/* ============================================================
   OpenDataUA — Enterprise Design System
   Primary #072C2C · Secondary #FF5F03 · Surface #EDEADE
   Type: Ubuntu (body) · Oswald (display) · Ubuntu Mono
   ============================================================ */

:root {
  /* ── Color tokens ─────────────────────────────────── */
  --color-primary:         #072C2C;
  --color-primary-hover:   #0A3D3D;
  --color-primary-active:  #051F1F;
  --color-secondary:       #FF5F03;
  --color-secondary-hover: #E55303;
  --color-success:         #16A34A;
  --color-success-bg:      #DCFCE7;
  --color-warning:         #D97706;
  --color-warning-bg:      #FEF3C7;
  --color-danger:          #DC2626;
  --color-danger-bg:       #FEE2E2;

  --color-surface:         #EDEADE;
  --color-surface-2:       #F5F3EB;  /* lifted background */
  --color-surface-3:       #FFFFFF;  /* elevated card */
  --color-text:            #111827;
  --color-text-muted:      #4B5563;
  --color-text-subtle:     #6B7280;
  --color-border:          #D6D2C4;  /* surface-tinted */
  --color-border-strong:   #9B9785;

  /* ── Typography ───────────────────────────────────── */
  --font-body:    'Ubuntu', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-display: 'Oswald', 'Ubuntu', system-ui, sans-serif;
  --font-mono:    'Ubuntu Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

  /* ── Spacing (comfortable density) ────────────────── */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 56px;
  --space-10: 72px;

  /* ── Radii & elevation ────────────────────────────── */
  --radius-sm: 4px;
  --radius:    6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 2px rgba(7, 44, 44, 0.06);
  --shadow:    0 4px 14px rgba(7, 44, 44, 0.08);
  --shadow-md: 0 10px 30px rgba(7, 44, 44, 0.12);

  /* ── Motion ───────────────────────────────────────── */
  --ease:     cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 180ms;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.55;
  color: var(--color-text);
  background: var(--color-surface);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.005em;
  color: var(--color-primary);
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
code, kbd, pre, samp { font-family: var(--font-mono); font-size: 0.92em; }

::selection { background: var(--color-secondary); color: #fff; }

/* ── Page shell ────────────────────────────────────── */
.page { display: flex; flex-direction: column; min-height: 100vh; }

/* ── Header ────────────────────────────────────────── */
.header {
  background: var(--color-primary);
  color: var(--color-surface);
  border-bottom: 3px solid var(--color-secondary);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-6);
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* ── Logo ──────────────────────────────────────────── */
.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-surface);
}

.logo__icon { width: 36px; height: 36px; flex-shrink: 0; }

.logo__text {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.logo__text strong { font-weight: 700; color: var(--color-secondary); }

/* ── Nav ───────────────────────────────────────────── */
.nav { display: flex; gap: var(--space-1); }

.nav__link {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-surface);
  opacity: 0.78;
  transition: opacity var(--duration) var(--ease),
              background var(--duration) var(--ease);
}

.nav__link:hover,
.nav__link:focus-visible { opacity: 1; background: rgba(255, 255, 255, 0.06); }
.nav__link:focus-visible { outline: 2px solid var(--color-secondary); outline-offset: 2px; }

.nav__link--active {
  opacity: 1;
  background: rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 -2px 0 var(--color-secondary);
}

/* ── Hero ──────────────────────────────────────────── */
.hero {
  position: relative;
  padding: var(--space-10) var(--space-6) var(--space-9);
  margin: var(--space-8) auto 0;
  max-width: 1200px;
  background: var(--color-primary);
  color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  isolation: isolate;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 88% 18%, rgba(255, 95, 3, 0.22), transparent 55%),
    radial-gradient(circle at 12% 80%, rgba(255, 255, 255, 0.05), transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.hero__content { position: relative; z-index: 1; max-width: 720px; }

.hero__badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: rgba(255, 95, 3, 0.12);
  color: var(--color-secondary);
  border: 1px solid rgba(255, 95, 3, 0.4);
  border-radius: var(--radius-sm);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-5);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.8vw, 3.25rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--color-surface);
  margin-bottom: var(--space-5);
}

.hero__subtitle {
  font-size: 1.05rem;
  line-height: 1.6;
  color: rgba(237, 234, 222, 0.78);
}

/* ── Services grid ─────────────────────────────────── */
.services { padding: var(--space-8) var(--space-6); max-width: 1200px; margin: 0 auto; }

.services__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

/* ── Service card ──────────────────────────────────── */
.service-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  background: var(--color-surface-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-7);
  box-shadow: var(--shadow-sm);
  color: var(--color-text);
  transition: transform var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}

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

.service-card:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 3px;
}

.service-card__icon-wrap { display: flex; }
.service-card__icon { width: 64px; height: 64px; }

.service-card__title {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: 0.005em;
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.service-card__desc {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.service-card__features {
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.service-card__features li {
  position: relative;
  padding-left: var(--space-5);
  font-size: 0.9rem;
  color: var(--color-text);
}

.service-card__features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 10px;
  height: 2px;
  background: var(--color-secondary);
}

.service-card__action {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: auto;
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.service-card__arrow {
  width: 20px;
  height: 20px;
  color: var(--color-primary);
  transition: transform var(--duration) var(--ease);
}

.service-card:hover .service-card__arrow { transform: translateX(4px); }

/* ── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: background var(--duration) var(--ease),
              color var(--duration) var(--ease),
              border-color var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}

.btn:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.btn--primary  { background: var(--color-primary);   color: var(--color-surface); }
.btn--primary:hover  { background: var(--color-primary-hover); }
.btn--primary:active { background: var(--color-primary-active); }

.btn--secondary { background: var(--color-secondary); color: #fff; }
.btn--secondary:hover { background: var(--color-secondary-hover); }

.btn--success { background: var(--color-success); color: #fff; }
.btn--success:hover { background: #128A3E; }

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border-strong);
}
.btn--ghost:hover {
  background: var(--color-primary);
  color: var(--color-surface);
  border-color: var(--color-primary);
}

/* ── Info strip ────────────────────────────────────── */
.info-strip {
  background: var(--color-surface-3);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-7) var(--space-6);
  margin-bottom: auto;
}

.info-strip__inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-7);
}

.info-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
}

.info-item__icon { width: 28px; height: 28px; flex-shrink: 0; color: var(--color-primary); }

.info-item div { display: flex; flex-direction: column; }

.info-item strong {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-1);
}

.info-item span {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* ── Footer ────────────────────────────────────────── */
.footer {
  background: var(--color-primary);
  color: rgba(237, 234, 222, 0.65);
  border-top: 3px solid var(--color-secondary);
  padding: var(--space-5) var(--space-6);
  text-align: center;
}

.footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 800px) {
  .services__grid { grid-template-columns: 1fr; }
  .info-strip__inner { grid-template-columns: 1fr; gap: var(--space-5); }
  .hero { padding: var(--space-9) var(--space-5); margin: var(--space-5) var(--space-3) 0; }
  .services { padding: var(--space-6) var(--space-4); }
}

@media (max-width: 560px) {
  .nav { gap: 0; }
  .nav__link { padding: var(--space-2) var(--space-3); font-size: 0.78rem; }
  .header__inner { padding: 0 var(--space-4); }
}