/* ===================================
   极简主义个人主页 - 样式表
   =================================== */

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

:root {
    --primary-color: #000000;
    --secondary-color: #ffffff;
    --accent-color: #666666;
    --border-color: #e0e0e0;
    --spacing-unit: 0.75rem;
    --bg-hover: #f9f9f9;
}

html[data-theme="dark"] {
    --primary-color: #ffffff;
    --secondary-color: #1a1a1a;
    --accent-color: #999999;
    --border-color: #333333;
    --bg-hover: #2a2a2a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.5;
    color: var(--primary-color);
    background-color: var(--secondary-color);
    letter-spacing: 0.2px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* 全局链接颜色过渡 */
a {
    transition: color 0.3s ease;
}

/* ===== 容器 ===== */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 var(--spacing-unit);
}

/* ===== 导航栏 ===== */
.navbar {
    position: sticky;
    top: 0;
    background: var(--secondary-color);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    z-index: 100;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.nav-content {
    max-width: 800px;
    margin: 0 auto;
    padding: calc(var(--spacing-unit) * 0.5) var(--spacing-unit);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--primary-color);
    transition: opacity 0.3s ease, color 0.3s ease;
}

.logo:hover {
    opacity: 0.7;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: calc(var(--spacing-unit) * 1.5);
}

.nav-menu a {
    text-decoration: none;
    color: var(--primary-color);
    font-size: 1.2rem;
    transition: opacity 0.3s ease, color 0.3s ease;
    display: flex;
    align-items: center;
}

.nav-menu a:hover {
    opacity: 0.6;
}

.theme-toggle {
    cursor: pointer;
}

/* ===== 主要区块 ===== */
main {
    min-height: calc(100vh - 150px);
    padding: calc(var(--spacing-unit) * 2) 0;
}

section {
    margin-bottom: calc(var(--spacing-unit) * 3);
    scroll-margin-top: 70px;
    transition: color 0.3s ease, background-color 0.3s ease, border-color 0.3s ease;
}

h2 {
    font-size: 1.25rem;
    margin-bottom: calc(var(--spacing-unit) * 1.5);
    font-weight: 600;
    transition: color 0.3s ease;
}

/* ===== 英雄部分 ===== */
.hero {
    text-align: center;
    padding: calc(var(--spacing-unit) * 2) 0;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: calc(var(--spacing-unit) * 0.75);
    font-weight: 700;
}

.subtitle {
    font-size: 0.95rem;
    color: var(--accent-color);
    font-weight: 400;
}

/* ===== 项目部分 ===== */
.projects {
    padding: 0;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: calc(var(--spacing-unit) * 2);
    margin-top: calc(var(--spacing-unit) * 1.5);
}

.project-card {
    padding: calc(var(--spacing-unit) * 1.5);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    text-align: center;
    text-decoration: none;
    color: var(--primary-color);
    transition: all 0.3s ease;
    background: var(--secondary-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--spacing-unit) * 0.75);
}

.project-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-3px);
    background: var(--bg-hover);
}

.project-icon {
    font-size: 2rem;
    color: var(--primary-color);
    transition: color 0.3s ease;
}

.project-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0;
}

.project-card p {
    color: var(--accent-color);
    font-size: 0.8rem;
    margin: 0;
}

/* ===== 联系部分 ===== */
.contact {
    padding: 0;
}

.contact-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: calc(var(--spacing-unit) * 1.5);
    margin-top: calc(var(--spacing-unit) * 1.5);
}

.contact-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: calc(var(--spacing-unit) * 0.5);
    padding: calc(var(--spacing-unit) * 1.5);
    text-decoration: none;
    color: var(--primary-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: all 0.3s ease;
}

.contact-link:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.contact-link i {
    font-size: 1.5rem;
}

.contact-link span {
    font-size: 0.8rem;
    font-weight: 500;
}

/* ===== 关于部分 ===== */
.about {
    padding: 0;
}

.about p {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--accent-color);
}

/* ===== 页脚 ===== */
.footer {
    border-top: 1px solid var(--border-color);
    padding: calc(var(--spacing-unit) * 2) var(--spacing-unit);
    text-align: center;
    color: var(--accent-color);
    font-size: 0.8rem;
    margin-top: calc(var(--spacing-unit) * 2);
    transition: border-color 0.3s ease, color 0.3s ease;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.1rem;
    }

    .projects-grid {
        grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
        gap: var(--spacing-unit);
    }

    .contact-links {
        grid-template-columns: repeat(2, 1fr);
    }

    .nav-menu {
        gap: var(--spacing-unit);
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1rem;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: calc(var(--spacing-unit) * 0.75);
    }

    .project-card {
        padding: var(--spacing-unit);
    }

    .project-icon {
        font-size: 1.5rem;
    }

    .contact-links {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-unit);
    }

    .contact-link {
        padding: var(--spacing-unit);
    }

    .contact-link i {
        font-size: 1.2rem;
    }

    .contact-link span {
        font-size: 0.75rem;
    }
}

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

section {
    animation: fadeIn 0.6s ease-out;
}

/* ===== 平滑滚动 ===== */
html {
    scroll-behavior: smooth;
}