/* ==========================================
   interview.css — Interview prep page
   ========================================== */

.iv-wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.iv-hero {
  background: linear-gradient(135deg, var(--bg-2), var(--bg-3));
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 16px;
  padding: 40px 36px;
  margin-bottom: 40px;
}

.iv-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 44px);
  margin: 0 0 12px;
  color: var(--ink);
}

.iv-hero .lead {
  font-size: 17px;
  color: var(--ink-2);
  line-height: 1.7;
  max-width: 720px;
  margin: 0;
}

.iv-section {
  margin-bottom: 50px;
}

.iv-section h2 {
  font-family: var(--font-display);
  font-size: 28px;
  color: var(--ink);
  margin: 0 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

.iv-tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.iv-tip {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 24px;
}

.iv-tip h3 {
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--ink);
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.iv-tip p {
  margin: 0;
  color: var(--ink-2);
  font-size: 15px;
  line-height: 1.65;
}

.iv-steps {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}

.iv-steps li {
  counter-increment: step;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px 18px 60px;
  margin-bottom: 12px;
  position: relative;
}

.iv-steps li::before {
  content: counter(step);
  position: absolute;
  left: 18px;
  top: 16px;
  width: 30px;
  height: 30px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  font-family: var(--font-display);
}

.iv-steps li strong {
  display: block;
  color: var(--ink);
  font-size: 16px;
  margin-bottom: 4px;
}

.iv-steps li span {
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.6;
}

.iv-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.iv-filter button {
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--ink-2);
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 14px;
  cursor: pointer;
  font-family: var(--font-body);
  transition: all 0.2s;
}

.iv-filter button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.iv-q-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.iv-q {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.iv-q.expanded {
  border-color: var(--accent);
}

.iv-q-head {
  padding: 18px 22px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
  user-select: none;
}

.iv-q-head:hover {
  background: var(--bg-3);
}

.iv-q-num {
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 6px;
  flex-shrink: 0;
  font-family: var(--font-display);
}

.iv-q-text {
  flex: 1;
  font-size: 16px;
  color: var(--ink);
  font-weight: 500;
  line-height: 1.5;
}

.iv-q-meta {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.iv-q-meta .tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--bg-3);
  color: var(--ink-2);
}

.iv-q-meta .diff-easy { background: #dcfce7; color: #166534; }
.iv-q-meta .diff-medium { background: #fef3c7; color: #92400e; }
.iv-q-meta .diff-hard { background: #fee2e2; color: #991b1b; }

[data-theme="dark"] .iv-q-meta .diff-easy { background: rgba(34,197,94,0.18); color: #4ade80; }
[data-theme="dark"] .iv-q-meta .diff-medium { background: rgba(234,179,8,0.18); color: #facc15; }
[data-theme="dark"] .iv-q-meta .diff-hard { background: rgba(239,68,68,0.18); color: #f87171; }

.iv-q-arrow {
  color: var(--ink-2);
  font-size: 14px;
  transition: transform 0.2s;
  flex-shrink: 0;
}

.iv-q.expanded .iv-q-arrow {
  transform: rotate(180deg);
}

.iv-q-body {
  display: none;
  padding: 0 22px 22px 22px;
  border-top: 1px solid var(--border);
  margin-top: 8px;
  padding-top: 16px;
  background: var(--bg);
}

.iv-q.expanded .iv-q-body {
  display: block;
}

.iv-q-body p {
  margin: 0;
  color: var(--ink);
  line-height: 1.8;
  font-size: 15px;
}

.iv-q-actions {
  display: flex;
  gap: 8px;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--border);
}

.iv-q-actions button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--ink-2);
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
  font-family: var(--font-body);
}

.iv-q-actions button:hover {
  background: var(--bg-2);
  color: var(--ink);
}

.iv-q-actions button.reviewed {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.iv-progress {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 22px;
  margin-bottom: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.iv-progress .label {
  color: var(--ink);
  font-weight: 600;
}

.iv-progress .bar {
  flex: 1;
  height: 8px;
  background: var(--bg-3);
  border-radius: 999px;
  overflow: hidden;
  min-width: 200px;
  margin: 0 14px;
}

.iv-progress .bar-fill {
  height: 100%;
  background: var(--accent);
  transition: width 0.3s;
}

.iv-progress .stat {
  color: var(--ink-2);
  font-size: 14px;
  font-family: var(--font-mono);
}

@media (max-width: 720px) {
  .iv-tips-grid {
    grid-template-columns: 1fr;
  }
  .iv-q-meta {
    display: none;
  }
}