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

:root {
    --primary: #8B5CF6;
    --light: #A78BFA;
    --lightest: #C4B5FD;
    --primary-rgb: 139, 92, 246;
    --light-rgb: 167, 139, 250;
    --bg-dark: #0F0F1A;
    --bg-card: #1A1A2E;
    --bg-card-hover: #252542;
    --text-white: #FFFFFF;
    --text-gray: #A1A1AA;
    --text-light: #D4D4D8;
    --border-color: rgba(var(--primary-rgb), 0.15);
}

body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.8;
    min-height: 100vh;
    overflow-x: hidden;
    transition: background-color 0.4s ease, color 0.4s ease;
}

body.light-mode {
    --bg-dark: #F8F7FF;
    --bg-card: #FFFFFF;
    --bg-card-hover: #F0F0FF;
    --text-white: #1F1B24;
    --text-gray: #6B7280;
    --text-light: #9CA3AF;
    --border-color: rgba(var(--primary-rgb), 0.1);
}

body.style-blue {
    --primary: #3B82F6;
    --light: #60A5FA;
    --lightest: #93C5FD;
    --primary-rgb: 59, 130, 246;
    --light-rgb: 96, 165, 250;
    --border-color: rgba(var(--primary-rgb), 0.15);
}

body.style-blue.light-mode {
    --border-color: rgba(var(--primary-rgb), 0.1);
}

body.style-yellow {
    --primary: #F59E0B;
    --light: #FBBF24;
    --lightest: #FCD34D;
    --primary-rgb: 245, 158, 11;
    --light-rgb: 251, 191, 36;
    --border-color: rgba(var(--primary-rgb), 0.15);
}

body.style-yellow.light-mode {
    --border-color: rgba(var(--primary-rgb), 0.1);
}

.bg-pattern {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, rgba(var(--primary-rgb), 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(var(--light-rgb), 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(var(--primary-rgb), 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: 0;
    animation: bgPulse 8s ease-in-out infinite;
}

body.light-mode .bg-pattern {
    background: 
        radial-gradient(circle at 20% 20%, rgba(var(--primary-rgb), 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(var(--light-rgb), 0.06) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(var(--primary-rgb), 0.03) 0%, transparent 70%);
}

@keyframes bgPulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 15, 26, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    transform: translateY(0);
}

nav.scrolled {
    background: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(25px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    padding: 8px 0;
}

body.light-mode nav {
    background: rgba(255, 255, 255, 0.85);
}

body.light-mode nav.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 26px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.logo::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 30%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--light));
    border-radius: 2px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 25px;
}

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

.nav-links a {
    color: var(--text-gray);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 8px 0;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--light));
    border-radius: 2px;
    transition: width 0.3s ease;
}

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

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    background: rgba(var(--primary-rgb), 0.15);
    border: 1px solid rgba(var(--primary-rgb), 0.3);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
    color: var(--text-gray);
}

.nav-btn:hover {
    background: rgba(var(--primary-rgb), 0.25);
    border-color: var(--primary);
    color: var(--lightest);
    transform: translateY(-2px);
}

body.light-mode .nav-btn {
    background: rgba(var(--primary-rgb), 0.1);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 120px 30px 60px;
    position: relative;
    z-index: 1;
}

.section {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 45px;
    margin-bottom: 35px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    opacity: 0;
    transform: translateY(40px) scale(0.98);
}

.section.visible {
    opacity: 1;
    transform: translateY(0) scale(1);
}

body.light-mode .section {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.section:hover {
    border-color: rgba(var(--primary-rgb), 0.3);
    transform: translateY(-2px);
}

.section-title {
    font-size: 26px;
    font-weight: 700;
    margin-bottom: 35px;
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--text-white);
}

.section-title::before {
    content: '';
    width: 4px;
    height: 28px;
    background: linear-gradient(180deg, var(--primary), var(--light));
    border-radius: 2px;
    box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.5);
}

.profile-header {
    display: flex;
    gap: 50px;
    align-items: center;
}

.avatar-wrapper {
    position: relative;
}

.avatar {
    width: 220px;
    height: 220px;
    border-radius: 24px;
    object-fit: cover;
    box-shadow: 0 10px 40px rgba(var(--primary-rgb), 0.4), 0 0 60px rgba(var(--primary-rgb), 0.2);
    transition: all 0.4s ease;
    position: relative;
    border: 3px solid rgba(var(--primary-rgb), 0.3);
}

.avatar::before {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 28px;
    background: linear-gradient(135deg, var(--primary), var(--light));
    opacity: 0.3;
    z-index: -1;
    animation: avatarGlow 3s ease-in-out infinite;
}

@keyframes avatarGlow {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.02); }
}

