/* 裁音魔方 · 页面样式（自 pages/pitch-shift.html 抽取，修改后请同步对应页面） */
        :root {
            --primary: #4CAF50;
            --primary-light: #81C784;
            --primary-dark: #388E3C;
            --accent: #CDDC39;
            --dark-bg: #121212;
            --darker-bg: #0A0A0A;
            --card-bg: #1E1E1E;
            --card-border: #333333;
            --text-primary: #FFFFFF;
            --text-secondary: #B0B0B0;
            --text-muted: #6A6A6A;
            --gradient: linear-gradient(135deg, #4CAF50, #2E7D32);
            --success: #4CAF50;
            --warning: #FF9800;
            --error: #F44336;
            --radius: 12px;
            --shadow: 0 8px 30px rgba(0,0,0,0.3);
            --shadow-hover: 0 12px 40px rgba(76,175,80,0.15);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Poppins', 'Segoe UI', sans-serif; }
        body { background-color: var(--darker-bg); color: var(--text-primary); line-height: 1.6; }
        /* 与全站 index.css 的 .container 保持一致（1200px），避免本页内容区比其它页面窄而显得整体缩小 */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

        /* ===== 导航（与全站 index.css 的导航样式保持一致） ===== */
        .navbar {
            position: fixed;
            top: 0;
            width: 100%;
            background-color: rgba(10, 10, 10, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            padding: 20px 0;
            border-bottom: 1px solid rgba(76, 175, 80, 0.1);
            transition: all 0.3s ease;
        }
        .navbar.scrolled { padding: 15px 0; background-color: rgba(10, 10, 10, 0.98); }
        .nav-container { display: flex; justify-content: space-between; align-items: center; }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            font-weight: 700;
            color: var(--primary);
            text-decoration: none;
            position: relative;
        }
        .logo i { font-size: 28px; }
        .logo span { color: white; }
        /* LOGO 不需要下划线 */
        .logo::after { display: none; }

        .nav-links { display: flex; gap: 30px; }
        .nav-links a {
            color: var(--text-primary);
            font-weight: 500;
            font-size: 16px;
            transition: color 0.3s;
            text-decoration: none;
            position: relative;
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--primary);
            transition: width 0.3s;
        }
        .nav-links a:hover { color: var(--primary); }
        .nav-links a:hover::after { width: 100%; }

        .mobile-menu-btn { display: none; background: none; border: none; color: white; font-size: 24px; cursor: pointer; }
        .nav-buttons { display: flex; gap: 15px; align-items: center; }
        /* 导航栏按钮与全站 index.css 的 .btn 尺寸一致（页面内其它按钮不受影响） */
        .nav-buttons .btn { padding: 12px 28px; font-size: 16px; }

        /* ===== 按钮 ===== */
        .btn {
            padding: 10px 24px;
            border-radius: 8px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            border: none;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            position: relative;
            overflow: hidden;
        }
        .btn:active { transform: scale(0.96); }
        .btn-primary { background: var(--gradient); color: white; box-shadow: 0 4px 16px rgba(76,175,80,0.25); }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(76,175,80,0.35); }
        .btn-secondary { background: transparent; color: var(--text-primary); border: 1px solid var(--card-border); }
        .btn-secondary:hover { border-color: var(--primary); color: var(--primary); background: rgba(76,175,80,0.05); }
        .btn-success { background: var(--success); color: white; box-shadow: 0 4px 16px rgba(76,175,80,0.2); }
        .btn-success:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(76,175,80,0.3); }
        .btn-success:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }
        .btn-warning { background: var(--warning); color: #1a1a1a; box-shadow: 0 4px 16px rgba(255,152,0,0.2); }
        .btn-warning:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(255,152,0,0.3); }
        .btn-warning:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }
        .btn-lg { padding: 14px 44px; font-size: 16px; }
        .btn-sm { padding: 6px 14px; font-size: 13px; }
        .btn-block { width: 100%; justify-content: center; }

