/* ============================================
   设计师作品集 - 主样式表
   极简风格 · 黑白灰配色 · 响应式布局
   ============================================ */

/* CSS 变量 - 主题色与排版 */
:root {
    --color-bg: #fafafa;
    --color-bg-alt: #f5f5f5;
    --color-text: #1a1a1a;
    --color-text-muted: #666;
    --color-text-light: #999;
    --color-accent: #2c2c2c;
    --color-border: #e5e5e5;
    --color-white: #ffffff;
    
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2rem;
    --space-xl: 3rem;
    --space-2xl: 5rem;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.35s ease;
    --transition-slow: 0.5s ease;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    
    --header-height: 72px;
}

/* 基础重置 */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

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

ul {
    list-style: none;
}

/* ============================================
   固定导航栏
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--header-height);
    background: rgba(250, 250, 250, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-normal), background var(--transition-normal);
}

.header.scrolled {
    border-bottom-color: var(--color-border);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
    height: 100%;
}

.nav__logo {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.nav__menu {
    display: flex;
    gap: var(--space-xl);
}

.nav__link {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link.active {
    color: var(--color-text);
}

/* 移动端汉堡菜单按钮 - 默认隐藏 */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    padding: var(--space-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.nav__toggle-bar {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: var(--transition-fast);
}

/* ============================================
   Hero 区
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--header-height) var(--space-lg) var(--space-2xl);
    text-align: center;
}

.hero__content {
    max-width: 640px;
}

.hero__title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 300;
    letter-spacing: 0.08em;
    margin-bottom: var(--space-md);
    line-height: 1.2;
}

.hero__subtitle {
    font-size: 1rem;
    color: var(--color-text-muted);
    letter-spacing: 0.04em;
    margin-bottom: var(--space-xl);
}

.hero__cta {
    display: inline-block;
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
    color: var(--color-white);
    background: var(--color-accent);
    border-radius: var(--radius-sm);
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.hero__cta:hover {
    background: var(--color-text);
    transform: translateY(-2px);
}

.hero__scroll {
    position: absolute;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.hero__scroll-text {
    font-size: 0.75rem;
    color: var(--color-text-light);
    letter-spacing: 0.1em;
}

.hero__scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-text-light), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* ============================================
   通用区块标题
   ============================================ */
.section__header {
    text-align: center;
    max-width: 560px;
    margin: 0 auto var(--space-2xl);
}

.section__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 300;
    letter-spacing: 0.06em;
    margin-bottom: var(--space-sm);
}

.section__desc {
    font-size: 1rem;
    color: var(--color-text-muted);
}

/* ============================================
   作品展示区 - 网格布局
   ============================================ */
.works {
    padding: var(--space-2xl) var(--space-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.works__filter {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    flex-wrap: wrap;
}

.works__filter-btn {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.works__filter-btn:hover,
.works__filter-btn.active {
    color: var(--color-text);
    border-color: var(--color-accent);
    background: var(--color-bg-alt);
}

.works__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
}

.work-card {
    opacity: 1;
}

.work-card__link {
    display: block;
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-bg-alt);
}

.work-card__image-wrap {
    position: relative;
    padding-bottom: 56.25%;
    overflow: hidden;
}

.work-card__image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    transition: transform var(--transition-slow);
}

.work-card__link:hover .work-card__image {
    transform: scale(1.05);
}

.work-card__info {
    padding: var(--space-md);
}

.work-card__category {
    display: inline-block;
    font-size: 0.75rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-xs);
}

.work-card__title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

.work-card__desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ============================================
   关于我
   ============================================ */
.about {
    padding: var(--space-2xl) var(--space-lg);
    background: var(--color-bg-alt);
}

.about__content {
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: var(--space-2xl);
    align-items: center;
    max-width: 1000px;
    margin: 0 auto;
}

.about__image-wrap {
    border-radius: var(--radius-md);
    overflow: hidden;
}

.about__image {
    width: 100%;
}

.about__text p {
    margin-bottom: var(--space-md);
    color: var(--color-text-muted);
    font-size: 1rem;
}

