/* ============================================================
   ai-security.css — AI驱动安全专题页专属样式
   与 style.css 全局变量完全兼容，不修改全局样式
   ============================================================ */

/* ===== SUBJECT HERO ===== */
.ai-hero {
    position: relative;
    min-height: 520px;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1a4e 50%, #0d1b3e 100%);
    padding-top: 72px;
}
#aiSecurityCanvas {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 1;
}
.ai-hero-overlay {
    position: absolute;
    inset: 0;
    z-index: 2;
    background: radial-gradient(ellipse at 70% 30%, rgba(26,110,255,0.15) 0%, transparent 60%);
    pointer-events: none;
}
.ai-hero-content {
    position: relative;
    z-index: 3;
    max-width: 1100px;
    margin: 0 auto;
    padding: 48px 24px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    align-items: center;
}
.ai-hero-left { color: white; }
.ai-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(0,198,255,0.12);
    color: #00c6ff;
    font-size: 12px;
    font-weight: 600;
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 20px;
    border: 1px solid rgba(0,198,255,0.2);
}
.ai-hero-badge::before {
    content: '';
    width: 6px; height: 6px;
    background: #00c6ff;
    border-radius: 50%;
    animation: pulse-glow 2s infinite;
}
@keyframes pulse-glow {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0,198,255,0.4); }
    50% { opacity: 0.7; box-shadow: 0 0 0 8px rgba(0,198,255,0); }
}
.ai-hero h1 {
    font-size: clamp(28px, 4vw, 44px);
    font-weight: 900;
    line-height: 1.15;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}
.ai-hero h1 .highlight {
    background: linear-gradient(135deg, #00c6ff 0%, #1a6eff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.ai-hero-left > p {
    font-size: 15px;
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 28px;
}
.ai-hero-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.ai-hero-stats .stat-box {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 12px;
    padding: 16px 20px;
    backdrop-filter: blur(10px);
}
.ai-hero-stats .stat-number {
    font-size: 28px;
    font-weight: 900;
    color: #00c6ff;
    line-height: 1;
    font-variant-numeric: tabular-nums;
}
.ai-hero-stats .stat-label {
    font-size: 12px;
    color: rgba(255,255,255,0.5);
    margin-top: 6px;
    font-weight: 500;
}
.ai-hero-right {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 16px;
    padding: 28px;
    backdrop-filter: blur(10px);
}
.ai-hero-right h3 {
    font-size: 14px;
    font-weight: 700;
    color: rgba(255,255,255,0.9);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.ai-hero-right h3 svg {
    width: 18px; height: 18px;
    color: #00c6ff;
}
.threat-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.threat-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: rgba(255,255,255,0.65);
    padding: 8px 12px;
    background: rgba(255,255,255,0.03);
    border-radius: 8px;
    border-left: 2px solid rgba(0,198,255,0.3);
}
.threat-item .threat-sev {
    font-size: 10px;
    font-weight: 700;
    padding: 2px 8px;
    border-radius: 100px;
    margin-left: auto;
    white-space: nowrap;
}
.threat-sev.critical { background: rgba(220,38,38,0.2); color: #f87171; }
.threat-sev.high { background: rgba(245,124,0,0.2); color: #fb923c; }
.threat-sev.medium { background: rgba(234,179,8,0.2); color: #facc15; }

/* ===== OVERVIEW ===== */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.overview-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
}
.overview-card:hover {
    border-color: rgba(26, 110, 255, 0.2);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}
.overview-card .ov-icon {
    width: 44px; height: 44px;
    background: var(--primary-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
}
.overview-card .ov-icon svg {
    width: 22px; height: 22px;
    color: var(--primary);
}
.overview-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 8px;
}
.overview-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
}
.overview-card .ov-data {
    margin-top: 14px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    font-size: 12px;
    color: var(--text-light);
}
.overview-card .ov-data strong {
    color: var(--primary);
    font-size: 18px;
    font-weight: 800;
}

