:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-text: #1e293b;
  --color-text-light: #475569;
  --color-text-muted: #94a3b8;
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-primary-dark: #1e40af;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-body: #f8fafc;
  --color-light: #f8fafc;
  --color-text-area: #1e293b;
  --color-text-primary: #1e293b;
  --color-success: #16a34a;
  --color-code-bg: #f1f5f9;
  --color-code-text: #1e293b;
  --color-code-block-bg: #f8fafc;
  --btn-primary-bg: var(--color-primary);
  --btn-primary-text: #ffffff;
  --table-header-bg: #f1f5f9;
  --table-header-text: #1e293b;
  --table-stripe: #f8fafc;
  --table-hover: #f1f5f9;
  --space-section-top: 2rem;
  --space-section-bottom: 2rem;
  --font-mono: 'Fira Code', 'JetBrains Mono', monospace;
}

html[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-text: #e2e8f0;
  --color-text-light: #94a3b8;
  --color-text-muted: #64748b;
  --color-primary: #60a5fa;
  --color-primary-hover: #3b82f6;
  --color-primary-light: #1e3a5f;
  --color-primary-dark: #93c5fd;
  --color-border: #334155;
  --color-border-light: #1e293b;
  --color-body: #0f172a;
  --color-light: #1e293b;
  --color-text-area: #e2e8f0;
  --color-text-primary: #e2e8f0;
  --color-success: #22c55e;
  --color-code-bg: #1e293b;
  --color-code-text: #e2e8f0;
  --color-code-block-bg: #0f172a;
  --btn-primary-bg: var(--color-primary);
  --btn-primary-text: #0f172a;
  --table-header-bg: #1e293b;
  --table-header-text: #e2e8f0;
  --table-stripe: #1e293b;
  --table-hover: #334155;
  --space-section-top: 2rem;
  --space-section-bottom: 2rem;
  --font-mono: 'Fira Code', 'JetBrains Mono', monospace;
}

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

#app { display: flex; flex-direction: column; min-height: 100vh; }

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }

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

html {
  font-size: 16px;
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-hover); }

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.inside-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  padding: 0 1.5rem;
  max-width: 1280px;
  margin: 0 auto;
  gap: 1rem;
}

.site-branding {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.site-branding .site-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.site-branding .site-title:hover {
  color: var(--color-primary);
}

.main-navigation .menu {
  display: flex;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.menu-item a {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  color: var(--color-text-light);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  border-radius: 6px;
  transition: background 150ms, color 150ms;
}

.menu-item a:hover,
.menu-item.current-menu-item a {
  background: var(--color-border-light);
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.lang-switcher {
  position: relative;
}

.lang-switcher-btn {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  height: 36px;
  padding: 0 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-text-light);
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 600;
  transition: background 150ms, color 150ms, border-color 150ms;
}

.lang-switcher-btn:hover {
  background: var(--color-border-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.lang-flag { font-size: 1rem; line-height: 1; }
.lang-arrow { font-size: 0.65rem; opacity: 0.5; transition: opacity 150ms; }
.lang-switcher-btn:hover .lang-arrow { opacity: 1; }

.lang-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  z-index: 200;
  overflow: hidden;
  padding: 0.3rem;
}

.lang-dropdown.open {
  display: block;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--color-text);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 120ms;
}

.lang-option:hover {
  background: var(--color-border-light);
}

.lang-option.current {
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 600;
}

.lang-name {
  flex: 1;
  text-align: left;
}

.lang-code {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

.lang-option.current .lang-code {
  color: var(--color-primary);
}

.theme-toggle-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-text-light);
  cursor: pointer;
  font-size: 0.85rem;
  transition: background 150ms, color 150ms;
}

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

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  padding: 0.25rem;
  color: var(--color-text);
}

.app-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.site-content {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  padding: 2rem 1.5rem;
  flex: 1;
}

.site-content.layout-home {
  padding: 0;
  max-width: none;
}

.site-content.layout-post article {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 2rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.entry-title { font-size: 2rem; font-weight: 700; line-height: 1.3; margin: 0 0 1rem; color: var(--color-text); }

h1 { font-size: 1.875rem; font-weight: 700; margin-bottom: 1rem; }
h2 { font-size: 1.5rem; font-weight: 600; margin-top: 2rem; margin-bottom: 0.75rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--color-border); }
h3 { font-size: 1.2rem; font-weight: 600; margin-top: 1.5rem; margin-bottom: 0.5rem; }

p { margin-bottom: 1rem; }
ul, ol { padding-left: 1.5rem; margin-bottom: 1rem; }
li { margin-bottom: 0.25rem; }

hr { border: none; border-top: 1px solid var(--color-border); margin: 2rem 0; }

blockquote {
  border-left: 4px solid var(--color-primary);
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  background: var(--color-border-light);
  border-radius: 0 4px 4px 0;
  color: var(--color-text-light);
}

code {
  font-family: 'Fira Code', 'JetBrains Mono', monospace;
  font-size: 0.88em;
  background: var(--color-border-light);
  padding: 0.2em 0.4em;
  border-radius: 4px;
}

pre {
  background: var(--color-border-light);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  max-width: 100%;
  font-size: 0.88rem;
  line-height: 1.5;
}

pre code { display: block; background: none; padding: 0; white-space: pre; word-break: normal; overflow-wrap: normal; }

table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: 0.93rem; }
th, td { padding: 0.6rem 0.75rem; border: 1px solid var(--color-border); text-align: left; }
th { background: var(--color-border-light); font-weight: 600; }
tbody tr:nth-child(even) { background: #fafafa; }

html[data-theme="dark"] tbody tr:nth-child(even) { background: rgba(255,255,255,0.02); }

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
  padding: 1rem 1.5rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--color-text-light);
}

.site-footer a { color: var(--color-primary); }

.screen-reader-text, .skip-link {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.skip-link:focus {
  top: 0; left: 0; z-index: 9999; width: auto; height: auto; clip: auto;
  padding: 0.5rem 1rem; background: var(--color-text); color: var(--color-surface); font-size: 0.88rem;
}

@media (max-width: 768px) {
  .inside-header { padding: 0 1rem; }
  .menu { display: none !important; }
  .menu.mobile-open {
    display: flex !important;
    flex-direction: column;
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0.5rem 1rem;
    gap: 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 99;
  }
  .menu.mobile-open .menu-item a {
    padding: 0.75rem;
    border-radius: 0;
    border-bottom: 1px solid var(--color-border-light);
  }
  .mobile-menu-toggle { display: block; }
  .site-content { padding: 1rem; }
}

@media (max-width: 1024px) {
  .site-content.layout-home { padding: 0; }
}