@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Noto+Serif+Devanagari:wght@400;600;700&display=swap');

:root {
  /* Dark mode is default */
  --bg: #0a0a0a;
  --fg: #e5e5e5;
  --accent: #ffffff;
  --dim: #a0a0a0;
  --border: #1a1a1a;
  --sidebar-bg: #0d0d0d;
  --hover-bg: #161616;
  --tag-bg: #1a1a1a;
  --card-bg: #0f0f0f;

  /* Universal Noto Serif Devanagari */
  --font-serif: "Noto Serif Devanagari", Georgia, Cambria, serif;
  --font-sans: "Noto Serif Devanagari", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --sidebar-width: 280px;
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme='light'] {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --accent: #000000;
  --dim: #666666;
  --border: #eeeeee;
  --sidebar-bg: #fafafa;
  --hover-bg: #f5f5f5;
  --tag-bg: #f0f0f0;
  --card-bg: #ffffff;
}

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

body {
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Layout */
.app-wrapper {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
aside.sidebar {
  width: var(--sidebar-width);
  background-color: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  height: 100vh;
  position: fixed;
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: var(--transition);
}

.logo-container {
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}

.logo-img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
}

nav.categories {
  flex: 1;
}

.nav-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
  display: block;
}

.category-list {
  list-style: none;
}

.category-item {
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--dim);
  cursor: pointer;
  transition: var(--transition);
  margin-bottom: 4px;
}

.category-item:hover {
  background-color: var(--hover-bg);
  color: var(--accent);
}

.category-item.active {
  background-color: var(--hover-bg);
  color: var(--accent);
  font-weight: 600;
}

.sidebar-footer {
  margin-top: auto;
  padding-top: 20px;
}

/* Main Content */
main.content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 60px 40px;
  max-width: 1000px;
  min-height: 100vh;
  transition: var(--transition);
}

.header-top {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 40px;
}

/* Post Cards */
.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100%, 1fr));
  gap: 32px;
}

.post-card {
  padding: 24px;
  background-color: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.post-card:hover {
  border-color: var(--dim);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.pc-meta {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.8rem;
  color: var(--dim);
  font-weight: 500;
}

.pc-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--accent);
  line-height: 1.3;
}

.pc-excerpt {
  color: var(--dim);
  font-size: 1rem;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Theme Toggle Custom */
.theme-btn {
  background: var(--tag-bg);
  border: 1px solid var(--border);
  color: var(--fg);
  padding: 8px 16px;
  border-radius: 20px;
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 600;
  transition: var(--transition);
}

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

/* Post View */
.view-post {
  max-width: 720px;
  margin: 0 auto;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--dim);
  text-decoration: none;
  font-size: 0.9rem;
  margin-bottom: 40px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
  font-family: inherit;
  transition: var(--transition);
}

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

.post-detail-header h1 {
  font-family: var(--font-serif);
  font-size: 3rem;
  margin-bottom: 24px;
  color: var(--accent);
  line-height: 1.1;
}

.post-body {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.8;
}

.post-body p {
  margin-bottom: 24px;
}

.post-body h2,
.post-body h3 {
  font-family: var(--font-sans);
  margin-top: 48px;
  margin-bottom: 20px;
  color: var(--accent);
}

/* Mobile */
@media (max-width: 850px) {
  aside.sidebar {
    width: 0;
    padding: 0;
    overflow: hidden;
    position: fixed;
    transform: translateX(-100%);
  }

  aside.sidebar.open {
    width: 280px;
    padding: 40px 24px;
    transform: translateX(0);
  }

  main.content {
    margin-left: 0;
    padding: 40px 20px;
  }

  .mobile-nav-toggle {
    display: block !important;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    background: var(--accent);
    color: var(--bg);
    width: 50px;
    height: 50px;
    border-radius: 25px;
    border: none;
    font-size: 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  }

  .post-detail-header h1 {
    font-size: 2.2rem;
  }
}

.mobile-nav-toggle {
  display: none;
}