*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#07090F;
  --bg2:#0D1220;
  --bg3:#111828;
  --panel:#151D2E;
  --panel2:#1A2338;
  --border:#1F2D45;
  --border2:#253349;
  --text:#E8EDF7;
  --text2:#9BA8BF;
  --text3:#5C6B85;
  --blue:#3B82F6;
  --blue-lt:#60A5FA;
  --blue-dk:#1D4ED8;
  --blue-glow:rgba(59,130,246,0.18);
  --green:#10B981;
  --green-lt:#34D399;
  --green-dk:#059669;
  --green-glow:rgba(16,185,129,0.18);
  --amber:#F59E0B;
  --amber-lt:#FCD34D;
  --amber-glow:rgba(245,158,11,0.18);
  --red:#EF4444;
  --red-lt:#F87171;
  --red-glow:rgba(239,68,68,0.18);
  --violet:#8B5CF6;
  --violet-lt:#A78BFA;
  --violet-glow:rgba(139,92,246,0.18);
  --rw-color:#3B82F6;
  --math-color:#10B981;
  --ff-head:'Sora',-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;
  --ff-body:'Lora',Georgia,serif;
  --ff-mono:'JetBrains Mono','Consolas','Courier New',monospace;
  --r:12px;
  --r2:8px;
  --ease:cubic-bezier(0.4,0,0.2,1);
}

html{scroll-behavior:smooth}
body{font-family:var(--ff-head);background:var(--bg);color:var(--text);min-height:100vh;overflow-x:hidden}

/* ── NOISE OVERLAY ───────────────────────────────── */
body::after{
  content:'';position:fixed;inset:0;pointer-events:none;z-index:9999;
  opacity:0.025;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ── SCREENS ─────────────────────────────────────── */
.screen{display:none;min-height:100vh;animation:fadeIn 0.35s var(--ease)}
.screen.active{display:flex;flex-direction:column}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* ══════════════════════════════════════════════════
   HOME SCREEN
══════════════════════════════════════════════════ */
#home{
  background:
    radial-gradient(ellipse 70% 60% at 80% 10%, rgba(59,130,246,0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 10% 80%, rgba(16,185,129,0.08) 0%, transparent 55%),
    var(--bg);
  align-items:stretch;
}
.home-nav{
  display:flex;align-items:center;
  padding:1.75rem 2.5rem;border-bottom:1px solid var(--border);
}
.home-logo-img{display:block;height:96px;width:auto}
.logo{display:flex;align-items:center;gap:0.6rem}
.logo-icon{
  width:36px;height:36px;border-radius:8px;
  background:linear-gradient(135deg,var(--blue),var(--violet));
  display:flex;align-items:center;justify-content:center;
  font-size:1.1rem;font-weight:800;color:#fff;font-family:var(--ff-head);
  box-shadow:0 0 18px var(--blue-glow);
}
.logo-text{font-size:1.15rem;font-weight:700;letter-spacing:-0.02em}
.logo-text span{color:var(--blue-lt)}
.nav-pill{
  background:var(--panel);border:1px solid var(--border2);
  padding:0.4rem 1rem;border-radius:999px;
  font-size:0.75rem;font-weight:600;color:var(--text2);
  letter-spacing:0.06em;text-transform:uppercase;
}

.home-hero{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:3rem 2rem 2rem;text-align:center;gap:2rem;
}
.hero-badge{
  display:inline-flex;align-items:center;gap:0.45rem;
  background:rgba(59,130,246,0.1);border:1px solid rgba(59,130,246,0.3);
  border-radius:999px;padding:0.3rem 0.85rem;
  font-size:0.7rem;font-weight:600;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--blue-lt);
}
.hero-badge::before{content:'●';font-size:0.55rem;color:var(--green-lt);animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.3}}

.hero-title{
  font-size:clamp(2.4rem,5.5vw,4rem);font-weight:800;
  letter-spacing:-0.035em;line-height:1.1;
  background:linear-gradient(135deg,var(--text) 0%,var(--blue-lt) 60%,var(--violet-lt) 100%);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  max-width:700px;
}
.hero-sub{
  font-family:var(--ff-body);font-size:1.05rem;color:var(--text2);
  max-width:520px;line-height:1.7;font-style:italic;
}

.mode-grid{
  display:grid;grid-template-columns:1fr 1fr;gap:1.25rem;
  max-width:780px;width:100%;margin-top:0.5rem;
}
.mode-card{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--r);
  padding:1.8rem;text-align:left;cursor:pointer;
  transition:all 0.25s var(--ease);position:relative;overflow:hidden;
}
.mode-card::before{
  content:'';position:absolute;inset:0;opacity:0;transition:opacity 0.3s var(--ease);
  background:linear-gradient(135deg,var(--glow-a,rgba(59,130,246,0.08)),var(--glow-b,rgba(139,92,246,0.04)));
}
.mode-card:hover{border-color:var(--border2);transform:translateY(-3px);box-shadow:0 12px 40px rgba(0,0,0,0.4)}
.mode-card:hover::before{opacity:1}
.mode-card.drill{--glow-a:rgba(59,130,246,0.1);--glow-b:rgba(59,130,246,0.04)}
.mode-card.test{--glow-a:rgba(16,185,129,0.1);--glow-b:rgba(16,185,129,0.04)}


.mode-icon{
  width:44px;height:44px;border-radius:10px;margin-bottom:1rem;
  display:flex;align-items:center;justify-content:center;font-size:1.3rem;
}
.drill .mode-icon{background:rgba(59,130,246,0.15);border:1px solid rgba(59,130,246,0.25)}
.test .mode-icon{background:rgba(16,185,129,0.15);border:1px solid rgba(16,185,129,0.25)}

.mode-label{font-size:0.65rem;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;margin-bottom:0.4rem;color:var(--text3)}
.drill .mode-label{color:var(--blue-lt)}
.test .mode-label{color:var(--green-lt)}
.mode-title{font-size:1.15rem;font-weight:700;margin-bottom:0.5rem;letter-spacing:-0.02em}
.mode-desc{font-family:var(--ff-body);font-size:0.875rem;color:var(--text2);line-height:1.6}
.mode-arrow{
  position:absolute;bottom:1.4rem;right:1.4rem;
  width:32px;height:32px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--panel2);border:1px solid var(--border2);
  font-size:0.8rem;color:var(--text3);transition:all 0.2s;
}
.mode-card:hover .mode-arrow{background:var(--blue);border-color:var(--blue);color:#fff;transform:translate(2px,-2px)}
.test:hover .mode-arrow{background:var(--green);border-color:var(--green)}

.stats-strip{
  display:flex;align-items:center;justify-content:center;gap:2.5rem;
  padding:1.25rem;border-top:1px solid var(--border);
  font-size:0.75rem;color:var(--text3);
}
.stat-item{display:flex;align-items:center;gap:0.4rem}
.stat-dot{width:6px;height:6px;border-radius:50%}

/* ══════════════════════════════════════════════════
   DRILL SCREEN
══════════════════════════════════════════════════ */
#drill{background:var(--bg);flex-direction:column}
.drill-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:1rem 2rem;border-bottom:1px solid var(--border);
  background:var(--bg2);position:sticky;top:0;z-index:50;
}
.back-btn{
  display:flex;align-items:center;gap:0.5rem;
  background:var(--panel);border:1px solid var(--border2);
  padding:0.45rem 0.9rem;border-radius:var(--r2);
  font-size:0.8rem;font-weight:600;color:var(--text2);cursor:pointer;
  transition:all 0.2s;
}
.back-btn:hover{color:var(--text);border-color:var(--border2)}
.drill-title-bar{font-size:0.85rem;font-weight:600;color:var(--text2)}
.drill-title-bar span{color:var(--text)}

.drill-layout{display:flex;flex:1;min-height:0}
.drill-sidebar{
  width:260px;flex-shrink:0;border-right:1px solid var(--border);
  background:var(--bg2);padding:1.25rem;overflow-y:auto;
}
.sidebar-section{margin-bottom:1.5rem}
.sidebar-section-label{
  font-size:0.6rem;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;
  color:var(--text3);margin-bottom:0.7rem;padding-bottom:0.4rem;
  border-bottom:1px solid var(--border);
}
.topic-btn{
  width:100%;text-align:left;padding:0.6rem 0.75rem;border-radius:var(--r2);
  border:1px solid transparent;background:transparent;color:var(--text2);
  font-family:var(--ff-head);font-size:0.8rem;cursor:pointer;
  transition:all 0.18s;margin-bottom:0.25rem;display:flex;align-items:center;gap:0.5rem;
}
.topic-btn:hover{background:var(--panel);color:var(--text);border-color:var(--border)}
.topic-btn.active{background:rgba(59,130,246,0.1);border-color:rgba(59,130,246,0.35);color:var(--blue-lt)}
.topic-btn.math-active{background:rgba(16,185,129,0.1);border-color:rgba(16,185,129,0.35);color:var(--green-lt)}
.topic-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0}
.rw-dot{background:var(--blue)}
.math-dot{background:var(--green)}

