);
}

[data-theme="forest"]{
  --bg: #0C1710;
  --bg-alt: #101F15;
  --grid-line: rgba(150,220,150,0.045);
  --surface: rgba(120,200,140,0.07);
  --surface-2: rgba(120,200,140,0.12);
  --border: rgba(150,220,150,0.16);
  --border-strong: rgba(150,220,150,0.28);
  --text: #EAF5EA;
  --text-muted: #92AF95;
  --indigo:#79C689; --violet:#A9D18E; --amber:#E3B45C; --emerald:#4FD1A5; --cyan:#6FBFA0; --rose:#D18E7B;
  --accent: var(--emerald);
}

/* ---------- 2. RESET / BASE ---------- */
[hidden]{ display:none !important; }
*,*::before,*::after{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  background:
    radial-gradient(1100px 700px at 85% -10%, color-mix(in srgb, var(--indigo) 14%, transparent), transparent),
    radial-gradient(900px 600px at -10% 110%, color-mix(in srgb, var(--violet) 10%, transparent), transparent),
    repeating-linear-gradient(0deg, var(--grid-line) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 34px),
    var(--bg);
  color:var(--text);
  font-family:var(--font-body);
  -webkit-font-smoothing:antialiased;
  transition:background-color .4s var(--ease), color .4s var(--ease);
}
a{ color:inherit; }
button{ font-family:inherit; }
h1,h2,h3{ font-family:var(--font-display); font-weight:600; margin:0 0 .3em; letter-spacing:.2px; }
kbd{ background:var(--surface-2); border:1px solid var(--border-strong); border-radius:5px; padding:1px 6px; font-family:var(--font-mono); font-size:.78em; }
.muted{ color:var(--text-muted); }
.visually-hidden{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); }
.skip-link{ position:absolute; left:-999px; top:0; background:var(--accent); color:#fff; padding:10px 16px; z-index:999; border-radius:0 0 8px 0; }
.skip-link:focus{ left:0; }
:focus-visible{ outline:2px solid var(--accent); outline-offset:2px; border-radius:6px; }

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{ animation-duration:.001ms !important; transition-duration:.001ms !important; }
}

/* ---------- 3. GLASS SURFACE ---------- */
.glass{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  backdrop-filter:var(--blur);
  -webkit-backdrop-filter:var(--blur);
  box-shadow:var(--shadow-soft);
}

/* ---------- 4. LAYOUT SHELL ---------- */
.app-shell{ display:flex; min-height:100vh; }

.sidebar{
  width:236px; flex-shrink:0; padding:22px 14px;
  display:flex; flex-direction:column; gap:22px;
  border-right:1px solid var(--border);
  background:color-mix(in srgb, var(--bg-alt) 70%, transparent);
  position:sticky; top:0; height:100vh;
}
.brand{ display:flex; align-items:center; gap:10px; padding:0 8px; color:var(--accent); }
.brand-text{ font-family:var(--font-display); font-size:1.25rem; color:var(--text); }
.brand-text.small{ font-size:1.05rem; }
.brand-text b{ color:var(--accent); }

.nav{ display:flex; flex-direction:column; gap:4px; }
.nav-item{
  display:flex; align-items:center; gap:12px;
  background:transparent; border:1px solid transparent; color:var(--text-muted);
  padding:10px 12px; border-radius:var(--radius-sm); cursor:pointer;
  font-size:.94rem; text-align:left; transition:background .25s var(--ease), color .2s, transform .15s;
}
.nav-item:hover{ background:var(--surface); color:var(--text); transform:translateX(2px); }
.nav-item.is-active{ background:var(--surface-2); color:var(--text); border-color:var(--border-strong); box-shadow:inset 0 0 0 1px transparent; }
.nav-item.is-active .nav-ic{ color:var(--accent); }
.nav-ic{ font-size:1.05rem; width:20px; text-align:center; }

.sidebar-foot{ margin-top:auto; display:flex; flex-direction:column; gap:8px; }
.streak-pill{
  display:flex; align-items:center; gap:6px; background:var(--surface); border:1px solid var(--border);
  border-radius:999px; padding:8px 12px; font-family:var(--font-mono); font-size:.85rem; width:fit-content;
}
.exam-countdown{ font-size:.78rem; color:var(--text-dim); padding:0 4px; }

