/* ============================================================
           Hero
           ============================================================ */
        .fb-hero {
            position: relative;
            background: #ffffff;
            border: 1px solid #eef2f6;
            border-radius: 20px;
            padding: 36px 40px;
            margin-bottom: 20px;
            overflow: hidden;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
            text-align: center;
        }
        .fb-hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, #4a6cf7, #7c3aed, #a855f7);
            opacity: 0.85;
        }
        .fb-hero::after {
            content: '';
            position: absolute;
            right: -120px;
            bottom: -120px;
            width: 320px;
            height: 320px;
            background: radial-gradient(circle, rgba(74, 108, 247, 0.05), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .fb-hero-inner {
            position: relative;
            z-index: 2;
        }
        .fb-hero-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: linear-gradient(135deg, #eef2ff, #e0e7ff);
            color: #4a6cf7;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            margin-bottom: 16px;
            border: 1px solid #d0d9f0;
        }
        .fb-hero h1 {
            font-size: 30px;
            font-weight: 700;
            color: #1a202c;
            margin: 0 0 10px;
            letter-spacing: 0.3px;
        }
        .fb-hero p {
            font-size: 15px;
            color: #718096;
            margin: 0 auto;
            line-height: 1.7;
            max-width: 640px;
        }
        .fb-hero-tags {
            display: flex;
            gap: 8px;
            margin-top: 18px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .fb-hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: #f8fafc;
            color: #4a5568;
            padding: 5px 14px;
            border-radius: 30px;
            font-size: 12.5px;
            border: 1px solid #eef2f6;
            transition: all 0.2s;
        }
        .fb-hero-tag i { color: #4a6cf7; font-size: 13px; }
        .fb-hero-tag:hover {
            border-color: #4a6cf7;
            color: #4a6cf7;
            background: #f0f5ff;
        }

        /* ============================================================
           通用卡片
           ============================================================ */
        .fb-card {
            background: #ffffff;
            border-radius: 16px;
            border: 1px solid #eef2f6;
            padding: 24px 28px;
            margin-bottom: 20px;
            box-shadow: 0 1px 4px rgba(0, 0, 0, 0.02);
        }
        .fb-card-title {
            font-size: 18px;
            font-weight: 600;
            color: #1a202c;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            padding-bottom: 14px;
            border-bottom: 2px solid #f0f2f5;
        }
        .fb-card-title i {
            color: #4a6cf7;
            background: rgba(74, 108, 247, 0.1);
            padding: 7px 9px;
            border-radius: 9px;
            font-size: 18px;
        }

        /* ============================================================
           反馈类型卡片（4 类场景）
           ============================================================ */
        .fb-types {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
        }
        @media (max-width: 900px) {
            .fb-types { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 480px) {
            .fb-types { grid-template-columns: 1fr; }
        }
        .fb-type-item {
            padding: 20px 18px;
            background: linear-gradient(145deg, #fafbfc, #ffffff);
            border: 1.5px solid #eef2f6;
            border-radius: 14px;
            transition: all 0.25s;
            position: relative;
            overflow: hidden;
        }
        .fb-type-item::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 3px;
            height: 100%;
            background: linear-gradient(180deg, #4a6cf7, #7c3aed);
            opacity: 0;
            transition: opacity 0.25s;
        }
        .fb-type-item:hover {
            border-color: #d0d9f0;
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(74, 108, 247, 0.06);
        }
        .fb-type-item:hover::before { opacity: 1; }

        .fb-type-item .type-icon {
            width: 44px;
            height: 44px;
            border-radius: 11px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 12px;
        }
        .fb-type-item .type-icon.blue   { background: rgba(74,108,247,0.1); color: #4a6cf7; }
        .fb-type-item .type-icon.green  { background: rgba(56,161,105,0.1); color: #38a169; }
        .fb-type-item .type-icon.purple { background: rgba(124,58,237,0.1); color: #7c3aed; }
        .fb-type-item .type-icon.orange { background: rgba(237,137,54,0.1); color: #ed8936; }