        /* ===== 英雄区 ===== */
        .hero {
            padding: 120px 0 70px;
            background: linear-gradient(180deg, var(--darker-bg), rgba(18,18,18,0.95));
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 60%;
            height: 80%;
            background: radial-gradient(ellipse, rgba(76,175,80,0.04), transparent 70%);
            pointer-events: none;
        }
        .hero-content {
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .hero-text h1 {
            font-size: 40px;
            font-weight: 700;
            line-height: 1.15;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 14px;
        }
        .hero-text p {
            font-size: 17px;
            color: var(--text-secondary);
            margin-bottom: 22px;
            max-width: 90%;
            margin-left: auto;
            margin-right: auto;
        }
        /* ===== Section ===== */
        .section { padding: 50px 0; }
        .section-title { text-align: center; margin-bottom: 35px; }
        .section-title h2 { font-size: 30px; font-weight: 700; margin-bottom: 8px; }
        .section-title h2 i { color: var(--primary); margin-right: 10px; }
        .section-title p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; font-size: 16px; }

        .features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px,1fr)); gap: 20px; }
        .feature-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px 20px;
            border: 1px solid var(--card-border);
            text-align: center;
            transition: all 0.3s;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            background: rgba(76,175,80,0.1);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 14px;
            font-size: 24px;
            color: var(--primary);
            transition: all 0.3s;
        }
        .feature-card:hover .feature-icon { background: var(--gradient); color: white; }
        .feature-card h3 { font-size: 18px; margin-bottom: 6px; }
        .feature-card p { color: var(--text-secondary); font-size: 14px; }

        /* ===== 上传区 ===== */
        .upload-section {
            background: var(--dark-bg);
            border-radius: var(--radius);
            padding: 40px 36px;
            border: 2px dashed var(--card-border);
            transition: all 0.3s;
            text-align: center;
        }
        .upload-section:hover {
            border-color: var(--primary);
            background: rgba(76,175,80,0.05);
        }
        .upload-section.dragover {
            border-color: var(--primary);
            background: rgba(76,175,80,0.05);
            box-shadow: inset 0 0 30px rgba(76,175,80,0.05);
        }
        .upload-icon {
            font-size: 64px;
            color: var(--primary);
            margin-bottom: 20px;
            transition: all 0.3s;
        }
        .upload-section.dragover .upload-icon { transform: scale(1.05); }
        .upload-text h3 { font-size: 20px; margin-bottom: 4px; }
        .upload-text p { color: var(--text-secondary); margin-bottom: 18px; font-size: 15px; }

        .upload-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
        .file-input-hidden { display: none; }

        .file-info-display {
            background: rgba(0,0,0,0.2);
            border-radius: 8px;
            padding: 12px 18px;
            margin: 16px 0 0;
            display: none;
            align-items: center;
            justify-content: space-between;
            border: 1px solid var(--card-border);
        }
        .file-info-display.active { display: flex; animation: fadeSlideIn 0.3s ease; }
        @keyframes fadeSlideIn {
            from { opacity: 0; transform: translateY(-8px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .file-info-display .file-name { font-weight: 500; font-size: 15px; }
        .file-info-display .file-size { color: var(--text-secondary); font-size: 14px; }
        .file-info-display .remove-file { color: var(--error); cursor: pointer; font-size: 18px; transition: color 0.3s; padding: 4px; }
        .file-info-display .remove-file:hover { color: #ff6b6b; }

        .status-hint {
            margin-top: 14px;
            padding: 10px 16px;
            border-radius: 8px;
            font-size: 14px;
            display: none;
            align-items: center;
            gap: 10px;
        }
        .status-hint.active { display: flex; animation: fadeSlideIn 0.3s ease; }
        .status-hint.info { background: rgba(76,175,80,0.06); color: var(--primary); border: 1px solid rgba(76,175,80,0.15); }
        .status-hint.success { background: rgba(76,175,80,0.06); color: var(--success); border: 1px solid rgba(76,175,80,0.15); }
        .status-hint.warning { background: rgba(255,152,0,0.06); color: var(--warning); border: 1px solid rgba(255,152,0,0.15); }

        /* ===== 参数面板 ===== */
        .params-section { margin-top: 28px; padding-top: 28px; border-top: 1px solid var(--card-border); }
        .params-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
        .param-card {
            background: rgba(0,0,0,0.15);
            border-radius: var(--radius);
            padding: 18px 20px;
            border: 1px solid var(--card-border);
            text-align: left;
            transition: border-color 0.3s;
        }
        .param-card:hover { border-color: rgba(76,175,80,0.3); }
        .param-card .param-title {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }
        .param-card .param-title i { color: var(--primary); font-size: 16px; }

