/* ============================================
   陈彦坤 - 个人网站样式表
   ============================================ */

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 60px;
    position: relative;
    color: #1a1a2e;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(135deg, #f97316, #fb923c);
    border-radius: 2px;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    text-decoration: none;
    color: #1a1a2e;
    letter-spacing: -1px;
}

.logo-accent {
    color: #f97316;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: #555;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #f97316;
    transition: width 0.3s ease;
}

.nav-links a:hover,
.nav-links a.active {
    color: #f97316;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
}

.hamburger span {
    width: 25px;
    height: 2px;
    background: #333;
    transition: all 0.3s ease;
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #fef9f4 0%, #fff7ed 50%, #fef3e7 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(249, 115, 22, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -20%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(251, 146, 60, 0.06) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-content {
    max-width: 720px;
    position: relative;
    z-index: 1;
}

.hero-greeting {
    font-size: 1.2rem;
    color: #f97316;
    font-weight: 600;
    margin-bottom: 12px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.hero-name {
    font-size: 4.5rem;
    font-weight: 800;
    color: #1a1a2e;
    line-height: 1.1;
    margin-bottom: 16px;
    letter-spacing: -2px;
}

.hero-title {
    font-size: 1.4rem;
    color: #666;
    font-weight: 400;
    margin-bottom: 20px;
}

.hero-desc {
    font-size: 1.1rem;
    color: #777;
    line-height: 1.8;
    margin-bottom: 36px;
    max-width: 540px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, #f97316, #fb923c);
    color: white;
    box-shadow: 0 4px 15px rgba(249, 115, 22, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(249, 115, 22, 0.4);
}

.btn-secondary {
    background: transparent;
    color: #333;
    border: 2px solid #ddd;
}

.btn-secondary:hover {
    border-color: #f97316;
    color: #f97316;
    transform: translateY(-2px);
}

.hero-social {
    display: flex;
    gap: 20px;
}

.hero-social a {
    color: #999;
    font-size: 1.4rem;
    transition: all 0.3s ease;
}

.hero-social a:hover {
    color: #f97316;
    transform: translateY(-3px);
}

/* ============================================
   关于我
   ============================================ */
.about {
    padding: 120px 0;
    background: #ffffff;
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-text p {
    color: #666;
    font-size: 1.05rem;
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 32px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: #f8f9fa;
    border-radius: 12px;
    font-size: 0.9rem;
    color: #555;
}

.info-item i {
    color: #f97316;
    font-size: 1.1rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    padding: 40px;
    background: linear-gradient(135deg, #fff7ed, #fef3e7);
    border-radius: 20px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.8rem;
    font-weight: 800;
    background: linear-gradient(135deg, #f97316, #fb923c);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.stat-label {
    color: #888;
    font-size: 0.9rem;
    font-weight: 500;
}

/* ============================================
   技能
   ============================================ */
.skills {
    padding: 120px 0;
    background: #f8f9fa;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.skill-card {
    background: white;
    padding: 36px 28px;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #f0f0f0;
}

.skill-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
    border-color: #f97316;
}

.skill-card i {
    font-size: 2.5rem;
    color: #f97316;
    margin-bottom: 20px;
}

.skill-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: #1a1a2e;
}

.skill-card p {
    color: #888;
    font-size: 0.9rem;
    margin-bottom: 20px;
    line-height: 1.6;
}

.skill-bar {
    width: 100%;
    height: 6px;
    background: #f0f0f0;
    border-radius: 3px;
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: linear-gradient(135deg, #f97316, #fb923c);
    border-radius: 3px;
    transition: width 1.5s ease;
}

/* ============================================
   项目
   ============================================ */
.projects {
    padding: 120px 0;
    background: #ffffff;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.project-card {
    background: white;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid #f0f0f0;
    transition: all 0.3s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}

.project-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #fff7ed, #fef3e7);
}

.project-image i {
    font-size: 4rem;
    color: #f97316;
    opacity: 0.7;
}

.project-info {
    padding: 28px;
}

.project-info h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: #1a1a2e;
}

.project-info p {
    color: #888;
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 16px;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.project-tags span {
    padding: 4px 14px;
    background: #fff7ed;
    color: #f97316;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
}

.project-link {
    color: #f97316;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap 0.3s ease;
}

.project-link:hover {
    gap: 12px;
}

/* ============================================
   联系
   ============================================ */
.contact {
    padding: 120px 0;
    background: #f8f9fa;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 24px;
    background: white;
    border-radius: 16px;
    border: 1px solid #f0f0f0;
    transition: all 0.3s ease;
}

.contact-item:hover {
    border-color: #f97316;
    transform: translateX(4px);
}

.contact-item i {
    font-size: 1.5rem;
    color: #f97316;
    margin-top: 2px;
}

.contact-item h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 4px;
    color: #333;
}

.contact-item p {
    color: #888;
    font-size: 0.9rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid #eee;
    border-radius: 12px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: white;
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: #f97316;
    box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.contact-form .btn {
    align-self: flex-start;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: #1a1a2e;
    color: #999;
    padding: 32px 0;
}

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

.footer p {
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: #666;
    font-size: 1.2rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #f97316;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .skills-grid,
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .hero-name {
        font-size: 3rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .skills-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        padding: 24px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer .container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .section-title {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.2rem;
    }

    .hero-title {
        font-size: 1.1rem;
    }

    .about-info {
        grid-template-columns: 1fr;
    }

    .about-stats {
        grid-template-columns: 1fr;
        gap: 16px;
    }
}