/* =================================================================
   1. 变量与基础设置 (Variables & Resets)
   ================================================================= */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-page: #ffffff;
    --bg-page-hero: radial-gradient(circle at 50% 0%, #f0f8f1, #E6F4EA 80%);
    --text-primary: #2d3748;
    --text-secondary: #718096;
    --text-on-theme: #ffffff;
    --theme-green: #34A853;
    --theme-green-dark: #2b7a4b;
    --theme-green-light-bg: #E6F4EA;
    --border-primary: #e2e8f0;
    --border-theme: #34A853;
    
    /* Shadows */
    --shadow-color-light: rgba(0,0,0,0.08);
    --shadow-color-medium: rgba(0,0,0,0.12);
    --shadow-theme: rgba(52, 168, 83, 0.3);
    --shadow-theme-hover: rgba(52, 168, 83, 0.4);
    --shadow-theme-heavy: rgba(52, 168, 83, 0.5);
    
    /* Components */
    --radio-border: #adb5bd;
    --btn-disabled-bg: #969696;
    --alert-bg: #ef4444;
    --alert-shadow: rgba(239, 68, 68, 0.4);
    --quick-nav-bg: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] {
    --bg-primary: #1A202C;
    --bg-secondary: #2D3748;
    --bg-page: #1A202C;
    --bg-page-hero: radial-gradient(circle at 50% 0%, #2D3748, #12161F 80%);
    --text-primary: #E2E8F0;
    --text-secondary: #A0AEC0;
    --text-on-theme: #ffffff;
    --theme-green: #38A169;
    --theme-green-dark: #C6F6D5;
    --theme-green-light-bg: #2D3748;
    --border-primary: #4A5568;
    --border-theme: #38A169;
    
    /* Shadows */
    --shadow-color-light: rgba(0,0,0,0.2);
    --shadow-color-medium: rgba(0,0,0,0.3);
    --shadow-theme: rgba(56, 161, 105, 0.4);
    --shadow-theme-hover: rgba(56, 161, 105, 0.5);
    --shadow-theme-heavy: rgba(56, 161, 105, 0.6);
    
    /* Components */
    --radio-border: #718096;
    --btn-disabled-bg: #718096;
    --alert-bg: #ef4444;
    --alert-shadow: rgba(239, 68, 68, 0.4);
    --quick-nav-bg: rgba(45, 55, 72, 0.95);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 90px;
    width: 100%;
    overflow-x: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-page);
    overflow-x: hidden;
    transition: background 0.3s ease, color 0.3s ease;
    padding-top: 72px; /* 为固定Header留出空间 */
    position: relative;
}

/* =================================================================
   2. 顶部导航栏 (Header)
   ================================================================= */
.site-header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-primary);
    padding: 10px 0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px var(--shadow-color-light);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 50px;
}

.header-branding {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.header-logo {
    width: 32px;
    height: 32px;
}

.header-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--theme-green);
}

/* 顶部右侧控制区 (主题切换/登录/语言) */
.hero-controls {
    display: flex; 
    align-items: center;
    gap: 10px;
}

/* 主题切换按钮 */
.hero-controls #theme-toggle {
    text-decoration: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}
.hero-controls #theme-toggle:hover {
    background: var(--bg-secondary);
    transform: scale(1.1);
}
.hero-controls #theme-toggle [data-lang="navTheme"] {
    display: none;
}
#theme-toggle .icon-sun { display: none; }
[data-theme="dark"] #theme-toggle .icon-moon { display: none; }
[data-theme="dark"] #theme-toggle .icon-sun { display: inline-block; }
#theme-toggle .icon-moon { display: inline-block; }

/* 顶部简单的分割线 (如果JS动态添加) */
.hero-controls-divider {
    width: 1px;
    height: 20px;
    background: var(--border-primary);
}

/* =================================================================
   3. 侧边快捷导航 (Quick Nav)
   ================================================================= */
.quick-nav {
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    background: var(--quick-nav-bg);
    border-radius: 10px;
    box-shadow: 0 4px 15px var(--shadow-color-medium);
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 999;
    border: 1px solid var(--border-primary);
    transition: all 0.3s ease;
}

.quick-nav a {
    text-decoration: none;
    color: var(--theme-green);
    font-weight: 500;
    font-size: 0.9rem;
    padding: 8px 12px;
    border-radius: 5px;
    transition: all 0.2s ease;
    text-align: center;
    display: flex;
    align-items: center;
    gap: 5px;
    white-space: nowrap;
}