.drill-main{flex:1;overflow-y:auto;padding:2rem;display:flex;flex-direction:column;align-items:center}
.drill-question-box{
  max-width:720px;width:100%;
  background:var(--panel);border:1px solid var(--border);border-radius:var(--r);
  padding:2rem;margin-bottom:1.25rem;
}
.q-meta{display:flex;align-items:center;gap:0.75rem;margin-bottom:1.25rem}
.q-badge{
  padding:0.25rem 0.6rem;border-radius:5px;font-size:0.65rem;font-weight:700;
  letter-spacing:0.08em;text-transform:uppercase;
}
.q-badge.rw{background:rgba(59,130,246,0.15);color:var(--blue-lt);border:1px solid rgba(59,130,246,0.25)}
.q-badge.math{background:rgba(16,185,129,0.15);color:var(--green-lt);border:1px solid rgba(16,185,129,0.25)}
.q-num{font-size:0.75rem;color:var(--text3);font-weight:600}
.q-difficulty{
  margin-left:auto;padding:0.2rem 0.55rem;border-radius:5px;
  font-size:0.65rem;font-weight:700;letter-spacing:0.06em;text-transform:uppercase;
}
.diff-easy{background:rgba(16,185,129,0.12);color:var(--green-lt)}
.diff-med{background:rgba(245,158,11,0.12);color:var(--amber-lt)}
.diff-hard{background:rgba(239,68,68,0.12);color:var(--red-lt)}

.passage-box{
  background:var(--bg3);border:1px solid var(--border);border-radius:var(--r2);
  padding:1.25rem;margin-bottom:1.25rem;
  font-family:var(--ff-body);font-size:0.92rem;line-height:1.75;color:var(--text2);
  border-left:3px solid var(--blue);
}
.passage-box.math-passage{border-left-color:var(--green)}
.chart-box{
  background:var(--bg3);border:1px solid var(--border);border-radius:var(--r2);
  padding:1rem;margin-bottom:1.25rem;overflow-x:auto;
}
.chart-box table{width:100%;border-collapse:collapse;font-size:0.82rem;font-family:var(--ff-mono)}
.chart-box th{background:rgba(59,130,246,0.12);color:var(--blue-lt);padding:0.4rem 0.75rem;text-align:left;border:1px solid var(--border2);font-weight:600;font-size:0.75rem;letter-spacing:0.04em}
.chart-box td{padding:0.35rem 0.75rem;border:1px solid var(--border);color:var(--text2)}
.chart-box tr:nth-child(even) td{background:rgba(255,255,255,0.02)}
.chart-box .chart-title{font-size:0.72rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--text3);margin-bottom:0.65rem}
.chart-box svg{display:block;max-width:100%;height:auto}
.q-stem{
  font-family:var(--ff-body);font-size:1rem;line-height:1.7;color:var(--text);
  margin-bottom:1.5rem;
}
.choices{display:flex;flex-direction:column;gap:0.6rem}
.choice{
  display:flex;align-items:flex-start;gap:0.8rem;
  padding:0.85rem 1rem;border-radius:var(--r2);
  border:1px solid var(--border);background:var(--bg3);
  cursor:pointer;transition:all 0.18s var(--ease);
  font-family:var(--ff-body);font-size:0.92rem;color:var(--text2);
  text-align:left;width:100%;
}
.choice:hover:not(.locked){border-color:var(--border2);background:var(--panel2);color:var(--text)}
.choice.selected{border-color:var(--blue);background:rgba(59,130,246,0.08);color:var(--text)}
.choice.correct{border-color:var(--green);background:rgba(16,185,129,0.1);color:var(--green-lt)}
.choice.wrong{border-color:var(--red);background:rgba(239,68,68,0.08);color:var(--red-lt)}
.choice.locked{cursor:default}
.choice-letter{
  width:26px;height:26px;border-radius:6px;border:1.5px solid var(--border2);
  display:flex;align-items:center;justify-content:center;
  font-size:0.75rem;font-weight:700;flex-shrink:0;font-family:var(--ff-head);
  transition:all 0.18s;
}
.choice:hover:not(.locked) .choice-letter{border-color:var(--blue);color:var(--blue-lt)}
.choice.selected .choice-letter{background:var(--blue);border-color:var(--blue);color:#fff}
.choice.correct .choice-letter{background:var(--green);border-color:var(--green);color:#fff}
.choice.wrong .choice-letter{background:var(--red);border-color:var(--red);color:#fff}

.explain-box{
  background:var(--bg3);border:1px solid var(--border);border-radius:var(--r2);
  padding:1.25rem;margin-top:1rem;animation:fadeIn 0.3s var(--ease);
  border-left:3px solid var(--green);
}
.explain-box.wrong-explain{border-left-color:var(--red)}
.explain-header{display:flex;align-items:center;gap:0.5rem;margin-bottom:0.6rem}
.explain-icon{font-size:1rem}
.explain-title{font-size:0.75rem;font-weight:700;letter-spacing:0.06em;text-transform:uppercase}
.explain-text{font-family:var(--ff-body);font-size:0.88rem;color:var(--text2);line-height:1.65}
.explain-skill{
  display:inline-flex;align-items:center;gap:0.35rem;margin-top:0.6rem;
  font-size:0.7rem;font-weight:600;color:var(--text3);
  background:var(--panel);border:1px solid var(--border);
  padding:0.2rem 0.55rem;border-radius:4px;
}

.drill-nav-btns{display:flex;gap:0.75rem;max-width:720px;width:100%;padding-bottom:2rem}
.nav-btn{
  flex:1;padding:0.8rem;border-radius:var(--r2);font-family:var(--ff-head);
  font-size:0.85rem;font-weight:600;cursor:pointer;transition:all 0.2s;border:1px solid var(--border);
  background:var(--panel);color:var(--text2);
}
.nav-btn:hover{background:var(--panel2);color:var(--text);border-color:var(--border2)}
.nav-btn.primary{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(59,130,246,0.3)}
.nav-btn.primary:hover{background:var(--blue-dk);box-shadow:0 6px 18px rgba(59,130,246,0.4)}

/* ══════════════════════════════════════════════════
   TEST SCREEN
══════════════════════════════════════════════════ */
#test-setup{
  background:
    radial-gradient(ellipse 60% 50% at 50% 20%, rgba(16,185,129,0.08) 0%, transparent 55%),
    var(--bg);
  align-items:center;justify-content:center;padding:2rem;
}
.setup-card{
  max-width:540px;width:100%;
  background:var(--panel);border:1px solid var(--border);border-radius:var(--r);
  padding:2.5rem;
}
.setup-icon{font-size:2.5rem;margin-bottom:1rem}
.setup-title{font-size:1.5rem;font-weight:800;letter-spacing:-0.03em;margin-bottom:0.5rem}
.setup-desc{font-family:var(--ff-body);font-size:0.92rem;color:var(--text2);line-height:1.65;margin-bottom:1.75rem}
.setup-info{
  display:grid;grid-template-columns:1fr 1fr;gap:0.75rem;margin-bottom:1.75rem;
}
.info-item{
  background:var(--bg3);border:1px solid var(--border);border-radius:var(--r2);
  padding:0.85rem;
}
.info-label{font-size:0.65rem;font-weight:700;color:var(--text3);letter-spacing:0.1em;text-transform:uppercase;margin-bottom:0.3rem}
.info-value{font-size:0.95rem;font-weight:700}
.setup-btn{
  width:100%;padding:0.9rem;border-radius:var(--r2);
  background:linear-gradient(135deg,var(--green),var(--green-dk));
  border:none;color:#fff;font-family:var(--ff-head);font-size:1rem;font-weight:700;
  cursor:pointer;transition:all 0.22s;box-shadow:0 4px 18px rgba(16,185,129,0.3);
  letter-spacing:-0.01em;
}
.setup-btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(16,185,129,0.4)}
.setup-back{
  width:100%;padding:0.65rem;border-radius:var(--r2);background:transparent;
  border:1px solid var(--border);color:var(--text3);font-family:var(--ff-head);
  font-size:0.85rem;font-weight:600;cursor:pointer;margin-top:0.6rem;transition:all 0.2s;
}
.setup-back:hover{color:var(--text2);border-color:var(--border2)}