        .fb-type-item strong {
            display: block;
            font-size: 15px;
            color: #1a202c;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .fb-type-item p {
            font-size: 12.5px;
            color: #718096;
            line-height: 1.6;
            margin: 0;
        }

        /* ============================================================
           表单
           ============================================================ */
        .fb-form-group {
            margin-bottom: 20px;
        }
        .fb-form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: #2d3748;
            margin-bottom: 8px;
        }
        .fb-form-group label .required {
            color: #e53e3e;
            margin-left: 2px;
        }
        .fb-form-group label .hint {
            font-size: 12px;
            font-weight: 400;
            color: #a0aec0;
            margin-left: 6px;
        }

        /* 类型按钮组 */
        .fb-type-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .fb-type-btn {
            padding: 9px 18px;
            background: #f7fafc;
            border: 1.5px solid #e2e8f0;
            border-radius: 10px;
            font-size: 13.5px;
            color: #4a5568;
            cursor: pointer;
            transition: all 0.2s;
            font-family: inherit;
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .fb-type-btn i { font-size: 15px; }
        .fb-type-btn:hover {
            border-color: #d0d9f0;
            background: #f0f5ff;
            color: #4a6cf7;
        }
        .fb-type-btn.active {
            border-color: #4a6cf7;
            background: #f0f5ff;
            color: #4a6cf7;
            font-weight: 600;
            box-shadow: 0 2px 8px rgba(74, 108, 247, 0.08);
        }

        /* 输入框 */
        .fb-input,
        .fb-textarea {
            width: 100%;
            padding: 12px 16px;
            border: 1.5px solid #e2e8f0;
            border-radius: 12px;
            font-size: 14.5px;
            color: #2d3748;
            background: #f7fafc;
            outline: none;
            transition: all 0.2s;
            font-family: inherit;
            box-sizing: border-box;
        }
        .fb-input:focus,
        .fb-textarea:focus {
            border-color: #4a6cf7;
            background: #ffffff;
            box-shadow: 0 0 0 4px rgba(74, 108, 247, 0.08);
        }
        .fb-input::placeholder,
        .fb-textarea::placeholder {
            color: #a0aec0;
        }
        .fb-textarea {
            min-height: 160px;
            resize: vertical;
            line-height: 1.7;
        }

        .fb-counter {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 6px;
            font-size: 12.5px;
            color: #a0aec0;
        }

        /* 提交按钮 */
        .fb-actions {
            text-align: center;
            margin-top: 26px;
        }
        .fb-submit-btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 48px;
            background: linear-gradient(135deg, #4a6cf7, #6a8cff);
            color: #fff;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 16px rgba(74, 108, 247, 0.28);
            font-family: inherit;
        }
        .fb-submit-btn:hover:not(:disabled) {
            transform: translateY(-3px);
            box-shadow: 0 10px 28px rgba(74, 108, 247, 0.38);
        }
        .fb-submit-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }
        .fb-submit-btn .ri-loader-4-line {
            animation: spin 1s linear infinite;
        }
        @keyframes spin { to { transform: rotate(360deg); } }

        /* 提交成功提示 */
        .fb-success {
            display: none;
            padding: 40px 24px;
            text-align: center;
            background: linear-gradient(145deg, #f0fff4, #f7fafc);
            border-radius: 14px;
            border: 1.5px solid #9ae6b4;
        }
        .fb-success.active { display: block; animation: fadeIn 0.4s ease; }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(8px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .fb-success i.success-icon {
            font-size: 56px;
            color: #38a169;
            display: block;
            margin-bottom: 14px;
        }
        .fb-success h3 {
            font-size: 20px;
            color: #22543d;
            font-weight: 700;
            margin: 0 0 8px;
        }
        .fb-success p {
            font-size: 14px;
            color: #2f855a;
            line-height: 1.7;
            margin: 0 0 20px;
        }
        .fb-success-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 24px;
            background: #38a169;
            color: #fff;
            border-radius: 10px;
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            transition: all 0.25s;
            border: none;
            cursor: pointer;
            font-family: inherit;
        }
        .fb-success-btn:hover {
            background: #2f855a;
            transform: translateY(-2px);
        }

