/* =========================================
           3. Hero Section (垂直布局 - 极简风格)
           ========================================= */
        .hero-section {
            padding: 3rem 5% 2rem;
            min-height: calc(100vh - 5.5rem);
            display: flex;
            justify-content: center;
            align-items: flex-start;
            position: relative;
            background: radial-gradient(circle at 50% 20%, rgba(56, 189, 248, 0.08) 0%, rgba(15, 23, 42, 0) 60%);
        }

        .checker-card {
            width: 100%;
            max-width: 900px; /* 统一宽度控制：终端和结果都以此为准 */
            background: transparent;
            padding: 0;
            border: none;
            box-shadow: none;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .checker-card::before { display: none; }

        /* === 上部：控制面板 === */
        .panel-left {
            padding: 0 0 2.5rem 0;
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            z-index: 2;
        }

        .panel-left h1 {
            font-size: 3rem;
            font-weight: 800;
            margin-bottom: 1rem;
            background: var(--gradient-text);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            line-height: 1.2;
        }

        .panel-left p {
            color: var(--text-secondary);
            margin-bottom: 2.5rem;
            font-size: 1.1rem;
            max-width: 600px;
        }

        /* === 终端样式核心 (Terminal Style) === */
        .terminal-wrapper {
            width: 100%;
            max-width: 100%; /* ✅ 修改：填满 checker-card 的 900px */
            background: rgba(15, 23, 42, 0.95);
            border-radius: 10px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
            overflow: hidden;
            display: flex;
            flex-direction: column;
            text-align: left;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .terminal-wrapper:focus-within {
            border-color: rgba(56, 189, 248, 0.5);
            box-shadow: 0 20px 60px rgba(56, 189, 248, 0.15);
        }

        /* 终端顶部栏 */
        .terminal-top-bar {
            background: #1e293b;
            padding: 10px 15px;
            display: flex;
            align-items: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        .window-btns { display: flex; gap: 8px; margin-right: 15px; }
        .win-btn { width: 12px; height: 12px; border-radius: 50%; }
        .win-btn.red { background-color: #ff5f56; }
        .win-btn.yellow { background-color: #ffbd2e; }
        .win-btn.green { background-color: #27c93f; }

        .window-title {
            color: #94a3b8;
            font-family: 'Fira Code', monospace;
            font-size: 0.85rem;
            flex: 1;
            text-align: center;
            margin-right: 50px;
        }

        /* 终端内容区 */
        .terminal-body {
            padding: 25px; /* 增加一点内边距 */
            font-family: 'Fira Code', monospace;
            font-size: 1.15rem;
            min-height: 120px;
            cursor: text;
        }

        .cmd-line {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
        }

        .prompt {
            color: var(--code-success);
            margin-right: 12px;
            font-weight: 700;
            white-space: nowrap;
        }

        .prompt span { color: var(--accent-primary); }

        /* 隐形输入框 */
        input#domainInput {
            background: transparent;
            border: none;
            color: #fff;
            font-family: inherit;
            font-size: inherit;
            flex: 1;
            outline: none;
            min-width: 200px;
            padding: 0;
            margin: 0;
            caret-color: var(--accent-primary);
        }

        /* 历史输出行 */
        .history-line {
            color: var(--text-secondary);
            margin-bottom: 12px;
            font-size: 1rem;
            display: none;
        }
        .history-line.active { display: block; animation: fadeIn 0.3s ease; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(-5px); } to { opacity: 1; transform: translateY(0); } }

        .hint-text {
            margin-top: 15px;
            font-size: 0.85rem;
            color: var(--text-secondary);
            opacity: 0.6;
            font-family: 'Fira Code', monospace;
        }

        /* === 下部：结果显示面板 === */
        .panel-right {
            width: 100%;
            padding: 0;
            background: transparent;
            position: relative;
            min-height: 400px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .panel-right::before { display: none; }

