/* =================================================================
  MODERN GLASSMORPHISM DESIGN SYSTEM
  Primary theme: dark-first glassmorphism
  ================================================================= */

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  /* Base Colors - Dark-first approach */
  --color-primary: #000000;
  --color-surface: #0f0f0f;
  --color-background: #000000;

  /* Glassmorphism Glass Colors */
  --glass-medium: rgba(255, 255, 255, 0.08);
  --glass-strong: rgba(255, 255, 255, 0.12);

  /* Glassmorphism Border Colors */
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-border-hover: rgba(255, 255, 255, 0.2);

  /* Text Colors */
  --text-primary: rgba(255, 255, 255, 0.95);
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-tertiary: rgba(255, 255, 255, 0.5);

  /* Glow Effects */
  --glow-primary: rgba(255, 255, 255, 0.1);
  --glow-hover: rgba(255, 255, 255, 0.15);
  --glow-active: rgba(255, 255, 255, 0.2);

  /* Shadows */
  --shadow-medium: 0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-strong: 0 16px 64px rgba(0, 0, 0, 0.3);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing Scale */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  /* Helper */
  --radius-round: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  /* Base Colors - Light theme */
  --color-primary: #ffffff;
  --color-surface: #f8f9fa;
  --color-background: #ffffff;

  /* Glassmorphism Glass Colors - Light */
  --glass-medium: rgba(0, 0, 0, 0.06);
  --glass-strong: rgba(0, 0, 0, 0.08);

  /* Glassmorphism Border Colors - Light */
  --glass-border: rgba(0, 0, 0, 0.08);
  --glass-border-hover: rgba(0, 0, 0, 0.15);

  /* Text Colors - Light */
  --text-primary: rgba(0, 0, 0, 0.9);
  --text-secondary: rgba(0, 0, 0, 0.7);
  --text-tertiary: rgba(0, 0, 0, 0.5);

  /* Glow Effects - Light */
  --glow-primary: rgba(0, 0, 0, 0.05);
  --glow-hover: rgba(0, 0, 0, 0.08);
  --glow-active: rgba(0, 0, 0, 0.12);

  /* Shadows - Light */
  --shadow-medium: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-strong: 0 16px 64px rgba(0, 0, 0, 0.15);
}


/* ===== RESET & BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-weight: var(--font-weight-normal);
  color: var(--text-primary);
  background: var(--color-background);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-normal);
  min-height: 100vh;
}

/* Backdrop blur support detection */
@supports (backdrop-filter: blur(10px)) {
  .glass {
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
  }
}

/* ===== GLASSMORPHISM CORE COMPONENTS ===== */
.glass {
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-normal);
}

.glass.strong {
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-medium);
}

.glow {
  position: relative;
}

.glow::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: linear-gradient(135deg, var(--glow-primary), transparent, var(--glow-primary));
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.glow:hover::before {
  opacity: 1;
}

/* ===== LAYOUT COMPONENTS ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section { padding: var(--space-3xl) 0; }



/* ===== HERO SECTION ===== */
.hero {
  padding: var(--space-3xl) 0;
  text-align: center;
  min-height: 70vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-content { max-width: 800px; margin: 0 auto; }

.profile-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: var(--space-xl);
  border: 3px solid var(--glass-border);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-normal);
}

.profile-image:hover {
  transform: scale(1.05);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-strong);
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-md);
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-xl);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glow-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px) scale(1.02);
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-medium);
}

.btn:hover::before {
  opacity: 1;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--glass-border);
}

.btn-outline:hover {
  background: var(--glass-medium);
}

/* ===== CARDS ===== */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: var(--space-xl); margin: var(--space-2xl) 0; }

.card {
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: -1px;
  background: linear-gradient(135deg, var(--glow-primary), transparent, var(--glow-primary));
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  background: var(--glass-medium);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-medium);
}

.card:hover::before {
  opacity: 1;
}

.card h3 {
  color: var(--text-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-md);
  font-size: 1.2rem;
}

.card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ===== EXPERIENCE SECTION LAYOUT ===== */
/* Force two columns for the experience cards on wider screens */
#experience .cards-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-xl);
}