        /* ============================================================
           处理流程
           ============================================================ */
        .fb-flow {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        @media (max-width: 768px) {
            .fb-flow { grid-template-columns: 1fr 1fr; gap: 12px; }
        }
        .fb-flow-step {
            text-align: center;
            padding: 20px 14px;
            background: linear-gradient(145deg, #fafbfc, #ffffff);
            border-radius: 14px;
            border: 1px solid #eef2f6;
            transition: all 0.25s;
        }
        .fb-flow-step:hover {
            border-color: #4a6cf7;
            box-shadow: 0 6px 20px rgba(74, 108, 247, 0.06);
        }
        .fb-flow-step .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: linear-gradient(135deg, #4a6cf7, #7c3aed);
            color: #fff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 10px;
            box-shadow: 0 4px 12px rgba(74, 108, 247, 0.25);
        }
        .fb-flow-step strong {
            display: block;
            font-size: 14px;
            color: #1a202c;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .fb-flow-step span {
            display: block;
            font-size: 12.5px;
            color: #718096;
            line-height: 1.5;
        }

        /* ============================================================
           FAQ
           ============================================================ */
        .fb-faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .fb-faq-item {
            padding: 16px 20px;
            background: #f8fafc;
            border-radius: 12px;
            border: 1px solid #eef2f6;
            transition: all 0.2s;
        }
        .fb-faq-item:hover {
            border-color: #d0d9f0;
            background: #f0f5ff;
        }
        .fb-faq-item .q {
            font-size: 14px;
            font-weight: 600;
            color: #1a202c;
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .fb-faq-item .q i { color: #4a6cf7; font-size: 15px; }
        .fb-faq-item .a {
            font-size: 13.5px;
            color: #4a5568;
            line-height: 1.7;
            padding-left: 21px;
        }

        /* ============================================================
           联系方式
           ============================================================ */
        .fb-contact {
            background: linear-gradient(135deg, #f0f5ff, #e8edfc);
            border-radius: 16px;
            padding: 28px 32px;
            border-left: 4px solid #4a6cf7;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }
        .fb-contact-left h3 {
            font-size: 18px;
            font-weight: 700;
            color: #1a202c;
            margin: 0 0 6px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .fb-contact-left h3 i { color: #4a6cf7; }
        .fb-contact-left p {
            font-size: 13.5px;
            color: #4a5568;
            margin: 0;
            line-height: 1.6;
        }
        .fb-contact-right {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .fb-contact-btn {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 11px 24px;
            border-radius: 10px;
            text-decoration: none;
            font-size: 14px;
            font-weight: 600;
            transition: all 0.25s;
            white-space: nowrap;
        }
        .fb-contact-btn.primary {
            background: #4a6cf7;
            color: #fff;
            box-shadow: 0 2px 8px rgba(74, 108, 247, 0.2);
        }
        .fb-contact-btn.primary:hover {
            background: #3a5cd9;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(74, 108, 247, 0.3);
            color: #fff;
        }
        .fb-contact-btn.outline {
            background: #ffffff;
            color: #4a5568;
            border: 1px solid #e2e8f0;
        }
        .fb-contact-btn.outline:hover {
            border-color: #4a6cf7;
            color: #4a6cf7;
            transform: translateY(-2px);
        }

