:root {
    --color-primary: #002FA7;
    --color-black: #0a0a0a;
    --color-dark: #1a1a1a;
    --color-gray-900: #222222;
    --color-gray-800: #333333;
    --color-gray-600: #666666;
    --color-gray-400: #999999;
    --color-gray-200: #e5e5e5;
    --color-gray-100: #f5f5f5;
    --color-white: #ffffff;
    --font-primary: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
    --header-height: 80px;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul {
    list-style: none;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.nav-logo-img {
    height: 36px;
    width: auto;
    display: block;
}

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-600);
    position: relative;
    padding: 8px 0;
    transition: color var(--transition-normal);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

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

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-black);
    transition: all var(--transition-normal);
}

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--header-height) 24px 60px;
    position: relative;
    overflow: hidden;
    background: var(--color-gray-100);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url(images/hero-banner.png) center / cover no-repeat;
    transform: scaleX(1) scaleY(1.02);
    transform-origin: center;
    will-change: transform;
    pointer-events: none;
    z-index: 0;
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    margin-bottom: 16px;
    letter-spacing: -0.03em;
    line-height: 1.1;
    white-space: nowrap;
}

.hero-name {
    display: inline;
}

.hero-divider {
    display: inline;
    margin: 0 16px;
    color: var(--color-gray-400);
    font-weight: var(--font-weight-light);
}

.hero-role {
    display: inline;
    color: var(--color-primary);
}

.hero-slogan {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-800);
    margin-bottom: 24px;
    letter-spacing: -0.01em;
}

.hero-desc {
    font-size: 1rem;
    color: var(--color-gray-600);
    margin-bottom: 40px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--color-gray-400);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-gray-400);
    border-radius: 12px;
    position: relative;
}

.scroll-dot {
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-gray-400);
    border-radius: 2px;
    animation: scrollBounce 2s infinite;
}

@keyframes scrollBounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
        opacity: 1;
    }
    50% {
        transform: translateX(-50%) translateY(12px);
        opacity: 0.3;
    }
}

.section {
    padding: 120px 0;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    text-align: center;
    margin-bottom: 60px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    display: block;
    font-size: 0.9rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    margin-top: 12px;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
    align-items: start;
    margin-bottom: 80px;
}

.about-image-wrapper {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
}

.about-image-wrapper::before {
    content: '';
    position: absolute;
    top: 16px;
    left: 16px;
    right: -16px;
    bottom: -16px;
    border: 2px solid var(--color-primary);
    border-radius: 8px;
    z-index: -1;
}

.about-image-wrapper img {
    width: 100%;
    height: auto;
    transition: transform var(--transition-slow);
}

.about-image-wrapper:hover img {
    transform: scale(1.03);
}

.about-name {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    margin-bottom: 8px;
}

.about-title-text {
    font-size: 1rem;
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: 24px;
}

.about-desc {
    font-size: 0.9375rem;
    color: var(--color-gray-600);
    margin-bottom: 24px;
    line-height: 1.8;
}

.about-stats {
    display: flex;
    gap: 40px;
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid var(--color-gray-200);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-black);
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-gray-600);
}

.about-cta {
    display: inline-block;
    margin-top: 32px;
    padding: 14px 32px;
    background: transparent;
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: var(--font-weight-medium);
    border: 2px solid var(--color-primary);
    border-radius: 4px;
    transition: all var(--transition-normal);
}

.about-cta:hover {
    background: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.clients {
    text-align: center;
}

.clients-title {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-black);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 32px;
    text-align: center;
}

.clients-grid {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 40px;
}

.client-item {
    filter: grayscale(100%);
    opacity: 0.5;
    transition: all var(--transition-normal);
}

.client-item:hover {
    filter: grayscale(0%);
    opacity: 1;
}

.client-item img {
    width: 140px;
    height: auto;
}

.portfolio {
    background: var(--color-gray-100);
}

.portfolio-grid {
    column-count: 4;
    column-gap: 24px;
}

.portfolio-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    cursor: pointer;
    break-inside: avoid;          /* 多列瀑布流：阻止单张作品被分栏切断 */
    -webkit-column-break-inside: avoid;
    page-break-inside: avoid;
    display: inline-block;
    vertical-align: top;          /* 强制每张图顶对齐，消除 baseline 导致的微小下坠 */
    width: 100%;
    margin-bottom: 24px;
}

.portfolio-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--transition-slow);
}

.portfolio-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.portfolio-item:hover img {
    transform: scale(1.1);
}

.portfolio-item:hover .portfolio-overlay {
    opacity: 1;
}

.portfolio-title {
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    margin-bottom: 8px;
    transform: translateY(20px);
    transition: transform var(--transition-normal);
}

.portfolio-category {
    font-size: 0.85rem;
    color: var(--color-gray-400);
    transform: translateY(20px);
    transition: transform var(--transition-normal) 0.1s;
}

.portfolio-item:hover .portfolio-title,
.portfolio-item:hover .portfolio-category {
    transform: translateY(0);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.expertise-card {
    text-align: center;
    padding: 40px 24px;
    background: var(--color-white);
    border-radius: 8px;
    transition: all var(--transition-normal);
    border: 1px solid transparent;
}

.expertise-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.expertise-icon {
    color: var(--color-primary);
    margin-bottom: 24px;
}

.expertise-title {
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-black);
    margin-bottom: 16px;
}

.expertise-desc {
    font-size: 0.9rem;
    color: var(--color-gray-600);
    line-height: 1.7;
}

.experience {
    background: var(--color-gray-100);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-gray-200);
}

.timeline-item {
    position: relative;
    padding-left: 40px;
    padding-bottom: 48px;
}

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

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 8px;
    width: 14px;
    height: 14px;
    background: var(--color-white);
    border: 3px solid var(--color-primary);
    border-radius: 50%;
}

