/* Plato VPN — classical, scholarly, principle-driven aesthetic */
/* Fonts: Marcellus (serif headings) + IBM Plex Sans (body) */

:root {
  --primary: #4D7C0F;
  --primary-dark: #365314;
  --primary-soft: #DCF1B4;
  --accent: #075985;
  --accent-dark: #0C4A6E;
  --bg: #FAFAF7;
  --bg-alt: #F0F4ED;
  --text: #1A1F0F;
  --text-muted: #5C6650;
  --card-bg: #FFFFFF;
  --border: #E2E8D5;
  --radius: 11px;
  --radius-sm: 7px;
  --radius-lg: 18px;
  --shadow-sm: 0 1px 2px rgba(26, 31, 15, 0.04);
  --shadow: 0 4px 14px rgba(26, 31, 15, 0.06);
  --shadow-lg: 0 18px 38px rgba(26, 31, 15, 0.09);
  --shadow-hover: 0 22px 50px rgba(77, 124, 15, 0.18);
  --transition: 0.32s cubic-bezier(.2,.7,.3,1);
  --container: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: 'Marcellus', 'Times New Roman', serif;
  font-weight: 400;
  letter-spacing: -0.005em;
  color: var(--text);
}

h1 { font-size: clamp(2.6rem, 6vw, 5.4rem); line-height: 1.04; letter-spacing: -0.02em; }
h2 { font-size: clamp(2rem, 3.6vw, 3.1rem); line-height: 1.12; }
h3 { font-size: 1.45rem; line-height: 1.3; }
h4 { font-size: 1.15rem; line-height: 1.35; }

p { color: var(--text); }

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-dark); }

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}

/* ========== HEADER (Nav A — white sticky with shadow) ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.site-header.scrolled {
  box-shadow: 0 2px 16px rgba(26, 31, 15, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 32px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-mark {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  display: grid;
  place-items: center;
  color: #fff;
  font-family: 'Marcellus', serif;
  font-size: 22px;
  box-shadow: 0 2px 8px rgba(77, 124, 15, 0.32);
}

.logo-text {
  font-family: 'Marcellus', serif;
  font-size: 1.45rem;
  color: var(--text);
  letter-spacing: 0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  list-style: none;
}

.nav-links a {
  color: var(--text);
  font-size: 0.97rem;
  font-weight: 500;
  position: relative;
  padding: 6px 0;
}

.nav-links a:not(.nav-cta)::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
}

.nav-links a:not(.nav-cta):hover::after { width: 100%; }
.nav-links a:not(.nav-cta):hover { color: var(--primary-dark); }

.nav-links a.nav-cta {
  color: #000000;
  font-weight: 800;
  background: var(--primary-soft);
  padding: 10px 22px;
  border-radius: 11px;
  border: 2px solid var(--primary);
  transition: transform var(--transition), background var(--transition);
}

.nav-links a.nav-cta:hover {
  color: #000000;
  background: #C7E594;
  transform: translateY(-1px);
}

.burger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.burger span {
  display: block;
  width: 26px;
  height: 2.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

.burger.active span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* Mobile nav */
.mobile-nav {
  position: fixed;
  inset: 76px 0 0 0;
  background: var(--bg);
  z-index: 99;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(.2,.7,.3,1);
  padding: 40px 28px;
  overflow-y: auto;
}

.mobile-nav.open { transform: translateX(0); }

.mobile-nav ul { list-style: none; display: flex; flex-direction: column; gap: 6px; }

.mobile-nav a {
  display: block;
  padding: 16px 18px;
  font-size: 1.1rem;
  color: var(--text);
  font-family: 'Marcellus', serif;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--card-bg);
}

.mobile-nav a.nav-cta {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
  text-align: center;
  margin-top: 14px;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 700;
}

/* ========== Buttons (B5 A — rounded 10–12px) ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 28px;
  border-radius: 11px;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.99rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform var(--transition), background var(--transition), box-shadow var(--transition), border-color var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(77, 124, 15, 0.28);
}

.btn-primary:hover {
  background: var(--primary-dark);
  color: #FFFFFF;
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(77, 124, 15, 0.36);
}

.btn-secondary {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-secondary:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
}

.btn-lg { padding: 17px 34px; font-size: 1.04rem; }

/* ========== Hero (E — minimalist white, large typography) ========== */
.hero {
  padding: 90px 0 110px;
  background: var(--bg);
  position: relative;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 17px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  border-radius: 30px;
  font-size: 0.84rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 36px;
}

.hero-eyebrow::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
}

.hero h1 {
  max-width: 920px;
  margin-bottom: 32px;
  font-weight: 400;
}

.hero h1 .accent-word {
  color: var(--primary);
  font-style: italic;
}

.hero-desc {
  font-size: 1.18rem;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 44px;
  line-height: 1.66;
}

