:root {
            --primary-deep: #1d4ed8;
            --primary-bright: #3b82f6;
            --secondary-gold: #d97706;
            --secondary-warm: #f59e0b;
            --alert-red: #dc2626;
            --alert-soft: #fef2f2;
            --bg-warm: #fefcf5;
            --surface: #ffffff;
            --text-main: #1a1a2e;
            --text-muted: #6b7280;
            --text-soft: #9ca3af;
            --border: #e5e7eb;
            --border-light: #f0f0eb;
            --footer-bg: #f8f6f0;
            --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.04);
            --shadow-md: 0 12px 32px rgba(26, 26, 46, 0.07);
            --shadow-lg: 0 24px 48px rgba(26, 26, 46, 0.14);
            --radius-xl: 22px;
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --transition: all 0.2s ease;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            color: var(--text-main);
            background-color: var(--bg-warm);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            font-display: swap;
        }

        /* ===== 头部导航（与首页一致） ===== */
        header {
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            z-index: 100;
        }
        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 14px 20px;
        }
        .logo a {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 21px;
            font-weight: 800;
            color: var(--text-main);
            text-decoration: none;
            letter-spacing: -0.5px;
        }
        .logo svg {
            width: 30px;
            height: 30px;
            fill: none;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-links a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            transition: var(--transition);
            padding: 8px 16px;
            border-radius: 20px;
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--primary-deep);
            background: rgba(29, 78, 216, 0.05);
        }
        .nav-links a.active-page {
            color: var(--alert-red);
            background: rgba(220, 38, 38, 0.07);
            font-weight: 700;
        }
        .nav-links a.nav-highlight {
            color: #dc2626;
            font-weight: 700;
        }
        .nav-links a.nav-highlight:hover {
            background: rgba(220, 38, 38, 0.06);
            color: #b91c1c;
        }

        /* ===== 页面通用标题 ===== */
        .section-heading {
            font-size: 27px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 36px;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .section-heading::before {
            content: '';
            width: 5px;
            height: 26px;
            background: linear-gradient(180deg, #dc2626 0%, #d97706 100%);
            border-radius: 3px;
            flex-shrink: 0;
        }

        /* ===== 主视觉区 ===== */
        .hero-report {
            max-width: 1200px;
            margin: 0 auto;
            padding: 60px 20px 30px;
            text-align: center;
        }
        .hero-report h1 {
            font-size: 40px;
            font-weight: 800;
            letter-spacing: -1px;
            line-height: 1.2;
            color: var(--text-main);
            margin-bottom: 16px;
        }
        .hero-report h1 .gradient-text {
            background: linear-gradient(135deg, #dc2626 0%, #d97706 70%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .hero-report>p {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }
        .alert-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--alert-soft);
            border: 1px solid #fecaca;
            padding: 6px 18px;
            border-radius: 24px;
            font-size: 13px;
            font-weight: 700;
            color: var(--alert-red);
            margin-top: 12px;
        }
        .alert-badge::before {
            content: '⚠️';
            font-size: 16px;
        }

        /* ===== 安全数据看板 ===== */
        .stats-dashboard {
            max-width: 1200px;
            margin: 50px auto;
            padding: 0 20px;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
        }
        .stat-card {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .stat-card:hover {
            border-color: var(--alert-red);
            box-shadow: var(--shadow-md);
        }
        .stat-number {
            font-size: 34px;
            font-weight: 900;
            color: var(--alert-red);
            letter-spacing: -1px;
            line-height: 1.1;
            margin-bottom: 6px;
        }
        .stat-label {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-main);
        }
        .stat-desc {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* ===== 飞行事故报告单（创意表单） ===== */
        .report-form-section {
            max-width: 1200px;
            margin: 60px auto;
            padding: 0 20px;
        }
        .form-card {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: 40px 36px;
            box-shadow: var(--shadow-sm);
            position: relative;
            overflow: hidden;
        }
        .form-card::before {
            content: '';
            position: absolute;
            top: -30px;
            right: -30px;
            width: 120px;
            height: 120px;
            background: radial-gradient(circle, rgba(220, 38, 38, 0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin-top: 28px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }
        .form-group.full-width {
            grid-column: span 2;
        }
        .form-group label {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-main);
        }
        .form-group select,
        .form-group input,
        .form-group textarea {
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-family: inherit;
            background: var(--bg-warm);
            transition: var(--transition);
            resize: vertical;
        }
        .form-group select:focus,
        .form-group input:focus,
        .form-group textarea:focus {
            outline: none;
            border-color: var(--alert-red);
            box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1);
        }
        .btn-submit-report {
            background: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
            color: #ffffff;
            border: none;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 15px;
            cursor: pointer;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            grid-column: span 2;
            justify-self: start;
            margin-top: 10px;
        }
        .btn-submit-report:hover {
            background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
            box-shadow: 0 8px 22px rgba(220, 38, 38, 0.35);
            transform: translateY(-2px);
        }
        .form-note {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 18px;
            border-left: 3px solid var(--alert-red);
            padding-left: 16px;
            background: var(--alert-soft);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            line-height: 1.6;
        }