/* ===== SUB-TOPIC CARDS ===== */
.subtopic-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.subtopic-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    display: block;
}
.subtopic-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #1a6eff, #00c6ff);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}
.subtopic-card:hover {
    border-color: rgba(26, 110, 255, 0.25);
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}
.subtopic-card:hover::before { transform: scaleX(1); }
.subtopic-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 14px;
}
.subtopic-card .icon-wrap {
    width: 48px; height: 48px;
    background: var(--primary-light);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.subtopic-card .icon-wrap svg {
    width: 24px; height: 24px;
    color: var(--primary);
}
.subtopic-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
}
.st-tag {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-light);
    padding: 3px 10px;
    border-radius: 100px;
}
.st-status {
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 100px;
}
.st-status.active {
    background: #e6f7ed;
    color: #2ea043;
}
.st-status.research {
    background: #fff7ed;
    color: #f57c00;
}
.subtopic-card h3 {
    font-size: 17px;
    font-weight: 700;
    margin-bottom: 8px;
}
.subtopic-card > p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}
.subtopic-card .tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 14px;
}
.subtopic-card .tag-list span {
    font-size: 11px;
    color: var(--primary);
    background: var(--primary-light);
    padding: 3px 10px;
    border-radius: 100px;
    font-weight: 500;
}
.subtopic-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 12px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
}
.subtopic-footer .arrow {
    width: 28px; height: 28px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: translateX(-8px);
    transition: var(--transition);
}
.subtopic-footer .arrow svg {
    width: 14px; height: 14px;
    color: var(--primary);
}
.subtopic-card:hover .arrow {
    opacity: 1;
    transform: translateX(0);
}

/* ===== DATA SECTION ===== */
.data-section {
    background: linear-gradient(180deg, var(--bg-warm) 0%, #ffffff 100%);
}
.data-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 40px;
}
.data-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}
.data-card:hover {
    border-color: rgba(26, 110, 255, 0.2);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}
.data-card .data-number {
    font-size: 32px;
    font-weight: 900;
    color: var(--primary);
    line-height: 1;
    font-variant-numeric: tabular-nums;
}
.data-card .data-unit {
    font-size: 14px;
    color: var(--primary);
    font-weight: 700;
}
.data-card .data-label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 8px;
    font-weight: 500;
}
.data-card .data-source {
    font-size: 11px;
    color: var(--text-light);
    margin-top: 6px;
}

/* Threat Landscape */
.threat-landscape {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
}
.threat-landscape h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.threat-landscape h3 svg {
    width: 22px; height: 22px;
    color: var(--primary);
}
.threat-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.threat-table th {
    text-align: left;
    padding: 12px 16px;
    background: var(--bg-warm);
    color: var(--text-secondary);
    font-weight: 600;
    border-bottom: 2px solid var(--border);
}
.threat-table td {
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: top;
}
.threat-table tr:hover td {
    background: var(--bg-warm);
}
.threat-table .trend-up {
    color: #dc2626;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.threat-table .trend-stable {
    color: var(--text-light);
    font-weight: 600;
}
.threat-sev-badge {
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 100px;
}
.threat-sev-badge.critical { background: #fef2f2; color: #dc2626; }
.threat-sev-badge.high { background: #fff7ed; color: #f57c00; }
.threat-sev-badge.medium { background: #fefce8; color: #a16207; }

/* ===== FRAMEWORK ===== */
.framework-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}
.framework-card {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: var(--transition);
}
.framework-card:hover {
    border-color: rgba(26, 110, 255, 0.2);
    box-shadow: var(--shadow-hover);
}
.framework-card .fw-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}
.framework-card .fw-icon {
    width: 40px; height: 40px;
    background: var(--primary-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.framework-card .fw-icon svg {
    width: 20px; height: 20px;
    color: var(--primary);
}
.framework-card h4 {
    font-size: 15px;
    font-weight: 700;
}
.framework-card .fw-org {
    font-size: 12px;
    color: var(--text-light);
    font-weight: 500;
}
.framework-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}
.framework-card .fw-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}
.framework-card .fw-meta span {
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 100px;
}
.fw-meta .version { background: var(--primary-light); color: var(--primary); }
.fw-meta .scope { background: var(--bg-warm); color: var(--text-light); }

