:root {
    --primary: #3b82f6;
    --secondary: #8b5cf6;
    --accent: #06b6d4;
    --bg-dark: #0f172a;
    --bg-light: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --glass: rgba(30, 41, 59, 0.8);
    --glow: 0 0 20px rgba(59, 130, 246, 0.3);
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* --- 背景與粒子效果 (已還原) --- */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background:
        radial-gradient(ellipse at top, #1e293b 0%, #0f172a 70%),
        linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
}

.bg-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 25% 25%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 75% 75%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(6, 182, 212, 0.05) 0%, transparent 70%);
    animation: cosmicFloat 25s ease-in-out infinite;
}

@keyframes cosmicFloat {
    0%,
    100% {
        transform: translate(0, 0) rotate(0deg);
        opacity: 1;
    }
    25% { transform: translate(-20px, -30px) rotate(90deg); opacity: 0.8; }
    50% { transform: translate(30px, -10px) rotate(180deg); opacity: 0.6; }
    75% { transform: translate(-10px, 20px) rotate(270deg); opacity: 0.8; }
}

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--primary);
    border-radius: 50%;
    animation: particleFloat 15s linear infinite;
}

/* --- 流星效果 (已還原) --- */
.meteor {
    position: absolute;
    width: 3px;
    height: 3px;
    background: linear-gradient(45deg, #ffffff, #3b82f6);
    border-radius: 50%;
    box-shadow: 0 0 10px #3b82f6;
}

.meteor::before {
    content: '';
    position: absolute;
    width: 150px;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.8), transparent);
    top: 50%;
    right: 100%;
    transform: translateY(-50%);
}

.meteor-1 { top: 10%; left: -150px; animation: meteor1 8s linear infinite; }
.meteor-2 { top: 30%; left: -150px; animation: meteor2 12s linear infinite 3s; }
.meteor-3 { top: 60%; left: -150px; animation: meteor3 10s linear infinite 6s; }
.meteor-4 { top: 80%; left: -150px; animation: meteor4 9s linear infinite 1.5s; }

@keyframes meteor1 {
    0% { transform: translateX(0) translateY(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateX(calc(100vw + 150px)) translateY(200px); opacity: 0; }
}
@keyframes meteor2 {
    0% { transform: translateX(0) translateY(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateX(calc(100vw + 150px)) translateY(300px); opacity: 0; }
}
@keyframes meteor3 {
    0% { transform: translateX(0) translateY(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateX(calc(100vw + 150px)) translateY(150px); opacity: 0; }
}
@keyframes meteor4 {
    0% { transform: translateX(0) translateY(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateX(calc(100vw + 150px)) translateY(250px); opacity: 0; }
}

@keyframes particleFloat {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { transform: translateY(90vh) scale(1); opacity: 1; }
    90% { transform: translateY(-10vh) scale(1); opacity: 1; }
    100% { transform: translateY(-10vh) scale(0); opacity: 0; }
}

/* --- 新增：左側導覽列 --- */
.sidebar {
    position: fixed;
    top: 0;
    left: -250px;
    width: 220px;
    height: 100vh;
    background: var(--bg-light);
    border-right: 1px solid rgba(59, 130, 246, 0.15);
    z-index: 1000;
    transition: left 0.4s ease-in-out;
    padding-top: 6rem;
    box-shadow: 5px 0 25px rgba(0, 0, 0, 0.3);
}
.sidebar.open { left: 0; }
.sidebar-nav { display: flex; flex-direction: column; }
.nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    border-left: 4px solid transparent;
    transition: all 0.3s ease;
}
.nav-link:hover {
    background: rgba(59, 130, 246, 0.1);
    color: var(--text-primary);
    border-left-color: var(--primary);
}
.nav-link i {
    width: 20px;
    text-align: center;
    color: var(--accent);
    transition: color 0.3s ease;
}
.nav-link:hover i { color: var(--primary); }

/* --- 新增：主內容包裝 --- */
.main-wrapper {
    transition: margin-left 0.4s ease-in-out;
}
body.sidebar-open .main-wrapper {
    margin-left: 220px;
}

/* --- Header & 新增：導覽列按鈕 --- */
.header {
    padding: 1rem 0;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid rgba(59, 130, 246, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.sidebar-toggle {
    position: fixed;
    top: 20px;
    left: 20px;
    background: none;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: var(--text-secondary);
    font-size: 1.2rem;
    cursor: pointer;
    z-index: 1001;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}
.sidebar-toggle:hover {
    color: var(--primary);
    border-color: var(--primary);
    transform: rotate(90deg);
}

