/**
 * Премиальные стили сайта ООО «СФЕРА-РЕСУРС»
 * Материалы верхнего строения пути (ВСП)
 */

:root {
  --color-primary: #0f172a;
  --color-primary-mid: #1e293b;
  --color-primary-light: #334155;
  --color-accent: #c2410c;
  --color-accent-light: #ea580c;
  --color-gold: #f59e0b;
  --color-gold-light: #fbbf24;
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-bg: #f8fafc;
  --color-bg-subtle: #f1f5f9;
  --color-white: #ffffff;
  --gradient-header: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
  --gradient-nav: linear-gradient(180deg, #1e293b 0%, #334155 100%);
  --gradient-hero: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  --gradient-card: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%);
  --gradient-btn: linear-gradient(135deg, #ea580c 0%, #c2410c 50%, #b45309 100%);
  --gradient-btn-hover: linear-gradient(135deg, #f97316 0%, #ea580c 50%, #d97706 100%);
  --shadow-soft: 0 4px 20px rgba(15, 23, 42, 0.06);
  --shadow-card: 0 8px 30px rgba(15, 23, 42, 0.08);
  --shadow-card-hover: 0 16px 48px rgba(15, 23, 42, 0.12);
  --shadow-btn: 0 4px 14px rgba(234, 88, 12, 0.4);
  --radius: 12px;
  --radius-sm: 8px;
  --font-main: 'PT Sans', 'Segoe UI', system-ui, sans-serif;
}

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

html, body {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  margin: 0;
  padding: 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

/* Шапка — премиальный градиент */
.site-header {
  background: var(--gradient-header);
  color: var(--color-white);
  padding: 0.85rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.15);
  margin: 0;
  margin-bottom: 0 !important;
  display: block;
  vertical-align: top;
  line-height: 1;
  height: auto;
}

.site-header + .nav-main {
  margin-top: -75px !important;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-white);
}

.logo-link:hover {
  color: var(--color-white);
  opacity: 0.92;
}

.logo-img {
  height: 48px;
  width: auto;
  object-fit: contain;
  border-radius: var(--radius-sm);
}

.logo-text {
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.header-contacts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.95rem;
}

.header-contacts a {
  color: rgba(255, 255, 255, 0.95);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: color 0.2s, transform 0.2s;
}

.header-contacts a:hover {
  color: var(--color-gold-light);
}

/* Навигация — фоновое изображение железной дороги */
.nav-main {
  background-image: url('../images/nav-bg.jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  background-attachment: scroll;
  image-rendering: -webkit-optimize-contrast;
  image-rendering: high-quality;
  -ms-interpolation-mode: bicubic;
  padding: 0;
  margin: 0 !important;
  margin-top: 0 !important;
  margin-bottom: 0 !important;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25), 0 -2px 10px rgba(0, 0, 0, 0.1);
  position: relative;
  height: 500px;
  width: 100%;
  max-width: 1920px;
  margin-left: auto !important;
  margin-right: auto !important;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
  border-bottom: 3px solid var(--color-accent);
}

.nav-main > * {
  font-size: 1rem;
  line-height: normal;
}

.nav-main::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to bottom, transparent, rgba(15, 23, 42, 0.4));
  pointer-events: none;
  z-index: 0;
}

.nav-inner {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.5rem;
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  height: 250px;
  box-sizing: border-box;
}

.nav-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  justify-content: center;
  align-items: center;
}

.nav-list a {
  color: rgba(255, 255, 255, 0.98);
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: color 0.2s, background 0.2s, box-shadow 0.2s, transform 0.2s;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.7), 0 0 8px rgba(0, 0, 0, 0.5);
  background: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.nav-list a:hover,
.nav-list a.active {
  color: var(--color-white);
  background: rgba(234, 88, 12, 0.9);
  box-shadow: 0 4px 12px rgba(234, 88, 12, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
  text-shadow: 0 2px 6px rgba(0, 0, 0, 0.8);
  transform: translateY(-2px);
}

/* Кнопка с проблеском */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s, opacity 0.2s;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.35),
    transparent
  );
  transition: left 0.5s ease;
}

