/* ===== 全局重置 ===== */
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: #f0f4f9;
            min-height: 100vh;
            padding: 16px 12px 32px;
            color: #0b1a2f;
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 16px;
            box-shadow: 0 4px 20px rgba(0,20,50,0.06), 0 1px 4px rgba(0,0,0,0.02);
            padding: 28px 28px 24px;
            border: 1px solid rgba(210,225,245,0.4);
            transition: all 0.2s;
        }
        @media (max-width: 640px) {
            body { padding: 10px 8px 20px; }
            .container { 
                padding: 18px 14px 16px; 
                border-radius: 12px;
                box-shadow: 0 2px 12px rgba(0,20,50,0.05);
            }
        }

        /* ===== 头部 ===== */
        header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 10px 16px;
            padding-bottom: 16px;
            border-bottom: 1.5px solid #eef3fc;
            margin-bottom: 20px;
        }
        .brand h1 {
            font-size: 1.4rem;
            font-weight: 700;
            color: #0b1a2f;
            letter-spacing: -0.02em;
        }
        .brand .sub {
            font-size: 0.8rem;
            color: #5e7a9c;
            margin-top: 1px;
        }
        @media (max-width: 480px) {
            .brand h1 { font-size: 1.2rem; }
            header { padding-bottom: 12px; margin-bottom: 16px; }
        }

        /* ===== 域名展示区 ===== */
        .domain-showcase {
            text-align: center;
            padding: 6px 16px 22px;
            background: #f6faff;
            border-radius: 12px;
            border: 1px solid #e5effa;
            margin-bottom: 20px;
        }
        @media (max-width: 640px) {
            .domain-showcase { padding: 18px 12px 16px; border-radius: 10px; }
        }
        .domain-name {
            font-size: clamp(2.2rem, 8vw, 3.8rem);
            font-weight: 800;
            letter-spacing: -0.03em;
            color: #0a1a30;
            word-break: break-word;
        }
        .domain-name .tld {
            color: #1f5aa7;
            background: linear-gradient(135deg, #1a4d8c, #3570b3);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .domain-note {
            font-size: 0.95rem;
            color: #1f3d62;
            max-width: 680px;
            margin: 12px auto 0;
            line-height: 1.7;
            background: white;
            padding: 12px 18px;
            border-radius: 10px;
            border: 1px solid #e2ebf9;
            text-align: left;
        }
        @media (max-width: 640px) {
            .domain-note { font-size: 0.88rem; padding: 10px 14px; border-radius: 8px; }
        }
        .domain-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 6px 12px;
            margin-top: 14px;
        }
        .domain-tags span {
            background: white;
            padding: 3px 16px;
            border-radius: 30px;
            font-size: 0.78rem;
            font-weight: 500;
            color: #1a4c8a;
            border: 1px solid #d2e2f8;
        }
        @media (max-width: 480px) {
            .domain-tags span { font-size: 0.72rem; padding: 2px 12px; }
        }

        /* ===== 行动按钮 ===== */
        .action-bar {
            display: flex;
            justify-content: center;
            margin: 16px 0 28px;
        }
        .btn-primary {
            background: #1a4c8a;
            color: #fff;
            border: none;
            padding: 11px 44px;
            border-radius: 12px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: 0.15s;
            box-shadow: 0 4px 14px rgba(26,76,138,0.18);
            border: 1px solid #1f5aa7;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            -webkit-tap-highlight-color: transparent;
        }
        .btn-primary:active { transform: scale(0.97); }
        .btn-primary:hover { background: #0f3d72; box-shadow: 0 6px 18px rgba(26,76,138,0.22); }
        @media (max-width: 640px) {
            .action-bar { margin: 12px 0 20px; }
            .btn-primary { 
                width: 100%;
                justify-content: center; 
                padding: 12px 20px; 
                font-size: 0.9rem;
                border-radius: 10px;
            }
        }

        /* ===== 其他域名 & 友情链接 ===== */
        .section-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: #0b1a2f;
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .section-title .line {
            flex: 1;
            height: 1.5px;
            background: #e3ebf7;
        }
        @media (max-width: 480px) {
            .section-title { font-size: 1rem; margin-bottom: 10px; }
        }

