/* ============================================
   HELAMIN — Main Styles
   Mobile-first, CSS custom properties
   ============================================ */

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

:root {
  --c-primary: #0055a4;
  --c-primary-dark: #003d75;
  --c-primary-light: #e6f0fa;
  --c-accent: #e87722;
  --c-text: #1a1a2e;
  --c-text-muted: #5a5a72;
  --c-bg: #ffffff;
  --c-bg-light: #f5f7fa;
  --c-bg-dark: #1a1a2e;
  --c-border: #e0e0e0;

  --font: 'Roboto', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-size-base: 16px;
  --line-height: 1.6;

  --container-max: 1200px;
  --radius: 8px;
  --radius-sm: 4px;
  --transition: 0.25s ease;
}

html { scroll-behavior: smooth; font-size: var(--font-size-base); }

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

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1rem;
}

/* --- Logo helpers --- */
.logo-text { font-weight: 800; color: var(--c-primary); }
.logo-accent { font-weight: 800; color: var(--c-accent); }

/* ============================================
   HERO — full-width with nav + 3-col grid
   ============================================ */
.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
  padding: 0 0 3.5rem;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    #003d75 0%,
    var(--c-primary) 30%,
    #0077b6 60%,
    #003d75 100%
  );
  background-size: 400% 400%;
  animation: heroGradient 16s ease infinite;
  z-index: 0;
}

/* Затемнение снизу для глубины */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, transparent 40%, rgba(0,0,0,0.35) 100%),
    radial-gradient(ellipse at 20% 80%, rgba(255,255,255,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 70% 30%, rgba(255,255,255,0.06) 0%, transparent 40%),
    radial-gradient(ellipse at 50% 90%, rgba(232,119,34,0.08) 0%, transparent 45%);
  z-index: 0;
  pointer-events: none;
}

@keyframes heroGradient {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero > * {
  position: relative;
  z-index: 1;
}

/* ============================================
   MAIN NAV — однотонный синий
   ============================================ */
.main-nav {
  background: var(--c-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: transform 0.3s ease;
}

/* Nav auto-hide on scroll down */
.main-nav--hidden {
  transform: translateY(-100%);
}

.main-nav__inner {
  display: flex;
  align-items: center;
  min-height: 48px;
  gap: 1rem;
}

/* --- Burger (мобильный) --- */
.main-nav__burger {
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  margin-left: -6px;
  z-index: 110;
  flex-shrink: 0;
}

.main-nav__burger span {
  display: block;
  width: 22px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: var(--transition);
  transform-origin: center;
}

.main-nav__burger.active span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.main-nav__burger.active span:nth-child(2) { opacity: 0; }
.main-nav__burger.active span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* --- Nav list (мобильный: скрыт) --- */
.main-nav__list {
  list-style: none;
  display: none;
  flex-direction: column;
  position: fixed;
  top: 48px;
  left: 0;
  width: 100%;
  max-height: calc(100vh - 48px);
  background: var(--c-primary);
  padding: 0.5rem 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.main-nav__list.open {
  display: flex;
}

.main-nav__link {
  display: block;
  padding: 0.875rem 1.25rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: rgba(255,255,255,0.8);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  border-left: 3px solid transparent;
  transition: var(--transition);
}

.main-nav__link:hover {
  color: #fff;
  border-left-color: #fff;
  background: rgba(255,255,255,0.08);
}

.main-nav__link--active {
  color: #fff;
  border-left-color: #fff;
  background: rgba(255,255,255,0.1);
}

/* --- Desktop (≥900px) --- */
@media (min-width: 900px) {
  .main-nav__burger {
    display: none;
  }

  .main-nav__inner {
    justify-content: center;
  }

  .main-nav__list {
    display: flex !important;
    flex-direction: row;
    position: static;
    width: auto;
    max-height: none;
    padding: 0;
    overflow: visible;
    box-shadow: none;
    flex-wrap: wrap;
    justify-content: center;
  }

  .main-nav__link {
    height: 48px;
    display: flex;
    align-items: center;
    padding: 0 0.875rem;
    border-left: none;
    border-bottom: 3px solid transparent;
  }

