/* ═══════════════════════════════════════════════
   INFRACAST — Premium Landing CSS
   Design: Anthropic-style minimal / B2B
   ═══════════════════════════════════════════════ */

/* ─── 1. Design Tokens ─────────────────────────── */

:root {
  /* Light theme */
  --bg:          #F7F4EF;
  --bg-2:        #F0EBE3;
  --bg-card:     #FFFFFF;
  --bg-card-2:   #FAF8F5;
  --border:      rgba(0, 0, 0, 0.08);
  --border-2:    rgba(0, 0, 0, 0.12);

  --text-primary:   #1A1917;
  --text-secondary: #6B6560;
  --text-muted:     #9C9590;

  --accent:         #B86040;   /* Терракота */
  --accent-hover:   #A05234;
  --accent-fg:      #FFFFFF;

  --graphite:       #3D3A36;

  --nav-bg:      rgba(247, 244, 239, 0.85);
  --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 8px 32px rgba(0,0,0,0.04);
  --card-shadow-hover: 0 2px 8px rgba(0,0,0,0.08), 0 16px 48px rgba(0,0,0,0.08);

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;

  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --transition: 240ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 480ms cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  --bg:          #111110;
  --bg-2:        #181714;
  --bg-card:     #1C1B19;
  --bg-card-2:   #211F1D;
  --border:      rgba(255, 255, 255, 0.07);
  --border-2:    rgba(255, 255, 255, 0.12);

  --text-primary:   #F0EDE8;
  --text-secondary: #9C9690;
  --text-muted:     #6B6560;

  --accent:         #C8714E;
  --accent-hover:   #D47F5A;
  --accent-fg:      #FFFFFF;

  --graphite:       #C8C4BE;

  --nav-bg:      rgba(17, 17, 16, 0.88);
  --card-shadow: 0 1px 3px rgba(0,0,0,0.3), 0 8px 32px rgba(0,0,0,0.25);
  --card-shadow-hover: 0 2px 8px rgba(0,0,0,0.4), 0 16px 48px rgba(0,0,0,0.35);
}

/* ─── 2. Reset & Base ──────────────────────────── */

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.65;
  transition: background var(--transition-slow), color var(--transition-slow);
  overflow-x: hidden;
}

img, svg { display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ─── 3. Layout Utilities ──────────────────────── */

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

@media (min-width: 768px) {
  .container { padding: 0 40px; }
}
@media (min-width: 1200px) {
  .container { padding: 0 48px; }
}

/* ─── 4. Typography ────────────────────────────── */

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}

.section-heading {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  line-height: 1.18;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.section-sub {
  font-size: 17px;
  color: var(--text-secondary);
  max-width: 520px;
  line-height: 1.65;
  margin-bottom: 64px;
}

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

/* ─── 5. Buttons ───────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  cursor: pointer;
  border: none;
  transition: background var(--transition), color var(--transition),
              box-shadow var(--transition), transform var(--transition);
  white-space: nowrap;
  text-decoration: none;
}

.btn svg { flex-shrink: 0; transition: transform var(--transition); }
.btn:hover svg { transform: translateX(3px); }

.btn--primary {
  background: var(--accent);
  color: var(--accent-fg);
}
.btn--primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 20px rgba(184, 96, 64, 0.35);
  transform: translateY(-1px);
}
.btn--primary:active { transform: translateY(0); }

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-2);
}
.btn--ghost:hover {
  color: var(--text-primary);
  border-color: var(--border-2);
  background: var(--bg-card);
}

.btn--outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn--outline:hover {
  background: var(--accent);
  color: var(--accent-fg);
  transform: translateY(-1px);
}

/* ─── 6. Header ────────────────────────────────── */

.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 64px;
  background: var(--nav-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-slow), border-color var(--transition-slow);
}

.header-inner {
  display: flex;
  align-items: center;
  height: 64px;
  gap: 40px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: 'Space Grotesk', var(--font);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  flex-shrink: 0;
  transition: opacity var(--transition);
}

.site-header .logo {
  margin-right: auto;
}
.logo:hover { opacity: 0.7; }

.logo-icon {
  width: 32px;
  height: 32px;
  flex-shrink: 0;
}

.logo-text {
  /* Inherits from .logo */
}

.nav {
  display: none;
  gap: 6px;
}
@media (min-width: 768px) { .nav { display: flex; } }

.nav-link {
  font-size: 14px;
  font-weight: 450;
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover {
  color: var(--text-primary);
  background: var(--border);
}