/* ===== PAPERS ===== */
.paper-list-ai {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}
.paper-item-ai {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}
.paper-item-ai:hover {
    border-color: rgba(26, 110, 255, 0.2);
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}
.paper-item-ai .paper-badge {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 100px;
    margin-bottom: 10px;
}
.paper-badge.sp { background: #e0e7ff; color: #4338ca; }
.paper-badge.ase { background: #f0fdf4; color: #16a34a; }
.paper-badge.usenix { background: #fff7ed; color: #ea580c; }
.paper-badge.oopsla { background: #fef2f2; color: #dc2626; }
.paper-item-ai h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 6px;
    line-height: 1.4;
}
.paper-item-ai .paper-authors {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
}
.paper-item-ai .paper-venue {
    font-size: 11px;
    color: var(--text-light);
    margin-bottom: 10px;
}
.paper-item-ai .paper-abs {
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== TIMELINE ===== */
.ai-timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
}
.ai-timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0; bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-light) 50%, var(--border) 100%);
}
.ai-timeline-item {
    position: relative;
    padding-left: 60px;
    padding-bottom: 36px;
}
.ai-timeline-item:last-child { padding-bottom: 0; }
.ai-timeline-dot {
    position: absolute;
    left: 11px;
    top: 4px;
    width: 18px; height: 18px;
    background: white;
    border: 3px solid var(--border);
    border-radius: 50%;
    transition: var(--transition);
}
.ai-timeline-item.done .ai-timeline-dot {
    border-color: var(--primary);
    background: var(--primary);
}
.ai-timeline-item.active .ai-timeline-dot {
    border-color: var(--primary);
    background: var(--primary);
    box-shadow: 0 0 0 5px rgba(26, 110, 255, 0.15);
    animation: pulse-dot 2s infinite;
}
.ai-timeline-content {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 22px;
    transition: var(--transition);
}
.ai-timeline-content:hover {
    border-color: rgba(26, 110, 255, 0.2);
    box-shadow: var(--shadow);
}
.ai-timeline-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    flex-wrap: wrap;
}
.ai-phase {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary);
    background: var(--primary-light);
    padding: 3px 10px;
    border-radius: 100px;
}
.ai-status {
    font-size: 11px;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: 100px;
}
.ai-status.done { background: #e6f7ed; color: #2ea043; }
.ai-status.ongoing { background: #fff7ed; color: #f57c00; }
.ai-status.planned { background: #f0f0f5; color: var(--text-light); }
.ai-time {
    font-size: 12px;
    color: var(--text-light);
    margin-left: auto;
    font-weight: 500;
}
.ai-timeline-content h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
}
.ai-timeline-content > p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 10px;
}
.ai-timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.ai-timeline-tags span {
    font-size: 11px;
    color: var(--primary);
    background: var(--primary-light);
    padding: 3px 10px;
    border-radius: 100px;
    font-weight: 500;
}

/* ===== BREADCRUMB ===== */
.breadcrumb-wrap {
    background: var(--bg-warm);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
}
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-light);
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}
.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb .current { color: var(--primary); font-weight: 600; }

/* ===== SUBPAGE HERO ===== */
.subpage-hero {
    background: linear-gradient(135deg, #0a0e27 0%, #1a1a4e 50%, #0d1b3e 100%);
    padding: 120px 0 60px;
    color: white;
    text-align: center;
}
.subpage-hero h1 {
    font-size: clamp(26px, 4vw, 38px);
    font-weight: 900;
    margin-bottom: 12px;
}
.subpage-hero h1 .highlight {
    background: linear-gradient(135deg, #00c6ff 0%, #1a6eff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.subpage-hero p {
    font-size: 15px;
    color: rgba(255,255,255,0.7);
    max-width: 640px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ===== CONTENT SECTIONS ===== */
.content-section {
    padding: 48px 0;
}
.content-section.alt { background: var(--bg-warm); }
.content-block {
    background: white;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    margin-bottom: 24px;
}
.content-block h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.content-block h3 svg {
    width: 20px; height: 20px;
    color: var(--primary);
}
.content-block p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}
.content-block ul {
    margin-left: 20px;
    margin-bottom: 12px;
}
.content-block ul li {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 6px;
}
.content-block .highlight-box {
    background: var(--primary-light);
    border-left: 3px solid var(--primary);
    padding: 16px 20px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 16px 0;
}
.content-block .highlight-box p {
    margin: 0;
    color: var(--text);
    font-weight: 500;
}

