/* StackTel — оператор связи. Тема: надёжность, технологии, тёмная палитра с акцентом */

:root {
  --bg: #0a0e14;
  --bg-card: #111820;
  --bg-elevated: #161d28;
  --text: #e6edf5;
  --text-muted: #8b9cb3;
  --accent: #00d4aa;
  --accent-dim: #00a884;
  --accent-glow: rgba(0, 212, 170, 0.25);
  --border: #252d3a;
  --radius: 12px;
  --font-display: 'Unbounded', sans-serif;
  --font-body: 'Onest', system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 14, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.02em;
}

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

.nav {
  display: flex;
  gap: 32px;
}

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

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

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 1px;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.4;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 50%, black, transparent);
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.5;
}

.glow-1 {
  width: 400px;
  height: 400px;
  background: var(--accent-glow);
  top: -100px;
  right: -100px;
}

.glow-2 {
  width: 300px;
  height: 300px;
  background: rgba(0, 120, 200, 0.2);
  bottom: 10%;
  left: -80px;
}

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

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin: 0 0 20px;
  max-width: 14ch;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 0 32px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius);
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.btn-primary:hover {
  background: var(--accent-dim);
  box-shadow: 0 0 30px var(--accent-glow);
}

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

.btn-outline:hover {
  background: rgba(0, 212, 170, 0.1);
}

.hero-stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Sections common */
.section {
  padding: 100px 0;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}

.section-desc {
  color: var(--text-muted);
  font-size: 1.05rem;
  margin: 0 0 48px;
  max-width: 560px;
}

/* Services */
.services {
  background: var(--bg-elevated);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.card h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0 0 10px;
}

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

/* Workflow */
.workflow .steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
}

.step {
  position: relative;
  padding-left: 24px;
  border-left: 2px solid var(--border);
}

.step:last-child {
  border-left-color: var(--accent);
}

.step-num {
  position: absolute;
  left: -12px;
  top: -4px;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--bg);
  padding: 0 6px;
}

.step h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0 0 8px;
}

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

/* Contact */
.contact {
  background: var(--bg-elevated);
}

.contact-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.contact-info p {
  margin: 0 0 16px;
  color: var(--text-muted);
}

.contact-info a {
  color: var(--accent);
  text-decoration: none;
}

.contact-info a:hover {
  text-decoration: underline;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 18px;
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  transition: border-color 0.2s;
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--text-muted);
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.contact-form textarea {
  resize: vertical;
  min-height: 100px;
}

/* Footer */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--border);
}

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

/* Mobile menu */
@media (max-width: 768px) {
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
  }

  .nav.is-open {
    display: flex;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-stats {
    gap: 32px;
  }

  .contact-block {
    grid-template-columns: 1fr;
  }
}