/* ========== 设计令牌 ========== */
:root {
  /* 调色板 — 暗色系，低饱和，高级感 */
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: #1a1a1a;
  --bg-overlay: rgba(0, 0, 0, 0.7);

  --text-primary: #f5f5f5;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --text-accent: #c8a97e; /* 暖金色点缀 */

  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-active: rgba(200, 169, 126, 0.4);

  /* 排版 */
  --font-serif: "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;

  --text-xs: clamp(0.7rem, 0.65rem + 0.25vw, 0.8rem);
  --text-sm: clamp(0.8rem, 0.75rem + 0.25vw, 0.9rem);
  --text-base: clamp(0.95rem, 0.9rem + 0.25vw, 1.05rem);
  --text-lg: clamp(1.1rem, 1rem + 0.5vw, 1.4rem);
  --text-xl: clamp(1.4rem, 1.2rem + 1vw, 2rem);
  --text-2xl: clamp(1.8rem, 1.4rem + 2vw, 3rem);
  --text-hero: clamp(3rem, 1.5rem + 6vw, 7rem);

  /* 间距 */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1.25rem;
  --space-lg: 2rem;
  --space-xl: 3.5rem;
  --space-2xl: 6rem;
  --space-section: clamp(5rem, 3rem + 8vw, 10rem);

  /* 动画 */
  --duration-fast: 200ms;
  --duration-normal: 400ms;
  --duration-slow: 700ms;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);

  /* 布局 */
  --max-width: 1400px;
  --nav-height: 60px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

/* ========== 导航 ========== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-lg);
  background: linear-gradient(to bottom, var(--bg-primary), transparent);
  transition: background var(--duration-normal) var(--ease-out-expo);
}

.site-nav.scrolled {
  background: rgba(10, 10, 10, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-logo {
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: lowercase;
}

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

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  transition: color var(--duration-fast) var(--ease-out-expo);
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--text-accent);
  transition: width var(--duration-normal) var(--ease-out-expo);
}

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

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

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--text-primary);
  transition: transform var(--duration-fast) var(--ease-out-expo),
              opacity var(--duration-fast);
}

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

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(200, 169, 126, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 30%, rgba(100, 100, 120, 0.06) 0%, transparent 50%),
    var(--bg-primary);
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero-tagline {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--text-accent);
  letter-spacing: 0.2em;
  margin-bottom: var(--space-md);
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp var(--duration-slow) var(--ease-out-expo) 0.3s forwards;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: var(--text-hero);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.05em;
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp var(--duration-slow) var(--ease-out-expo) 0.5s forwards;
}

.hero-subtitle {
  font-size: var(--text-lg);
  font-weight: 300;
  color: var(--text-secondary);
  letter-spacing: 0.5em;
  display: block;
  margin-top: var(--space-md);
}

/* 向下滚动指示 */
.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);
  z-index: 1;
  opacity: 0;
  animation: fadeIn var(--duration-normal) var(--ease-out-expo) 1.2s forwards;
}

.hero-scroll span {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--text-muted);
  text-transform: uppercase;
}

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

/* ========== 通用区块头部 ========== */
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-header h2 {
  font-family: var(--font-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-sm);
}

.section-desc {
  font-size: var(--text-base);
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.15em;
}

/* ========== 作品集 ========== */
.gallery {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-section) var(--space-lg);
}

/* 筛选按钮 */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.filter-btn {
  padding: var(--space-xs) var(--space-md);
  font-size: var(--text-base);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  transition: all var(--duration-fast) var(--ease-out-expo);
}

.filter-btn:hover {
  color: var(--text-secondary);
  border-color: var(--border-active);
}

.filter-btn.active {
  color: var(--text-accent);
  border-color: var(--text-accent);
  background: rgba(200, 169, 126, 0.08);
}

/* 作品网格 — 瀑布风格 */
.gallery-grid {
  columns: 3;
  column-gap: var(--space-md);
}

.gallery-item {
  break-inside: avoid;
  margin-bottom: var(--space-md);
  position: relative;
  overflow: hidden;
  cursor: pointer;
  opacity: 1;
  transition: opacity var(--duration-normal) var(--ease-out-expo),
              transform var(--duration-normal) var(--ease-out-expo);
}

