/* Quantrex Academy — Premium coaching-brand UI shell
   Does NOT alter exam diagrams, logos, or book covers. */

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+Devanagari:wght@400;500;600;700&family=Poppins:wght@500;600;700;800&display=swap");

:root {
  --primary: #0D9488;
  --primary-dark: #0F766E;
  --primary-light: #CCFBF1;
  --accent: #4F46E5;
  --accent-light: #E0E7FF;
  --green: #16A34A;
  --green-light: #DCFCE7;
  --red: #DC2626;
  --red-light: #FEE2E2;
  --orange: #F59E0B;
  --orange-light: #FEF3C7;
  --purple: #7C3AED;
  --purple-light: #EDE9FE;
  --bg: #F8FAFC;
  --card: #FFFFFF;
  --white: #FFFFFF;
  --border: #E2E8F0;
  --text: #0F172A;
  --dark: #0F172A;
  --gray: #64748B;
  --shadow: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --radius-card: 12px;
  --radius-btn: 8px;
  --radius-pill: 999px;
  --qx-gradient: linear-gradient(135deg, #0D9488 0%, #4F46E5 100%);
  --qx-font-display: "Poppins", "Inter", "Noto Sans Devanagari", system-ui, sans-serif;
  --qx-font-body: "Inter", "Noto Sans Devanagari", system-ui, sans-serif;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
}

[data-theme="dark"] {
  --bg: #0F172A;
  --card: #1E293B;
  --white: #1E293B;
  --border: #334155;
  --text: #E2E8F0;
  --dark: #E2E8F0;
  --gray: #94A3B8;
  --primary-light: #134E4A;
  --accent-light: #312E81;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
}

html, body {
  font-family: var(--qx-font-body);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* Typography */
.page-head h1,
.sidebar-head .logo-text,
.mtk-brand-text,
h1, h2 {
  font-family: var(--qx-font-display);
  letter-spacing: -0.02em;
}

.page-head h1 { font-size: 22px; font-weight: 700; }
.mtk-q-text,
.qx-prac-q,
.qx-content,
.mtk-opt-text,
.qx-prac-opt-text {
  font-size: 16px;
  line-height: 1.65;
  font-weight: 400;
}

.mtk-opt-text,
.qx-prac-opt-text {
  font-size: 15px;
  line-height: 1.55;
}

/* MathJax scale match body */
mjx-container {
  font-size: 105% !important;
  line-height: 1.4;
  overflow-x: auto;
  max-width: 100%;
}
.mtk-opt-text mjx-container,
.qx-prac-opt-text mjx-container {
  font-size: 100% !important;
}

/* Cards */
.dash-card, .book-card, .qx-book-card, .subj-card, .ch-card, .exam-card,
.exam-pill-card, .cpyqb-exam-tile, .dash-tool-card, .dpp-set-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.dash-card:hover, .book-card:hover:not(.soon), .qx-book-card:hover:not(.soon),
.subj-card:hover, .ch-card:hover, .exam-card:hover, .exam-pill-card:hover,
.cpyqb-exam-tile:hover, .dash-tool-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Buttons */
.btn-primary, .btn-primary.big, .mtk-btn-save, .qx-prac-next {
  background: var(--qx-gradient) !important;
  border: none !important;
  border-radius: var(--radius-btn) !important;
  box-shadow: 0 4px 14px rgba(13, 148, 136, 0.28);
  font-weight: 700;
  transition: transform 0.12s ease, filter 0.12s ease;
}
.btn-primary:active, .mtk-btn-save:active {
  transform: scale(0.97);
}
.btn-soft, .btn-secondary {
  border-radius: var(--radius-btn) !important;
  border: 1px solid var(--primary) !important;
  color: var(--primary-dark) !important;
  background: transparent !important;
}