/* Stack on small screens for readability */
@media (max-width: 640px) {
  #experience .cards-grid {
    grid-template-columns: 1fr;
  }
}

/* ===== PROJECTS ===== */
.projects-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: var(--space-xl); }

.project-card {
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-4px);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-medium);
}

.project-image {
  position: relative;
  border-bottom: 1px solid var(--glass-border);
}

.project-image .project-placeholder {
  border-radius: 0;
}

.project-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: var(--space-md);
  background: linear-gradient(180deg, rgba(0,0,0,0) 20%, rgba(0,0,0,0.35) 100%);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-links {
  display: flex;
  gap: var(--space-sm);
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.9rem;
  transition: all var(--transition-fast);
}

.project-link:hover {
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
}

.project-content {
  padding: var(--space-lg);
}

.project-content h3 {
  margin-bottom: var(--space-sm);
}

.project-description {
  margin-bottom: var(--space-md);
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.tech-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 8px;
  font-size: 0.8rem;
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
}

/* ===== CONTACT FORM ===== */
.form-header {
  text-align: center;
  margin-bottom: var(--space-xl);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

.contact-form {
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 960px;
  margin: 0 auto;
}

/* Keep header, form, and footer aligned to the same width */
.contact-form-wrapper {
  max-width: 960px;
  margin: 0 auto;
}
.contact-form-wrapper .form-header,
.contact-form-wrapper .contact-form,
.contact-form-wrapper .form-footer { width: 100%; }

/* Footer note under the contact form */
.form-footer {
  text-align: center;
  margin: var(--space-md) auto 0;
  color: var(--text-tertiary);
}
.form-footer p { margin: 0; font-size: 0.9rem; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* Inputs with icons */
.input-with-icon { position: relative; display: flex; align-items: center; }
.input-with-icon .input-icon {
  position: absolute; left: 12px; width: 18px; height: 18px;
  color: var(--text-tertiary); opacity: 0.8; pointer-events: none;
  display: inline-flex; align-items: center; justify-content: center;
}
.input-with-icon .input-icon svg { width: 18px; height: 18px; }
.input-with-icon .form-control { padding-left: 44px; }
.textarea-with-icon .input-icon { align-self: flex-start; top: 14px; }

.form-control {
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  padding: 0.8rem 1rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  width: 100%;
}

.form-control:focus {
  border-color: var(--glass-border-hover);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.06);
}

.error-message,
.success-message {
  display: none;
  font-size: 0.85rem;
}

.error-message { color: #ff6b6b; }
.success-message { color: #22c55e; }

.character-count {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  margin-top: var(--space-xs);
}

/* Character meter under textarea */
.character-meter {
  height: 6px;
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  margin-top: var(--space-xs);
  overflow: hidden;
}
.character-meter .bar {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, #22c55e, #eab308, #ef4444);
  transition: width 0.2s ease, background-color 0.2s ease;
}

.kvkk-section {
  margin-top: var(--space-lg);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.kvkk-toggle {
  margin-top: var(--space-sm);
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  z-index: 1;
}

.kvkk-toggle:hover {
  color: var(--text-primary);
  background: var(--glass-medium);
}

.kvkk-detail {
  display: none;
  margin-top: var(--space-sm);
  color: var(--text-secondary);
}
.kvkk-detail.open { display: block; }

.checkbox-container {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-sm);
  align-items: start;
}

.custom-checkbox { position: relative; display: inline-block; width: 18px; height: 18px; }
.custom-checkbox input {
  position: absolute;
  left: 0; top: 0;
  width: 18px; height: 18px;
  opacity: 0;
  margin: 0;
  cursor: pointer;
}

.custom-checkbox .checkmark {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  border: 1px solid var(--glass-border);
  background: var(--glass-medium);
  display: inline-block;
  position: relative;
  pointer-events: none;
}

.custom-checkbox input:checked + .checkmark::after {
  content: '';
  position: absolute;
  left: 4px;
  top: 0px;
  width: 6px;
  height: 12px;
  border: solid var(--text-primary);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.submit-btn {
  margin-top: var(--space-lg);
  margin-left: auto;
  margin-right: auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-xl);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.submit-btn:hover {
  transform: translateY(-2px) scale(1.02);
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-medium);
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.loading-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: rgba(255,255,255,0.9);
  border-radius: 50%;
  animation: component-loading-spin 1s linear infinite;
}