#test{background:var(--bg);flex-direction:column}
.test-topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:0.75rem 2rem;border-bottom:1px solid var(--border);
  background:var(--bg2);position:sticky;top:0;z-index:50;
}
.test-logo{font-size:0.85rem;font-weight:700;color:var(--text2)}
.test-logo span{color:var(--text)}
.section-info{
  display:flex;align-items:center;gap:0.75rem;
  font-size:0.8rem;font-weight:600;
}
.section-tag{
  padding:0.25rem 0.7rem;border-radius:5px;font-size:0.7rem;
  font-weight:700;letter-spacing:0.06em;text-transform:uppercase;
}
.section-tag.rw{background:rgba(59,130,246,0.15);color:var(--blue-lt);border:1px solid rgba(59,130,246,0.25)}
.section-tag.math{background:rgba(16,185,129,0.15);color:var(--green-lt);border:1px solid rgba(16,185,129,0.25)}
.timer{
  font-family:var(--ff-mono);font-size:1.05rem;font-weight:600;
  background:var(--panel);border:1px solid var(--border2);
  padding:0.35rem 0.85rem;border-radius:var(--r2);color:var(--text);
  transition:all 0.3s;
}
.timer.warn{color:var(--amber-lt);border-color:rgba(245,158,11,0.4);background:rgba(245,158,11,0.08)}
.timer.danger{color:var(--red-lt);border-color:rgba(239,68,68,0.5);background:rgba(239,68,68,0.1);animation:timerPulse 1s infinite}
@keyframes timerPulse{0%,100%{opacity:1}50%{opacity:0.6}}

.test-progress{
  display:flex;align-items:center;gap:1rem;padding:0.6rem 2rem;
  background:var(--bg2);border-bottom:1px solid var(--border);
}
.progress-label{font-size:0.7rem;color:var(--text3);font-weight:600;white-space:nowrap}
.progress-bar{flex:1;height:4px;background:var(--border);border-radius:99px;overflow:hidden}
.progress-fill{height:100%;border-radius:99px;background:linear-gradient(90deg,var(--blue),var(--violet));transition:width 0.4s var(--ease)}
.progress-fill.math-fill{background:linear-gradient(90deg,var(--green),var(--blue))}
.q-counter{font-size:0.7rem;color:var(--text3);font-weight:600;font-family:var(--ff-mono)}
.module-badge{
  font-size:0.65rem;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;
  padding:0.2rem 0.55rem;border-radius:4px;
}
.mod1{background:rgba(139,92,246,0.12);color:var(--violet-lt);border:1px solid rgba(139,92,246,0.25)}
.mod2-easier{background:rgba(16,185,129,0.12);color:var(--green-lt);border:1px solid rgba(16,185,129,0.25)}
.mod2-harder{background:rgba(239,68,68,0.12);color:var(--red-lt);border:1px solid rgba(239,68,68,0.25)}

.test-body{flex:1;display:flex;justify-content:center;align-items:flex-start;padding:2rem;overflow-y:auto}
.test-q-wrap{max-width:760px;width:100%}
.test-q-layout{display:grid;grid-template-columns:1fr 1fr;gap:2rem}
.test-q-layout.no-passage{grid-template-columns:1fr;max-width:600px;margin:0 auto}

.passage-panel{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--r);
  padding:1.5rem;overflow-y:auto;max-height:calc(100vh - 200px);
  font-family:var(--ff-body);font-size:0.9rem;line-height:1.8;color:var(--text2);
  position:sticky;top:0;
}
.passage-panel p{margin-bottom:0.75rem}
.passage-label{
  font-size:0.6rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;
  color:var(--text3);margin-bottom:0.85rem;padding-bottom:0.5rem;border-bottom:1px solid var(--border);
}
.question-panel{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--r);padding:1.75rem;
}
.test-q-stem{
  font-family:var(--ff-body);font-size:1rem;line-height:1.7;color:var(--text);margin-bottom:1.5rem;
}
.test-choices{display:flex;flex-direction:column;gap:0.6rem}
.test-choice{
  display:flex;align-items:flex-start;gap:0.75rem;
  padding:0.85rem 1rem;border-radius:var(--r2);
  border:1.5px solid var(--border);background:var(--bg3);
  cursor:pointer;transition:all 0.18s var(--ease);
  font-family:var(--ff-body);font-size:0.9rem;color:var(--text2);text-align:left;width:100%;
}
.test-choice:hover:not(.test-locked){border-color:var(--blue);background:rgba(59,130,246,0.05);color:var(--text)}
.test-choice.test-selected{border-color:var(--blue);background:rgba(59,130,246,0.1);color:var(--text)}
.test-choice.test-correct{border-color:var(--green);background:rgba(16,185,129,0.1);color:var(--green-lt)}
.test-choice.test-wrong{border-color:var(--red);background:rgba(239,68,68,0.08);color:var(--red-lt)}
.test-choice.test-locked{cursor:default}
.tc-letter{
  width:28px;height:28px;border-radius:7px;border:1.5px solid var(--border2);
  display:flex;align-items:center;justify-content:center;
  font-size:0.75rem;font-weight:700;flex-shrink:0;font-family:var(--ff-head);transition:all 0.18s;
}
.test-choice:hover:not(.test-locked) .tc-letter{border-color:var(--blue);color:var(--blue-lt)}
.test-choice.test-selected .tc-letter{background:var(--blue);border-color:var(--blue);color:#fff}
.test-choice.test-correct .tc-letter{background:var(--green);border-color:var(--green);color:#fff}
.test-choice.test-wrong .tc-letter{background:var(--red);border-color:var(--red);color:#fff}

.test-bottom{
  border-top:1px solid var(--border);padding:1rem 2rem;
  background:var(--bg2);display:flex;align-items:center;justify-content:space-between;
}
.q-dots{display:flex;flex-wrap:wrap;gap:4px;max-width:600px}
.q-dot{
  width:20px;height:20px;border-radius:5px;border:1px solid var(--border2);
  background:var(--panel);cursor:pointer;transition:all 0.18s;
  font-size:0.6rem;font-family:var(--ff-mono);font-weight:600;color:var(--text3);
  display:flex;align-items:center;justify-content:center;
}
.q-dot:hover{border-color:var(--blue);color:var(--blue-lt)}
.q-dot.answered{background:rgba(59,130,246,0.2);border-color:rgba(59,130,246,0.4);color:var(--blue-lt)}
.q-dot.current{background:var(--blue);border-color:var(--blue);color:#fff}
.q-dot.flagged{background:rgba(245,158,11,0.2);border-color:rgba(245,158,11,0.5);color:var(--amber-lt)}
.test-next-btn{
  padding:0.7rem 1.6rem;border-radius:var(--r2);
  background:var(--blue);border:none;color:#fff;
  font-family:var(--ff-head);font-size:0.85rem;font-weight:700;cursor:pointer;
  transition:all 0.2s;white-space:nowrap;
}
.test-next-btn:hover{background:var(--blue-dk);transform:translateY(-1px)}
.test-next-btn.submit{background:var(--green);box-shadow:0 4px 14px rgba(16,185,129,0.3)}
.test-next-btn.submit:hover{background:var(--green-dk)}

/* Break screen */
#test-break{
  background:var(--bg);align-items:center;justify-content:center;padding:2rem;
}
.break-card{
  max-width:480px;width:100%;text-align:center;
  background:var(--panel);border:1px solid var(--border);border-radius:var(--r);padding:2.5rem;
}
.break-icon{font-size:3rem;margin-bottom:1rem}
.break-title{font-size:1.4rem;font-weight:800;margin-bottom:0.5rem}
.break-desc{font-family:var(--ff-body);font-size:0.92rem;color:var(--text2);line-height:1.65;margin-bottom:1.5rem}
.break-timer-big{
  font-family:var(--ff-mono);font-size:3rem;font-weight:700;color:var(--green-lt);
  margin:1rem 0;letter-spacing:0.05em;
}
.break-continue-btn{
  width:100%;padding:0.9rem;border-radius:var(--r2);
  background:linear-gradient(135deg,var(--green),var(--green-dk));
  border:none;color:#fff;font-family:var(--ff-head);font-size:1rem;font-weight:700;
  cursor:pointer;transition:all 0.22s;
}
.break-continue-btn:hover{transform:translateY(-2px)}

