/* ========================================
   Oğuzhan Tutucu - Personal Website
   Monochrome + Blue Accent | Glassmorphism
   ======================================== */

/* CSS Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* CSS Custom Properties - Dark Mode (Default) */
:root {
  /* Dark Mode - Monochrome */
  --bg-primary: #0a0a0a;
  --bg-secondary: rgba(24, 24, 27, 0.8);
  --bg-tertiary: rgba(39, 39, 42, 0.6);
  --bg-glass: rgba(255, 255, 255, 0.05);
  --border: rgba(255, 255, 255, 0.1);
  --border-hover: rgba(255, 255, 255, 0.2);

  /* Text */
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;

  /* Accent - Blue */
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.4);

  /* Blur */
  --blur-amount: 20px;
  --blur-heavy: 40px;

  /* Social Brand Colors */
  --github: #fafbfc;
  --linkedin: #0a66c2;
  --twitter: #1DA1F2;
  --medium: #ffffff;
  --hackerrank: #02bd53;
  --googledev: #4285F4;
  --zibidisoft: #c323b8;
  --email: #ea4335;

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

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Container */
  --container-max: 900px;
  --container-padding: var(--space-lg);
}

/* Light Mode */
[data-theme="light"] {
  --bg-primary: #fafafa;
  --bg-secondary: rgba(229, 229, 229, 0.8);
  --bg-tertiary: rgba(244, 244, 245, 0.8);
  --bg-glass: rgba(0, 0, 0, 0.02);
  --border: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);

  --text-primary: #18181b;
  --text-secondary: #52525b;
  --text-muted: #a1a1aa;

  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.3);

  --github: #2b3137;
  --medium: #18181b;
}

/* Base Styles */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ========================================
   Header & Navigation
   ======================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  backdrop-filter: blur(var(--blur-heavy));
  -webkit-backdrop-filter: blur(var(--blur-heavy));
  border-bottom: 1px solid var(--border);
  transition: all var(--transition-base);
}

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

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

.logo-text {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-xs);
}

.nav-links a {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.nav-links a.active {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

/* Nav Controls - Theme & Language */
.nav-controls {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 4px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  border: 1px solid var(--border);
}

.nav-control-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background: transparent;
  border: none;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

.nav-control-btn:hover {
  color: var(--text-primary);
  background: var(--bg-glass);
}

.nav-control-btn.active,
.nav-control-btn:focus {
  color: var(--text-primary);
  background: var(--bg-secondary);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.lang-btn {
  width: auto;
  padding: 0 var(--space-md);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Mobile Navigation */
.nav-toggle {
  display: none;
}

.nav-toggle-label {
  display: none;
  cursor: pointer;
  padding: var(--space-sm);
  border-radius: var(--radius-sm);
}

.nav-toggle-label:hover {
  background: var(--bg-glass);
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  position: relative;
  transition: var(--transition-base);
  border-radius: 1px;
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
  content: '';
  position: absolute;
}

.nav-toggle-label span::before {
  top: -6px;
}

.nav-toggle-label span::after {
  top: 6px;
}

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

  .nav-right {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    backdrop-filter: blur(var(--blur-heavy));
    -webkit-backdrop-filter: blur(var(--blur-heavy));
    flex-direction: column;
    gap: var(--space-md);
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base), padding var(--transition-base);
    border-bottom: 1px solid var(--border);
  }

  .nav-toggle:checked~.nav-right {
    max-height: 400px;
    padding: var(--space-lg);
  }

  .nav-links {
    flex-direction: column;
    width: 100%;
  }

  .nav-links a {
    display: block;
    padding: var(--space-md);
    text-align: center;
  }

  .nav-controls {
    width: 100%;
    justify-content: center;
  }

  .nav-toggle:checked~.nav-toggle-label span {
    background: transparent;
  }

  .nav-toggle:checked~.nav-toggle-label span::before {
    top: 0;
    transform: rotate(45deg);
  }

  .nav-toggle:checked~.nav-toggle-label span::after {
    top: 0;
    transform: rotate(-45deg);
  }
}

/* ========================================
   Main Content
   ======================================== */
.main-content {
  flex: 1;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--space-2xl) var(--container-padding);
  width: 100%;
}

/* ========================================
   Bento Grid
   ======================================== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: 1fr;
  gap: var(--space-md);
}

.bento-card {
  background: var(--bg-secondary);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.bento-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-glow) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.bento-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.bento-card:hover::before {
  opacity: 0.7;
}

/* Card Sizes */
.bento-card.large {
  grid-column: span 2;
  grid-row: span 2;
}

.bento-card.wide {
  grid-column: span 2;
}

/* Profile Card */
.profile-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-md);
}

.profile-image-wrapper {
  width: 120px;
  height: 120px;
  border-radius: 50%;
}

.profile-image-wrapper img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.profile-name {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.profile-bio {
  color: var(--text-secondary);
  font-size: var(--font-size-base);
  line-height: 1.6;
}

