:root {
    color-scheme: light dark;

    /*
     * 毛玻璃面板与投影（项目视觉特色）
     * 保留半透明材质效果，不直接映射 M3 surface token
     */
    --panel-bg: rgba(255, 255, 255, 0.58);
    --surface-bg: rgba(255, 255, 255, 0.68);
    --surface-border: rgba(255, 255, 255, 0.48);
    --overlay-gradient:
        linear-gradient(135deg, rgba(238, 246, 255, 0.52), rgba(255, 247, 240, 0.42)),
        rgba(255, 255, 255, 0.26);

    /*
     * M3 Elevation Level 3 结构 + 品牌色微调
     * 标准 L3: 0 1px 3px rgba(0,0,0,0.3), 0 4px 8px 3px rgba(0,0,0,0.15)
     * 此处保留微弱的品牌蓝色调，但强度对齐 M3
     */
    --hero-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 4px 12px 2px rgba(58, 89, 127, 0.12);

    /*
     * M3 Shape Scale 对齐
     * Extra Large = 28px (--mdui-shape-corner-extra-large)
     * Large       = 16px (--mdui-shape-corner-large)
     */
    --radius-panel: var(--mdui-shape-corner-extra-large, 28px);
    --radius-section: 20px; /* 介于 Large(16px) 与 Extra Large(28px) 之间，嵌套卡片略小于外层 */

    /*
     * ——— M3 语义 Token 映射 ———
     * 通过引用 MDUI 主题变量，实现明暗主题自动切换
     * var(<token>, <fallback>) 的 fallback 保证了
     * 即使 MDUI 未加载完全，页面也有正确的初始颜色
     */
    --body-bg: var(--mdui-color-surface-container-low, rgb(233, 239, 245));
    --hero-title-color: var(--mdui-color-on-surface, rgb(15, 23, 42));
    --hero-description-color: var(--mdui-color-on-surface-variant, rgba(30, 41, 59, 0.78));
    --feature-title-muted: var(--mdui-color-on-surface-variant, rgba(15, 23, 42, 0.68));
    --footer-color: var(--mdui-color-on-surface-variant, rgba(15, 23, 42, 0.58));
    --item-divider: var(--mdui-color-outline-variant, rgba(148, 163, 184, 0.18));
}

html,
body {
    min-height: 100%;
    margin: 0;
}

body {
    display: grid;
    place-items: center;
    min-height: 100dvh;
    padding: 24px;
    box-sizing: border-box;
    font-family: "Noto Sans", "Noto Sans SC", sans-serif;
    overflow-x: hidden;
    background-color: var(--body-bg);
}

.page-background {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.page-background img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 20%;
    display: block;
}

.page-overlay {
    position: fixed;
    inset: 0;
    z-index: 1;
    background: var(--overlay-gradient);
    backdrop-filter: blur(1px);
    pointer-events: none;
}

.shell {
    position: relative;
    z-index: 2;
    width: min(1040px, 100%);
    display: grid;
    gap: 20px; /* M3 4dp 刻度 */
    align-content: center;
}

.hero {
    padding: 28px;
    border-radius: var(--radius-panel);
    background: var(--panel-bg);
    backdrop-filter: blur(14px);
    box-shadow: var(--hero-shadow);
}

.hero-copy {
    display: grid;
    gap: 12px;
    margin-bottom: 20px;
}

.hero-heading {
    display: grid;
    gap: 8px;
}

.hero-title {
    margin: 0;
    font-size: var(--mdui-typo-headline-small-size, 24px);
    font-weight: 700;
    line-height: var(--mdui-typo-headline-small-line-height, 32px);
    color: var(--hero-title-color);
}

.hero-description {
    margin: 0;
    max-width: 62ch;
    font-size: var(--mdui-typo-body-medium-size, 14px);
    font-weight: var(--mdui-typo-body-medium-weight, 400);
    line-height: var(--mdui-typo-body-medium-line-height, 20px);
    color: var(--hero-description-color);
}

.feature-list {
    overflow: hidden;
    border-radius: var(--radius-section);
    background: var(--surface-bg);
    border: 1px solid var(--surface-border);
    backdrop-filter: blur(10px);
}

.feature-item {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    align-items: center;
    gap: 16px; /* M3 4dp 刻度 */
    padding: 18px 20px;
}

.feature-item + .feature-item {
    border-top: 1px solid var(--item-divider);
}

.feature-title {
    display: grid;
    gap: 6px;
    min-width: 0;
}

.feature-title strong {
    font-size: var(--mdui-typo-title-medium-size, 16px);
    font-weight: 700;
    line-height: var(--mdui-typo-title-medium-line-height, 24px);
}

