/* ==========================================================================
   MON-BALLONS-77.RU — MAIN STYLESHEET
   Industrial Contrast Design System
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS VARIABLES
   -------------------------------------------------------------------------- */
:root {
  /* Colors — Industrial Contrast Palette */
  --color-bg-primary: #FAFAFA;
  --color-bg-card: #FFFFFF;
  --color-bg-dark: #2B2B2B;
  --color-text-primary: #2B2B2B;
  --color-text-inverse: #FAFAFA;
  --color-accent: #FF5E00;
  --color-accent-hover: #E65500;
  --color-border: #E0E0E0;
  --color-border-dark: #404040;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --font-size-base: 16px;
  --font-size-sm: 14px;
  --font-size-xs: 12px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 48px;

  --line-height-tight: 1.2;
  --line-height-base: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Layout */
  --container-max: 1200px;
  --container-narrow: 800px;
  --border-radius: 2px;
  --border-width: 1px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(43, 43, 43, 0.08);
  --shadow-md: 0 2px 8px rgba(43, 43, 43, 0.12);
  --shadow-lg: 0 4px 16px rgba(43, 43, 43, 0.16);
  --shadow-accent: 0 2px 12px rgba(255, 94, 0, 0.3);

  /* Transitions */
  --transition-fast: 0.15s ease-out;
  --transition-base: 0.2s ease-out;
}

/* --------------------------------------------------------------------------
   RESET & BASE
   -------------------------------------------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   TYPOGRAPHY
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-lg);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--space-md);
}

strong {
  font-weight: 700;
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   CONTAINER & LAYOUT
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container--narrow {
  max-width: var(--container-narrow);
}

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

.section--dark {
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

/* --------------------------------------------------------------------------
   HEADER
   -------------------------------------------------------------------------- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-bg-card);
  border-bottom: var(--border-width) solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md);
  gap: var(--space-lg);
}

.header__logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text-primary);
  white-space: nowrap;
}

.header__logo-accent {
  color: var(--color-accent);
}

.header__nav {
  display: none;
}

.header__nav-list {
  display: flex;
  gap: var(--space-lg);
}

.header__nav-link {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-sm) 0;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast);
}

.header__nav-link:hover,
.header__nav-link--active {
  border-bottom-color: var(--color-accent);
}

.header__cta {
  display: none;
}

.header__menu-toggle {
  width: 32px;
  height: 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: var(--space-xs);
}

.header__menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.header__menu-toggle--active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.header__menu-toggle--active span:nth-child(2) {
  opacity: 0;
}

.header__menu-toggle--active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 61px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-bg-card);
  transform: translateX(100%);
  transition: transform var(--transition-base);
  overflow-y: auto;
  z-index: 99;
}

.mobile-menu--active {
  transform: translateX(0);
}

.mobile-menu__list {
  padding: var(--space-lg) var(--space-md);
}

.mobile-menu__item {
  border-bottom: var(--border-width) solid var(--color-border);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-md) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
  transition: color var(--transition-fast);
}

.mobile-menu__link:hover,
.mobile-menu__link--active {
  color: var(--color-accent);
}

.mobile-menu__cta {
  padding: var(--space-lg) var(--space-md);
}

/* --------------------------------------------------------------------------
   BUTTONS
   -------------------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  font-size: var(--font-size-base);
  font-weight: 700;
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: var(--border-radius);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-md);
}

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  box-shadow: var(--shadow-accent);
  transform: translateY(-1px);
}

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

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

.btn--ghost {
  background-color: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--ghost:hover {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn--block {
  display: block;
  width: 100%;
}

/* --------------------------------------------------------------------------
   CARDS
   -------------------------------------------------------------------------- */
.card {
  background-color: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.card__image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border-bottom: var(--border-width) solid var(--color-border);
}

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

.card__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.card__text {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: #666;
  margin-bottom: var(--space-md);
}

.card__price {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.card__meta {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.card__badge {
  display: inline-block;
  padding: var(--space-xs) var(--space-sm);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--color-bg-primary);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
}

