:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-border: #e5e5e5;
  --color-text: #1a1a1a;
  --color-text-secondary: #6b6b6b;
  --color-accent: #1a1a1a;
  --color-accent-hover: #333;
  --color-muted: #f0f0f0;
  --color-tag-bg: #f0f0f0;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --header-height: 64px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", "Noto Sans Mono", monospace;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
}

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

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(250, 250, 250, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.site-logo span {
  font-weight: 300;
  color: var(--color-text-secondary);
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.2s;
  position: relative;
}

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

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
}

.nav-cta {
  background: var(--color-accent);
  color: #fff !important;
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  font-size: 13px !important;
  font-weight: 600 !important;
  transition: background 0.2s;
}

.nav-cta:hover {
  background: var(--color-accent-hover);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--color-text);
}

.main-content {
  padding-top: var(--header-height);
}

.section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 80px 24px;
}

.section-header {
  margin-bottom: 48px;
}

.section-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-top: 12px;
  max-width: 600px;
  line-height: 1.5;
}

.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 120px 24px 80px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  min-height: 80vh;
}

.hero-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-text-secondary);
  margin-bottom: 16px;
  padding: 4px 12px;
  border: 1px solid var(--color-border);
  border-radius: 100px;
}

.hero-title {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -2px;
  line-height: 1.1;
  margin-bottom: 20px;
}

.hero-title em {
  font-style: normal;
  text-decoration: underline;
  text-underline-offset: 8px;
  text-decoration-thickness: 3px;
  text-decoration-color: var(--color-text);
}

.hero-desc {
  font-size: 18px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 480px;
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-family: inherit;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

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

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-text);
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-visual-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-muted);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 14px;
  gap: 12px;
  border: 1px solid var(--color-border);
}

.hero-visual-placeholder svg {
  width: 48px;
  height: 48px;
  opacity: 0.4;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.work-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.work-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.06);
}

.work-card-image {
  aspect-ratio: 16/10;
  background: var(--color-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  font-size: 13px;
  overflow: hidden;
}

.work-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.work-card-body {
  padding: 20px;
}

.work-card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.work-card-tag {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 10px;
  background: var(--color-tag-bg);
  border-radius: 100px;
  color: var(--color-text-secondary);
}

.work-card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 6px;
  letter-spacing: -0.3px;
}

.work-card-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: transform 0.2s;
}

.service-card:hover {
  transform: translateY(-2px);
}

.service-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  color: var(--color-text);
}

.service-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.service-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
}

.blog-card {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 32px;
}

.blog-card-date {
  font-size: 12px;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.blog-card-title {
  font-size: 22px;
  font-weight: 600;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
  line-height: 1.3;
}

.blog-card-title a {
  transition: color 0.2s;
}

.blog-card-title a:hover {
  color: var(--color-text-secondary);
}

.blog-card-excerpt {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.blog-card-tags {
  display: flex;
  gap: 6px;
  margin-top: 12px;
}

.blog-card-tag {
  font-size: 11px;
  font-weight: 500;
  padding: 2px 10px;
  background: var(--color-tag-bg);
  border-radius: 100px;
  color: var(--color-text-secondary);
}

.blog-full-list {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.about-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}

.about-text h2 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.about-text p {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 32px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: 12px;
}

.contact-method svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  color: var(--color-text-secondary);
}

.contact-method-label {
  font-size: 13px;
  color: var(--color-text-secondary);
  display: block;
}

.contact-method-value {
  font-size: 15px;
  font-weight: 500;
}

.contact-qr {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.qr-placeholder {
  width: 140px;
  height: 140px;
  margin: 0 auto 12px;
  background: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--color-text-secondary);
}

.qr-placeholder svg {
  width: 32px;
  height: 32px;
  opacity: 0.5;
}

.qr-label {
  font-size: 12px;
  font-weight: 500;
}

.qr-hint {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.site-footer {
  border-top: 1px solid var(--color-border);
  padding: 40px 24px;
  margin-top: 40px;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-copy {
  font-size: 13px;
  color: var(--color-text-secondary);
}

.footer-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.footer-links a {
  font-size: 13px;
  color: var(--color-text-secondary);
  transition: color 0.2s;
}

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

.post-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 80px 24px;
}

.post-header {
  margin-bottom: 40px;
}

.post-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
  transition: color 0.2s;
}

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

.post-date {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.post-title {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: 12px;
}

.post-meta {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.post-content {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text);
}

.post-content p {
  margin-bottom: 20px;
}

.post-content h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 40px 0 16px;
  letter-spacing: -0.3px;
}

.post-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 32px 0 12px;
}

.post-content ul,
.post-content ol {
  margin-bottom: 20px;
  padding-left: 24px;
}

.post-content li {
  margin-bottom: 8px;
}

.post-content blockquote {
  border-left: 3px solid var(--color-text);
  padding-left: 20px;
  margin: 24px 0;
  color: var(--color-text-secondary);
  font-style: italic;
}

.post-content code {
  font-family: var(--font-mono);
  font-size: 14px;
  background: var(--color-muted);
  padding: 2px 8px;
  border-radius: 4px;
}

.post-content pre {
  background: var(--color-muted);
  padding: 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin-bottom: 20px;
}

.post-content pre code {
  background: none;
  padding: 0;
}

.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.filter-btn {
  padding: 6px 16px;
  border: 1px solid var(--color-border);
  border-radius: 100px;
  background: transparent;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
  color: var(--color-text-secondary);
}

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

.filter-btn.active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.page-hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 120px 24px 60px;
}

.page-hero .section-title {
  font-size: 48px;
}

.page-hero .section-subtitle {
  font-size: 18px;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
  }

  .nav-links.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 100px 24px 60px;
    gap: 32px;
    min-height: auto;
  }

  .hero-visual {
    order: 0;
  }

  .hero-title {
    font-size: 36px;
    letter-spacing: -1px;
  }

  .hero-desc {
    font-size: 16px;
  }

  .section-title {
    font-size: 28px;
  }

  .section {
    padding: 60px 24px;
  }

  .works-grid,
  .services-grid,
  .blog-grid {
    grid-template-columns: 1fr;
  }

  .about-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }

  .page-hero .section-title {
    font-size: 36px;
  }

  .post-title {
    font-size: 28px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .section-title {
    font-size: 24px;
  }
}