.topbar{
  display:none; align-items:center; justify-content:space-between;
  padding:12px 16px; border-bottom:1px solid var(--border);
  position:sticky; top:0; z-index:20; background:color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter:var(--blur);
}
.icon-btn{
  background:var(--surface); border:1px solid var(--border); color:var(--text);
  width:38px; height:38px; border-radius:12px; cursor:pointer; font-size:1.05rem;
  display:flex; align-items:center; justify-content:center; transition:background .2s, transform .15s;
}
.icon-btn:hover{ background:var(--surface-2); transform:translateY(-1px); }

.main{ flex:1; padding:28px 32px 80px; max-width:1180px; margin:0 auto; width:100%; }

/* ---------- 5. COMMAND BAR ---------- */
.command-bar{ display:flex; gap:14px; flex-wrap:wrap; align-items:center; margin-bottom:26px; }
.search-wrap{ position:relative; flex:1; min-width:240px; }
.search-ic{ position:absolute; left:14px; top:50%; transform:translateY(-50%); color:var(--text-dim); }
#globalSearch{
  width:100%; padding:12px 14px 12px 38px; border-radius:14px; border:1px solid var(--border);
  background:var(--surface); color:var(--text); font-size:.94rem; outline:none;
  transition:border-color .2s, box-shadow .2s;
}
#globalSearch:focus{ border-color:var(--accent); box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent); }
.filter-chips{ display:flex; gap:8px; flex-wrap:wrap; }
.chip{
  border:1px solid var(--border); background:var(--surface); color:var(--text-muted);
  padding:9px 15px; border-radius:999px; cursor:pointer; font-size:.85rem; transition:all .2s var(--ease);
}
.chip:hover{ color:var(--text); }
.chip.is-active{ background:var(--accent); border-color:var(--accent); color:#0B0E1A; font-weight:600; }

/* ---------- 6. VIEWS ---------- */
.view{ display:none; animation:fadeUp .45s var(--ease); }
.view.is-active{ display:block; }
@keyframes fadeUp{ from{ opacity:0; transform:translateY(10px);} to{ opacity:1; transform:none; } }

.view-header{ display:flex; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap; margin-bottom:18px; }
.section-title{ font-size:1.3rem; margin:26px 0 14px; }
.view-header .section-title{ margin:0; }

/* ---------- 7. HERO / DASHBOARD ---------- */
.hero{ display:flex; align-items:center; justify-content:space-between; gap:26px; padding:30px 34px; margin-bottom:22px; flex-wrap:wrap; }
.eyebrow{ text-transform:uppercase; letter-spacing:1.6px; font-size:.72rem; color:var(--text-dim); margin:0 0 6px; }
.hero-left h1{ font-size:1.9rem; margin:0 0 8px; }
.quote{ color:var(--text-muted); font-style:italic; max-width:46ch; }

.ring-block{ position:relative; width:160px; height:160px; }
.ring-svg{ width:100%; height:100%; transform:rotate(-90deg); }
.ring-svg.lg{ width:220px; height:220px; }
.ring-track{ fill:none; stroke:var(--border); stroke-width:12; }
.ring-bar{
  fill:none; stroke:var(--accent); stroke-width:12; stroke-linecap:round;
  stroke-dasharray:427; stroke-dashoffset:427; transition:stroke-dashoffset 1s var(--ease);
}
.ring-center{ position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center; }
.ring-pct{ font-family:var(--font-display); font-size:1.7rem; }
.ring-label{ font-size:.72rem; color:var(--text-dim); text-transform:uppercase; letter-spacing:1px; }

.stat-row{ display:grid; grid-template-columns:repeat(4,1fr); gap:14px; margin-bottom:8px; }
.stat-row.two{ grid-template-columns:repeat(2,1fr); }
.stat-card{ padding:18px 20px; display:flex; flex-direction:column; gap:4px; transition:transform .25s var(--ease); }
.stat-card:hover{ transform:translateY(-3px); }
.stat-num{ font-family:var(--font-display); font-size:1.9rem; }
.stat-num-sm{ font-family:var(--font-display); font-size:1.15rem; }
.stat-label{ color:var(--text-muted); font-size:.82rem; }
.accent-ok{ color:var(--success); }
.accent-warn{ color:var(--amber); }