.quick-nav a:hover {
    background: var(--theme-green-light-bg);
    color: var(--theme-green-dark);
}

/* 侧边栏语言选择器 */
.quick-nav .hero-lang-selector {
    position: relative;
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 8px 12px;
    border-radius: 5px;
    text-align: center;
    white-space: nowrap;
    transition: all 0.2s ease;
    color: var(--theme-green);
}
.quick-nav .hero-lang-selector:hover {
    background: var(--theme-green-light-bg);
    color: var(--theme-green-dark);
}
.quick-nav .hero-lang-selector select {
    background: transparent;
    border: none;
    color: var(--theme-green);
    font-weight: 500;
    font-size: 0.9rem;
    appearance: none;
    cursor: pointer;
    outline: none;
    padding: 0;
    margin: 0;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    z-index: 1;
}
.quick-nav .hero-lang-selector select option {
    color: var(--text-primary);
    background: var(--bg-primary);
}

/* 折叠按钮 */
.quick-nav .nav-toggle {
    justify-content: center;
    border-top: 1px solid var(--border-primary);
    margin-top: 8px;
    padding-top: 8px;
    cursor: pointer;
}

/* 折叠状态 */
.quick-nav.collapsed {
    padding: 10px;
    width: auto;
    right: 15px;
}
.quick-nav.collapsed .nav-item {
    display: none;
}
.quick-nav.collapsed .nav-toggle {
    border: none;
    margin: -8px -12px;
    padding: 8px 12px;
}
.quick-nav.collapsed .nav-toggle .icon-collapse { display: none; }
.quick-nav.collapsed .nav-toggle .icon-expand { display: inline-block; }


/* =================================================================
   4. 通用布局与销售信风格 (Layout & Sales Letter)
   ================================================================= */
.sales-letter-section {
    padding: 20px 20px;
    background: var(--bg-secondary);
}

.sales-letter-card {
    background: var(--bg-primary);
    max-width: 800px;
    margin: 0 auto;
    padding: 60px;
    border-radius: 12px;
    box-shadow: 0 4px 30px var(--shadow-color-medium);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.sl-main-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--theme-green);
    margin-bottom: 30px;
    line-height: 1.4;
    border-bottom: 1px solid var(--border-primary);
    padding-bottom: 20px;
    text-align: center;
}

.sl-section-title {
    margin-top: 50px;
    margin-bottom: 25px;
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--theme-green);
    background: var(--theme-green-light-bg);
    display: inline-block;
    padding: 5px 15px;
    border-radius: 8px;
}

.sl-text {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 25px;
}

.sl-highlight {
    color: var(--theme-green);
}

.sl-story-img, .sl-nick-img {
    display: block;
    margin: 20px auto;
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
.sl-story-img { max-width: 250px; }
.sl-nick-img { max-width: 200px; }

/* 功能列表项 */
.sl-feature-item {
    margin-bottom: 25px;
}
.sl-feature-title {
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
    display: block;
}

/* 截图并排显示 */
.screenshot-item {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}
.screenshot-item-img {
    width: 100%;
    max-width: 380px;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 8px 25px var(--shadow-color-medium);
    transition: all 0.4s ease;
    cursor: pointer;
}
.screenshot-item-img:hover {
    transform: translateY(-4px);
    box-shadow: 0 15px 35px var(--shadow-color-medium);
}

/* 截图语言切换动画 */
.lang-img {
    transition: opacity 0.4s ease;
}
.lang-img[style*="display: none"] { opacity: 0; }
.lang-img:not([style*="display: none"]) { opacity: 1; }

/* 通用按钮 (下载/订阅) */
.download-btn, .subscribe-btn {
    display: block;
    width: 100%;
    max-width: 500px;
    margin: 30px auto 0;
    padding: 20px 60px;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-on-theme);
    background: var(--theme-green);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 30px var(--shadow-theme);
    text-decoration: none;
    text-align: center;
}
.download-btn:hover, .subscribe-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px var(--shadow-theme-heavy);
}
.subscribe-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: var(--btn-disabled-bg);
    box-shadow: none;
}


/* =================================================================
   5. 定价区域 (Pricing)
   ================================================================= */
.pricing-grid {
    display: grid;
    gap: 20px;
}

.pricing-option {
    background: var(--bg-primary);
    border: 2px solid var(--border-primary);
    border-radius: 16px;
    padding: 30px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: grid;
    grid-template-columns: 40px 1fr auto;
    align-items: center;
    gap: 20px;
}

