/* ==========================================================================
   IELTS Exam Platform — shared styles
   ========================================================================== */

:root {
  --ink: #1c2733;
  --ink-soft: #4a5568;
  --paper: #ffffff;
  --canvas: #eef1f5;
  --line: #d7dce3;
  --navy: #16233a;
  --navy-soft: #223655;
  --accent: #2f6fed;
  --accent-soft: #e8f0fe;
  --good: #1f8a4c;
  --bad: #c0392b;
  --highlight: #ffe27a;
  --radius: 6px;
  --font-body: "Georgia", "Iowan Old Style", "Times New Roman", serif;
  --font-ui: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

/* ---------- Landing page ---------- */

.landing {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  text-align: center;
}

.landing__eyebrow {
  font-size: 13px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
}

.landing h1 {
  font-family: var(--font-body);
  font-size: clamp(28px, 5vw, 44px);
  margin: 0 0 40px;
}

.landing__cards {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.exam-card {
  width: 260px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 36px 24px;
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  box-shadow: 0 1px 2px rgba(20, 30, 50, 0.05);
}

.exam-card:hover, .exam-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 24px rgba(20, 30, 50, 0.12);
  outline: none;
}

.exam-card__icon { font-size: 44px; display: block; margin-bottom: 16px; }
.exam-card__title { font-size: 20px; font-weight: 700; margin: 0 0 6px; }
.exam-card__desc { font-size: 14px; color: var(--ink-soft); margin: 0; }

/* ---------- Exam chrome (top bar) ---------- */

.exam-topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--navy);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  font-size: 14px;
}

.exam-topbar__left { display: flex; align-items: center; gap: 14px; font-weight: 600; }
.exam-topbar__badge {
  background: var(--navy-soft);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.04em;
}
.exam-topbar__right { display: flex; align-items: center; gap: 18px; }
.exam-topbar__timer { font-variant-numeric: tabular-nums; font-weight: 700; }
.exam-topbar__candidate { color: #c7d2e6; font-size: 13px; }

.focus-toggle {
  background: var(--navy-soft);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 6px;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
}
.focus-toggle:hover { background: #2c4368; }
.focus-toggle.active { background: var(--accent); border-color: var(--accent); }

/* Part quick-nav strip under the top bar */
.part-strip {
  position: sticky;
  top: 45px;
  z-index: 39;
  background: #fff;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 4px;
  padding: 0 20px;
  overflow-x: auto;
}
.part-strip__item {
  border: none;
  background: transparent;
  padding: 12px 16px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-soft);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  white-space: nowrap;
}
.part-strip__item:hover { color: var(--ink); }
.part-strip__item.current { color: var(--accent); border-bottom-color: var(--accent); }

body.focus-mode .part-strip,
body.focus-mode .highlight-hint { display: none; }
body.focus-mode .exam-shell { padding-top: 24px; }

/* ---------- Exam body layout ---------- */

.exam-shell {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px 120px;
}

.exam-shell--split {
  max-width: none;
  padding: 16px 12px 90px;
}

.highlight-hint--split {
  max-width: none;
  margin: 10px 12px 0;
}

.exam-part {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 28px 32px;
  margin-bottom: 28px;
}

.exam-part__heading {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 4px;
}

.exam-part__heading h2 {
  font-family: var(--font-body);
  margin: 0;
  font-size: 22px;
}

.exam-part__range { color: var(--ink-soft); font-size: 14px; }

.part-question-count {
  margin-left: auto;
  font-size: 12px;
  color: var(--ink-soft);
  background: var(--canvas);
  border-radius: 999px;
  padding: 3px 10px;
}

.exam-instructions {
  font-style: italic;
  color: var(--ink-soft);
  margin: 6px 0 20px;
  line-height: 1.5;
}

.exam-instructions strong { font-style: normal; }

.passage-title {
  font-family: var(--font-body);
  font-size: 24px;
  margin: 0 0 14px;
  text-align: center;
}

.passage-text p {
  line-height: 1.75;
  margin: 0 0 16px;
  font-family: var(--font-body);
  font-size: 16px;
}

.note-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px;
  background: #fafbfc;
  margin: 16px 0;
}

.note-box h3 { margin: 14px 0 8px; font-size: 16px; }
.note-box h3:first-child { margin-top: 0; }
.note-box ul { margin: 0 0 10px; padding-left: 22px; }
.note-box ul ul { margin-top: 4px; }
.note-box li { margin-bottom: 8px; line-height: 1.7; }

.q-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 22px;
  height: 22px;
  padding: 0 4px;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 12px;
  margin-right: 6px;
  font-family: var(--font-ui);
}