/* ---------- 8. SUBJECT CARDS ---------- */
.subject-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(230px,1fr)); gap:16px; }
.subject-card{
  position:relative; padding:20px; cursor:pointer; overflow:hidden;
  transition:transform .28s var(--ease), box-shadow .28s var(--ease);
  border:1px solid var(--border);
}
.subject-card::before{
  content:""; position:absolute; inset:0; opacity:.16; pointer-events:none;
  background:radial-gradient(120px 120px at 90% -10%, var(--sc), transparent 70%);
}
.subject-card:hover{ transform:translateY(-5px); box-shadow:var(--shadow-deep); }
.subject-top{ display:flex; align-items:center; justify-content:space-between; margin-bottom:14px; }
.subject-icon{ width:42px; height:42px; border-radius:12px; display:flex; align-items:center; justify-content:center; font-size:1.3rem; background:color-mix(in srgb, var(--sc) 25%, transparent); }
.subject-name{ font-family:var(--font-display); font-size:1.06rem; margin:0 0 2px; }
.subject-meta{ font-size:.78rem; color:var(--text-muted); }
.mini-ring{ width:44px; height:44px; }
.mini-ring circle{ fill:none; stroke-width:5; }
.mini-ring .track{ stroke:var(--border); }
.mini-ring .bar{ stroke:var(--sc); stroke-linecap:round; transition:stroke-dashoffset .8s var(--ease); }
.subject-bar-track{ height:6px; border-radius:99px; background:var(--border); overflow:hidden; margin-top:14px; }
.subject-bar-fill{ height:100%; background:var(--sc); border-radius:99px; transition:width .8s var(--ease); }

/* ---------- 9. CHAPTER LIST ---------- */
.chapter-list{ display:flex; flex-direction:column; gap:10px; }
.chapter-row{
  display:flex; align-items:center; gap:14px; padding:14px 16px; border-radius:var(--radius-md);
  border:1px solid var(--border); background:var(--surface); transition:background .2s, transform .2s;
}
.chapter-row:hover{ background:var(--surface-2); }
.chapter-row.is-done{ opacity:.75; }
.check{
  width:24px; height:24px; border-radius:8px; border:2px solid var(--border-strong); flex-shrink:0; cursor:pointer;
  display:flex; align-items:center; justify-content:center; color:transparent; font-size:.85rem;
  transition:all .2s var(--ease); background:transparent;
}
.check.checked{ background:var(--success); border-color:var(--success); color:#0B0E1A; animation:pop .35s var(--ease); }
@keyframes pop{ 0%{ transform:scale(.6);} 60%{ transform:scale(1.15);} 100%{ transform:scale(1);} }
.chapter-main{ flex:1; min-width:0; cursor:pointer; }
.chapter-name{ font-size:.96rem; }
.chapter-name.strike{ text-decoration:line-through; color:var(--text-dim); }
.chapter-sub{ font-size:.76rem; color:var(--text-dim); }
.level-tag{ font-size:.72rem; padding:4px 10px; border-radius:999px; border:1px solid var(--border-strong); color:var(--text-muted); white-space:nowrap; }
.fav-btn{ background:none; border:none; font-size:1.1rem; cursor:pointer; color:var(--text-dim); transition:transform .2s, color .2s; }
.fav-btn.is-fav{ color:var(--amber); transform:scale(1.15); }

