/* ============================================
   设计灵感转译说明
   ============================================ */


/* ============================================
   CSS变量系统 - 基于DeepSeek风格优化
   ============================================ */
:root {


    --deepseek-bg: #f7f7f8;
    --deepseek-sidebar: #ffffff;
    --deepseek-primary: #10a37f;
    --deepseek-primary-hover: #0d8c6d;
    --deepseek-border: #e5e5e5;
    --deepseek-text: #374151;
    --deepseek-text-secondary: #6b7280;
    --deepseek-hover: #f7f7f8;
    --deepseek-active: #e6f4ea;
    --deepseek-shadow: 0 0 15px rgba(0, 0, 0, 0.1);
    --deepseek-radius: 12px;
    --deepseek-radius-sm: 8px;
    --deepseek-danger: #ef4444;
    /* 色彩系统 - 极简单色调 */
    --color-bg: #ffffff;
    --color-bg-alt: #f8f9fa;
    --color-surface: #ffffff;
    --color-border: #e9ecef;
    --color-border-hover: #d0d7de;

    /* 主色调 - DeepSeek风格 */
    --color-primary: #10a37f;
    --color-primary-light: rgba(16, 163, 127, 0.1);
    --color-primary-dark: #0d8c6d;

    /* 文本颜色 */
    --color-text: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-text-inverse: #ffffff;

    /* 语义颜色 */
    --color-success: #10a37f;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* 间距系统 - 基于8px网格 */
    --space-1: 0.25rem;
    /* 4px */
    --space-2: 0.5rem;
    /* 8px */
    --space-3: 0.75rem;
    /* 12px */
    --space-4: 1rem;
    /* 16px */
    --space-6: 1.5rem;
    /* 24px */
    --space-8: 2rem;
    /* 32px */
    --space-12: 3rem;
    /* 48px */
    --space-16: 4rem;
    /* 64px */

    /* 圆角系统 - Jony Ive式人体工学 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
    --radius-pill: 9999px;

    /* 阴影系统 - 体块感叠合 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-elevation:
        0 2.8px 2.2px rgba(0, 0, 0, 0.02),
        0 6.7px 5.3px rgba(0, 0, 0, 0.028),
        0 12.5px 10px rgba(0, 0, 0, 0.035);

    /* 过渡动画 - 精心调校的时长 */
    --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* 响应式断点 */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;

    /* 字体系统 - 变量字体支持 */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
        'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono',
        'Ubuntu Mono', monospace;

    /* 布局约束 */
    --container-max: 1280px;
    --sidebar-width: 280px;
    --header-height: 72px;
}

/* ============================================
   基础重置与全局样式
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
}

/* 支持减少运动 */
@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================
   非对称布局系统
   ============================================ */
.site-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    grid-template-rows: var(--header-height) 1fr;
    min-height: 100vh;
    max-width: var(--container-max);
    margin: 0 auto;
    position: relative;
}

/* 破格元素 - 在网格秩序中创造惊喜 */
.layout-breakout {
    grid-column: 1 / -1;
    margin-left: calc(var(--sidebar-width) * -0.5);
    margin-right: calc(var(--space-12) * -1);
}

/* ============================================
   新版头部设计
   ============================================ */
.site-header {
    margin: 0 auto;
    max-width: 1400px;
    grid-column: 1 / -1;
    grid-row: 1;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0 var(--space-6);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

/* Logo区域 - 曲线切割设计 */
.header-logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-container {
    position: relative;
    width: 44px;
    height: 44px;
}

.logo-shape {
    width: 100%;
    height: 100%;
    position: relative;
    overflow: hidden;
    transform: rotate(-2deg);
    transition: var(--transition-base);
}

.logo-shape img {
    width: 100%;
    height: 100%;
}



.logo-shape::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -30%;
    width: 60%;
    height: 60%;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    clip-path: circle(50% at 50% 50%);
}

.logo-container:hover .logo-shape {
    transform: rotate(2deg) scale(1.05);
}

.logo-text {
    font-weight: 600;
    font-size: 1.25rem;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-text), var(--color-text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 超大标题支持 */
.title-xxl {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin: 0;
}

.title-xl {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

/* 导航菜单 - 模块化卡片设计 */
.header-nav {
    display: flex;
    gap: var(--space-2);
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-pill);
    text-decoration: none;
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--color-primary);
    opacity: 0;
    transition: var(--transition-base);
    border-radius: inherit;
}

.nav-link .nav-text {
    position: relative;
    z-index: 1;
}

.nav-link .nav-icon {
    position: relative;
    z-index: 1;
    font-size: 1rem;
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text);
    transform: translateY(-1px);
}

