:root {
    /* 色彩规范 */
    --color-bg: #FAF9F6;          /* 柔和纸白色 */
    --color-text: #1A1A1A;        /* 深炭灰 */
    --color-text-light: #555555;
    --color-border: #E5E5E5;      /* 浅灰 */
    --color-accent: #1b2399;      /* 复古朱红 */

    /* 字体规范 */
    --font-serif: 'Cormorant Garamond', 'Playfair Display', serif;
    --font-sans: 'Inter', -apple-system, 'PingFang SC', 'Hiragino Sans GB', 'Songti SC', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* 布局尺寸 */
    --nav-width: 250px;
    --spacing-lg: 4rem;
    --spacing-md: 2rem;
    --spacing-sm: 1rem;
}

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

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

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, .nav-brand {
    font-family: var(--font-serif);
    font-weight: 400;
}

/* 导航栏 (Sticky Nav) */
.sidebar-wrapper {
    width: 100%;
    position: sticky;
    top: var(--spacing-lg);
    align-self: start;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding-bottom: var(--spacing-md);
    padding-right: var(--spacing-md);
    border-right: 1px solid var(--color-border);
}

.sticky-nav {
    display: flex;
    flex-direction: column;
    background-color: transparent;
}

.nav-brand {
    font-size: 1.5rem;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-lg);
}

.nav-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.nav-links a {
    text-decoration: none;
    color: var(--color-text-light);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.05em;
    transition: color 0.3s ease;
    display: inline-block;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text);
}

.nav-links a.active::before {
    content: '';
    position: absolute;
    left: -15px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--color-accent);
}

/* 主内容区 */
.main-content {
    min-height: 100vh;
    padding: var(--spacing-lg) var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.layout-container {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

@media (min-width: 768px) {
    .layout-container {
        grid-template-columns: 3fr 9fr;
    }
}

.projects-container {
    display: flex;
    flex-direction: column;
    gap: 8rem;
}

/* 封面区 */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border-bottom: 1px solid var(--color-border);
}

.hero-content {
    text-align: center;
}

.hero h1 {
    font-size: 4rem;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}

.hero p {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    color: var(--color-text-light);
    font-style: italic;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.scroll-indicator .line {
    width: 1px;
    height: 40px;
    background-color: var(--color-text-light);
}

/* 项目布局 */
.project-item {
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 6rem;
    display: flex;
    flex-direction: column;
    gap: 4rem;
}
.project-item:last-child {
    border-bottom: none;
}

.project-info {
    max-width: 42rem;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.project-info h2 {
    font-size: 1.5rem;
    margin-bottom: 0;
    line-height: 1.2;
}

.project-desc {
    color: var(--color-text-light);
    font-size: 0.85rem;
    font-weight: 300;
}

.project-desc p {
    margin-bottom: 1rem;
}

.project-meta {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--color-text-light);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.project-meta span:first-child {
    margin-bottom: 0.5rem;
}

/* 项目 & 画廊防止图片撑开 Grid 列 */
.projects-container,
.project-item,
.project-gallery {
    min-width: 0;
}

/* 画廊横向滚动 (Gallery Slider) */
.project-gallery {
    width: 100%;
    position: relative;
    background-color: var(--color-bg);
    border-top: 1px solid rgba(0, 0, 0, 0.02);
    padding-top: var(--spacing-lg);
    overflow: visible;
}

.slider-container {
    display: flex;
    gap: 1.25rem;
    padding-bottom: var(--spacing-md);
    padding-left: 0.25rem;
    padding-right: 0.25rem;
    overflow-x: auto;
    overflow-y: visible;
    scroll-snap-type: x proximity;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; 
    align-items: center;
    min-width: 0;
    max-width: 100%;
    width: 100%;
}

.slider-container::-webkit-scrollbar {
    display: none;
}

.slider-container img {
    height: 58vh;
    width: auto;
    max-width: 75%;
    object-fit: contain;
    scroll-snap-align: start;
    scroll-snap-stop: normal;
    flex-shrink: 0;
    cursor: zoom-in;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    transition: transform 0.3s ease;
}

.slider-container img:hover {
    transform: scale(1.01);
}

.slider-controls {
    position: static;
    pointer-events: none;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: auto;
    background: rgba(250, 249, 246, 0.92);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    border: 1px solid var(--color-border);
    color: var(--color-text);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    font-size: 1.6rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.35s ease;
    opacity: 0.35;
    z-index: 10;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
}

.slider-btn.prev {
    left: 1rem;
}

.slider-btn.next {
    right: 1rem;
}

.project-gallery:hover .slider-btn {
    opacity: 1;
}

.project-gallery:hover .slider-btn.prev {
    left: 1.25rem;
}

.project-gallery:hover .slider-btn.next {
    right: 1.25rem;
}

.slider-btn:hover {
    background: var(--color-text);
    color: var(--color-bg);
}

/* 页脚 */
footer {
    border-top: 1px solid rgba(0, 0, 0, 0.03);
    padding: var(--spacing-lg) 0;
    max-width: 1440px;
    margin: 0 auto;
    width: 100%;
    padding-left: var(--spacing-md);
    padding-right: var(--spacing-md);
}

.footer-layout {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(0, 0, 0, 0.03);
}

@media (min-width: 768px) {
    .footer-layout {
        grid-template-columns: repeat(3, 1fr);
    }
}

.footer-col h3 {
    font-family: var(--font-serif);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--color-text);
    letter-spacing: 0.05em;
}

.footer-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-list li,
.footer-list a {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    color: var(--color-text-light);
    text-decoration: none;
    font-weight: 300;
    transition: color 0.3s;
}

.footer-list a:hover {
    color: var(--color-text);
}

.footer-list strong {
    font-weight: 600;
    color: var(--color-text);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.copyright {
    font-family: var(--font-serif);
    font-size: 0.8rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.back-to-top {
    font-family: var(--font-serif);
    font-size: 0.8rem;
    color: var(--color-text-light);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color 0.3s;
}

.back-to-top:hover {
    color: var(--color-text);
}

/* Lightbox 模态框 */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(26, 26, 26, 0.98);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.lightbox.active {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

.lightbox-close {
    position: absolute;
    top: 2rem;
    right: 2rem;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    font-family: var(--font-sans);
    transition: color 0.3s;
}

.lightbox-close:hover {
    color: var(--color-accent);
}

.lightbox-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    color: #fff;
    font-size: 4rem;
    cursor: pointer;
    padding: 1rem;
    transition: color 0.3s;
}

.lightbox-btn:hover {
    color: var(--color-accent);
}

.lightbox-btn.prev { left: 2rem; }
.lightbox-btn.next { right: 2rem; }

.lightbox-meta {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: #aaa;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    letter-spacing: 0.05em;
}

/* 响应式设计 (Mobile) */
@media (max-width: 767px) {
    .sidebar-wrapper {
        position: relative;
        top: 0;
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        padding-right: 0;
    }

    .sticky-nav {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        width: 100%;
    }

    .nav-brand {
        margin-bottom: 0;
        font-size: 1.2rem;
    }

    .nav-links {
        flex-direction: row;
        overflow-x: auto;
        white-space: nowrap;
        scrollbar-width: none;
    }
    
    .nav-links a.active::before {
        display: none;
    }
    
    .nav-links a.active {
        color: var(--color-accent);
    }

    .layout-container {
        gap: var(--spacing-md);
    }
    
    .project-item {
        padding-bottom: 4rem;
        gap: 2rem;
    }
    
    .slider-container img {
        height: 50vh;
    }
    
    .footer-content {
        flex-direction: column;
        align-items: flex-start;
    }
}