  .main-nav__link:hover {
    border-bottom-color: #fff;
    background: rgba(255,255,255,0.08);
  }

  .main-nav__link--active {
    border-bottom-color: #fff;
    background: rgba(255,255,255,0.1);
  }
}

/* --- Hero content — 3 колонки --- */
.hero__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-top: 2.5rem;
}

@media (min-width: 900px) {
  .hero__content {
    grid-template-columns: 200px 1fr 200px;
    gap: 2.5rem;
    padding-top: 3.5rem;
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .hero__content {
    grid-template-columns: 240px 1fr 240px;
    gap: 3rem;
  }
}

/* Left col — logo */
.hero__left {
  display: flex;
  justify-content: center;
}

.hero__logo-block {
  text-align: center;
}

.hero__logo-main {
  font-size: clamp(2rem, 6vw, 3rem);
  font-weight: 800;
  color: #fff;
  letter-spacing: 0.06em;
  line-height: 1;
}

.hero__logo-sub {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.55);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 0.375rem;
  line-height: 1.4;
}

@media (min-width: 900px) {
  .hero__left {
    justify-content: flex-start;
    padding-top: 0.5rem;
  }
  .hero__logo-block { text-align: left; }
}

/* Center — главный акцент */
.hero__center {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.hero__title {
  font-size: clamp(2.25rem, 7vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.05;
}

.hero__subtitle {
  font-size: clamp(1rem, 2.5vw, 1.125rem);
  line-height: 1.5;
  opacity: 0.9;
  max-width: 500px;
}

.hero__subtitle-en {
  font-size: 0.875rem;
  font-style: italic;
  opacity: 0.6;
  margin-top: -0.5rem;
}

.hero__badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.hero__badges span {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 50px;
  padding: 0.35rem 1rem;
  color: rgba(255,255,255,0.85);
}

.hero__cta {
  display: inline-block;
  background: var(--c-accent);
  color: #fff;
  padding: 1rem 2.5rem;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.02em;
  transition: var(--transition);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.hero__cta:hover {
  background: #c96218;
  transform: translateY(-1px);
  box-shadow: 0 6px 24px rgba(0,0,0,0.25);
}

/* Right col — контакты (менее шумные) */
.hero__right {
  display: flex;
  justify-content: center;
}

.hero__contacts {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.hero__contacts a {
  font-size: 0.8125rem;
  color: rgba(255,255,255,0.55);
  transition: var(--transition);
}

.hero__contacts a:hover {
  color: #fff;
}

@media (min-width: 900px) {
  .hero__right {
    justify-content: flex-end;
    padding-top: 0.5rem;
  }
  .hero__contacts {
    text-align: right;
  }
}

/* --- Misc --- */
.hero__reg {
  font-size: 0.45em;
  vertical-align: super;
  opacity: 0.6;
  margin-left: 0.1em;
}

/* ============================================
   CONTACT BANNER
   ============================================ */
.contact-banner {
  background: var(--c-primary-light);
  padding: 2.5rem 0;
  text-align: center;
}

.contact-banner__title {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--c-text);
}

.contact-banner__text {
  color: var(--c-text-muted);
  margin-bottom: 1.25rem;
  font-size: 0.9375rem;
}

.contact-banner__btn {
  display: inline-block;
  background: var(--c-primary);
  color: #fff;
  padding: 0.75rem 2rem;
  border-radius: var(--radius);
  font-weight: 600;
  transition: var(--transition);
}

.contact-banner__btn:hover {
  background: var(--c-primary-dark);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--c-bg-dark);
  color: rgba(255,255,255,0.8);
  padding: 2rem 0;
  margin-top: auto;
}

.footer__inner {
  display: grid;
  gap: 1.5rem;
}

.footer__brand .logo-text,
.footer__brand .logo-accent { font-size: 1.25rem; }

.footer__tagline {
  font-size: 0.8125rem;
  opacity: 0.7;
  margin-top: 0.25rem;
}

