/* ══════════════════════════════════════════════════════════
   OET PLATFORM — GLOBAL DESIGN SYSTEM
   ══════════════════════════════════════════════════════════ */

:root {
  --navy: #0f172a;
  --navy-2: #1e293b;
  --teal: #0d9488;
  --teal-d: #0f766e;
  --teal-l: #ccfbf1;
  --accent: #0d9488;
  --accent-hover: #14b8a6;
  --accent-lt: #f0fdfa;
  --bg: #f8fafc;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text1: #0f172a;
  --text2: #475569;
  --text3: #94a3b8;
  --success: #10b981;
  --success-lt: #ecfdf5;
  --danger: #ef4444;
  --danger-lt: #fef2f2;
  --warning: #f59e0b;
  --warning-lt: #fffbeb;
  --font: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-m: 'DM Mono', monospace;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.08);
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text1);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* ── NAVBAR ── */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 32px;
  height: 64px;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--navy);
}

.nav-logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--teal), var(--teal-d));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: 16px;
}

.nav-logo-text {
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.3px;
}

.nav-logo-sub {
  font-size: 11px;
  color: var(--text3);
  font-weight: 600;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-profession {
  background: var(--accent-lt);
  color: var(--teal-d);
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ── BUTTONS ── */
.btn {
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  cursor: pointer;
  font-family: var(--font);
  font-size: 14px;
  padding: 10px 20px;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 2px 8px rgba(13,148,136,0.25);
}
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }

.btn-secondary {
  background: white;
  color: var(--text1);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.btn-sm { padding: 6px 14px; font-size: 12px; }
.btn-full { width: 100%; justify-content: center; }

/* ── CARDS ── */
.card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: all var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ── HUB SCREEN ── */
.hub { padding: 40px 32px 80px; max-width: 1000px; margin: 0 auto; }

.hub-hero {
  text-align: center;
  padding: 40px 0 32px;
}

.hub-hero h1 {
  font-size: 36px;
  font-weight: 800;
  color: var(--navy);
  letter-spacing: -1px;
  margin-bottom: 8px;
}

.hub-hero p {
  color: var(--text2);
  font-size: 16px;
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.hub-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  color: inherit;
  display: flex;
  align-items: center;
  gap: 16px;
}

.hub-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-md), 0 0 0 3px var(--accent-lt);
  transform: translateY(-2px);
}

.hub-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--accent-lt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.hub-card-text h3 {
  font-size: 16px;
  font-weight: 800;
  color: var(--navy);
  margin-bottom: 4px;
}

.hub-card-text p {
  font-size: 13px;
  color: var(--text3);
}

/* ── SECTION SCREENS ── */
.screen {
  display: none;
  position: fixed;
  inset: 0;
  background: white;
  z-index: 200;
  flex-direction: column;
  animation: slideUp 0.3s ease;
}

.screen.active { display: flex; }

@keyframes slideUp {
  from { transform: translateY(16px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.screen-nav {
  height: 56px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  flex-shrink: 0;
}

.screen-nav-back {
  cursor: pointer;
  font-weight: 700;
  color: var(--text2);
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  font-family: var(--font);
}
.screen-nav-back:hover { color: var(--accent); }

.screen-nav-tag {
  background: var(--accent-lt);
  color: var(--teal-d);
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
}

.screen-body {
  flex: 1;
  overflow-y: auto;
  background: var(--bg);
}

/* ── TEST INTERFACE ── */
.test-topbar {
  height: 56px;
  background: white;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
}

.test-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.test-label {
  font-weight: 800;
  color: var(--accent);
  font-size: 16px;
}

.test-counter {
  font-size: 13px;
  font-weight: 700;
  color: var(--text3);
}

.test-timer {
  font-family: var(--font-m);
  font-weight: 700;
  color: var(--accent);
  font-size: 15px;
}

.test-timer.warning { color: var(--danger); }

/* ── QUESTION AREA ── */
.q-area {
  max-width: 800px;
  margin: 0 auto;
  padding: 32px 24px;
}

.q-type {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  margin-bottom: 8px;
}

.q-stem {
  font-size: 17px;
  font-weight: 700;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 20px;
}

.q-instruction {
  font-size: 14px;
  color: var(--text2);
  line-height: 1.6;
  padding: 14px 18px;
  background: var(--accent-lt);
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
  margin-bottom: 24px;
}

/* ── MCQ OPTIONS ── */
.mcq-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 10px;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 15px;
  line-height: 1.5;
}

.mcq-option:hover {
  border-color: var(--accent);
  background: var(--accent-lt);
}

.mcq-option.selected {
  border-color: var(--accent);
  background: var(--accent-lt);
}

.mcq-option.correct {
  border-color: var(--success);
  background: var(--success-lt);
}

.mcq-option.wrong {
  border-color: var(--danger);
  background: var(--danger-lt);
}

