/* AI Portfolio - Инженерный минимализм */

/* ============================================
   CSS Custom Properties (Переменные)
   ============================================ */
:root {
  /* Цвета */
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-text: #1f2937;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-border: #e5e7eb;
  --color-accent: #10b981;

  /* Типографика */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', Menlo, Consolas, monospace;

  /* Размеры */
  --max-width: 1200px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Анимации */
  --transition: 0.2s ease;
}

/* ============================================
   Базовые стили
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ============================================
   Типографика
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-sm);
}

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

a:hover {
  color: var(--color-primary-dark);
}

code {
  font-family: var(--font-mono);
  background-color: var(--color-bg-secondary);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  font-size: 0.9em;
}

/* ============================================
   Контейнер
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* ============================================
   Шапка (Header)
   ============================================ */
.header {
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header__content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.header__logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.header__logo:hover {
  color: var(--color-primary);
}

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

.nav__link {
  color: var(--color-text-light);
  font-weight: 500;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: 0.25rem;
  transition: color var(--transition), background-color var(--transition);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
  background-color: var(--color-bg-secondary);
}

/* Мобильное меню */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
}

.menu-toggle__icon {
  width: 24px;
  height: 24px;
  stroke: var(--color-text);
}

/* ============================================
   Hero-секция
   ============================================ */
.hero {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-bg-secondary);
}

.hero__content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.hero__title {
  font-size: 3rem;
  margin-bottom: var(--spacing-xs);
}

.hero__subtitle {
  font-size: 1.25rem;
  color: var(--color-text-light);
  max-width: 600px;
}

.hero__cta {
  display: inline-flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-sm);
}

/* ============================================
   Кнопки
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 500;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  border: 2px solid transparent;
}

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

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

.btn--secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

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

/* ============================================
   Секции
   ============================================ */
.section {
  padding: var(--spacing-xl) 0;
}

.section--alt {
  background-color: var(--color-bg-secondary);
}

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.section__title {
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.section__subtitle {
  color: var(--color-text-light);
  font-size: 1.1rem;
}

/* ============================================
   Карточки кейсов
   ============================================ */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
}

.case-card {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  overflow: hidden;
  transition: box-shadow var(--transition), transform var(--transition);
}

.case-card:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.case-card__image {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background-color: var(--color-bg-secondary);
}

.case-card__content {
  padding: var(--spacing-md);
}

.case-card__title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
}

.case-card__title a {
  color: var(--color-text);
}

.case-card__title a:hover {
  color: var(--color-primary);
}

.case-card__excerpt {
  color: var(--color-text-light);
  font-size: 0.95rem;
  margin-bottom: var(--spacing-sm);
}

.case-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-sm);
}

.case-card__tag {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-light);
  padding: 0.25rem 0.625rem;
  border-radius: 1rem;
  font-size: 0.8rem;
}

.case-card__links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* ============================================
   Страница кейса
   ============================================ */
.case-detail {
  padding-top: var(--spacing-lg);
}

.case-detail__header {
  margin-bottom: var(--spacing-lg);
}

.case-detail__title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

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

.case-detail__tag {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  padding: 0.375rem 0.875rem;
  border-radius: 1rem;
  font-size: 0.9rem;
}

.case-detail__section {
  margin-bottom: var(--spacing-lg);
}

.case-detail__section-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.case-detail__section-content {
  color: var(--color-text);
  line-height: 1.7;
}

.case-detail__links {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

/* ============================================
   Услуги
   ============================================ */
.services-list {
  display: grid;
  gap: var(--spacing-md);
}

.service-item {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: var(--spacing-md);
  transition: box-shadow var(--transition);
}

.service-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.service-item__title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.service-item__icon {
  width: 24px;
  height: 24px;
  stroke: var(--color-primary);
}

.service-item__description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

.service-item__benefits {
  list-style: none;
  padding-left: 0;
}

.service-item__benefit {
  position: relative;
  padding-left: var(--spacing-md);
  margin-bottom: var(--spacing-xs);
}

.service-item__benefit::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

/* ============================================
   Контакты
   ============================================ */
.contacts {
  max-width: 600px;
  margin: 0 auto;
}

.contacts__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-md);
  background-color: var(--color-bg-secondary);
  border-radius: 0.75rem;
}

.contacts__icon {
  width: 32px;
  height: 32px;
  stroke: var(--color-primary);
  flex-shrink: 0;
}

.contacts__label {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xs);
}

.contacts__value {
  font-size: 1.1rem;
  font-weight: 500;
}

.contacts__value a {
  color: var(--color-text);
}

.contacts__value a:hover {
  color: var(--color-primary);
}

/* ============================================
   Футер
   ============================================ */
.footer {
  background-color: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  margin-top: auto;
}

.footer__content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.footer__copyright {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.footer__links {
  display: flex;
  gap: var(--spacing-md);
}

.footer__link {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.footer__link:hover {
  color: var(--color-primary);
}

/* ============================================
   Адаптивность
   ============================================ */

/* Планшет */
@media (max-width: 1199px) {
  :root {
    --spacing-xl: 2rem;
  }

  .hero__title {
    font-size: 2.5rem;
  }
}

/* Мобильные устройства */
@media (max-width: 767px) {
  :root {
    --spacing-lg: 1.5rem;
    --spacing-xl: 1.5rem;
  }

  .header__content {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

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

  .hero__title {
    font-size: 2rem;
  }

  .hero__subtitle {
    font-size: 1rem;
  }

  .cases-grid {
    grid-template-columns: 1fr;
  }

  .case-detail__title {
    font-size: 2rem;
  }

  .footer__content {
    text-align: center;
  }

  .footer__links {
    justify-content: center;
  }
}

/* Маленькие мобильные устройства */
@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }

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

  .nav__link {
    font-size: 0.9rem;
    padding: var(--spacing-xs);
  }
}

/* ============================================
   Утилиты
   ============================================ */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--color-text-light);
}

.mb-0 {
  margin-bottom: 0;
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

/* Placeholder для изображений */
.img-placeholder {
  background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-border) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 0.9rem;
}