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

:root {
  /* Палитра Clean Tech */
  --color-bg: #F8FAFC; /* Очень светлый холодный серый/голубой */
  --color-bg-alt: #F1F5F9;
  --color-surface: #FFFFFF;
  
  --color-ink: #0F172A; /* Глубокий темно-синий/slate для заголовков */
  --color-muted: #64748B; /* Slate для основного текста */
  --color-border: #E2E8F0;
  
  --color-primary: #2563EB; /* Технологичный синий */
  --color-primary-hover: #1D4ED8;
  --color-primary-soft: #DBEAFE;
  
  --color-accent: #0F766E; /* Глубокий Teal (бирюзовый) для кейсов */
  --color-accent-soft: #CCFBF1;

  /* Типографика как в современных IDE и SaaS */
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --container: 820px; /* Сделали чуть шире для B2B-вида */
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-muted); /* Основной текст светлее */
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, .logo {
  color: var(--color-ink);
  font-weight: 600;
  letter-spacing: -0.02em;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

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

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.2s ease;
  cursor: pointer;
}

.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border: 1px solid var(--color-primary);
  box-shadow: var(--shadow-sm);
}

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

/* ---------- Header ---------- */
.site-header {
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.site-header .logo {
  font-size: 18px;
  text-decoration: none;
}

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

.main-nav a {
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-muted);
  transition: color 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
}

/* ---------- Hero ---------- */
.hero {
  padding: 96px 0 64px;
}

.badge-tech {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 6px 12px;
  border-radius: 9999px;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.15;
  margin: 0 0 24px;
  max-width: 900px;
}

.hero p.lede {
  font-size: 18px;
  color: var(--color-muted);
  max-width: 700px;
  margin: 0 0 32px;
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.skills-tags span {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 6px 12px;
  border-radius: 6px;
  box-shadow: var(--shadow-sm);
}

/* ---------- Track cards (Home) ---------- */
.pt-0 { padding-top: 0 !important; }
.bg-light { background-color: var(--color-bg-alt); border-top: 1px solid var(--color-border); border-bottom: 1px solid var(--color-border);}

.tracks {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.track-card {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}

.track-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary-soft);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.track-card svg {
  color: var(--color-border);
  transition: color 0.2s, transform 0.2s;
}

.track-card:hover svg {
  transform: translateX(4px);
}

.track-card.projects:hover svg { color: var(--color-primary); }
.track-card.cases:hover svg { color: var(--color-accent); }

.track-label {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
}

.track-card.projects .track-label { color: var(--color-primary); }
.track-card.cases .track-label { color: var(--color-accent); }

.track-card h3 {
  font-size: 22px;
  margin: 0 0 12px;
}

.track-card p {
  font-size: 15px;
  margin: 0;
}

/* ---------- Summary Box (Hero bottom) ---------- */
.summary-box {
  display: flex;
  gap: 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 32px;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.summary-icon {
  flex-shrink: 0;
  color: var(--color-primary);
}

.summary-text p {
  margin: 0 0 16px;
  font-size: 15px;
  color: var(--color-ink);
}

.link-arrow {
  color: var(--color-primary);
  font-weight: 500;
  text-decoration: none;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
}

.link-arrow:hover {
  text-decoration: underline;
}

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

.section-title {
  font-size: 32px;
  margin: 0 0 12px;
}

.section-sub {
  font-size: 18px;
  margin: 0 0 48px;
  max-width: 65ch;
}

/* ---------- Entry rows (List pages) ---------- */
.entry-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.entry-row {
  display: flex;
  text-decoration: none;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.entry-row:hover {
  transform: translateX(4px);
  border-color: var(--color-primary-soft);
  box-shadow: var(--shadow-md);
}

.entry-row .rail {
  width: 4px;
  flex-shrink: 0;
}

.entry-row.projects .rail { background: var(--color-primary); }
.entry-row.cases .rail { background: var(--color-accent); }

.entry-row .body {
  padding: 24px;
  flex: 1;
}

.entry-row .meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  margin-bottom: 12px;
  display: flex;
  gap: 16px;
}

.entry-row.projects .meta span:first-child { color: var(--color-primary); font-weight: 500; }
.entry-row.cases .meta span:first-child { color: var(--color-accent); font-weight: 500; }

.entry-row h3 {
  font-size: 20px;
  margin: 0 0 8px;
}

.entry-row p {
  font-size: 15px;
  margin: 0;
}

/* ---------- Detail pages ---------- */
.detail-header {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.detail-header .back {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-muted);
  text-decoration: none;
  margin-bottom: 32px;
  transition: color 0.2s;
}

.detail-header .back:hover {
  color: var(--color-ink);
}

.detail-header .meta {
  font-family: var(--font-mono);
  font-size: 13px;
  margin-bottom: 20px;
  display: flex;
  gap: 16px;
}

.detail-header.projects .meta { color: var(--color-primary); font-weight: 500; }
.detail-header.cases .meta { color: var(--color-accent); font-weight: 500; }

.detail-header h1 {
  font-size: clamp(32px, 4.5vw, 44px);
  margin: 0 0 16px;
}

.detail-header .dek {
  font-size: 18px;
  max-width: 700px;
  margin: 0;
}

.prose {
  padding: 64px 0;
}

.prose h2 {
  font-size: 24px;
  margin: 48px 0 24px;
}

.prose h2:first-child {
  margin-top: 0;
}

.prose p {
  margin: 0 0 24px;
  font-size: 16px;
}

.prose ul {
  margin: 0 0 24px;
  padding-left: 24px;
}

.prose li {
  margin-bottom: 12px;
}

.callout {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-primary);
  border-radius: 8px;
  padding: 24px;
  margin: 32px 0;
  box-shadow: var(--shadow-sm);
}

.callout.case-flavor {
  border-left-color: var(--color-accent);
}

.callout strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 8px;
  color: var(--color-ink);
}

.decision-block {
  border-top: 1px solid var(--color-border);
  padding: 32px 0;
}

.decision-block h3 {
  font-size: 20px;
  margin: 0 0 16px;
}

.stat-row {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  margin: 48px 0;
  padding: 40px 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: 12px;
  padding: 32px;
  box-shadow: var(--shadow-sm);
}

.stat .num {
  font-family: var(--font-mono);
  font-size: 36px;
  font-weight: 600;
}

.stat.projects .num { color: var(--color-primary); }
.stat.cases .num { color: var(--color-accent); }

.stat .label {
  font-size: 14px;
  color: var(--color-muted);
  margin-top: 8px;
}

/* ---------- About ---------- */
.about-body {
  padding: 8px 0 64px;
}

.about-body p {
  font-size: 16px;
  margin: 0 0 24px;
}

.about-body ul {
  padding-left: 24px;
  margin: 0 0 32px;
}

.about-body li {
  margin-bottom: 12px;
}

.contact-row {
  display: flex;
  gap: 16px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

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

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer p {
  font-family: var(--font-mono);
  font-size: 13px;
}

.site-footer .socials {
  display: flex;
  gap: 24px;
}

.site-footer .socials a {
  font-size: 14px;
  text-decoration: none;
  font-weight: 500;
  color: var(--color-muted);
}

.site-footer .socials a:hover {
  color: var(--color-ink);
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .tracks {
    grid-template-columns: 1fr;
  }
  .header-wrap {
    height: auto;
    flex-wrap: wrap;
    padding: 16px 0;
    gap: 16px;
  }
  .main-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 8px;
  }
  .header-actions {
    margin-left: auto;
  }
  .hero {
    padding: 56px 0 40px;
  }
  .summary-box {
    flex-direction: column;
    gap: 16px;
  }
}