/* 全局CSS变量 - 默认主题（暗夜） */
:root {
    /* 颜色体系 - 深蓝青色系 */
    --color-primary: #22d3ee;
    --color-secondary: #10b981;
    --color-accent: #f59e0b;
    --color-background: #0a0f1a;
    --color-surface: #111827;
    --color-text: #e5e7eb;
    --color-text-secondary: #9ca3af;
    --color-border: #1f2937;
    --color-shadow: rgba(0, 0, 0, 0.6);
    --color-overlay: rgba(10, 15, 26, 0.85);

    /* 字体 */
    --font-family: 'HarmonyOS Sans SC', 'Microsoft YaHei', sans-serif;
    --font-weight-normal: 400;
    --font-weight-bold: 700;

    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* 圆角 */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 var(--color-shadow);
    --shadow-md: 0 4px 6px -1px var(--color-shadow);
    --shadow-lg: 0 10px 15px -3px var(--color-shadow);

    /* 动态背景参数 - 深蓝青色渐变 */
    --bg-color-1: #0e7490;
    --bg-color-2: #155e75;
    --bg-color-3: #164e63;
    --bg-blur: 30px;
    --bg-speed: 25s;
}

/* 明亮主题 */
[data-theme="light"] {
    --color-primary: #3b82f6;
    --color-secondary: #10b981;
    --color-accent: #f59e0b;
    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-border: #e2e8f0;
    --color-shadow: rgba(0, 0, 0, 0.1);
    --color-overlay: rgba(248, 250, 252, 0.8);
    --bg-color-1: #60a5fa;
    --bg-color-2: #38bdf8;
    --bg-color-3: #a5f3fc;
}

/* 马卡龙主题 */
[data-theme="macaron"] {
    --color-primary: #f472b6;
    --color-secondary: #a78bfa;
    --color-accent: #fbbf24;
    --color-background: #fef3c7;
    --color-surface: #fdf4ff;
    --color-text: #7c2d12;
    --color-text-secondary: #92400e;
    --color-border: #fbcfe8;
    --color-shadow: rgba(244, 114, 182, 0.3);
    --color-overlay: rgba(254, 243, 199, 0.8);
    --bg-color-1: #f472b6;
    --bg-color-2: #a78bfa;
    --bg-color-3: #fbbf24;
}

/* 莫兰迪主题 */
[data-theme="morandi"] {
    --color-primary: #a8a29e;
    --color-secondary: #94a3b8;
    --color-accent: #d6d3d1;
    --color-background: #f5f5f4;
    --color-surface: #e7e5e4;
    --color-text: #57534e;
    --color-text-secondary: #78716c;
    --color-border: #d6d3d1;
    --color-shadow: rgba(168, 162, 158, 0.3);
    --color-overlay: rgba(245, 245, 244, 0.8);
    --bg-color-1: #a8a29e;
    --bg-color-2: #94a3b8;
    --bg-color-3: #d6d3d1;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-weight: var(--font-weight-normal);
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

a {
    color: inherit;
    text-decoration: none;
}

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

/* 动态背景 */
.dynamic-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(45deg, var(--bg-color-1), var(--bg-color-2), var(--bg-color-3));
    background-size: 400% 400%;
    animation: gradientMove var(--bg-speed) ease infinite;
    filter: blur(var(--bg-blur));
    opacity: 0.7;
}

@keyframes gradientMove {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1400px;
    margin: 0 auto;
}

/* 左侧Logo */
.nav-left .logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-primary);
    font-weight: var(--font-weight-bold);
    font-size: 1.25rem;
}

.logo-svg {
    display: flex;
    align-items: center;
}

.logo-icon {
    color: var(--color-primary);
    transition: color 0.3s ease;
}

.logo-text {
    transition: color 0.3s ease;
}

/* 中间导航按钮 */
.nav-center {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    position: relative;
}

.nav-btn {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: color 0.3s ease, background-color 0.3s ease;
    position: relative;
    z-index: 1;
}

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

.nav-btn.active {
    color: var(--color-primary);
}

.nav-indicator {
    position: absolute;
    height: 100%;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    opacity: 0.1;
    z-index: 0;
    transition: left 0.3s ease, width 0.3s ease;
}

/* 右侧社交图标和主题切换 */
.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.social-icons {
    display: flex;
    gap: var(--spacing-md);
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--color-surface);
    color: var(--color-text);
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease;
}

.social-icon:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.theme-switcher {
    position: relative;
}

.theme-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-full);
    background-color: var(--color-surface);
    color: var(--color-text);
    box-shadow: var(--shadow-sm);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-btn:hover {
    background-color: var(--color-primary);
    color: white;
}

.theme-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    z-index: 1001;
    min-width: 120px;
}

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

.theme-option {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.theme-option:hover {
    background-color: var(--color-primary);
    color: white;
}

/* 主内容 */
.main-content {
    padding-top: 120px;
    padding-bottom: var(--spacing-xxl);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    max-width: 1200px;
    margin: 0 auto;
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent), var(--color-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.2;
    text-align: center;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.btn {
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-full);
    font-weight: 500;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

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

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

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-center {
        order: 3;
        width: 100%;
        justify-content: center;
    }

    .nav-btn {
        padding: var(--spacing-sm) var(--spacing-lg);
    }

    .nav-right {
        order: 2;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .main-content {
        padding-top: 180px;
    }
}