/* Nav shell */
.sidebar {
  background: var(--card);
  border-right: 1px solid var(--border);
}
.nav-item {
  border-radius: 10px;
  color: var(--gray);
  font-weight: 600;
  gap: 12px;
  padding: 11px 14px;
}
.nav-item .ic {
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.nav-item.active {
  background: var(--primary-light) !important;
  color: var(--primary-dark) !important;
  box-shadow: inset 3px 0 0 var(--primary);
  font-weight: 700;
}
[data-theme="dark"] .nav-item.active {
  color: var(--primary) !important;
}

/* Question screen polish — theme-aware (see qx-theme-practice.css for practice shell) */
.mtk-test-root[data-test-theme="light"] .mtk-main {
  background: #f8fafc;
}
.mtk-options .mtk-opt,
.qx-prac-opts .qx-prac-opt {
  border-radius: var(--radius-card);
  padding: 14px 16px;
  transition: border-color 0.15s, background 0.15s, box-shadow 0.15s;
  cursor: pointer;
  min-height: 52px;
}
.mtk-test-root[data-test-theme="light"] .mtk-opt,
.mtk-test-root[data-test-theme="light"] .qx-prac-opt {
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.mtk-test-root[data-test-theme="light"] .mtk-opt:hover,
.mtk-test-root[data-test-theme="light"] .qx-prac-opt:hover:not(:disabled) {
  border-color: var(--primary);
  background: #F0FDFA;
}
.mtk-test-root[data-test-theme="light"] .mtk-opt.selected,
.mtk-test-root[data-test-theme="light"] .qx-prac-opt.selected {
  border-color: var(--primary) !important;
  background: #CCFBF1 !important;
  box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.2);
}
.mtk-q-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.mtk-q-num {
  font-family: var(--qx-font-display);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
}
.qx-qtype-badge,
.allen-prac-chapter {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
}
.qx-qtype-badge {
  background: var(--accent-light);
  color: var(--accent);
}
.allen-prac-chapter {
  background: #F1F5F9;
  color: var(--gray);
}
[data-theme="dark"] .allen-prac-chapter {
  background: #334155;
}

/* Palette states (NTA-like) */
.mtk-pal-cell,
.qx-pal-cell {
  border-radius: 8px;
  font-weight: 700;
}
.mtk-pal-cell.current,
.qx-pal-cell.current {
  border: 2px solid var(--primary) !important;
  box-shadow: 0 0 0 2px rgba(13, 148, 136, 0.25);
}

/* Solution CTA amber */
.qx-view-sol,
button[onclick*="Sol"],
.qx-sol-btn {
  border-color: #F59E0B !important;
  color: #B45309 !important;
}

/* Community soft card */
.community-box,
.qx-community-empty {
  background: var(--card);
  border: 1px dashed var(--border);
  border-radius: var(--radius-card);
  padding: 16px;
  color: var(--gray);
  font-size: 13px;
}

/* PYQ exam logo containers — uniform frame, logo art untouched */
.cpyqb-exam-tile-ic,
.exam-pill-ic,
.exam-card-ic {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: #F8FAFC;
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
}
[data-theme="dark"] .cpyqb-exam-tile-ic,
[data-theme="dark"] .exam-pill-ic {
  background: #0F172A;
}

/* Chapter letter badge → soft subject-tinted circle (icon slot) */
.ch-card .ch-ic,
.cpyqb-ch-ic-fb,
.ch-letter {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 14px;
  background: var(--accent-light);
  color: var(--accent);
  flex-shrink: 0;
}

/* REDUCED / REMOVED chips */
.tag-reduced, .chip-reduced {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--orange-light);
  color: #B45309;
  font-size: 11px;
  font-weight: 800;
}
.tag-removed, .chip-removed {
  display: inline-flex;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  background: var(--red-light);
  color: var(--red);
  font-size: 11px;
  font-weight: 800;
}

/* Sticky progress strip already present — tone down to brand */
.mtk-color-strip {
  height: 4px !important;
  opacity: 0.95;
}

/* Subscripts from chem fixer */
.qx-content sub,
.mtk-opt-text sub,
.mtk-q-text sub {
  font-size: 0.75em;
  vertical-align: sub;
  line-height: 0;
}