/* Results */
#results{
  background:
    radial-gradient(ellipse 70% 50% at 50% 0%, rgba(59,130,246,0.1) 0%, transparent 55%),
    var(--bg);
  align-items:center;justify-content:flex-start;overflow-y:auto;padding:2rem;
}
.results-wrap{max-width:800px;width:100%;margin:0 auto}
.results-header{text-align:center;margin-bottom:2.5rem}
.results-score-ring{
  width:140px;height:140px;border-radius:50%;margin:0 auto 1.25rem;
  background:conic-gradient(var(--blue) var(--pct,0%), var(--border) var(--pct,0%));
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 0 40px var(--blue-glow);
  position:relative;
}
.results-score-ring::before{
  content:'';position:absolute;width:110px;height:110px;border-radius:50%;background:var(--bg);
}
.ring-score{position:relative;z-index:1;text-align:center}
.ring-number{font-size:1.9rem;font-weight:800;line-height:1;display:block}
.ring-label{font-size:0.65rem;color:var(--text3);font-weight:600;letter-spacing:0.08em;text-transform:uppercase}
.results-title{font-size:1.6rem;font-weight:800;letter-spacing:-0.03em;margin-bottom:0.4rem}
.results-sub{font-family:var(--ff-body);font-size:0.95rem;color:var(--text2);font-style:italic}

.score-breakdown{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:2rem}
.score-section{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--r);padding:1.5rem;
}
.ss-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem}
.ss-title{font-size:0.85rem;font-weight:700}
.ss-score{font-size:1.4rem;font-weight:800}
.ss-score.rw-score{color:var(--blue-lt)}
.ss-score.math-score{color:var(--green-lt)}
.topic-bars{display:flex;flex-direction:column;gap:0.6rem}
.topic-bar-item{font-size:0.78rem}
.tb-label{display:flex;justify-content:space-between;color:var(--text2);margin-bottom:0.25rem}
.tb-track{height:5px;background:var(--border);border-radius:99px;overflow:hidden}
.tb-fill{height:100%;border-radius:99px;transition:width 1.2s var(--ease);width:0}
.tb-fill.rw-fill{background:linear-gradient(90deg,var(--blue),var(--violet))}
.tb-fill.math-fill{background:linear-gradient(90deg,var(--green),var(--blue))}

.adaptive-note{
  background:rgba(139,92,246,0.08);border:1px solid rgba(139,92,246,0.25);
  border-radius:var(--r);padding:1.25rem;margin-bottom:2rem;
  display:flex;align-items:flex-start;gap:0.85rem;
}
.adaptive-note-icon{font-size:1.3rem;flex-shrink:0}
.adaptive-note-text{font-family:var(--ff-body);font-size:0.88rem;color:var(--text2);line-height:1.65}
.adaptive-note-text strong{color:var(--violet-lt);font-style:normal}

.results-actions{display:grid;grid-template-columns:1fr 1fr;gap:0.75rem;margin-bottom:2rem}
.action-btn{
  padding:0.85rem;border-radius:var(--r2);font-family:var(--ff-head);
  font-size:0.875rem;font-weight:700;cursor:pointer;transition:all 0.2s;
  border:1px solid var(--border);
}
.action-btn.primary{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(59,130,246,0.3)}
.action-btn.secondary{background:var(--panel);color:var(--text2)}
.action-btn:hover{transform:translateY(-2px);opacity:0.9}

.missed-section{background:var(--panel);border:1px solid var(--border);border-radius:var(--r);padding:1.5rem;margin-bottom:2rem}
.missed-title{font-size:0.85rem;font-weight:700;margin-bottom:1rem;color:var(--text)}
.missed-item{
  border-bottom:1px solid var(--border);padding:1rem 0;
}
.missed-item:last-child{border-bottom:none;padding-bottom:0}
.missed-q-text{font-family:var(--ff-body);font-size:0.88rem;color:var(--text2);margin-bottom:0.5rem;line-height:1.6}
.missed-answers{display:flex;gap:0.75rem;flex-wrap:wrap}
.your-ans{font-size:0.75rem;padding:0.2rem 0.55rem;border-radius:4px;background:rgba(239,68,68,0.1);border:1px solid rgba(239,68,68,0.3);color:var(--red-lt)}
.correct-ans{font-size:0.75rem;padding:0.2rem 0.55rem;border-radius:4px;background:rgba(16,185,129,0.1);border:1px solid rgba(16,185,129,0.3);color:var(--green-lt)}
.missed-exp{font-family:var(--ff-body);font-size:0.8rem;color:var(--text3);margin-top:0.5rem;line-height:1.6}

/* ── UTILITY ──────────────────────────────────────────── */
.hidden{display:none!important}


/* ── LOADING SCREEN ─────────────────────────────────── */
#loading {
  position: fixed; inset: 0;
  background: var(--bg1);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  z-index: 9999; gap: 1.5rem;
}
.loading-spinner {
  width: 48px; height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--teal);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
#loading-msg { color: var(--text2); font-size: 1rem; }
.loading-logo { font-size: 2rem; font-weight: 800; color: var(--teal); letter-spacing: -1px; }

/* ── Test selector buttons ─────────────────────────── */
.test-select-btn {
  display:flex; flex-direction:column; align-items:center; gap:0.3rem;
  padding:0.7rem 1.2rem; border-radius:10px; cursor:pointer;
  background:var(--card); border:2px solid var(--border);
  color:var(--text-muted); font-size:0.85rem; font-weight:600;
  transition:all 0.2s; min-width:130px;
}
.test-select-btn:hover {
  border-color:var(--blue-lt); color:var(--blue-lt);
  background:rgba(74,158,255,0.08);
}
.test-select-btn.active {
  border-color:var(--green-lt); color:var(--green-lt);
  background:rgba(52,211,153,0.1);
}

/* ══ DRILL MODE STYLES ══════════════════════════════════════════════ */
.drill-q-wrap{display:flex;flex-direction:column;gap:1.2rem;padding:1.5rem;max-width:900px;margin:0 auto;width:100%}
.drill-passage{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:1.2rem 1.4rem}
.drill-passage-text{font-size:0.92rem;line-height:1.75;color:var(--text);margin-top:0.5rem}
.drill-question-area{display:flex;flex-direction:column;gap:1rem}
.drill-meta{display:flex;align-items:center;gap:0.6rem;flex-wrap:wrap}
.drill-q-stem{font-size:1rem;font-weight:600;line-height:1.6;color:var(--text)}
.drill-choices{display:flex;flex-direction:column;gap:0.6rem}
.drill-choice{display:flex;align-items:flex-start;gap:0.75rem;padding:0.75rem 1rem;background:var(--card);border:2px solid var(--border);border-radius:10px;cursor:pointer;text-align:left;transition:all 0.15s;width:100%}
.drill-choice:hover:not(:disabled){border-color:var(--blue-lt);background:rgba(74,158,255,0.06)}
.drill-choice.correct{border-color:var(--green-lt)!important;background:rgba(52,211,153,0.1)!important}
.drill-choice.wrong{border-color:var(--red)!important;background:rgba(248,113,113,0.1)!important}
.drill-choice.dimmed{opacity:0.45}
.drill-choice:disabled{cursor:default}
.choice-letter{display:flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;background:var(--bg2);font-weight:700;font-size:0.82rem;color:var(--text-muted);flex-shrink:0;margin-top:2px}
.drill-choice.correct .choice-letter{background:var(--green-lt);color:#fff}
.drill-choice.wrong .choice-letter{background:var(--red);color:#fff}
.choice-text{font-size:0.9rem;line-height:1.55;color:var(--text)}
.drill-explain{border-radius:10px;padding:1rem 1.2rem;margin-top:0.25rem}
.correct-explain{background:rgba(52,211,153,0.08);border:1px solid rgba(52,211,153,0.3)}
.wrong-explain{background:rgba(248,113,113,0.08);border:1px solid rgba(248,113,113,0.3)}
.explain-verdict{font-weight:700;font-size:0.95rem;margin-bottom:0.6rem;color:var(--text)}
.explain-body{font-size:0.875rem;line-height:1.7;color:var(--text2)}
.drill-nav{display:flex;align-items:center;justify-content:space-between;padding:0.5rem 0;margin-top:0.25rem}
.drill-nav-btn{padding:0.5rem 1.2rem;border-radius:8px;border:1.5px solid var(--border);background:var(--card);color:var(--text2);font-size:0.875rem;font-weight:600;cursor:pointer;transition:all 0.15s}
.drill-nav-btn:hover:not(:disabled){border-color:var(--blue-lt);color:var(--blue-lt)}
.drill-nav-btn.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.drill-nav-btn.primary:hover:not(:disabled){background:var(--blue-lt)}
.drill-nav-btn:disabled{opacity:0.35;cursor:default}
.drill-counter{font-size:0.85rem;font-weight:600;color:var(--text-muted)}