/* --------------------------------------------------------------------------
   GRID SYSTEM
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

/* --------------------------------------------------------------------------
   HERO SECTION
   -------------------------------------------------------------------------- */
.hero {
  padding: var(--space-3xl) 0;
  background: linear-gradient(135deg, var(--color-bg-dark) 0%, #1a1a1a 100%);
  color: var(--color-text-inverse);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 50%;
  height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(255, 94, 0, 0.03) 2px,
    rgba(255, 94, 0, 0.03) 4px
  );
  pointer-events: none;
}

.hero__container {
  position: relative;
  z-index: 1;
}

.hero__content {
  max-width: 600px;
}

.hero__title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-lg);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.hero__text {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-xl);
  opacity: 0.9;
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   FEATURES SECTION
   -------------------------------------------------------------------------- */
.features {
  padding: var(--space-3xl) 0;
}

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

.feature {
  display: flex;
  gap: var(--space-md);
  padding: var(--space-lg);
  background-color: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--border-radius);
}

.feature__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border-radius: var(--border-radius);
}

.feature__icon svg {
  width: 24px;
  height: 24px;
}

.feature__content h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-sm);
}

.feature__content p {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: #666;
  margin: 0;
}

/* --------------------------------------------------------------------------
   FOOTER
   -------------------------------------------------------------------------- */
.footer {
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer__grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-xl);
}

.footer__column h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-accent);
}

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

.footer__link {
  font-size: var(--font-size-sm);
  opacity: 0.8;
  transition: opacity var(--transition-fast), color var(--transition-fast);
}

.footer__link:hover {
  opacity: 1;
  color: var(--color-accent);
}

.footer__contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
}

.footer__contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  opacity: 0.8;
}

.footer__contact-icon {
  width: 16px;
  height: 16px;
  color: var(--color-accent);
}

.footer__bottom {
  padding-top: var(--space-lg);
  border-top: var(--border-width) solid var(--color-border-dark);
  text-align: center;
  font-size: var(--font-size-sm);
  opacity: 0.6;
}

/* --------------------------------------------------------------------------
   CATALOG PAGE
   -------------------------------------------------------------------------- */
.catalog__grid {
  display: grid;
  gap: var(--space-lg);
  grid-template-columns: 1fr;
}

/* --------------------------------------------------------------------------
   SERVICES PAGE
   -------------------------------------------------------------------------- */
.service-card {
  background-color: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
}

.service-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.service-card__icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border-radius: var(--border-radius);
}

.service-card__title {
  font-size: var(--font-size-xl);
  margin: 0;
}

.service-card__list {
  list-style: none;
  margin-bottom: var(--space-lg);
}

.service-card__list li {
  padding: var(--space-sm) 0 var(--space-sm) var(--space-lg);
  border-bottom: var(--border-width) solid var(--color-border);
  position: relative;
}

.service-card__list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 700;
}

/* --------------------------------------------------------------------------
   CONTACTS PAGE
   -------------------------------------------------------------------------- */
.contacts__grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

.contacts__info {
  background-color: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
}

.contacts__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-lg) 0;
  border-bottom: var(--border-width) solid var(--color-border);
}

.contacts__item:last-child {
  border-bottom: none;
}

.contacts__item-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  color: var(--color-accent);
}

.contacts__item-content h3 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #666;
}

.contacts__item-content p {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: 0;
}

/* --------------------------------------------------------------------------
   FORM
   -------------------------------------------------------------------------- */
.form {
  background-color: var(--color-bg-card);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
}

.form__group {
  margin-bottom: var(--space-lg);
}

.form__label {
  display: block;
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form__input,
.form__textarea,
.form__select {
  width: 100%;
  padding: var(--space-md);
  font-size: var(--font-size-base);
  font-family: inherit;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus,
.form__select:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form__textarea {
  resize: vertical;
  min-height: 120px;
}

/* --------------------------------------------------------------------------
   MODAL
   -------------------------------------------------------------------------- */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  background-color: rgba(43, 43, 43, 0.8);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.modal--active {
  opacity: 1;
  pointer-events: auto;
}

