/* ========== CSS Variables & Imports ========== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  /* Colors */
  --primary-green: #4caf50;
  --primary-green-light: #66bb6a;
  --primary-green-dark: #2e7d32;
  --text-primary: #1a1a1a;
  --text-secondary: #404040;
  --text-muted: #666;
  --bg-primary: #fafafa;
  --bg-secondary: #f5f5f5;
  --bg-accent: #f1f8e9;
  
  /* Dark mode colors */
  --dark-bg-primary: #0a0a0a;
  --dark-bg-secondary: #111111;
  --dark-bg-accent: #0d2818;
  --dark-text-primary: #e8e8e8;
  --dark-text-secondary: #c0c0c0;
  --dark-text-muted: #a0a0a0;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Transitions */
  --transition-fast: 0.3s ease;
  --transition-slow: 0.4s ease;
  
  color-scheme: light dark;
}

/* ========== Base Styles ========== */
html {
  background-color: var(--bg-primary);
  transition: background-color var(--transition-fast);
}

html.dark-mode {
  background-color: var(--dark-bg-primary);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  margin: 2em;
  background: transparent;
  color: var(--text-primary);
  opacity: 0;
  line-height: 1.6;
  font-size: 16px;
  transition: all var(--transition-fast);
}

body.page-loaded {
  opacity: 1;
}

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

section {
  margin-bottom: var(--spacing-xl);
}

/* ========== Typography ========== */
h1, h2, h3 {
  transition: color var(--transition-fast);
}

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.02em;
  color: #0f0f0f;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.3;
  margin: var(--spacing-lg) 0 var(--spacing-sm) 0;
  letter-spacing: -0.01em;
  color: #1f1f1f;
}

h3 {
  font-size: clamp(1.125rem, 2vw, 1.25rem);
  font-weight: 500;
  line-height: 1.4;
  margin-bottom: 0.75rem;
  color: #2a2a2a;
}

p {
  font-size: clamp(0.95rem, 1.5vw, 1rem);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
  font-weight: 400;
  transition: color var(--transition-fast);
}

.lead-text {
  font-size: clamp(1.1rem, 2vw, 1.125rem);
  color: #2a2a2a;
  line-height: 1.6;
  font-weight: 400;
}

.subtext {
  font-size: clamp(0.85rem, 1.5vw, 0.9rem);
  color: var(--text-muted);
  font-weight: 400;
}

/* ========== Layout Components ========== */
header, footer {
  background-color: var(--bg-secondary);
  padding: 2.5em 1em 1em 1em;
  text-align: center;
  position: relative;
  transition: all var(--transition-slow);
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
}

footer {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-md) var(--spacing-sm);
}

footer p {
  margin: 0;
  font-size: clamp(0.85rem, 1.5vw, 0.9rem);
  color: var(--text-muted);
}

/* ========== Navigation ========== */
nav {
  margin-top: var(--spacing-md);
}

nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #333;
  font-weight: 500;
  font-size: clamp(0.9rem, 1.5vw, 0.95rem);
  transition: all var(--transition-fast);
  padding: var(--spacing-xs) 0;
  position: relative;
}

nav a:hover {
  color: var(--primary-green);
  transform: translateY(-1px);
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--primary-green);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

nav a:hover::after {
  transform: scaleX(1);
}

/* ========== Home Page Specific ========== */
.intro {
  background-color: var(--bg-secondary);
  padding: 3rem 1rem;
  text-align: center;
  border-radius: 12px;
}

.intro-content {
  margin-bottom: var(--spacing-sm);
}

.intro-content h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin-bottom: 0.75rem;
  background: linear-gradient(135deg, #0f0f0f 0%, var(--primary-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.intro-content p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-md);
  color: #555;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ========== Buttons ========== */
.resume-btn {
  display: inline-block;
  margin-top: var(--spacing-md);
  padding: 0.75rem var(--spacing-md);
  border: 2px solid var(--primary-green);
  color: var(--primary-green);
  font-weight: 600;
  border-radius: 8px;
  background: transparent;
  text-decoration: none;
  font-size: clamp(0.95rem, 1.5vw, 1rem);
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(76, 175, 80, 0.2);
  position: relative;
  overflow: hidden;
}

.resume-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 0.5s ease;
}

.resume-btn:hover {
  background-color: var(--primary-green);
  color: white;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(76, 175, 80, 0.3);
}

.resume-btn:hover::before {
  left: 100%;
}

/* ========== Dark Mode Toggle ========== */
.switch {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  display: inline-block;
  width: 50px;
  height: 26px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: background-color var(--transition-slow);
  border-radius: 26px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  transition: transform var(--transition-slow);
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary-green);
}

input:checked + .slider:before {
  transform: translateX(24px);
}

/* ========== Green Accent Components ========== */
.page-title-gradient {
  background: linear-gradient(135deg, #0f0f0f 0%, var(--primary-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  margin-bottom: 0.75rem;
}