/* ---------- 10. MODAL ---------- */
.modal-overlay{
  position:fixed; inset:0; background:rgba(5,6,12,.55); backdrop-filter:blur(4px);
  display:flex; align-items:center; justify-content:center; z-index:100; padding:20px; animation:fadeIn .25s var(--ease);
}
.modal-overlay[hidden]{ display:none; }
@keyframes fadeIn{ from{ opacity:0;} to{ opacity:1;} }
.modal{
  width:100%; max-width:480px; padding:28px; position:relative; max-height:90vh; overflow-y:auto;
  display:flex; flex-direction:column; gap:10px; animation:modalIn .3s var(--ease);
}
@keyframes modalIn{ from{ opacity:0; transform:translateY(16px) scale(.97);} to{ opacity:1; transform:none;} }
.modal-close{ position:absolute; right:16px; top:16px; background:var(--surface-2); border:1px solid var(--border); width:32px; height:32px; border-radius:10px; cursor:pointer; color:var(--text); }
.modal label{ font-size:.8rem; color:var(--text-muted); margin-top:8px; }
.modal select, .modal input[type=text], .modal input[type=number], .modal input[type=date], .modal textarea{
  width:100%; padding:10px 12px; border-radius:10px; border:1px solid var(--border); background:var(--bg-alt); color:var(--text); font-family:inherit; font-size:.92rem; outline:none;
}
.modal select:focus, .modal input:focus, .modal textarea:focus{ border-color:var(--accent); }
.switch-row{ display:flex; align-items:center; gap:8px; font-size:.9rem; color:var(--text); }
.notes-preview{ font-size:.85rem; color:var(--text-muted); border-top:1px dashed var(--border); padding-top:8px; margin-top:4px; min-height:1em; }
.notes-preview b{ color:var(--text); }

/* ---------- 11. BUTTONS ---------- */
.btn{
  border:1px solid var(--border-strong); background:var(--surface); color:var(--text);
  padding:10px 16px; border-radius:12px; cursor:pointer; font-size:.86rem; transition:all .2s var(--ease);
}
.btn:hover{ background:var(--surface-2); transform:translateY(-1px); }
.btn.primary{ background:var(--accent); border-color:var(--accent); color:#0B0E1A; font-weight:600; }
.btn.primary:hover{ filter:brightness(1.08); }
.btn.ghost{ background:transparent; }
.btn.danger{ border-color:var(--danger); color:var(--danger); background:transparent; }
.btn.danger:hover{ background:color-mix(in srgb, var(--danger) 15%, transparent); }
.settings-actions{ display:flex; gap:10px; flex-wrap:wrap; margin-top:10px; }

/* ---------- 12. CHARTS / STATS PAGE ---------- */
.chart-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px; margin:16px 0; }
.chart-card{ padding:18px; }
.chart-card.wide{ grid-column:1 / -1; }
.chart-card h3{ font-size:.95rem; margin-bottom:12px; color:var(--text-muted); font-family:var(--font-body); font-weight:600; }
canvas{ max-width:100%; }

/* ---------- 13. CALENDAR ---------- */
.calendar-card{ padding:20px; }
.calendar-header{ display:flex; align-items:center; justify-content:space-between; margin-bottom:14px; }
.calendar-grid{ display:grid; grid-template-columns:repeat(7,1fr); gap:6px; }
.cal-cell{
  aspect-ratio:1; border-radius:8px; display:flex; align-items:center; justify-content:center;
  font-size:.78rem; color:var(--text-muted); background:var(--surface); border:1px solid transparent;
  transition:transform .15s;
}
.cal-cell.empty{ background:transparent; }
.cal-cell.done{ background:color-mix(in srgb, var(--success) 55%, var(--surface)); color:#08120e; font-weight:700; }
.cal-cell.today{ border-color:var(--accent); }
.cal-cell:hover{ transform:scale(1.08); }
.cal-dow{ text-align:center; font-size:.7rem; color:var(--text-dim); text-transform:uppercase; }

/* ---------- 14. GOALS ---------- */
.goal-list{ display:flex; flex-direction:column; gap:12px; }
.goal-card{ padding:16px 20px; display:flex; align-items:center; gap:16px; }
.goal-info{ flex:1; }
.goal-title{ font-size:.95rem; margin-bottom:6px; }
.goal-track{ height:8px; border-radius:99px; background:var(--border); overflow:hidden; }
.goal-fill{ height:100%; background:linear-gradient(90deg,var(--indigo),var(--violet)); border-radius:99px; transition:width .6s var(--ease); }
.goal-pct{ font-family:var(--font-mono); font-size:.82rem; color:var(--text-muted); min-width:60px; text-align:right; }
.goal-del{ background:none; border:none; color:var(--text-dim); cursor:pointer; font-size:1rem; }
.goal-del:hover{ color:var(--danger); }
.empty-state{ padding:40px 20px; text-align:center; color:var(--text-muted); }