.gallery-item.hidden {
  display: none;
}

.gallery-item-image {
  position: relative;
  overflow: hidden;
}

.gallery-item-image::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.6) 0%, transparent 40%);
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out-expo);
}

.gallery-item:hover .gallery-item-image::after {
  opacity: 1;
}

.gallery-item-image img {
  width: 100%;
  display: block;
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.gallery-item:hover .gallery-item-image img {
  transform: scale(1.03);
}

.gallery-item-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-lg) var(--space-md) var(--space-sm);
  z-index: 1;
  transform: translateY(8px);
  opacity: 0;
  transition: all var(--duration-normal) var(--ease-out-expo);
}

.gallery-item:hover .gallery-item-info {
  transform: translateY(0);
  opacity: 1;
}

.gallery-item-info p {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  letter-spacing: 0.2em;
}

/* ========== 关于 ========== */
.about {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.about-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-section) var(--space-lg);
}

.about-body {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: var(--space-2xl);
  align-items: center;
}

.about-image {
  position: relative;
}

.about-image::before {
  content: "";
  position: absolute;
  top: -12px;
  left: -12px;
  right: 12px;
  bottom: 12px;
  border: 1px solid var(--text-accent);
  opacity: 0.3;
  border-radius: 2px;
}

.about-image img {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border-radius: 2px;
  filter: grayscale(20%);
  transition: filter var(--duration-normal) var(--ease-out-expo);
}

.about-image:hover img {
  filter: grayscale(0%);
}

.about-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.about-intro {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--text-accent);
  line-height: 1.9;
}

.about-text p {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 2;
}

.about-stats {
  display: flex;
  gap: var(--space-xl);
  margin-top: var(--space-md);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-subtle);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-number {
  font-family: var(--font-serif);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text-accent);
}

.stat-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

/* ========== 联系 ========== */
.contact {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-section) var(--space-lg);
  text-align: center;
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--border-subtle);
  border-radius: 2px;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out-expo);
}

.contact-link:hover {
  color: var(--text-accent);
  border-color: var(--border-active);
  background: rgba(200, 169, 126, 0.05);
}

.contact-link svg {
  flex-shrink: 0;
  opacity: 0.6;
}

/* ========== 页脚 ========== */
.site-footer {
  text-align: center;
  padding: var(--space-lg);
  font-size: var(--text-xs);
  color: var(--text-muted);
  letter-spacing: 0.1em;
  border-top: 1px solid var(--border-subtle);
}

/* ========== 灯箱 ========== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.95);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out-expo);
}

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

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  z-index: 201;
  font-size: var(--text-xl);
  color: var(--text-secondary);
  padding: var(--space-sm);
  transition: color var(--duration-fast);
}

.lightbox-close {
  top: var(--space-md);
  right: var(--space-lg);
  font-size: 2rem;
}

.lightbox-prev {
  left: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-next {
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  color: var(--text-accent);
}

.lightbox-content img {
  max-width: 100%;
  max-height: 85vh;
  object-fit: contain;
  border-radius: 2px;
}

/* ========== 动画 ========== */
@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  to {
    opacity: 1;
  }
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.4; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

/* 滚动渐入动画 */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

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

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .gallery-grid {
    columns: 2;
  }

  .about-body {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .about-image {
    max-width: 300px;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 240px;
    flex-direction: column;
    background: var(--bg-secondary);
    padding: calc(var(--nav-height) + var(--space-xl)) var(--space-lg) var(--space-lg);
    gap: var(--space-lg);
    transform: translateX(100%);
    transition: transform var(--duration-normal) var(--ease-out-expo);
    border-left: 1px solid var(--border-subtle);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-toggle {
    display: flex;
    z-index: 101;
  }

  .gallery-grid {
    columns: 1;
    max-width: 500px;
    margin: 0 auto;
  }

  .about-stats {
    gap: var(--space-lg);
  }

  .contact-links {
    flex-direction: column;
    align-items: center;
  }

  .hero h1 {
    letter-spacing: 0.02em;
  }
}

@media (max-width: 480px) {
  :root {
    --space-section: clamp(3rem, 2rem + 5vw, 5rem);
  }

  .hero-tagline {
    font-size: var(--text-sm);
  }

  .about-stats {
    flex-wrap: wrap;
  }
}

/* ========== 减幅运动 ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}