/* =============================================
   ДЕЛЬТА ОПТ — sайт-открытка
   ============================================= */

:root{
  --bg: #e9ebee;
  --bg-soft: #dfe2e6;
  --card: rgba(255,255,255,0.62);
  --card-border: rgba(16,18,22,0.20);
  --text: #16181c;
  --muted: #34363c;
  --accent: #0d7fae;
  --accent-2: #4757c9;
  --radius: 18px;
  --container: 1180px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

body{
  margin: 0;
  font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background-color: var(--bg);
  line-height: 1.55;
}

/* Фоновая картинка отдельным фиксированным слоем — не зависит от высоты
   страницы и не "обрезается" на длинных экранах. Фото ноутбука — на весь
   сайт, плавно уходит под текст. */
.bg-fixed{
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(180deg, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0.9) 100%),
    url('../images/bg-notebook-open.jpg');
  background-repeat: no-repeat;
  background-position: center center;
  background-size: cover;
}

.container{
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

img{ max-width: 100%; display: block; }
a{ color: inherit; text-decoration: none; }
h1,h2,h3{ margin: 0 0 .5em; font-weight: 800; letter-spacing: -0.02em; }
p{ margin: 0 0 1em; color: var(--muted); }

/* ---------- Buttons ---------- */
.btn{
  display: inline-block;
  padding: 14px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease, border-color .2s ease;
}
.btn-primary{
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #ffffff;
  box-shadow: 0 10px 26px -10px rgba(13,127,174,0.45);
}
.btn-primary:hover{ transform: translateY(-3px); box-shadow: 0 14px 30px -8px rgba(13,127,174,0.6); }
.btn-ghost{
  border: 1px solid var(--card-border);
  color: var(--text);
  background: rgba(16,18,22,0.03);
}
.btn-ghost:hover{ transform: translateY(-3px); border-color: var(--accent); color: var(--accent); }

/* ---------- Header ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(233,235,238,0.78);
  border-bottom: 1px solid var(--card-border);
}
.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  gap: 24px;
}
.logo{
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.logo span{ color: var(--accent); }

.main-nav{
  display: flex;
  gap: 28px;
  flex: 1;
  justify-content: center;
}
.main-nav a{
  display: inline-block;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color .2s ease, transform .2s ease;
}
.main-nav a:hover{ color: var(--accent); transform: translateY(-2px); }

.header-phone{
  font-weight: 700;
  color: var(--accent);
  white-space: nowrap;
  font-size: 0.95rem;
}

.burger{
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
}
.burger span{
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}

/* ---------- Hero ---------- */
.hero{ padding: 90px 0 70px; }
.eyebrow, .section-eyebrow{
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 14px;
}
.hero-text h1{
  font-size: clamp(2.1rem, 4vw, 3.1rem);
  line-height: 1.12;
}
.hero-sub{ font-size: 1.05rem; max-width: 46ch; }
.hero-actions{ display: flex; gap: 16px; flex-wrap: wrap; margin-top: 8px; }

/* ---------- Section shells ---------- */
section{ padding: 90px 0; }
.section-sub{ max-width: 60ch; font-size: 1.02rem; }
.section-sub a{ color: var(--accent); font-weight: 700; }
.section-sub a:hover{ text-decoration: underline; }
h2{ font-size: clamp(1.7rem, 3vw, 2.3rem); }

/* ---------- About ---------- */
.about-text{ max-width: 70ch; font-size: 1.05rem; }

.feature-grid{
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.feature-card{
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 26px 22px;
  box-shadow: 0 8px 22px -14px rgba(16,18,22,0.35);
}
.feature-icon{ font-size: 1.6rem; margin-bottom: 10px; }
.feature-card h3{ font-size: 1.05rem; margin-bottom: 8px; }
.feature-card p{ font-size: 0.92rem; margin: 0; }

.hours-strip{
  margin-top: 36px;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 16px 22px;
  border-radius: 999px;
  background: var(--card);
  border: 1px solid var(--card-border);
  width: fit-content;
  font-size: 0.92rem;
}
.hours-label{ font-weight: 700; color: var(--text); }
.hours-strip .dot{ color: var(--accent); }