/* ---------- 15. BADGES ---------- */
.badge-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(160px,1fr)); gap:14px; }
.badge-card{
  padding:18px; text-align:center; display:flex; flex-direction:column; align-items:center; gap:8px;
  filter:grayscale(1) opacity(.4); transition:all .3s var(--ease);
}
.badge-card.unlocked{ filter:none; opacity:1; box-shadow:0 0 0 1px var(--accent), var(--shadow-soft); }
.badge-icon{ font-size:2rem; }
.badge-name{ font-size:.84rem; font-weight:600; }
.badge-desc{ font-size:.72rem; color:var(--text-dim); }

/* ---------- 16. FOCUS / POMODORO ---------- */
.focus-wrap{ padding:36px; display:flex; flex-direction:column; align-items:center; gap:18px; max-width:460px; margin:0 auto; }
.focus-mode-switch{ display:flex; gap:8px; }
.focus-display{ position:relative; width:220px; height:220px; display:flex; align-items:center; justify-content:center; }
.focus-time{ position:absolute; font-family:var(--font-display); font-size:2.6rem; }
.focus-controls{ display:flex; gap:10px; }
.focus-settings{ display:flex; gap:16px; font-size:.82rem; color:var(--text-muted); }
.focus-settings input{ width:60px; margin-left:6px; padding:4px 6px; border-radius:6px; border:1px solid var(--border); background:var(--bg-alt); color:var(--text); }
.focus-count{ font-size:.85rem; color:var(--text-muted); }

/* ---------- 17. SETTINGS ---------- */
.settings-card{ padding:20px 22px; margin-bottom:16px; }
.theme-grid{ display:grid; grid-template-columns:repeat(auto-fill,minmax(90px,1fr)); gap:10px; }
.theme-swatch{
  border-radius:14px; padding:14px 8px; border:2px solid transparent; cursor:pointer; text-align:center;
  font-size:.76rem; color:var(--text); transition:transform .2s, border-color .2s;
}
.theme-swatch:hover{ transform:translateY(-2px); }
.theme-swatch.is-active{ border-color:var(--accent); }
.theme-dot{ width:26px; height:26px; border-radius:50%; margin:0 auto 6px; }
.shortcut-list{ list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:8px; font-size:.85rem; color:var(--text-muted); }

/* ---------- 18. TOAST ---------- */
.toast{
  position:fixed; bottom:24px; left:50%; transform:translate(-50%,20px); background:var(--surface-2);
  border:1px solid var(--border-strong); backdrop-filter:var(--blur); color:var(--text); padding:12px 20px;
  border-radius:14px; font-size:.86rem; opacity:0; pointer-events:none; transition:all .35s var(--ease); z-index:200;
  box-shadow:var(--shadow-deep);
}
.toast.show{ opacity:1; transform:translate(-50%,0); }

/* ---------- 19. CONFETTI ---------- */
#confettiCanvas{ position:fixed; inset:0; pointer-events:none; z-index:300; width:100vw; height:100vh; }

/* ---------- 20. RESPONSIVE ---------- */
@media (max-width:980px){
  .chart-grid{ grid-template-columns:1fr; }
  .stat-row{ grid-template-columns:repeat(2,1fr); }
}
@media (max-width:860px){
  .app-shell{ flex-direction:column; }
  .sidebar{ display:none; }
  .topbar{ display:flex; }
  .main{ padding:20px 16px 90px; }
  .sidebar.is-open{
    display:flex; position:fixed; z-index:50; top:0; left:0; box-shadow:var(--shadow-deep);
    animation:slideIn .25s var(--ease);
  }
  @keyframes slideIn{ from{ transform:translateX(-100%);} to{ transform:none;} }
}
@media (max-width:560px){
  .hero{ flex-direction:column; text-align:center; }
  .stat-row{ grid-template-columns:1fr 1fr; }
  .settings-actions{ flex-direction:column; }
}

/* ---------- 21. SUBJECT COLOR VARIABLES (assigned via inline style --sc) ---------- */
.subject-card, .mini-ring{ --sc: var(--indigo); }