/* ---------------------------------------------------------------------
   USPVPN — Design tokens
--------------------------------------------------------------------- */
:root {
  --font-display: "Sora", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-pill: 999px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 64px;
  --space-8: 96px;

  --container-max: 1140px;
  --transition-fast: 180ms cubic-bezier(.4,0,.2,1);
  --transition-med: 320ms cubic-bezier(.4,0,.2,1);

  --gradient-brand: linear-gradient(120deg, #6D5BFF 0%, #4338CA 45%, #0EA5B7 100%);
  --gradient-brand-soft: linear-gradient(120deg, rgba(109,91,255,0.14), rgba(14,165,183,0.10));
}

/* ---------------------------------------------------------------------
   Theme: light (default)
--------------------------------------------------------------------- */
:root,
html[data-theme="light"] {
  color-scheme: light;

  --color-primary: #4F3EE0;
  --color-primary-dark: #3A2BB8;
  --color-primary-soft: #EFEDFF;
  --color-accent: #0EA5B7;

  --color-ink: #11132A;
  --color-body: #444866;
  --color-muted: #6E7290;
  --color-border: #E7E8F3;
  --color-border-strong: #D6D8EE;

  --color-bg: #FCFBFF;
  --color-surface: #FFFFFF;
  --color-surface-muted: #F5F5FC;
  --color-header-bg: rgba(255, 255, 255, 0.78);

  --shadow-sm: 0 1px 2px rgba(20, 22, 60, 0.06);
  --shadow-md: 0 16px 36px rgba(40, 33, 110, 0.10);
  --shadow-lg: 0 28px 60px rgba(40, 33, 110, 0.16);

  --glow-1: rgba(109, 91, 255, 0.30);
  --glow-2: rgba(14, 165, 183, 0.22);
  --glow-3: rgba(255, 119, 198, 0.18);
}

/* ---------------------------------------------------------------------
   Theme: dark
--------------------------------------------------------------------- */
html[data-theme="dark"] {
  color-scheme: dark;

  --color-primary: #8B7CFF;
  --color-primary-dark: #A296FF;
  --color-primary-soft: rgba(139, 124, 255, 0.16);
  --color-accent: #34D6E8;

  --color-ink: #F3F4FC;
  --color-body: #C2C5E0;
  --color-muted: #8B8FB8;
  --color-border: rgba(255, 255, 255, 0.09);
  --color-border-strong: rgba(255, 255, 255, 0.16);

  --color-bg: #0A0B16;
  --color-surface: #12132A;
  --color-surface-muted: #15172F;
  --color-header-bg: rgba(10, 11, 22, 0.72);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 16px 36px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 28px 70px rgba(0, 0, 0, 0.55);

  --glow-1: rgba(139, 124, 255, 0.35);
  --glow-2: rgba(52, 214, 232, 0.22);
  --glow-3: rgba(255, 119, 198, 0.16);
}

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

html, body { margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-body);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition-med), color var(--transition-med);
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover { text-decoration: underline; }

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--color-ink);
  font-weight: 700;
  line-height: 1.15;
  margin: 0;
}

p { margin: 0; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-ink);
  color: var(--color-bg);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  z-index: 1000;
}

.skip-link:focus {
  left: var(--space-3);
  top: var(--space-3);
}

/* ---------------------------------------------------------------------
   Layout helpers
--------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

.section {
  padding: var(--space-8) 0;
  position: relative;
}

.section-muted {
  background: var(--color-surface-muted);
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section-tag::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-brand);
}

.section h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  max-width: 700px;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.section-lead {
  max-width: 640px;
  color: var(--color-body);
  font-size: 17px;
}

.meta-note {
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: var(--space-5);
}

/* ---------------------------------------------------------------------
   Header
--------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-header-bg);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-med), border-color var(--transition-med);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: 76px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  color: var(--color-ink);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.logo:hover { text-decoration: none; }

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.main-nav a {
  position: relative;
  color: var(--color-body);
  font-weight: 500;
  font-size: 15px;
  padding: 6px 2px;
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  background: var(--gradient-brand);
  border-radius: 2px;
  transition: right var(--transition-fast);
}

.main-nav a:hover {
  color: var(--color-ink);
  text-decoration: none;
}

.main-nav a:hover::after { right: 0; }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.lang-switch,
.theme-switch {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  height: 38px;
  padding: 0 12px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-muted);
  letter-spacing: 0.02em;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.lang-switch:hover,
.theme-switch:hover {
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.theme-switch {
  width: 38px;
  padding: 0;
  position: relative;
  color: var(--color-ink);
}