/* Contact cards tune */
.section .card h3 { margin-bottom: var(--space-sm); }
.section .card p { margin-bottom: 0; }

/* Responsive tweaks */
@media (max-width: 900px) {
  .form-grid { grid-template-columns: 1fr; }
  .contact-form { padding: var(--space-lg); }
}

/* ===== SKILLS SECTION ===== */
/* Centered, responsive rows with max 4 items per row (inverted pyramid) */
.skills-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xl);
  justify-content: center; /* center rows so last row is centered */
  align-items: stretch;
  margin: var(--space-2xl) 0;
}

.skill-category {
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-normal);
  /* width rules: max 4 columns on large screens */
  flex: 0 1 calc((100% - (3 * var(--space-xl))) / 4);
  min-width: 260px;
  max-width: 420px; /* avoid growing too wide on huge screens */
}

.skill-category:hover {
  background: var(--glass-medium);
  transform: translateY(-2px);
}

.skill-category h4 {
  color: var(--text-primary);
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--space-md);
  font-size: 1rem;
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  padding: var(--space-xs) var(--space-sm);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: var(--glass-strong);
  color: var(--text-primary);
  transform: scale(1.05);
}

.skill-tag img {
  filter: brightness(0.8);
  transition: filter var(--transition-fast);
}

.skill-tag:hover img {
  filter: brightness(1);
}

/* Skills layout responsive breakpoints */
@media (max-width: 1280px) {
  /* Up to 3 per row */
  .skills-grid .skill-category {
    flex-basis: calc((100% - (2 * var(--space-xl))) / 3);
  }
}

@media (max-width: 900px) {
  /* Up to 2 per row */
  .skills-grid .skill-category {
    flex-basis: calc((100% - var(--space-xl)) / 2);
  }
}

@media (max-width: 560px) {
  /* Single column on small screens */
  .skills-grid .skill-category {
    flex-basis: 100%;
    min-width: 0;
  }
}

/* ===== MAIN CONTENT LAYOUT ===== */
main { width: 100%; min-height: calc(100vh - 200px); padding-top: 100px; }

/* Improve touch targets */
.btn {
  min-height: 44px;
  padding: var(--space-md) var(--space-lg);
}

/* Adjust hero layout for mobile */
.hero { padding: var(--space-xl) 0; min-height: 60vh; }

@media (max-width: 480px) {
  .hero {
    padding: var(--space-md) 0;
    min-height: 50vh;
  }

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

  .btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: 0.9rem;
  }
}

/* ===== PERFORMANCE OPTIMIZATIONS ===== */
/* Optimize glassmorphism for better performance */
.glass {
  will-change: auto;
  contain: layout style paint;
}

.glass:hover {
  will-change: transform, backdrop-filter;
}

/* Optimize animations */
.btn,
.card,
.skill-tag {
  will-change: auto;
}

.btn:hover,
.card:hover,
.skill-tag:hover {
  will-change: transform;
}

/* Reduce backdrop filter complexity on mobile for better performance */
@media (max-width: 768px) {
  .glass {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }
}

/* Further reduce effects on low-end devices */
@media (max-width: 480px) {
  .glass {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }

  /* Disable some expensive effects on mobile */
  .glow::before,
  .card::before,
  .btn::before {
    display: none;
  }
}

/* ===== REDUCED MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  /* Disable glassmorphism animations for reduced motion */
  .glass,
  .btn,
  .card {
    transition: none !important;
    animation: none !important;
  }
}

/* ===== PRINT STYLES ===== */
@media print {
  .glass,
  .card,
  .skill-category {
    background: white !important;
    border: 1px solid #ddd !important;
    box-shadow: none !important;
  }
}

/* ===== NAVBAR GLASSMORPHISM DESIGN ===== */

/* Navbar Container */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-md);
  background: rgba(0, 0, 0, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-normal);
}

/* Navbar Inner Container */
nav > div {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md) var(--space-lg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-medium);
  transition: all var(--transition-normal);
}

