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

:root {
  --background: oklch(0.99 0 0);
  --foreground: oklch(0 0 0);
  --muted-foreground: oklch(0.44 0 0);
  --border: oklch(0.92 0 0);
  --accent: oklch(0.94 0 0);
  --accent-foreground: oklch(0 0 0);
  --radius: 0.5rem;
  --font-sans: "Geist Variable", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

html.dark,
.dark {
  --background: oklch(0 0 0);
  --foreground: oklch(1 0 0);
  --muted-foreground: oklch(0.72 0 0);
  --border: oklch(0.26 0 0);
  --accent: oklch(0.32 0 0);
  --accent-foreground: oklch(1 0 0);
}

body {
  font-family: var(--font-sans);
  background: var(--background);
  color: var(--foreground);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "rlig" 1, "calt" 1;
  scroll-behavior: smooth;
}

/* Header/Navbar Styles */
header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  width: 100%;
  justify-content: center;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
  background: rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(10px);
  transition: all 0.2s;
}

html.dark header,
.dark header {
  border-bottom-color: rgba(255, 255, 255, 0.1);
  background: rgba(0, 0, 0, 0.5);
}

.navbar-container {
  display: flex;
  height: 4rem;
  width: 100%;
  align-items: center;
  padding: 1rem;
}

@media (min-width: 640px) {
  .navbar-container {
    padding: 2rem;
  }
}

@media (min-width: 768px) {
  .navbar-container {
    max-width: 768px;
  }
}

@media (min-width: 1536px) {
  .navbar-container {
    max-width: 1280px;
  }
}

.navbar-logo {
  display: none;
  align-items: center;
  margin-right: 1rem;
  text-decoration: none;
  color: var(--foreground);
}

@media (min-width: 640px) {
  .navbar-logo {
    display: flex;
  }
}

.navbar-logo img {
  width: 2rem;
  height: 2rem;
}

.navbar-logo span {
  margin-left: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
}

.navbar-nav {
  display: none;
  flex: 1;
  align-items: center;
  justify-content: flex-end;
  height: 4rem;
  margin-right: 2rem;
  font-size: 1rem;
  font-weight: 500;
}

@media (min-width: 640px) {
  .navbar-nav {
    display: flex;
  }
}

.navbar-nav a {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--muted-foreground);
  text-decoration: none;
  transition: all 0.2s;
}

.navbar-nav a:hover {
  font-weight: 600;
  color: var(--foreground);
}

.navbar-nav a.active {
  font-weight: 600;
  color: var(--foreground);
}

.navbar-actions {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .navbar-actions {
    flex: none;
  }
}

.navbar-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--foreground);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.navbar-button:hover {
  background: var(--accent);
  color: var(--accent-foreground);
}

.navbar-button svg,
.navbar-button img {
  width: 1rem;
  height: 1rem;
}

.navbar-button .icon-github-light,
.navbar-button .icon-user-cog-light {
  display: block;
}

html.dark .navbar-button .icon-github-light,
.dark .navbar-button .icon-github-light,
html.dark .navbar-button .icon-user-cog-light,
.dark .navbar-button .icon-user-cog-light {
  display: none;
}

.navbar-button .icon-github-dark,
.navbar-button .icon-user-cog-dark {
  display: none;
}

html.dark .navbar-button .icon-github-dark,
.dark .navbar-button .icon-github-dark,
html.dark .navbar-button .icon-user-cog-dark,
.dark .navbar-button .icon-user-cog-dark {
  display: block;
}

.theme-toggle {
  position: relative;
}

.theme-icon {
  width: 1.2rem;
  height: 1.2rem;
  transition: all 0.3s;
}

/* 亮色模式：显示太阳图标（点击切换到暗色） */
.theme-icon-moon-light,
.theme-icon-moon-dark {
  display: none;
}

.theme-icon-sun-light {
  display: inline-flex;
  transform: scale(1) rotate(0deg);
}