.timeline-content {
    background: var(--color-white);
    padding: 32px;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
}

.timeline-content:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(8px);
}

.timeline-item:hover .timeline-marker {
    transform: scale(1.3);
    background: var(--color-primary);
}

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 8px;
    width: 14px;
    height: 14px;
    background: var(--color-white);
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    transition: all var(--transition-normal);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 8px;
}

.timeline-company {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-black);
}

.timeline-date {
    font-size: 0.85rem;
    color: var(--color-gray-400);
    font-weight: var(--font-weight-medium);
}

.timeline-position {
    font-size: 1rem;
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: 16px;
}

.timeline-achievements {
    font-size: 0.9rem;
    color: var(--color-gray-600);
    line-height: 1.8;
}

.timeline-achievements li {
    position: relative;
    padding-left: 16px;
    margin-bottom: 8px;
    transition: all var(--transition-fast);
}

.timeline-achievements li:hover {
    color: var(--color-black);
    padding-left: 20px;
}

.timeline-achievements li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--color-gray-400);
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.timeline-achievements li:hover::before {
    background: var(--color-primary);
    transform: scale(1.2);
}

.contact-subtitle {
    text-align: center;
    font-size: 1rem;
    color: var(--color-gray-600);
    margin-top: -40px;
    margin-bottom: 60px;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-item {
    text-align: center;
    padding: 40px 24px;
    background: var(--color-gray-100);
    border-radius: 8px;
    transition: all var(--transition-normal);
}

.contact-item:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.contact-icon {
    color: var(--color-primary);
    margin-bottom: 20px;
}

.contact-label {
    font-size: 0.85rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-gray-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 12px;
}

.contact-value {
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    color: var(--color-black);
}

.contact-value:hover {
    color: var(--color-primary);
}

.wechat-wrapper {
    position: relative;
    display: inline-block;
    cursor: pointer;
}

/* 整张微信卡片（白色圆角矩形）都可触发二维码气泡 */
.contact-item:has(.wechat-qrcode) {
    cursor: pointer;
}

.wechat-qrcode {
    position: absolute;
    bottom: calc(100% + 16px);
    left: 50%;
    transform: translateX(-50%) scale(0.8);
    opacity: 0;
    visibility: hidden;
    background: var(--color-white);
    padding: 8px;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.wechat-qrcode::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 8px solid var(--color-white);
}

.contact-item:hover .wechat-qrcode {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) scale(1);
}

.wechat-qrcode img {
    display: block;
    width: 173px;
    height: auto;
    max-width: 90vw;
    border-radius: 8px;
}

.footer {
    background: var(--color-black);
    padding: 40px 0;
}

.footer-text {
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-gray-400);
}

.footer-beian {
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-gray-400);
    margin-top: 8px;
}

.footer-beian a {
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

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

.lightbox {
    position: fixed;
    inset: 0;
    background: #000;
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 48px;
    height: 48px;
    background: transparent;
    border: none;
    color: var(--color-white);
    font-size: 2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-close:hover {
    color: var(--color-primary);
    transform: rotate(90deg);
}

.lightbox-image {
    max-width: 90%;
    max-height: 85vh;
    object-fit: contain;
    border-radius: 4px;
}

.lightbox-info {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--color-white);
}

.lightbox-title {
    display: none; /* 灯箱预览隐藏白色作品名称 */
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: 8px;
}

.lightbox-category {
    display: none; /* 灯箱预览同时隐藏灰字分类，点开后仅显示纯图片 */
    font-size: 0.9rem;
    color: var(--color-gray-400);
}

.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: var(--color-white);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-prev {
    left: 24px;
}

.lightbox-next {
    right: 24px;
}

.lightbox-prev:hover,
.lightbox-next:hover {
    background: var(--color-primary);
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 1024px) {
    .expertise-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    
    .portfolio-grid {
        column-count: 3;
        column-gap: 20px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 70px;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        align-items: center;
        padding: 32px 0;
        gap: 24px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .about-image {
        max-width: 300px;
        margin: 0 auto;
    }
    
    .about-stats {
        justify-content: center;
    }

    .about-cta {
        display: block;
        text-align: center;
        margin-left: auto;
        margin-right: auto;
        max-width: 240px;
    }

    .expertise-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .timeline::before {
        left: 6px;
    }
    
    .timeline-item {
        padding-left: 32px;
    }
    
    .timeline-marker {
        left: 0;
    }
    
    .timeline-header {
        flex-direction: column;
    }
    
    .section {
        padding: 80px 0;
    }
    
    .hero-scroll {
        display: none;
    }

    .hero-bg {
        background-image: url(images/hero-banner-mobile.png);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 24px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-divider {
        display: none;
    }
    
    .hero-role {
        display: block;
        margin-top: 8px;
    }
    
    .about-stats {
        flex-direction: column;
        gap: 24px;
    }
    
    .about-cta {
        display: block;
        text-align: center;
        margin-left: auto;
        margin-right: auto;
    }
    
    .clients-grid {
        gap: 24px;
    }
    
    .portfolio-grid {
        column-count: 2;
        column-gap: 16px;
    }

    .portfolio-item {
        margin-bottom: 16px;
    }
    
    .timeline-content {
        padding: 24px;
    }
    
    .lightbox-prev,
    .lightbox-next {
        width: 40px;
        height: 40px;
    }
    
    .lightbox-prev {
        left: 12px;
    }
    
    .lightbox-next {
        right: 12px;
    }
}

@media (max-width: 768px) {
    .clients-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
}

@media (max-width: 480px) {
    .clients-grid {
        display: grid;
        grid-template-columns: repeat(2, 140px);
        justify-content: center;
        gap: 20px;
    }
}