.pricing-option:hover {
    border-color: var(--border-theme);
    transform: translateY(-5px);
}
.pricing-option.selected {
    background: var(--theme-green-light-bg);
    border-color: var(--border-theme);
    box-shadow: 0 8px 30px var(--shadow-theme);
}

/* 单选圈 */
.radio-circle {
    width: 24px;
    height: 24px;
    border: 2px solid var(--radio-border);
    border-radius: 50%;
    position: relative;
    transition: all 0.3s ease;
}
.pricing-option.selected .radio-circle {
    border-color: var(--border-theme);
}
.pricing-option.selected .radio-circle::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 12px;
    height: 12px;
    background: var(--border-theme);
    border-radius: 50%;
}

.pricing-info {
    display: flex;
    flex-direction: column;
}
.pricing-period {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 5px;
}
.pricing-note {
    font-size: 0.9rem;
    opacity: 0.8;
    color: var(--text-secondary);
}
.pricing-amount {
    font-size: 2rem;
    font-weight: 700;
    color: var(--theme-green);
}
.popular-badge {
    background: var(--theme-green-light-bg);
    color: var(--theme-green-dark);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-left: 10px;
}


/* =================================================================
   6. 留言板/FAQ (FAQ Board)
   ================================================================= */
.faq-board {
    padding: 20px 20px;
    background: var(--bg-secondary);
    transition: background 0.3s ease;
}
.faq-board h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

/* 搜索栏 */
.faq-search-bar {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    width: 100%;
    max-width: 600px;
    margin: 0 auto 40px;
}
.faq-search-bar input {
    flex: 1;
    min-width: 0;
    height: 50px;
    padding: 0 20px;
    border-radius: 50px;
    border: 1px solid var(--border-primary);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}
.faq-search-bar input:focus {
    outline: none;
    border-color: var(--theme-green);
    background: var(--bg-primary);
    box-shadow: 0 0 0 3px var(--shadow-theme);
}
.faq-search-bar button {
    flex-shrink: 0;
    height: 50px;
    padding: 0 30px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    background: var(--theme-green);
    color: var(--text-on-theme);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.faq-search-bar button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow-theme);
}

/* 提交表单 */
.faq-submit-form {
    background: var(--bg-primary);
    border-radius: 16px;
    box-shadow: 0 4px 20px var(--shadow-color-light);
    margin-bottom: 40px;
}
.faq-submit-form h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    text-align: center;
    color: var(--text-secondary);
}
.faq-submit-form .faq-form-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 15px;
    margin-bottom: 15px;
}
.faq-submit-form textarea {
    width: 100%;
    min-height: 120px;
    padding: 15px;
    border-radius: 12px;
    border: 2px solid var(--border-primary);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    resize: vertical;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}
.faq-submit-form textarea:focus {
    outline: none;
    border-color: var(--border-theme);
}
.faq-submit-form button {
    display: block;
    width: 100%;
    padding: 15px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-on-theme);
    background: var(--theme-green);
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.faq-submit-form button:hover:not(:disabled) { opacity: 0.85; }
.faq-submit-form button:disabled { background: var(--btn-disabled-bg); cursor: not-allowed; }

/* 昵称输入框特殊处理 */
.faq-nickname-container {
    position: relative;
    width: 100%;
}
.faq-submit-form #faq-submit-nickname {
    width: 100%;
    padding: 15px; /* 默认 */
    border-radius: 12px;
    border: 2px solid var(--border-primary);
    font-size: 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}
.faq-submit-form #faq-submit-nickname:focus {
    outline: none;
    border-color: var(--border-theme);
}
#faq-use-my-name-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: auto;
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 6px;
    padding: 5px 10px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: none;
    white-space: nowrap;
}
#faq-use-my-name-btn:hover {
    background: var(--border-primary);
    color: var(--text-primary);
}

.faq-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 15px;
    text-align: center;
    display: none;
}
.faq-message.show { display: block; }
.faq-message.success { color: var(--theme-green); }
.faq-message.error { color: var(--alert-bg); }

/* 留言列表 */
.faq-list-container { margin-top: 30px; }
.faq-list-container h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--theme-green-dark);
    border-bottom: 2px solid var(--theme-green-light-bg);
    padding-bottom: 10px;
}
.faq-item {
    background: var(--bg-primary);
    border-radius: 12px;
    border: 1px solid var(--border-primary);
    margin-bottom: 20px;
    overflow: hidden;
    box-shadow: 0 4px 10px var(--shadow-color-light);
    transition: all 0.3s ease;
}
.faq-item.is-pinned { border-left: 5px solid var(--border-theme); }