        /* 移调（主滑块 + 数字框） */
        .pitch-control-group {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 15px;
            padding-bottom: 15px;
            border-bottom: 1px dashed var(--card-border);
        }
        .pitch-slider {
            flex: 1;
            accent-color: var(--primary);
            background: var(--card-border);
            height: 3px;
            border-radius: 3px;
            -webkit-appearance: none;
            appearance: none;
            cursor: pointer;
        }
        .pitch-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--gradient);
            cursor: pointer;
            box-shadow: 0 2px 8px rgba(76,175,80,0.3);
        }
        .pitch-number-box {
            width: 70px;
            padding: 6px 8px;
            background: rgba(0,0,0,0.3);
            border: 1px solid var(--card-border);
            border-radius: 6px;
            color: var(--text-primary);
            text-align: center;
            font-size: 14px;
            font-weight: 600;
            outline: none;
            transition: border-color 0.3s;
        }
        .pitch-number-box:focus { border-color: var(--primary); }
        .pitch-unit-text { font-size: 13px; color: var(--text-secondary); min-width: 30px; }

        /* 精细微调（音分滑块，独立叠加） */
        .fine-tuning-row {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-top: 5px;
        }
        .fine-tuning-row label {
            font-size: 12px;
            color: var(--text-secondary);
            min-width: 60px;
        }
        .fine-tuning-row input[type="range"] {
            flex: 1;
            accent-color: var(--warning);
            -webkit-appearance: none;
            height: 3px;
            background: rgba(255,152,0,0.2);
            border-radius: 3px;
        }
        .fine-tuning-row input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 14px;
            height: 14px;
            border-radius: 50%;
            background: var(--warning);
            cursor: pointer;
        }
        .fine-tuning-row .fine-val {
            font-size: 14px;
            color: var(--warning);
            font-weight: 600;
            min-width: 60px;
            text-align: center;
            background: rgba(0,0,0,0.3);
            padding: 4px;
            border-radius: 4px;
        }

        .preset-grid {
            display: grid;
            grid-template-columns: repeat(11,1fr);
            gap: 4px;
        }
        .preset-btn {
            padding: 4px 0;
            border-radius: 4px;
            border: 1px solid var(--card-border);
            background: transparent;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all 0.2s;
            font-size: 12px;
            font-weight: 500;
            text-align: center;
        }
        .preset-btn:hover { border-color: var(--primary); color: var(--primary); background: rgba(76,175,80,0.05); }
        .preset-btn.active { border-color: var(--primary); background: rgba(76,175,80,0.1); color: var(--primary); }
        .preset-btn.zero { border-color: rgba(76,175,80,0.3); color: var(--primary); }

        .speed-control-group {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 10px;
        }
        .speed-control-group input[type="range"] {
            flex: 1;
            accent-color: var(--primary);
            background: var(--card-border);
            height: 3px;
            border-radius: 3px;
            -webkit-appearance: none;
            appearance: none;
        }
        .speed-control-group input[type="range"]::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 16px;
            height: 16px;
            border-radius: 50%;
            background: var(--gradient);
            cursor: pointer;
            box-shadow: 0 2px 8px rgba(76,175,80,0.3);
        }
        .speed-control-group .speed-val { font-weight: 600; color: var(--primary); min-width: 40px; text-align: center; font-size: 14px; }

        .speed-presets { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 10px; }
        .speed-preset-btn {
            padding: 3px 10px;
            border-radius: 4px;
            border: 1px solid var(--card-border);
            background: transparent;
            color: var(--text-secondary);
            cursor: pointer;
            transition: all 0.2s;
            font-size: 11px;
        }
        .speed-preset-btn:hover { border-color: var(--primary); color: var(--primary); background: rgba(76,175,80,0.05); }
        .speed-preset-btn.active { border-color: var(--primary); background: rgba(76,175,80,0.08); color: var(--primary); }

