/* ========== 1. 本地字体声明 ========== */
        /* 声明LESLIE字体：用于倒计时数字展示，突出科技感 */
        @font-face {
            font-family: 'LESLIE';
            src: url('{pboot:sitepath}/theme/upgrade/fonts/LESLIE.woff2') format('woff2');
            font-weight: normal;
            font-style: normal;
            font-display: swap;
        }

        /* 声明方正品尚中黑简体：作为全局默认字体，保证中文显示质感 */
        @font-face {
            font-family: '方正品尚中黑简体';
            src: url('{pboot:sitepath}/theme/upgrade/fonts/方正品尚中黑简体.woff2') format('woff2');
            font-weight: normal;
            font-style: normal;
            font-display: swap;
        }

        /* 重置 & 基础 —— 宇宙级优雅 + 本地字体主导 */
        html, body {
            margin: 0;
            padding: 0;
            width: 100%;
            height: 100%;
            overflow: hidden;
            /* 全局默认字体：方正品尚中黑简体，后备 sans-serif */
            font-family: '方正品尚中黑简体', 'Rajdhani', 'Orbitron', sans-serif;
            color: white;
            background-color: #03050c;
        }

        /* 宇宙背景层：作为页面底层视觉元素，不干扰交互 */
        #cosmic-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
            display: block;
            pointer-events: none;
        }

        /* 升级页面核心容器：居中展示所有内容，毛玻璃效果增强宇宙质感 */
        .upgrade-container {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            z-index: 20;
            padding: 1.5rem;
            box-sizing: border-box;
            text-align: center;
            backdrop-filter: blur(2px);
        }

        /* 主标题样式：渐变文字+脉冲阴影动画，突出视觉焦点 */
        h1 {
            font-size: clamp(2.8rem, 15vw, 6rem);
            font-weight: 600;
            margin: 0 0 0.2rem 0;
            letter-spacing: 6px;
            text-transform: uppercase;
            background: linear-gradient(135deg, #ffe6b0, #c59cf2, #7fd9ff, #ff9a9e);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-shadow: 0 0 20px #9f7aff, 0 0 40px #3f6aff, 0 0 60px #9f4eff;
            animation: titlePulse 4s infinite alternate ease-in-out;
            /* 继承方正品尚中黑简体字体 */
        }
        /* 标题脉冲动画：阴影颜色+透明度交替变化，模拟呼吸效果 */
        @keyframes titlePulse {
            0% { text-shadow: 0 0 1px #9f7aff, 0 0 40px #3f6aff, 0 0 60px #9f4eff; opacity: 0.95; }
            100% { text-shadow: 0 0 10px #ff7ae9, 0 0 60px #ff3b9b, 0 0 80px #ffd673; opacity: 1; }
        }

        /* 副标题样式：毛玻璃边框+渐变文字，弱化但不丢失视觉层次 */
        .sub {
            /* 移除原有的 font-family 强制，继承 body 的方正品尚中黑简体 */
            font-family: inherit;
            font-size: clamp(1.2rem, 4vw, 1.8rem);
            font-weight: 300;
            letter-spacing: 4px;
            margin-bottom: 2.5rem;
            color: #cfd9ff;
            text-shadow: 0 0 15px #4f8aff, 0 0 30px #2f4f9f;
            background: linear-gradient(135deg, #ffffffcc, #c1b3ffcc);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            backdrop-filter: blur(4px);
            padding: 0.5rem 2rem;
            border-radius: 60px;
            border: 1px solid rgba(255, 200, 255, 0.3);
            box-shadow: 0 0 50px rgba(180, 130, 255, 0.3);
        }

        /* 倒计时面板：核心容器，毛玻璃+多层阴影，营造宇宙悬浮感 */
        .countdown-panel {
            background: rgba(8, 5, 20, 0.3);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: 80px;
            padding: 2.5rem 3rem;
            box-shadow: 0 0 100px rgba(110, 0, 255, 0.5), 0 20px 40px rgba(0, 0, 0, 0.6), inset 0 0 40px rgba(255, 160, 255, 0.3);
            margin: 1.5rem 0 2rem;
            max-width: 1000px;
            width: fit-content;
            border-top: 1px solid rgba(255, 255, 255, 0.5);
            border-left: 1px solid rgba(255, 255, 255, 0.5);
        }

        /* 计时器容器：弹性布局，适配不同屏幕尺寸的时间块排列 */
        .timer {
            display: flex;
            flex-flow: row wrap;
            justify-content: center;
            align-items: center;
            gap: 1.8rem 2.5rem;
        }

