/* ============================================================
   download.css — 下载页专属样式（深色沉浸式主题）
   仅在 download.html 中引入，不影响其他页面
   所有选择器均以 .download-page 为前缀进行样式隔离
   ============================================================ */

/* ---------- 深色主题变量 ---------- */
.download-page {
    --dl-bg: #0a0a0f;
    --dl-bg-2: #0f0f1a;
    --dl-card-bg: rgba(255, 255, 255, 0.05);
    --dl-card-bg-hover: rgba(255, 255, 255, 0.09);
    --dl-gold: #f0c060;
    --dl-gold-dark: #e8a020;
    --dl-gold-glow: rgba(240, 192, 96, 0.3);
    --dl-text: #ffffff;
    --dl-text-muted: rgba(255, 255, 255, 0.65);
    --dl-text-dim: rgba(255, 255, 255, 0.4);
    --dl-border: rgba(255, 255, 255, 0.1);
    --dl-border-gold: rgba(240, 192, 96, 0.3);
}

/* ---------- 全局重置（下载页范围） ---------- */
.download-page {
    background-color: var(--dl-bg);
    color: var(--dl-text);
}

/* ---------- 导航栏覆盖：透明叠加在视频上 ---------- */
.download-page .navbar {
    background: transparent;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: none;
    transition: background 0.4s ease, backdrop-filter 0.4s ease;
}

.download-page .navbar.dl-nav-scrolled {
    background: rgba(10, 10, 15, 0.88);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
}

.download-page .navbar .logo {
    color: var(--dl-gold);
}

.download-page .navbar .logo i {
    color: var(--dl-gold);
}

.download-page .nav-menu a {
    color: rgba(255, 255, 255, 0.85);
}

.download-page .nav-menu a:hover,
.download-page .nav-menu a.active {
    color: var(--dl-gold);
}

.download-page .nav-menu a::after {
    background: var(--dl-gold);
}

.download-page .hamburger span {
    background: rgba(255, 255, 255, 0.85);
}

/* ---------- Hero 全屏视频区 ---------- */
.dl-hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    /* 独立层叠上下文，配合视频 z-index:-1，避免 iOS/Android 上 video 合成层盖住文案与按钮 */
    isolation: isolate;
    z-index: 0;
}

.dl-hero-video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: -1;
}

/* 视频不可用时的降级渐变背景 */
.dl-hero-fallback-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        #1a0a2e 0%,
        #0d0d20 30%,
        #0a0a0f 60%,
        #0d1a0a 100%
    );
    z-index: -1;
    display: none; /* 默认隐藏，JS 控制显示 */
}

/* 遮罩：顶部半透明 → 底部完全黑色，确保文字可读 */
.dl-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to bottom,
        rgba(10, 10, 15, 0.25) 0%,
        rgba(10, 10, 15, 0.5) 50%,
        rgba(10, 10, 15, 1) 100%
    );
    z-index: 1;
}

/* 粒子容器 */
.dl-particles {
    position: absolute;
    inset: 0;
    z-index: 2;
    overflow: hidden;
    pointer-events: none;
}

.dl-particle {
    position: absolute;
    border-radius: 50%;
    background: var(--dl-gold);
    opacity: 0;
    will-change: transform, opacity;
    animation: dl-particle-float linear infinite;
}

@keyframes dl-particle-float {
    0% {
        transform: translateY(110vh) scale(0.3);
        opacity: 0;
    }
    8% {
        opacity: 0.7;
    }
    85% {
        opacity: 0.3;
    }
    100% {
        transform: translateY(-10vh) scale(1.2);
        opacity: 0;
    }
}

/* Hero 内容 */
.dl-hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    padding: 0 20px;
    max-width: 700px;
    /* 提升合成层，减少部分 WebKit 下视频层意外压盖 */
    transform: translateZ(0);
    -webkit-transform: translateZ(0);
}

.dl-app-icon {
    width: 100px;
    height: 100px;
    border-radius: 24px;
    box-shadow: 0 0 40px var(--dl-gold-glow), 0 8px 32px rgba(0, 0, 0, 0.6);
    margin-bottom: 1.5rem;
    animation: dl-icon-float 4s ease-in-out infinite;
}

@keyframes dl-icon-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.dl-hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 800;
    color: var(--dl-text);
    margin-bottom: 0.75rem;
    letter-spacing: 0.05em;
    text-shadow: 0 0 40px var(--dl-gold-glow);
}

.dl-hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.4rem);
    color: var(--dl-text-muted);
    margin-bottom: 2.5rem;
    line-height: 1.6;
}