        /* ===== 处理按钮 ===== */
        .process-area { margin-top: 28px; padding-top: 28px; border-top: 1px solid var(--card-border); text-align: center; }
        .process-area .process-hint { color: var(--text-secondary); font-size: 13px; margin-top: 8px; }

        /* ===== 结果区 ===== */
        .result-section { display: none; margin-top: 35px; }
        .result-section.active { display: block; animation: fadeSlideIn 0.4s ease; }

        .result-header { text-align: center; margin-bottom: 24px; }
        .result-header h3 { font-size: 24px; color: var(--primary); display: flex; align-items: center; justify-content: center; gap: 10px; }
        .result-header p { color: var(--text-secondary); font-size: 16px; }

        /* ===== 波形播放器（首页同款：静态波形 + 进度线 + 点击跳转） ===== */
        .wave-player { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; padding: 12px 14px; background: rgba(0,0,0,0.25); border: 1px solid var(--card-border); border-radius: 10px; }
        .wave-play-btn { flex: 0 0 44px; width: 44px; height: 44px; border-radius: 50%; border: none; background: var(--primary); color: #06130a; font-size: 15px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: transform .15s ease, filter .15s ease; }
        .wave-play-btn:hover { filter: brightness(1.15); transform: scale(1.05); }
        .wave-main { flex: 1; min-width: 0; }
        .wave-canvas { width: 100%; height: 56px; display: block; cursor: pointer; }
        .wave-meta { display: flex; align-items: center; gap: 5px; margin-top: 6px; color: var(--text-secondary); font-size: 12px; font-variant-numeric: tabular-nums; }

/* ===== 音量控制（播放键旁） ===== */
        .volume-control { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
        .volume-icon { color: var(--text-secondary); font-size: 14px; cursor: pointer; width: 16px; text-align: center; transition: color .2s; }
        .volume-icon:hover { color: var(--primary); }
        .volume-slider { -webkit-appearance: none; appearance: none; width: 70px; height: 4px; border-radius: 2px; background: linear-gradient(to right, var(--primary) 0%, var(--primary) var(--vol-pct, 100%), rgba(255,255,255,0.15) var(--vol-pct, 100%), rgba(255,255,255,0.15) 100%); outline: none; cursor: pointer; margin: 0; }
        .volume-slider::-webkit-slider-thumb { -webkit-appearance: none; width: 12px; height: 12px; border-radius: 50%; background: var(--primary); border: none; cursor: pointer; }
        .volume-slider::-moz-range-thumb { width: 12px; height: 12px; border-radius: 50%; background: var(--primary); border: none; cursor: pointer; }
        .volume-step { width: 20px; height: 20px; border-radius: 50%; border: 1px solid var(--card-border); background: transparent; color: var(--text-secondary); font-size: 10px; cursor: pointer; display: flex; align-items: center; justify-content: center; padding: 0; transition: all .2s; flex-shrink: 0; }
        .volume-step:hover { border-color: var(--primary); color: var(--primary); }
        .wave-lock { margin-left: auto; color: var(--warning); }
        .wave-player.no-limit .wave-lock { display: none; }

        .result-summary {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 20px;
            background: rgba(76,175,80,0.04);
            border-radius: 8px;
            border-left: 3px solid var(--primary);
            margin-bottom: 24px;
        }
        .result-summary .count { font-size: 16px; color: var(--primary); font-weight: 600; display: flex; align-items: center; gap: 8px; }
        .result-summary .time { font-size: 14px; color: var(--text-secondary); display: flex; align-items: center; gap: 6px; }

        .result-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 24px 28px;
            border: 1px solid var(--card-border);
            transition: all 0.3s;
        }
        .result-card:hover { border-color: rgba(76,175,80,0.3); transform: translateY(-2px); }
        .result-card .track-title {
            font-weight: 600;
            margin-bottom: 14px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 18px;
            color: var(--primary);
        }
        .result-card .track-title .badge {
            font-size: 11px;
            padding: 2px 12px;
            border-radius: 20px;
            font-weight: 600;
        }
        .result-card .track-title .badge.trial { background: rgba(255,152,0,0.15); color: var(--warning); }
        .result-card .track-title .badge.unlocked { background: rgba(76,175,80,0.15); color: var(--success); }
        .result-card audio {
            width: 100%;
            border-radius: 6px;
            margin-bottom: 14px;
            background: rgba(0,0,0,0.2);
        }
        .result-card .info-row {
            display: flex;
            justify-content: center;
            gap: 30px;
            margin-bottom: 16px;
            padding: 10px;
            background: rgba(0,0,0,0.15);
            border-radius: 6px;
            flex-wrap: wrap;
        }
        .result-card .info-row span { font-size: 14px; color: var(--text-secondary); }
        .result-card .info-row strong { color: var(--primary); }

