/* ======================================================
   KP Card 样式 — 结构化知识点卡片
   用于 math、politics、408/review 三页的 KP 模式
   依赖：common.css 的设计令牌
   ====================================================== */

/* ----- Slide / KP Card container ----- */
.slide-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px 32px;
    margin-bottom: 24px;
}
.slide-card h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid rgba(217,115,13,0.1);
}
.slide-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin: 16px 0 8px;
    color: #1d1d1f;
}
.slide-card h4 {
    font-size: 15px;
    font-weight: 600;
    margin: 12px 0 6px;
    color: #333;
}
.slide-card p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 8px;
    color: #444;
}
.slide-card ul, .slide-card ol {
    font-size: 14px;
    line-height: 1.8;
    margin: 8px 0 8px 20px;
    color: #444;
}
.slide-card li { margin-bottom: 4px; }

.slide-card code {
    font-family: var(--font-mono);
    background: rgba(0,0,0,0.04);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: #c0392b;
}
.slide-card pre {
    background: #1e1e2e;
    color: #cdd6f4;
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.6;
    margin: 12px 0;
    font-family: var(--font-mono);
}
.slide-card pre code {
    background: none;
    padding: 0;
    color: inherit;
}
.slide-card table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 13px;
}
.slide-card th, .slide-card td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
}
.slide-card th {
    background: var(--primary-light);
    font-weight: 600;
    color: var(--primary);
}

/* Slide grid helpers */
.slide-card .grid { display: grid; gap: 16px; margin: 12px 0; }
.slide-card .grid.g2 { grid-template-columns: 1fr 1fr; }
.slide-card .grid.g3 { grid-template-columns: 1fr 1fr 1fr; }
.slide-card .card {
    background: rgba(0,0,0,0.02);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
}
.slide-card .card-accent { border-left: 3px solid var(--primary); }

.slide-card .cmp {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin: 12px 0;
}
.slide-card .cmp .pro { border-left: 3px solid #27ae60; }
.slide-card .cmp .con { border-left: 3px solid #e74c3c; }
.slide-card .c-h { font-size: 13px; font-weight: 600; margin-bottom: 8px; color: #555; }

/* Visualization / code block */
.slide-card .viz {
    font-family: var(--font-mono);
    background: #1e1e2e;
    color: #cdd6f4;
    padding: 12px;
    border-radius: 6px;
    font-size: 12px;
    line-height: 1.5;
    overflow-x: auto;
    white-space: pre;
}
.slide-card .viz code { white-space: pre; }

/* Kicker (chapter label above title) */
.kicker {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 4px;
}

.slide-card .lede   { font-size: 15px; color: #666; line-height: 1.6; }
.slide-card .dim    { color: #888; }
.slide-card .mono   { font-family: var(--font-mono); }

/* Big-O complexity badges */
.slide-card .bigo {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 4px;
    margin: 2px;
}
.slide-card .o-1     { background: #d4edda; color: #155724; }
.slide-card .o-logn  { background: #cce5ff; color: #004085; }
.slide-card .o-n     { background: #fff3cd; color: #856404; }
.slide-card .o-nlogn { background: #ffeaa7; color: #6c5ce7; }
.slide-card .o-n2    { background: #f8d7da; color: #721c24; }

/* ---- KP Card specific (structured knowledge points) ---- */

.kp-card .kp-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin-bottom: 12px;
}
.kp-tag {
    font-size: 11px;
    padding: 2px 10px;
    border-radius: 10px;
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 500;
}

.kp-section {
    margin: 14px 0;
    padding: 14px 16px;
    border-radius: var(--radius);
    background: rgba(0,0,0,0.01);
    border: 1px solid var(--border-light);
}
.kp-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--primary);
    font-weight: 700;
    margin-bottom: 8px;
}

/* KP section variants */
.kp-definition {
    border-left: 4px solid var(--primary);
    background: rgba(217,115,13,0.02);
}
.kp-keypoints ul {
    padding-left: 20px;
    font-size: 14px;
    line-height: 2;
    color: #444;
}
.kp-keypoints li { margin-bottom: 2px; }

.kp-code {
    background: #1e1e2e;
    color: #cdd6f4;
    padding: 16px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    font-size: 13px;
    line-height: 1.6;
    font-family: var(--font-mono);
    white-space: pre-wrap;
}

.kp-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.kp-table th, .kp-table td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
}
.kp-table th {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 600;
}

/* KP callouts */
.kp-tip, .kp-pitfall, .kp-memory, .kp-note {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    font-size: 14px;
    line-height: 1.7;
    padding: 12px 16px;
}
.kp-tip {
    background: rgba(211,84,0,0.04);
    border: 1px solid rgba(211,84,0,0.12);
    border-radius: var(--radius);
    color: #555;
}
.kp-pitfall {
    background: rgba(235,87,87,0.04);
    border: 1px solid rgba(235,87,87,0.12);
    border-radius: var(--radius);
    color: #555;
}
.kp-memory {
    background: rgba(124,58,237,0.04);
    border: 1px solid rgba(124,58,237,0.12);
    border-radius: var(--radius);
    color: #555;
}
.kp-note {
    background: rgba(0,0,0,0.02);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: #888;
    font-size: 13px;
}

/* KP example (with hidden answer) */
.kp-example {
    border-left: 4px solid #27ae60;
    background: rgba(39,174,96,0.02);
}
.kp-example-q {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 8px;
}
.kp-example-a {
    cursor: pointer;
    font-size: 14px;
}
.kp-answer-hidden { color: #27ae60; font-weight: 600; }
.kp-answer-text   { display: none; }
.kp-example-a.show .kp-answer-hidden { display: none; }
.kp-example-a.show .kp-answer-text   { display: inline; color: #27ae60; font-weight: 600; }
.kp-example-s {
    font-size: 13px;
    color: #666;
    margin-top: 8px;
    padding: 10px;
    background: rgba(0,0,0,0.02);
    border-radius: 6px;
    white-space: pre-wrap;
    font-family: var(--font-mono);
}

.kp-formula {
    text-align: center;
    font-size: 18px;
    padding: 20px;
    background: rgba(217,115,13,0.02);
    border-radius: var(--radius);
}

/* KP timeline */
.kp-timeline { padding: 10px 0; }
.tl-step {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 8px 0;
}
.tl-dot {
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--primary);
    flex-shrink: 0;
}
.tl-line {
    width: 2px;
    height: 16px;
    background: rgba(217,115,13,0.15);
    margin-left: 4px;
}
.tl-text { font-size: 14px; color: #444; }

/* KP related links */
.kp-related {
    margin-top: 20px;
    padding: 14px 16px;
    background: rgba(0,0,0,0.02);
    border-radius: var(--radius);
    border: 1px dashed var(--border);
}
.kp-related-title {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.kp-related-list {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}
.kp-related-list .pill {
    font-size: 12px;
    padding: 4px 12px;
    border: 1px solid var(--border);
    border-radius: 16px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: 0.2s;
}
.kp-related-list .pill:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: rgba(217,115,13,0.2);
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    .slide-card { padding: 20px; }
    .slide-card .grid.g2,
    .slide-card .grid.g3,
    .slide-card .cmp {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 480px) {
    .slide-card .viz { font-size: 11px; padding: 8px; }
}