/**
 * Office2PDF 官方网站样式表
 * 极简清新风格设计
 */

/* ==========================================
   CSS 变量定义
   ========================================== */
:root {
    /* 主色调 - 深蓝渐变 */
    --color-primary: #1E40AF;      /* 深蓝 */
    --color-primary-dark: #1E3A8A;
    --color-primary-light: #2563EB;
    
    /* 辅助色 - 亮蓝 */
    --color-accent: #3B82F6;
    --color-accent-light: #60A5FA;

    /* 背景色 */
    --bg-primary: #FFFFFF;
    --bg-secondary: #EFF6FF;      /* 极淡的蓝色 */
    --bg-tertiary: #DBEAFE;       /* 淡蓝色 */

    /* 文字颜色 */
    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --text-light: #CBD5E1;

    /* 边框颜色 */
    --border-color: #E2E8F0;
    --border-light: #EFF6FF;

    /* 阴影 - 极淡 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.02);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.03), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.04), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 10px 10px -5px rgba(0, 0, 0, 0.02);

    /* 圆角 - 更大更柔和 */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 过渡动画 */
    --transition-fast: 200ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 400ms ease;

    /* 间距 */
    --container-width: 1100px;
    --header-height: 70px;
}

/* ==========================================
   重置样式
   ========================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 
                'Hiragino Sans GB', 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-primary);
    background-color: var(--bg-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input,
textarea,
select {
    font-family: inherit;
    font-size: inherit;
}

/* ==========================================
   工具类
   ========================================== */
.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 32px;
}

/* ==========================================
   按钮样式
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border: 2px solid var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    color: var(--text-primary);
}

.btn-large {
    padding: 16px 36px;
    font-size: 16px;
}

.btn-icon {
    font-size: 18px;
}

/* ==========================================
   下载按钮组样式（多个下载地址）
   ========================================== */
.download-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    /* PC端左对齐，移除居中样式 */
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    cursor: pointer;
    min-width: 160px;
    justify-content: center;
}

/* 主要下载按钮（蓝色） */
.download-btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border: 2px solid var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.download-btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* 备用下载按钮（灰色边框） */
.download-btn-secondary {
    background-color: #FFFFFF;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.download-btn-secondary:hover {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--color-primary-light);
    transform: translateY(-2px);
}

.download-btn-icon {
    font-size: 18px;
}

.download-btn-text {
    font-weight: 600;
}

/* 提取码提示 */
.extract-code-tip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 8px;
}

.extract-code-tip .tip-icon {
    font-size: 16px;
}

.extract-code-tip .tip-btn {
    color: var(--color-primary);
    font-weight: 600;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.extract-code-tip .tip-btn:hover {
    background-color: var(--bg-tertiary);
}

.extract-code-tip strong {
    color: var(--color-primary);
    font-weight: 700;
}

/* 提取码弹窗 */
.extract-code-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    padding: 20px;
}

.extract-code-overlay.is-visible {
    opacity: 1;
    visibility: visible;
}

.extract-code-modal {
    position: relative;
    background-color: #FFFFFF;
    border-radius: var(--radius-xl);
    padding: 40px;
    max-width: 400px;
    width: 100%;
    text-align: center;
    transform: scale(0.95);
    transition: transform var(--transition-base);
    box-shadow: var(--shadow-xl);
}

.extract-code-overlay.is-visible .extract-code-modal {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 20px;
    font-size: 28px;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
}

.modal-code {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 4px;
    padding: 20px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
}

.modal-hint {
    font-size: 13px;
    color: var(--text-tertiary);
    margin-bottom: 24px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.modal-btn {
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    cursor: pointer;
}

.modal-btn:not(.modal-btn-primary) {
    background-color: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.modal-btn:not(.modal-btn-primary):hover {
    background-color: var(--border-color);
}

.modal-btn-primary {
    background-color: var(--color-primary);
    color: #FFFFFF;
    border: 2px solid var(--color-primary);
}

.modal-btn-primary:hover {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
}

.modal-btn.is-copied {
    background-color: #10B981;
    border-color: #10B981;
    color: #FFFFFF;
}

/* ==========================================
   头部导航栏
   ========================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: all var(--transition-base);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow-sm);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 26px;
}

.logo-text {
    color: var(--color-primary);
    font-weight: 700;
}

.nav-menu {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-list a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-list a:hover {
    color: var(--color-primary);
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
}

.menu-toggle.is-active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.is-active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ==========================================
   首屏区域
   ========================================== */
.hero {
    padding: calc(var(--header-height) + 120px) 0 100px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 80px;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 32px;
}

.hero-content {
    max-width: 520px;
}

.hero-title {
    font-size: 44px;
    font-weight: 800;
    line-height: 1.25;
    color: var(--text-primary);
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 17px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 36px;
}

.hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 40px;
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-tertiary);
}

.meta-icon {
    font-size: 16px;
    opacity: 0.7;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.hero-note {
    margin-top: 20px;
    font-size: 13px;
    color: var(--text-light);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.screenshot-container {
    position: relative;
    width: 100%;
    max-width: 480px;
}

.screenshot-placeholder {
    position: relative;
    aspect-ratio: 16 / 10;
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.placeholder-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.placeholder-icon {
    display: block;
    font-size: 56px;
    margin-bottom: 16px;
    opacity: 0.6;
}