.about__text p:last-child {
    margin-bottom: 0;
}

/* ============================================
   经验背景 - 时间线
   ============================================ */
.experience {
    padding: var(--space-2xl) var(--space-lg);
    max-width: 800px;
    margin: 0 auto;
}

.timeline {
    position: relative;
}

.timeline__group {
    margin-bottom: var(--space-2xl);
}

.timeline__group:last-child {
    margin-bottom: 0;
}

.timeline__group-title {
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.timeline__item {
    display: flex;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

.timeline__item:last-child {
    margin-bottom: 0;
}

.timeline__marker {
    flex-shrink: 0;
    width: 12px;
    height: 12px;
    margin-top: 6px;
    border-radius: 50%;
    background: var(--color-accent);
}

.timeline__content {
    flex: 1;
}

.timeline__time {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-bottom: var(--space-xs);
}

.timeline__title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

.timeline__subtitle {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.timeline__desc {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

/* ============================================
   联系方式
   ============================================ */
.contact {
    padding: var(--space-2xl) var(--space-lg);
    background: var(--color-bg-alt);
}

.contact__content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    max-width: 600px;
    margin: 0 auto;
}

.contact__item {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--color-white);
    border-radius: var(--radius-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.contact__item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.contact__label {
    font-size: 0.8rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.contact__value {
    font-size: 1rem;
    color: var(--color-text);
}

/* ============================================
   页脚
   ============================================ */
.footer {
    padding: var(--space-lg);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.footer__copyright {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* ============================================
   响应式 - 平板
   ============================================ */
@media (max-width: 1024px) {
    .about__content {
        grid-template-columns: 1fr;
    }
    
    .about__image-wrap {
        max-width: 360px;
        margin: 0 auto;
    }
}

/* ============================================
   响应式 - 移动端
   ============================================ */
@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }
    
    .nav__menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-lg);
        background: var(--color-bg);
        opacity: 0;
        visibility: hidden;
        transition: opacity var(--transition-normal), visibility var(--transition-normal);
    }
    
    .nav__menu.active {
        opacity: 1;
        visibility: visible;
    }
    
    .nav__toggle {
        display: flex;
        z-index: 101;
    }
    
    .nav__toggle.active .nav__toggle-bar:nth-child(1) {
        transform: rotate(45deg) translate(6px, 6px);
    }
    
    .nav__toggle.active .nav__toggle-bar:nth-child(2) {
        opacity: 0;
    }
    
    .nav__toggle.active .nav__toggle-bar:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }
    
    .works__grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }
    
    .contact__content {
        grid-template-columns: 1fr;
    }
    
    .timeline__item {
        flex-direction: column;
        gap: var(--space-sm);
    }
    
    .timeline__marker {
        margin-top: 0;
    }
}

@media (max-width: 480px) {
    .nav {
        padding: 0 var(--space-md);
    }
    
    .works,
    .about,
    .experience,
    .contact {
        padding: var(--space-xl) var(--space-md);
    }
}

/* ============================================
   作品详情页
   ============================================ */
.work-detail {
    padding: calc(var(--header-height) + var(--space-2xl)) var(--space-lg) var(--space-2xl);
    max-width: 800px;
    margin: 0 auto;
}

.header--detail .nav__logo:hover {
    color: var(--color-text);
}

.work-detail__loading {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-muted);
}

.work-detail__meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}

.work-detail__category,
.work-detail__year,
.work-detail__client {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

.work-detail__title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 300;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-sm);
}

.work-detail__subtitle {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xl);
}

.work-detail__image-wrap,
.work-detail__gallery {
    margin-bottom: var(--space-2xl);
}

.work-detail__gallery {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.work-detail__gallery-item {
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-bg-alt);
}

.work-detail__image-wrap {
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--color-bg-alt);
}

.work-detail__image {
    width: 100%;
    height: auto;
    display: block;
}

.work-detail__body {
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-xl);
}

.work-detail__section {
    margin-bottom: var(--space-xl);
}

.work-detail__section:last-of-type {
    margin-bottom: var(--space-lg);
}

.work-detail__section-title {
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.work-detail__text {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-muted);
}

.work-detail__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.work-detail__tag {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    background: var(--color-bg-alt);
    border-radius: var(--radius-sm);
}