.faq-item-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.faq-item-header:hover { background: var(--theme-green-light-bg); }
.faq-item-question {
    width: 100%;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    padding-right: 15px;
}
.faq-item-nickname {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}
.faq-item-nickname span {
    font-weight: 400;
    color: var(--text-secondary);
    font-size: 0.9rem;
}
.faq-item-question-content {
    padding-left: 10px;
    border-left: 3px solid var(--border-primary);
}
.faq-item.is-pinned .faq-item-question-content {
    border-left-color: var(--theme-green-light-bg);
}
.faq-item-question-content p {
    white-space: pre-wrap;
    word-break: break-word;
}
.faq-item-toggle {
    font-size: 1.5rem;
    color: var(--theme-green);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}
.faq-item.open .faq-item-toggle { transform: rotate(45deg); }

.faq-item-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out;
}
.faq-item-content { padding: 0 20px 20px 20px; }

/* 留言回复样式 */
.faq-admin-reply {
    background: var(--theme-green-light-bg);
    border-radius: 8px;
    padding: 15px;
    margin-top: 15px;
    border-left: 4px solid var(--theme-green);
}
.faq-admin-reply-header {
    font-weight: 700;
    color: var(--theme-green-dark);
    margin-bottom: 5px;
}
.faq-admin-reply p, .faq-user-reply {
    color: var(--text-primary);
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
}
.faq-user-replies {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px dashed var(--border-primary);
}
.faq-user-reply {
    color: var(--text-secondary);
    padding: 10px;
    background: var(--bg-secondary);
    border-radius: 6px;
    margin-bottom: 8px;
}

/* 分页 */
.faq-pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 40px;
}
.faq-pagination button {
    padding: 10px 15px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--theme-green);
    background: var(--bg-primary);
    border: 2px solid var(--border-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}
.faq-pagination button:hover:not(:disabled) {
    background: var(--theme-green-light-bg);
    border-color: var(--theme-green);
}
.faq-pagination button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}
.faq-pagination span {
    font-size: 1rem;
    color: var(--text-secondary);
    padding: 0 10px;
}
.faq-loading, .faq-no-results {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    padding: 30px 0;
}


/* =================================================================
   7. 管理员面板 (Admin Controls)
   ================================================================= */
.faq-admin-bar {
    background: var(--bg-secondary);
    padding: 15px 20px;
    border-radius: 12px;
    margin-bottom: 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 10px var(--shadow-color-light);
}
.faq-admin-bar span {
    font-weight: 600;
    color: var(--theme-green);
}
.faq-admin-bar .admin-logout-btn {
    padding: 8px 15px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-on-theme);
    background: var(--alert-bg);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 0.3s ease;
}
.faq-admin-bar .admin-logout-btn:hover { opacity: 0.8; }

.faq-item-admin-controls {
    padding: 15px 20px;
    background: var(--theme-green-light-bg);
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    border-top: 1px solid var(--border-primary);
}
.faq-item-admin-controls button, .faq-item-admin-controls span {
    padding: 8px 12px;
    font-size: 0.85rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
}
.faq-admin-btn-approve { background: var(--theme-green); color: var(--text-on-theme); }
.faq-admin-btn-reject, .faq-admin-btn-delete, .faq-admin-btn-unpin { background: #ef4444; color: white; }
.faq-admin-btn-reply, .faq-admin-btn-pin { background: #3b82f6; color: white; }
.faq-admin-btn-pending { background: #eab308; color: white; cursor: not-allowed; }
.faq-admin-btn-rejected { background: #718096; color: white; cursor: not-allowed; }

.faq-item-admin-reply-form {
    padding: 15px 20px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
}
.faq-item-admin-reply-form textarea {
    width: 100%;
    min-height: 80px;
    padding: 10px;
    border-radius: 8px;
    border: 2px solid var(--border-primary);
    font-size: 0.95rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: inherit;
    resize: vertical;
    margin-bottom: 10px;
}
.faq-item-admin-reply-form textarea:focus {
    outline: none;
    border-color: var(--border-theme);
}
.faq-item-admin-reply-form div {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}
.faq-item-admin-reply-form button {
    padding: 8px 12px;
    font-size: 0.9rem;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}
.faq-admin-reply-save { background: var(--theme-green); color: var(--text-on-theme); }
.faq-admin-reply-cancel { background: var(--bg-primary); color: var(--text-secondary); border: 1px solid var(--border-primary); }