/* Brand/Logo */
nav a[href="index.html"]:first-of-type {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-decoration: none;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: all var(--transition-fast);
}

nav a[href="index.html"]:first-of-type:hover {
  transform: scale(1.05);
}

/* Navigation Links Container */
nav > div > div {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Navbar Social Media Container */
.navbar-social {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-left: var(--space-md);
  padding-left: var(--space-md);
  border-left: 1px solid var(--glass-border);
}

/* Social media links in navbar */
.navbar-social a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-md);
  color: var(--text-tertiary);
  transition: all var(--transition-fast);
}

.navbar-social a:hover {
  color: var(--text-primary);
  background: var(--glass-strong);
  transform: translateY(-2px) scale(1.1);
  box-shadow: var(--shadow-medium);
}

.navbar-social a svg {
  width: 18px;
  height: 18px;
}

/* ===== THEME TOGGLE BUTTON ===== */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-left: var(--space-sm);
}

.theme-toggle:hover {
  color: var(--text-primary);
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-normal);
}

.theme-toggle:hover svg {
  transform: rotate(180deg);
}

/* Theme toggle icons */
.theme-toggle .sun-icon {
  display: none;
}

.theme-toggle .moon-icon {
  display: block;
}

[data-theme="light"] .theme-toggle .sun-icon {
  display: block;
}

[data-theme="light"] .theme-toggle .moon-icon {
  display: none;
}

/* Navigation Links */
nav a {
  display: inline-flex;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

nav a:not([href="index.html"]:first-of-type):hover {
  color: var(--text-primary);
  background: var(--glass-medium);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

/* Glow effect for navigation links */
nav a:not([href="index.html"]:first-of-type)::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glow-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
  border-radius: inherit;
}

nav a:not([href="index.html"]:first-of-type):hover::before {
  opacity: 1;
}

/* Active navigation link */
nav a.active {
  color: var(--text-primary);
  background: var(--glass-strong);
  border: 1px solid var(--glass-border-hover);
}

/* Responsive Design */
@media (max-width: 768px) {
  nav {
    padding: var(--space-sm);
  }

  nav > div {
    flex-direction: row;
    justify-content: space-between;
    padding: var(--space-md);
  }

  /* Hide desktop navigation on mobile */
  nav > div > div:first-of-type {
    display: none !important;
  }

  /* Show hamburger menu */
  .mobile-menu-toggle {
    display: flex !important;
  }

  /* Mobile menu visibility */
  .mobile-menu {
    display: flex !important;
  }
}

@media (max-width: 480px) {
  nav > div { padding: var(--space-sm) var(--space-md); }
}

/* Removed duplicated/undefined variable-based sections for hero/cards/skills/projects/footer. Keeping single theme. */

/* ===== ABOUT PAGE ===== */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-lg) 0;
}

.timeline::after {
  content: '';
  position: absolute;
  width: 4px;
  background-color: var(--color-primary);
  top: 0;
  bottom: 0;
  left: 50%;
  margin-left: -2px;
  border-radius: 2px;
}

.timeline-item {
  padding: var(--space-md) var(--space-xl);
  position: relative;
  background-color: inherit;
  width: 50%;
}

.timeline-item.left {
  left: 0;
  padding-right: 50px;
}

.timeline-item.right {
  left: 50%;
  padding-left: 50px;
}

.timeline-item::after {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  right: -10px;
  background-color: var(--color-background);
  border: 4px solid var(--color-primary);
  top: 25px;
  border-radius: 50%;
  z-index: 1;
}

.timeline-item.right::after {
  left: -10px;
}

.timeline-content {
  padding: var(--space-lg);
  background-color: var(--color-background);
  position: relative;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-light);
  border: 1px solid var(--glass-border);
}

.timeline-content h3 {
  margin-top: 0;
  color: var(--color-primary);
}

.timeline-date {
  font-weight: var(--font-weight-semibold);
  color: var(--text-tertiary);
  margin-bottom: var(--space-sm);
  font-size: 0.9rem;
}

@media screen and (max-width: 768px) {
  .timeline::after {
    left: 20px;
  }

  .timeline-item {
    width: 100%;
    padding-left: 50px;
    padding-right: 0;
  }

