/* 全局样式 */
:root {
    /* 亮色主题 */
    --primary-color: #333333;
    --secondary-color: #666666;
    --background-color: #ffffff;
    --accent-color: #ff7f00;
    --card-background: #f9f9f9;
    --border-color: #e0e0e0;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

/* 暗色主题 */
body.dark-theme {
    --primary-color: #ffffff;
    --secondary-color: #cccccc;
    --background-color: #1a1a1a;
    --accent-color: #ff9500;
    --card-background: #2d2d2d;
    --border-color: #404040;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--primary-color);
    background-color: var(--background-color);
    transition: all 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部导航 */
header {
    background-color: var(--background-color);
    box-shadow: 0 2px 4px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    padding: 20px 0;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--accent-color);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a:hover {
    color: var(--accent-color);
}

.nav-links a.active {
    color: var(--accent-color);
}

.nav-links a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
}

#theme-toggle {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

#theme-toggle:hover {
    background-color: #e66a00;
}

body.dark-theme #theme-toggle {
    background-color: var(--accent-color);
}

body.dark-theme #theme-toggle:hover {
    background-color: #e68a00;
}

/* 英雄区域 */
.hero {
    padding: 120px 0;
    background-color: var(--background-color);
}

.hero .container {
    display: flex;
    align-items: center;
    gap: 100px;
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-size: 52px;
    margin-bottom: 25px;
    color: var(--primary-color);
    line-height: 1.2;
}

.hero-content h2 {
    font-size: 26px;
    margin-bottom: 40px;
    color: var(--secondary-color);
}

.hero-content p {
    font-size: 18px;
    margin-bottom: 50px;
    color: var(--secondary-color);
    line-height: 1.8;
}

.contact-info {
    display: flex;
    gap: 40px;
    margin-top: 60px;
}

.contact-info p {
    margin: 0;
    font-weight: 500;
    color: var(--primary-color);
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-image img {
    width: 320px;
    height: 420px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 15px 40px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hero-image img:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px var(--shadow-color);
}

/* 作品集区域 */
.portfolio {
    padding: 120px 0;
    background-color: var(--card-background);
}

.portfolio h2 {
    font-size: 40px;
    text-align: center;
    margin-bottom: 80px;
    color: var(--primary-color);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.portfolio-item {
    background-color: var(--background-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 20px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.portfolio-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px var(--shadow-color);
}

.portfolio-item img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.portfolio-item:hover img {
    transform: scale(1.05);
}

.portfolio-item-content {
    padding: 30px;
}

.portfolio-item-content h3 {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.portfolio-item-content p {
    font-size: 16px;
    color: var(--secondary-color);
    line-height: 1.6;
}

/* 工作经历区域 */
.experience {
    padding: 120px 0;
    background-color: var(--background-color);
}

.experience h1 {
    font-size: 40px;
    text-align: center;
    margin-bottom: 80px;
    color: var(--primary-color);
}

.experience-item {
    background-color: var(--card-background);
    border-radius: 12px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 8px 20px var(--shadow-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.experience-item:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 30px var(--shadow-color);
}

.experience-item:hover .experience-header h2 {
    color: var(--accent-color);
    transition: color 0.3s ease;
}

.experience-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.experience-header h2 {
    font-size: 26px;
    color: var(--primary-color);
}

.experience-date {
    font-size: 16px;
    color: var(--accent-color);
    font-weight: 500;
}

.experience-company {
    font-size: 18px;
    color: var(--secondary-color);
    margin-bottom: 25px;
}

.experience-description p {
    margin-bottom: 15px;
    color: var(--secondary-color);
    line-height: 1.6;
}

/* 页脚 */
footer {
    background-color: var(--card-background);
    padding: 40px 0;
    text-align: center;
}

footer p {
    color: var(--secondary-color);
    font-size: 14px;
}

/* 响应式设计 */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
        gap: 60px;
    }

    .hero-content h1 {
        font-size: 36px;
    }

    .hero-content h2 {
        font-size: 20px;
    }

    .contact-info {
        justify-content: center;
    }

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

@media (max-width: 768px) {
    .nav-links {
        gap: 20px;
    }

    .hero {
        padding: 80px 0;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .hero-image img {
        width: 250px;
        height: 333px;
    }

    .portfolio {
        padding: 80px 0;
    }

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

    .experience {
        padding: 80px 0;
    }

    .experience-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
}

@media (max-width: 576px) {
    .nav-links {
        gap: 15px;
    }

    .hero-content h1 {
        font-size: 28px;
    }

    .hero-content h2 {
        font-size: 18px;
    }

    .hero-content p {
        font-size: 16px;
    }

    .contact-info {
        flex-direction: column;
        gap: 10px;
    }

    .portfolio h2,
    .experience h1 {
        font-size: 28px;
    }

    .experience-item {
        padding: 20px;
    }

    .experience-header h2 {
        font-size: 20px;
    }
}