.feature-title span {
    color: var(--feature-title-muted);
    font-size: var(--mdui-typo-body-medium-size, 14px);
    font-weight: var(--mdui-typo-body-medium-weight, 400);
    line-height: var(--mdui-typo-body-medium-line-height, 20px);
}

.feature-status {
    justify-self: start;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px; /* M3 4dp 刻度 */
}

.actions mdui-button {
    flex: 1 1 220px;
}

.page-footer {
    justify-self: center;
    padding: 2px 12px 0;
    font-size: var(--mdui-typo-body-medium-size, 14px);
    font-weight: var(--mdui-typo-body-medium-weight, 400);
    line-height: var(--mdui-typo-body-medium-line-height, 20px);
    color: var(--footer-color);
    text-align: center;
}

/* ——————————————————————————————
 * 暗色主题
 * —————————————————————————————— */

@media (prefers-color-scheme: dark) {
    :root {
        /* 暗色毛玻璃背景 */
        --panel-bg: rgba(10, 18, 31, 0.72);
        --surface-bg: rgba(16, 27, 45, 0.78);
        --surface-border: rgba(125, 161, 206, 0.22);
        --overlay-gradient:
            linear-gradient(135deg, rgba(7, 23, 46, 0.5), rgba(7, 43, 79, 0.26)),
            rgba(3, 10, 18, 0.34);

        /*
         * 暗色 M3 Elevation：阴影更暗但更紧凑
         * M3 暗色下 elevation 主要通过 surface tone 提亮表达，
         * 阴影仅作为辅助，应比亮色主题更收敛
         */
        --hero-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 2px 8px 2px rgba(0, 0, 0, 0.28);

        /*
         * 文本色与边框色由 MDUI 的 M3 token 自动切换：
         * --body-bg          → var(--mdui-color-surface-container-low)
         * --hero-title-color → var(--mdui-color-on-surface)
         * --hero-description-color → var(--mdui-color-on-surface-variant)
         * --feature-title-muted    → var(--mdui-color-on-surface-variant)
         * --footer-color           → var(--mdui-color-on-surface-variant)
         * --item-divider           → var(--mdui-color-outline-variant)
         */
    }
}

/* ——————————————————————————————
 * 图标与内容布局
 * —————————————————————————————— */

.status-content,
.action-content {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.ui-icon {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
    display: inline-block;
    background-color: currentColor;
    mask-position: center;
    mask-repeat: no-repeat;
    mask-size: contain;
    -webkit-mask-position: center;
    -webkit-mask-repeat: no-repeat;
    -webkit-mask-size: contain;
}

.feature-status .ui-icon {
    width: 16px;
    height: 16px;
}

/* —— 状态图标 CSS class 驱动（替代 inline style）—— */

.status-icon-loading {
    mask-image: url('../icons/status-loading.svg');
    -webkit-mask-image: url('../icons/status-loading.svg');
}

.status-icon-ready {
    mask-image: url('../icons/status-ready.svg');
    -webkit-mask-image: url('../icons/status-ready.svg');
}

.status-icon-waiting {
    mask-image: url('../icons/status-update.svg');
    -webkit-mask-image: url('../icons/status-update.svg');
}

.status-icon-failed {
    mask-image: url('../icons/status-error.svg');
    -webkit-mask-image: url('../icons/status-error.svg');
}

/* ——————————————————————————————
 * 屏幕阅读器专用（视觉隐藏但可被读屏捕获）
 * —————————————————————————————— */

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 获取失败状态使用 M3 error 色，可点击查看详情 */
.feature-status.status-error {
    cursor: pointer;
}

.feature-status.status-error .status-content {
    color: var(--mdui-color-error);
}

/* ——————————————————————————————
 * 响应式：中等宽度
 * —————————————————————————————— */

@media (max-width: 880px) {
    body {
        padding: 18px;
    }

    .page-background img {
        object-position: 60% center;
    }

    .feature-item {
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .feature-status {
        grid-column: 1 / 2;
    }

    .feature-item mdui-switch,
    .feature-item mdui-checkbox {
        grid-column: 2 / 3;
        grid-row: 1 / 3;
    }
}

@media (max-width: 560px) {
    body {
        padding: 14px;
    }

    .page-background img {
        object-position: 64% center;
    }

    .hero {
        padding: 22px 18px;
        border-radius: 24px;
    }

    .feature-list {
        border-radius: 18px;
    }

    .actions mdui-button {
        flex-basis: 100%;
    }
}

/* ——————————————————————————————
 * prefers-reduced-motion
 * —————————————————————————————— */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .hero,
    .feature-list {
        backdrop-filter: none !important;
        -webkit-backdrop-filter: none !important;
    }
}