        /* 雷达动画 */
        #idle-display {
            position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; z-index: 1; transition: opacity 0.5s ease;
        }
        .radar {
            width: 260px; height: 260px;
            border: 2px solid rgba(56, 189, 248, 0.15);
            border-radius: 50%; position: relative; margin-bottom: 2rem;
        }
        .radar::before { content: ''; position: absolute; top: 50%; left: 50%; width: 12px; height: 12px; background: var(--accent-primary); border-radius: 50%; transform: translate(-50%, -50%); box-shadow: 0 0 20px var(--accent-primary); }
        .radar::after { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; border-radius: 50%; background: conic-gradient(from 0deg, transparent 0deg, rgba(56, 189, 248, 0.1) 360deg); animation: radar-spin 2s linear infinite; }
        .radar-ring { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); border: 1px dashed rgba(56, 189, 248, 0.3); border-radius: 50%; animation: pulse-ring 3s infinite; }
        @keyframes radar-spin { 100% { transform: rotate(360deg); } }
        @keyframes pulse-ring { 0% { width: 50px; height: 50px; opacity: 1; } 100% { width: 260px; height: 260px; opacity: 0; } }
        .idle-text { color: var(--text-secondary); font-family: 'Fira Code', monospace; font-size: 0.95rem; letter-spacing: 4px; text-transform: uppercase; text-align: center; opacity: 0.7; }

        /* 结果显示容器 */
        #result-display { opacity: 0; pointer-events: none; transition: opacity 0.5s ease; position: relative; z-index: 2; display: none; height: 100%; width: 100%; }
        #result-display.active { opacity: 1; pointer-events: auto; display: flex; flex-direction: column; justify-content: flex-start; }

        /* 进度条 */
        .progress-container { height: 0; opacity: 0; overflow: hidden; transition: all 0.5s ease; margin-bottom: 0; width: 100%; max-width: 600px; margin: 0 auto; }
        .progress-container.active { height: auto; opacity: 1; margin-bottom: 2rem; }
        .scan-line { height: 6px; width: 100%; background: rgba(255,255,255,0.1); border-radius: 3px; position: relative; overflow: hidden; }
        .scan-fill { position: absolute; left: 0; top: 0; bottom: 0; width: 0%; background: var(--gradient-text); box-shadow: 0 0 15px var(--accent-primary); border-radius: 3px; transition: width 0.3s ease; }
        .scan-status-text { font-family: 'Fira Code', monospace; font-size: 0.9rem; color: var(--accent-primary); margin-top: 0.8rem; display: flex; justify-content: space-between; }

        /* 卡片布局 */
        .report-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
            margin-bottom: 2rem;
            width: 100%;
        }

        .report-card {
            background: rgba(15, 23, 42, 0.6);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 0.75rem;
            padding: 1.5rem;
            transition: transform 0.2s ease;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
        }
        .report-card:hover { border-color: rgba(56, 189, 248, 0.5); transform: translateY(-3px); box-shadow: 0 15px 40px rgba(0,0,0,0.3); }

        .card-header { display: flex; align-items: center; gap: 10px; margin-bottom: 1rem; padding-bottom: 0.8rem; border-bottom: 1px solid rgba(255, 255, 255, 0.05); color: var(--text-secondary); font-size: 0.85rem; text-transform: uppercase; letter-spacing: 1px; font-weight: 700; }
        .card-header svg { width: 16px; height: 16px; opacity: 0.9; }

        .data-row { display: flex; justify-content: space-between; margin-bottom: 0.8rem; font-size: 1rem; align-items: center; position: relative; }
        .data-row:last-child { margin-bottom: 0; }
        .data-label { color: var(--text-secondary); opacity: 0.7; flex-shrink: 0; font-size: 0.9rem; }

        .data-value {
            color: var(--text-main);
            font-family: 'Fira Code', monospace;
            font-weight: 600;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 180px;
            text-align: right;
            display: inline-block;
            cursor: default;
        }
        .data-value:hover {
            position: absolute; right: 0; top: -5px;
            width: auto; max-width: 300px; height: auto;
            white-space: normal; word-break: break-all; overflow: visible;
            background-color: #0f172a; border: 1px solid var(--accent-primary);
            box-shadow: 0 4px 15px rgba(0,0,0,0.5); border-radius: 4px; padding: 6px 12px; z-index: 999; text-align: left; line-height: 1.4;
        }