        /* ===== 社区安全公告板 ===== */
        .policy-section {
            max-width: 1200px;
            margin: 60px auto;
            padding: 0 20px;
        }
        .policy-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }
        .policy-card {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .policy-card:hover {
            border-color: var(--secondary-gold);
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .policy-icon {
            font-size: 32px;
            margin-bottom: 14px;
        }
        .policy-card h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .policy-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== 举报流程三步 ===== */
        .flow-section {
            max-width: 1200px;
            margin: 60px auto;
            padding: 0 20px;
        }
        .flow-steps {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 24px;
        }
        .flow-card {
            text-align: center;
            padding: 30px 18px;
            border-radius: var(--radius-lg);
            background: var(--surface);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            position: relative;
        }
        .flow-card:hover {
            border-color: var(--alert-red);
            box-shadow: var(--shadow-md);
        }
        .flow-num {
            font-size: 48px;
            font-weight: 900;
            color: rgba(220, 38, 38, 0.06);
            position: absolute;
            top: 6px;
            right: 16px;
            line-height: 1;
        }
        .flow-card h4 {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }
        .flow-card p {
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== 常见举报问答 ===== */
        .faq-section {
            max-width: 1200px;
            margin: 60px auto;
            padding: 0 20px;
        }
        .faq-inner {
            background: var(--surface);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-xl);
            padding: 40px 36px;
            box-shadow: var(--shadow-sm);
        }
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 14px;
        }
        .faq-item {
            border: 1px solid var(--border-light);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
            background: var(--bg-warm);
        }
        .faq-item:hover {
            border-color: var(--alert-red);
        }
        .faq-item summary {
            padding: 16px 20px;
            font-weight: 700;
            font-size: 14px;
            color: var(--text-main);
            cursor: pointer;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '+';
            font-size: 19px;
            color: var(--alert-red);
            font-weight: 400;
        }
        .faq-item[open] summary::after {
            content: '−';
        }
        .faq-item[open] summary {
            background: var(--alert-soft);
            color: var(--alert-red);
        }
        .faq-item p {
            padding: 0 20px 18px;
            font-size: 13px;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ===== 页脚（与首页一致） ===== */
        .site-footer {
            background-color: var(--footer-bg);
            border-top: 1px solid var(--border-light);
            padding: 70px 20px 36px;
            color: var(--text-main);
        }
        .footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1.5fr;
            gap: 50px;
            padding-bottom: 44px;
            border-bottom: 1px solid var(--border-light);
        }
        .footer-brand h4 {
            font-size: 19px;
            font-weight: 800;
            margin-bottom: 10px;
        }
        .footer-brand p {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 20px;
            max-width: 360px;
            line-height: 1.7;
        }
        .footer-status {
            display: inline-flex;
            align-items: center;
            gap: 7px;
            background: var(--surface);
            border: 1px solid var(--border-light);
            padding: 5px 13px;
            border-radius: 6px;
            font-size: 11px;
            color: #16a34a;
            font-weight: 700;
        }
        .footer-status::before {
            content: '';
            width: 5px;
            height: 5px;
            background: #16a34a;
            border-radius: 50%;
            animation: pulse-dot 2.4s infinite;
        }
        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
            }
            50% {
                opacity: 0.35;
            }
        }
        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }
        .footer-col h5 {
            font-size: 13px;
            font-weight: 700;
            text-transform: uppercase;
            color: var(--text-main);
            margin-bottom: 14px;
            letter-spacing: 0.4px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 8px;
        }
        .footer-col ul li a {
            font-size: 13px;
            color: var(--text-muted);
            text-decoration: none;
            transition: color 0.15s;
        }
        .footer-col ul li a:hover {
            color: #1d4ed8;
        }
        .footer-bar {
            max-width: 1200px;
            margin: 34px auto 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: var(--text-soft);
            flex-wrap: wrap;
            gap: 14px;
        }
        .sha-badge {
            font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
            background: var(--surface);
            padding: 3px 11px;
            border-radius: 4px;
            border: 1px solid var(--border-light);
            color: var(--text-main);
            font-size: 11px;
        }

        /* 响应式 */
        @media (max-width: 992px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 36px;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-group.full-width {
                grid-column: span 1;
            }
            .btn-submit-report {
                grid-column: span 1;
            }
            .hero-report h1 {
                font-size: 30px;
            }
        }
        @media (max-width: 768px) {
            .footer-links {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bar {
                flex-direction: column;
                text-align: center;
            }
            .nav-links {
                display: none;
            }
            .hero-report h1 {
                font-size: 26px;
            }
            .section-heading {
                font-size: 21px;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 480px) {
            .form-card {
                padding: 24px 18px;
            }
            .hero-report {
                padding: 50px 14px 24px;
            }
        }
        @media (prefers-reduced-motion: reduce) {
            .btn-submit-report:hover,
            .policy-card:hover {
                transform: none;
            }
            * {
                transition-duration: 0.01ms !important;
            }
        }