/**
 * Quantrex Academy — Master Premium UI/UX Layer
 * Visual only. 8px spacing system. Inter typography.
 * Does not change app logic or data.
 */

:root {
  /* Spacing (8px grid) */
  --qx-sp-1: 8px;
  --qx-sp-2: 16px;
  --qx-sp-3: 24px;
  --qx-sp-4: 32px;
  --qx-sp-5: 40px;
  --qx-gap-cards: 20px;
  --qx-pad-card: 24px;
  --qx-pad-section: 32px;
  --qx-pad-container: 40px;
  --qx-btn-py: 16px;
  --qx-btn-px: 24px;
  --qx-radius: 16px;
  --qx-radius-sm: 12px;
  --qx-radius-fig: 14px;
  --qx-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
  --qx-shadow-hover: 0 8px 28px rgba(15, 23, 42, 0.09);

  /* Typography */
  --qx-font-display: "Inter", "Poppins", "Segoe UI", system-ui, sans-serif;
  --qx-font-body: "Inter", "Poppins", "Segoe UI", system-ui, sans-serif;
  --qx-font-math: "STIX Two Math", "STIX Two Text", "Cambria Math", "Times New Roman", serif;
  --qx-fw-regular: 400;
  --qx-fw-medium: 500;
  --qx-fw-semibold: 600;
  --qx-fw-bold: 700;
  --qx-fs-caption: 12px;
  --qx-fs-sm: 14px;
  --qx-fs-body: 16px;
  --qx-fs-card: 18px;
  --qx-fs-section: 20px;
  --qx-fs-sub: 24px;
  --qx-fs-h1: 32px;
  --qx-lh: 1.6;

  /* Premium accents (not childish) */
  --qx-grad-blue: linear-gradient(135deg, #2563eb, #4f46e5);
  --qx-grad-cyan: linear-gradient(135deg, #0891b2, #0d9488);
  --qx-grad-violet: linear-gradient(135deg, #7c3aed, #6366f1);
  --qx-grad-amber: linear-gradient(135deg, #d97706, #ea580c);
  --qx-grad-rose: linear-gradient(135deg, #e11d48, #db2777);
  --qx-grad-emerald: linear-gradient(135deg, #059669, #0d9488);
  --qx-muted: #64748b;
  --qx-border-soft: rgba(148, 163, 184, 0.28);
}

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1;
}

body,
.main,
.content,
#app-main {
  font-family: var(--qx-font-body) !important;
  font-size: var(--qx-fs-body);
  font-weight: var(--qx-fw-regular);
  line-height: var(--qx-lh);
  letter-spacing: -0.011em;
}

/* ── Type scale ── */
h1, .page-head h1, .dash-greet-left h1, .qx-subject-hero h1, .cpyqb-exam-bank-head h1 {
  font-family: var(--qx-font-display) !important;
  font-size: var(--qx-fs-h1) !important;
  font-weight: var(--qx-fw-bold) !important;
  line-height: 1.25 !important;
  letter-spacing: -0.03em !important;
}

h2, .sec-title, .marks-tests-head h1, .cpyqb-marks-head h1 {
  font-family: var(--qx-font-display) !important;
  font-size: var(--qx-fs-sub) !important;
  font-weight: var(--qx-fw-bold) !important;
  letter-spacing: -0.025em !important;
}

h3, .cpyqb-exam-sec-title, .qx-all-topics-label, .ch-hub-panel h4 {
  font-family: var(--qx-font-display) !important;
  font-size: var(--qx-fs-section) !important;
  font-weight: var(--qx-fw-semibold) !important;
  letter-spacing: -0.02em !important;
}

.subj-card strong,
.ch-card strong,
.qx-topic-name,
.qx-folder-title,
.qx-module-body strong,
.book-card strong,
.exam-opt strong {
  font-family: var(--qx-font-display) !important;
  font-size: var(--qx-fs-card) !important;
  font-weight: var(--qx-fw-semibold) !important;
  letter-spacing: -0.02em !important;
}

p, .sec-desc, .page-head p, .q-text, small, .result-count, .empty {
  font-family: var(--qx-font-body) !important;
  line-height: var(--qx-lh) !important;
  overflow-wrap: anywhere;
  word-break: break-word;
  hyphens: auto;
}

.page-head p, .sec-desc, .qx-folder-sub, .subj-card small, .ch-card small {
  font-size: var(--qx-fs-sm) !important;
  color: var(--qx-muted, var(--gray));
  font-weight: var(--qx-fw-medium);
}