.btn:hover::before {
  left: 100%;
}

.btn-primary {
  background: var(--gradient-btn);
  color: var(--color-white);
  box-shadow: var(--shadow-btn), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: var(--gradient-btn-hover);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(234, 88, 12, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-ghost {
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.25);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.35);
}

/* Контент */
main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

.main-catalog {
  padding-top: 0.5rem;
}

/* Блок «Материалы ВСП» в стиле falcon-rail.ru */
.catalog-hero {
  text-align: center;
  margin-bottom: 2.5rem;
  margin-top: 2rem;
  padding: 2.5rem 1.5rem;
  background: var(--gradient-hero);
  border-radius: var(--radius);
  border: 1px solid rgba(30, 41, 59, 0.08);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.catalog-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-gold), var(--color-accent));
}

.catalog-title {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
  letter-spacing: 0.02em;
  line-height: 1.2;
  position: relative;
}

.catalog-title::after {
  content: '🚂';
  display: inline-block;
  margin-left: 0.5rem;
  font-size: 0.85em;
  vertical-align: middle;
  filter: grayscale(0.3);
}

.catalog-desc {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  margin: 0;
  line-height: 1.6;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

/* Фильтр по категориям */
.catalog-block {
  margin-bottom: 1rem;
}

.category-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  justify-content: center;
}

.category-pill {
  padding: 0.5rem 1rem;
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  border: 1px solid rgba(30, 41, 59, 0.15);
  border-radius: 2rem;
  background: var(--color-white);
  color: var(--color-text-muted);
  cursor: pointer;
  transition: color 0.2s, background 0.2s, border-color 0.2s, box-shadow 0.2s;
  position: relative;
  overflow: hidden;
}

.category-pill::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
  transition: left 0.4s ease;
}

.category-pill:hover {
  color: var(--color-primary);
  border-color: var(--color-accent);
  background: rgba(234, 88, 12, 0.06);
}

.category-pill:hover::before {
  left: 100%;
}

.category-pill.is-active {
  background: var(--gradient-btn);
  color: var(--color-white);
  border-color: transparent;
  box-shadow: var(--shadow-btn);
}

.category-pill.is-active:hover {
  background: var(--gradient-btn-hover);
  color: var(--color-white);
}

/* Сетка товаров — как на falcon-rail.ru, компактные карточки в ряд */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  list-style: none;
}

.page-title {
  font-size: 1.85rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--color-accent), var(--color-gold)) 1;
  display: inline-block;
  font-weight: 700;
}

/* Скрытие карточки при фильтрации */
.product-card.is-hidden {
  display: none;
}

.product-card {
  background: var(--gradient-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow 0.3s, transform 0.3s, border-color 0.3s;
  border: 1px solid rgba(30, 41, 59, 0.08);
  cursor: pointer;
  position: relative;
}

.product-card__badge {
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 2;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  background: rgba(15, 23, 42, 0.75);
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.product-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius);
  padding: 1px;
  background: linear-gradient(135deg, rgba(234, 88, 12, 0.15), rgba(245, 158, 11, 0.08));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.3s;
  pointer-events: none;
}

.product-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-4px);
  border-color: rgba(234, 88, 12, 0.2);
}

.product-card:hover::after {
  opacity: 1;
}

.product-card__img {
  height: 130px;
  background: linear-gradient(135deg, #e2e8f0 0%, #cbd5e1 50%, #94a3b8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 2rem;
  font-weight: 300;
  position: relative;
  overflow: hidden;
}

.product-card__img::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    120deg,
    transparent 0%,
    rgba(255, 255, 255, 0.2) 50%,
    transparent 100%
  );
  opacity: 0.6;
}

.product-card__body {
  padding: 0.85rem;
}

.product-card__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
  line-height: 1.3;
}

.product-card__meta {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.product-card__price {
  font-size: 0.9rem;
  font-weight: 600;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Попап заявки */
.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.popup-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.popup {
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: 0 24px 64px rgba(15, 23, 42, 0.2);
  max-width: 420px;
  width: 100%;
  padding: 2rem;
  position: relative;
  transform: scale(0.95) translateY(10px);
  transition: transform 0.3s ease;
  border: 1px solid rgba(30, 41, 59, 0.08);
}

