/* OASpecific — shared brand, components and responsive foundations.
   Page styles reference these tokens; red/green remain meaningful exam states. */
:root {
  color-scheme: light;
  --brand-navy: #071b28;
  --brand-navy-hover: #12364a;
  --brand-navy-rgb: 7, 27, 40;
  --brand-gold: #c7a05a;
  --brand-gold-rgb: 199, 160, 90;
  --brand-gold-ink: #806029;
  --brand-gold-soft: #f5eddb;
  --brand-gold-border: #ddcba9;
  --brand-ivory: #f8f7f3;
  --brand-surface: #ffffff;
  --brand-surface-muted: #f0f2ef;
  --brand-border: #e2e5df;
  --brand-text: #18303d;
  --brand-muted: #596a72;
  --brand-radius: 16px;
  --brand-control-radius: 8px;
  --brand-shadow: 0 6px 24px rgba(7, 27, 40, .045);
  --brand-font: 'Inter', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --brand-display: 'Playfair Display', Georgia, serif;
  --bs-primary: var(--brand-navy);
  --bs-primary-rgb: var(--brand-navy-rgb);
  --bs-warning-rgb: var(--brand-gold-rgb);
  --bs-info-rgb: var(--brand-navy-rgb);
  --bs-body-color: var(--brand-text);
  --bs-body-bg: var(--brand-ivory);
  --bs-body-font-family: var(--brand-font);
  --bs-link-color: var(--brand-navy);
  --bs-link-hover-color: var(--brand-gold-ink);
  --bs-border-color: var(--brand-border);
  --bs-border-radius: var(--brand-control-radius);
}

html { scroll-padding-top: 100px; }
body:is(.oas-site, .oas-workspace, .oas-admin, .oas-admin-login) {
  margin: 0;
  font-family: var(--brand-font);
  color: var(--brand-text);
  background-color: var(--brand-ivory);
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
}
body :is(button, input, select, textarea) { font-family: inherit; }
body :is(a, button, input, select, textarea, summary):focus-visible {
  outline: 3px solid var(--brand-gold);
  outline-offset: 4px;
}
body ::selection { background: var(--brand-gold-soft); color: var(--brand-navy); }
body :is(h1, .page-header h1, .checkout-header h1, .hero-title, .oas-section-title, .oas-final-content h2) {
  font-family: var(--brand-display);
  font-weight: 500;
  letter-spacing: -.035em;
  line-height: 1.18;
  text-wrap: balance;
}
body :is(.page-header h1, .checkout-header h1) { font-size: clamp(30px, 3.2vw, 44px); }
body :is(.oas-section-title, .oas-final-content h2) { font-size: clamp(29px, 3.3vw, 42px); }
body :is(.oas-section-intro, .oas-final-content p) { font-size: 15px; line-height: 1.8; }
body :is(.eyebrow, .checkout-eyebrow, .oas-kicker, .brand-eyebrow) {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
}

/* Same quiet frame across marketing, catalog and student pages. */
body :is(.premium-dashboard, .prelims-page, .checkout-page) { background: var(--brand-ivory); }
body :is(.oas-section, .oas-footer-main) { padding-block: clamp(48px, 6vw, 88px); }
body :is(.dashboard-card, .paper-card, .subject-card, .section-card, .checkout-card,
  .order-card, .summary-card, .login-card, .card) {
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-radius);
  box-shadow: var(--brand-shadow);
}
body :is(.dashboard-card, .paper-card, .subject-card, .section-card, .checkout-card) {
  background-color: var(--brand-surface);
}
body :is(.dashboard-hero, .full-program-card) { border-radius: var(--brand-radius); }
body .dashboard-hero { background: linear-gradient(120deg, var(--brand-navy), var(--brand-navy-hover)); box-shadow: none; }
body .hero-title { font-size: clamp(28px, 3vw, 38px); }
body .metric-card { background: var(--brand-ivory); color: var(--brand-navy); border: 1px solid var(--brand-border); border-top: 2px solid var(--brand-gold); border-radius: 12px; box-shadow: none; }
body .metric-card:hover { transform: none; box-shadow: var(--brand-shadow); }
body .metric-card::after { display: none; }
body .metric-card .metric-icon { color: var(--brand-gold-ink); background: var(--brand-gold-soft); }
body .metric-label { opacity: 1; color: var(--brand-muted); font-size: 12px; }
body :is(.analytics-stat-icon, .mains-stat-icon) { color: var(--brand-gold-ink) !important; background: var(--brand-gold-soft) !important; }
body :is(.section-heading p, .sidebar-user small, .header-user span) { color: var(--brand-muted); }
body .oas-social-hint { background: var(--brand-navy); color: #fff; border: 1px solid var(--brand-gold-border); box-shadow: var(--brand-shadow); }
body .oas-premium-home { background: var(--brand-ivory); }
body .oas-hero-new { background: radial-gradient(ellipse at 80% 30%, #173e4c 0%, transparent 55%), var(--brand-navy); }