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

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 32px 44px;
  padding-top: 36px;
  border-top: 1px solid var(--border);
  max-width: 880px;
}

.trust-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.trust-num {
  font-family: 'Marcellus', serif;
  font-size: 2.3rem;
  color: var(--primary);
  line-height: 1;
}

.trust-label {
  font-size: 0.92rem;
  color: var(--text-muted);
  max-width: 180px;
}

/* ========== Sections (A — alternating bg) ========== */
section { padding: 96px 0; }

.section-alt { background: var(--bg-alt); }

.section-head {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 64px;
}

.section-eyebrow {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
  display: block;
}

.section-head h2 { margin-bottom: 18px; }

.section-head p {
  color: var(--text-muted);
  font-size: 1.07rem;
}

/* ========== Stats ========== */
.stats {
  padding: 64px 0;
  background: var(--text);
  color: #fff;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 36px;
  text-align: center;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stat-num {
  font-family: 'Marcellus', serif;
  font-size: 2.7rem;
  color: var(--primary-soft);
  line-height: 1;
}

.stat-label {
  font-size: 0.92rem;
  color: rgba(255, 255, 255, 0.75);
  letter-spacing: 0.04em;
}

/* ========== Features (Cards A — shadow + hover lift) ========== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--card-bg);
  padding: 36px 30px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

.feature-card:hover {
  transform: translateY(-7px);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  width: 56px;
  height: 56px;
  border-radius: 13px;
  background: linear-gradient(135deg, var(--primary-soft) 0%, #B6DD7C 100%);
  display: grid;
  place-items: center;
  margin-bottom: 22px;
  color: var(--primary-dark);
}

.feature-icon svg { width: 28px; height: 28px; }

.feature-card h3 { margin-bottom: 12px; }

.feature-card p {
  color: var(--text-muted);
  font-size: 0.99rem;
}

/* ========== Platforms ========== */
.platforms-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.platform-card {
  background: var(--card-bg);
  padding: 30px 26px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 18px;
  text-decoration: none;
  color: var(--text);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  box-shadow: var(--shadow-sm);
}

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

.platform-icon {
  width: 48px;
  height: 48px;
  border-radius: 11px;
  background: var(--bg-alt);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: var(--accent);
}

.platform-icon svg { width: 24px; height: 24px; }

.platform-card h4 { margin-bottom: 3px; font-family: 'Marcellus', serif; }

.platform-card span {
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* ========== Why Plato — text-rich philosophical ========== */
.why-plato {
  padding: 100px 0;
}

.why-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 70px;
  align-items: start;
}

.why-text h2 {
  margin-bottom: 26px;
}

.why-text > p {
  color: var(--text-muted);
  font-size: 1.06rem;
  margin-bottom: 18px;
  line-height: 1.78;
}

.why-text blockquote {
  margin: 32px 0;
  padding: 22px 28px;
  border-left: 3px solid var(--primary);
  background: var(--bg-alt);
  font-family: 'Marcellus', serif;
  font-size: 1.18rem;
  color: var(--text);
  font-style: italic;
  line-height: 1.5;
}

.principles-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.principle {
  display: flex;
  gap: 20px;
  padding: 22px 24px;
  border-radius: var(--radius);
  background: var(--card-bg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.principle-num {
  font-family: 'Marcellus', serif;
  font-size: 1.85rem;
  color: var(--primary);
  line-height: 1;
  flex-shrink: 0;
  min-width: 38px;
}

.principle h4 { margin-bottom: 6px; font-size: 1.1rem; }

.principle p {
  color: var(--text-muted);
  font-size: 0.96rem;
  line-height: 1.6;
}

/* ========== Use cases ========== */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.usecase {
  background: var(--card-bg);
  padding: 32px 30px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
}

.usecase:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.usecase-tag {
  display: inline-block;
  padding: 4px 11px;
  border-radius: 5px;
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.usecase h3 { margin-bottom: 12px; }

.usecase p {
  color: var(--text-muted);
  font-size: 0.99rem;
  line-height: 1.7;
}

/* ========== Pricing (B — three columns, no real prices) ========== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
  align-items: stretch;
}

.price-card {
  background: var(--card-bg);
  padding: 40px 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition);
}

.price-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
}

.price-card.featured {
  border: 2px solid var(--primary);
  position: relative;
}

.price-card.featured::before {
  content: 'выбор большинства';
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: #fff;
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.price-card h3 { margin-bottom: 8px; }

.price-tag {
  font-family: 'Marcellus', serif;
  font-size: 1.7rem;
  color: var(--accent);
  margin: 14px 0 22px;
  letter-spacing: -0.01em;
}

