:root {
  --primary: #00695c;
  --accent: #ff5722;
  --bg-light: #f0f5f4;
  --text-dark: #212121;
  --card-bg: #fff;
  --border-color: #e0e0e0;
  --shadow-color: rgba(0, 105, 92, 0.1);
  --secondary-text: #666;
  --nav-bg: rgba(255, 255, 255, 0.98);
  --nav-overlay: rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] {
  --primary: #26a69a;
  --accent: #ff7043;
  --bg-light: #121212;
  --text-dark: #e0e0e0;
  --card-bg: #1e1e1e;
  --border-color: #333;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --secondary-text: #b0b0b0;
  --nav-bg: rgba(30, 30, 30, 0.98);
  --nav-overlay: rgba(0, 0, 0, 0.7);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Manrope', sans-serif;
  background: var(--bg-light);
  color: var(--text-dark);
  transition: background 0.3s, color 0.3s;
  line-height: 1.6;
}

.site-header {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem clamp(1rem, 4vw, 2rem);
  background: linear-gradient(135deg, var(--primary), #004d40);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  z-index: 999;
}

.site-header .hamburger-btn,
.site-header .theme-toggle {
  font-family: 'Poppins', sans-serif;
}

.site-header .hamburger-btn {
  flex: 0 0 auto;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  transition: background 0.3s;
  padding: 8px;
}

.site-header .hamburger-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.site-header .hamburger-btn span {
  display: block;
  width: 24px;
  height: 3px;
  background: #fff;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.site-header .hamburger-btn.active span:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.site-header .hamburger-btn.active span:nth-child(2) {
  opacity: 0;
}

.site-header .hamburger-btn.active span:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

.site-header .logo-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex: 1;
  justify-content: center;
}

.site-header .logo-clickable {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #fff;
  transition: transform 0.2s;
}

.site-header .logo-clickable:hover {
  transform: scale(1.05);
}

.site-header .logo {
  width: clamp(32px, 8vw, 48px);
  height: clamp(32px, 8vw, 48px);
}

.site-header .logo-section h1 {
  margin: 0;
  color: #fff;
  font-family: 'Poppins', sans-serif;
  font-size: clamp(1.2rem, 4vw, 1.8rem);
  line-height: 1.2;
}

.site-header .theme-toggle {
  flex: 0 0 auto;
  background: rgba(255, 255, 255, 0.15);
  border: none;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  padding: 0;
}

.site-header .theme-toggle:hover {
  background: rgba(255, 255, 255, 0.25);
}

.site-header .theme-icon {
  display: none;
}

.site-header .theme-icon.moon {
  display: block;
}

[data-theme="dark"] .site-header .theme-icon.sun {
  display: block;
}

[data-theme="dark"] .site-header .theme-icon.moon {
  display: none;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: var(--nav-overlay);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, background 0.3s;
}

.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}

[data-site-nav] {
  position: fixed;
  top: 0;
  left: 0;
  width: min(300px, 80vw);
  height: 100%;
  background: var(--nav-bg);
  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.2);
  z-index: 1001;
  transform: translateX(-100%);
  transition: transform 0.3s;
  overflow: hidden;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

[data-site-nav].active {
  transform: translateX(0);
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--primary);
  flex: 0 0 auto;
}

.sidebar-header h4 {
  color: var(--primary);
  font-family: 'Poppins', sans-serif;
  font-size: 1.3rem;
  font-weight: 700;
}

.close-nav {
  background: none;
  border: none;
  font-size: 1.8rem;
  color: var(--text-dark);
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: background 0.2s;
}

.close-nav:hover {
  background: var(--border-color);
}

footer {
  text-align: center;
  padding: 2rem;
  background: var(--card-bg);
  color: var(--secondary-text);
  font-family: 'Manrope', sans-serif;
  font-size: 0.9rem;
  margin-top: 3rem;
}

::-webkit-scrollbar {
  width: 5px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: #004d40;
}

@media (max-width: 520px) {
  .site-header {
    padding: 0.85rem 0.75rem;
  }
}