        /* 单个时间单位（时/分/秒等）：独立胶囊块，悬浮交互效果 */
        .time-unit {
            display: flex;
            flex-direction: column;
            align-items: center;
            width: 150px;
            flex: 0 0 auto;
            box-sizing: border-box;
            background: rgba(0, 0, 0, 0.35);
            border-radius: 50px;
            padding: 1.8rem 1rem;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 180, 255, 0.3);
            box-shadow: 0 0 30px #9f4eff66, inset 0 0 20px #7f9fff33;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        /* 第一个时间单位特殊样式：加宽宽度，突出核心时间（如“天”） */
        .timer .time-unit:first-child {
            width: 200px;
        }

        /* 时间单位悬浮交互：缩放+强化阴影，提升交互反馈 */
        .time-unit:hover {
            transform: scale(1.05);
            box-shadow: 0 0 60px #d08aff, inset 0 0 30px #ffffff;
        }

        /* 倒计时数字：核心视觉元素，使用LESLIE字体突出科技感 */
        .time-unit .number {
            font-family: 'LESLIE', 'Courier New', monospace;
            font-size: clamp(3.5rem, 12vw, 6.2rem);
            font-weight: 900;
            line-height: 1;
            display: block;
            width: 100%;
            text-align: center;
            white-space: nowrap;
            color: #fffbf5;
            /* 移除所有文字阴影，使数字更清晰 (原样保留) */
            text-shadow: none;
            background: linear-gradient(135deg, #f4f0ff, #ffe2b0);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 0.25rem;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            text-rendering: optimizeLegibility;
        }

        /* 时间标签（时/分/秒等）：弱化但清晰，胶囊样式增强质感 */
        .time-unit .label {
            font-size: 1.1rem;
            font-weight: 400;
            letter-spacing: 3px;
            text-transform: uppercase;
            color: #d7d0ff;
            background: rgba(10, 5, 30, 0.5);
            padding: 0.3rem 1.2rem;
            border-radius: 30px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            backdrop-filter: blur(5px);
            box-shadow: inset 0 0 10px #b7aaff;
            white-space: nowrap;
            /* 继承方正品尚中黑简体 */
        }

        /* 公司及版权标语：金色光晕+毛玻璃，突出重要提示 */
        .cosmic-tagline {
            font-size: 1.3rem;
            margin-top: 2rem;
            padding: 0.8rem 2.5rem;
            background: rgba(0, 0, 0, 0.2);
            backdrop-filter: blur(8px);
            border-radius: 60px;
            border: 1px solid rgba(255, 215, 0, 0.4);
            box-shadow: 0 0 40px gold;
            color: #ffefb0;
            text-shadow: 0 0 10px #ffb347, 0 0 20px #ff69b4;
            font-weight: 500;
            letter-spacing: 2px;
            display: inline-block;
            /* 字体继承方正品尚中黑简体 */
        }

        /* 页脚备注：弱化显示，不干扰核心内容 */
        .footer-note {
            align-items: center;
            margin: 3rem 0 2rem;
            bottom: 20px;
            right: 30px;
            font-size: 0.9rem;
            color: rgba(250, 250, 250, 0.7);
            z-index: 25;
            backdrop-filter: blur(5px);
            padding: 0.3rem 1rem;
            border-radius: 40px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            /* 字体继承方正品尚中黑简体 */
        }

        .footer-note a {
            transition: all 0.2s ease; /* 为所有变化添加平滑过渡 */
        }

        .footer-note a:hover {
            color: #3efd04 !important; /* 文字变为亮白色 */
            transform: scale(1.04);     /* 整体放大1.05倍 */
        }

      /* ========== 响应式适配：700px以下屏幕（平板/大屏手机） ========== */
        @media (max-width: 700px) {
            .countdown-panel {
                padding: 1.8rem 1.5rem;
                border-radius: 50px;
            }
            .time-unit {
                width: 120px;
                padding: 1.5rem 0.8rem;
            }
            .timer .time-unit:first-child {
                width: 150px;
            }
            .time-unit .number {
                font-size: 3.2rem;
            }
            .time-unit .label {
                font-size: 0.9rem;
                letter-spacing: 2px;
            }
            .sub {
                font-size: 1rem;
            }
        }

        @media (max-width: 480px) {
            .timer {
                gap: 1rem;
            }
            .time-unit {
                width: 85px;
                padding: 1.2rem 0.5rem;
            }
            .timer .time-unit:first-child {
                width: 105px;
            }
            .time-unit .number {
                font-size: 2.5rem;
            }
            .time-unit .label {
                font-size: 0.7rem;
                padding: 0.2rem 0.5rem;
            }
            h1 {
                font-size: 2.5rem;
            }
        }

        /* ========== 全局交互优化：禁止文字选择 + 清除点击高亮 ========== */
        * {
            user-select: none;
            -webkit-tap-highlight-color: transparent;
        }