        .domain-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 12px;
        }
        .domain-grid a {
            display: inline-block;
            padding: 5px 18px;
            background: #f5faff;
            color: #1f4a7a;
            text-decoration: none;
            border-radius: 10px;
            border: 1px solid #d7e5f8;
            font-weight: 500;
            font-size: 0.85rem;
            transition: 0.1s;
            -webkit-tap-highlight-color: transparent;
        }
        .domain-grid a:active { transform: scale(0.96); }
        .domain-grid a:hover { background: #e8f1fe; border-color: #aec6e6; }
        @media (max-width: 480px) {
            .domain-grid a { 
                padding: 4px 14px; 
                font-size: 0.78rem; 
                border-radius: 8px;
            }
            .domain-grid { gap: 6px 10px; }
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 18px;
            margin-top: 2px;
        }
        .friend-links a {
            color: #1f4a7a;
            text-decoration: none;
            font-weight: 450;
            font-size: 0.85rem;
            padding: 2px 0;
            border-bottom: 2px solid transparent;
            transition: 0.15s;
            -webkit-tap-highlight-color: transparent;
        }
        .friend-links a:hover { border-bottom-color: #1f5aa7; color: #0b1a2f; }
        @media (max-width: 480px) {
            .friend-links { gap: 6px 14px; }
            .friend-links a { font-size: 0.8rem; }
        }

        /* ===== 页脚 ===== */
        footer {
            margin-top: 24px;
            padding-top: 16px;
            border-top: 1.5px solid #e9eff8;
            text-align: center;
            font-size: 0.78rem;
            color: #5e7a9c;
        }
        footer a { color: #1f5aa7; text-decoration: none; font-weight: 500; }
        footer a:hover { text-decoration: underline; }
        .footer-meta {
            display: flex;
            justify-content: center;
            gap: 14px;
            flex-wrap: wrap;
            margin-top: 4px;
        }
        @media (max-width: 480px) {
            footer { font-size: 0.72rem; margin-top: 18px; padding-top: 12px; }
            .footer-meta { gap: 8px; }
        }

        .section-gap { margin-top: 28px; }
        @media (max-width: 640px) { .section-gap { margin-top: 20px; } }

        /* ============================================================
           弹窗 (Modal) - 手机端适配优化
           ============================================================ */
        .modal-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(8, 24, 48, 0.5);
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
            align-items: center;
            justify-content: center;
            z-index: 1000;
            padding: 16px;
        }
        .modal-overlay.active {
            display: flex;
        }

        .modal {
            background: #ffffff;
            max-width: 520px;
            width: 100%;
            border-radius: 16px;
            padding: 28px 28px 24px;
            box-shadow: 0 32px 64px rgba(0, 10, 30, 0.25);
            border: 1px solid rgba(200, 218, 240, 0.3);
            animation: modalFade 0.25s ease;
            max-height: 90vh;
            overflow-y: auto;
        }
        @keyframes modalFade {
            0% { opacity: 0; transform: scale(0.96) translateY(12px); }
            100% { opacity: 1; transform: scale(1) translateY(0); }
        }

        @media (max-width: 640px) {
            .modal-overlay { padding: 12px; align-items: flex-start; padding-top: 20px; }
            .modal {
                padding: 20px 16px 16px;
                border-radius: 14px;
                max-height: 92vh;
                margin-top: 0;
            }
        }
        @media (max-width: 480px) {
            .modal-overlay { padding: 8px; padding-top: 16px; align-items: flex-start; }
            .modal {
                padding: 16px 14px 14px;
                border-radius: 12px;
                max-height: 94vh;
            }
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 18px;
        }
        .modal-header h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: #0b1a2f;
            letter-spacing: -0.02em;
        }
        .modal-close {
            background: none;
            border: none;
            font-size: 1.5rem;
            line-height: 1;
            color: #8a9fb8;
            cursor: pointer;
            padding: 0 6px;
            transition: 0.15s;
            -webkit-tap-highlight-color: transparent;
        }
        .modal-close:hover { color: #0b1a2f; transform: rotate(90deg); }
        .modal-close:active { transform: scale(0.9); }