/* ===== TECH GRID ===== */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.tech-card {
    background: var(--bg-warm);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 20px;
}
.tech-card h4 {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}
.tech-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

/* ===== CASE TABLE ===== */
.case-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.case-table th {
    text-align: left;
    padding: 12px 16px;
    background: var(--bg-warm);
    color: var(--text-secondary);
    font-weight: 600;
    border-bottom: 2px solid var(--border);
}
.case-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    color: var(--text);
    vertical-align: top;
}
.case-table tr:hover td { background: var(--bg-warm); }
.case-table .case-time { color: var(--text-light); font-size: 12px; white-space: nowrap; }
.case-table .case-sev { font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 100px; }
.case-sev.critical { background: #fef2f2; color: #dc2626; }
.case-sev.high { background: #fff7ed; color: #f57c00; }

/* ===== REFERENCE LIST ===== */
.ref-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.ref-item {
    display: flex;
    gap: 12px;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.7;
    padding: 10px 14px;
    background: var(--bg-warm);
    border-radius: var(--radius-sm);
}
.ref-item .ref-num {
    color: var(--primary);
    font-weight: 700;
    flex-shrink: 0;
}
.ref-item a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}
.ref-item a:hover { text-decoration: underline; }

/* ===== MOBILE ===== */
@media (max-width: 1024px) {
    .ai-hero-content { grid-template-columns: 1fr; }
    .ai-hero-right { display: none; }
    .overview-grid { grid-template-columns: repeat(2, 1fr); }
    .subtopic-grid { grid-template-columns: repeat(2, 1fr); }
    .data-grid { grid-template-columns: repeat(2, 1fr); }
    .framework-grid { grid-template-columns: 1fr; }
    .paper-list-ai { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .ai-hero { min-height: 420px; padding-top: 96px; }
    .ai-hero h1 { font-size: clamp(24px, 7vw, 32px); }
    .ai-hero-stats { grid-template-columns: 1fr 1fr; }
    .overview-grid { grid-template-columns: 1fr; }
    .subtopic-grid { grid-template-columns: 1fr; }
    .data-grid { grid-template-columns: 1fr 1fr; }
    .threat-table { font-size: 12px; }
    .threat-table th, .threat-table td { padding: 10px 8px; }
    .case-table { font-size: 12px; }
    .case-table th, .case-table td { padding: 10px 8px; }
    .contact-box { padding: 40px 24px; }
    .contact-box h3 { font-size: 22px; }
    .contact-actions { flex-direction: column; align-items: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .section { padding: 48px 0; }
    .content-block { padding: 20px; }
}


/* ===== CONTACT BOX (CTA) ===== */
.contact-box {
    background: var(--primary-gradient);
    border-radius: var(--radius);
    padding: 60px 48px;
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.contact-bg {
    position: absolute;
    top: -50%; right: -20%;
    width: 400px; height: 400px;
    background: rgba(255, 255, 255, 0.08);
    border-radius: 50%;
}
.contact-content {
    position: relative;
    z-index: 1;
}
.contact-box h3 {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 12px;
    color: white;
}
.contact-box p {
    font-size: 15px;
    color: rgba(255, 255, 255, 0.85);
    max-width: 520px;
    margin: 0 auto 28px;
    line-height: 1.8;
}
.contact-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.contact-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-family: inherit;
}
.contact-btn-primary {
    background: white;
    color: var(--primary);
}
.contact-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}
.contact-btn-secondary {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}
.contact-btn-secondary:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

/* ===== SUBPAGE RETURN BUTTON FIX ===== */
.content-section.alt .contact-btn {
    margin-top: 0;
}

