/* ============================================================
   ExamReadyHub — Global Styles
   Design: Deep navy + teal accent, clean study-app aesthetic
   ============================================================ */

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

:root {
  --navy:        #1B3557;
  --navy-dark:   #122540;
  --teal:        #1CA9A0;
  --teal-hover:  #17928A;
  --teal-light:  #E6F7F6;
  --amber:       #F59E0B;
  --bg:          #F0F4F9;
  --card:        #FFFFFF;
  --text:        #1A2035;
  --text-muted:  #64748B;
  --border:      #DDE3ED;
  --success:     #059669;
  --success-bg:  #D1FAE5;
  --error:       #DC2626;
  --error-bg:    #FEE2E2;
  --radius:      10px;
  --radius-lg:   16px;
  --shadow-sm:   0 1px 4px rgba(27,53,87,0.08);
  --shadow:      0 3px 12px rgba(27,53,87,0.10);
  --shadow-lg:   0 8px 32px rgba(27,53,87,0.13);
  --transition:  180ms ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--teal); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--teal-hover); }
img { max-width: 100%; }

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Typography ----------------------------------------- */
h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--navy);
}
h1 { font-size: clamp(1.9rem, 4vw, 2.8rem); }
h2 { font-size: clamp(1.3rem, 2.5vw, 1.7rem); }
h3 { font-size: 1.15rem; }
h4 { font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-muted); }

/* --- Buttons -------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 24px;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), transform 80ms ease, box-shadow var(--transition);
  text-decoration: none;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--teal);
  color: #fff;
}
.btn-primary:hover { background: var(--teal-hover); color: #fff; box-shadow: 0 4px 14px rgba(28,169,160,0.35); }

.btn-outline {
  background: transparent;
  color: var(--navy);
  border-color: var(--border);
}
.btn-outline:hover { border-color: var(--teal); color: var(--teal); }

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 9px 18px;
}
.btn-ghost:hover { color: var(--navy); background: var(--bg); }

/* --- Header / Nav --------------------------------------- */
.site-header {
  background: var(--navy);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.03em;
  text-decoration: none;
}
.logo span { color: var(--teal); }
.logo:hover { color: #fff; }

.site-nav {
  display: flex;
  gap: 4px;
}
.site-nav a {
  color: rgba(255,255,255,0.78);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 7px 14px;
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
}
.site-nav a:hover { color: #fff; background: rgba(255,255,255,0.1); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 6px;
}

/* Mobile nav */
@media (max-width: 600px) {
  .nav-toggle { display: block; }
  .site-nav {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--navy-dark);
    flex-direction: column;
    padding: 12px 16px;
    gap: 2px;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px 16px; border-radius: 8px; }
}

/* --- Hero ----------------------------------------------- */
.hero {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 60%, #1a4a6e 100%);
  color: #fff;
  padding: 72px 0 80px;
  text-align: center;
}

.hero h1 {
  color: #fff;
  margin-bottom: 18px;
}
.hero h1 .accent { color: var(--teal); }

.hero-sub {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.75);
  max-width: 540px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* --- Category List -------------------------------------- */
.categories-section {
  padding: 60px 0 40px;
}

.category-block {
  margin-bottom: 52px;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
  padding-bottom: 14px;
  border-bottom: 2px solid var(--border);
}

.category-icon {
  width: 40px;
  height: 40px;
  background: var(--teal-light);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.category-header h2 { margin-bottom: 2px; }
.category-header .cat-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 16px;
}

/* --- Exam Card ------------------------------------------ */
.exam-card {
  background: var(--card);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
  text-decoration: none;
  color: inherit;
}
.exam-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--teal);
  transform: translateY(-2px);
  color: inherit;
}

.exam-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.exam-title {
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--navy);
  line-height: 1.35;
  flex: 1;
}

.exam-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 20px;
  background: var(--teal-light);
  color: var(--teal-hover);
  white-space: nowrap;
  margin-left: 10px;
  flex-shrink: 0;
}

.exam-desc {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.5;
  flex: 1;
}

.exam-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 4px;
}

.exam-q-count {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.exam-start-link {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--teal);
  display: flex;
  align-items: center;
  gap: 4px;
}
.exam-start-link::after { content: "→"; }

/* --- AdSense Placeholders ------------------------------- */
.adsense-placeholder {
  display: block;
  background: #f8f8f8;
  border: 1px dashed #ccc;
  border-radius: 8px;
  margin: 24px auto;
  max-width: 800px;
  min-height: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #aaa;
  font-size: 0.8rem;
  font-style: italic;
}
.adsense-placeholder::before { content: "[ Ad Unit ]"; }

