/* ============================================
   鲍鱼盒子 - 主样式表
   CSS变量 + 响应式 + 暗色模式
   ============================================ */

/* ---------- CSS 变量 ---------- */
:root {
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-accent: #8b5cf6;
    --color-amber: #f59e0b;
    --color-amber-light: #fef3c7;
    --color-green: #059669;
    --color-dark: #1e293b;
    --color-gray: #64748b;
    --color-gray-light: #f1f5f9;
    --color-white: #ffffff;
    --radius-card: 24px;
    --radius-btn: 14px;
    --radius-sm: 10px;
    --shadow-card: 0 8px 40px rgba(0, 0, 0, 0.18);
    --shadow-btn: 0 4px 16px rgba(0, 0, 0, 0.12);
    --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
    --gap-sm: 10px;
    --gap-md: 16px;
    --gap-lg: 28px;
}

/* ---------- 全局重置 ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-stack);
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 18px;
    background: linear-gradient(160deg, var(--color-primary) 0%, var(--color-accent) 100%);
    background-attachment: fixed;
    line-height: 1.6;
    color: var(--color-dark);
}

/* ---------- 面包屑导航 ---------- */
.crumb {
    position: absolute;
    top: 12px;
    left: 20px;
    z-index: 10;
}

.crumb__list {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
}

.crumb__item {
    color: rgba(255, 255, 255, 0.65);
}

.crumb__item + .crumb__item::before {
    content: "/";
    margin-right: 6px;
    color: rgba(255, 255, 255, 0.4);
}

.crumb__item--active {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

/* ---------- 页面容器 ---------- */
.page {
    width: 100%;
    max-width: 460px;
}

.card {
    background: var(--color-white);
    border-radius: var(--radius-card);
    padding: 42px 36px 32px;
    box-shadow: var(--shadow-card);
}

/* ---------- 品牌头部 ---------- */
.brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    margin-bottom: 32px;
}

.brand__icon {
    display: block;
    width: 72px;
    height: 72px;
    border-radius: 18px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    object-fit: cover;
}

.brand__title {
    font-size: 2.1rem;
    font-weight: 700;
    color: var(--color-dark);
    letter-spacing: 0.5px;
    line-height: 1.2;
    margin-bottom: 4px;
}

.brand__desc {
    font-size: 0.95rem;
    color: var(--color-gray);
    font-weight: 400;
}

/* ---------- 公告区（替代邀请码） ---------- */
.notice {
    background: linear-gradient(135deg, #fef9e7 0%, #fef3c7 100%);
    border: 2px solid var(--color-amber);
    border-radius: var(--radius-btn);
    padding: 22px 20px;
    margin-bottom: var(--gap-lg);
    text-align: center;
}

.notice__label {
    color: #b45309;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.notice__highlight {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 10px;
}

.notice__feature {
    font-size: 1.25rem;
    font-weight: 700;
    color: #b45309;
    background: var(--color-white);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    letter-spacing: 0.5px;
}

.notice__divider {
    color: #d97706;
    font-size: 1.4rem;
    font-weight: 300;
}

.notice__tip {
    color: #92400e;
    font-size: 0.82rem;
    margin-top: 4px;
}

/* ---------- 下载按钮 ---------- */
.downloads {
    display: flex;
    flex-direction: column;
    gap: var(--gap-md);
    margin-bottom: 24px;
}

.dl-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 18px 20px;
    border: none;
    border-radius: var(--radius-btn);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-white);
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.25s ease;
    outline: none;
    font-family: var(--font-stack);
    letter-spacing: 0.3px;
}

.dl-btn:active {
    transform: scale(0.97);
}

.dl-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-btn);
}

.dl-btn--android {
    background: var(--color-primary);
}

.dl-btn--android:hover {
    background: var(--color-primary-dark);
}

.dl-btn--ios {
    background: var(--color-dark);
}

.dl-btn--ios:hover {
    background: #0f172a;
}

.dl-btn__emoji {
    font-size: 1.5rem;
    line-height: 1;
}

/* ---------- 辅助入口 ---------- */
.extra {
    margin-bottom: 8px;
}

.ext-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    padding: 16px 20px;
    border: none;
    border-radius: var(--radius-btn);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-white);
    background: var(--color-green);
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.25s ease;
    outline: none;
    font-family: var(--font-stack);
    letter-spacing: 0.3px;
}

.ext-btn:active {
    transform: scale(0.97);
}

.ext-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-btn);
    background: #047857;
}