/* Brand actions. Status/destructive buttons keep their distinct semantics. */
body :is(.oas-header-enroll, .oas-dark-btn, .payment-btn, .buy-btn, .paper-btn.open-btn,
  .premium-btn, .btn-admin, .oas-otp-submit) {
  background: var(--brand-navy);
  color: #fff;
  border: 1px solid var(--brand-navy);
  border-radius: var(--brand-control-radius);
  box-shadow: none;
  min-height: 44px;
  font-weight: 600;
  transition: background-color .18s, border-color .18s, box-shadow .18s;
}
body :is(.oas-header-enroll, .oas-dark-btn, .payment-btn, .buy-btn, .paper-btn.open-btn,
  .premium-btn, .btn-admin, .oas-otp-submit):hover {
  background: var(--brand-navy-hover);
  border-color: var(--brand-navy-hover);
  color: #fff;
}
body :is(.oas-btn-primary, .premium-btn-warning) {
  background: var(--brand-gold);
  color: var(--brand-navy);
  border: 1px solid var(--brand-gold);
  border-radius: var(--brand-control-radius);
}
body .oas-btn-primary:hover { background: #ddbc80; color: var(--brand-navy); }
body :is(.view-btn, .oas-header-login, .oas-light-btn, .btn-dashboard) {
  background: transparent;
  color: var(--brand-navy);
  border: 1px solid var(--brand-gold-border);
  border-radius: var(--brand-control-radius);
  min-height: 44px;
}
body :is(.view-btn, .oas-header-login, .oas-light-btn, .btn-dashboard):hover {
  color: var(--brand-navy);
  background: var(--brand-gold-soft);
  border-color: var(--brand-gold);
}
body .btn-primary {
  --bs-btn-bg: var(--brand-navy); --bs-btn-border-color: var(--brand-navy);
  --bs-btn-hover-bg: var(--brand-navy-hover); --bs-btn-hover-border-color: var(--brand-navy-hover);
  --bs-btn-active-bg: var(--brand-navy-hover); --bs-btn-active-border-color: var(--brand-navy-hover);
  --bs-btn-disabled-bg: #697b83; --bs-btn-disabled-border-color: #697b83;
  --bs-btn-focus-shadow-rgb: var(--brand-gold-rgb);
}
body .btn-outline-primary {
  --bs-btn-color: var(--brand-navy); --bs-btn-border-color: var(--brand-navy);
  --bs-btn-hover-bg: var(--brand-navy); --bs-btn-hover-border-color: var(--brand-navy);
  --bs-btn-active-bg: var(--brand-navy); --bs-btn-active-border-color: var(--brand-navy);
}
body .btn-info {
  --bs-btn-color: #fff; --bs-btn-bg: var(--brand-navy-hover); --bs-btn-border-color: var(--brand-navy-hover);
  --bs-btn-hover-color: #fff; --bs-btn-hover-bg: var(--brand-navy); --bs-btn-hover-border-color: var(--brand-navy);
}
body .btn-warning {
  --bs-btn-color: var(--brand-navy); --bs-btn-bg: var(--brand-gold-soft); --bs-btn-border-color: var(--brand-gold-border);
  --bs-btn-hover-color: var(--brand-navy); --bs-btn-hover-bg: var(--brand-gold); --bs-btn-hover-border-color: var(--brand-gold);
}
body .btn-logout { background: transparent; color: var(--brand-muted); border: 1px solid var(--brand-border); }
body .btn-logout:hover { background: var(--brand-surface-muted); color: var(--brand-navy); }
body .btn { border-radius: var(--brand-control-radius); font-weight: 600; }
body .btn:not(.btn-sm) { padding: .65rem 1.15rem; }
body :is(button, .btn):disabled { cursor: not-allowed; opacity: .55; transform: none; }