.avatar:hover {
    transform: scale(1.03);
    box-shadow: 0 15px 50px rgba(var(--primary-rgb), 0.5), 0 0 80px rgba(var(--primary-rgb), 0.3);
}

.profile-info {
    flex: 1;
}

.profile-info h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--text-white), var(--light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.profile-title {
    color: var(--light);
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 25px;
    letter-spacing: 2px;
}

.profile-desc {
    color: var(--text-gray);
    font-size: 16px;
    line-height: 2;
    text-align: justify;
    background: rgba(var(--primary-rgb), 0.05);
    padding: 20px;
    border-radius: 12px;
    border-left: 3px solid var(--primary);
}

body.light-mode .profile-desc {
    background: rgba(var(--primary-rgb), 0.03);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 35px;
}

.stat-card {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--light-rgb), 0.05));
    border-radius: 16px;
    padding: 25px;
    text-align: center;
    border: 1px solid rgba(var(--primary-rgb), 0.15);
    transition: all 0.3s ease;
    opacity: 0;
    transform: scale(0.9);
}

.stat-card.visible {
    opacity: 1;
    transform: scale(1);
}

.stat-card:hover {
    transform: translateY(-5px);
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.15), rgba(var(--light-rgb), 0.1));
    border-color: rgba(var(--primary-rgb), 0.3);
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-gray);
    font-weight: 500;
}

.timeline {
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 28px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary), var(--light), rgba(var(--light-rgb), 0.3));
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    padding-left: 70px;
    margin-bottom: 50px;
    opacity: 0;
    transform: translateX(-30px);
}

.timeline-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: 20px;
    top: 6px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary);
    border: 4px solid var(--bg-card);
    box-shadow: 0 0 15px rgba(var(--primary-rgb), 0.5);
    transition: all 0.3s ease;
}

.timeline-item:hover .timeline-dot {
    transform: scale(1.2);
    box-shadow: 0 0 25px rgba(var(--primary-rgb), 0.8);
}

.timeline-year {
    font-size: 15px;
    color: var(--light);
    font-weight: 600;
    margin-bottom: 10px;
    letter-spacing: 1px;
}

.timeline-title {
    font-size: 19px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-white);
    transition: color 0.3s ease;
}

.timeline-item:hover .timeline-title {
    color: var(--light);
}

.timeline-desc {
    color: var(--text-gray);
    font-size: 15px;
    line-height: 1.8;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 28px;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 20px;
    background: rgba(var(--primary-rgb), 0.05);
    border-radius: 14px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
}

.skill-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-item:hover {
    background: rgba(var(--primary-rgb), 0.1);
    border-color: rgba(var(--primary-rgb), 0.25);
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.skill-name {
    font-size: 16px;
    color: var(--text-white);
    font-weight: 500;
}

.skill-percent {
    font-size: 15px;
    color: var(--light);
    font-weight: 600;
}

.skill-bar {
    height: 10px;
    background: rgba(var(--primary-rgb), 0.15);
    border-radius: 5px;
    overflow: hidden;
    position: relative;
}

body.light-mode .skill-bar {
    background: rgba(var(--primary-rgb), 0.1);
}

.skill-bar::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, rgba(var(--primary-rgb), 0.3), transparent);
}

.skill-progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--light));
    border-radius: 5px;
    transition: width 1.5s ease;
    position: relative;
    overflow: hidden;
}

.skill-progress::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2));
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.project-card {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.08), rgba(var(--light-rgb), 0.04));
    border-radius: 18px;
    padding: 30px;
    border: 1px solid var(--border-color);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
}

.project-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.project-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--light));
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.project-card:hover {
    transform: translateY(-8px);
    border-color: rgba(var(--primary-rgb), 0.3);
    box-shadow: 0 15px 40px rgba(var(--primary-rgb), 0.15);
}

.project-card:hover::before {
    transform: scaleX(1);
}

.project-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-white);
}

.project-desc {
    font-size: 15px;
    color: var(--text-gray);
    margin-bottom: 20px;
    line-height: 1.7;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.project-tag {
    padding: 6px 14px;
    background: rgba(var(--primary-rgb), 0.15);
    border-radius: 20px;
    font-size: 13px;
    color: var(--light);
    font-weight: 500;
    border: 1px solid rgba(var(--primary-rgb), 0.2);
    transition: all 0.3s ease;
}

.project-tag:hover {
    background: rgba(var(--primary-rgb), 0.25);
    border-color: rgba(var(--primary-rgb), 0.4);
}

.contact-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.contact-card {
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.1), rgba(var(--light-rgb), 0.05));
    border-radius: 16px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s ease;
    border: 1px solid rgba(var(--primary-rgb), 0.15);
    opacity: 0;
    transform: translateY(20px);
}

