:root {
  --font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  --bg: #0b0f17;
  --surface: #121824;
  --surface-hover: #182234;
  --border: rgba(255, 255, 255, 0.08);
  --border-focus: #38bdf8;

  --text: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent: #10b981;
  --accent-bg: rgba(16, 185, 129, 0.1);
  --accent-border: #059669;

  --max-w: 680px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.55;
  font-size: 16px;
  padding-bottom: 60px;
  -webkit-font-smoothing: antialiased;
}

/* Auth Protection Overlay */
.auth-screen {
  position: fixed;
  inset: 0;
  background: rgba(11, 15, 23, 0.96);
  backdrop-filter: blur(8px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.auth-screen[hidden] {
  display: none;
}

.auth-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  max-width: 360px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.auth-title {
  font-size: 1.15rem;
  font-weight: 700;
}

.auth-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.auth-row {
  display: flex;
  gap: 8px;
}

.auth-error {
  font-size: 0.8rem;
  color: #ef4444;
}

/* Header */
.app-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-title {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.btn-text {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
}

.btn-text:hover {
  color: var(--text);
}

/* Container */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Input Section */
.section-input {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.settings-box {
  padding-bottom: 12px;
  margin-bottom: 4px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.input-row {
  display: flex;
  gap: 8px;
}

.input-field {
  flex: 1;
  min-width: 0;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 10px 14px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
}

.input-field:focus {
  border-color: var(--border-focus);
}

.btn {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0 16px;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn.primary {
  background: var(--accent);
  color: #041f17;
}

.btn.primary:hover {
  opacity: 0.92;
}

.btn.secondary {
  background: var(--surface-hover);
  color: var(--text);
  border: 1px solid var(--border);
}

.status-notice {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--border-focus);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border-focus);
  animation: pulse 1.2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.4; }
  50% { opacity: 1; }
}

/* Search */
.section-search {
  position: sticky;
  top: 53px;
  z-index: 40;
  background: var(--bg);
  padding: 4px 0;
}

.input-search {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  padding: 10px 14px;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  outline: none;
}

.input-search:focus {
  border-color: rgba(255, 255, 255, 0.2);
}

/* Results Header */
.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2px;
}

.exam-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
}

/* Questions List */
.questions-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.question-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.question-header {
  display: flex;
  align-items: center;
  gap: 8px;
}

.q-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
}

.q-type {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.q-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.45;
}

/* Compact Choices */
.compact-choices {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 6px 0;
}

.compact-choice-item {
  font-size: 0.82rem;
  color: var(--text-muted);
  display: flex;
  align-items: baseline;
  gap: 6px;
  line-height: 1.35;
}

.compact-choice-item .dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--text-dim);
  flex-shrink: 0;
  transform: translateY(-2px);
}

/* Answer block: Focused & Bold */
.answer-block {
  background: var(--accent-bg);
  border: 1px solid var(--accent-border);
  border-radius: 6px;
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.answer-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.answer-text {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.35;
}

.q-explanation {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.4;
  border-top: 1px dashed rgba(16, 185, 129, 0.2);
  padding-top: 6px;
  margin-top: 2px;
}

mark {
  background: #f59e0b;
  color: #000;
  padding: 0 2px;
  border-radius: 2px;
}