/* ===== 2026-09 内容增强组件 ===== */
.data-source-note{font-size:12px;color:var(--text-light);margin-top:12px;padding:10px 14px;background:var(--bg-warm);border-radius:8px;line-height:1.7;border-left:3px solid var(--border);}
.data-source-note strong{color:var(--text-secondary);}
details.faq{border:1px solid var(--border);border-radius:12px;margin-bottom:12px;background:#fff;transition:var(--transition);}
details.faq summary{cursor:pointer;padding:16px 20px;font-weight:600;font-size:14px;list-style:none;display:flex;align-items:center;gap:10px;color:var(--text);user-select:none;}
details.faq summary::-webkit-details-marker{display:none;}
details.faq summary::before{content:'+';width:22px;height:22px;flex-shrink:0;background:var(--primary-light);color:var(--primary);border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;transition:transform .25s;}
details.faq[open] summary::before{transform:rotate(45deg);}
details.faq .faq-body{padding:0 20px 16px 52px;font-size:13px;color:var(--text-secondary);line-height:1.8;}
.flow-steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px;margin:8px 0 4px;}
.flow-step{background:var(--bg-warm);border:1px solid var(--border);border-radius:10px;padding:14px;position:relative;}
.flow-step .fs-num{font-size:11px;color:var(--primary);font-weight:700;letter-spacing:.5px;}
.flow-step h5{font-size:13px;margin:5px 0 6px;color:var(--text);font-weight:700;}
.flow-step p{font-size:12px;color:var(--text-secondary);margin:0;line-height:1.6;}
.case-quote{border-left:3px solid #f57c00;background:#fff7ed;padding:14px 18px;border-radius:0 8px 8px 0;font-size:13px;color:var(--text-secondary);margin:14px 0;line-height:1.8;}
.case-quote strong{color:var(--text);}
.gov-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;}
@media (max-width:768px){.gov-grid{grid-template-columns:1fr;}details.faq .faq-body{padding-left:20px;}}

/* ===== 2026-09-05 移动端导航/页脚自适应加固（专题内自包含，不依赖外部 style.css） ===== */
.mobile-toggle{display:none;background:none;}
@media (max-width:1024px){
    .navbar{position:relative;z-index:1000;}
    .nav-container{position:relative;}
    .mobile-toggle{display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;width:40px;height:40px;border:none;cursor:pointer;padding:6px;z-index:1001;}
    .mobile-toggle span{display:block;width:22px;height:2px;background:currentColor;border-radius:2px;transition:transform .3s,opacity .3s;}
    .mobile-toggle.active span:nth-child(1){transform:translateY(7px) rotate(45deg);}
    .mobile-toggle.active span:nth-child(2){opacity:0;}
    .mobile-toggle.active span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}
    .nav-links{display:none;position:absolute;top:100%;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;list-style:none;margin:0;padding:8px 16px 16px;background:var(--bg-card,#fff);border-top:1px solid var(--border,#eee);box-shadow:0 14px 32px rgba(0,0,0,.12);max-height:calc(100vh - 72px);overflow-y:auto;z-index:999;}
    .nav-links.active{display:flex;}
    .nav-links li{width:100%;display:block;}
    .nav-links li a{display:block;padding:13px 10px;font-size:15px;border-bottom:1px solid #f0f0f5;color:var(--text,#222);}
    .nav-links li a:hover,.nav-links li a.active{color:var(--primary,#1a6eff);}
    .nav-links li a.active{font-weight:700;}
    .ai-hero{padding-top:110px;}
    .footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px;}
}
@media (max-width:768px){
    .subpage-hero{padding:100px 0 48px;}
    .breadcrumb{padding:0 16px;font-size:12px;flex-wrap:wrap;row-gap:4px;}
    .footer-grid{display:grid !important;grid-template-columns:1fr !important;gap:26px;}
    .footer-brand p{font-size:13px;line-height:1.8;}
    .footer-col ul{display:flex;flex-direction:column;gap:4px;}
    .footer-col li a{display:inline-block;padding:3px 0;}
    .footer-bottom p{font-size:12px;line-height:1.8;}
}

/* ===== 2026-09-05 子课题卡片"查看详情"统一居底对齐 ===== */
.subtopic-grid>.subtopic-card{display:flex;flex-direction:column;}
.subtopic-grid>.subtopic-card .subtopic-footer{margin-top:auto;}