  .timeline-item.left, .timeline-item.right {
    left: 0;
  }

  .timeline-item.right::after, .timeline-item.left::after {
    left: 10px;
  }
}

/* ===== PROJECTS PAGE ===== */
.filter-buttons {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.filter-btn {
  margin: 0 var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--glass-border);
  background: var(--glass-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-round);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-weight: var(--font-weight-medium);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--glass-strong);
  color: var(--text-primary);
  border-color: var(--glass-border-hover);
}

.project-card.hide {
  display: none;
}

/* (Removed duplicate contact page styles relying on undefined color tokens) */

/* ===== UTILITIES ===== */
.text-center { text-align: center; }
.mt-2 { margin-top: 2rem; }

/* ===== KEYFRAMES ===== */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideInUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* Loading spinner keyframes */
@keyframes component-loading-spin {
  to { transform: rotate(360deg); }
}

/* Animate elements on scroll */
.animated {
  animation-duration: 0.8s;
  animation-fill-mode: both;
}

.fadeInUp {
  animation-name: slideInUp;
}

/* Consolidated print styles */
@media print {
  body { background: #fff; color: #000; }
  .section, footer { padding: 20px 0; }
  .btn, .filter-btn { display: none; }
  .card, .project-card, .skill-category { box-shadow: none; border: 1px solid #ccc; }
  .hero { background: none; padding: 20px 0; }
  .hero h1, .subtitle { color: #000; -webkit-text-fill-color: initial; text-shadow: none; }
  .profile-image { border-color: #000; }
}


/* ===== MOBILE MENU (single consolidated version) ===== */
/* Hamburger toggle - hidden on desktop by default */
.mobile-menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.mobile-menu-toggle:hover {
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.mobile-menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.mobile-menu-toggle { gap: 5px; }

/* Remove legacy margin-top spacing between lines */
.mobile-menu-toggle span + span { margin-top: 0; }

/* Transform into an X when active */
.mobile-menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.mobile-menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.mobile-menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile menu overlay container */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 1002; /* above nav (1000) */
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 96px; /* keep clear of fixed navbar */
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: transform var(--transition-slow), opacity var(--transition-slow), visibility var(--transition-slow);
}

.mobile-menu.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-menu-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 400px;
  margin: 0 auto;
  padding: 0 var(--space-md) var(--space-2xl);
}

.mobile-menu a {
  display: block;
  padding: var(--space-lg) var(--space-xl);
  font-size: 1.2rem;
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
  text-align: center;
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
  margin-bottom: var(--space-sm);
}

.mobile-menu a::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, var(--glow-hover), transparent);
  transition: left var(--transition-normal);
}

.mobile-menu a:hover::before { left: 100%; }
.mobile-menu a:hover {
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
  transform: translateY(-2px) scale(1.02);
  box-shadow: var(--shadow-medium);
}
.mobile-menu a.active {
  background: var(--glass-strong);
  color: var(--text-primary);
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-medium);
}

/* Dark/Light overrides */
body.dark-theme .mobile-menu a { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.1); color: rgba(255, 255, 255, 0.95); }
body.dark-theme .mobile-menu a:hover,
body.dark-theme .mobile-menu a.active { background: rgba(255, 255, 255, 0.12); border-color: rgba(255, 255, 255, 0.2); }
[data-theme="light"] .mobile-menu a { background: rgba(0, 0, 0, 0.06); border-color: rgba(0, 0, 0, 0.08); color: rgba(0, 0, 0, 0.9); }
[data-theme="light"] .mobile-menu a:hover,
[data-theme="light"] .mobile-menu a.active { background: rgba(0, 0, 0, 0.08); border-color: rgba(0, 0, 0, 0.15); }

.mobile-menu-social {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--glass-border);
  flex-wrap: wrap;
  max-width: 350px;
  margin-left: auto;
  margin-right: auto;
}

.mobile-menu-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  padding: 0 !important; /* override generic .mobile-menu a padding */
  border-radius: var(--radius-lg);
  color: var(--text-primary); /* stronger contrast for icons */
  text-decoration: none;
  transition: all var(--transition-fast);
  background: var(--glass-medium);
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
  font-size: 0; /* remove text-node spacing influence */
}