        @media (max-width: 480px) {
            .modal-header { margin-bottom: 12px; }
            .modal-header h3 { font-size: 1.1rem; }
            .modal-close { font-size: 1.3rem; }
        }

        .form-group {
            margin-bottom: 14px;
        }
        .form-group label {
            display: block;
            font-size: 0.82rem;
            font-weight: 600;
            color: #1f3d62;
            margin-bottom: 4px;
            letter-spacing: 0.01em;
        }
        .form-group label .required {
            color: #d94a4a;
            margin-left: 2px;
        }
        .form-group input,
        .form-group textarea {
            width: 100%;
            padding: 9px 12px;
            border: 1.5px solid #dce6f2;
            border-radius: 8px;
            font-family: inherit;
            font-size: 0.92rem;
            color: #0b1a2f;
            background: #fafcff;
            transition: 0.15s;
            outline: none;
            -webkit-appearance: none;
        }
        .form-group input:focus,
        .form-group textarea:focus {
            border-color: #1f5aa7;
            box-shadow: 0 0 0 3px rgba(26, 76, 138, 0.08);
            background: #ffffff;
        }
        .form-group textarea {
            resize: vertical;
            min-height: 56px;
        }
        .form-group input[readonly] {
            background: #f0f5fd;
            color: #1f4a7a;
            font-weight: 500;
            cursor: default;
        }

        @media (max-width: 480px) {
            .form-group { margin-bottom: 10px; }
            .form-group label { font-size: 0.78rem; }
            .form-group input,
            .form-group textarea { 
                padding: 8px 10px; 
                font-size: 0.88rem;
                border-radius: 6px;
            }
            .form-group textarea { min-height: 44px; }
        }

        .btn-submit {
            width: 100%;
            background: #1a4c8a;
            color: white;
            border: none;
            padding: 12px;
            border-radius: 10px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: 0.15s;
            box-shadow: 0 4px 14px rgba(26, 76, 138, 0.15);
            border: 1px solid #1f5aa7;
            margin-top: 4px;
            letter-spacing: 0.02em;
            -webkit-tap-highlight-color: transparent;
            position: relative;
        }
        .btn-submit:active { transform: scale(0.97); }
        .btn-submit:hover { background: #0f3d72; box-shadow: 0 6px 18px rgba(26,76,138,0.2); }
        .btn-submit.loading {
            opacity: 0.7;
            cursor: not-allowed;
            pointer-events: none;
        }

        @media (max-width: 480px) {
            .btn-submit { padding: 10px; font-size: 0.9rem; border-radius: 8px; }
        }

        .form-hint {
            font-size: 0.75rem;
            color: #5e7a9c;
            margin-top: 12px;
            text-align: center;
            border-top: 1px solid #ecf2fa;
            padding-top: 12px;
        }

        @media (max-width: 480px) {
            .form-hint { font-size: 0.7rem; margin-top: 8px; padding-top: 8px; }
        }

        /* Toast 提示 */
        .toast {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0.9);
            background: rgba(0, 0, 0, 0.78);
            color: #fff;
            padding: 18px 28px;
            border-radius: 12px;
            font-size: 0.95rem;
            font-weight: 500;
            z-index: 2000;
            opacity: 0;
            pointer-events: none;
            transition: all 0.3s ease;
            text-align: center;
            max-width: 90%;
            backdrop-filter: blur(4px);
            -webkit-backdrop-filter: blur(4px);
        }
        .toast.show {
            opacity: 1;
            transform: translate(-50%, -50%) scale(1);
            pointer-events: auto;
        }
        .toast.success { background: rgba(26, 76, 138, 0.92); }
        .toast.error { background: rgba(200, 50, 50, 0.92); }
        .toast .toast-icon {
            display: block;
            font-size: 2rem;
            margin-bottom: 6px;
        }

        @media (max-width: 480px) {
            .toast { padding: 14px 20px; font-size: 0.88rem; border-radius: 10px; }
            .toast .toast-icon { font-size: 1.6rem; }
        }