/* ---------- Catalog ---------- */
.catalog-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.product-card{
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: 0 8px 22px -14px rgba(16,18,22,0.35);
  transition: border-color .25s ease;
}
.product-card:hover{ border-color: var(--accent); }
.product-icon{ font-size: 1.9rem; margin-bottom: 12px; }
.product-card h3{ font-size: 1.1rem; margin-bottom: 6px; }
.product-note{ font-size: 0.85rem; margin-bottom: 14px; }
.product-link{ font-weight: 700; color: var(--accent); font-size: 0.9rem; }

/* ---------- Reviews ---------- */
.reviews-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.review-card{
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  box-shadow: 0 8px 22px -14px rgba(16,18,22,0.35);
}
.stars{ color: var(--accent); letter-spacing: 2px; margin-bottom: 12px; }
.review-text{ font-size: 0.96rem; }
.review-author{ font-weight: 700; color: var(--text); margin: 0; }

/* ---------- Contacts ---------- */
.contacts-inner{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.contact-list{
  list-style: none;
  padding: 0;
  margin: 28px 0 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.contact-list li{
  display: flex;
  flex-direction: column;
  gap: 4px;
  border-bottom: 1px solid var(--card-border);
  padding-bottom: 16px;
}
.contact-label{
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--accent);
  font-weight: 700;
}
.contact-value{ font-size: 1.02rem; color: var(--text); }

.map-embed{
  height: 340px;
  border-radius: var(--radius);
  border: 1px solid var(--card-border);
  background: var(--card);
  overflow: hidden;
}
.map-embed iframe{ display: block; width: 100%; height: 100%; }
.map-btn{ margin-top: 14px; width: 100%; text-align: center; }
.contact-value a{ color: var(--text); transition: color .2s ease; }
.contact-value a:hover{ color: var(--accent); }

.phone-list{ display: flex; flex-direction: column; gap: 6px; }
.phone-list small{ color: var(--muted); font-weight: 500; font-size: 0.88rem; }

/* ---------- Requisites ---------- */
.req-card{
  margin-top: 36px;
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 8px 28px;
  box-shadow: 0 8px 22px -14px rgba(16,18,22,0.35);
}
.req-list{ margin: 0; }
.req-row{
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--card-border);
}
.req-row:last-child{ border-bottom: none; }
.req-row dt{
  font-size: 0.88rem;
  color: var(--muted);
  font-weight: 600;
}
.req-row dd{
  margin: 0;
  color: var(--text);
  font-weight: 600;
}

/* ---------- Footer ---------- */
.site-footer{
  border-top: 1px solid var(--card-border);
  padding: 40px 0;
}
.footer-inner{
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}
.footer-note{ margin: 0; }
.footer-copy{ margin: 0; font-size: 0.85rem; color: #7a7e87; }

/* ---------- Responsive ---------- */
@media (max-width: 960px){
  .main-nav{ display: none; }
  .burger{ display: flex; }
  .feature-grid{ grid-template-columns: repeat(2, 1fr); }
  .catalog-grid{ grid-template-columns: repeat(2, 1fr); }
  .reviews-grid{ grid-template-columns: 1fr; }
  .contacts-inner{ grid-template-columns: 1fr; }
  .req-row{ grid-template-columns: 1fr; gap: 4px; }
  .req-card{ padding: 8px 20px; }
}

@media (max-width: 560px){
  .feature-grid{ grid-template-columns: 1fr; }
  .catalog-grid{ grid-template-columns: 1fr; }
  .header-phone{ display: none; }
  section{ padding: 64px 0; }
  .hero{ padding: 64px 0 48px; }
}

/* mobile nav open state */
.main-nav.is-open{
  display: flex;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  flex-direction: column;
  background: rgba(233,235,238,0.98);
  border-bottom: 1px solid var(--card-border);
  padding: 18px 24px 24px;
  gap: 16px;
}