        /* ============================================================
           深色模式
           ============================================================ */
        body.dark-mode .fb-hero,
        body.dark-mode .fb-card {
            background: #16213e;
            border-color: #2a3a5a;
        }
        body.dark-mode .fb-hero h1,
        body.dark-mode .fb-card-title,
        body.dark-mode .fb-type-item strong,
        body.dark-mode .fb-form-group label,
        body.dark-mode .fb-flow-step strong,
        body.dark-mode .fb-faq-item .q,
        body.dark-mode .fb-contact-left h3 {
            color: #e2e8f0;
        }
        body.dark-mode .fb-hero p,
        body.dark-mode .fb-type-item p,
        body.dark-mode .fb-flow-step span,
        body.dark-mode .fb-faq-item .a,
        body.dark-mode .fb-contact-left p {
            color: #a0aec0;
        }
        body.dark-mode .fb-hero-icon {
            background: linear-gradient(135deg, #1e2a4a, #2a3a5a);
            border-color: #3a4a6a;
            color: #6a8cff;
        }
        body.dark-mode .fb-hero-tag {
            background: #1a2a4a;
            color: #a0aec0;
            border-color: #2a3a5a;
        }
        body.dark-mode .fb-hero-tag i { color: #6a8cff; }
        body.dark-mode .fb-hero-tag:hover {
            border-color: #4a6cf7;
            color: #6a8cff;
            background: #1e2a4a;
        }
        body.dark-mode .fb-card-title {
            border-bottom-color: #2a3a5a;
        }
        body.dark-mode .fb-type-item {
            background: linear-gradient(145deg, #1a2a4a, #16213e);
            border-color: #2a3a5a;
        }
        body.dark-mode .fb-type-item:hover {
            border-color: #4a6cf7;
        }
        body.dark-mode .fb-input,
        body.dark-mode .fb-textarea {
            background: #1a2a4a;
            border-color: #2a3a5a;
            color: #cbd5e0;
        }
        body.dark-mode .fb-input:focus,
        body.dark-mode .fb-textarea:focus {
            border-color: #4a6cf7;
            background: #1e2a4a;
        }
        body.dark-mode .fb-type-btn {
            background: #1a2a4a;
            border-color: #2a3a5a;
            color: #a0aec0;
        }
        body.dark-mode .fb-type-btn:hover,
        body.dark-mode .fb-type-btn.active {
            border-color: #4a6cf7;
            background: #1e2a4a;
            color: #6a8cff;
        }
        body.dark-mode .fb-flow-step {
            background: linear-gradient(145deg, #1a2a4a, #16213e);
            border-color: #2a3a5a;
        }
        body.dark-mode .fb-faq-item {
            background: #1a2a4a;
            border-color: #2a3a5a;
        }
        body.dark-mode .fb-faq-item:hover {
            border-color: #4a6cf7;
            background: #1e2a4a;
        }
        body.dark-mode .fb-contact {
            background: linear-gradient(135deg, #1a2a4a, #1e2a4a);
            border-left-color: #6a8cff;
        }
        body.dark-mode .fb-contact-btn.outline {
            background: #1e2a4a;
            color: #a0aec0;
            border-color: #2a3a5a;
        }
        body.dark-mode .fb-success {
            background: linear-gradient(145deg, #1a3a2a, #16213e);
            border-color: #2f855a;
        }
        body.dark-mode .fb-success h3 { color: #9ae6b4; }
        body.dark-mode .fb-success p { color: #68d391; }

        /* ============================================================
           手机端
           ============================================================ */
        @media (max-width: 768px) {
            .fb-hero {
                padding: 26px 20px;
                border-radius: 16px;
            }
            .fb-hero h1 { font-size: 22px; }
            .fb-hero p { font-size: 13.5px; }
            .fb-hero-icon {
                width: 54px;
                height: 54px;
                font-size: 24px;
            }
            .fb-hero-tag { font-size: 11px; padding: 4px 11px; }

            .fb-card {
                padding: 18px 16px;
                border-radius: 14px;
            }
            .fb-card-title {
                font-size: 16px;
                margin-bottom: 16px;
            }
            .fb-types { gap: 10px; }
            .fb-type-item { padding: 16px 14px; }

            .fb-submit-btn {
                width: 100%;
                justify-content: center;
                padding: 13px 20px;
                font-size: 15px;
            }

            .fb-contact {
                padding: 22px 20px;
                flex-direction: column;
                align-items: stretch;
            }
            .fb-contact-right { width: 100%; }
            .fb-contact-btn { flex: 1; justify-content: center; }
        }
        @media (max-width: 768px) {
    /* 手机端：隐藏整个 navbar 行 */
    .header-banner .dh-navbar {
        display: none !important;
    }
    /* 让 .header-banner 不再留底部空白 */
    .header-banner {
        padding-bottom: 0 !important;
    }
}