.blank-input {
  border: none;
  border-bottom: 1.5px solid var(--ink);
  background: transparent;
  font-family: var(--font-ui);
  font-size: 14px;
  padding: 2px 4px;
  min-width: 140px;
  margin: 0 2px;
}
.blank-input:focus {
  outline: none;
  border-bottom-color: var(--accent);
  background: var(--accent-soft);
}

.question-block { margin: 0 0 22px; }
.question-block:last-child { margin-bottom: 0; }
.question-block__prompt { font-weight: 600; margin-bottom: 10px; line-height: 1.5; }

.mcq-options { display: flex; flex-direction: column; gap: 8px; padding-left: 4px; }
.mcq-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: 4px;
}
.mcq-option:hover { background: var(--accent-soft); }
.mcq-option input { margin-top: 3px; }
.mcq-option.is-disabled { opacity: 0.45; cursor: not-allowed; }
.mcq-option.is-disabled:hover { background: transparent; }

.select-limit-note {
  font-size: 12px;
  color: var(--ink-soft);
  margin: -2px 0 8px 4px;
}
.select-limit-warning {
  font-size: 13px;
  color: var(--bad);
  background: #fdeceb;
  border: 1px solid #f3c2bd;
  border-radius: 6px;
  padding: 6px 10px;
  margin: 6px 0 4px 4px;
  display: none;
}
.select-limit-warning.visible { display: inline-block; }

.matching-row {
  display: grid;
  grid-template-columns: 1fr 160px;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--line);
}
.matching-row:last-child { border-bottom: none; }

select.blank-select {
  width: 100%;
  padding: 6px 8px;
  border-radius: 4px;
  border: 1px solid var(--line);
  font-family: var(--font-ui);
  font-size: 14px;
  background: #fff;
}
select.blank-select:focus { outline: 2px solid var(--accent); border-color: var(--accent); }

.options-reference {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 18px;
  background: #fafbfc;
  margin: 14px 0 20px;
}
.options-reference div { padding: 3px 0; font-size: 14px; }
.options-reference strong { display: inline-block; width: 22px; }

/* ---------- Candidate info modal ---------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 22, 35, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 16px;
}

.modal-card {
  background: #fff;
  border-radius: 10px;
  width: 100%;
  max-width: 420px;
  padding: 32px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.25);
}
.modal-card h2 { font-family: var(--font-body); margin: 0 0 6px; font-size: 22px; }
.modal-card p { color: var(--ink-soft); font-size: 14px; margin: 0 0 22px; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.field input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 15px;
  font-family: var(--font-ui);
}
.field input[type="text"]:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.field-error { color: var(--bad); font-size: 12px; margin-top: 4px; display: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: 6px;
  padding: 11px 22px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font-ui);
  transition: background 0.15s ease, transform 0.1s ease;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: #fff; width: 100%; }
.btn-primary:hover { background: #2559c4; }
.btn-primary:disabled { background: #9db3e0; cursor: not-allowed; }

.btn-secondary { background: var(--canvas); color: var(--ink); }
.btn-secondary:hover { background: #dfe3e9; }

.btn-danger { background: var(--bad); color: #fff; }
.btn-danger:hover { background: #a53225; }

.modal-card__actions {
  display: flex;
  gap: 10px;
}
.modal-card__actions .btn { flex: 1; width: auto; }

/* ---------- Fullscreen exit warning ---------- */

.fs-warning-bar {
  position: fixed;
  left: 50%;
  bottom: 90px;
  transform: translateX(-50%);
  z-index: 150;
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--navy);
  color: #fff;
  padding: 10px 16px;
  border-radius: 8px;
  font-size: 13px;
  box-shadow: 0 12px 30px rgba(0,0,0,0.3);
  max-width: calc(100vw - 32px);
}
.fs-warning-bar .btn { width: auto; padding: 7px 14px; font-size: 13px; white-space: nowrap; }

/* ---------- Time's up / auto-submit banner ---------- */

.time-up-banner {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 250;
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bad);
  color: #fff;
  padding: 12px 20px;
  border-radius: 10px;
  font-size: 14px;
  box-shadow: 0 16px 36px rgba(0,0,0,0.35);
  max-width: calc(100vw - 32px);
  animation: time-up-pulse 1s ease-in-out infinite;
}
.time-up-banner strong { font-weight: 800; }
#ielts-grace-seconds { font-weight: 800; font-variant-numeric: tabular-nums; }

@keyframes time-up-pulse {
  0%, 100% { box-shadow: 0 16px 36px rgba(0,0,0,0.35); }
  50% { box-shadow: 0 16px 36px rgba(192,57,43,0.55); }
}