/* ── Buttons ── */
.btn-primary,
.btn-soft,
.mtk-btn,
.qx-top-exam,
.qx-diff-chip,
.qx-bm-btn,
.cpyqb-filter-main,
button.btn-primary {
  font-family: var(--qx-font-display) !important;
  font-weight: var(--qx-fw-semibold) !important;
  border-radius: var(--qx-radius-sm) !important;
  letter-spacing: -0.015em;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn-primary,
.mtk-btn-save,
.qx-prac-submit {
  padding: 12px var(--qx-btn-px) !important;
  min-height: 44px;
  box-shadow: var(--qx-shadow) !important;
}

.btn-primary:hover,
.btn-soft:hover,
.qx-top-exam:hover {
  transform: scale(1.02);
}

.btn-primary:active {
  transform: scale(0.99);
}

/* ── Cards / grids ── */
.subj-card,
.ch-card,
.qx-topic-card,
.qx-folder-card,
.qx-module-card,
.book-card,
.qx-book-card,
.q-card,
.cpyqb-exam-tile,
.dash-card,
.exam-opt,
.nb-q-card {
  border-radius: var(--qx-radius) !important;
  box-shadow: var(--qx-shadow) !important;
  border: 1px solid var(--qx-border-soft, var(--border)) !important;
  transition: transform 0.15s ease, box-shadow 0.15s ease !important;
}

.subj-card,
.ch-card,
.qx-topic-card.qx-topic-rich,
.cpyqb-exam-tile,
.qx-folder-card,
.qx-module-card {
  padding: var(--qx-pad-card) !important;
}

.subj-grid,
.ch-grid,
.qx-topic-grid,
.qx-folder-grid,
.qx-module-grid,
.cpyqb-exam-grid,
.q-list {
  gap: var(--qx-gap-cards) !important;
}

.subj-card:hover,
.ch-card:hover,
.qx-topic-card:hover,
.qx-folder-card:hover:not(.soon),
.qx-module-card:hover:not(.soon),
.cpyqb-exam-tile:hover:not(.soon),
.q-card:hover,
.book-card:hover:not(.soon) {
  transform: translateY(-2px) scale(1.01);
  box-shadow: var(--qx-shadow-hover) !important;
}

/* ── Content container ── */
.content,
#app-main {
  padding-left: max(16px, min(var(--qx-pad-container), 4vw));
  padding-right: max(16px, min(var(--qx-pad-container), 4vw));
}

.page-head {
  margin-bottom: var(--qx-pad-section) !important;
}

.page-head h1 {
  margin-bottom: 8px !important;
}

/* ── Question / options readability ── */
.mtk-q-text,
.qx-prac-q,
.qx-content.qx-q-text-only,
.qx-question-body,
.q-text {
  font-size: var(--qx-fs-body) !important;
  font-weight: var(--qx-fw-medium) !important;
  line-height: 1.65 !important;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.mtk-opt-text,
.qx-prac-opt-text,
.qa-opt,
#qaOpts .qx-content {
  font-size: 15px !important;
  line-height: 1.6 !important;
  overflow-wrap: anywhere;
}

.qa-opt,
.qx-prac-opt,
.mtk-opt {
  border-radius: var(--qx-radius-sm) !important;
  padding: 14px 16px !important;
  gap: 12px !important;
}

/* ── Figures (70% max, centered, soft) ── */
.qx-fig,
.qx-pool-fig-wrap,
.qx-diagram-slot,
.qx-question-body .qx-diagram-slot,
.mtk-main .qx-fig,
.mtk-main #qxDiagramSlot,
.qa-wrap .qx-diagram-slot {
  max-width: 70% !important;
  width: 70% !important;
  margin-left: auto !important;
  margin-right: auto !important;
  margin-top: 24px !important;
  margin-bottom: 24px !important;
  border-radius: var(--qx-radius-fig) !important;
  box-shadow: var(--qx-shadow) !important;
  overflow: hidden;
  background: #fff;
  text-align: center;
}

.qx-fig img,
.qx-pool-fig-wrap img,
.qx-diagram-slot img,
#qxDiagramSlot img,
.qx-fig-img,
img.qx-pool-fig {
  max-width: 100% !important;
  width: auto !important;
  height: auto !important;
  max-height: min(52vh, 420px) !important;
  object-fit: contain !important;
  display: block !important;
  margin: 0 auto !important;
  border-radius: calc(var(--qx-radius-fig) - 2px) !important;
  image-rendering: -webkit-optimize-contrast;
}