/* Inputs, results and tables share one visual language. */
body :is(.form-control, .form-select, .oas-otp-input) {
  border: 1px solid var(--brand-border);
  border-radius: var(--brand-control-radius);
  background-color: #fff;
  color: var(--brand-text);
  min-height: 44px;
}
body :is(.form-control, .form-select, .oas-otp-input):focus {
  border-color: var(--brand-gold);
  box-shadow: 0 0 0 3px rgba(var(--brand-gold-rgb), .16);
}
body input { accent-color: var(--brand-navy); }
body .form-check-input:checked { background-color: var(--brand-navy); border-color: var(--brand-navy); }
body .form-label { font-size: 13px; font-weight: 600; }
body .table { --bs-table-bg: #fff; --bs-table-color: var(--brand-text); --bs-table-border-color: var(--brand-border); }
body .table > thead { --bs-table-bg: var(--brand-surface-muted); font-size: 12px; letter-spacing: .025em; }
body .table > :not(caption) > * > * { padding: .9rem 1rem; }
body .nav-tabs { --bs-nav-tabs-link-active-color: var(--brand-navy); --bs-nav-tabs-link-active-border-color: var(--brand-gold) var(--brand-border) #fff; }
body .nav-tabs .nav-link { color: var(--brand-muted); }
body .nav-tabs .nav-link.active { border-top: 2px solid var(--brand-gold); color: var(--brand-navy); }
body .pagination { --bs-pagination-active-bg: var(--brand-navy); --bs-pagination-active-border-color: var(--brand-navy); --bs-pagination-color: var(--brand-navy); }

/* Shared public header and footer. */
body .oas-header { border-bottom-color: var(--brand-border); }
body .oas-main-inner { max-width: 1440px; margin-inline: auto; }
body .oas-nav-link { font-weight: 500; }
body :is(.oas-nav-link, .oas-mobile-link)[aria-current="page"] { color: var(--brand-gold-ink); }
body .oas-nav-link:focus-visible { border-radius: 4px; }
body .oas-footer { background: var(--brand-navy); }
body .oas-footer-top-line { height: 2px; background: var(--brand-gold); }
body .oas-otp-box { border: 1px solid var(--brand-gold-border); border-radius: 20px; max-height: calc(100dvh - 40px); overflow-y: auto; }
body .oas-otp-title { font-family: var(--brand-display); font-size: 28px; }
body .oas-otp-subtitle { color: var(--brand-muted); font-size: 14px; }
body .oas-mobile-panel { max-height: calc(100dvh - 100px); overflow-y: auto; }

/* Focused student/exam shell. */
body.oas-workspace { background: var(--brand-ivory) !important; }
.oas-workspace .app-navbar { border-top: 3px solid var(--brand-gold); box-shadow: none; }
.oas-workspace .navbar-brand img { height: 60px; }
.oas-workspace > .container-fluid { max-width: 1320px; margin-inline: auto; padding-top: 24px; padding-bottom: 56px; }
.oas-workspace :is(.question-card, .option-box) { border-color: var(--brand-border); }
.oas-workspace .question-card { box-shadow: var(--brand-shadow) !important; }
.oas-workspace .option-box { border-radius: 10px; transition: border-color .18s, background-color .18s; }
.oas-workspace .option-box:has(input:checked) { background: var(--brand-gold-soft); border-color: var(--brand-gold); }
.oas-workspace .option-card:has(input:checked) { background: var(--brand-gold-soft); border-color: var(--brand-gold) !important; }
.oas-workspace .palette-btn { border: 0; }
.oas-workspace .timer-badge { background: var(--brand-navy); color: #fff; border-radius: 8px; padding: 8px 14px; font-variant-numeric: tabular-nums; }

/* Administration retains compact, practical controls with the same branding. */
.oas-admin .sidebar {
  background: var(--brand-navy); width: 250px; height: 100dvh; overflow-y: auto;
  padding: 12px; border-right: 1px solid rgba(255,255,255,.08);
}
.oas-admin .sidebar > div:first-child { color: var(--brand-gold) !important; padding: 20px 12px 28px !important; letter-spacing: .02em; }
.oas-admin .sidebar a { border-radius: 8px; padding: 12px; margin-block: 4px; font-size: 13px; color: #c7d1d4; }
.oas-admin .sidebar a:hover { background: #12364a; color: #fff; }
.oas-admin .sidebar a.active { background: var(--brand-gold-soft); color: var(--brand-navy); font-weight: 600; }
.oas-admin .content { min-width: 0; }
.oas-admin .content > nav { min-height: 76px; border-bottom: 1px solid var(--brand-border); box-shadow: none !important; }
.oas-admin main > h2 { font-family: var(--brand-display); font-size: 32px; font-weight: 500; margin: 12px 0 28px; }
.oas-admin .card-header { background: var(--brand-surface-muted); border-bottom-color: var(--brand-border); }
.oas-admin-login { padding: 24px; background: radial-gradient(ellipse at 70% 20%, #234151, var(--brand-navy) 70%) !important; }
.oas-admin-login .login-card { max-width: 460px; overflow: hidden; border-top: 3px solid var(--brand-gold); }
.oas-admin-login .login-header { background: #fff; color: var(--brand-navy); padding: 40px 32px 8px; }
.oas-admin-login .brand-eyebrow { color: var(--brand-gold-ink); display: block; margin-bottom: 18px; }
.oas-admin-login .login-header h4 { font: 500 36px/1.2 var(--brand-display); margin-bottom: 12px; }
.oas-admin-login .login-header small { color: var(--brand-muted); }
.oas-admin-login .login-body { padding: 28px 32px 36px; }
.oas-admin-login .brand { color: var(--brand-muted); font-size: 12px; margin-top: 24px; }