/* ---------- Bottom question navigator ---------- */

.exam-navbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--paper);
  border-top: 1px solid var(--line);
  padding: 10px 16px;
  z-index: 40;
  box-shadow: 0 -4px 16px rgba(0,0,0,0.06);
}

.exam-navbar__row {
  display: flex;
  align-items: center;
  gap: 14px;
  max-width: 1100px;
  margin: 0 auto;
}

.exam-navbar__groups {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  padding: 4px 2px;
  flex: 1;
  scrollbar-width: thin;
}

.nav-group { display: flex; align-items: center; gap: 6px; flex: 0 0 auto; }
.nav-group__label {
  font-size: 11px;
  font-weight: 700;
  color: var(--ink-soft);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-right: 4px;
  white-space: nowrap;
}

.nav-pill {
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  color: var(--ink-soft);
}
.nav-pill.answered { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.nav-pill:hover { border-color: var(--accent); }

.btn-submit {
  background: var(--good);
  color: #fff;
  flex: 0 0 auto;
  white-space: nowrap;
}
.btn-submit:hover { background: #166b3b; }

/* ---------- Text highlighting ---------- */

mark.hl {
  background: var(--highlight);
  padding: 0 1px;
  border-radius: 2px;
  cursor: pointer;
}
mark.hl:hover { outline: 1px solid #c9a400; }

.highlight-hint {
  font-size: 12px;
  color: var(--ink-soft);
  background: #fff8dd;
  border: 1px solid #f0e0a0;
  border-radius: 6px;
  padding: 8px 12px;
  margin-bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ---------- Submission overlay ---------- */

.status-toast {
  position: fixed;
  top: 20px;
  right: 20px;
  background: var(--navy);
  color: #fff;
  padding: 14px 20px;
  border-radius: 8px;
  font-size: 14px;
  max-width: 320px;
  z-index: 200;
  box-shadow: 0 12px 30px rgba(0,0,0,0.25);
}
.status-toast.error { background: var(--bad); }
.status-toast.success { background: var(--good); }

/* ---------- Split-pane reading interface ---------- */

.reading-panel { display: none; }
.reading-panel.active { display: block; }

.reading-panel__header {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius) var(--radius) 0 0;
  padding: 10px 20px;
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-size: 14px;
}
.reading-panel__header strong { font-size: 15px; }
.reading-panel__header span { color: var(--ink-soft); }

.split-view {
  --split-ratio: 46%;
  display: flex;
  align-items: stretch;
  height: calc(100vh - var(--chrome-height, 230px));
  min-height: 420px;
  border: 1px solid var(--line);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  background: #fff;
  overflow: hidden;
}

.split-pane {
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.split-pane--passage {
  flex: 0 0 var(--split-ratio);
  padding: 26px 30px;
  background: #fff;
}

.split-pane--questions {
  flex: 1 1 auto;
  padding: 22px 26px;
  background: #fbfbfc;
  border-left: none;
}

.split-resizer {
  flex: 0 0 14px;
  cursor: col-resize;
  position: relative;
  background: var(--canvas);
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
}
.split-resizer::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 50%;
  width: 1px;
  background: var(--line);
  transform: translateX(-50%);
}
.split-resizer::after {
  content: "↔";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 22px;
  height: 22px;
  border-radius: 4px;
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.split-resizer:hover,
.split-resizer.dragging { background: var(--accent-soft); }
.split-resizer:hover::after,
.split-resizer.dragging::after { border-color: var(--accent); color: var(--accent); }

.split-view.no-resize .split-resizer { display: none; }

.question-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 22px 20px;
  margin-bottom: 16px;
}
.question-card:last-child { margin-bottom: 0; }
.question-card__head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.question-card__head h4 {
  margin: 0;
  font-size: 16px;
  font-family: var(--font-body);
}
.question-card .exam-instructions:first-of-type { margin-top: 0; }

body.resizing-split { cursor: col-resize; user-select: none; }
body.resizing-split .split-pane { pointer-events: none; }

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .split-view {
    flex-direction: column;
    height: auto;
    min-height: 0;
  }
  .split-pane--passage,
  .split-pane--questions {
    flex: none !important;
    max-height: 60vh;
  }
  .split-resizer { display: none; }
  .reading-panel__header { flex-wrap: wrap; }
}

@media (max-width: 720px) {
  .exam-part { padding: 20px 16px 24px; }
  .matching-row { grid-template-columns: 1fr; gap: 6px; }
  .exam-topbar__candidate { display: none; }
  .modal-card { padding: 24px; }
  .part-strip { top: 41px; }
  .exam-navbar__groups { gap: 12px; }
  .nav-group__label { display: none; }
}