.ext-btn__emoji {
    font-size: 1.4rem;
    line-height: 1;
}

/* ---------- 折叠面板 ---------- */
.panel {
    margin-top: 30px;
    text-align: center;
}

.panel__trigger {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-gray-light);
    color: var(--color-gray);
    border: 1px solid #e2e8f0;
    padding: 10px 28px;
    border-radius: 30px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    font-family: var(--font-stack);
    transition: background 0.3s, color 0.3s;
    outline: none;
}

.panel__trigger:hover {
    background: #e2e8f0;
    color: var(--color-dark);
}

.panel__arrow {
    font-size: 0.7rem;
    transition: transform 0.25s;
}

.panel__body {
    display: none;
    margin-top: 26px;
    text-align: left;
    padding: 28px 26px;
    background: #fafbfc;
    border-radius: var(--radius-sm);
    border: 1px solid #e8ecf1;
}

/* ---------- 功能介绍 ---------- */
.features {
    margin-bottom: 32px;
}

.features__heading {
    font-size: 1.25rem;
    color: var(--color-dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-primary);
    display: inline-block;
}

.features__summary {
    color: var(--color-gray);
    font-size: 0.9rem;
    line-height: 1.9;
    margin-bottom: 20px;
}

.features__title {
    font-size: 1rem;
    color: var(--color-primary);
    margin-top: 22px;
    margin-bottom: 8px;
    position: relative;
    padding-left: 16px;
}

.features__title::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 5px;
    height: 16px;
    background: var(--color-primary);
    border-radius: 3px;
}

.features__text {
    color: var(--color-gray);
    font-size: 0.88rem;
    line-height: 1.85;
}

/* ---------- 常见问题 ---------- */
.faq__heading {
    font-size: 1.25rem;
    color: var(--color-dark);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-green);
    display: inline-block;
}

.faq__item {
    margin-bottom: 20px;
    padding-bottom: 18px;
    border-bottom: 1px dashed #e5e7eb;
}

.faq__item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.faq__question {
    font-size: 0.98rem;
    color: var(--color-dark);
    margin-bottom: 8px;
    font-weight: 600;
}

.faq__answer {
    color: var(--color-gray);
    font-size: 0.86rem;
    line-height: 1.85;
}

/* ---------- 底部 ---------- */
.foot {
    margin-top: 28px;
    padding-top: 18px;
    border-top: 1px solid #e8ecf1;
    text-align: center;
}

.foot__link {
    color: var(--color-primary);
    text-decoration: none;
}

.foot__link:hover {
    text-decoration: underline;
}

.foot__contact {
    color: #94a3b8;
    font-size: 0.72rem;
    margin-top: 6px;
}

.foot__text {
    color: #94a3b8;
    font-size: 0.78rem;
    letter-spacing: 0.3px;
}

/* ---------- Toast 消息 ---------- */
.toast {
    position: fixed;
    top: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(-120px);
    background: var(--color-dark);
    color: var(--color-white);
    padding: 12px 28px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 999;
    pointer-events: none;
    opacity: 0;
    transition: transform 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275),
                opacity 0.3s ease;
}

.toast--visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* ============================================
   响应式适配
   ============================================ */

/* 小屏手机（<380px） */
@media (max-width: 380px) {
    .card {
        padding: 30px 18px 24px;
    }

    .brand__title {
        font-size: 1.7rem;
    }

    .brand__icon {
        width: 58px;
        height: 58px;
    }

    .notice__feature {
        font-size: 1rem;
        padding: 6px 12px;
    }

    .dl-btn {
        font-size: 1rem;
        padding: 15px 16px;
    }

    .panel__body {
        padding: 20px 16px;
    }
}

/* 平板及以上（≥768px） */
@media (min-width: 768px) {
    body {
        padding: 40px;
    }

    .card {
        padding: 50px 48px 40px;
    }

    .brand__title {
        font-size: 2.4rem;
    }

    .brand__icon {
        width: 84px;
        height: 84px;
    }

    .downloads {
        flex-direction: row;
        gap: 18px;
    }

    .dl-btn {
        flex: 1;
    }

    .features__text,
    .faq__answer {
        font-size: 0.92rem;
    }
}

/* 暗色模式适配 */
@media (prefers-color-scheme: dark) {
    /* 暗色模式下保持白色卡片为主视觉，仅微调外部 */
    body {
        background: linear-gradient(160deg, #312e81 0%, #4c1d95 100%);
    }
}