        .latency-good { color: var(--code-success); } .latency-ok { color: #facc15; } .latency-bad { color: var(--code-fail); }

        .result-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; padding-bottom: 1rem; border-bottom: 1px solid rgba(255,255,255,0.1); width: 100%; }
        .result-title { font-weight: 800; font-size: 1.8rem; display: flex; align-items: center; gap: 12px; }
        .result-title svg { width: 28px; height: 28px; }
        .badge-proto { background: rgba(56, 189, 248, 0.15); color: #38bdf8; padding: 4px 10px; border-radius: 4px; font-size: 0.9rem; border: 1px solid rgba(56, 189, 248, 0.2); font-weight: bold; }

        /* 终端 */
        .terminal-window {
            width: 100%;
            background: #0b1120; border-radius: 0.5rem; border: 1px solid rgba(255,255,255,0.1); padding: 1.5rem; font-family: 'Fira Code', monospace; font-size: 0.85rem; overflow-y: auto; position: relative; max-height: 250px;
        }
        .terminal-header { font-size: 0.75rem; color: #475569; margin-bottom: 0.8rem; display: flex; justify-content: space-between; text-transform: uppercase; }
        .log-line { margin-bottom: 5px; color: #94a3b8; line-height: 1.5; }
        .log-line::before { content: '>'; margin-right: 8px; color: #38bdf8; }
        .log-line.success { color: #34d399; } .log-line.error { color: #f87171; } .log-line.info { color: #818cf8; }

        /* =========================================
           4. 其他 Section 样式
           ========================================= */
        .features { padding: 5rem 10%; background-color: #0b1120; }
        .section-title { text-align: center; margin-bottom: 4rem; }
        .section-title h2 { font-size: 2.5rem; font-weight: 800; margin-bottom: 0.5rem; }
        .section-title p { color: var(--accent-secondary); font-size: 1.1rem; }

        .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2.5rem; }
        .card { background: var(--card-bg); padding: 3rem; border-radius: 1rem; box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2); border: 1px solid var(--code-border); transition: transform 0.3s ease; }
        .card:hover { transform: translateY(-5px); border-color: var(--accent-primary); }
        .features .icon { font-size: 3rem; margin-bottom: 1.5rem; display: inline-block; }
        .features h3 { color: var(--accent-primary); margin-bottom: 1rem; font-size: 1.4rem; }
        .features p { color: var(--text-secondary); font-size: 1rem; line-height: 1.7; }

        .tech-details { padding: 6rem 10%; display: flex; align-items: center; gap: 5rem; background-color: var(--bg-color); border-top: 1px solid var(--code-border); }
        .tech-text { flex: 1; }
        .tech-text h2 { font-size: 2.5rem; margin-bottom: 1.5rem; color: var(--accent-secondary); }
        .tech-text ul { list-style: none; margin-top: 2rem; }
        .tech-text li { position: relative; padding-left: 2rem; margin-bottom: 1rem; color: var(--text-main); font-size: 1.1rem; }
        .tech-text li::before { content: '✓'; color: var(--accent-primary); font-weight: bold; position: absolute; left: 0; top: 2px; }
        .tech-visual { flex: 1; background: rgba(15, 23, 42, 0.6); padding: 2.5rem; border-radius: 0.5rem; font-family: 'Fira Code', monospace; font-size: 1rem; border-left: 4px solid var(--accent-secondary); color: var(--text-secondary); line-height: 1.8; box-shadow: 0 20px 50px rgba(0,0,0,0.3); }
        .tech-visual .success { color: var(--code-success); }


        /* 移动端适配 */
        @media (max-width: 960px) {
            .hero-section { padding-top: 3rem; min-height: auto; }
            .checker-card { max-width: 100%; }
            .panel-left { padding: 0 0 2rem 0; }
            .panel-left h1 { font-size: 2.5rem; }
            .panel-right { min-height: auto; padding: 2rem 0; }
            .tech-details { flex-direction: column; gap: 3rem; }
            .report-grid { grid-template-columns: 1fr; }
        }