/* ===========================================
   Filesa-COChat 静态网站 - Metro 风格样式
   =========================================== */

/* 1. 变量定义 */
:root {
    --primary-color: #0078d7;
    --primary-color-dark: #005a9e;
    --primary-text-color: white;
    --bg-dark: #171717;
    --bg-card: #2a2a2a;
    --bg-hover: #3e3e3e;
    --text-primary: #ffffff;
    --text-secondary: #a2a2a2;
    --border-color: #333333;
    --accent-green: #27ae60;
    --accent-orange: #f39c12;
    --accent-red: #e74c3c;
    --hue-rotate-deg: 0deg;
}

/* 2. 全局重置和基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 3. 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 4. 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background-color: rgba(23, 23, 23, 0.95);
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 48px;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-logo {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 16px;
    font-size: 14px;
    transition: all 0.2s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-hover);
}

.nav-link-primary {
    background-color: var(--primary-color);
    color: var(--primary-text-color);
}

.nav-link-primary:hover {
    background-color: var(--primary-color-dark);
    filter: brightness(1.1);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 20px;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-toggle:hover {
    color: var(--primary-color);
}

/* 5. 英雄区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 100px 48px 60px;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a1a2e 100%);
    gap: 60px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-title {
    font-size: 48px;
    font-weight: 300;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-title .highlight {
    color: var(--primary-color);
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
}

.hero-badges {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.badge {
    background-color: var(--bg-card);
    color: var(--text-secondary);
    padding: 6px 12px;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 6. 按钮样式 */
.btn {
    display: inline-block;
    padding: 14px 32px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 2px solid var(--text-secondary);
}

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

.btn-large {
    padding: 18px 48px;
    font-size: 16px;
}

/* 7. 应用窗口演示 */
.hero-visual {
    flex: 1;
    max-width: 600px;
}

.app-window {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-color);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    height: 400px;
    max-height: 400px;
}

/* 窗口标题栏 */
.window-header {
    background-color: #2a2a2a;
    padding: 8px 12px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.window-logo {
    width: 20px;
    height: 20px;
    margin-right: 8px;
    object-fit: contain;
}

.window-title {
    flex: 1;
    font-size: 13px;
    color: var(--text-primary);
}

.window-controls {
    display: flex;
    gap: 2px;
}

.window-btn {
    width: 30px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.window-btn:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.window-btn.close:hover {
    background-color: #e74c3c;
    color: white;
}

/* 登录界面 */
.app-login {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-dark);
}

.login-box {
    text-align: center;
    padding: 40px;
}

.login-logo {
    width: 64px;
    height: 64px;
    margin-bottom: 20px;
    object-fit: contain;
}

.login-title {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 30px;
    font-weight: 300;
}

.login-form {
    width: 280px;
    text-align: left;
}

.login-label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.login-input {
    width: 100%;
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: white;
    font-size: 16px;
    padding: 12px 15px;
    outline: none;
    margin-bottom: 20px;
}

.login-input::placeholder {
    color: #74776f;
}

.login-button {
    width: 100%;
    background-color: var(--primary-color);
    color: var(--primary-text-color);
    border: none;
    font-size: 16px;
    padding: 12px;
    cursor: pointer;
    transition: filter 0.2s ease;
}

.login-button:hover {
    filter: brightness(1.1);
}

/* 聊天界面 */
.app-chat {
    flex: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-dark);
    overflow: hidden;
    height: calc(400px - 45px);
}

.chat-main {
    display: flex;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.chat-content-area {
    flex: 1;
    display: flex;
    flex-direction: row;
    overflow: hidden;
    min-height: 0;
    height: calc(100% - 60px);
}

.chat-content-area > .chat-messages-demo {
    flex: 1;
    min-width: 0;
    overflow-y: auto;
    display: block;
    height: 100%;
}

.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100%;
}

.chat-messages-demo {
    flex: 1;
    padding: 15px;
    overflow-y: auto;
    display: block;
    background-color: var(--bg-dark);
    min-height: 0;
    max-height: 100%;
}

.chat-messages-demo > div {
    margin-bottom: 12px;
}

.chat-messages-demo > div:last-child {
    margin-bottom: 0;
}

.msg-system {
    text-align: center;
    background-color: var(--bg-card);
    color: var(--text-secondary);
    padding: 8px 16px;
    font-size: 13px;
    font-style: italic;
    margin: 0 auto 12px;
    display: table;
}

.msg-other {
    max-width: 80%;
    background-color: var(--bg-card);
    border-left: 3px solid var(--primary-color);
    padding: 10px 15px;
    margin-right: auto;
}

.msg-self {
    max-width: 80%;
    background-color: var(--primary-color);
    color: white;
    padding: 10px 15px;
    margin-left: auto;
}

.msg-header {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 4px;
    display: flex;
    gap: 8px;
}

.msg-self .msg-header {
    color: rgba(255, 255, 255, 0.8);
}

.msg-time {
    opacity: 0.7;
}

.msg-content {
    font-size: 14px;
    word-wrap: break-word;
}

.chat-input-demo {
    display: flex;
    padding: 12px 15px;
    background-color: #2a2a2a;
    border-top: 1px solid var(--border-color);
    gap: 10px;
    flex-shrink: 0;
    height: 60px;
}