/* ══ FLASHCARD SCREEN ═══════════════════════════════════════════════ */
#flashcards { background:var(--bg); }
.fc-header {
  display:flex; align-items:center; justify-content:space-between;
  padding:1rem 1.5rem; border-bottom:1px solid var(--border);
  background:var(--bg2); flex-shrink:0;
}
.fc-title { font-weight:700; font-size:1rem; color:var(--text); }
.fc-layout {
  display:flex; flex:1; overflow:hidden; min-height:0;
}
.fc-sidebar {
  width:240px; flex-shrink:0; background:var(--bg2);
  border-right:1px solid var(--border);
  overflow-y:auto; padding:0.75rem 0;
}
.fc-sidebar-group { margin-bottom:1rem; }
.fc-sidebar-label {
  font-size:0.65rem; font-weight:700; letter-spacing:0.1em;
  text-transform:uppercase; color:var(--text3);
  padding:0 1rem 0.35rem;
}
.fc-deck-btn {
  display:flex; align-items:center; gap:0.5rem;
  width:100%; padding:0.5rem 1rem;
  background:none; border:none; border-left:3px solid transparent;
  color:var(--text2); font-size:0.82rem; cursor:pointer;
  text-align:left; transition:background 0.15s, border-color 0.15s;
  font-family:var(--ff-head);
}
.fc-deck-btn:hover { background:var(--bg3); color:var(--text); border-left-color:var(--border2); }
.fc-deck-btn.active { background:rgba(139,92,246,0.08); color:var(--violet-lt); border-left-color:var(--violet); font-weight:600; }
.fc-deck-dot { width:6px; height:6px; border-radius:50%; flex-shrink:0; }
.fc-dot-rw   { background:var(--rw-color); }
.fc-dot-math { background:var(--math-color); }
.fc-dot-all  { background:var(--violet); }
.fc-deck-count {
  margin-left:auto; font-size:0.7rem; color:var(--text3);
  background:var(--bg3); padding:1px 6px; border-radius:10px;
}
.fc-stats-box {
  margin:0.75rem; padding:0.75rem;
  background:var(--bg3); border:1px solid var(--border); border-radius:var(--r2);
}
.fc-stat-row {
  display:flex; justify-content:space-between;
  font-size:0.78rem; color:var(--text2); padding:0.18rem 0;
}
.fc-restart {
  width:100%; margin-top:0.5rem; padding:0.4rem;
  background:var(--bg2); border:1px solid var(--border);
  border-radius:var(--r2); color:var(--text2);
  font-size:0.78rem; cursor:pointer; font-family:var(--ff-head);
}
.fc-restart:hover { background:var(--bg); color:var(--text); }
.fc-main {
  flex:1; display:flex; flex-direction:column;
  align-items:center; padding:1.5rem; overflow-y:auto;
}
.fc-placeholder {
  display:flex; flex-direction:column; align-items:center;
  justify-content:center; text-align:center; flex:1;
  color:var(--text3); padding:3rem 2rem;
}
.fc-progress-wrap { width:100%; max-width:700px; margin-bottom:1rem; }
.fc-prog-bar { height:4px; background:var(--border); border-radius:2px; overflow:hidden; }
.fc-prog-fill {
  height:100%; border-radius:2px;
  background:linear-gradient(90deg,var(--violet),var(--blue));
  transition:width 0.4s var(--ease);
}
.fc-prog-label {
  display:flex; justify-content:space-between;
  font-size:0.72rem; color:var(--text3); margin-top:0.3rem;
}
.fc-scene { width:100%; max-width:700px; perspective:1400px; cursor:pointer; margin-bottom:1rem; }
.fc-inner {
  position:relative; width:100%;
  transform-style:preserve-3d;
  transition:transform 0.55s cubic-bezier(0.4,0,0.2,1);
  min-height:260px;
}
.fc-inner.flipped { transform:rotateY(180deg); }
.fc-face {
  position:absolute; top:0; left:0; width:100%;
  background:var(--panel); border:1px solid var(--border);
  border-radius:var(--r); padding:1.5rem 1.75rem;
  backface-visibility:hidden; -webkit-backface-visibility:hidden;
}
.fc-front { position:relative; }
.fc-back  { transform:rotateY(180deg); min-height:260px; position:absolute; }
.fc-face-label {
  display:flex; align-items:center; gap:0.5rem;
  font-size:0.68rem; font-weight:700; letter-spacing:0.1em;
  text-transform:uppercase; color:var(--text3); margin-bottom:0.85rem;
}
.fc-skill-badge {
  padding:2px 7px; border-radius:6px;
  background:var(--bg3); color:var(--text2); font-size:0.72rem; font-weight:600;
}
.fc-diff-badge { padding:2px 7px; border-radius:6px; font-size:0.72rem; font-weight:700; }
.fc-easy  { background:rgba(16,185,129,0.12); color:var(--green); }
.fc-med   { background:rgba(245,158,11,0.12);  color:var(--amber); }
.fc-hard  { background:rgba(239,68,68,0.12);   color:var(--red-lt); }
.fc-passage {
  font-family:var(--ff-body); font-size:0.875rem; line-height:1.75;
  color:var(--text2); border-left:3px solid var(--border2);
  padding-left:0.8rem; margin-bottom:0.85rem;
}
.fc-question { font-size:1rem; font-weight:600; line-height:1.6; color:var(--text); margin-bottom:0.75rem; }
.fc-tap-hint { font-size:0.72rem; color:var(--text3); text-align:center; padding-top:0.75rem; border-top:1px solid var(--border); }
.fc-answer-label { font-size:0.7rem; font-weight:700; text-transform:uppercase; letter-spacing:0.08em; color:var(--green); margin-bottom:0.35rem; }
.fc-answer-text  { font-size:1.05rem; font-weight:700; color:var(--green-lt); margin-bottom:0.85rem; }
.fc-choices {
  display:grid; grid-template-columns:1fr 1fr;
  gap:0.35rem; margin-bottom:0.85rem;
}
.fc-choice {
  display:flex; align-items:flex-start; gap:0.45rem;
  padding:0.45rem 0.6rem; border-radius:var(--r2);
  background:var(--bg3); color:var(--text2); font-size:0.8rem;
}
.fc-choice.correct { background:rgba(16,185,129,0.12); border:1.5px solid var(--green); color:var(--green-lt); font-weight:600; }
.fc-choice .ltr { font-weight:700; font-size:0.72rem; color:var(--text3); flex-shrink:0; }
.fc-choice.correct .ltr { color:var(--green); }
.fc-expl {
  font-size:0.81rem; line-height:1.7; color:var(--text2);
  border-top:1px solid var(--border); padding-top:0.75rem;
}
.fc-ratings {
  display:flex; gap:0.5rem; width:100%; max-width:700px;
  justify-content:center; flex-wrap:wrap; margin-top:0.25rem;
}
.fc-rate {
  display:flex; flex-direction:column; align-items:center; gap:0.15rem;
  padding:0.6rem 1rem; border-radius:var(--r);
  border:1.5px solid var(--border); background:var(--panel);
  cursor:pointer; transition:all 0.18s var(--ease);
  font-family:var(--ff-head); min-width:90px;
}
.fc-rate:hover { transform:translateY(-2px); box-shadow:0 4px 16px rgba(0,0,0,0.3); }
.fc-rate .ri { font-size:1.2rem; }
.fc-rate .rl { font-size:0.72rem; font-weight:700; }
.fc-rate .rs { font-size:0.62rem; color:var(--text3); }
.fc-r-again { border-color:var(--red);    color:var(--red);      }
.fc-r-hard  { border-color:var(--amber);  color:var(--amber);    }
.fc-r-good  { border-color:var(--blue);   color:var(--blue-lt);  }
.fc-r-easy  { border-color:var(--green);  color:var(--green);    }
.fc-r-again:hover { background:var(--red-glow);   }
.fc-r-hard:hover  { background:var(--amber-glow); }
.fc-r-good:hover  { background:var(--blue-glow);  }
.fc-r-easy:hover  { background:var(--green-glow); }
.fc-complete {
  display:flex; flex-direction:column; align-items:center;
  text-align:center; padding:3rem 2rem; max-width:460px; margin:auto;
}
.fc-cstats {
  display:grid; grid-template-columns:repeat(4,1fr);
  gap:0.6rem; width:100%; margin-bottom:1.75rem;
}
.fc-cstat {
  background:var(--panel); border:1px solid var(--border);
  border-radius:var(--r); padding:0.75rem 0.4rem; text-align:center;
}
.fc-cstat .cv { font-size:1.4rem; font-weight:800; margin-bottom:0.15rem; }
.fc-cstat .cl { font-size:0.65rem; color:var(--text3); font-weight:600; letter-spacing:0.05em; text-transform:uppercase; }
.fc-cactions { display:flex; gap:0.6rem; flex-wrap:wrap; justify-content:center; }
.fc-btn-p {
  padding:0.65rem 1.4rem; border-radius:var(--r); border:none;
  background:var(--violet); color:#fff; font-weight:700;
  font-size:0.88rem; cursor:pointer; transition:all 0.18s;
  font-family:var(--ff-head);
}
.fc-btn-p:hover { background:var(--violet-lt); }
.fc-btn-s {
  padding:0.65rem 1.4rem; border-radius:var(--r);
  border:1.5px solid var(--border); background:var(--panel);
  color:var(--text2); font-weight:600; font-size:0.88rem;
  cursor:pointer; transition:all 0.18s; font-family:var(--ff-head);
}
.fc-btn-s:hover { background:var(--bg3); color:var(--text); }