.mobile-menu-social a::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--glow-primary), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.mobile-menu-social a:hover::before { opacity: 1; }
.mobile-menu-social a:hover {
  color: var(--text-primary);
  background: var(--glass-strong);
  border-color: var(--glass-border-hover);
  transform: translateY(-3px) scale(1.05);
  box-shadow: var(--shadow-medium);
}

body.dark-theme .mobile-menu-social a { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.1); color: rgba(255, 255, 255, 0.95); }
body.dark-theme .mobile-menu-social a:hover { background: rgba(255, 255, 255, 0.12); border-color: rgba(255, 255, 255, 0.2); color: rgba(255, 255, 255, 1); }
[data-theme="light"] .mobile-menu-social a { background: rgba(0, 0, 0, 0.06); border-color: rgba(0, 0, 0, 0.08); color: rgba(0, 0, 0, 0.9); }
[data-theme="light"] .mobile-menu-social a:hover { background: rgba(0, 0, 0, 0.08); border-color: rgba(0, 0, 0, 0.15); color: rgba(0, 0, 0, 1); }

.mobile-menu-social a svg { width: 24px; height: 24px; display: block; color: inherit; fill: currentColor; transition: transform var(--transition-normal); position: relative; z-index: 1; }
.mobile-menu-social a svg path { fill: currentColor !important; }
.mobile-menu-social a:hover svg { transform: scale(1.1); }

/* Mobile menu theme toggle area */
.mobile-menu-theme-toggle {
  display: flex;
  justify-content: center;
  margin-top: var(--space-xl);
}

.mobile-menu .theme-toggle {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
}

.mobile-menu .theme-toggle svg { width: 24px; height: 24px; }

/* Platform hovers */
.mobile-menu-social a[aria-label="Instagram"]:hover { background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%); border-color: #e6683c; color: #fff; }
.mobile-menu-social a[aria-label="GitHub"]:hover { background: #333; border-color: #666; color: #fff; }
.mobile-menu-social a[aria-label="X/Twitter"]:hover { background: #1da1f2; border-color: #0d8bd9; color: #fff; }
.mobile-menu-social a[aria-label="LinkedIn"]:hover { background: #0077b5; border-color: #005582; color: #fff; }
.mobile-menu-social a[aria-label="YouTube"]:hover { background: #ff0000; border-color: #cc0000; color: #fff; }
.mobile-menu-social a[aria-label="Email"]:hover { background: #ea4335; border-color: #c23321; color: #fff; }