.admin-editorial-panel { background: #fff; border: 1px solid var(--brand-border); border-radius: 16px; padding: clamp(20px, 3vw, 36px); }
.admin-editorial-panel > h2 { font: 500 32px/1.2 var(--brand-display); margin-bottom: 24px; }
.admin-editorial-panel > ul { padding-left: 0; list-style: none; }
.admin-editorial-panel > ul > li { padding: 18px 0; border-bottom: 1px solid var(--brand-border); }
.admin-editorial-panel a { color: var(--brand-gold-ink); font-weight: 600; }
.admin-editorial-panel :is(input:not([type="hidden"]):not([type="checkbox"]),select,textarea) { max-width: 100%; padding: 10px 12px; border: 1px solid var(--brand-border); border-radius: 8px; margin: 6px 8px 12px 0; }
.admin-editorial-panel button:not(.btn) { background: var(--brand-navy); color: white; border: 0; padding: 10px 18px; border-radius: 8px; }
.brand-archive { max-width: 1180px; margin: auto; padding: 72px 24px; }
.brand-archive-heading { max-width: 680px; margin-bottom: 40px; }
.brand-archive-heading .brand-eyebrow { color: var(--brand-gold-ink); }
.brand-archive-heading h1 { font-size: clamp(34px, 4vw, 52px); margin: 18px 0; }
.brand-archive-heading p { color: var(--brand-muted); margin-bottom: 24px; }
.brand-archive-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px),1fr)); gap: 20px; }
.brand-archive-card { display: block; padding: 28px; border: 1px solid var(--brand-border); border-radius: 16px; background: #fff; color: var(--brand-navy); text-decoration: none; }
.brand-archive-card h2 { font-size: 22px; margin: 16px 0; }
.brand-archive-card > span { color: var(--brand-gold-ink); font-weight: 600; }
.brand-archive-card p { color: var(--brand-muted); }
.brand-pagination { margin-top: 32px; }
@media (max-width: 1050px) {
  body.oas-site .oas-premium-home .oas-hero-inner { grid-template-columns: minmax(0, 1fr); }
  body.oas-site :is(.oas-hero-left, .oas-hero-right) { min-width: 0; }
  body.oas-site .oas-visual-panel { width: min(410px, 100%); }
}
@media (max-width: 650px) {
  body.oas-site .oas-premium-home .oas-container { width: calc(100% - 40px); }
  body.oas-site .oas-premium-home .oas-hero-new h1 { font-size: clamp(32px, 9vw, 42px); }
  body.oas-site .oas-hero-copy { overflow-wrap: break-word; }
  body.oas-site .oas-floating { display: none; }
  body.oas-site .oas-hero-notes { gap: 12px; flex-wrap: wrap; }
  body.oas-site .oas-visual-heading { right: 20px; }
  body.oas-site .oas-social-hint { display: none; }
}
@media (max-width: 767px) {
  body :is(.dashboard-hero, .full-program-card) { border-radius: 12px; padding: 24px 20px; }
  body :is(.checkout-header, .page-header) { gap: 20px; }
  body :is(.oas-btn-primary, .oas-btn-outline, .oas-dark-btn, .oas-light-btn) { min-height: 46px; }
  body .oas-main-inner { padding-inline: 20px; }
  .oas-workspace > .container-fluid { padding-top: 12px; }
  .oas-workspace .container-fluid.px-4 { padding-inline: 16px !important; }
  .oas-workspace .question-card .d-flex.justify-content-between { flex-wrap: wrap; gap: 10px; }
  .oas-workspace .card-body.p-5 { padding: 24px !important; }
  .oas-admin .sidebar.position-fixed { position: relative !important; width: 100%; height: auto; min-height: auto; display: flex; flex-wrap: wrap; gap: 4px; }
  .oas-admin .sidebar > div:first-child { flex-basis: 100%; padding: 12px !important; }
  .oas-admin .sidebar a { margin: 0; padding: 9px 12px; }
  .oas-admin .sidebar hr { display: none; }
  .oas-admin .content { margin-left: 0; }
  .oas-admin .content main { padding: 20px 16px !important; }
  .oas-admin .nav-tabs { flex-wrap: nowrap; overflow-x: auto; }
  .oas-admin .table-responsive { width: 100%; }
  .oas-admin-login .login-header { padding-inline: 24px; }
  .oas-admin-login .login-body { padding-inline: 24px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}