/* ── Reset & Base ─────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0d0f14;
  --surface: #161a23;
  --surface2: #1e2330;
  --border: #2a2f3e;
  --accent: #6c63ff;
  --accent2: #00d4aa;
  --accent3: #ff6b6b;
  --text: #e8eaf0;
  --muted: #7a8099;
  --correct: #00d4aa;
  --wrong: #ff6b6b;
  --warn: #ffb347;
  --radius: 14px;
  --radius-sm: 10px;
}

html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Header ───────────────────────────────────────────── */
.site-header {
  background: linear-gradient(135deg, #1a1040 0%, #0d1a2e 50%, #0d0f14 100%);
  padding: 52px 24px 44px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.site-header::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(108,99,255,0.15) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 30%, rgba(0,212,170,0.1) 0%, transparent 50%);
  pointer-events: none;
}
.header-inner { position: relative; max-width: 700px; margin: 0 auto; }

.header-badge {
  display: inline-block;
  background: rgba(108,99,255,0.2);
  border: 1px solid rgba(108,99,255,0.4);
  color: #a89fff;
  font-size: 11px; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 5px 14px; border-radius: 999px;
  margin-bottom: 18px;
}

.header-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: clamp(1.7rem, 4.5vw, 2.8rem);
  font-weight: 700; color: #fff;
  line-height: 1.2; margin-bottom: 10px;
}

.header-sub { color: var(--muted); font-size: 13px; margin-bottom: 28px; }

.progress-wrap { display: flex; align-items: center; gap: 12px; justify-content: center; }
.progress-bar {
  flex: 1; max-width: 380px; height: 5px;
  background: rgba(255,255,255,0.08);
  border-radius: 999px; overflow: hidden;
}
.progress-fill {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #6c63ff, #00d4aa);
  border-radius: 999px;
  transition: width 0.4s ease;
}
.progress-label { font-size: 12px; color: var(--muted); white-space: nowrap; }

/* ── Container ────────────────────────────────────────── */
.container { max-width: 860px; margin: 0 auto; padding: 40px 20px 60px; }

/* ── Section Block ────────────────────────────────────── */
.section-block { margin-bottom: 52px; }

.section-header {
  display: flex; align-items: center; gap: 14px;
  flex-wrap: wrap; margin-bottom: 8px;
}
.section-tag {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  color: #fff; font-size: 11px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 4px 12px; border-radius: 999px;
}
.section-header h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.2rem; font-weight: 700; color: #fff;
}
.marks-badge {
  margin-left: auto;
  background: rgba(0,212,170,0.12);
  border: 1px solid rgba(0,212,170,0.3);
  color: var(--accent2);
  font-size: 12px; font-weight: 600;
  padding: 4px 12px; border-radius: 999px;
}
.section-note { font-size: 13px; color: var(--muted); margin-bottom: 18px; }

/* ── Card ─────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 14px;
  transition: border-color 0.2s;
}
.card:hover { border-color: rgba(108,99,255,0.25); }
.card.correct { border-color: var(--correct); background: rgba(0,212,170,0.04); }
.card.wrong   { border-color: var(--wrong);   background: rgba(255,107,107,0.04); }
.card.partial { border-color: var(--warn);    background: rgba(255,179,71,0.04); }

.q-num { color: var(--accent); font-weight: 700; margin-right: 4px; }
.q-text { font-size: 14.5px; font-weight: 500; color: var(--text); margin-bottom: 14px; }
.marks-tag {
  font-size: 11px; font-weight: 600; color: var(--muted);
  background: var(--surface2); border: 1px solid var(--border);
  padding: 2px 8px; border-radius: 6px; margin-left: 6px;
}
.blank-line {
  display: inline-block;
  width: 100px; border-bottom: 2px solid var(--accent);
  margin: 0 4px; vertical-align: bottom;
}

/* ── MCQ Options ──────────────────────────────────────── */
.opts { display: flex; flex-direction: column; gap: 8px; }

.opt {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  text-align: left; font-size: 13.5px;
  cursor: pointer; transition: all 0.15s;
  font-family: 'Inter', sans-serif;
}
.opt:hover:not(:disabled) { border-color: var(--accent); background: rgba(108,99,255,0.1); color: #fff; }
.opt.selected  { border-color: var(--accent); background: rgba(108,99,255,0.15); color: #fff; }
.opt.correct-ans { border-color: var(--correct) !important; background: rgba(0,212,170,0.15) !important; color: var(--correct) !important; }
.opt.wrong-ans   { border-color: var(--wrong)   !important; background: rgba(255,107,107,0.15) !important; color: var(--wrong)   !important; }
.opt:disabled { cursor: default; }