/* Theme toggle */
.theme-toggle {
  width: 38px; height: 38px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-secondary);
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  position: relative;
  flex-shrink: 0;
}
.theme-toggle:hover {
  background: var(--bg-2);
  color: var(--text-primary);
}

.theme-toggle__icon {
  position: absolute;
  display: flex; align-items: center; justify-content: center;
  transition: opacity var(--transition), transform var(--transition);
}

/* Light theme: show moon (to switch to dark) */
[data-theme="light"] .theme-toggle__sun  { opacity: 0; transform: rotate(90deg) scale(0.7); }
[data-theme="light"] .theme-toggle__moon { opacity: 1; transform: rotate(0deg) scale(1); }
/* Dark theme: show sun (to switch to light) */
[data-theme="dark"]  .theme-toggle__moon { opacity: 0; transform: rotate(-90deg) scale(0.7); }
[data-theme="dark"]  .theme-toggle__sun  { opacity: 1; transform: rotate(0deg) scale(1); }

/* Burger */
.burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: none; border: none; cursor: pointer;
  padding: 4px;
}
@media (min-width: 768px) { .burger { display: none; } }

.burger span {
  display: block;
  height: 1.5px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition), width var(--transition);
}
.burger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; width: 0; }
.burger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav */
.mobile-nav {
  position: fixed;
  inset: 64px 0 0 0;
  background: var(--bg);
  z-index: 99;
  display: flex;
  flex-direction: column;
  padding: 24px;
  gap: 4px;
  transform: translateX(100%);
  transition: transform var(--transition-slow);
  border-top: 1px solid var(--border);
}
.mobile-nav.open { transform: translateX(0); }

.mobile-nav__link {
  font-size: 22px;
  font-weight: 400;
  color: var(--text-primary);
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
  transition: color var(--transition), padding-left var(--transition);
}
.mobile-nav__link:hover { color: var(--accent); padding-left: 8px; }

/* ─── 7. Hero ──────────────────────────────────── */

.hero {
  position: relative;
  padding: 160px 0 120px;
  overflow: hidden;
}
@media (min-width: 768px) { .hero { padding: 180px 0 140px; } }

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 28px;
}
.hero-eyebrow::before {
  content: '';
  display: inline-block;
  width: 20px; height: 1.5px;
  background: var(--accent);
  border-radius: 1px;
}

.hero-heading {
  font-size: clamp(36px, 6vw, 72px);
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: -0.035em;
  color: var(--text-primary);
  max-width: 800px;
  margin-bottom: 28px;
}

.hero-sub {
  font-size: clamp(16px, 2vw, 19px);
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 44px;
  font-weight: 350;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 80px;
}

/* Stats strip */
.hero-stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  align-items: center;
  max-width: 540px;
}
.hero-stat {
  display: flex;
  flex-direction: column;
  padding: 0 24px 0 0;
}
.hero-stat:first-child { padding-left: 0; }
.hero-stat__number {
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 4px;
}
.hero-stat__label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
  line-height: 1.3;
  max-width: 100px;
}
.hero-stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border-2);
  margin: 0 24px;
  flex-shrink: 0;
}

/* Background decorative grid */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 70% 40%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 70% 40%, black 0%, transparent 80%);
  opacity: 0.6;
}

/* ─── 8. Solutions ─────────────────────────────── */

.solutions {
  padding: 120px 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-slow);
}

.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 640px) {
  .cards-grid { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 1024px) {
  .cards-grid { grid-template-columns: 1fr 1fr; }
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px 32px;
  display: flex;
  flex-direction: column;
  gap: 0;
  box-shadow: var(--card-shadow);
  transition: box-shadow var(--transition), transform var(--transition),
              background var(--transition-slow), border-color var(--transition-slow);
}
.card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-4px);
}

/* Featured dark card */
.card--accent {
  background: var(--graphite);
  border-color: transparent;
  color: #F0EDE8;
}
[data-theme="dark"] .card--accent {
  background: #2B2926;
  border-color: var(--border);
}
.card--accent .card__tag,
.card--accent .card__title,
.card--accent .card__body,
.card--accent .card__icon { color: #F0EDE8; }
.card--accent .card__pill {
  background: rgba(255,255,255,0.12);
  color: rgba(255,255,255,0.75);
  border-color: rgba(255,255,255,0.15);
}