.placeholder-text {
    display: block;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.placeholder-hint {
    display: block;
    font-size: 12px;
    color: var(--text-light);
}

.screenshot-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 8px 16px;
    background-color: var(--color-primary);
    color: #FFFFFF;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
}

/* ==========================================
   功能特性区域
   ========================================== */
.features {
    padding: 120px 0;
    background-color: var(--bg-primary);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
    letter-spacing: -0.5px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-tertiary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 32px;
}

.feature-card {
    padding: 32px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 24px;
    margin-bottom: 20px;
    transition: all var(--transition-base);
}

.feature-card:hover .feature-icon {
    background-color: var(--color-primary);
    color: #FFFFFF;
}

.feature-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 14px;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.feature-list li {
    position: relative;
    padding-left: 18px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
}

.feature-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 50%;
}

/* ==========================================
   使用说明区域
   ========================================== */
.guide {
    padding: 100px 0;
    background-color: var(--bg-secondary);
}

.guide-detail {
    max-width: 900px;
    margin: 0 auto 60px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    padding: 0 32px;
}

.guide-item {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 28px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.guide-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.guide-item-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.guide-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 20px;
}

.guide-item-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-primary);
}

.guide-item-content {
    padding: 0;
}

.guide-step {
    position: relative;
    padding-left: 20px;
    font-size: 14px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.guide-step:last-child {
    margin-bottom: 0;
}

.guide-step::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 50%;
}

.guide-note {
    margin-top: 16px;
    padding: 12px 16px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    border-left: 3px solid var(--color-primary);
}

.guide-notes {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 32px;
}

.note-card {
    display: flex;
    gap: 12px;
    padding: 16px 20px;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.note-icon {
    font-size: 18px;
    flex-shrink: 0;
}

.note-content h4 {
    font-size: 13px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.note-content p {
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* ==========================================
   下载区域
   ========================================== */
.download {
    padding: 120px 0;
    background-color: var(--bg-primary);
}

.download-content {
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
    padding: 0 32px;
}

.download-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.download-desc {
    font-size: 15px;
    color: var(--text-tertiary);
    margin-bottom: 32px;
}

.download-desc .js-version {
    font-weight: 700;
    color: var(--color-primary);
}

.download-actions {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
}

.download-meta {
    font-size: 13px;
    color: var(--text-light);
}

.download-meta span {
    font-weight: 600;
    color: var(--text-secondary);
}

/* ==========================================
   页脚
   ========================================== */
.footer {
    padding: 60px 0 30px;
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 32px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 10px;
}

.footer-brand .logo-text {
    color: var(--color-primary);
}

.footer-desc {
    font-size: 13px;
    color: var(--text-light);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-column a {
    font-size: 13px;
    color: var(--text-tertiary);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.copyright {
    font-size: 12px;
    color: var(--text-light);
}

/* ==========================================
   灯箱组件
   ========================================== */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.lightbox.is-visible {
    opacity: 1;
    visibility: visible;
}

.lightbox-content {
    position: relative;
    max-width: 85%;
    max-height: 85%;
    transform: scale(0.95);
    transition: transform var(--transition-base);
}

.lightbox.is-visible .lightbox-content {
    transform: scale(1);
}

.lightbox-content img {
    max-width: 100%;
    max-height: 80vh;
    border-radius: var(--radius-md);
}

.lightbox-close {
    position: absolute;
    top: -44px;
    right: 0;
    font-size: 32px;
    color: #FFFFFF;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
}

.lightbox-close:hover {
    opacity: 1;
}

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
        padding: 0 32px;
    }

    .hero-content {
        max-width: 100%;
        order: 1;
    }

    .hero-title {
        font-size: 38px;
    }

    .hero-meta {
        justify-content: center;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-image {
        order: 0;
    }

    .features-grid {
        gap: 20px;
        padding: 0 32px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 0 32px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .container {
        padding: 0 20px;
    }

    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background-color: var(--bg-primary);
        padding: 20px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.is-active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: 4px;
    }

    .nav-list li {
        width: 100%;
    }

    .nav-list a {
        display: block;
        padding: 12px 16px;
        border-radius: var(--radius-md);
    }

    .nav-list a:hover {
        background-color: var(--bg-secondary);
    }

    .nav-download-btn {
        margin-top: 12px;
        text-align: center;
    }

    .menu-toggle {
        display: flex;
    }

    .hero {
        padding: calc(var(--header-height) + 80px) 0 60px;
    }

    .hero-inner {
        padding: 0 20px;
    }

    .hero-title {
        font-size: 30px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

    .section-title {
        font-size: 26px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        padding: 0 20px;
    }

    .feature-card {
        padding: 24px;
    }

    .guide-detail {
        grid-template-columns: 1fr;
        padding: 0 20px;
    }

    .guide-item {
        padding: 20px;
    }

    .guide-notes {
        padding: 0 20px;
    }

    .download-content {
        padding: 0 20px;
    }

    .footer-content {
        padding: 0 20px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    /* 下载按钮移动端样式 */
    .download-buttons {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .download-btn {
        width: 100%;
        padding: 16px 24px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 26px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn-large {
        padding: 14px 28px;
        font-size: 15px;
        width: 100%;
    }

    .screenshot-placeholder {
        aspect-ratio: 4 / 3;
    }

    .download-title {
        font-size: 24px;
    }
}