/* --- Quiz Page ------------------------------------------ */
.quiz-page main { padding: 32px 0 60px; }

.breadcrumb {
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.breadcrumb a { color: var(--teal); }
.breadcrumb span { color: #aaa; }

/* Quiz container states */
#quiz-container { max-width: 680px; margin: 0 auto; }

/* Exam intro */
.exam-intro-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  text-align: center;
  box-shadow: var(--shadow);
}
.exam-intro-card h1 { font-size: 1.6rem; margin-bottom: 10px; }
.exam-intro-desc {
  color: var(--text-muted);
  margin-bottom: 8px;
  font-size: 0.95rem;
  line-height: 1.7;
}
.exam-meta-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--teal-light);
  color: var(--teal-hover);
  border-radius: 20px;
  padding: 6px 16px;
  font-size: 0.83rem;
  font-weight: 600;
  margin: 16px 0 28px;
}

/* Progress bar */
.quiz-progress-wrap {
  margin-bottom: 24px;
}
.quiz-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.83rem;
  color: var(--text-muted);
  margin-bottom: 8px;
  font-weight: 500;
}
.quiz-progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 99px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--teal), #1BC6BC);
  border-radius: 99px;
  transition: width 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Question card */
.question-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

.question-num {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--teal);
  margin-bottom: 12px;
}

.question-text {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--navy);
  line-height: 1.55;
  margin-bottom: 24px;
}

/* Answer options */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 0.93rem;
  color: var(--text);
  text-align: left;
  transition: border-color var(--transition), background var(--transition), color var(--transition);
  font-family: inherit;
  width: 100%;
  line-height: 1.5;
}
.option-btn:hover:not(:disabled) {
  border-color: var(--teal);
  background: var(--teal-light);
}
.option-btn:disabled { cursor: default; }

.option-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 28px;
  border-radius: 6px;
  background: #fff;
  border: 1.5px solid var(--border);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: all var(--transition);
}

/* Answer states */
.option-btn.correct {
  background: var(--success-bg);
  border-color: var(--success);
  color: var(--navy);
}
.option-btn.correct .option-letter {
  background: var(--success);
  border-color: var(--success);
  color: #fff;
}
.option-btn.wrong {
  background: var(--error-bg);
  border-color: var(--error);
  color: var(--navy);
}
.option-btn.wrong .option-letter {
  background: var(--error);
  border-color: var(--error);
  color: #fff;
}

/* Feedback / Explanation */
.feedback-box {
  margin-top: 20px;
  padding: 14px 18px;
  border-radius: var(--radius);
  border-left: 4px solid;
  font-size: 0.9rem;
  line-height: 1.6;
  animation: fadeUp 250ms ease;
}
.feedback-box.correct-fb {
  background: var(--success-bg);
  border-color: var(--success);
  color: #065F46;
}
.feedback-box.wrong-fb {
  background: var(--error-bg);
  border-color: var(--error);
  color: #7F1D1D;
}
.feedback-title {
  font-weight: 700;
  margin-bottom: 4px;
  display: flex;
  align-items: center;
  gap: 6px;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.quiz-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 20px;
}

/* Results screen */
.results-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow);
  text-align: center;
}

.score-ring {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  border: 6px solid var(--border);
  position: relative;
}
.score-ring.great { border-color: var(--success); background: var(--success-bg); }
.score-ring.ok    { border-color: var(--amber);   background: #FEF9E7; }
.score-ring.poor  { border-color: var(--error);   background: var(--error-bg); }

.score-pct {
  font-size: 2rem;
  font-weight: 800;
  color: var(--navy);
  line-height: 1;
}
.score-frac {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
}

.results-title { margin-bottom: 8px; }
.results-msg {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 28px;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 28px;
  text-align: left;
}
.results-table th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 8px 12px;
  border-bottom: 2px solid var(--border);
  font-weight: 600;
}
.results-table td {
  font-size: 0.87rem;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  line-height: 1.45;
}
.results-table tr:last-child td { border-bottom: none; }

.result-icon {
  font-size: 1.1rem;
  padding-right: 4px;
}

.results-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Static Pages (About / Contact) --------------------- */
.static-page main { padding: 52px 0 80px; }
.static-page .page-card {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 40px 48px;
  box-shadow: var(--shadow);
  max-width: 700px;
  margin: 0 auto;
}
.static-page h1 { margin-bottom: 20px; }
.static-page p { color: var(--text-muted); line-height: 1.75; margin-bottom: 16px; }
.static-page h2 { font-size: 1.15rem; margin: 28px 0 10px; }
.contact-form { display: flex; flex-direction: column; gap: 14px; margin-top: 20px; }
.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 0.93rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition);
}
.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--teal);
  background: #fff;
}
.contact-form textarea { min-height: 130px; resize: vertical; }

