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

:root {
  --bg: #ffffff;
  --bg-secondary: #f5f7f6;
  --text: #1a1a2e;
  --text-secondary: #4a4a6a;
  --primary: #2d6a4f;
  --primary-hover: #1b4332;
  --primary-light: #52b788;
  --primary-bg: rgba(45, 106, 79, 0.08);
  --card-bg: #ffffff;
  --card-border: rgba(0, 0, 0, 0.06);
  --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.1);
  --overlay: rgba(0, 0, 0, 0.4);
  --tag-bg: #e8f5e9;
  --tag-text: #2d6a4f;
  --border: #e8eceb;
  --nav-bg: rgba(255, 255, 255, 0.85);
  --footer-text: #8896a6;
  --placeholder-bg: #e8eceb;
  --theme-icon-sun: none;
  --theme-icon-moon: block;
}

[data-theme="dark"] {
  --bg: #0d1b2a;
  --bg-secondary: #14243b;
  --text: #e0e0e0;
  --text-secondary: #8896a6;
  --primary: #52b788;
  --primary-hover: #74c69d;
  --primary-light: #2d6a4f;
  --primary-bg: rgba(82, 183, 136, 0.1);
  --card-bg: #1b2838;
  --card-border: rgba(255, 255, 255, 0.06);
  --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
  --card-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.4);
  --overlay: rgba(0, 0, 0, 0.7);
  --tag-bg: rgba(82, 183, 136, 0.15);
  --tag-text: #52b788;
  --border: #2a3a4e;
  --nav-bg: rgba(13, 27, 42, 0.9);
  --footer-text: #4a5a6e;
  --placeholder-bg: #1e3048;
  --theme-icon-sun: block;
  --theme-icon-moon: none;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans SC', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

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

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

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Navbar ---- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s, border-color 0.3s;
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 1.125rem;
  color: var(--primary);
}

.nav-logo svg {
  width: 22px;
  height: 22px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-links {
  display: flex;
  gap: 20px;
}

.nav-link {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: color 0.2s;
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width 0.25s;
  border-radius: 1px;
}

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

.nav-link:hover::after {
  width: 100%;
}

.theme-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: color 0.2s, border-color 0.2s;
}

.theme-btn:hover {
  color: var(--primary);
  border-color: var(--primary-light);
}

.theme-btn svg {
  width: 18px;
  height: 18px;
}

.theme-btn .sun-icon {
  display: var(--theme-icon-sun);
}

.theme-btn .moon-icon {
  display: var(--theme-icon-moon);
}

/* ---- Hero ---- */
.hero {
  padding: 120px 0 80px;
  text-align: center;
}

.hero-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--primary);
  margin-bottom: 12px;
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 480px;
  margin: 0 auto;
}

/* ---- Sections ---- */
section {
  padding: 72px 0;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 36px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--primary);
  border-radius: 2px;
}

/* ---- Works Grid ---- */
.works {
  background: var(--bg-secondary);
  transition: background 0.3s;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ---- Work Card ---- */
.work-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  cursor: pointer;
  transition: transform 0.25s, box-shadow 0.25s, background 0.3s, border-color 0.3s;
  display: flex;
  flex-direction: column;
}

.work-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
}

.card-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 700;
  margin-bottom: 10px;
}

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

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 20px;
  background: var(--tag-bg);
  color: var(--tag-text);
  transition: background 0.3s, color 0.3s;
}

.card-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---- About ---- */
.about-text {
  font-size: 1.0625rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
}

/* ---- Links ---- */
.links-section {
  background: var(--bg-secondary);
  transition: background 0.3s;
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 20px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-secondary);
  box-shadow: var(--card-shadow);
  transition: transform 0.2s, box-shadow 0.2s, color 0.2s, border-color 0.2s, background 0.3s;
}

.link-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--card-shadow-hover);
  color: var(--primary);
  border-color: var(--primary-light);
}

.link-card svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ---- Modal ---- */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--overlay);
  align-items: center;
  justify-content: center;
  padding: 24px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal-overlay.active {
  display: flex;
}

.modal {
  background: var(--card-bg);
  border-radius: 14px;
  max-width: 640px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  animation: modal-in 0.25s ease-out;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-close {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 10;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: color 0.2s, border-color 0.2s;
}

.modal-close:hover {
  color: var(--primary);
  border-color: var(--primary-light);
}

.modal-close svg {
  width: 18px;
  height: 18px;
}

.modal-body {
  padding: 24px;
}

.modal-title {
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.modal-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 16px;
}

.modal-image-wrapper {
  width: 100%;
  max-height: 360px;
  overflow: hidden;
  border-radius: 14px 14px 0 0;
  background: var(--placeholder-bg);
}

.modal-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.modal-description {
  font-size: 0.9375rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}

.modal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.modal-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 20px;
  border: 1px solid var(--primary);
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--primary);
  transition: background 0.2s, color 0.2s;
}

.modal-link:hover {
  background: var(--primary);
  color: #fff;
}

.modal-link svg {
  width: 16px;
  height: 16px;
}

/* ---- Footer ---- */
.footer {
  text-align: center;
  padding: 32px 24px;
  font-size: 0.8125rem;
  color: var(--footer-text);
  transition: color 0.3s;
}

/* ---- Back to Top ---- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 50;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--card-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s, background 0.3s, border-color 0.3s;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .works-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-title {
    font-size: 2.25rem;
  }
}

@media (max-width: 600px) {
  .works-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding: 100px 0 60px;
  }

  .hero-title {
    font-size: 1.875rem;
  }

  .links-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  section {
    padding: 48px 0;
  }

  .nav-links {
    gap: 14px;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
  }
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar, var(--border));
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Firefox scrollbar */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar, var(--border)) transparent;
}