/* Social Cards */
.social-card {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  cursor: pointer;
}

.social-card svg {
  width: 28px;
  height: 28px;
  transition: transform var(--transition-base);
}

.social-card:hover svg {
  transform: scale(1.15);
}

.social-card.github {
  color: var(--github);
}

.social-card.github::before {
  background: linear-gradient(135deg, rgba(250, 251, 252, 0.15) 0%, transparent 50%);
}

[data-theme="light"] .social-card.github::before {
  background: linear-gradient(135deg, rgba(43, 49, 55, 0.15) 0%, transparent 50%);
}

.social-card.linkedin {
  color: var(--linkedin);
}

.social-card.linkedin::before {
  background: linear-gradient(135deg, rgba(10, 102, 194, 0.4) 0%, transparent 50%);
}

.social-card.twitter {
  color: var(--twitter);
}

.social-card.twitter::before {
  background: linear-gradient(135deg, rgba(29, 161, 242, 0.4) 0%, transparent 50%);
}

.social-card.medium {
  color: var(--medium);
}

.social-card.medium::before {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, transparent 50%);
}

[data-theme="light"] .social-card.medium::before {
  background: linear-gradient(135deg, rgba(24, 24, 27, 0.15) 0%, transparent 50%);
}

.social-card.hackerrank {
  color: var(--hackerrank);
}

.social-card.hackerrank::before {
  background: linear-gradient(135deg, rgba(2, 189, 83, 0.4) 0%, transparent 50%);
}

.social-card.googledev {
  color: var(--googledev);
}

.social-card.googledev::before {
  background: linear-gradient(135deg, rgba(66, 133, 244, 0.4) 0%, transparent 50%);
}

.social-card.zibidisoft {
  color: var(--zibidisoft);
}

.social-card.zibidisoft::before {
  background: linear-gradient(135deg, rgba(195, 35, 184, 0.4) 0%, transparent 50%);
}

.social-card.email {
  color: var(--email);
}

.social-card.email::before {
  background: linear-gradient(135deg, rgba(234, 67, 53, 0.4) 0%, transparent 50%);
}

.social-card-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  position: relative;
  z-index: 1;
}

.social-card-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  opacity: 0.9;
}

/* Responsive Bento Grid */
@media (max-width: 768px) {
  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: auto;
  }

  .bento-card.large {
    grid-column: span 2;
    grid-row: span 1;
  }
}

@media (max-width: 480px) {
  .bento-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .bento-card.large,
  .bento-card.wide {
    grid-column: span 1;
  }

  .profile-image-wrapper {
    width: 100px;
    height: 100px;
  }

  .profile-name {
    font-size: var(--font-size-xl);
  }
}

/* ========================================
   CV Page
   ======================================== */

.cv-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.cv-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.cv-subtitle {
  color: var(--text-secondary);
  font-size: var(--font-size-lg);
}

.cv-section {
  margin-bottom: var(--space-2xl);
}

.cv-section-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--accent);
  display: inline-block;
  color: var(--text-primary);
}

.cv-item {
  background: var(--bg-secondary);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  transition: border-color var(--transition-base);
}

.cv-item:hover {
  border-color: var(--border-hover);
}

.cv-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-sm);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.cv-item-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.cv-item-date {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

.cv-item-subtitle {
  color: var(--accent);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-md);
}

.cv-item-subtitle a {
  color: var(--accent);
}

.cv-item-description {
  color: var(--text-secondary);
  line-height: 1.7;
}

.cv-skills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.cv-skill-tag {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: 1px solid var(--border);
}

.cv-skill-tag:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  background: var(--bg-secondary);
  backdrop-filter: blur(var(--blur-amount));
  -webkit-backdrop-filter: blur(var(--blur-amount));
  border-top: 1px solid var(--border);
  padding: var(--space-xl) var(--container-padding);
  margin-top: auto;
  transition: background-color var(--transition-base);
}

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

.footer-social {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  transition: all var(--transition-base);
}

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

.social-link:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
}

.social-link.github:hover {
  background: var(--github);
  color: var(--bg-primary);
}

.social-link.linkedin:hover {
  background: var(--linkedin);
  color: white;
}

.social-link.twitter:hover {
  background: var(--twitter);
  color: var(--bg-primary);
}

.social-link.medium:hover {
  background: var(--medium);
  color: var(--bg-primary);
}

.social-link.hackerrank:hover {
  background: var(--hackerrank);
  color: var(--bg-primary);
}

.social-link.googledev:hover {
  background: var(--googledev);
  color: white;
}

.social-link.zibidisoft:hover {
  background: var(--zibidisoft);
  color: white;
}

.social-link.email:hover {
  background: var(--email);
  color: white;
}

/* Hide footer on home page */
.home-page .site-footer {
  display: none;
}

/* ========================================
   Utility Classes
   ======================================== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ========================================
   Print Styles
   ======================================== */
@media print {

  .site-header,
  .site-footer {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .cv-item {
    background: white;
    border: 1px solid #ddd;
  }
}