.mode-card.flash{
  background:linear-gradient(135deg,rgba(139,92,246,0.08) 0%,rgba(99,102,241,0.05) 100%);
  border-color:rgba(139,92,246,0.25);
}
.mode-card.flash:hover{
  border-color:var(--violet);
  box-shadow:0 0 0 1px var(--violet),0 8px 32px var(--violet-glow);
  transform:translateY(-3px);
}
.mode-card.flash .mode-arrow{color:var(--violet-lt)}
/* 3 columns for mode grid */
.mode-grid{grid-template-columns:repeat(3,1fr)!important}


/* ── Flashcard front-face choices (no highlight — student picks mentally) ── */
.fc-choices-front {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.35rem;
  margin: 0.75rem 0 0.85rem;
}
.fc-choice-front {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  padding: 0.45rem 0.65rem;
  border-radius: var(--r2);
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--text2);
  font-size: 0.8rem;
  line-height: 1.4;
}
.fc-choice-ltr {
  font-weight: 700;
  font-size: 0.72rem;
  color: var(--text3);
  flex-shrink: 0;
  margin-top: 0.05rem;
}

/* ── SVG inside flashcard — constrained, dark-themed ── */
.fc-passage-svg {
  margin-bottom: 0.75rem;
}
.fc-passage-svg svg,
.fc-face svg {
  width: 100% !important;
  max-width: 480px !important;
  height: auto !important;
  display: block;
  margin: 0 auto 0.5rem;
  border-radius: var(--r2);
  background: var(--bg3);
  border: 1px solid var(--border);
  padding: 0.25rem;
}

/* ── Card min-height adapts to content ── */
.fc-face {
  min-height: unset !important;
  position: relative !important;
}
.fc-back {
  position: absolute !important;
}
.fc-inner {
  min-height: 300px;
}


/* ══════════════════════════════════════════════════════════════════════
   PERSISTENCE WIDGETS (Resume banner, Past Attempts, Reset link, badges)
   ══════════════════════════════════════════════════════════════════════ */

/* Resume banner — sits at the very top of the home screen */
.resume-banner {
  display:flex; align-items:center; justify-content:space-between;
  gap:1rem; padding:0.85rem 1.25rem;
  background:linear-gradient(135deg, rgba(139,92,246,0.18), rgba(59,130,246,0.18));
  border-bottom:1px solid var(--violet);
  color:var(--text); font-size:0.95rem;
}
.resume-text { flex:1; min-width:0; }
.resume-text strong { color:var(--violet-lt); }
.resume-actions { display:flex; gap:0.5rem; }
.resume-btn {
  background:var(--violet); color:#fff; border:0; padding:0.45rem 1rem;
  border-radius:6px; font-weight:600; font-size:0.85rem; cursor:pointer;
}
.resume-btn:hover { background:var(--violet-lt); }
.resume-discard {
  background:transparent; color:var(--text2); border:1px solid var(--border2);
  padding:0.45rem 0.9rem; border-radius:6px; font-size:0.85rem; cursor:pointer;
}
.resume-discard:hover { color:var(--text); border-color:var(--text2); }

/* Past Attempts card */
.past-attempts {
  max-width:720px; margin:1.5rem auto 0;
  background:var(--panel); border:1px solid var(--border);
  border-radius:var(--r); padding:1rem 1.25rem;
}
.pa-title {
  font-size:0.78rem; font-weight:700; letter-spacing:0.08em;
  text-transform:uppercase; color:var(--text3); margin-bottom:0.6rem;
}
.pa-list { display:flex; flex-direction:column; gap:0.4rem; }
.pa-item {
  display:grid; grid-template-columns: 90px 1fr auto; align-items:center;
  gap:0.75rem; padding:0.4rem 0;
  border-top:1px solid var(--border);
  font-size:0.85rem; color:var(--text2);
}
.pa-item:first-child { border-top:0; }
.pa-date { font-family:var(--ff-mono); color:var(--text3); font-size:0.78rem; }
.pa-scores { color:var(--text2); }
.pa-total {
  font-weight:800; color:var(--blue-lt); font-size:1.05rem;
  font-family:var(--ff-head);
}

/* Reset Progress link — subtle, at the bottom of the home screen */
.home-footer { text-align:center; padding:2rem 0 1.5rem; }
.reset-progress-link {
  background:transparent; border:0; color:var(--text3);
  font-size:0.8rem; font-family:var(--ff-head); cursor:pointer;
  text-decoration:underline; text-underline-offset:2px;
}
.reset-progress-link:hover { color:var(--red-lt); }

/* Per-topic accuracy badge in the drill sidebar */
.topic-stats {
  font-size:0.72rem; font-family:var(--ff-mono); color:var(--text3);
  margin-left:auto; padding-left:0.5rem; font-weight:600;
  white-space:nowrap; flex-shrink:0;
}
.topic-btn.active .topic-stats { color:var(--text); }

/* Drill mode toggle — "Wrong only" pill button in the drill header */
.drill-mode-toggle {
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  background: var(--bg3);
  border: 1px solid var(--border2);
  color: var(--text3);
  font-family: var(--ff-head);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s var(--ease);
  white-space: nowrap;
}
.drill-mode-toggle:hover {
  background: var(--panel);
  color: var(--text);
  border-color: var(--text3);
}
.drill-mode-toggle.active {
  background: rgba(245,158,11,0.15);
  border-color: var(--amber);
  color: var(--amber-lt);
}

/* "N due" badge on each flashcard deck button */
.fc-deck-due {
  display:inline-block; margin-left:0.4rem; font-size:0.7rem;
  color:var(--amber); font-weight:700;
  background:rgba(245,158,11,0.12); padding:1px 6px; border-radius:4px;
}

/* ══════════════════════════════════════════════════════════════════════
   RESPONSIVE OVERHAUL
   ───────────────────────────────────────────────────────────────────
   Breakpoints
     • base / desktop: 769px and up — original layout
     • tablet: 481–768px
     • mobile: ≤480px
   Strategy: desktop styles above remain the baseline.
   Tablet and mobile rules below override what would break on a narrow
   viewport. Sidebars become horizontal-scroll tab strips on small
   screens, multi-column grids collapse to single columns, touch
   targets are bumped to 44px, and any SVG inside passages gets a
   max-width:100% safety net.
   ══════════════════════════════════════════════════════════════════════ */