/* Body scroll lock when menu is open */
body.menu-open {
  overflow: hidden;
}

/* ===== MODERN MINIMALIST FOOTER (kept single) ===== */
footer { padding: var(--space-xl) 0 var(--space-lg); background: rgba(0, 0, 0, 0.02); border-top: 1px solid rgba(255, 255, 255, 0.05); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); }
.footer-container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-md); }
.footer-content { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: var(--space-xl); padding: var(--space-lg) 0; }
.footer-brand { text-align: left; }
.footer-brand h3 { font-size: 1.1rem; font-weight: var(--font-weight-semibold); color: var(--text-primary); margin-bottom: var(--space-xs); letter-spacing: -0.02em; }
.footer-brand p { font-size: 0.9rem; color: var(--text-tertiary); margin: 0; font-weight: var(--font-weight-normal); }
.footer-links { display: flex; gap: var(--space-lg); justify-content: center; }
.footer-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; font-weight: var(--font-weight-medium); padding: var(--space-xs) 0; position: relative; transition: all var(--transition-fast); letter-spacing: -0.01em; }
.footer-links a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 1px; background: var(--text-primary); transition: width var(--transition-fast); }
.footer-links a:hover { color: var(--text-primary); transform: translateY(-1px); }
.footer-links a:hover::after { width: 100%; }
.footer-social { display: flex; gap: var(--space-sm); justify-content: flex-end; align-items: center; }
.footer-social a { display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px; background: rgba(255, 255, 255, 0.03); border: 1px solid rgba(255, 255, 255, 0.05); border-radius: var(--radius-md); color: var(--text-tertiary); text-decoration: none; transition: all var(--transition-fast); position: relative; overflow: hidden; }
.footer-social a::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), transparent); opacity: 0; transition: opacity var(--transition-fast); }
.footer-social a:hover { color: var(--text-primary); background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.15); transform: translateY(-2px) scale(1.05); box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15); }
.footer-social a:hover::before { opacity: 1; }
.footer-social a svg { width: 18px; height: 18px; z-index: 1; position: relative; }
.footer-bottom { margin-top: var(--space-lg); }
.footer-divider { width: 100%; height: 1px; background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent); margin-bottom: var(--space-lg); }
.footer-bottom-content { display: flex; justify-content: space-between; align-items: center; padding: 0 var(--space-sm); }
.footer-bottom-content p { font-size: 0.85rem; color: var(--text-tertiary); margin: 0; font-weight: var(--font-weight-normal); letter-spacing: -0.01em; }
#scroll-to-top { display: inline-flex; align-items: center; justify-content: center; width: 36px; height: 36px; background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: var(--radius-md); color: var(--text-secondary); cursor: pointer; transition: all var(--transition-fast); position: relative; overflow: hidden; }
#scroll-to-top::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), transparent); opacity: 0; transition: opacity var(--transition-fast); }
#scroll-to-top:hover { color: var(--text-primary); background: rgba(255, 255, 255, 0.1); border-color: rgba(255, 255, 255, 0.2); transform: translateY(-2px) scale(1.05); box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2); }
#scroll-to-top:hover::before { opacity: 1; }
#scroll-to-top svg { width: 14px; height: 14px; z-index: 1; position: relative; }
/* Hide scroll-to-top when menu is open */
body.menu-open #scroll-to-top { display: none !important; }
.footer-social a[href*="instagram"]:hover { background: linear-gradient(45deg, #f09433 0%, #e6683c 25%, #dc2743 50%, #cc2366 75%, #bc1888 100%); color: white; border-color: transparent; }
.footer-social a[href*="github"]:hover { background: #333; color: white; border-color: #333; }
.footer-social a[href*="twitter"]:hover { background: #000; color: white; border-color: #333; }
.footer-social a[href*="linkedin"]:hover { background: #0077b5; color: white; border-color: #0077b5; }
.footer-social a[href*="youtube"]:hover { background: #ff0000; color: white; border-color: #ff0000; }
.footer-social a[href*="mailto"]:hover { background: #ea4335; color: white; border-color: #ea4335; }
@media (max-width: 768px) {
  .footer-content { grid-template-columns: 1fr; gap: var(--space-lg); text-align: center; }
  .footer-brand { text-align: center; }
  .footer-links { justify-content: center; flex-wrap: wrap; gap: var(--space-md); }
  .footer-social { justify-content: center; }
  .footer-bottom-content { flex-direction: column; gap: var(--space-md); text-align: center; }
}
@media (max-width: 480px) {
  footer { padding: var(--space-lg) 0 var(--space-md); }
  .footer-container { padding: 0 var(--space-sm); }
  .footer-content { padding: var(--space-md) 0; gap: var(--space-md); }
  .footer-links { flex-direction: column; gap: var(--space-sm); }
  .footer-links a { padding: var(--space-sm) 0; }
  .footer-social { gap: var(--space-xs); }
  .footer-social a { width: 36px; height: 36px; }
  .footer-brand h3 { font-size: 1rem; }
  .footer-brand p { font-size: 0.8rem; }
  .footer-bottom-content p { font-size: 0.8rem; }
}
footer:hover .footer-divider { background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent); }
footer { will-change: auto; contain: layout style paint; }
.footer-social a, #scroll-to-top { will-change: auto; }
.footer-social a:hover, #scroll-to-top:hover { will-change: transform; }
@media (prefers-reduced-motion: reduce) {
  footer, .footer-social a, .footer-links a, #scroll-to-top { transition: none !important; animation: none !important; }
}
@media print {
  footer { background: white !important; border-top: 1px solid #ddd !important; }
  #scroll-to-top { display: none !important; }
  .footer-social a { background: white !important; border: 1px solid #ddd !important; color: #333 !important; }
}