/* ============================================
   首页门户样式 v2.0
   ============================================ */

/* 英雄区 */
.kd-hero {
    margin: 0 0 32px;
    padding: 48px 40px 42px;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    border-radius: 16px;
    color: #e2e8f0;
    position: relative;
    overflow: hidden;
}
.kd-hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(37,99,235,.15) 0%, transparent 70%);
    pointer-events: none;
}
.kd-hero h1 {
    margin: 0 0 8px;
    font-size: 30px;
    font-weight: 800;
    color: #fff;
    letter-spacing: -.02em;
    position: relative;
}
.kd-hero .kd-sub {
    margin: 0 0 18px;
    font-size: 16px;
    color: #60a5fa;
    font-weight: 600;
    position: relative;
}
.kd-hero .kd-desc {
    margin: 0 0 24px;
    font-size: 15px;
    line-height: 1.8;
    color: #94a3b8;
    max-width: 580px;
    position: relative;
}

.kd-actions { margin: 0; position: relative; }
.kd-btn {
    display: inline-block;
    margin-right: 12px;
    padding: 10px 22px;
    border: 1px solid #475569;
    border-radius: 8px;
    color: #e2e8f0;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all .15s;
}
.kd-btn:hover {
    border-color: #60a5fa;
    color: #fff;
    background: rgba(96,165,250,.1);
}
.kd-btn-a {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.kd-btn-a:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

/* 章节标题 */
.kd-h {
    margin: 36px 0 20px;
    padding-bottom: 10px;
    font-size: 20px;
    font-weight: 700;
    border-bottom: 2px solid var(--border);
    color: var(--text);
}

/* 网格 */
.kd-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.kd-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* 系列卡片 */
.kd-card {
    display: block;
    padding: 20px 22px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-card);
    text-decoration: none;
    color: inherit;
    transition: transform .2s, box-shadow .2s, border-color .2s;
}
.kd-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}
.kd-card strong {
    display: block;
    margin: 8px 0 6px;
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
}
.kd-card p {
    margin: 0;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}
.kd-tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    background: var(--accent-light);
    color: var(--accent);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .04em;
}

/* 事实区 */
.kd-facts {
    margin: 32px 0 8px;
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}
.kd-facts strong {
    font-size: 14px;
    font-weight: 700;
    color: var(--text);
}
.kd-facts p {
    margin: 6px 0 0;
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* 响应式 */
@media (max-width: 768px) {
    .kd-grid, .kd-grid-4 { grid-template-columns: 1fr; }
    .kd-hero { padding: 32px 24px; }
    .kd-hero h1 { font-size: 24px; }
    .kd-hero .kd-sub { font-size: 14px; }
}