/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* CSS Custom Properties for theming */
:root {
  --color-bg: #fff;
  --color-bg-secondary: #fbfbfd;
  --color-bg-code: #f5f5f7;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-muted: #86868b;
  --color-border: #d2d2d7;
  --color-border-light: #f5f5f7;
  --color-accent: #0071e3;
  --color-accent-shadow: rgba(0, 113, 227, 0.12);
  --color-shadow: rgba(0, 0, 0, 0.12);
  --color-shadow-subtle: rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] {
  --color-bg: #1c1c1e;
  --color-bg-secondary: #2c2c2e;
  --color-bg-code: #3a3a3c;
  --color-text: #f5f5f7;
  --color-text-secondary: #a1a1a6;
  --color-text-muted: #8e8e93;
  --color-border: #48484a;
  --color-border-light: #3a3a3c;
  --color-accent: #409cff;
  --color-accent-shadow: rgba(64, 156, 255, 0.2);
  --color-shadow: rgba(0, 0, 0, 0.4);
  --color-shadow-subtle: rgba(0, 0, 0, 0.2);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", sans-serif;
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.022em;
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* Container */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header and Navigation */
header {
  background-color: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: 24px 0 32px;
  margin-bottom: 48px;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
}

.logo a {
  font-size: 1.625rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.015em;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 30px;
}

.nav-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.3s ease;
  font-size: 17px;
}

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

/* Theme Toggle Button */
.theme-toggle {
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: 12px;
  padding: 10px 18px;
  cursor: pointer;
  font-size: 1.5rem;
  line-height: 1;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-shadow);
}

.theme-toggle:focus-visible {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-shadow);
}

/* Search Container - Large and Prominent */
.search-container {
  position: relative;
  width: 100%;
  max-width: 100%;
}

#search-input {
  width: 100%;
  padding: 20px 28px;
  font-size: 1.25rem;
  border: 2px solid var(--color-border);
  border-radius: 12px;
  outline: none;
  transition: all 0.3s ease;
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  font-weight: 400;
  letter-spacing: -0.022em;
}

#search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-shadow);
  background-color: var(--color-bg);
}

#search-results {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  margin-top: 8px;
  max-height: 450px;
  overflow-y: auto;
  box-shadow: 0 8px 16px var(--color-shadow), 0 0 1px var(--color-shadow-subtle);
  display: none;
  z-index: 1000;
}

#search-results.active {
  display: block;
}

.search-result-item {
  padding: 16px 24px;
  border-bottom: 1px solid var(--color-border-light);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.search-result-item:hover {
  background-color: var(--color-bg-secondary);
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-title {
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 6px;
  font-size: 17px;
  letter-spacing: -0.022em;
}

.search-result-excerpt {
  color: var(--color-text-secondary);
  font-size: 15px;
  line-height: 1.5;
}

.search-no-results {
  padding: 24px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 17px;
}

/* Main Content */
main {
  min-height: calc(100vh - 300px);
  padding: 40px 0;
}

article {
  background: var(--color-bg);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin: 32px 0 20px;
  line-height: 1.2;
  color: var(--color-text);
  font-weight: 600;
  letter-spacing: -0.015em;
}

h1.title {
  font-size: 3rem;
  margin-top: 0;
  margin-bottom: 12px;
  font-weight: 700;
  letter-spacing: -0.025em;
}

h2 {
  font-size: 2.25rem;
  border-bottom: 2px solid var(--color-border-light);
  padding-bottom: 12px;
  margin-top: 48px;
}

h3 {
  font-size: 1.75rem;
  margin-top: 40px;
}

p {
  margin-bottom: 24px;
  line-height: 1.6;
}

.date {
  color: var(--color-text-muted);
  font-size: 17px;
  margin-bottom: 32px;
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Code */
code {
  background-color: var(--color-bg-code);
  padding: 3px 8px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Monaco', 'Menlo', 'Courier New', monospace;
  font-size: 15px;
  color: var(--color-text);
}

pre {
  background-color: var(--color-bg-code);
  padding: 24px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 24px;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
}

/* Lists */
ul, ol {
  margin-bottom: 24px;
  padding-left: 40px;
  line-height: 1.6;
}

li {
  margin-bottom: 10px;
}

/* Blog Post List */
.post-list {
  list-style: none;
  padding: 0;
}

.post-list-item {
  margin-bottom: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border-light);
}

.post-list-item:last-child {
  border-bottom: none;
}

.post-list-item h2 {
  border: none;
  padding: 0;
  margin-bottom: 10px;
}

.post-list-item .date {
  margin-bottom: 10px;
}

/* Footer */
footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
  margin-top: 64px;
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 15px;
}

/* Responsive Design */
@media (max-width: 768px) {
  nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }

  .nav-links {
    gap: 20px;
  }

  h1.title {
    font-size: 2rem;
  }

  #search-input {
    font-size: 1rem;
    padding: 15px 20px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 15px;
  }

  .nav-links {
    flex-wrap: wrap;
    gap: 15px;
  }

  h1.title {
    font-size: 1.75rem;
  }
}