        .result-card .action-row {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            justify-content: center;
            margin-top: 6px;
        }
        .result-card .action-row .btn { flex: 1; min-width: 120px; justify-content: center; }
        .result-card .action-row .btn-main { flex: 2; min-width: 180px; justify-content: center; }

        .result-card .status-text {
            text-align: center;
            font-size: 13px;
            color: var(--text-secondary);
            margin-top: 12px;
            padding-top: 12px;
            border-top: 1px solid var(--card-border);
        }
        .result-card .status-text .highlight { color: var(--warning); font-weight: 600; }
        .result-card .file-label { display: block; text-align: center; font-size: 12px; color: var(--text-muted); margin-top: 12px; }

        /* ===== 点数确认弹窗 ===== */
        #pointConfirmOverlay {
            display: none;
            position: fixed;
            top: 0; left: 0;
            width: 100%; height: 100%;
            background: rgba(0,0,0,0.8);
            backdrop-filter: blur(8px);
            z-index: 3000;
            align-items: center;
            justify-content: center;
        }
        #pointConfirmOverlay.active { display: flex; }
        #pointConfirmOverlay .pay-box {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 32px 30px;
            max-width: 400px;
            width: 90%;
            border: 1px solid var(--card-border);
            text-align: center;
            position: relative;
        }
        #pointConfirmOverlay .pay-icon { font-size: 48px; color: var(--primary); margin-bottom: 12px; }
        #pointConfirmOverlay h3 { margin-bottom: 4px; }

        /* 通用动画关键帧 */
        @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
        @keyframes scaleIn { from { transform: scale(0.95); opacity: 0; } to { transform: scale(1); opacity: 1; } }

        /* ===== 处理遮罩 ===== */
        .processing-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.85);
            backdrop-filter: blur(8px);
            display: none;
            justify-content: center;
            align-items: center;
            z-index: 2000;
        }
        .processing-overlay.active { display: flex; animation: fadeIn 0.3s ease; }

        .processing-content {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 35px 30px;
            text-align: center;
            max-width: 420px;
            width: 90%;
            border: 1px solid var(--card-border);
            position: relative;
            animation: scaleIn 0.3s ease;
        }

        .progress-ring { position: relative; width: 100px; height: 100px; margin: 0 auto 18px; }
        .progress-ring svg { transform: rotate(-90deg); width: 100px; height: 100px; }
        .progress-ring .bg-circle { fill: none; stroke: var(--card-border); stroke-width: 4; }
        .progress-ring .progress-circle { fill: none; stroke: url(#grad); stroke-width: 4; stroke-linecap: round; transition: stroke-dashoffset 0.5s; }
        .progress-ring .progress-text { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); font-size: 22px; font-weight: 700; color: var(--primary); }

        .processing-content h3 { margin-bottom: 4px; }
        .processing-content .sub { color: var(--text-secondary); font-size: 14px; margin-bottom: 18px; }

        .processing-steps { text-align: left; padding-top: 16px; border-top: 1px solid var(--card-border); }
        .processing-step {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 5px 0;
            color: var(--text-secondary);
            font-size: 14px;
            transition: color 0.3s;
        }
        .processing-step .status-icon { width: 20px; text-align: center; }
        .processing-step.active { color: var(--primary); }
        .processing-step.done { color: var(--success); }

        /* ===== 模态框 ===== */
        .modal-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0,0,0,0.7);
            backdrop-filter: blur(6px);
            z-index: 3000;
            align-items: center;
            justify-content: center;
        }
        .modal-overlay.active { display: flex; animation: fadeIn 0.25s ease; }