/* ── Universal safety net (every viewport) ────────────────────────── */
html, body { overflow-x: hidden; }
img, svg { max-width: 100%; }
.drill-passage svg, .drill-passage-text svg,
.test-passage-panel svg, .passage-panel svg,
.missed-item svg {
  max-width: 100% !important;
  height: auto !important;
  display: block;
  margin: 0 auto;
}

/* ── Tablet AND mobile (≤ 768px) ─────────────────────────────────── */
@media (max-width: 768px) {
  /* Drill mode toggle on mobile — 44px touch target */
  .drill-mode-toggle { min-height: 44px; padding: 0.5rem 0.9rem; }
  /* HOME — single-column mode grid, looser spacing */
  .home-nav { padding: 1rem 1.25rem; flex-wrap: wrap; gap: 0.5rem; }
  .home-hero { padding: 2rem 1.25rem 1rem; }
  .home-heading h1 { font-size: clamp(1.6rem, 7vw, 2.6rem); }
  .home-sub { font-size: 0.92rem; max-width: 100%; }
  .mode-grid {
    grid-template-columns: 1fr !important;
    max-width: 100%; gap: 0.9rem;
  }
  .mode-card { padding: 1.25rem; }
  .stats-strip { flex-wrap: wrap; gap: 0.6rem 1rem; padding: 1rem 0.5rem; }
  .stat-div { display: none; }
  .resume-banner {
    flex-direction: column; align-items: stretch; gap: 0.75rem;
    padding: 0.75rem 1rem;
  }
  .resume-actions { display: flex; gap: 0.5rem; }
  .resume-btn, .resume-discard { flex: 1; min-height: 44px; }
  .past-attempts { margin: 1.5rem 1rem 0; max-width: 100%; }
  .pa-item {
    grid-template-columns: 1fr auto;
    gap: 0.5rem 0.75rem;
  }
  .pa-date { grid-column: 1 / -1; font-size: 0.72rem; }

  /* DRILL — sidebar becomes a horizontal-scroll tab strip on top */
  .drill-header { padding: 0.75rem 1rem; flex-wrap: wrap; gap: 0.5rem; }
  .drill-layout { flex-direction: column; }
  .drill-sidebar {
    width: 100%; max-height: none;
    border-right: 0; border-bottom: 1px solid var(--border);
    padding: 0.5rem 0.75rem; overflow-x: auto; overflow-y: hidden;
    display: flex; gap: 1rem; flex-shrink: 0;
  }
  .drill-sidebar-section,
  .sidebar-section {
    margin-bottom: 0;
    display: flex; flex-direction: row; gap: 0.4rem;
    align-items: center; flex-shrink: 0;
  }
  .drill-sidebar-section .drill-section-label,
  .sidebar-section .sidebar-section-label {
    margin-bottom: 0; padding-bottom: 0; border-bottom: 0;
    padding-right: 0.5rem; white-space: nowrap;
    border-right: 1px solid var(--border);
    margin-right: 0.4rem;
  }
  .topic-btn {
    width: auto; flex: 0 0 auto;
    padding: 0.65rem 0.9rem;
    margin-bottom: 0; min-height: 44px;
    white-space: nowrap;
  }
  .topic-stats { margin-left: 0.35rem; padding-left: 0; }
  .drill-main { padding: 1.25rem 1rem; }
  .drill-q-wrap { padding: 1rem 0; }
  .drill-question-box { padding: 1.25rem; }

  /* TEST SETUP — single-column card grid, full-width Start button */
  .setup-wrap { padding: 1.25rem; max-width: 100%; }
  .setup-cards { grid-template-columns: 1fr !important; gap: 0.75rem; }
  .start-test-btn { min-height: 48px; font-size: 0.95rem; }

  /* TEST — stack passage above question, slim top bar */
  .test-topbar {
    padding: 0.6rem 0.75rem; gap: 0.5rem;
    flex-wrap: wrap;
  }
  .test-topbar-left, .test-topbar-right {
    display: flex; align-items: center; gap: 0.5rem;
    flex-wrap: wrap;
  }
  .test-topbar-right { flex: 1; justify-content: flex-end; }
  .test-body { padding: 1rem 0.85rem; }
  .test-q-layout, .test-q-layout.no-passage {
    grid-template-columns: 1fr !important;
    gap: 1rem; max-width: 100%;
  }
  .passage-panel, .test-passage-panel {
    position: static; max-height: 40vh; padding: 1rem;
    font-size: 0.88rem;
  }
  .question-panel, .test-q-panel { padding: 1.25rem; }
  .test-q-stem { font-size: 0.95rem; }
  .test-choice {
    min-height: 44px; padding: 0.75rem 0.85rem;
    font-size: 0.92rem;
  }
  .tc-letter, .choice-letter { width: 30px; height: 30px; font-size: 0.8rem; }
  .test-bottombar {
    flex-direction: column; gap: 0.6rem; padding: 0.75rem;
  }
  .test-dots { width: 100%; justify-content: center; gap: 6px; }
  /* WCAG 2.1 touch target: bump question-navigation dots from 20px to 44px on mobile */
  .q-dot {
    width: 44px; height: 44px;
    border-radius: 8px;
    font-size: 0.85rem;
  }
  .test-next-btn {
    width: 100%; min-height: 48px; font-size: 0.95rem;
  }

  /* RESULTS — stack the two score sections, full-width actions */
  #results { padding: 1.25rem; }
  .results-score-ring { width: 120px; height: 120px; }
  .results-score-ring::before { width: 92px; height: 92px; }
  .ring-number { font-size: 1.6rem; }
  .results-title { font-size: 1.3rem; }
  .results-sub { font-size: 0.88rem; }
  .score-breakdown { grid-template-columns: 1fr !important; }
  .results-actions { grid-template-columns: 1fr !important; }
  .action-btn { min-height: 44px; }
  .adaptive-note { padding: 1rem; }
  .missed-section { padding: 1rem; }

  /* FLASHCARDS — sidebar on top as scrollable tab strip */
  .fc-header { padding: 0.75rem 1rem; }
  .fc-header > div[style*="width:80px"] { display: none; }
  .fc-layout { flex-direction: column; overflow: visible; }
  .fc-sidebar {
    width: 100%; max-height: none;
    border-right: 0; border-bottom: 1px solid var(--border);
    padding: 0.5rem 0.75rem; overflow-x: auto; overflow-y: hidden;
    display: flex; gap: 0.75rem; flex-shrink: 0;
  }
  .fc-sidebar-group {
    margin-bottom: 0;
    display: flex; flex-direction: row; gap: 0.35rem;
    align-items: center; flex-shrink: 0;
  }
  .fc-sidebar-label {
    margin: 0; padding: 0 0.5rem 0 0;
    white-space: nowrap; border-right: 1px solid var(--border);
    margin-right: 0.25rem; line-height: 1;
  }
  .fc-deck-btn {
    width: auto; flex: 0 0 auto;
    padding: 0.6rem 0.85rem; min-height: 44px;
    border-left: 0; border-radius: var(--r2);
    white-space: nowrap; background: var(--bg3);
  }
  .fc-deck-btn.active {
    border-left: 0; background: rgba(139,92,246,0.18);
  }
  .fc-stats-box {
    flex: 0 0 auto; margin: 0; padding: 0.5rem 0.75rem;
    display: flex; gap: 0.75rem; align-items: center;
    white-space: nowrap;
  }
  .fc-stat-row { padding: 0; gap: 0.3rem; }
  .fc-restart {
    width: auto; padding: 0.4rem 0.75rem; margin: 0;
    min-height: 36px;
  }
  .fc-main { padding: 1rem; }
  .fc-scene { max-width: 100%; }
  .fc-progress-wrap { max-width: 100%; }
  .fc-choices-front { grid-template-columns: 1fr !important; gap: 0.3rem; }
  .fc-ratings {
    flex-wrap: wrap; max-width: 100%;
    display: grid !important; grid-template-columns: 1fr 1fr !important;
    gap: 0.5rem;
  }
  .fc-rate { min-width: 0; min-height: 56px; padding: 0.5rem; }

  /* Universal: make every meaningful button hit 44px */
  .back-btn, .drill-nav-btn, .mode-card, .reset-progress-link {
    min-height: 44px;
  }
  .drill-choice { min-height: 44px; }
}