/* =================================================================
   8. 弹窗与覆盖层 (Modals & Overlays)
   ================================================================= */
/* 通用覆盖层 */
.admin-modal-overlay, .auth-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex; /* 改为 flex 居中 */
    justify-content: center;
    align-items: center;
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease;
}
.admin-modal-overlay.show, .auth-modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

/* 弹窗内容 */
.admin-modal-content, .auth-modal-content {
    background: var(--bg-primary);
    padding: 40px;
    border-radius: 16px;
    box-shadow: 0 10px 40px var(--shadow-color-medium);
    width: 90%;
    max-width: 400px;
    transform: scale(0.9);
    transition: transform 0.3s ease;
    position: relative;
}
.admin-modal-overlay.show .admin-modal-content, 
.auth-modal-overlay.show .auth-modal-content {
    transform: scale(1);
}

.auth-modal-close {
    position: absolute;
    top: 10px;
    right: 15px;
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    transition: transform 0.2s ease;
}
.auth-modal-close:hover { transform: scale(1.1); }

/* 弹窗内的标题与表单 */
.admin-modal-content h3, .auth-modal-content h3 {
    font-size: 1.8rem;
    margin-bottom: 25px;
    text-align: center;
    color: var(--theme-green);
}
.admin-modal-form-group, .auth-form-group { margin-bottom: 20px; }
.admin-modal-form-group label, .auth-form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-secondary);
}
.admin-modal-form-group input, .auth-form-group input {
    width: 100%;
    padding: 12px 15px;
    border-radius: 10px;
    border: 2px solid var(--border-primary);
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.3s ease;
}
.admin-modal-form-group input:focus, .auth-form-group input:focus {
    outline: none;
    border-color: var(--border-theme);
}

/* 弹窗按钮 */
.admin-modal-buttons {
    display: flex;
    gap: 15px;
    margin-top: 25px;
}
.admin-modal-buttons button {
    flex: 1;
    padding: 12px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}
.admin-modal-buttons .admin-login-btn { background: var(--theme-green); color: var(--text-on-theme); }
.admin-modal-buttons .admin-cancel-btn { background: var(--bg-secondary); color: var(--text-secondary); }

.admin-modal-error, .auth-modal-alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.95rem;
    display: none;
}
.admin-modal-error { color: var(--alert-bg); text-align: center; display: none; }
.auth-alert-error { background: var(--alert-bg); color: white; }
.auth-alert-success { background: var(--theme-green); color: white; }

/* 注册宽屏弹窗布局 */
.register-modal-wide {
    max-width: 900px !important;
    width: 95% !important;
    padding: 40px !important;
    max-height: 90vh;
    overflow-y: auto;
}
.register-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: start;
}
.register-sidebar {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.register-sidebar h3 {
    margin-bottom: 20px;
    font-size: 2rem;
    color: var(--theme-green);
}
.register-privacy-notice {
    background: var(--bg-secondary);
    border-left: 4px solid var(--theme-green);
    padding: 20px;
    border-radius: 0 12px 12px 0;
    margin: 25px 0;
    flex-grow: 1;
}
.privacy-title {
    font-weight: 700;
    color: var(--theme-green-dark);
    margin-bottom: 10px;
    font-size: 1.1rem;
}
.auth-modal-register-prompt {
    text-align: center;
    font-size: 0.95rem;
    color: var(--text-secondary);
}
.auth-modal-register-prompt a {
    color: var(--theme-green);
    text-decoration: none;
    font-weight: 600;
}


/* =================================================================
   9. 其他组件 (联系, 底部, Lightbox, Alert)
   ================================================================= */
/* 联系方式 */
.contact {
    padding: 20px 20px;
    background: var(--bg-secondary);
    text-align: center;
    transition: background 0.3s ease;
}
.contact h2 {
    font-size: 2.5rem;
    margin-bottom: 40px;
    color: var(--theme-green);
}
.contact-qr {
    width: 200px;
    height: auto;
    margin-bottom: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--shadow-color-light);
}
.contact-tip {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-top: 10px;
}
.contact-email-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}
.contact-email {
    font-size: 1.2rem;
    color: var(--theme-green);
    font-weight: 600;
    text-decoration: none;
    transition: color 0.3s ease, transform 0.2s ease;
}
.contact-email:hover {
    color: var(--theme-green-dark);
    transform: scale(1.05);
}
.copy-btn {
    background: var(--theme-green);
    color: var(--text-on-theme);
    border: none;
    border-radius: 8px;
    padding: 8px 16px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}
.copy-btn:hover {
    background: var(--theme-green-dark);
    transform: scale(1.05);
}