.theme-icon {
  position: absolute;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.theme-icon-sun { opacity: 1; transform: scale(1) rotate(0deg); }
.theme-icon-moon { opacity: 0; transform: scale(0.5) rotate(-40deg); }

html[data-theme="dark"] .theme-icon-sun { opacity: 0; transform: scale(0.5) rotate(40deg); }
html[data-theme="dark"] .theme-icon-moon { opacity: 1; transform: scale(1) rotate(0deg); }

.lang-divider {
  color: var(--color-border-strong);
}

.lang-option {
  padding: 2px 5px;
  border-radius: 6px;
  transition: background var(--transition-fast), color var(--transition-fast);
}

html[lang="ru"] .lang-option[data-lang-option="ru"],
html[lang="en"] .lang-option[data-lang-option="en"] {
  background: var(--gradient-brand);
  color: #fff;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-ink);
}

.main-nav-mobile {
  display: none;
  flex-direction: column;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.main-nav-mobile a {
  padding: var(--space-3) var(--space-4);
  color: var(--color-body);
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
}

.main-nav-mobile.open { display: flex; }

/* ---------------------------------------------------------------------
   Hero
--------------------------------------------------------------------- */
.hero {
  position: relative;
  padding: var(--space-8) 0 calc(var(--space-8) + var(--space-4));
  overflow: hidden;
}

.hero-glow {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  opacity: 0.9;
  animation: drift 16s ease-in-out infinite alternate;
}

.glow-1 {
  width: 480px;
  height: 480px;
  top: -180px;
  left: -120px;
  background: var(--glow-1);
}

.glow-2 {
  width: 420px;
  height: 420px;
  top: -80px;
  right: -140px;
  background: var(--glow-2);
  animation-delay: -4s;
}

.glow-3 {
  width: 360px;
  height: 360px;
  bottom: -220px;
  left: 40%;
  background: var(--glow-3);
  animation-delay: -8s;
}

@keyframes drift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(30px, 24px) scale(1.08); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
  text-align: center;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-primary);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gradient-brand);
}

.hero h1 {
  font-size: clamp(34px, 5.4vw, 58px);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  font-size: 18px;
  color: var(--color-body);
  max-width: 600px;
  margin-bottom: var(--space-5);
}

.hero-actions {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
}

/* ---------------------------------------------------------------------
   Buttons
--------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 30px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 15px;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast);
}

.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--gradient-brand);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-ghost {
  background: var(--color-surface);
  color: var(--color-ink);
  border: 1px solid var(--color-border);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* ---------------------------------------------------------------------
   Cards
--------------------------------------------------------------------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-med), transform var(--transition-med), border-color var(--transition-med);
}

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

.card-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  background: var(--gradient-brand);
  color: #fff;
  margin-bottom: var(--space-3);
  box-shadow: var(--shadow-sm);
}

.card h3 {
  font-size: 18px;
  margin-bottom: var(--space-2);
}

.card p {
  color: var(--color-muted);
  font-size: 15px;
}

/* ---------------------------------------------------------------------
   Info rows (Support / Contact)
--------------------------------------------------------------------- */
.info-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-5);
  margin-top: var(--space-5);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.info-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.info-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.contact-item:hover {
  border-color: var(--color-border-strong);
  transform: translateY(-2px);
}

/* ---------------------------------------------------------------------
   Privacy policy
--------------------------------------------------------------------- */
.policy-block {
  max-width: 720px;
  margin-bottom: var(--space-5);
  padding-left: var(--space-4);
  border-left: 2px solid var(--color-border);
}

.policy-block h3 {
  font-size: 17px;
  margin-bottom: var(--space-2);
}

.policy-block p {
  color: var(--color-body);
}

/* ---------------------------------------------------------------------
   Footer
--------------------------------------------------------------------- */
.site-footer {
  background: var(--color-ink);
  color: rgba(255, 255, 255, 0.65);
  padding: var(--space-5) 0;
}

html[data-theme="dark"] .site-footer {
  background: #06070F;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  text-align: center;
  font-size: 14px;
}

.footer-sep { color: rgba(255, 255, 255, 0.25); }

/* ---------------------------------------------------------------------
   Responsive
--------------------------------------------------------------------- */
@media (max-width: 860px) {
  .main-nav { display: none; }

  .nav-toggle { display: inline-flex; }
}

@media (max-width: 600px) {
  .section { padding: var(--space-7) 0; }

  .hero { padding: var(--space-7) 0 var(--space-7); }

  .header-actions { gap: var(--space-1); }

  .lang-switch { padding: 0 10px; }

  .glow { filter: blur(40px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}