/* ── True / False ─────────────────────────────────────── */
.tf-group { display: flex; gap: 10px; }
.tf {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 10px; font-size: 13.5px;
  cursor: pointer; transition: all 0.15s;
  font-family: 'Inter', sans-serif;
}
.tf:hover:not(:disabled) { border-color: var(--accent); background: rgba(108,99,255,0.1); }
.tf.selected  { border-color: var(--accent); background: rgba(108,99,255,0.15); color: #fff; }
.tf.correct-ans { border-color: var(--correct) !important; background: rgba(0,212,170,0.15) !important; color: var(--correct) !important; }
.tf.wrong-ans   { border-color: var(--wrong)   !important; background: rgba(255,107,107,0.15) !important; color: var(--wrong)   !important; }
.tf:disabled { cursor: default; }

/* ── Text Inputs ──────────────────────────────────────── */
.fill-inp, textarea {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  padding: 10px 14px;
  outline: none;
  transition: border-color 0.2s;
  resize: vertical;
}
.fill-inp:focus, textarea:focus { border-color: var(--accent); }
.fill-inp::placeholder, textarea::placeholder { color: var(--muted); }
.fill-inp.correct-inp { border-color: var(--correct); background: rgba(0,212,170,0.05); }
.fill-inp.wrong-inp   { border-color: var(--wrong);   background: rgba(255,107,107,0.05); }
textarea.partial-inp  { border-color: var(--warn);    background: rgba(255,179,71,0.05); }
textarea.correct-inp  { border-color: var(--correct); background: rgba(0,212,170,0.05); }
textarea.wrong-inp    { border-color: var(--wrong);   background: rgba(255,107,107,0.05); }

/* ── Feedback ─────────────────────────────────────────── */
.fb {
  margin-top: 10px; font-size: 13px;
  border-radius: 8px; padding: 0;
  max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.fb.show { max-height: 300px; padding: 10px 12px; }
.fb.ok   { background: rgba(0,212,170,0.1);  color: var(--correct); border: 1px solid rgba(0,212,170,0.25); }
.fb.err  { background: rgba(255,107,107,0.1); color: var(--wrong);   border: 1px solid rgba(255,107,107,0.25); }
.fb.warn { background: rgba(255,179,71,0.1);  color: var(--warn);    border: 1px solid rgba(255,179,71,0.25); }

/* ── Passage Box ──────────────────────────────────────── */
.passage-box {
  background: linear-gradient(135deg, rgba(108,99,255,0.07), rgba(0,212,170,0.04));
  border: 1px solid rgba(108,99,255,0.22);
  border-radius: var(--radius);
  padding: 20px 24px; margin-bottom: 20px;
}
.passage-label { font-weight: 700; color: #a89fff; margin-bottom: 10px; font-size: 13px; display: block; }
.passage-box p:last-child { font-size: 14px; color: var(--text); line-height: 1.8; }

/* ── Action Row ───────────────────────────────────────── */
.action-row {
  display: flex; gap: 12px; justify-content: center;
  margin: 40px 0 32px; flex-wrap: wrap;
}

.btn-submit {
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  color: #fff; border: none;
  border-radius: 12px; padding: 14px 36px;
  font-size: 15px; font-weight: 700;
  cursor: pointer; font-family: 'Space Grotesk', sans-serif;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 0 4px 20px rgba(108,99,255,0.35);
}
.btn-submit:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(108,99,255,0.5); }
.btn-submit:active { transform: translateY(0); }

.btn-reset {
  background: var(--surface2);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 28px;
  font-size: 15px; font-weight: 600;
  cursor: pointer; font-family: 'Space Grotesk', sans-serif;
  transition: all 0.15s;
}
.btn-reset:hover { border-color: var(--accent); color: var(--text); }

/* ── Results Panel ────────────────────────────────────── */
.results-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 44px 32px;
  margin-bottom: 40px;
  text-align: center;
}

.score-circle {
  display: flex; align-items: baseline;
  justify-content: center; gap: 6px;
  margin-bottom: 14px;
}
.score-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 5rem; font-weight: 800;
  background: linear-gradient(135deg, #6c63ff, #00d4aa);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; line-height: 1;
}
.score-denom { font-size: 2rem; color: var(--muted); font-weight: 600; }

.grade-text {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.5rem; font-weight: 700; margin-bottom: 8px;
}
.grade-msg { color: var(--muted); font-size: 14px; margin-bottom: 28px; }

.topic-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px; margin-bottom: 24px; text-align: left;
}
.topic-box {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.topic-box h3 { font-size: 13px; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; }

.tag {
  font-size: 12px; font-weight: 600;
  padding: 5px 12px; border-radius: 999px;
}
.tag-err { background: rgba(255,107,107,0.15); color: var(--wrong);   border: 1px solid rgba(255,107,107,0.3); }
.tag-ok  { background: rgba(0,212,170,0.15);   color: var(--correct); border: 1px solid rgba(0,212,170,0.3); }

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 600px) {
  .site-header { padding: 36px 16px 32px; }
  .container { padding: 28px 14px 48px; }
  .topic-grid { grid-template-columns: 1fr; }
  .score-num { font-size: 3.5rem; }
  .results-panel { padding: 28px 18px; }
  .section-header { gap: 10px; }
  .marks-badge { margin-left: 0; }
}