/* ===================================
   RESET & BASE STYLES
   =================================== */

:root {
  /* Colors */
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-tertiary: #1a1a1a;
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #2a2a2a;
  --border-light: #333333;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Layout */
  --max-width: 1200px;
  --container-padding: 1.5rem;
  --border-radius: 8px;
  --border-radius-sm: 4px;
  
  /* Transitions */
  --transition: all 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   TYPOGRAPHY
   =================================== */

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

h1 {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: var(--font-weight-semibold);
}

h2 {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: var(--transition);
}

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

/* ===================================
   LAYOUT COMPONENTS
   =================================== */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 40px;
  height: 2px;
  background-color: var(--accent);
}

/* ===================================
   NAVIGATION
   =================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  padding: var(--spacing-sm) 0;
}

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

.nav-brand {
  font-size: 1.125rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  text-transform: lowercase;
  letter-spacing: -0.025em;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-link {
  font-size: 0.9rem;
  font-weight: var(--font-weight-regular);
  color: var(--text-secondary);
  text-transform: lowercase;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .nav-links {
    gap: var(--spacing-md);
  }
  
  .nav-link {
    font-size: 0.85rem;
  }
}

/* ===================================
   BUTTONS
   =================================== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  border-radius: var(--border-radius);
  transition: var(--transition);
  cursor: pointer;
  border: none;
  font-family: inherit;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: white;
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border: 1px solid var(--border-light);
}

.btn-secondary:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--accent);
  transform: translateY(-1px);
}

/* ===================================
   HERO SECTION
   =================================== */

.hero {
  padding: calc(80px + var(--spacing-3xl)) 0 var(--spacing-3xl);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-content {
  max-width: 700px;
}

.hero-title {
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: var(--font-weight-medium);
  color: var(--accent);
  margin-bottom: var(--spacing-md);
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.125rem);
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

@media (max-width: 768px) {
  .hero {
    padding: calc(60px + var(--spacing-lg)) 0 var(--spacing-lg);
    min-height: auto;
  }
  
  .hero-actions {
    gap: var(--spacing-sm);
  }
  
  .btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.85rem;
  }
}

/* ===================================
   ABOUT SECTION
   =================================== */

.about {
  padding: var(--spacing-3xl) 0;
  background-color: var(--bg-secondary);
}

.about-content p {
  font-size: 1.125rem;
  line-height: 1.7;
  margin-bottom: var(--spacing-xl);
  color: var(--text-secondary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
}

.skill-category h3 {
  font-size: 1.125rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.skill {
  padding: 0.375rem 0.75rem;
  background-color: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: var(--border-radius-sm);
  font-size: 0.875rem;
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.skill:hover {
  background-color: var(--bg-primary);
  border-color: var(--accent);
  color: var(--text-primary);
}

/* ===================================
   PROJECTS SECTION
   =================================== */

.projects {
  padding: var(--spacing-3xl) 0;
}

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

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

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.project-card h3 {
  font-size: 1.25rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.project-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  padding: 0.25rem 0.5rem;
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  border-radius: var(--border-radius-sm);
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  border: 1px solid var(--border);
}

/* ===================================
   WRITING SECTION
   =================================== */

.writing {
  padding: var(--spacing-3xl) 0;
  background-color: var(--bg-secondary);
}

.writing-intro {
  max-width: 700px;
  margin: 0 auto var(--spacing-3xl);
}

.writing-description {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

.newsletter-signup {
  max-width: 700px;
  margin: 0 auto;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  padding: var(--spacing-xl);
}

.newsletter-signup h3 {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.3;
}

.newsletter-form {
  max-width: 100%;
}

.newsletter-input-group {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  align-items: stretch;
}

.newsletter-input {
  flex: 1;
  padding: 0.875rem 1.125rem;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: 1rem;
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  transition: var(--transition);
  min-height: 48px;
}

.newsletter-input::placeholder {
  color: var(--text-muted);
  font-weight: var(--font-weight-regular);
}

.newsletter-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.1);
  background-color: var(--bg-secondary);
}

.newsletter-btn {
  padding: 0.875rem 1.75rem;
  background-color: var(--accent);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family);
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.newsletter-btn:hover:not(:disabled) {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

.newsletter-btn:disabled {
  background-color: var(--text-muted);
  cursor: not-allowed;
  transform: none;
}

.newsletter-loading {
  display: none !important;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: var(--spacing-md) 0;
  align-items: center;
  justify-content: flex-start;
  gap: var(--spacing-xs);
}

.newsletter-loading.show {
  display: flex !important;
}

.newsletter-message {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  font-weight: var(--font-weight-medium);
}

.newsletter-message.success {
  background-color: rgba(34, 197, 94, 0.1);
  color: #22c55e;
  border: 1px solid rgba(34, 197, 94, 0.2);
}

.newsletter-message.error {
  background-color: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

@media (max-width: 768px) {
  .newsletter-input-group {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .newsletter-btn {
    width: 100%;
  }
  
  .newsletter-signup {
    padding: var(--spacing-lg);
  }
  
  .newsletter-input, .newsletter-btn {
    min-height: 44px;
    font-size: 0.9rem;
  }
}

/* ===================================
   CONTACT SECTION
   =================================== */

.contact {
  padding: var(--spacing-3xl) 0;
}

.contact-content {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}

.contact-content p {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-xl);
}

.contact-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  font-weight: var(--font-weight-medium);
  transition: var(--transition);
}

.contact-link:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--accent);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.contact-link i {
  font-size: 1.125rem;
}

@media (max-width: 768px) {
  .contact-links {
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
  }
  
  .contact-link {
    justify-content: center;
    min-width: 200px;
  }
}

/* ===================================
   FOOTER
   =================================== */

.footer {
  padding: var(--spacing-xl) 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0;
}

/* ===================================
   UTILITIES
   =================================== */

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 2.5rem;
    --spacing-3xl: 3rem;
  }
}

/* ===================================
   ACCESSIBILITY
   =================================== */

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

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Selection styles */
::selection {
  background-color: var(--accent);
  color: white;
}