.mcq-dot {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
  transition: all var(--transition);
}

.mcq-option.selected .mcq-dot {
  border-color: var(--accent);
  background: radial-gradient(var(--accent) 40%, transparent 50%);
}

/* ── FILL-IN-BLANK ── */
.fib-input {
  border: none;
  border-bottom: 2px solid var(--accent);
  background: var(--accent-lt);
  padding: 4px 8px;
  font-size: 15px;
  font-family: var(--font);
  width: 140px;
  outline: none;
  margin: 0 4px;
  border-radius: 4px 4px 0 0;
  font-weight: 600;
  transition: all var(--transition);
}

.fib-input:focus {
  background: white;
  box-shadow: 0 4px 12px rgba(13,148,136,0.15);
}

.fib-input.correct { border-color: var(--success); background: var(--success-lt); }
.fib-input.wrong { border-color: var(--danger); background: var(--danger-lt); }

/* ── CLINICAL NOTES ── */
.clinical-notes {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  font-size: 14px;
  line-height: 2;
}

.notes-header {
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-lt);
}

.notes-section {
  margin-bottom: 16px;
}

.notes-label {
  font-weight: 700;
  color: var(--navy);
  font-size: 13px;
}

/* ── AUDIO PLAYER ── */
.audio-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
}

.audio-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  border: none;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.audio-progress {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
  cursor: pointer;
}

.audio-progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 0.1s linear;
}

/* ── SPLIT LAYOUT (Reading) ── */
.split {
  display: flex;
  height: 100%;
}

.split-left {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
  background: white;
  border-right: 1px solid var(--border);
}

.split-right {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
}

/* ── WRITING AREA ── */
.writing-area textarea {
  width: 100%;
  min-height: 300px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.7;
  resize: vertical;
  outline: none;
}

.writing-area textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-lt);
}

/* ── ROLE-PLAY CARDS ── */
.roleplay-card {
  background: white;
  border: 2px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 600px;
  margin: 0 auto;
}

.roleplay-card.candidate { border-color: var(--accent); }
.roleplay-card.interlocutor { border-color: var(--warning); }

.roleplay-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 16px;
}

.roleplay-card.candidate .roleplay-badge { background: var(--accent-lt); color: var(--teal-d); }
.roleplay-card.interlocutor .roleplay-badge { background: var(--warning-lt); color: #92400e; }

.roleplay-task {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--bg);
  border-radius: var(--radius);
  font-size: 14px;
  line-height: 1.6;
}

.roleplay-task li {
  margin-bottom: 6px;
  padding-right: 8px;
}

/* ── FEEDBACK / RESULTS ── */
.result-banner {
  padding: 14px 20px;
  border-radius: var(--radius);
  margin: 12px 0;
  font-weight: 700;
  font-size: 14px;
}

.result-banner.correct { background: var(--success-lt); color: #065f46; border: 1px solid var(--success); }
.result-banner.wrong { background: var(--danger-lt); color: #991b1b; border: 1px solid var(--danger); }

/* ── TOAST ── */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: var(--navy);
  color: white;
  padding: 12px 20px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  pointer-events: auto;
  animation: toastIn 0.3s ease, toastOut 0.3s ease 3.2s forwards;
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: 360px;
}

.toast-success { background: var(--success); }
.toast-warning { background: var(--warning); color: #1a1a1a; }
.toast-error { background: var(--danger); }
.toast-info { background: var(--accent); }

@keyframes toastIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }
@keyframes toastOut { from { opacity: 1; } to { transform: translateX(100%); opacity: 0; } }

/* ── MODALS ── */
.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,23,42,0.5);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  align-items: center;
  justify-content: center;
}

.overlay.open { display: flex; }

.modal {
  background: white;
  width: 440px;
  max-width: 95%;
  padding: 36px;
  border-radius: var(--radius-lg);
  text-align: center;
  box-shadow: 0 24px 80px rgba(0,0,0,0.15);
  animation: modalIn 0.3s ease;
}

@keyframes modalIn { from { transform: scale(0.96) translateY(8px); opacity: 0; } to { transform: scale(1) translateY(0); opacity: 1; } }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .navbar { padding: 0 16px; height: 56px; }
  .hub { padding: 24px 16px 60px; }
  .hub-hero h1 { font-size: 28px; }
  .hub-grid { grid-template-columns: 1fr; }
  .split { flex-direction: column; }
  .split-left { border-right: none; border-bottom: 1px solid var(--border); }
  .q-area { padding: 24px 16px; }
  .screen-nav { padding: 0 16px; }
  .toast-container { top: auto; bottom: 16px; right: 12px; left: 12px; }
  .toast { max-width: 100%; }
}

@media (max-width: 480px) {
  .hub-hero h1 { font-size: 24px; }
  .btn { padding: 10px 16px; font-size: 13px; }
  .mcq-option { padding: 12px; font-size: 14px; }
}