/* --- 1. 变量与全局样式 --- */
:root {
    --bg-color: #111111;
    --card-color: #1C1C1C;
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #FFFFFF;
    --text-secondary: #A3A3A3;
    --accent-color: #BEF264; /* 亮绿色 */
    --accent-text-color: #111111;
    --font-family: 'Inter', sans-serif;
    --card-radius: 24px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    background-image: linear-gradient(var(--border-color) 1px, transparent 1px), linear-gradient(to right, var(--border-color) 1px, transparent 1px);
    background-size: 40px 40px;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }

/* --- 2. 通用组件 (按钮, 卡片, 标题) --- */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 99px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: 1px solid transparent;
}
.btn-primary { background-color: var(--accent-color); color: var(--accent-text-color); }
.btn-primary:hover { transform: scale(1.05); }
.btn-secondary { border: 1px solid var(--border-color); color: var(--text-primary); }
.btn-secondary:hover { background-color: var(--text-primary); color: var(--bg-color); }

.card {
    background-color: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    padding: 2.5rem;
}

.section-title { font-size: 3rem; font-weight: 600; margin-bottom: 0.5rem; }
.section-subtitle { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 2.5rem; }


/* --- 3. 模块样式 --- */
/* Hero */
.hero { text-align: center; padding: 8rem 0; }
.hero-title {font-size:3.5rem;max-width:none;margin:0 auto 2rem;line-height:1.2;white-space:nowrap}
.hero-buttons { display: flex; justify-content: center; gap: 1rem; }

/* About */
.about { margin-bottom: 4rem; }
.about .card { text-align: center; }
.about-text { font-size: 1.5rem; line-height: 1.6; color: var(--text-secondary); margin-bottom: 3rem; }
.stats { display: flex; justify-content: space-around; border-top: 1px solid var(--border-color); padding-top: 2rem; }
.stat-item { display: flex; flex-direction: column; }
.stat-number { font-size: 3rem; font-weight: 600; color: var(--accent-color); }
.stat-label { color: var(--text-secondary); }

/* Skills */
.skills { padding: 4rem 0; }
.skills-columns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.skill-category h3 { font-size: 1.25rem; margin-bottom: 1.5rem; color: var(--text-secondary); }
.skill-category ul { list-style: none; }
.skill-category li { font-size: 1.5rem; font-weight: 500; margin-bottom: 1rem; }

/* Projects */
.projects { padding: 4rem 0; }
.section-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 2rem; }
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.project-card { background: var(--card-color); border-radius: var(--card-radius); overflow: hidden; border: 1px solid var(--border-color); transition: var(--transition); display: flex; flex-direction: column; text-decoration: none; color: inherit;}
.project-card:hover { transform: translateY(-10px); border-color: var(--accent-color); }
.project-image-wrapper{background:#fff;padding:1rem;border-radius:var(--card-radius) var(--card-radius) 0 0;flex-shrink:0;height:220px;overflow:hidden;display:flex;align-items:center;justify-content:center}
.project-image-wrapper img{width:100%;display:block;border-radius:calc(var(--card-radius) - 1rem);height:100%;object-fit:cover;object-position:center}
.project-info { padding: 1.5rem; display: flex; flex-direction: column; flex-grow: 1;}
.project-title { font-size: 1.2rem; font-weight: 600; margin-bottom: 0.5rem;}
.project-description {font-size:0.9rem;color:var(--text-secondary);line-height:1.6;flex-grow:1;margin-bottom:1rem}
.project-tags{display:flex;gap:0.5rem}
.tag{background-color:var(--bg-color);color:var(--text-secondary);padding:0.3rem 0.8rem;border-radius:99px;font-size:0.8rem}

/* Contact (新) */
.contact { padding: 4rem 0; text-align: center; }
.contact-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; text-align: left; }
.contact-card {
    display: block;
    text-decoration: none;
    color: var(--text-primary);
    background-color: var(--card-color);
    border: 1px solid var(--border-color);
    border-radius: var(--card-radius);
    padding: 2rem;
    transition: var(--transition);
}
.contact-card:hover { transform: translateY(-10px); border-color: var(--accent-color); }
.contact-card i { font-size: 1.8rem; color: var(--accent-color); margin-bottom: 1.5rem; display: block; }
.contact-card h3 { font-size: 1.25rem; margin-bottom: 0.25rem; }
.contact-card span { color: var(--text-secondary); font-size: 1rem; }


/* Footer */
.footer { padding: 4rem 0 2rem; }
.footer-bottom { border-top: 1px solid var(--border-color); padding-top: 2rem; color: var(--text-secondary); font-size: 0.9rem; text-align: center; }

/* --- 4. 动画 & 响应式 --- */
.animated-section { opacity: 0; transform: translateY(50px); transition: opacity 0.8s ease-out, transform 0.8s ease-out; }
.animated-section.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 768px) {
    .section-title, .hero-title, .stat-number { font-size: 2.2rem; }
    .about-text, .skill-category li { font-size: 1.1rem; }
    .stats { flex-direction: column; gap: 2rem; }
    .skills-columns { grid-template-columns: 1fr; }
}