/* --- Footer --------------------------------------------- */
.site-footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.6);
  padding: 48px 0 28px;
  margin-top: 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 32px;
  margin-bottom: 36px;
}
.footer-brand .logo { font-size: 1.2rem; }
.footer-brand p { font-size: 0.85rem; margin-top: 10px; color: rgba(255,255,255,0.5); }
.footer-links h4 {
  color: rgba(255,255,255,0.85);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  text-transform: uppercase;
}
.footer-links a {
  display: block;
  color: rgba(255,255,255,0.5);
  font-size: 0.87rem;
  margin-bottom: 8px;
  transition: color var(--transition);
}
.footer-links a:hover { color: var(--teal); }
.footer-copy {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.3);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 20px;
  text-align: center;
}

/* --- Utilities ------------------------------------------ */
.sr-only {
  position: absolute; width: 1px; height: 1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap;
}
.hidden { display: none !important; }

/* --- Responsive ----------------------------------------- */
@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: span 2; }
  .question-card { padding: 22px 18px; }
  .results-card { padding: 24px 16px; }
  .static-page .page-card { padding: 28px 22px; }
  .exam-intro-card { padding: 28px 20px; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: span 1; }
  .hero { padding: 52px 0 60px; }
  .results-table th:last-child,
  .results-table td:last-child { display: none; }
}

/* --- Search Bar ----------------------------------------- */
.search-section {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  position: sticky;
  top: 64px;
  z-index: 40;
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
}

.search-wrap {
  position: relative;
  max-width: 580px;
  margin: 0 auto;
}

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1rem;
  pointer-events: none;
  opacity: .55;
  line-height: 1;
}

.search-wrap input[type="search"] {
  width: 100%;
  box-sizing: border-box;
  padding: 13px 44px 13px 46px;
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  -webkit-appearance: none;
}

.search-wrap input[type="search"]:focus {
  outline: none;
  border-color: var(--teal);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(28,169,160,.15);
}

/* hide browser's built-in clear button */
.search-wrap input[type="search"]::-webkit-search-cancel-button { display: none; }

.search-clear {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: var(--border);
  border: none;
  color: var(--text-muted);
  font-size: .78rem;
  cursor: pointer;
  padding: 3px 8px;
  border-radius: 20px;
  line-height: 1.5;
  transition: background var(--transition), color var(--transition);
}

.search-clear:hover { background: var(--navy); color: #fff; }

.search-status {
  text-align: center;
  font-size: .82rem;
  color: var(--teal);
  font-weight: 600;
  margin-top: 6px;
  min-height: 18px;
}

/* --- No Results ----------------------------------------- */
.no-results {
  text-align: center;
  padding: 60px 20px;
}

.no-results h3 {
  font-size: 1.15rem;
  color: var(--navy);
  margin-bottom: 8px;
}

.no-results p { color: var(--text-muted); font-size: .9rem; }

.no-results .btn-ghost {
  background: none;
  border: none;
  color: var(--teal);
  font-size: .9rem;
  cursor: pointer;
  padding: 0;
  font-family: inherit;
  text-decoration: underline;
}

/* --- Category Page -------------------------------------- */
.category-page-header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 32px;
  padding-bottom: 22px;
  border-bottom: 2px solid var(--border);
}

.category-page-icon {
  width: 60px;
  height: 60px;
  background: var(--teal-light);
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.85rem;
  flex-shrink: 0;
}

.category-page-title {
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  color: var(--navy);
  margin-bottom: 4px;
}

.category-page-count {
  font-size: .9rem;
  color: var(--text-muted);
}

/* Clickable category name on homepage */
.category-name-link {
  color: inherit;
  text-decoration: none;
}

.category-name-link:hover { color: var(--teal); }

/* "View all →" link in category header */
.view-all-link {
  margin-left: auto;
  font-size: .82rem;
  font-weight: 700;
  color: var(--teal);
  white-space: nowrap;
  letter-spacing: .01em;
}

.view-all-link:hover { text-decoration: underline; }

/* --- Search responsive ---------------------------------- */
@media (max-width: 600px) {
  .search-section { top: 58px; padding: 12px 0; }
  .search-wrap input[type="search"] { font-size: .93rem; padding: 11px 40px 11px 42px; }
}

/* --- Category page main --------------------------------- */
.category-page main { padding: 32px 0 64px; }