/* 页脚 */
.site-footer {
    text-align: center;
    padding: 40px 20px;
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0;
    transition: background 0.3s ease, color 0.3s ease;
}

/* Lightbox */
.lightbox {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}
.lightbox.active { display: flex; }
.lightbox-content {
    max-width: 90%;
    max-height: 90vh;
    animation: zoomIn 0.3s ease;
}
.lightbox-close {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 40px;
    color: white;
    cursor: pointer;
    transition: transform 0.2s ease;
}
.lightbox-close:hover { transform: scale(1.1); }

/* 全局提示条 (Alert) */
.alert {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--alert-bg);
    color: white;
    padding: 15px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 20px var(--alert-shadow);
    z-index: 1000;
    display: none;
    animation: slideDown 0.3s ease;
}
.alert.show { display: block; }

/* 动画定义 */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}
@keyframes zoomIn {
    from { transform: scale(0.8); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}
@keyframes slideDown {
    from { opacity: 0; transform: translate(-50%, -20px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}


/* =================================================================
   10. 移动端适配与响应式 (Mobile Responsiveness)
   ================================================================= */

/* 1. 平板/小型笔记本 (max-width: 868px) */
@media (max-width: 868px) {
    .screenshot-item {
        flex-direction: column;
        align-items: center;
        gap: 30px;
    }
    .screenshot-item-img {
        max-width: 100%;
    }
}

/* 2. 手机/窄屏 (max-width: 768px) */
@media (max-width: 768px) {
    /* 通用字体大小调整 */
    .sl-main-title { font-size: 1.6rem; text-align: center; }
    .sl-text { font-size: 1.05rem; }
    .faq-board h2, .contact h2 { font-size: 2rem; }
    
    /* 销售信卡片与容器调整 */
    .sales-letter-card {
        padding: 30px 15px !important;
        border-radius: 8px;
        width: 100%;
    }
    .sl-story-img, .contact-qr {
        max-width: 100% !important;
        height: auto;
    }
    .container { padding: 0; width: 100%; }
    
    /* 定价选项移动端优化 */
    .pricing-option {
        display: grid;
        grid-template-columns: 30px 1fr auto; 
        align-items: center;
        padding: 15px;
        gap: 10px;
    }
    .pricing-option .radio-circle {
        width: 20px; height: 20px;
        justify-self: center;
    }
    .pricing-option .radio-circle::after { width: 10px; height: 10px; }
    .pricing-amount {
        grid-column: auto;
        font-size: 1.4rem;
        align-self: center;
        margin-top: 0;
        text-align: right;
        white-space: nowrap;
    }
    .pricing-info .pricing-period { font-size: 1.1rem; margin-bottom: 2px; }
    .pricing-info .pricing-note { font-size: 0.8rem; line-height: 1.2; }
    
    /* 注册弹窗变为单列 */
    .register-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    .register-modal-wide { padding: 30px 25px !important; }
    .register-sidebar h3 { font-size: 1.7rem; text-align: center; }
    .register-privacy-notice { order: -1; margin: 0 0 25px 0; }
    
    /* 按钮大小 */
    .subscribe-btn, .download-btn {
        font-size: 1.2rem;
        padding: 15px 40px;
    }
}

/* 3. 超窄屏 (max-width: 480px) */
@media (max-width: 480px) {
    /* Header 紧凑布局 */
    .header-inner { padding: 0 10px; }
    .header-title { font-size: 1rem; white-space: nowrap; }
    .header-logo { width: 28px; height: 28px; }
    .hero-controls { gap: 5px; }
    .hero-controls #theme-toggle, .hero-controls .hero-lang-selector { font-size: 1rem; }
    
    /* FAQ 搜索栏防溢出 */
    .faq-search-bar { gap: 5px; margin-bottom: 25px; }
    .faq-search-bar input { height: 44px; padding: 0 15px; font-size: 0.9rem; }
    .faq-search-bar button { height: 44px; padding: 0 15px; font-size: 0.9rem; }
}

/* 4. iPhone SE 等微型屏幕 (max-width: 375px) */
@media (max-width: 375px) {
    .pricing-amount { font-size: 1.2rem; }
    .sl-main-title { font-size: 1.4rem; }
}