.theme-icon-sun-dark {
  display: none;
}

/* 暗色模式：显示月亮图标（点击切换到亮色） */
html.dark .theme-icon-sun-light,
.dark .theme-icon-sun-light {
  display: none;
  transform: scale(0) rotate(-90deg);
}

html.dark .theme-icon-moon-dark,
.dark .theme-icon-moon-dark {
  display: inline-flex;
  transform: scale(1) rotate(0deg);
}

.mobile-menu-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--background);
  color: var(--foreground);
  cursor: pointer;
  transition: all 0.2s;
}

@media (min-width: 640px) {
  .mobile-menu-button {
    display: none;
  }
}

.mobile-menu-button:hover {
  background: var(--accent);
}

.mobile-menu-button img {
  width: 1rem;
  height: 1rem;
}

.mobile-menu-button .icon-menu-light {
  display: block;
}

html.dark .mobile-menu-button .icon-menu-light,
.dark .mobile-menu-button .icon-menu-light {
  display: none;
}

.mobile-menu-button .icon-menu-dark {
  display: none;
}

html.dark .mobile-menu-button .icon-menu-dark,
.dark .mobile-menu-button .icon-menu-dark {
  display: block;
}

.mobile-menu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 40;
  display: none;
  width: 100%;
  height: 100vh;
  background: rgba(0, 0, 0, 0.5);
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

.mobile-menu-overlay.open {
  display: block;
  opacity: 1;
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  display: none;
  width: 100%;
  max-width: 20rem;
  height: 100vh;
  background: var(--background);
  padding: 1.5rem;
  box-shadow: 2px 0 8px rgba(0, 0, 0, 0.1);
  transform: translateX(-100%);
  transition: transform 0.3s ease-in-out;
}

.mobile-menu.open {
  display: block;
  transform: translateX(0);
}

.mobile-menu-header {
  margin-bottom: 2rem;
}

.mobile-menu-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.mobile-menu-description {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

.mobile-menu-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: var(--radius);
  background: transparent;
  color: var(--foreground);
  cursor: pointer;
}

.mobile-menu-close img {
  width: 1rem;
  height: 1rem;
}

.mobile-menu-close .icon-close-light {
  display: block;
}

html.dark .mobile-menu-close .icon-close-light,
.dark .mobile-menu-close .icon-close-light {
  display: none;
}

.mobile-menu-close .icon-close-dark {
  display: none;
}

html.dark .mobile-menu-close .icon-close-dark,
.dark .mobile-menu-close .icon-close-dark {
  display: block;
}

.mobile-menu-nav {
  display: grid;
  gap: 1rem;
}

.mobile-menu-nav a {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--foreground);
  text-decoration: none;
  transition: all 0.2s;
}

.mobile-menu-nav a:hover {
  background: var(--accent);
}

.mobile-menu-nav a.active {
  background: var(--foreground);
  color: var(--background);
}

/* Footer Styles */
footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 5;
  padding: 1.5rem;
  background: var(--background);
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;
  font-size: 0.875rem;
  color: var(--muted-foreground);
}

@media (min-width: 768px) {
  .footer-content {
    flex-direction: row;
    gap: 1rem;
  }
}

.footer-link {
  display: flex;
  align-items: center;
  color: var(--muted-foreground);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-link:hover {
  color: var(--foreground);
}

.footer-copyright {
  order: 3;
}

@media (min-width: 768px) {
  .footer-copyright {
    order: 3;
  }
}

/* Main Content */
main {
  min-height: calc(100vh - 64px - 80px);
  padding-bottom: 80px;
}

.container {
  position: relative;
  display: grid;
  min-height: calc(100vh - 64px - 80px);
  place-content: center;
}

.hero-section {
  display: flex;
  min-height: 100%;
  max-width: 768px;
  flex-direction: column;
  justify-content: center;
  gap: 1.25rem;
  padding: 1.5rem;
}

