/* ============================================
   Lake & Ocean Design System
   Connecting Miami & Chicago through water
   ============================================ */

/* ============================================
   CSS Custom Properties (Theme Variables)
   ============================================ */

:root {
  /* Miami Summer (Light Mode) Colors */
  --color-bg: #FFFCF7;
  --color-text: #0F172A;
  --color-text-muted: #475569;
  --color-accent: #0D9488;
  --color-accent-hover: #0F766E;
  --color-secondary: #D4C4A8;
  --color-highlight: #99F6E4;
  --color-border: #E2E8F0;
  --color-card-bg: #FFFFFF;
  --color-code-bg: #F1F5F9;

  /* Typography */
  --font-heading: 'Cormorant Garamond', 'Georgia', serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', 'Monaco', monospace;

  /* Spacing & Layout */
  --content-max-width: 70ch;
  --wide-max-width: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

/* Chicago Winter (Dark Mode) */
[data-theme="dark"] {
  --color-bg: #0A0F1E;
  --color-text: #F1F5F9;
  --color-text-muted: #94A3B8;
  --color-accent: #14B8A6;
  --color-accent-hover: #2DD4BF;
  --color-secondary: #64748B;
  --color-highlight: #CCFBF1;
  --color-border: #1E293B;
  --color-card-bg: #0F172A;
  --color-code-bg: #1E293B;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
}

/* ============================================
   Base Styles & Reset
   ============================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-top: var(--spacing-xl);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-top: var(--spacing-lg);
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1.125rem;
}

p {
  margin-bottom: var(--spacing-md);
  max-width: var(--content-max-width);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast), color var(--transition-fast);
}

a:hover,
a:focus {
  color: var(--color-accent-hover);
  border-bottom-color: var(--color-accent-hover);
}

a:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

blockquote {
  margin: var(--spacing-lg) 0;
  padding-left: var(--spacing-md);
  border-left: 4px solid var(--color-accent);
  color: var(--color-text-muted);
  font-style: italic;
}

/* ============================================
   Skip to Content Link (Accessibility)
   ============================================ */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: var(--spacing-xs) var(--spacing-md);
  text-decoration: none;
  border-bottom: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   Header & Navigation
   ============================================ */

.site-header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 252, 247, 0.95);
}

[data-theme="dark"] .site-header {
  background-color: rgba(10, 15, 30, 0.95);
}

.nav-container {
  max-width: var(--wide-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.site-title {
  font-family: var(--font-heading);
  font-size: 1.75rem;
  font-weight: 600;
  margin: 0;
}

.site-title a {
  color: var(--color-text);
  border-bottom: none;
}

.site-title a:hover {
  color: var(--color-accent);
}

.nav-main {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav-main a {
  font-weight: 500;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
}

.nav-main a:hover,
.nav-main a.active {
  border-bottom-color: var(--color-accent);
}

.nav-controls {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

/* Theme Toggle Button */
.theme-toggle,
.lang-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  font-family: var(--font-body);
}

.theme-toggle:hover,
.lang-toggle:hover {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

.theme-toggle:focus,
.lang-toggle:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: var(--spacing-xs);
}

@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .nav-main {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-sm);
  }

  .nav-main.active {
    display: flex;
  }

  .nav-container {
    position: relative;
  }
}

/* ============================================
   Main Content Area
   ============================================ */

.main-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
  min-height: calc(100vh - 400px);
}

.wide-content {
  max-width: var(--wide-max-width);
}

/* ============================================
   Wave Decoration (Horizon Lines)
   ============================================ */

.wave-divider {
  width: 100%;
  height: 2px;
  background: linear-gradient(
    to right,
    transparent,
    var(--color-accent) 20%,
    var(--color-accent) 80%,
    transparent
  );
  margin: var(--spacing-xl) 0;
  opacity: 0.3;
}

.wave-divider.curved {
  height: 60px;
  background: none;
  position: relative;
  overflow: hidden;
}

.wave-divider.curved::before {
  content: '';
  position: absolute;
  width: 200%;
  height: 100%;
  background: var(--color-accent);
  opacity: 0.1;
  border-radius: 50%;
  top: 50%;
  left: -50%;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
  text-align: left;
  padding: var(--spacing-xl) 0;
}

.hero h1 {
  margin-bottom: var(--spacing-sm);
}

.hero .tagline {
  font-size: 1.5rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  font-family: var(--font-heading);
  font-weight: 400;
}

.hero .intro {
  font-size: 1.125rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   Cards & Grid Layouts
   ============================================ */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
}

.card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent);
}

.card h3 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

.card .meta {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
}

.card .tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-md);
}

/* ============================================
   Tags
   ============================================ */

.tag {
  display: inline-block;
  background: var(--color-highlight);
  color: var(--color-accent-hover);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.tag:hover {
  background: var(--color-accent);
  color: white;
  border-bottom: none;
}

/* ============================================
   Blog Post List
   ============================================ */

.post-list {
  list-style: none;
  margin: var(--spacing-lg) 0;
}

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

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

.post-list-item h2 {
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

.post-list-item .post-meta {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

.post-list-item .reading-time {
  margin-left: var(--spacing-sm);
}

.post-list-item .excerpt {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-muted);
}

/* ============================================
   Search
   ============================================ */

.search-container {
  margin: var(--spacing-lg) 0;
}

.search-input {
  width: 100%;
  max-width: 500px;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 1rem;
  font-family: var(--font-body);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-card-bg);
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.search-input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-highlight);
}

.search-input::placeholder {
  color: var(--color-text-muted);
}

/* ============================================
   Code Blocks
   ============================================ */

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--color-code-bg);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--color-text);
}

pre {
  background: var(--color-code-bg);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
  border: 1px solid var(--color-border);
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.code-block-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--color-border);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.code-block-header + pre {
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  margin-top: 0;
}

.copy-button {
  background: var(--color-accent);
  color: white;
  border: none;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  font-family: var(--font-body);
  transition: all var(--transition-fast);
}

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

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  font-family: var(--font-body);
}

.btn:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-bottom: none;
  color: white;
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
}

.btn-secondary:hover {
  background: var(--color-accent);
  color: white;
}

/* ============================================
   Footer
   ============================================ */

.site-footer {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-xl) var(--spacing-md);
  border-top: 1px solid var(--color-border);
  background: var(--color-card-bg);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(
    to right,
    var(--color-accent),
    var(--color-highlight),
    var(--color-accent)
  );
  opacity: 0.5;
}

.footer-content {
  max-width: var(--wide-max-width);
  margin: 0 auto;
  text-align: center;
  color: var(--color-text-muted);
}

.footer-content p {
  margin: var(--spacing-sm) auto;
  max-width: 100%;
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  margin: var(--spacing-md) 0;
}

.social-links a {
  color: var(--color-text-muted);
  font-size: 1.25rem;
  transition: color var(--transition-fast);
  border-bottom: none;
}

.social-links a:hover {
  color: var(--color-accent);
}

/* ============================================
   Profile Image
   ============================================ */

.profile-image {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-accent);
  box-shadow: var(--shadow-lg);
  margin: var(--spacing-lg) 0;
}

/* ============================================
   Utility Classes
   ============================================ */

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

.text-center {
  text-align: center;
}

.text-muted {
  color: var(--color-text-muted);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
  :root {
    font-size: 15px;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .nav-main {
    gap: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }

  .site-header {
    padding: var(--spacing-sm) 0;
  }

  .main-content {
    padding: var(--spacing-lg) var(--spacing-md);
  }
}