/* ===== 基础变量（默认黑色科技风） ===== */
:root,
[data-theme="dark"] {
    --bg-primary: #0a0a0f;
    --bg-secondary: #1a1a2e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --accent: #ff6900;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* 浅色主题 */
[data-theme="light"] {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #666666;
    --accent: #ff6900;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* 橙色主题 */
[data-theme="orange"] {
    --bg-primary: #ff6900;
    --bg-secondary: #ff8533;
    --text-primary: #ffffff;
    --text-secondary: #ffe0cc;
    --accent: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.25);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

/* ===== 全局样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    transition: background 0.5s ease, color 0.5s ease;
}

/* 黑色科技风背景光晕 */
[data-theme="dark"]::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(102, 126, 234, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(255, 105, 0, 0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(79, 172, 254, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

/* ===== 玻璃拟态效果 ===== */
.glass {
    background: transparent;
    border: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.glass:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* ===== 导航栏 ===== */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 40px;
    z-index: 50;
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

.nav-brand {
    display: flex;
    align-items: center;
    font-size: 1.2rem;
    font-weight: 600;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* ===== 语言选择器 ===== */
.lang-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lang-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.lang-arrow {
    transition: transform 0.3s ease;
}

.lang-selector.open .lang-arrow {
    transform: rotate(180deg);
}

.lang-card {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 180px;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 6px;
    display: none;
    flex-direction: column;
    gap: 2px;
    z-index: 100;
}

.lang-selector.open .lang-card {
    display: flex;
}

.lang-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 14px;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s ease;
    text-align: left;
}

.lang-option:hover {
    background: rgba(255, 255, 255, 0.1);
}

.lang-option.active {
    background: rgba(255, 105, 0, 0.15);
    color: var(--accent);
}

.lang-region {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ===== 主题切换器 ===== */
.theme-switcher {
    display: flex;
    align-items: center;
    gap: 6px;
}

.theme-btn {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}

.theme-dot {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid transparent;
}

.theme-btn[data-theme="dark"] .theme-dot { background: #1a1a2e; }
.theme-btn[data-theme="light"] .theme-dot { background: #ffffff; }
.theme-btn[data-theme="orange"] .theme-dot { background: #ff6900; }

html[data-theme="dark"] .theme-btn[data-theme="dark"].active .theme-dot {
    box-shadow: 0 0 12px 2px rgba(255, 105, 0, 0.7);
}
html[data-theme="light"] .theme-btn[data-theme="light"].active .theme-dot {
    box-shadow: 0 0 12px 2px rgba(0, 0, 0, 0.5);
}
html[data-theme="orange"] .theme-btn[data-theme="orange"].active .theme-dot {
    box-shadow: 0 0 12px 2px rgba(255, 255, 255, 0.7);
}

/* ===== 图片切换按钮 ===== */
.image-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.image-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.image-toggle-btn.hidden-state {
    opacity: 0.4;
}

/* ===== 首屏容器 ===== */
.hero {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

/* ===== 图片图层 =====
   横屏：图片沿弧形排列在文字右方，圆心在文字位置
   竖屏：图片在文字与新手教程按钮之间（见响应式部分） */

/* 弧形半径变量：随屏幕大小自适应，最小值确保不与文字重叠 */
.image-layer {
    --arc-r: clamp(245px, 25vw, 310px);    /* 弧形主半径（中间图片，最远） */
    --arc-r2: clamp(220px, 22vw, 275px);   /* 上下图片半径（略小，形成弧度） */
    --arc-y: clamp(70px, 10vh, 100px);     /* 上下垂直偏移 */
    --img-h: clamp(110px, 16vh, 160px);    /* 图片高度 */

    position: absolute;
    top: 50%;
    left: 50%;
    z-index: 3;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.image-layer.hidden {
    opacity: 0;
    pointer-events: none;
}

