/* CSS-переменные для светлой и тёмной темы */
:root,
[data-theme="light"] {
  --background: #f8f9fa;
  --background-elevated: #ffffff;
  --foreground: #1a1a1a;
  --foreground-muted: #666666;
  --border: #e5e5e5;
  --button-bg: #1a1a1a;
  --button-fg: #ffffff;
  --card-shadow: rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] {
  --background: #121212;
  --background-elevated: #1e1e1e;
  --foreground: #e8e8e8;
  --foreground-muted: #a0a0a0;
  --border: #2a2a2a;
  --button-bg: #e8e8e8;
  --button-fg: #121212;
  --card-shadow: rgba(0, 0, 0, 0.3);
}

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

body {
  background: var(--background);
  color: var(--foreground);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a { color: inherit; text-decoration: none; }

button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  line-height: 1.6;
  color: var(--foreground-muted);
}

/* Theme transition */
* {
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--background);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(4px);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 64px;
}

.logo {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.theme-toggle {
  padding: 8px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--background-elevated);
  transition: background-color 0.2s;
}

.theme-toggle:hover { background: var(--border); }

.sun-icon { display: none; }
.moon-icon { display: block; }

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

/* Hero */
.hero {
  padding: 80px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}

.hero-content h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
  margin-bottom: 24px;
}

.position {
  font-size: 1.25rem;
  color: var(--foreground-muted);
  font-weight: 500;
  margin-bottom: 32px;
}

.tagline {
  font-size: 1.125rem;
  color: var(--foreground-muted);
  margin-bottom: 40px;
  max-width: 640px;
  line-height: 1.625;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.btn {
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 500;
  transition: opacity 0.2s, background-color 0.2s;
}

.btn-primary {
  background: var(--button-bg);
  color: var(--button-fg);
}

.btn-primary:hover { opacity: 0.9; }

.btn-secondary {
  border: 1px solid var(--border);
}

.btn-secondary:hover { background: var(--border); }

/* Hero Image */
.hero-image {
  display: flex;
  justify-content: center;
}

.image-frame {
  position: relative;
  width: 256px;
  height: 256px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid var(--border);
  box-shadow: 0 25px 50px -12px var(--card-shadow);
}

.profile-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-decoration {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom right, rgba(96, 165, 250, 0.2), rgba(192, 132, 252, 0.2));
  border-radius: 50%;
  filter: blur(40px);
  transform: translate(16px, -16px);
  z-index: -1;
}

.corner {
  position: absolute;
  width: 24px;
  height: 24px;
  border-radius: 8px;
}

.corner-tl {
  top: -8px;
  left: -8px;
  border-top: 2px solid #3b82f6;
  border-left: 2px solid #3b82f6;
}

.corner-tr {
  top: -8px;
  right: -8px;
  border-top: 2px solid #a855f7;
  border-right: 2px solid #a855f7;
}

.corner-bl {
  bottom: -8px;
  left: -8px;
  border-bottom: 2px solid #a855f7;
  border-left: 2px solid #a855f7;
}

.corner-br {
  bottom: -8px;
  right: -8px;
  border-bottom: 2px solid #3b82f6;
  border-right: 2px solid #3b82f6;
}

/* Sections */
.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 40px;
}

.cases, .about, .experience, .additional {
  padding: 64px 0;
}

/* Cases Grid */
.cases-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.case-card {
  transition: transform 0.2s;
}

.case-link {
  display: block;
}

.case-image-wrapper {
  border-radius: 8px;
  overflow: hidden;
  background: var(--background-elevated);
  margin-bottom: 16px;
}

.case-image {
  width: 100%;
  aspect-ratio: 3/2;
  object-fit: cover;
  transition: transform 0.3s;
}

.case-card:hover .case-image {
  transform: scale(1.02);
}

.case-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.case-card:hover .case-title {
  text-decoration: underline;
}

.case-description {
  font-size: 0.875rem;
  color: var(--foreground-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.case-more {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* About */
.about-content p {
  font-size: 1rem;
  color: var(--foreground-muted);
  margin-bottom: 24px;
  line-height: 1.625;
}

/* Experience */
.experience-item {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}

.experience-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.experience-position {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 4px;
}

.experience-company {
  font-size: 1rem;
  color: var(--foreground-muted);
}

.experience-description {
  font-size: 0.875rem;
  color: var(--foreground-muted);
  margin-top: 12px;
}

.experience-period {
  font-size: 0.875rem;
  color: var(--foreground-muted);
  white-space: nowrap;
}

/* Additional Info */
.additional-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.additional-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.additional-item {
  margin-bottom: 24px;
}

.additional-item-title {
  font-size: 1rem;
  font-weight: 500;
}

.additional-item-subtitle {
  font-size: 0.875rem;
  color: var(--foreground-muted);
  margin-top: 4px;
}

.additional-item-period {
  font-size: 0.875rem;
  color: var(--foreground-muted);
}

.hobbies-list {
  list-style: none;
}

.hobbies-list li {
  font-size: 0.875rem;
  color: var(--foreground-muted);
  margin-bottom: 8px;
}

/* Footer */
.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer-title {
  font-weight: 500;
  margin-bottom: 8px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--foreground-muted);
}

.footer-link:hover {
  color: var(--foreground);
}

.footer-copyright {
  font-size: 0.875rem;
  color: var(--foreground-muted);
}

/* Responsive */
@media (min-width: 768px) {
  .hero {
    padding: 128px 0;
  }
  
  .hero-content h1 {
    font-size: 3rem;
  }
  
  .position {
    font-size: 1.5rem;
  }
  
  .tagline {
    font-size: 1.25rem;
  }
  
  .hero-grid {
    grid-template-columns: 1fr 1fr;
  }
  
  .hero-content {
    order: 2;
  }
  
  .hero-image {
    order: 1;
    justify-content: flex-end;
  }
  
  .image-frame {
    width: 320px;
    height: 320px;
  }
  
  .cases-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .experience-item {
    flex-direction: row;
    align-items: baseline;
  }
  
  .experience-period {
    text-align: right;
  }
  
  .additional-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .footer-content {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .hero-content h1 {
    font-size: 3.75rem;
  }
  
  .cases-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .image-frame {
    width: 384px;
    height: 384px;
  }
}