/* Sovereign AI card */
.card--ai {
  border-color: rgba(184, 96, 64, 0.25);
  background: var(--bg-card);
  position: relative;
  overflow: hidden;
}
.card--ai::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 100% 0%, rgba(184,96,64,0.06) 0%, transparent 65%);
  pointer-events: none;
}
[data-theme="dark"] .card--ai {
  border-color: rgba(200, 113, 78, 0.3);
}
[data-theme="dark"] .card--ai::before {
  background: radial-gradient(ellipse 80% 60% at 100% 0%, rgba(200,113,78,0.09) 0%, transparent 65%);
}

/* Badge «Новинка» */
.card__badge {
  display: inline-flex;
  align-items: center;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  background: rgba(184, 96, 64, 0.1);
  border: 1px solid rgba(184, 96, 64, 0.2);
  border-radius: 100px;
  padding: 3px 9px;
  margin-bottom: 8px;
  width: fit-content;
}
[data-theme="dark"] .card__badge {
  background: rgba(200, 113, 78, 0.12);
  border-color: rgba(200, 113, 78, 0.25);
}

/* Result line */
.card__result {
  font-size: 13px;
  font-weight: 500;
  color: var(--accent);
  padding: 10px 14px;
  background: rgba(184, 96, 64, 0.07);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  border-left: 2.5px solid var(--accent);
}
[data-theme="dark"] .card__result {
  background: rgba(200, 113, 78, 0.1);
}

.card__icon {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-2);
  border-radius: var(--radius-sm);
  margin-bottom: 24px;
  color: var(--accent);
  transition: background var(--transition-slow);
  flex-shrink: 0;
}
.card--accent .card__icon {
  background: rgba(255,255,255,0.1);
  color: #F0EDE8;
}

.card__tag {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.card--accent .card__tag { color: rgba(255,255,255,0.55); }

.card__title {
  font-size: 20px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 14px;
  line-height: 1.25;
}

.card__body {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text-secondary);
  flex: 1;
  margin-bottom: 28px;
}
.card__body strong { color: var(--text-primary); font-weight: 500; }
.card--accent .card__body { color: rgba(240,237,232,0.75); }
.card--accent .card__body strong { color: #F0EDE8; }

.card__footer {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: auto;
}

.card__pill {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 4px 10px;
  border-radius: 100px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: background var(--transition-slow);
}

/* ─── 9. Approach ──────────────────────────────── */

.approach {
  padding: 140px 0;
}

.approach-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 72px;
}
@media (min-width: 900px) {
  .approach-inner {
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
  }
}

.approach-left { }
.approach-desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 400px;
}

.approach-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.approach-item {
  display: flex;
  gap: 24px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  align-items: flex-start;
}
.approach-item:first-child { border-top: 1px solid var(--border); }

.approach-item__num {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.05em;
  padding-top: 4px;
  flex-shrink: 0;
  width: 24px;
}

.approach-item__title {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.3;
}

.approach-item__text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ─── 10. CTA Band ─────────────────────────────── */

.cta-band {
  padding: 100px 0;
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition-slow);
}

.cta-band__inner {
  display: flex;
  flex-direction: column;
  gap: 40px;
  align-items: flex-start;
}
@media (min-width: 768px) {
  .cta-band__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
  }
}

.cta-band__heading {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 400;
  letter-spacing: -0.025em;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.2;
}

.cta-band__sub {
  font-size: 16px;
  color: var(--text-secondary);
}

.cta-band__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  flex-shrink: 0;
}

/* ─── 11. Footer ───────────────────────────────── */

.site-footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-link {
  font-size: 14px;
  color: var(--text-muted);
  transition: color var(--transition);
}
.footer-link:hover { color: var(--accent); }

/* ─── 12. Reveal Animations ────────────────────── */

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.65s cubic-bezier(0.4, 0, 0.2, 1);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger for card children */
.cards-grid .card:nth-child(1).reveal { transition-delay: 0ms; }
.cards-grid .card:nth-child(2).reveal { transition-delay: 80ms; }
.cards-grid .card:nth-child(3).reveal { transition-delay: 160ms; }
.cards-grid .card:nth-child(4).reveal { transition-delay: 240ms; }

.approach-item:nth-child(1).reveal { transition-delay: 0ms; }
.approach-item:nth-child(2).reveal { transition-delay: 80ms; }
.approach-item:nth-child(3).reveal { transition-delay: 160ms; }

/* ─── 13. Scrollbar ────────────────────────────── */

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb {
  background: var(--border-2);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ─── 14. Focus Visible ────────────────────────── */

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ─── 15. Responsive misc ──────────────────────── */

@media (max-width: 480px) {
  .hero-stat-row { gap: 16px 0; }
  .hero-stat-divider { display: none; }
  .hero-stat { padding: 0; }
  .hero-stat__label { max-width: none; }
}