@media (min-width: 768px) {
  .hero-section {
    padding: 2.5rem;
  }
}

@media (min-width: 1536px) {
  .hero-section {
    max-width: 1280px;
  }
}

.greeting {
  font-size: 1.5rem;
  letter-spacing: 0.1em;
}

@media (min-width: 768px) {
  .greeting {
    font-size: 3rem;
  }
}

.nickname {
  background: linear-gradient(to right, rgb(34, 211, 238), rgb(59, 130, 246));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: 0.1em;
}

@media (min-width: 768px) {
  .nickname {
    font-size: 6rem;
  }
}

.type-intro {
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  min-height: 1.5em;
}

@media (min-width: 768px) {
  .type-intro {
    font-size: 3rem;
  }
}

.description {
  font-size: 1.5rem;
  letter-spacing: 0.1em;
}

@media (min-width: 768px) {
  .description {
    font-size: 3rem;
  }
}

.description .react {
  font-weight: 600;
  color: #00d8ff;
}

.description .typescript {
  font-weight: 600;
  color: #007acc;
}

.sub-description {
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--muted-foreground);
}

@media (min-width: 768px) {
  .sub-description {
    font-size: 1.5rem;
  }
}

.button-group {
  display: flex;
  gap: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  transition: all 0.2s;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--background);
  color: var(--foreground);
  box-shadow: 0px 1px 2px 0px rgba(0, 0, 0, 0.09);
}

.button:hover {
  background: var(--accent);
  color: var(--accent-foreground);
}

.social-list {
  display: flex;
  gap: 1rem;
  list-style: none;
}

.social-item {
  position: relative;
}

.social-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--background);
  color: var(--foreground);
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
  box-shadow: 0px 1px 2px 0px rgba(0, 0, 0, 0.09);
}

.social-button:hover {
  background: var(--accent);
  color: var(--accent-foreground);
}

.social-button svg,
.social-button img {
  width: 1rem;
  height: 1rem;
  pointer-events: none;
}

.tooltip {
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  margin-bottom: 0.5rem;
  padding: 0.375rem 0.75rem;
  background: var(--foreground);
  color: var(--background);
  border-radius: var(--radius);
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.social-item:hover .tooltip {
  opacity: 1;
}

.cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: currentColor;
  animation: blink 1s infinite;
  margin-left: 2px;
}

@keyframes blink {
  0%, 50% {
    opacity: 1;
  }
  51%, 100% {
    opacity: 0;
  }
}

.icon {
  display: inline-block;
  width: 1em;
  height: 1em;
  vertical-align: middle;
}

/* Icon theme switching */
.icon-github-light,
.icon-menu-light,
.icon-close-light,
.icon-user-cog-light,
.icon-x-twitter-light {
  display: block;
}

html.dark .icon-github-light,
.dark .icon-github-light,
html.dark .icon-menu-light,
.dark .icon-menu-light,
html.dark .icon-close-light,
.dark .icon-close-light,
html.dark .icon-user-cog-light,
.dark .icon-user-cog-light,
html.dark .icon-x-twitter-light,
.dark .icon-x-twitter-light {
  display: none;
}

.icon-github-dark,
.icon-menu-dark,
.icon-close-dark,
.icon-user-cog-dark,
.icon-x-twitter-dark {
  display: none;
}

html.dark .icon-github-dark,
.dark .icon-github-dark,
html.dark .icon-menu-dark,
.dark .icon-menu-dark,
html.dark .icon-close-dark,
.dark .icon-close-dark,
html.dark .icon-user-cog-dark,
.dark .icon-user-cog-dark,
html.dark .icon-x-twitter-dark,
.dark .icon-x-twitter-dark {
  display: block;
}

/* Gmail图标：亮色模式显示黑色，暗色模式显示白色 */
.icon-gmail-light {
  display: block;
}

html.dark .icon-gmail-light,
.dark .icon-gmail-light {
  display: none;
}

.icon-gmail-dark {
  display: none;
}

html.dark .icon-gmail-dark,
.dark .icon-gmail-dark {
  display: block;
}