.contact-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.contact-card:hover {
    transform: translateY(-5px);
    background: linear-gradient(135deg, rgba(var(--primary-rgb), 0.15), rgba(var(--light-rgb), 0.1));
    border-color: rgba(var(--primary-rgb), 0.3);
    box-shadow: 0 10px 30px rgba(var(--primary-rgb), 0.15);
}

.contact-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary), var(--light));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    box-shadow: 0 4px 15px rgba(var(--primary-rgb), 0.4);
}

.contact-info h4 {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 6px;
    font-weight: 500;
}

.contact-info p {
    font-size: 16px;
    color: var(--text-white);
}

.contact-info a {
    color: var(--text-white);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-info a:hover {
    color: var(--lightest);
}

.back-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 55px;
    height: 55px;
    background: linear-gradient(135deg, var(--primary), var(--light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s ease;
    box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.5);
    font-size: 22px;
    color: white;
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(var(--primary-rgb), 0.6);
}

footer {
    text-align: center;
    padding: 40px 30px;
    border-top: 1px solid var(--border-color);
    margin-top: 40px;
    background: rgba(26, 26, 46, 0.5);
}

body.light-mode footer {
    background: rgba(var(--primary-rgb), 0.03);
}

.copyright {
    color: var(--text-gray);
    font-size: 15px;
    margin-bottom: 18px;
}

.links-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.links-footer a {
    color: var(--text-gray);
    text-decoration: none;
    font-size: 13px;
    transition: all 0.3s ease;
    position: relative;
}

.links-footer a:hover {
    color: var(--light);
    transform: translateY(-2px);
}

.links-footer a::after {
    content: '|';
    margin-left: 15px;
    color: var(--text-gray);
    opacity: 0.4;
}

.links-footer a:last-child::after {
    content: '';
}

.ip-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: var(--text-gray);
    font-size: 13px;
    margin: 8px 0;
}

.ip-display span:first-child {
    color: var(--light);
}

.beian {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: var(--text-gray);
    font-size: 12px;
}

.beian a {
    color: var(--text-gray);
    text-decoration: none;
    transition: all 0.3s ease;
}

.beian a:hover {
    color: var(--light);
}

.style-switcher {
    position: relative;
    display: flex;
    align-items: center;
}

.current-style-btn {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(var(--primary-rgb), 0.1);
    border: 2px solid rgba(var(--primary-rgb), 0.3);
}

.current-style-btn:hover {
    background: rgba(var(--primary-rgb), 0.2);
    border-color: rgba(var(--primary-rgb), 0.5);
    transform: scale(1.05);
}

.style-dot {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, #8B5CF6, #A78BFA);
    transition: all 0.3s ease;
}

.style-menu {
    position: absolute;
    top: 45px;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    z-index: 1000;
}

.style-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.style-option {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.style-option[data-style="purple"] {
    background: linear-gradient(135deg, #8B5CF6, #A78BFA);
}

.style-option[data-style="blue"] {
    background: linear-gradient(135deg, #3B82F6, #60A5FA);
}

.style-option[data-style="yellow"] {
    background: linear-gradient(135deg, #F59E0B, #FBBF24);
}

.style-option:hover {
    transform: scale(1.15);
    border-color: rgba(255, 255, 255, 0.6);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.lang-switcher {
    position: relative;
    display: flex;
    align-items: center;
}

.current-lang-btn {
    padding: 8px 14px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(var(--primary-rgb), 0.1);
    border: 1px solid rgba(var(--primary-rgb), 0.3);
    color: var(--text-gray);
    font-size: 13px;
}

.current-lang-btn:hover {
    background: rgba(var(--primary-rgb), 0.2);
    border-color: rgba(var(--primary-rgb), 0.5);
}

.lang-menu {
    position: absolute;
    top: 45px;
    right: 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    min-width: 100px;
}

.lang-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
    font-size: 13px;
    color: var(--text-gray);
}

.lang-option:hover {
    background: rgba(var(--primary-rgb), 0.2);
    color: var(--light);
}

@media (max-width: 768px) {
    .nav-container {
        padding: 0 20px;
    }

    .nav-links {
        gap: 12px;
    }

    .nav-links a {
        font-size: 13px;
    }

    .nav-btn {
        padding: 8px 12px;
        font-size: 12px;
    }

    .container {
        padding: 100px 20px 40px;
    }

    .section {
        padding: 30px 25px;
    }

    .profile-header {
        flex-direction: column;
        text-align: center;
        gap: 30px;
    }

    .avatar {
        width: 180px;
        height: 180px;
    }

    .profile-info h1 {
        font-size: 36px;
    }

    .profile-desc {
        text-align: left;
    }

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

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

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

    .links-footer a {
        margin: 0 10px;
        font-size: 13px;
    }

    .back-to-top {
        right: 20px;
        bottom: 30px;
    }
}