.product-img {
    --tx: 0px;
    --ty: 0px;
    --tr: 0deg;
    --scale: 1;
    position: absolute;
    top: 0;
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    pointer-events: auto;
    left: 0;
    height: var(--img-h);
    width: auto;
    object-fit: contain;
    border-radius: 12px;
    pointer-events: auto;
    /* 以容器中心（即文字位置）为圆心，沿弧形排列 */
    transform: translate(-50%, -50%) translate(var(--tx), var(--ty)) rotate(var(--tr)) scale(var(--scale));
    transition: transform 0.3s ease, filter 0.3s ease;
}

/* 三张图片沿弧形分布：中间最远，上下略近，形成圆形弧度 */
.product-img:nth-child(1) {
    --tx: var(--arc-r2);
    --ty: calc(var(--arc-y) * -1);
    --tr: -8deg;
}
.product-img:nth-child(2) {
    --tx: var(--arc-r);
    --ty: 0px;
    --tr: 0deg;
}
.product-img:nth-child(3) {
    --tx: var(--arc-r2);
    --ty: var(--arc-y);
    --tr: 8deg;
}

.product-img:hover {
    --scale: 1.08;
    filter: brightness(1.1) drop-shadow(0 4px 12px rgba(255, 255, 255, 0.15));
}

/* ===== 文字层 ===== */
.text-layer {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    z-index: 5;
    pointer-events: none;
}

.main-title {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.chinese {
    font-size: 3rem;
    font-weight: 700;
    letter-spacing: 8px;
    white-space: nowrap;
}

.english {
    font-size: 1.2rem;
    font-weight: 300;
    letter-spacing: 6px;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* ===== 滚动指示器 ===== */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    color: var(--text-secondary);
    opacity: 0.6;
    animation: scrollBounce 2s ease-in-out infinite;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.scroll-indicator svg {
    width: 28px;
    height: 28px;
}

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

/* 滚动后隐藏指示器 */
.scroll-indicator.fade-out {
    opacity: 0;
}

/* ===== 底部区域（第二屏，滚动到下方可见） ===== */
.bottom-section {
    position: relative;
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
    z-index: 10;
}

/* 下载其他相关软件按钮区域 */
.download-software-section {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px 24px;
    z-index: 10;
}

.tutorial-btn {
    --follow-x: 0px;
    --follow-y: 0px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 36px;
    border-radius: 25px;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 1px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 8px 32px var(--glass-shadow);
    cursor: pointer;
    transform: translate(var(--follow-x), var(--follow-y));
    transition: transform 0.3s ease, background 0.3s ease, color 0.3s ease, box-shadow 0.4s ease;
}

.tutorial-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translate(var(--follow-x), var(--follow-y)) translateY(-2px);
    color: var(--accent);
}

.coming-soon {
    font-size: 0.9rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* ===== 下载说明文字 ===== */
.download-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.9;
    opacity: 0.85;
    max-width: 520px;
    margin: 0 20px;
}

.download-desc .no-wrap {
    white-space: nowrap;
}

/* ===== 下载区域 ===== */
.download-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 30px 20px 30px;
    z-index: 10;
}

/* ===== QQ 群区域 ===== */
.qq-group-section {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 40px 20px 60px;
    z-index: 10;
}

.qq-group-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.8;
    opacity: 0.8;
    max-width: 480px;
    margin: 0;
}

.qq-group-btn {
    --follow-x: 0px;
    --follow-y: 0px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 36px;
    border-radius: 25px;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 1px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    box-shadow: 0 8px 32px var(--glass-shadow);
    transform: translate(var(--follow-x), var(--follow-y));
    transition: transform 0.3s ease, color 0.3s ease, box-shadow 0.4s ease;
    cursor: pointer;
}

.qq-group-btn:hover {
    transform: translate(var(--follow-x), var(--follow-y)) translateY(-2px);
    color: var(--accent);
}

/* QQ 群区域内的 coming-soon */
.qq-group-section .coming-soon {
    margin-top: 8px;
}