.popup-overlay.is-open .popup {
  transform: scale(1) translateY(0);
}

.popup-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 36px;
  height: 36px;
  border: none;
  background: var(--color-bg-subtle);
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--color-text-muted);
  transition: background 0.2s, color 0.2s;
}

.popup-close:hover {
  background: var(--color-primary-light);
  color: var(--color-white);
}

.popup h3 {
  font-size: 1.35rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  font-weight: 600;
}

.popup-product {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
  padding: 0.5rem 0.75rem;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-accent);
}

.form-group {
  margin-bottom: 1.1rem;
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.form-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-main);
  font-size: 1rem;
  border: 1px solid rgba(30, 41, 59, 0.2);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(234, 88, 12, 0.15);
}

.popup .btn {
  width: 100%;
  padding: 0.85rem 1.5rem;
  margin-top: 0.5rem;
}

.popup-message {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  display: none;
}

.popup-message.success {
  display: block;
  background: #dcfce7;
  color: #166534;
  border: 1px solid #86efac;
}

.popup-message.error {
  display: block;
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fca5a5;
}

/* Страницы «О компании» и «Контакты» */
.content-block {
  background: var(--gradient-card);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid rgba(30, 41, 59, 0.06);
}

.content-block p {
  margin-bottom: 1rem;
}

.content-block p:last-child {
  margin-bottom: 0;
}

.content-block__subtitle {
  margin-bottom: 1rem;
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 600;
}

.content-block__legal-link {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(30, 41, 59, 0.08);
  font-size: 0.95rem;
}

.content-block__legal-link a {
  font-weight: 600;
}

.content-block--legal .content-block__lead {
  margin-bottom: 1.5rem;
  font-size: 1.05rem;
  color: var(--color-text-muted);
}

.content-block--legal h2 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-size: 1.1rem;
  color: var(--color-primary);
  font-weight: 600;
}

.content-block--legal h2:first-of-type {
  margin-top: 0;
}

.content-block--legal .content-block__meta {
  margin-top: 1.5rem;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.footer-inner a {
  margin-left: 0.35em;
  white-space: nowrap;
}

.contacts-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 1rem;
}

.contact-row {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 0.75rem;
  align-items: start;
}

.contact-row dt {
  font-weight: 600;
  color: var(--color-primary);
  font-size: 0.9rem;
}

.contact-row dd {
  margin: 0;
  font-size: 0.95rem;
}

.contact-row a {
  word-break: break-all;
}

@media (max-width: 640px) {
  .contact-row {
    grid-template-columns: 1fr;
  }
}

/* Подвал — градиент */
.site-footer {
  background: var(--gradient-header);
  color: rgba(255, 255, 255, 0.88);
  padding: 1.5rem 1.5rem;
  margin-top: auto;
  font-size: 0.9rem;
  box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.08);
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.site-footer a {
  color: rgba(255, 255, 255, 0.92);
}

.site-footer a:hover {
  color: var(--color-gold-light);
}

.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }

@media (max-width: 768px) {
  .nav-main {
    background-attachment: scroll;
    height: 300px;
  }
  
  .catalog-hero {
    margin-top: 1rem;
    padding: 1.75rem 1rem;
  }
  
  .catalog-title {
    font-size: 1.5rem;
  }
  
  .catalog-desc {
    font-size: 1rem;
  }
}

@media (max-width: 640px) {
  .logo-text { font-size: 1.1rem; }
  .logo-img { height: 40px; }
  .catalog-title { font-size: 1.4rem; }
  .catalog-title::after { font-size: 0.75em; margin-left: 0.3rem; }
  .category-filters { justify-content: flex-start; overflow-x: auto; padding-bottom: 0.25rem; -webkit-overflow-scrolling: touch; }
  .category-pill { flex-shrink: 0; }
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }
  .product-card__img { height: 100px; font-size: 1.5rem; }
  .product-card__body { padding: 0.6rem; }
  .product-card__title { font-size: 0.8rem; }
  .product-card__badge { font-size: 0.6rem; padding: 0.15rem 0.35rem; }
  .nav-list a {
    padding: 0.5rem 0.9rem;
    font-size: 0.9rem;
  }
}

@media (min-width: 900px) {
  .catalog-block .products-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (min-width: 1100px) {
  .catalog-block .products-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}