/* Hero CTA 按钮组 */
.dl-cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* 金色主按钮 */
.dl-btn-gold {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2.2rem;
    background: linear-gradient(135deg, var(--dl-gold) 0%, var(--dl-gold-dark) 100%);
    color: #0a0a0f;
    font-weight: 700;
    font-size: 1rem;
    border-radius: 50px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 0 24px var(--dl-gold-glow), 0 4px 16px rgba(0, 0, 0, 0.4);
    white-space: nowrap;
}

.dl-btn-gold:hover {
    transform: translateY(-3px);
    box-shadow: 0 0 48px rgba(240, 192, 96, 0.6), 0 8px 24px rgba(0, 0, 0, 0.5);
    color: #0a0a0f;
    text-decoration: none;
}

/* 轮廓次按钮 */
.dl-btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.9rem 2.2rem;
    background: transparent;
    color: var(--dl-text);
    font-weight: 600;
    font-size: 1rem;
    border-radius: 50px;
    text-decoration: none;
    border: 1.5px solid var(--dl-border-gold);
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.dl-btn-outline:hover {
    background: rgba(240, 192, 96, 0.1);
    border-color: var(--dl-gold);
    color: var(--dl-gold);
    transform: translateY(-3px);
    text-decoration: none;
}

/* 向下滚动提示 */
.dl-scroll-hint {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    color: rgba(255, 255, 255, 0.5);
    font-size: 1.5rem;
    animation: dl-bounce 2s ease-in-out infinite;
    cursor: pointer;
}

@keyframes dl-bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ---------- 通用区块样式（深色版） ---------- */
.dl-section {
    padding: 6rem 0;
    background: var(--dl-bg);
}

.dl-section-alt {
    background: var(--dl-bg-2);
}

.dl-section-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 700;
    color: var(--dl-text);
    text-align: center;
    margin-bottom: 0.75rem;
}

.dl-section-subtitle {
    font-size: 1.1rem;
    color: var(--dl-text-muted);
    text-align: center;
    margin-bottom: 3.5rem;
}

.dl-gold-divider {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--dl-gold), var(--dl-gold-dark));
    margin: 0.75rem auto 1.5rem;
    border-radius: 2px;
}

/* ---------- 毛玻璃卡片 ---------- */
.dl-glass-card {
    background: var(--dl-card-bg);
    border: 1px solid var(--dl-border);
    border-radius: 20px;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: transform 0.35s ease, box-shadow 0.35s ease, background 0.35s ease;
}

.dl-glass-card:hover {
    transform: translateY(-6px);
    background: var(--dl-card-bg-hover);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px var(--dl-gold-glow);
    border-color: var(--dl-border-gold);
}

/* ---------- 特性卡片区 ---------- */
.dl-features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.dl-feature-card {
    padding: 2rem 1.5rem;
    text-align: center;
}

.dl-feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, rgba(240, 192, 96, 0.2), rgba(232, 160, 32, 0.1));
    border: 1px solid var(--dl-border-gold);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    font-size: 1.6rem;
    color: var(--dl-gold);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.dl-feature-card:hover .dl-feature-icon {
    transform: scale(1.1);
    box-shadow: 0 0 20px var(--dl-gold-glow);
}

.dl-feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dl-text);
    margin-bottom: 0.6rem;
}

.dl-feature-card p {
    font-size: 0.9rem;
    color: var(--dl-text-muted);
    line-height: 1.6;
}

/* ---------- App 信息展示区 ---------- */
.dl-app-showcase {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.dl-app-logo-large {
    width: 120px;
    height: 120px;
    border-radius: 28px;
    box-shadow: 0 0 50px var(--dl-gold-glow);
    margin-bottom: 1.5rem;
}

.dl-app-name {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--dl-text);
    margin-bottom: 0.5rem;
}

.dl-app-version {
    font-size: 0.9rem;
    color: var(--dl-text-dim);
    margin-bottom: 1.25rem;
}

.dl-app-desc {
    font-size: 1rem;
    color: var(--dl-text-muted);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.dl-app-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.dl-tag {
    padding: 0.3rem 0.9rem;
    background: rgba(240, 192, 96, 0.12);
    border: 1px solid var(--dl-border-gold);
    border-radius: 50px;
    font-size: 0.85rem;
    color: var(--dl-gold);
}

/* ---------- 下载区 ---------- */
.dl-download-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.dl-download-card {
    padding: 2.5rem 2rem;
    text-align: center;
}

.dl-download-card h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dl-text);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.dl-download-card h3 i {
    color: var(--dl-gold);
}

.dl-download-card p {
    font-size: 0.95rem;
    color: var(--dl-text-muted);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.dl-qrcode-img {
    width: 180px;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
    border: 2px solid var(--dl-border-gold);
    margin-bottom: 1rem;
    box-shadow: 0 0 20px var(--dl-gold-glow);
}

.dl-download-note {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-top: 1.25rem;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 10px;
    font-size: 0.85rem;
    color: var(--dl-text-dim);
    text-align: left;
}