/* ===== 页脚 ===== */
.main-footer {
    position: relative;
    width: 100%;
    padding: 20px;
    text-align: center;
    z-index: 10;
    border-top: 1px solid var(--glass-border);
}

.main-footer p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    opacity: 0.5;
    letter-spacing: 1px;
}

/* ===== 移动端菜单按钮和弹出面板 ===== */
.nav-menu-toggle {
    display: none;
}

.nav-mobile-panel {
    display: none;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .main-nav {
        padding: 12px 16px;
    }

    .nav-brand {
        font-size: 1.05rem;
        white-space: nowrap;
    }

    /* 竖屏：隐藏导航栏右侧所有操作，显示菜单按钮 */
    .nav-right > .lang-selector,
    .nav-right > .theme-switcher,
    .nav-right > .image-toggle-btn,
    .nav-right > .particle-toggle-btn {
        display: none;
    }

    .nav-menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 34px;
        height: 34px;
        background: transparent;
        border: 1px solid var(--glass-border);
        border-radius: 8px;
        color: var(--text-primary);
        cursor: pointer;
        transition: all 0.3s ease;
    }

    .nav-menu-toggle:hover,
    .nav-menu-toggle.active {
        background: rgba(255, 255, 255, 0.1);
    }

    /* 弹出面板 */
    .nav-mobile-panel {
        display: none;
        position: absolute;
        top: calc(100% + 8px);
        right: 16px;
        min-width: 200px;
        background: var(--bg-secondary);
        border: 1px solid var(--glass-border);
        border-radius: 12px;
        padding: 12px;
        z-index: 100;
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        flex-direction: column;
        gap: 12px;
    }

    .nav-mobile-panel.open {
        display: flex;
    }

    /* 面板内分组 */
    .mobile-panel-row {
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .mobile-panel-label {
        font-size: 0.75rem;
        color: var(--text-secondary);
        white-space: nowrap;
        min-width: 44px;
    }

    /* 面板内语言按钮 */
    .mobile-panel-row .lang-btn {
        padding: 4px 8px;
        font-size: 0.75rem;
    }

    /* 面板内主题切换 */
    .mobile-panel-row .theme-switcher {
        display: flex;
        align-items: center;
        gap: 6px;
    }

    /* 面板内功能按钮 */
    .mobile-panel-row .mobile-func-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 32px;
        height: 32px;
        background: transparent;
        border: 1px solid var(--glass-border);
        border-radius: 8px;
        color: var(--text-primary);
        cursor: pointer;
        transition: all 0.3s ease;
    }

    .mobile-panel-row .mobile-func-btn:hover {
        background: rgba(255, 255, 255, 0.1);
    }

    .chinese {
        font-size: 1.8rem;
        letter-spacing: 3px;
        white-space: nowrap;
    }

    .english {
        font-size: 0.85rem;
        letter-spacing: 5px;
        white-space: nowrap;
    }

    /* 竖屏：图片横向排列，定位在文字与新手教程按钮之间 */
    .image-layer {
        --arc-r: 0px;
        --arc-r2: 0px;
        --arc-y: 0px;
        --img-h: 100px;

        position: absolute;
        top: 57%;
        left: 50%;
        display: flex;
        flex-direction: row;
        gap: 12px;
        align-items: center;
        justify-content: center;
        transform: translateX(-50%);
    }

    .image-layer.hidden {
        transform: translateX(-50%);
        opacity: 0;
    }

    .product-img {
        position: relative;
        top: auto;
        left: auto;
        /* 重置弧形偏移，改为水平排列 */
        --tx: 0px;
        --ty: 0px;
        --tr: 0deg;
        transform: scale(var(--scale));
    }

    .text-layer {
        position: absolute;
        transform: translate(-50%, -130%);
    }