.modal__content {
  position: relative;
  width: 100%;
  max-width: 500px;
  background-color: var(--color-bg-card);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  transform: scale(0.9);
  transition: transform var(--transition-base);
}

.modal--active .modal__content {
  transform: scale(1);
}

.modal__header {
  padding: var(--space-lg);
  border-bottom: var(--border-width) solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal__title {
  font-size: var(--font-size-xl);
  margin: 0;
}

.modal__close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #666;
  transition: color var(--transition-fast);
}

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

.modal__body {
  padding: var(--space-xl);
}

/* --------------------------------------------------------------------------
   TOAST NOTIFICATION
   -------------------------------------------------------------------------- */
.toast {
  position: fixed;
  bottom: var(--space-lg);
  right: var(--space-lg);
  z-index: 300;
  max-width: 400px;
  padding: var(--space-md) var(--space-lg);
  background-color: var(--color-bg-dark);
  color: var(--color-text-inverse);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-lg);
  transform: translateX(calc(100% + var(--space-lg)));
  transition: transform var(--transition-base);
}

.toast--active {
  transform: translateX(0);
}

.toast--success {
  border-left-color: #22c55e;
}

.toast--error {
  border-left-color: #ef4444;
}

/* --------------------------------------------------------------------------
   UTILITIES
   -------------------------------------------------------------------------- */
.text-center {
  text-align: center;
}

.text-accent {
  color: var(--color-accent);
}

.mb-0 { margin-bottom: 0; }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.mt-0 { margin-top: 0; }
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

/* --------------------------------------------------------------------------
   RESPONSIVE: TABLET (768px+)
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  :root {
    --font-size-base: 16px;
    --font-size-3xl: 56px;
  }

  .header__menu-toggle {
    display: none;
  }

  .header__nav {
    display: block;
  }

  .header__cta {
    display: block;
  }

  .mobile-menu {
    display: none;
  }

  .grid--2 {
    grid-template-columns: repeat(2, 1fr);
  }

  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .catalog__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .contacts__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --------------------------------------------------------------------------
   RESPONSIVE: DESKTOP (1024px+)
   -------------------------------------------------------------------------- */
@media (min-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .catalog__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .features__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .hero__content {
    max-width: 700px;
  }
}

/* ARTICLE STYLES */
.article-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 16px;
}

.article-content h2 {
  font-size: 28px;
  margin-top: 48px;
  margin-bottom: 24px;
}

.article-content h3 {
  font-size: 22px;
  margin-top: 32px;
  margin-bottom: 16px;
}

.article-content p {
  font-size: 18px;
  line-height: 1.8;
  margin-bottom: 24px;
  color: #333;
}

.article-content ul,
.article-content ol {
  font-size: 18px;
  line-height: 1.8;
  margin-bottom: 24px;
  padding-left: 24px;
  color: #333;
}

.article-content li {
  margin-bottom: 12px;
}

.article-content blockquote {
  margin: 32px 0;
  padding: 24px;
  background-color: #FAFAFA;
  border-left: 4px solid #FF5E00;
  font-size: 18px;
  font-style: italic;
  color: #666;
}

.article-content strong {
  color: #2B2B2B;
}

.article-content a {
  color: #FF5E00;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 94, 0, 0.3);
  transition: all var(--transition-fast);
}

.article-content a:hover {
  background-color: rgba(255, 94, 0, 0.1);
}

.breadcrumbs {
  margin-bottom: 32px;
}

.breadcrumbs ul {
  list-style: none;
  display: flex;
  gap: 8px;
  font-size: 14px;
}

.breadcrumbs a {
  color: #666;
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: #FF5E00;
}

.breadcrumbs span {
  color: #999;
}

.blog-card {
  display: block;
  color: var(--color-text-primary);
}

.blog-card:hover {
  text-decoration: none;
}

.blog-card__meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-lg);
  font-size: var(--font-size-sm);
  color: #666;
}

.block-txt a {
  color: var(--color-accent);
}