/* =============================================
   Добрыня AI — main.css
   Базовые стили и CSS-переменные
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* --- Цветовые переменные --- */
:root {
  --color-bg:        #0D2818;
  --color-bg-light:  #1A3A1A;
  --color-accent:    #1DB87A;
  --color-accent-hover: #18a06a;
  --color-text:      #F5F0E8;
  --color-text-muted:#A0B8A0;
  --color-orange:    #E8632A;
  --color-card:      #162B1A;
  --color-border:    #2A4A2A;
}

/* --- Сброс и база --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity 0.2s ease;
}

a:hover {
  opacity: 0.8;
}

/* --- Типографика --- */
h1 { font-size: clamp(28px, 5vw, 48px); font-weight: 800; line-height: 1.15; }
h2 { font-size: clamp(22px, 4vw, 36px); font-weight: 700; line-height: 1.2; }
h3 { font-size: clamp(18px, 3vw, 24px); font-weight: 600; line-height: 1.3; }
h4 { font-size: 18px; font-weight: 600; }
p  { color: var(--color-text-muted); }
p strong { color: var(--color-text); }

/* --- Контейнер --- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* --- Кнопки --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-family: 'Inter', sans-serif;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background-color 0.2s ease, transform 0.1s ease;
  text-decoration: none;
}

.btn:hover {
  opacity: 1;
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

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

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

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

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

/* --- Карточки --- */
.card {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 16px;
  padding: 28px;
  transition: border-color 0.2s ease;
}

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

/* --- HEADER --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(13, 40, 24, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
}

.logo:hover {
  opacity: 1;
  color: var(--color-text);
}

.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  object-fit: cover;
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  color: var(--color-text-muted);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav a:hover,
.nav a.active {
  color: var(--color-text);
  opacity: 1;
}

.nav-cta {
  padding: 8px 20px;
  font-size: 14px;
}

/* Мобильное меню */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
}

.burger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.mobile-nav {
  display: none;
  background-color: var(--color-bg-light);
  border-bottom: 1px solid var(--color-border);
  padding: 16px 20px;
}

.mobile-nav a {
  display: block;
  color: var(--color-text-muted);
  font-size: 16px;
  font-weight: 500;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
}

.mobile-nav a:last-child {
  border-bottom: none;
}

.mobile-nav a:hover {
  color: var(--color-text);
  opacity: 1;
}

.mobile-nav.open {
  display: block;
}

/* --- FOOTER --- */
.site-footer {
  background-color: var(--color-bg-light);
  border-top: 1px solid var(--color-border);
  padding: 48px 0 32px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--color-border);
}

.footer-brand p {
  font-size: 14px;
  margin-top: 12px;
  max-width: 280px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-col ul {
  list-style: none;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  color: var(--color-text-muted);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-col ul li a:hover {
  color: var(--color-text);
  opacity: 1;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 24px;
  font-size: 13px;
  color: var(--color-text-muted);
}

/* --- Секции --- */
.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 48px;
}

.section-title h2 {
  margin-bottom: 12px;
}

.section-title p {
  font-size: 18px;
  max-width: 560px;
  margin: 0 auto;
}

/* --- Утилиты --- */
.text-accent   { color: var(--color-accent); }
.text-orange   { color: var(--color-orange); }
.text-muted    { color: var(--color-text-muted); }
.text-center   { text-align: center; }
.mt-4  { margin-top: 16px; }
.mt-8  { margin-top: 32px; }
.mt-12 { margin-top: 48px; }

/* --- Адаптив --- */
@media (max-width: 768px) {
  .nav { display: none; }
  .burger { display: flex; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .section {
    padding: 60px 0;
  }
}