/* КАРД-СІСТЕМС — лендінг, комп'ютерне програмування */

:root {
  --bg-dark: #0f1419;
  --bg-card: #1a2332;
  --bg-section: #151d28;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-muted: rgba(59, 130, 246, 0.15);
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --border: #2d3a4d;
  --font-sans: 'Manrope', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius: 12px;
  --container: min(1100px, 92vw);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-dark);
}

.container {
  width: var(--container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 20, 25, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo:hover {
  color: var(--accent);
}

.nav {
  display: flex;
  gap: 1.75rem;
  flex-wrap: wrap;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  padding: 4rem 0 5rem;
  background: linear-gradient(180deg, var(--bg-section) 0%, var(--bg-dark) 100%);
}

.hero-inner {
  max-width: 720px;
}

.hero-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.03em;
  margin: 0 0 1.25rem;
}

.hero-lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  margin: 0 0 2rem;
  max-width: 580px;
}

.hero-cta {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border-radius: var(--radius);
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  border: 2px solid var(--accent);
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
}

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}

.btn-outline:hover {
  background: var(--accent-muted);
}

.btn-large {
  padding: 1rem 2rem;
  font-size: 1rem;
}

/* Sections */
.section {
  padding: 4rem 0;
}

.section:nth-child(even) {
  background: var(--bg-section);
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 1.85rem);
  font-weight: 700;
  margin: 0 0 1rem;
  letter-spacing: -0.02em;
}

.section-intro {
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 0 2.5rem;
  font-size: 1.05rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.about-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.about-block h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
  color: var(--accent);
}

.about-block p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* Services — cards */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-muted);
}

.card h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* Tech blocks */
.tech-blocks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.tech-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.tech-block h4 {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--accent);
  margin: 0 0 0.6rem;
}

.tech-block p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* Advantages */
.advantages-list {
  display: grid;
  gap: 1.25rem;
  max-width: 720px;
}

.advantage-item {
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.advantage-item h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.advantage-item p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.98rem;
}

/* Process steps */
.process-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
}

.process-step {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  padding-top: 3rem;
}

.step-num {
  position: absolute;
  top: 1rem;
  left: 1.25rem;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent);
  opacity: 0.9;
}

.process-step h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.process-step p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

/* CTA */
.section-cta {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-section) 100%);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.cta-inner {
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}

.cta-title {
  font-size: clamp(1.35rem, 2.5vw, 1.6rem);
  font-weight: 700;
  margin: 0 0 0.75rem;
}

.cta-inner p {
  color: var(--text-muted);
  margin: 0 0 1.5rem;
}

/* Contacts */
.contacts-block {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  margin-bottom: 1.5rem;
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.contact-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-value {
  font-size: 1.2rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

.contact-value:hover {
  color: #60a5fa;
}

.contacts-note {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin: 0;
  max-width: 520px;
}

/* Footer */
.footer {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-section);
}

.footer-inner {
  text-align: center;
}

.footer-copy {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 640px) {
  .nav {
    gap: 1rem;
  }

  .hero {
    padding: 3rem 0 4rem;
  }

  .section {
    padding: 3rem 0;
  }

  .contacts-block {
    flex-direction: column;
    gap: 1.25rem;
  }
}