.nav-link:hover::before {
    opacity: 0.05;
}

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

.nav-link.active::before {
    opacity: 0;
}

.nav-link.active .nav-icon {
    transform: scale(1.1);
}

/* 细微纹理背景 */
.texture-subtle {
    background-image:
        radial-gradient(circle at 15% 50%, rgba(0, 0, 0, 0.02) 0%, transparent 20%),
        radial-gradient(circle at 85% 30%, rgba(0, 0, 0, 0.02) 0%, transparent 20%);
    background-size: 200% 200%;
    animation: texture-drift 60s ease-in-out infinite;
}

@keyframes texture-drift {

    0%,
    100% {
        background-position: 0% 0%;
    }

    50% {
        background-position: 100% 100%;
    }
}

/* 用户区域 - 体块叠合设计 */
.header-user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    cursor: pointer;
    transition: var(--transition-base);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
}

.user-avatar::after {
    content: '';
    position: absolute;
    inset: 0;
    border: 2px solid transparent;
    border-radius: inherit;
    background: linear-gradient(135deg, var(--color-primary), transparent) border-box;
    -webkit-mask:
        linear-gradient(#fff 0 0) padding-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: var(--transition-base);
}

.user-avatar:hover::after {
    opacity: 1;
}

.user-avatar:hover {
    transform: translateY(-2px) scale(1.05);
}

.avatar-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.avatar-default {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: var(--color-primary);
    font-size: 1rem;
}

/* 登录/注册按钮 - 极简符号设计 */
.auth-buttons {
    width: 140px;
    display: flex;
    gap: var(--space-2);
}

.btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 0.875rem;
    text-decoration: none;
    border: none;
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: currentColor;
    opacity: 0;
    transition: var(--transition-base);
}

.btn .btn-text {
    position: relative;
    z-index: 1;
}

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

.btn-login:hover {
    color: var(--color-text);
    border-color: var(--color-border-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-register {
    color: var(--color-text-inverse);
    background: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-register:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* 下拉菜单 - 曲线切割设计 */
.user-dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    width: 280px;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
    padding: var(--space-4) 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition-base);
    z-index: 1000;
    clip-path: polygon(0% 0%,
            100% 0%,
            100% calc(100% - 20px),
            calc(100% - 20px) 100%,
            20px 100%,
            0% calc(100% - 20px));
}

.user-dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-header {
    padding: 0 var(--space-4) var(--space-4);
    border-bottom: 1px solid var(--color-border);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--color-text);
    text-decoration: none;
    transition: var(--transition-fast);
    position: relative;
}

.dropdown-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--color-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    transition: var(--transition-base);
}

.dropdown-item:hover {
    background: var(--color-bg-alt);
    padding-left: var(--space-6);
}

.dropdown-item:hover::before {
    height: 60%;
}

/* 等宽数字样式 */
.mono-numbers {
    font-feature-settings: "tnum";
    font-variant-numeric: tabular-nums;
    font-family: var(--font-mono);
    font-weight: 500;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .site-container {
        grid-template-columns: 1fr;
    }

    .site-header {
        padding: 0 var(--space-4);
    }

    .header-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        width: 24px;
        height: 18px;
        background: transparent;
        border: none;
        cursor: pointer;
        padding: 0;
    }

    .mobile-menu-btn span {
        width: 100%;
        height: 2px;
        background: var(--color-text);
        border-radius: 1px;
        transition: var(--transition-base);
    }

    .mobile-menu-btn.active span:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }

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

    .mobile-menu-btn.active span:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
}

/* 响应式标题调整 */
@media (max-width: 640px) {
    .title-xxl {
        font-size: clamp(2rem, 6vw, 3rem);
    }

    .title-xl {
        font-size: clamp(1.75rem, 5vw, 2.5rem);
    }

    .logo-text {
        font-size: 1rem;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0a0a0a;
        --color-bg-alt: #1a1a1a;
        --color-surface: #161616;
        --color-border: #2a2a2a;
        --color-border-hover: #404040;
        --color-text: #ffffff;
        --color-text-secondary: #a0a0a0;
        --color-text-tertiary: #666666;
    }

    .site-header {
        background: rgba(16, 16, 16, 0.95);
    }

    .texture-subtle {
        background-image:
            radial-gradient(circle at 15% 50%, rgba(255, 255, 255, 0.02) 0%, transparent 20%),
            radial-gradient(circle at 85% 30%, rgba(255, 255, 255, 0.02) 0%, transparent 20%);
    }
}