/* ==== CSS ПЕРЕМЕННЫЕ И БАЗОВЫЕ СТИЛИ ==== */
:root {
  color-scheme: light dark;
  
  /* Цветовая палитра */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #7e22ce;
  --color-accent: #3b82f6;
  --color-success: #10b981;
  --color-danger: #ef4444;
  --color-warning: #f59e0b;
  
  /* Текст */
  --color-text: #0f172a;
  --color-text-light: #64748b;
  --color-text-inverse: #ffffff;
  
  /* Фоны */
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #1e293b;
  --color-bg-darker: #0f172a;
  
  /* Границы */
  --color-border: #e2e8f0;
  
  /* Тени */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  
  /* Отступы */
  --space-xs: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
  --space-sm: clamp(0.75rem, 0.6rem + 0.75vw, 1rem);
  --space-md: clamp(1rem, 0.8rem + 1vw, 1.5rem);
  --space-lg: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
  --space-xl: clamp(2rem, 1.6rem + 2vw, 3rem);
  --space-2xl: clamp(3rem, 2.4rem + 3vw, 4rem);
  
  /* Радиусы */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  
  /* Типографика */
  --font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --font-size-lg: clamp(1.125rem, 1rem + 0.625vw, 1.5rem);
  --font-size-xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  --font-size-2xl: clamp(2rem, 1.6rem + 2vw, 3rem);
}

/* ==== БАЗОВЫЕ СТИЛИ ==== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==== SKIP LINK ==== */
.skip-link {
  position: absolute;
  inset-inline-start: var(--space-md);
  inset-block-start: -100%;
  z-index: 10000;
  padding: var(--space-sm) var(--space-md);
  background: #111;
  color: #fff;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  transition: inset-block-start 0.2s ease;
}

.skip-link:focus,
.skip-link:focus-visible {
  inset-block-start: var(--space-md);
}

/* ==== FOCUS MANAGEMENT ==== */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

a, button, input, textarea, select {
  outline-offset: 2px;
}

/* Крупные цели на устройствах с touch */
@media (pointer: coarse) {
  a, button, .nav-link {
    min-height: 44px;
    padding: var(--space-sm) var(--space-md);
  }
}

/* ==== УЛУЧШЕННЫЕ АДАПТИВНЫЕ ФОРМЫ ==== */

.contact-form {
    container-type: inline-size;
    container-name: contact-form;
}

.form-grid {
    display: grid;
    gap: var(--space-lg);
    margin-bottom: var(--space-xl);
}

/* Адаптивная сетка для полей формы */
@container contact-form (min-width: 600px) {
    .form-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .form-group--full {
        grid-column: 1 / -1;
    }
}

/* Улучшенные поля ввода */
.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: clamp(var(--space-sm), 2vw, var(--space-md));
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    transition: all 0.3s ease;
    resize: vertical;
    min-height: 44px; /* WCAG минимальная высота цели */
}

.form-textarea {
    min-height: 120px;
    line-height: 1.5;
}

/* Улучшенный фокус */
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    transform: translateY(-1px);
}

/* Валидация в реальном времени */
.form-input:invalid:not(:focus):not(:placeholder-shown),
.form-select:invalid:not(:focus),
.form-textarea:invalid:not(:focus):not(:placeholder-shown) {
    border-color: var(--color-danger);
    background-color: rgba(239, 68, 68, 0.05);
}

.form-input:valid:not(:focus):not(:placeholder-shown),
.form-select:valid:not(:focus),
.form-textarea:valid:not(:focus):not(:placeholder-shown) {
    border-color: var(--color-success);
    background-color: rgba(16, 185, 129, 0.05);
}

/* Группы форм с иконками */
.form-group--with-icon {
    position: relative;
}

.form-icon {
    position: absolute;
    left: var(--space-md);
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--color-text-light);
    pointer-events: none;
}

.form-group--with-icon .form-input {
    padding-left: calc(var(--space-md) + 20px + var(--space-sm));
}

/* Адаптивные кнопки формы */
.form-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    justify-content: flex-end;
}

.form-button {
    flex: 1;
    min-width: min(100%, 200px);
    padding: clamp(var(--space-sm), 2vw, var(--space-lg));
    font-size: var(--font-size-base);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
    text-align: center;
    min-height: 44px;
}

.form-button--primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-text-inverse);
}

.form-button--secondary {
    background: var(--color-bg-alt);
    color: var(--color-text);
    border: 2px solid var(--color-border);
}