/* Option figures stay smaller, still centered */
.mtk-opt .qx-fig,
.qx-prac-opt .qx-fig,
.qx-opt-fig,
.qx-opt-pair-struct {
  max-width: min(100%, 360px) !important;
  width: auto !important;
  margin: 12px auto !important;
  box-shadow: none !important;
}

.qx-fig-caption,
.qx-diagram-caption,
figcaption {
  display: block;
  font-size: var(--qx-fs-sm) !important;
  font-weight: var(--qx-fw-medium);
  color: var(--qx-muted) !important;
  text-align: center !important;
  margin-top: 8px !important;
  letter-spacing: 0.01em;
}

/* ── Math (KaTeX + MathJax + STIX) ── */
.katex,
.katex *,
.MathJax,
mjx-container,
mjx-container *,
math,
mi, mo, mn, mtext, mrow, mfrac, msub, msup, msqrt {
  font-family: var(--qx-font-math) !important;
  -webkit-font-smoothing: antialiased;
}

.katex {
  font-size: 1.08em !important;
}

.katex-display {
  margin: 0.75em 0 !important;
  overflow-x: auto;
  text-align: left !important;
}

math {
  font-size: 1.06em;
}

/* Chemistry unicode helper class */
.qx-chem {
  font-family: var(--qx-font-body);
  font-feature-settings: "subs" 1, "sups" 1;
  letter-spacing: 0.01em;
}

/* ── Tables ── */
table,
.qx-table,
.sol-body table,
.mtk-q-text table,
.qx-content table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border-radius: var(--qx-radius-sm);
  overflow: hidden;
  border: 1px solid var(--qx-border-soft, var(--border));
  font-size: var(--qx-fs-sm);
  margin: var(--qx-sp-3) 0;
  display: block;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table thead th,
.qx-table thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  background: linear-gradient(180deg, #f8fafc, #f1f5f9);
  font-weight: var(--qx-fw-semibold);
  font-family: var(--qx-font-display) !important;
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

html[data-theme="dark"] table thead th {
  background: linear-gradient(180deg, #1e293b, #0f172a);
}

table tbody tr:nth-child(even) {
  background: rgba(148, 163, 184, 0.08);
}

table tbody tr:hover {
  background: rgba(99, 102, 241, 0.08);
}

table td, table th {
  padding: 10px 14px;
  border-bottom: 1px solid var(--qx-border-soft, var(--border));
  vertical-align: middle;
}

/* ── Premium gradients (subtle accents) ── */
.qx-topic-card::before,
.qx-folder-card::before {
  border-radius: var(--qx-radius) var(--qx-radius) 0 0;
}

.qx-subject-hero,
.dash-board-hero,
.qx-ch-hub-hero {
  border-radius: var(--qx-radius) !important;
  box-shadow: var(--qx-shadow) !important;
}

/* ── Progress soft ── */
.qx-prog-bar {
  height: 6px !important;
  border-radius: 999px !important;
  overflow: hidden;
  background: rgba(148, 163, 184, 0.2);
}

/* ── Stats chips on cards (visual polish for existing data) ── */
.qx-topic-details,
.q-meta {
  gap: 8px !important;
}

.qx-ch-pill,
.tag {
  border-radius: 999px !important;
  font-family: var(--qx-font-display) !important;
  font-weight: var(--qx-fw-semibold) !important;
  font-size: 11px !important;
  letter-spacing: 0.02em;
}

/* ── Top exam bar ── */
.qx-top-exam {
  border-radius: 999px !important;
  font-family: var(--qx-font-display) !important;
}

/* ── Skeleton / loading polish ── */
.qx-load-opts,
.qx-load-q,
.empty {
  border-radius: var(--qx-radius-sm);
  padding: var(--qx-sp-3) !important;
  line-height: var(--qx-lh);
}

/* ── Mobile ── */
@media (max-width: 720px) {
  :root {
    --qx-fs-h1: 26px;
    --qx-fs-sub: 20px;
    --qx-pad-card: 16px;
    --qx-pad-container: 16px;
    --qx-gap-cards: 12px;
  }

  .qx-fig,
  .qx-pool-fig-wrap,
  .qx-diagram-slot,
  .mtk-main .qx-fig,
  .mtk-main #qxDiagramSlot {
    max-width: 92% !important;
    width: 92% !important;
    margin-top: 16px !important;
    margin-bottom: 16px !important;
  }

  .content, #app-main {
    padding-left: 12px;
    padding-right: 12px;
  }
}

/* Accessibility focus */
button:focus-visible,
a:focus-visible,
.subj-card:focus-visible,
.qx-topic-card:focus-visible {
  outline: 2px solid #6366f1;
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}