.chat-input-box {
    flex: 1;
    background-color: transparent;
    border: 1px solid #888;
    color: white;
    font-size: 14px;
    padding: 10px 15px;
    outline: none;
}

.chat-input-box::placeholder {
    color: #74776f;
}

.chat-send {
    background-color: var(--primary-color);
    color: var(--primary-text-color);
    border: none;
    padding: 0 20px;
    cursor: pointer;
    font-size: 14px;
    transition: filter 0.2s ease;
}

.chat-send:hover {
    filter: brightness(1.1);
}

/* 用户列表面板 */
.user-panel {
    width: 140px;
    background-color: #2a2a2a;
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow-y: auto;
    height: 100%;
}

.user-panel-header {
    padding: 12px 15px;
    font-size: 13px;
    font-weight: 600;
    border-bottom: 1px solid var(--border-color);
    background-color: #333;
}

.user-list-demo {
    flex: 1;
    padding: 10px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.user-item-demo {
    padding: 8px 10px;
    font-size: 13px;
    background-color: #333;
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-dot {
    width: 8px;
    height: 8px;
    background-color: #27ae60;
    border-radius: 50%;
    flex-shrink: 0;
}

/* 8. 功能特性区域 */
.features {
    padding: 100px 0;
    background-color: var(--bg-dark);
}

.section-title {
    font-size: 32px;
    font-weight: 300;
    text-align: center;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
}

.feature-card {
    background-color: var(--bg-card);
    padding: 32px;
    border-left: 4px solid var(--primary-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--primary-color);
}

.feature-desc {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

/* 9. 下载区域 */
.download {
    padding: 100px 0;
    background-color: var(--bg-card);
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.download-info h3 {
    font-size: 24px;
    font-weight: 300;
    margin-bottom: 24px;
}

.requirement-list {
    list-style: none;
}

.requirement-list li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.check {
    color: var(--accent-green);
    font-weight: bold;
}

.download-actions {
    text-align: center;
}

.download-note {
    margin-top: 24px;
    color: var(--text-secondary);
    font-size: 14px;
}

.code-block {
    display: block;
    background-color: var(--bg-dark);
    padding: 16px 24px;
    margin-top: 12px;
    font-family: 'Consolas', 'Monaco', monospace;
    color: var(--accent-green);
    border-left: 4px solid var(--accent-green);
    text-align: left;
}

/* 10. 使用指南 */
.usage {
    padding: 100px 0;
    background-color: var(--bg-dark);
}

.usage-steps {
    display: flex;
    flex-direction: column;
    gap: 32px;
    max-width: 800px;
    margin: 0 auto;
}

.usage-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: var(--primary-text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 600;
    flex-shrink: 0;
}

.step-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.6;
}

/* 11. 技术架构 */
.tech {
    padding: 100px 0;
    background-color: var(--bg-card);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 24px;
}

.tech-card {
    background-color: var(--bg-dark);
    padding: 24px;
    border-left: 4px solid var(--accent-orange);
}

.tech-card h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--accent-orange);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tech-card p {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* 12. 常见问题 */
.faq {
    padding: 100px 0;
    background-color: var(--bg-dark);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.faq-item {
    background-color: var(--bg-card);
    padding: 24px;
    border-left: 4px solid var(--accent-green);
}

.faq-question {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.faq-answer {
    color: var(--text-secondary);
    font-size: 14px;
    line-height: 1.6;
}

/* 13. 页脚 */
.footer {
    padding: 60px 0 30px;
    background-color: #0f0f0f;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 24px;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s ease;
}

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

.footer-copyright {
    color: var(--text-secondary);
    font-size: 12px;
    opacity: 0.7;
}

/* 14. 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 120, 215, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(0, 120, 215, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(0, 120, 215, 0);
    }
}

@keyframes ripple {
    to {
        transform: scale(2);
        opacity: 0;
    }
}

/* 15. 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #555;
}

::-webkit-scrollbar-thumb:hover {
    background: #777;
}

/* 16. 响应式设计 */
@media (max-width: 968px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding: 100px 24px 60px;
    }

    .hero-title {
        font-size: 36px;
    }

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

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

    .hero-visual {
        max-width: 100%;
    }

    .download-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .code-block {
        text-align: center;
    }

    .navbar {
        padding: 0 24px;
    }

    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background-color: rgba(23, 23, 23, 0.98);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        border-bottom: 1px solid var(--border-color);
    }

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

    .nav-links .nav-link {
        padding: 15px 20px;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links .nav-link:last-child {
        border-bottom: none;
    }

    .mobile-menu-toggle {
        display: block;
    }
}

@media (max-width: 600px) {
    .features-grid {
        grid-template-columns: 1fr;
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

    .usage-step {
        flex-direction: column;
        text-align: center;
    }

    .step-number {
        margin: 0 auto;
    }

    .hero-title {
        font-size: 28px;
    }
}