/* Сообщения об ошибках */
.form-error {
    color: var(--color-danger);
    font-size: var(--font-size-sm);
    margin-top: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.form-success {
    color: var(--color-success);
    font-size: var(--font-size-sm);
    margin-top: var(--space-xs);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

/* Загрузка формы */
.form-loading {
    opacity: 0.7;
    pointer-events: none;
}

.form-loading::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Адаптивность для мобильных */
@container contact-form (max-width: 600px) {
    .form-actions {
        flex-direction: column;
    }
    
    .form-button {
        min-width: 100%;
    }
}

/* Поддержка темной темы для форм */
[data-theme="dark"] {
    .form-input,
    .form-select,
    .form-textarea {
        background: var(--color-bg-alt);
        border-color: var(--color-border);
        color: var(--color-text);
    }
    
    .form-input::placeholder,
    .form-textarea::placeholder {
        color: var(--color-text-light);
    }
}

/* Улучшенная доступность */
@media (prefers-reduced-motion: reduce) {
    .form-input,
    .form-select,
    .form-textarea,
    .form-button {
        transition: none;
    }
}

/* Печать */
@media print {
    .form-input,
    .form-select,
    .form-textarea {
        border: 1px solid #000;
        background: none;
    }
    
    .form-button {
        display: none;
    }
}

/* ==== PAGE CONTAINER ==== */
.page-container {
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* ==== HEADER ==== */
.header {
  position: sticky;
  top: 0;
  padding-block-start: calc(var(--space-md) + env(safe-area-inset-top));
  padding-block-end: var(--space-md);
  padding-inline-start: calc(var(--space-md) + env(safe-area-inset-left));
  padding-inline-end: calc(var(--space-md) + env(safe-area-inset-right));
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  z-index: 100;
  isolation: isolate;
  box-shadow: var(--shadow-sm);
}

.header-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.5rem;
}

.header-title {
  font-size: var(--font-size-lg);
  margin: 0;
}

.theme-toggle {
  margin-left: auto;
  background: rgba(255, 255, 255, 0.1);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-lg);
  padding: var(--space-xs) var(--space-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: var(--font-size-lg);
  backdrop-filter: blur(10px);
  min-height: 44px;
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
}

/* ==== NAVIGATION ==== */
.nav {
  background: var(--color-bg-darker);
  padding: var(--space-sm) 0;
  position: sticky;
  top: calc(60px + env(safe-area-inset-top));
  z-index: 99;
  box-shadow: var(--shadow-sm);
}

.nav-list {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  overflow-x: auto;
  padding: 0 var(--space-md);
  margin: 0;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-item {
  margin: 0;
  flex-shrink: 0;
}

.nav-link {
  color: var(--color-text-inverse);
  text-decoration: none;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  transition: all 0.3s ease;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border: 2px solid transparent;
  white-space: nowrap;
  display: inline-block;
  text-align: center;
  min-height: 44px;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.nav-link:hover {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, #6a4190 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
  border-color: rgba(255,255,255,0.3);
}

.nav-link--active {
  background: linear-gradient(135deg, var(--color-accent) 0%, #00f2fe 100%);
  box-shadow: 0 6px 20px rgba(79, 172, 254, 0.4);
  border: 2px solid rgba(255,255,255,0.5);
}

/* ==== MAIN CONTENT ==== */
.main {
  flex: 1;
  padding-inline: clamp(var(--space-md), 3vw, var(--space-2xl));
  padding-block: var(--space-xl);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

/* ==== HERO SECTION ==== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text-inverse);
  padding: var(--space-2xl) 0;
  margin: calc(-1 * var(--space-xl)) calc(-50vw + 50%) var(--space-xl);
  padding-inline: calc(50vw - 50%);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-2xl);
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding-inline: clamp(var(--space-md), 3vw, var(--space-2xl));
}

.hero-text {
  max-width: 65ch;
}

.hero-title {
  font-size: clamp(1.75rem, 1.4rem + 1.75vw, 3rem);
  margin-bottom: var(--space-sm);
  font-weight: 700;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  opacity: 0.9;
  margin-bottom: var(--space-md);
  font-weight: 500;
}

.hero-description {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
  opacity: 0.9;
}

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

.hero-photo-container {
  container-type: inline-size;
  container-name: hero-photo;
}

.hero-photo {
  inline-size: clamp(150px, 20cqi, 300px);
  block-size: auto;
  aspect-ratio: 1;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-lg);
}