.header-content {
    display: flex;
    align-items: center;
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.profile-img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.4);
    flex-shrink: 0;
    overflow: hidden;
}
.profile-img img { width: 100%; height: 100%; object-fit: cover; }
.name {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.3rem;
}
.contact-info {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    align-items: center;
}
.contact-item {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    font-size: 0.9rem;
    white-space: nowrap;
}
.contact-item:hover {
    color: var(--primary);
    transform: translateY(-2px);
}
.contact-item a { color: var(--text-secondary); text-decoration: none; transition: color 0.3s ease; }
.contact-item a:hover { color: var(--primary); }

/* --- 主內容 --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.section {
    margin: 3rem 0;
    padding: 2rem;
    background: rgba(30, 41, 59, 0.3);
    backdrop-filter: blur(15px);
    border-radius: 20px;
    border: 1px solid rgba(59, 130, 246, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}
.section:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.2);
}
.section-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}
.section-title i { color: var(--primary); font-size: 1.5rem; }

/* --- 您保留的其他 Class (已還原) --- */
.skill-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}
.skill-category {
    background: rgba(59, 130, 246, 0.08);
    padding: 1.5rem;
    border-radius: 15px;
    border: 1px solid rgba(59, 130, 246, 0.1);
    backdrop-filter: blur(10px);
}
.skill-category h3 {
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}
.skill-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.skill-tag {
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    color: white;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s ease;
}
.skill-tag:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}
.experience-item, .education-item {
    background: rgba(139, 92, 246, 0.08);
    padding: 1.5rem;
    border-radius: 15px;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--secondary);
    border: 1px solid rgba(139, 92, 246, 0.1);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}
.experience-item:hover, .education-item:hover {
    transform: translateX(10px);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.2);
}
.exp-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}
.exp-title { font-size: 1.2rem; font-weight: 600; color: var(--primary); }
.exp-company { font-weight: 500; color: var(--text-secondary); }
.exp-date { color: var(--accent); font-size: 0.9rem; font-weight: 500; }
.exp-description { color: var(--text-secondary); line-height: 1.8; }

/* --- 專案作品 --- */
.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}
.project-card {
    background: rgba(59, 130, 246, 0.08);
    padding: 1.5rem;
    border-radius: 20px;
    border: 1px solid rgba(59, 130, 246, 0.1);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}
.project-card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 40px rgba(59, 130, 246, 0.3);
}

/* 新增的專案分類標題 */
.project-category {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 0.75rem;
    align-self: flex-start;
    padding: 0.2rem 0.8rem;
    background: rgba(6, 182, 212, 0.15);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 20px;
}

.project-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 1rem;
}
.project-card p { color: var(--text-secondary); flex-grow: 1; }
.project-tech { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.5rem; }
.tech-tag {
    background: rgba(6, 182, 212, 0.2);
    color: var(--accent);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.8rem;
    border: 1px solid rgba(6, 182, 212, 0.3);
}

/* --- 其他元件 (讀取、安裝按鈕) --- */
.loading {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-dark);
    display: flex; justify-content: center; align-items: center;
    z-index: 2000;
    transition: opacity 0.5s ease;
}
.loading.hidden { opacity: 0; pointer-events: none; }
.loader {
    width: 50px; height: 50px;
    border: 3px solid rgba(59, 130, 246, 0.3);
    border-top: 3px solid var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.install-btn {
    position: fixed; bottom: 20px; right: 20px;
    background: linear-gradient(45deg, var(--primary), var(--secondary));
    color: white; border: none; padding: 1rem; border-radius: 50%;
    font-size: 1.5rem; cursor: pointer;
    box-shadow: var(--glow);
    transition: all 0.3s ease;
    z-index: 999;
    display: none;
}
.install-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 0 30px rgba(59, 130, 246, 0.5);
}
.install-btn.show { display: block; }

/* --- 響應式設計 --- */
@media (max-width: 900px) {
    body.sidebar-open .main-wrapper { margin-left: 0; }
    .header-content { justify-content: center; }
    .profile-section { margin-left: 40px; }
}
@media (max-width: 768px) {
    .container { padding: 0 1rem; }
    .name { font-size: 1.8rem; }
    .contact-info { gap: 1rem; justify-content: center; }
    .section { padding: 1.5rem; }
    .skill-grid { grid-template-columns: 1fr; }
    .project-grid { grid-template-columns: 1fr; }
    .exp-header { flex-direction: column; gap: 0.5rem; }
}