.dl-download-note i {
    color: var(--dl-gold);
    flex-shrink: 0;
    margin-top: 2px;
}

/* ---------- 应用商店上架提示 ---------- */
.dl-store-notice {
    max-width: 900px;
    margin: 2.5rem auto 0;
    padding: 2rem;
    border-radius: 20px;
    background: rgba(240, 192, 96, 0.06);
    border: 1px solid var(--dl-border-gold);
    display: flex;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.dl-store-notice-icon {
    font-size: 2.5rem;
    color: var(--dl-gold);
    flex-shrink: 0;
}

.dl-store-notice-text {
    flex: 1;
    min-width: 200px;
}

.dl-store-notice-text h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dl-text);
    margin-bottom: 0.4rem;
}

.dl-store-notice-text p {
    font-size: 0.9rem;
    color: var(--dl-text-muted);
    line-height: 1.6;
}

.dl-store-notice-text strong {
    color: var(--dl-gold);
}

.dl-store-icons {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.dl-store-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    color: var(--dl-text-dim);
}

.dl-store-item i {
    font-size: 1.6rem;
    color: var(--dl-text-muted);
}

/* ---------- 安装步骤区 ---------- */
.dl-steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    position: relative;
}

/* 步骤连接线 */
.dl-steps-grid::before {
    content: '';
    position: absolute;
    top: 36px;
    left: calc(12.5% + 1rem);
    right: calc(12.5% + 1rem);
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--dl-border-gold), transparent);
    z-index: 0;
}

.dl-step-card {
    padding: 2rem 1.25rem;
    text-align: center;
    position: relative;
    z-index: 1;
}

.dl-step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--dl-gold), var(--dl-gold-dark));
    color: #0a0a0f;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    font-weight: 800;
    margin: 0 auto 1.25rem;
    box-shadow: 0 0 20px var(--dl-gold-glow);
}

.dl-step-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--dl-text);
    margin-bottom: 0.5rem;
}

.dl-step-card p {
    font-size: 0.88rem;
    color: var(--dl-text-muted);
    line-height: 1.6;
}

/* ---------- 系统要求区 ---------- */
.dl-requirements {
    max-width: 700px;
    margin: 0 auto;
    padding: 2.5rem;
}

.dl-requirements h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--dl-text);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.dl-requirements h3 i {
    color: var(--dl-gold);
}

.dl-requirements ul {
    list-style: none;
    padding: 0;
}

.dl-requirements ul li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--dl-border);
    font-size: 0.95rem;
    color: var(--dl-text-muted);
}

.dl-requirements ul li:last-child {
    border-bottom: none;
}

.dl-requirements ul li i {
    color: var(--dl-gold);
    font-size: 0.9rem;
    flex-shrink: 0;
}

/* ---------- 联系支持区 ---------- */
.dl-support-section {
    padding: 5rem 0;
    background: linear-gradient(135deg, rgba(240, 192, 96, 0.08) 0%, rgba(10, 10, 15, 0) 100%);
    border-top: 1px solid var(--dl-border);
    text-align: center;
}

.dl-support-section h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dl-text);
    margin-bottom: 0.75rem;
}

.dl-support-section p {
    font-size: 1.05rem;
    color: var(--dl-text-muted);
    margin-bottom: 2rem;
}

/* ---------- 页脚覆盖（深色页面保持深色页脚） ---------- */
.download-page .footer {
    background: #050508;
    border-top: 1px solid var(--dl-border);
}

/* ---------- 入场动画 ---------- */
.fade-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.dl-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 延迟变体 */
.fade-up[data-delay="100"] { transition-delay: 0.1s; }
.fade-up[data-delay="200"] { transition-delay: 0.2s; }
.fade-up[data-delay="300"] { transition-delay: 0.3s; }
.fade-up[data-delay="400"] { transition-delay: 0.4s; }

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .dl-features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .dl-steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .dl-steps-grid::before {
        display: none;
    }

    .dl-app-showcase {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }

    .dl-app-tags {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .dl-hero {
        min-height: 100svh;
    }

    .dl-app-icon {
        width: 80px;
        height: 80px;
    }

    .dl-cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .dl-btn-gold,
    .dl-btn-outline {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    .dl-download-grid {
        grid-template-columns: 1fr;
    }

    .dl-store-notice {
        flex-direction: column;
        text-align: center;
    }

    .dl-store-icons {
        justify-content: center;
    }

    .dl-section {
        padding: 4rem 0;
    }
}

@media (max-width: 480px) {
    .dl-features-grid {
        grid-template-columns: 1fr;
    }

    .dl-steps-grid {
        grid-template-columns: 1fr;
    }

    .dl-hero-title {
        font-size: 2rem;
    }

    .dl-requirements {
        padding: 1.5rem;
    }
}