.project-title {
  color: var(--primary-green-dark);
  transition: all var(--transition-fast);
}

.project-title:hover {
  color: #1b5e20;
}

.project-card {
  border: 1px solid #e8f5e8;
  border-radius: 12px;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  background: var(--bg-secondary);
  transition: all var(--transition-fast);
}

.project-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(76, 175, 80, 0.15);
  border-color: var(--primary-green);
}

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

.contact-item {
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-sm);
  background: var(--bg-secondary);
  border-radius: 8px;
  transition: all var(--transition-fast);
}

.contact-item:hover {
  box-shadow: 0 4px 15px rgba(76, 175, 80, 0.1);
}

.contact-link {
  color: var(--primary-green-dark) !important;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.contact-link:hover {
  color: #1b5e20 !important;
  border-bottom-color: var(--primary-green);
}

/* ========== Dark Mode Styles ========== */
html.dark-mode body {
  color: var(--dark-text-primary);
}

html.dark-mode h1 { color: #f5f5f5; }
html.dark-mode h2 { color: var(--dark-text-primary); }
html.dark-mode h3 { color: #d0d0d0; }
html.dark-mode p { color: var(--dark-text-secondary); }
html.dark-mode .lead-text { color: #e0e0e0; }
html.dark-mode .subtext { color: var(--dark-text-muted); }

html.dark-mode header,
html.dark-mode footer {
  background-color: var(--dark-bg-secondary);
  color: var(--dark-text-primary);
  box-shadow: 0 2px 12px rgba(255, 255, 255, 0.05);
}

html.dark-mode footer p { color: var(--dark-text-muted); }
html.dark-mode .intro { background-color: var(--dark-bg-secondary); }

html.dark-mode .intro-content h1 {
  background: linear-gradient(135deg, #ffffff 0%, var(--primary-green) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

html.dark-mode .intro-content p { color: #b0b0b0; }
html.dark-mode nav a { color: var(--dark-text-primary); }
html.dark-mode nav a:hover { color: var(--primary-green-light); }
html.dark-mode .slider { background-color: #444; }

html.dark-mode .resume-btn {
  border-color: var(--primary-green-light);
  color: var(--primary-green-light);
  box-shadow: 0 4px 12px rgba(102, 187, 106, 0.2);
}

html.dark-mode .resume-btn:hover {
  background-color: var(--primary-green-light);
  color: var(--dark-bg-primary);
  box-shadow: 0 6px 20px rgba(102, 187, 106, 0.3);
}

html.dark-mode .page-title-gradient {
  background: linear-gradient(135deg, #ffffff 0%, var(--primary-green-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

html.dark-mode .project-title {
  color: #81c784;
}

html.dark-mode .project-title:hover { color: #a5d6a7; }

html.dark-mode .project-card {
  background: linear-gradient(135deg, #1a1a1a 0%, var(--dark-bg-accent) 100%);
  border-color: var(--primary-green-dark);
}

html.dark-mode .project-card:hover {
  border-color: var(--primary-green-light);
  box-shadow: 0 8px 25px rgba(102, 187, 106, 0.2);
}

html.dark-mode .contact-item {
  background: linear-gradient(135deg, #1a1a1a 0%, var(--dark-bg-accent) 100%);
  border-left-color: var(--primary-green-light);
}

html.dark-mode .contact-item:hover {
  box-shadow: 0 4px 15px rgba(102, 187, 106, 0.15);
}

html.dark-mode .contact-link { color: #81c784 !important; }
html.dark-mode .contact-link:hover {
  color: #a5d6a7 !important;
  border-bottom-color: var(--primary-green-light);
}

/* ========== Links & Accessibility ========== */
a {
  color: #2563eb;
  text-decoration: none;
  transition: all var(--transition-fast);
}

a:hover { color: #1d4ed8; }

html.dark-mode a { color: #60a5fa; }
html.dark-mode a:hover { color: #93c5fd; }

a:focus, button:focus, input:focus {
  outline: 2px solid var(--primary-green);
  outline-offset: 2px;
}

html.dark-mode a:focus,
html.dark-mode button:focus,
html.dark-mode input:focus {
  outline-color: var(--primary-green-light);
}

/* ========== Responsive Design ========== */
@media (max-width: 768px) {
  body {
    margin: 1em;
  }
  
  header, footer {
    padding: 2em 1em;
  }
  
  .intro {
    padding: var(--spacing-lg) var(--spacing-sm);
  }
  
  nav a {
    margin: 0 8px;
  }
  
  .resume-btn {
    padding: 0.6rem 1.2rem;
  }
}