/* ==== BUTTONS ==== */
.button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-text-inverse);
  border: none;
  padding: max(var(--space-sm), calc((44px - 1em) / 2)) var(--space-lg);
  font-size: var(--font-size-base);
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.3s ease;
  text-decoration: none;
  text-align: center;
  box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
  min-height: 44px;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
}

.button:active {
  transform: translateY(0);
}

.button--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
}

.button--secondary {
  background: var(--color-bg-alt);
  color: var(--color-text);
  border: 2px solid var(--color-border);
}

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

/* ==== SECTIONS ==== */
.section-title {
  font-size: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  color: var(--color-text);
  margin-bottom: var(--space-lg);
  text-align: center;
  font-weight: 600;
}

/* ==== SKILLS SECTION ==== */
.skills-section {
  margin-bottom: var(--space-2xl);
}

.skills-grid {
  display: grid;
  gap: var(--space-md);
  max-width: 600px;
  margin: 0 auto;
}

.skill-item {
  background: var(--color-bg);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.skill-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.skill-name {
  font-weight: 600;
  color: var(--color-text);
  font-size: var(--font-size-base);
}

.skill-percent {
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.skill-bar {
  height: 8px;
  background: var(--color-bg-alt);
  border-radius: 4px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  border-radius: 4px;
  transition: width 1s ease-in-out;
}

/* ==== PROJECTS PREVIEW ==== */
.projects-preview {
  margin-bottom: var(--space-2xl);
}

.projects-area {
  container-type: inline-size;
  container-name: projects;
}

.projects-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

/* Container queries for projects */
@container projects (min-width: 640px) {
  .projects-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@container projects (min-width: 960px) {
  .projects-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.project-card {
  background: var(--color-bg);
  padding: var(--space-lg);
  border-radius: var(--radius-md);
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  border: 1px solid var(--color-border);
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100%;
}

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

.project-image {
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
  color: var(--color-text-inverse);
  font-weight: bold;
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.project-title {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin-bottom: var(--space-xs);
  font-weight: 600;
  overflow-wrap: anywhere;
}

.project-description {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  line-height: 1.5;
  overflow-wrap: anywhere;
  flex: 1;
}

/* ==== FOOTER ==== */
.footer {
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-bg-darker) 100%);
  color: var(--color-text-inverse);
  padding-block: var(--space-lg);
  padding-inline: clamp(var(--space-md), 3vw, var(--space-2xl));
  margin-top: auto;
  padding-bottom: calc(var(--space-lg) + env(safe-area-inset-bottom));
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-copyright {
  margin: 0;
  color: var(--color-text-inverse);
  font-size: var(--font-size-sm);
}

.footer-link {
  color: var(--color-text-inverse);
  text-decoration: none;
  font-size: var(--font-size-sm);
}

.footer-link:hover {
  text-decoration: underline;
}

/* ==== ACCESSIBILITY ENHANCEMENTS ==== */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Enhanced contrast for users who prefer it */
@media (prefers-contrast: more) {
  .button, .nav-link {
    box-shadow: inset 0 0 0 2px #fff;
  }
  
  .skill-bar {
    border: 1px solid var(--color-text);
  }
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .skill-progress {
    transition: none;
  }
  
  .project-card:hover {
    transform: none;
  }
  
  .nav-link:hover {
    transform: none;
  }
  
  .button:hover {
    transform: none;
  }
}

/* ==== DARK THEME ==== */
[data-theme="dark"] {
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-text: #f1f5f9;
  --color-text-light: #94a3b8;
  --color-border: #334155;
}

/* ==== RESPONSIVE DESIGN ==== */
@media (max-width: 768px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-lg);
  }
  
  .hero {
    margin: calc(-1 * var(--space-md)) calc(-50vw + 50%) var(--space-lg);
    padding: var(--space-xl) 0;
  }
  
  .nav-list {
    justify-content: flex-start;
    gap: var(--space-xs);
  }
  
  .nav-link {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-sm);
    min-width: auto;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .header {
    padding-inline: var(--space-sm);
  }
  
  .nav-list {
    padding: 0 var(--space-sm);
  }
  
  .main {
    padding-inline: var(--space-sm);
    padding-block: var(--space-lg);
  }
  
  .hero-title {
    font-size: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
  }
}

/* Scrollbar styling for navigation */
.nav-list::-webkit-scrollbar {
  height: 4px;
}

.nav-list::-webkit-scrollbar-track {
  background: rgba(255,255,255,0.1);
  border-radius: 2px;
}

.nav-list::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.3);
  border-radius: 2px;
}

.nav-list::-webkit-scrollbar-thumb:hover {
  background: rgba(255,255,255,0.5);
}