.price-features {
  list-style: none;
  margin-bottom: 30px;
  flex-grow: 1;
}

.price-features li {
  padding: 11px 0;
  border-bottom: 1px dashed var(--border);
  display: flex;
  gap: 11px;
  align-items: flex-start;
  color: var(--text);
  font-size: 0.97rem;
}

.price-features li:last-child { border-bottom: none; }

.price-features li::before {
  content: '✓';
  color: var(--primary);
  font-weight: 700;
  flex-shrink: 0;
}

/* ========== CTA banner ========== */
.cta-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 60%, #84A845 100%);
  color: #fff;
  padding: 72px 0;
  text-align: center;
}

.cta-banner h2 {
  color: #fff;
  margin-bottom: 16px;
}

.cta-banner p {
  color: rgba(255, 255, 255, 0.92);
  max-width: 620px;
  margin: 0 auto 30px;
  font-size: 1.07rem;
}

.cta-banner .btn-primary {
  background: #fff;
  color: var(--primary-dark);
}

.cta-banner .btn-primary:hover {
  background: var(--bg);
  color: var(--primary-dark);
}

/* ========== FAQ (B — two-column open grid) ========== */
.faq-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
}

.faq-item {
  background: var(--card-bg);
  padding: 28px 30px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.faq-item h3 {
  font-family: 'Marcellus', serif;
  font-size: 1.18rem;
  margin-bottom: 12px;
  color: var(--primary-dark);
}

.faq-item p {
  color: var(--text-muted);
  font-size: 0.97rem;
  line-height: 1.7;
}

/* ========== Footer (C — 3 columns + CTA banner above) ========== */
.site-footer {
  background: #14180A;
  color: #C8D2B8;
  padding: 78px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 56px;
}

.footer-brand .logo-text { color: #fff; }

.footer-brand p {
  color: #8E9C7A;
  margin-top: 16px;
  font-size: 0.95rem;
  line-height: 1.7;
  max-width: 380px;
}

.footer-col h4 {
  color: #fff;
  font-size: 0.92rem;
  font-family: 'IBM Plex Sans', sans-serif;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }

.footer-col a {
  color: #A6B294;
  font-size: 0.95rem;
}

.footer-col a:hover { color: #fff; }

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  color: #6E7A60;
  font-size: 0.87rem;
}

/* ========== Instruktsiya page ========== */
.instr-hero {
  padding: 80px 0 60px;
  text-align: center;
}

.instr-hero h1 { max-width: 820px; margin: 0 auto 22px; }

.instr-hero .hero-desc {
  margin: 0 auto;
  max-width: 640px;
}

.steps {
  padding: 60px 0 80px;
}

.step {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 44px 44px;
  margin-bottom: 26px;
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 32px;
  align-items: start;
}

.step-num {
  font-family: 'Marcellus', serif;
  font-size: 4.2rem;
  color: var(--primary);
  line-height: 1;
}

.step-body h2 { margin-bottom: 14px; font-size: 1.7rem; }

.step-body p {
  color: var(--text-muted);
  margin-bottom: 14px;
  font-size: 1.02rem;
  line-height: 1.7;
}

.step-body .btn { margin-top: 8px; }

.after-pay {
  background: var(--bg-alt);
  padding: 80px 0;
}

.after-pay h2 { text-align: center; margin-bottom: 40px; }

.note-card {
  max-width: 760px;
  margin: 0 auto 48px;
  background: var(--card-bg);
  border-left: 4px solid var(--primary);
  padding: 26px 30px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.note-card p {
  color: var(--text);
  line-height: 1.72;
  font-size: 1.01rem;
}

.note-card p + p { margin-top: 12px; }

/* ========== Animations (A — fade-up) ========== */
.fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.85s cubic-bezier(.2,.7,.3,1), transform 0.85s cubic-bezier(.2,.7,.3,1);
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ========== Responsive ========== */
@media (max-width: 980px) {
  .nav-links { display: none; }
  .burger { display: flex; }
  .hero { padding: 64px 0 80px; }
  .features-grid, .platforms-grid, .pricing-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: 1fr; gap: 44px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
  .faq-grid, .usecases-grid { grid-template-columns: 1fr; }
  section { padding: 70px 0; }
}

@media (max-width: 620px) {
  .container { padding: 0 20px; }
  .hero h1 { font-size: 2.3rem; }
  .features-grid, .platforms-grid, .pricing-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .step { grid-template-columns: 1fr; padding: 32px 26px; gap: 14px; }
  .step-num { font-size: 3rem; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .trust-row { gap: 22px 30px; }
  .trust-num { font-size: 1.9rem; }
}