        .modal-box {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 30px 28px;
            max-width: 380px;
            width: 90%;
            text-align: center;
            border: 1px solid var(--card-border);
            position: relative;
            animation: scaleIn 0.25s ease;
        }
        .modal-box .modal-close {
            position: absolute;
            top: 10px;
            right: 14px;
            font-size: 20px;
            background: none;
            border: none;
            color: var(--text-secondary);
            cursor: pointer;
            transition: color 0.3s;
        }
        .modal-box .modal-close:hover { color: var(--text-primary); }
        .modal-box .modal-icon { font-size: 40px; color: var(--primary); margin-bottom: 12px; }
        .modal-box h3 { margin-bottom: 6px; }
        .modal-box p { color: var(--text-secondary); margin-bottom: 16px; font-size: 15px; }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--dark-bg);
            padding: 40px 0 20px;
            margin-top: 60px;
            border-top: 1px solid var(--card-border);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit,minmax(150px,1fr));
            gap: 25px;
            margin-bottom: 30px;
        }
        .footer-column h3 { font-size: 16px; margin-bottom: 14px; color: var(--primary); }
        .footer-links { list-style: none; }
        .footer-links li { margin-bottom: 6px; }
        .footer-links a { color: var(--text-secondary); font-size: 14px; transition: color 0.3s; text-decoration: none; }
        .footer-links a:hover { color: var(--primary); }
        .copyright { text-align: center; padding-top: 20px; border-top: 1px solid var(--card-border); color: var(--text-secondary); font-size: 13px; }
        .beian-link { color: var(--text-secondary); text-decoration: none; margin-left: 8px; }
        .beian-link:hover { color: var(--primary); }

        /* ===== 移动菜单 ===== */
        .mobile-menu {
            position: fixed;
            top: 62px;
            left: 0;
            width: 100%;
            background: var(--darker-bg);
            padding: 20px;
            border-top: 1px solid var(--card-border);
            transform: translateY(-120%);
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s;
            z-index: 999;
        }
        .mobile-menu.active { transform: translateY(0); opacity: 1; visibility: visible; }
        .mobile-nav-links { display: flex; flex-direction: column; gap: 12px; margin-bottom: 18px; }
        .mobile-nav-links a { font-size: 17px; padding: 8px 0; border-bottom: 1px solid var(--card-border); text-decoration: none; color: var(--text-secondary); }
        .mobile-buttons { display: flex; flex-direction: column; gap: 10px; }

        /* ===== 响应式 ===== */
        @media (max-width: 992px) {
            .hero-text p { max-width: 100%; }
            .params-grid { grid-template-columns: 1fr; }
            .preset-grid { grid-template-columns: repeat(11,1fr); }
            .result-card { max-width: 100%; }
        }
        @media (max-width: 768px) {
            .nav-links, .nav-buttons { display: none; }
            .mobile-menu-btn { display: block; }
            .hero-text h1 { font-size: 30px; }
            .hero { padding: 100px 0 40px; }
            .section { padding: 40px 0; }
            .section-title h2 { font-size: 24px; }
            .upload-section { padding: 24px 16px; }
            .result-summary { flex-direction: column; gap: 8px; text-align: center; }
            .batch-buttons { flex-direction: column; }
            .batch-buttons .btn { width: 100%; justify-content: center; }
            .preset-grid { grid-template-columns: repeat(11,1fr); gap: 3px; }
            .preset-btn { font-size: 11px; padding: 3px 0; }
            .result-card .info-row { flex-direction: column; gap: 6px; align-items: center; }
            .result-card .action-row .btn { min-width: 100%; }
            .result-card .action-row .btn-main { min-width: 100%; }
        }
        @media (max-width: 576px) {
            .hero-text h1 { font-size: 24px; }
            .param-card { padding: 14px; }
            .preset-grid { grid-template-columns: repeat(11,1fr); gap: 2px; }
            .preset-btn { font-size: 10px; padding: 2px 0; }
            .process-area .btn { width: 100%; justify-content: center; }
            .file-info-display { flex-wrap: wrap; gap: 6px; justify-content: center; }
            .progress-ring { width: 70px; height: 70px; }
            .progress-ring svg { width: 70px; height: 70px; }
            .progress-ring .progress-text { font-size: 16px; }
        }