    /* 竖屏：下载说明和 QQ 群说明文字允许自然换行 */
    .download-desc {
        max-width: 92%;
        font-size: 0.82rem;
        word-break: break-word;
    }

    /* 竖屏取消强制不换行 */
    .download-desc .no-wrap {
        white-space: normal;
    }

    .qq-group-desc {
        max-width: 92%;
        font-size: 0.82rem;
        word-break: break-word;
    }
}

/* ===== Hero 区域径向渐变光晕动画 ===== */
.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 40% 50%, rgba(255, 105, 0, 0.12) 0%, transparent 55%),
                radial-gradient(ellipse at 60% 50%, rgba(79, 172, 254, 0.08) 0%, transparent 55%);
    animation: heroGlow 6s ease-in-out infinite alternate;
    pointer-events: none;
    z-index: 2;
}

@keyframes heroGlow {
    0% { opacity: 0.6; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.15); }
}

/* ===== 文字发光效果（按主题覆盖） ===== */
.chinese {
    text-shadow: 0 0 30px rgba(255, 105, 0, 0.25), 0 0 60px rgba(255, 105, 0, 0.1);
}

.english {
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.15);
}

[data-theme="light"] .chinese {
    text-shadow: 0 0 30px rgba(255, 105, 0, 0.15), 0 0 60px rgba(255, 105, 0, 0.05);
}

[data-theme="light"] .english {
    text-shadow: 0 0 15px rgba(0, 0, 0, 0.08);
}

[data-theme="orange"] .chinese {
    text-shadow: 0 0 30px rgba(255, 255, 255, 0.35), 0 0 60px rgba(255, 255, 255, 0.15);
}

[data-theme="orange"] .english {
    text-shadow: 0 0 15px rgba(255, 255, 255, 0.25);
}

/* ===== 粒子背景画布 ===== */
.pinwheel-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ===== 粒子开关按钮 ===== */
.particle-toggle-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.particle-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.particle-toggle-btn.inactive {
    opacity: 0.4;
}

/* ===== 教程按钮 Glow Hover（按主题覆盖） ===== */
.tutorial-btn:hover,
.qq-group-btn:hover {
    box-shadow: 0 0 20px rgba(255, 105, 0, 0.35), 0 0 40px rgba(255, 105, 0, 0.15);
}

[data-theme="light"] .tutorial-btn:hover,
[data-theme="light"] .qq-group-btn:hover {
    box-shadow: 0 0 20px rgba(255, 105, 0, 0.25), 0 0 40px rgba(255, 105, 0, 0.1);
}

[data-theme="orange"] .tutorial-btn:hover,
[data-theme="orange"] .qq-group-btn:hover {
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.4), 0 0 40px rgba(255, 255, 255, 0.2);
}

/* ===== 淡入动画 ===== */
.fade-in-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.9s ease, transform 0.9s ease;
}

.fade-in-section.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 下载软件弹窗 ===== */
.sw-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 5000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.sw-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.sw-modal {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 28px;
    max-width: 420px;
    width: 90%;
    box-shadow: 0 16px 48px var(--glass-shadow);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.sw-modal-overlay.active .sw-modal {
    transform: scale(1);
}

.sw-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
}

.sw-modal-close:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.sw-modal-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sw-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 20px;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 14px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
}

.sw-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-glow);
    transform: translateY(-2px);
}

.sw-card-name {
    font-size: 0.95rem;
    font-weight: 600;
}

.sw-card-source {
    font-size: 0.8rem;
    color: var(--accent);
    padding: 4px 12px;
    background: var(--accent-glow);
    border-radius: 20px;
    white-space: nowrap;
}

/* 橙色主题下弹窗卡片适配 */
[data-theme="orange"] .sw-modal {
    background: rgba(255, 140, 50, 0.95);
}

[data-theme="orange"] .sw-card {
    background: rgba(0, 0, 0, 0.2);
}

[data-theme="orange"] .sw-card:hover {
    background: rgba(0, 0, 0, 0.35);
}