/* ── Mobile-only (≤ 480px) ──────────────────────────────────────── */
@media (max-width: 480px) {
  /* Tighten everything one more notch */
  .home-nav { padding: 1rem 1rem; }
  .home-logo-img { height: 72px; }
  .home-hero { padding: 1.5rem 1rem 0.75rem; }
  .home-heading h1 {
    font-size: clamp(1.4rem, 8vw, 2rem);
    line-height: 1.15;
  }
  .home-sub { font-size: 0.85rem; line-height: 1.55; }
  .mode-card { padding: 1rem; }
  .mode-icon { font-size: 1.4rem; }
  .mode-title { font-size: 0.95rem; }
  .mode-desc { font-size: 0.78rem; }
  .stats-strip { padding: 0.75rem 0.25rem; gap: 0.4rem 0.85rem; }
  .stat-num { font-size: 1.1rem; }
  .stat-lbl { font-size: 0.6rem; }

  .drill-header { padding: 0.6rem 0.75rem; }
  .drill-current-topic { font-size: 0.85rem; }
  .drill-main { padding: 1rem 0.75rem; }
  .drill-question-box { padding: 1rem; }

  .setup-card { padding: 1.25rem; }
  .setup-card-title { font-size: 1rem; }
  .setup-card-sub, .setup-card-detail { font-size: 0.78rem; }

  .test-topbar { padding: 0.55rem 0.65rem; }
  .timer { font-size: 0.92rem; padding: 0.3rem 0.7rem; }
  .test-body { padding: 0.85rem 0.65rem; }
  .question-panel, .test-q-panel { padding: 1rem; }
  .test-q-stem { font-size: 0.9rem; line-height: 1.6; }
  .test-choice { padding: 0.7rem; font-size: 0.88rem; }
  .test-bottombar { padding: 0.65rem; }

  #results { padding: 1rem 0.85rem; }
  .results-score-ring { width: 104px; height: 104px; }
  .results-score-ring::before { width: 78px; height: 78px; }
  .ring-number { font-size: 1.4rem; }
  .results-title { font-size: 1.2rem; }
  .score-section { padding: 1rem; }

  .fc-header { padding: 0.6rem 0.75rem; }
  .fc-title { font-size: 0.92rem; }
  .fc-main { padding: 0.75rem; }
  .fc-question { font-size: 0.92rem; line-height: 1.5; }
  .fc-rate { min-height: 52px; padding: 0.4rem; }
  .fc-rate .ri { font-size: 1.05rem; }
  .fc-rate .rl { font-size: 0.7rem; }
  .fc-rate .rs { font-size: 0.6rem; }

  .past-attempts { margin: 1rem 0.75rem 0; padding: 0.75rem 0.85rem; }
  .pa-item { font-size: 0.8rem; gap: 0.3rem 0.5rem; }
  .pa-total { font-size: 0.95rem; }
}

/* ══════════════════════════════════════════════════════════════════════
   ANALYTICS DASHBOARD
   ───────────────────────────────────────────────────────────────────
   Predicted score · skill heatmap · progress trend.
   Renders into #analytics-card on the home screen.
   ══════════════════════════════════════════════════════════════════════ */
.analytics-card {
  max-width: 720px; width: calc(100% - 2rem);
  margin: 1.5rem auto 0;
  background: var(--panel); border: 1px solid var(--border);
  border-radius: var(--r); padding: 1.25rem;
}
.analytics-header {
  font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--text3);
  margin-bottom: 0.85rem;
}
.analytics-section { margin-bottom: 1.25rem; }
.analytics-section:last-child { margin-bottom: 0; }
.an-section-title {
  font-size: 0.92rem; font-weight: 700; color: var(--text);
  margin-bottom: 0.6rem;
}
.an-section-hint {
  font-size: 0.72rem; color: var(--text3); margin-top: 0.55rem;
  line-height: 1.5;
}

/* ── 1. Predicted score ────────────────────────────────────────────── */
.an-prediction {
  display: grid; grid-template-columns: 1fr 1fr; gap: 0.9rem;
  align-items: stretch;
}
.an-pred-total, .an-pred-block {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--r2); padding: 0.85rem 1rem;
  display: flex; flex-direction: column; justify-content: center;
}
.an-pred-num {
  font-family: var(--ff-head); font-weight: 800;
  font-size: 2rem; line-height: 1;
  color: var(--blue-lt); margin-bottom: 0.2rem;
}
.an-pred-lbl {
  font-size: 0.68rem; color: var(--text3);
  letter-spacing: 0.06em; text-transform: uppercase;
}
.an-pred-split {
  display: grid; grid-template-columns: 1fr; gap: 0.5rem;
}
.an-pred-sub-num {
  font-family: var(--ff-head); font-weight: 700;
  font-size: 1.15rem; line-height: 1;
}
.an-pred-sub-lbl {
  font-size: 0.66rem; color: var(--text3);
  letter-spacing: 0.05em; text-transform: uppercase;
  margin-top: 0.25rem;
}
.an-pred-rw .an-pred-sub-num   { color: var(--blue-lt); }
.an-pred-math .an-pred-sub-num { color: var(--green-lt); }

/* ── 2. Skill heatmap ──────────────────────────────────────────────── */
.an-heat-list { display: flex; flex-direction: column; gap: 0.45rem; }
.an-heat-row {
  display: grid;
  grid-template-columns: minmax(140px, 1fr) minmax(80px, 2fr) auto;
  align-items: center; gap: 0.75rem;
  font-size: 0.82rem;
}
.an-heat-label { color: var(--text2); font-weight: 600; }
.an-heat-track {
  height: 8px; background: var(--bg3);
  border-radius: 99px; overflow: hidden;
  border: 1px solid var(--border);
}
.an-heat-fill {
  height: 100%; border-radius: 99px;
  transition: width 0.6s var(--ease);
}
.an-bar-green { background: linear-gradient(90deg, var(--green), var(--green-lt)); }
.an-bar-amber { background: linear-gradient(90deg, var(--amber), var(--amber-lt)); }
.an-bar-red   { background: linear-gradient(90deg, var(--red),   var(--red-lt));   }
.an-heat-meta {
  display: flex; gap: 0.5rem; align-items: baseline;
  font-family: var(--ff-mono); font-size: 0.78rem;
  white-space: nowrap;
}
.an-heat-pct { font-weight: 700; color: var(--text); }
.an-heat-count { color: var(--text3); font-size: 0.72rem; }
.an-legend-g { color: var(--green-lt); }
.an-legend-a { color: var(--amber-lt); }
.an-legend-r { color: var(--red-lt); }

/* ── 3. Trend SVG ──────────────────────────────────────────────────── */
.an-trend-svg {
  display: block; width: 100%; height: auto;
  max-width: 100%; margin: 0 auto;
}
.an-trend-grid {
  stroke: var(--border); stroke-width: 1;
  stroke-dasharray: 2 3; opacity: 0.6;
}
.an-trend-axis, .an-trend-x {
  fill: var(--text3); font-size: 9px;
  font-family: var(--ff-mono);
}
.an-trend-val {
  fill: var(--blue-lt); font-size: 9px;
  font-family: var(--ff-mono); font-weight: 700;
}
.an-trend-line {
  stroke: var(--blue-lt); stroke-width: 2;
  stroke-linejoin: round; stroke-linecap: round;
}
.an-trend-dot { fill: var(--blue-lt); }

/* ── Mobile + tablet (≤ 768px) ─────────────────────────────────────── */
@media (max-width: 768px) {
  .analytics-card {
    width: calc(100% - 1.5rem); margin: 1rem auto 0;
    padding: 1rem;
  }
  /* Stack the prediction blocks vertically */
  .an-prediction { grid-template-columns: 1fr; gap: 0.6rem; }
  .an-pred-num { font-size: 1.8rem; }
  .an-pred-split { grid-template-columns: 1fr 1fr; gap: 0.6rem; }

  /* Heatmap row collapses to two stacked lines */
  .an-heat-row {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "label meta"
      "track track";
    gap: 0.25rem 0.5rem;
  }
  .an-heat-label { grid-area: label; }
  .an-heat-meta  { grid-area: meta; }
  .an-heat-track { grid-area: track; }
}

@media (max-width: 480px) {
  .analytics-card { padding: 0.85rem; }
  .an-pred-num { font-size: 1.5rem; }
  .an-pred-sub-num { font-size: 1rem; }
  .an-heat-label { font-size: 0.78rem; }
  .an-trend-axis, .an-trend-x, .an-trend-val { font-size: 10px; }
}