.footer__contacts p {
  font-size: 0.875rem;
  margin-bottom: 0.25rem;
}

.footer__copy {
  font-size: 0.75rem;
  opacity: 0.5;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1rem;
  text-align: center;
  grid-column: 1 / -1;
}

@media (min-width: 600px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

/* ============================================
   MAIN CONTENT (sidebar + article)
   ============================================ */
.main-content {
  padding: 2.5rem 0;
  background: var(--c-bg);
}

.main-content__inner {
  display: grid;
  gap: 2rem;
}

@media (min-width: 900px) {
  .main-content { padding: 3.5rem 0; }
  .main-content__inner {
    grid-template-columns: 260px 1fr;
    gap: 2.5rem;
  }
}

/* --- Sidebar --- */
.sidebar {
  background: linear-gradient(to right, var(--c-primary) 0%, #6b9fd4 30%, #c8ddf0 60%, #e8f0f8 80%, transparent 100%);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1.25rem 0;
  align-self: start;
  margin-right: -1rem;
  padding-right: 1rem;
}

.sidebar__menu {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
}

.sidebar__link {
  display: block;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: #1a1a2e;
  transition: var(--transition);
  text-decoration: none;
}

.sidebar__link:hover {
  background: rgba(255,255,255,0.45);
  padding-left: 1.5rem;
}

/* --- Content area --- */
.content-area {
  font-size: 0.9375rem;
  line-height: 1.65;
}

.content-area__title {
  font-size: clamp(1.25rem, 3vw, 1.625rem);
  font-weight: 700;
  color: var(--c-text);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--c-border);
}

.content-area p {
  margin-bottom: 0.875rem;
}

.content-area strong {
  color: var(--c-text);
}

.content-list {
  margin: 0 0 1.25rem 1.25rem;
  padding: 0;
}

.content-list li {
  margin-bottom: 0.5rem;
  padding-left: 0.25rem;
}

.content-area a {
  color: var(--c-primary);
  text-decoration: underline;
}

.content-area a:hover {
  color: var(--c-primary-dark);
}

/* --- Figure / images --- */
.content-figure {
  margin: 1.5rem 0;
}

.content-figure__images {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 0.75rem;
}

.content-figure__images img {
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  max-height: 400px;
  object-fit: contain;
}

.content-figure figcaption {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  text-align: center;
  font-style: italic;
}

/* ============================================
   FOOTER — v2
   ============================================ */
.footer__contacts a {
  color: rgba(255,255,255,0.8);
  transition: var(--transition);
}

.footer__contacts a:hover {
  color: #fff;
  text-decoration: underline;
}

.footer__info {
  font-size: 0.8125rem;
  opacity: 0.7;
  line-height: 1.5;
}

.footer__info p {
  margin-bottom: 0.125rem;
}

.footer__design {
  font-size: 0.8125rem;
  opacity: 0.6;
}

.footer__design a {
  color: rgba(255,255,255,0.85);
  text-decoration: underline;
  transition: var(--transition);
}

.footer__design a:hover {
  color: #fff;
}

@media (min-width: 600px) {
  .footer__inner {
    grid-template-columns: 1fr 1fr;
  }
  .footer__info {
    grid-column: 1 / -1;
  }
  .footer__design {
    grid-column: 1 / -1;
  }
}

@media (min-width: 900px) {
  .footer__inner {
    grid-template-columns: 1.2fr 1fr 1.5fr auto;
    align-items: start;
  }
  .footer__info {
    grid-column: auto;
  }
  .footer__design {
    grid-column: auto;
    text-align: right;
  }
}

/* ============================================
   CONTACTS PAGE
   ============================================ */
.contacts-text {
  margin-top: 1.5rem;
}

.contacts-text p {
  margin-bottom: 1.25rem;
  line-height: 1.7;
}

.contacts-text strong {
  font-weight: 700;
  color: var(--c-text);
}

.contacts-text a {
  color: var(--c-primary);
  text-decoration: underline;
}

.contacts-text a:hover {
  color: var(--c-primary-dark);
}

/* ============================================
   UTILITIES
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}