:root {
  --bg-primary: #091420;
  --bg-deep: #07111a;
  --header-bg: #122331;
  --footer-bg: #0d1a24;
  --text-primary: #eef5fb;
  --text-secondary: #c9d8e7;
  --text-muted: #95aabd;
  --surface-1: #102333;
  --surface-2: #12283b;
  --surface-3: #18324a;
  --line: rgba(148, 180, 206, 0.23);
  --line-soft: rgba(148, 180, 206, 0.14);
  --accent: #2f9dff;
  --accent-strong: #1f79cf;
  --accent-soft: rgba(47, 157, 255, 0.16);
  --success: #2ad86e;
  --btn-sign-in: #396555;
  --btn-sign-up: #1475e1;
  --header-height: 60px;
  --shadow-soft: 0 16px 34px rgba(2, 9, 15, 0.32);
}

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

html,
body {
  width: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: "Segoe UI", "Trebuchet MS", "Lucida Sans Unicode", Tahoma, sans-serif;
  background:
    radial-gradient(1280px 720px at 8% -18%, rgba(45, 108, 160, 0.25), transparent 63%),
    radial-gradient(980px 620px at 92% -10%, rgba(31, 86, 133, 0.19), transparent 62%),
    linear-gradient(180deg, #081521 0%, #06111a 52%, #071321 100%);
  color: var(--text-primary);
}

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

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--header-bg);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
}

.header-bar {
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand img,
.footer-brand img {
  width: 80px;
  height: 40px;
  object-fit: contain;
}

.header-menu {
  margin-left: auto;
  display: flex;
  align-items: center;
}

.header-actions {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 10px;
  width: 318px;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  color: #ffffff;
  font-weight: 600;
  border-radius: 8px;
  padding: 10px 20px;
}

.sign-in {
  background: var(--btn-sign-in);
}

.sign-up {
  background: var(--btn-sign-up);
}

.menu-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.09);
  cursor: pointer;
  padding: 9px;
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: #ffffff;
}

.menu-toggle span + span {
  margin-top: 6px;
}

/* Body layout */
.page-content {
  flex: 1 0 auto;
  padding: clamp(34px, 6vw, 64px) 0 clamp(52px, 7vw, 84px);
}

.page-content .container {
  width: min(1240px, calc(100% - 40px));
}

.landing-shell {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  gap: var(--section-gap);
  --section-gap: clamp(30px, 4.4vw, 52px);
  --hero-columns: minmax(0, 1.16fr) minmax(250px, 0.84fr);
  --hero-pad: clamp(24px, 3.8vw, 42px);
  --hero-visual-min: 228px;
  --card-border-strong: rgba(166, 196, 219, 0.16);
  --card-border-soft: rgba(166, 196, 219, 0.12);
  --card-bg: linear-gradient(180deg, rgba(16, 30, 44, 0.48), rgba(11, 24, 35, 0.4));
  --step-bg: linear-gradient(180deg, rgba(15, 29, 43, 0.46), rgba(10, 22, 33, 0.38));
  --faq-bg: linear-gradient(180deg, rgba(15, 28, 42, 0.44), rgba(11, 22, 33, 0.35));
  --lp-surface: rgba(15, 29, 43, 0.44);
  --lp-surface-soft: rgba(14, 27, 40, 0.24);
  --lp-surface-strong: rgba(16, 31, 46, 0.84);
  --lp-border: rgba(166, 196, 219, 0.25);
  --lp-border-soft: rgba(166, 196, 219, 0.16);
  --lp-text: #e8f2fa;
  --lp-muted: #b7cadb;
  --lp-faint: #8ea8bd;
  --lp-accent: #35a4ff;
  --lp-accent-strong: #1f7fce;
  --lp-shadow: 0 18px 36px rgba(2, 9, 16, 0.3);
}

.landing-shell.variant-b {
  --lp-accent: #4db3ff;
  --lp-accent-strong: #2a90dd;
  --section-gap: clamp(34px, 4.8vw, 56px);
  --hero-columns: minmax(0, 1.22fr) minmax(230px, 0.78fr);
  --hero-pad: clamp(26px, 4vw, 44px);
  --card-bg: linear-gradient(180deg, rgba(16, 31, 45, 0.42), rgba(11, 24, 35, 0.34));
  --step-bg: linear-gradient(180deg, rgba(16, 31, 45, 0.4), rgba(11, 24, 35, 0.32));
}

.landing-shell.variant-c {
  --lp-accent: #59abff;
  --lp-accent-strong: #307fd1;
  --section-gap: clamp(28px, 4vw, 46px);
  --hero-columns: minmax(0, 1.1fr) minmax(270px, 0.9fr);
  --hero-pad: clamp(23px, 3.5vw, 38px);
  --hero-visual-min: 214px;
  --card-border-strong: rgba(168, 198, 221, 0.19);
  --card-bg: linear-gradient(180deg, rgba(16, 32, 48, 0.5), rgba(10, 22, 33, 0.44));
}

.landing-shell.variant-d {
  --lp-accent: #67a8ff;
  --lp-accent-strong: #3c78c9;
  --section-gap: clamp(32px, 4.2vw, 50px);
  --hero-columns: minmax(0, 1.18fr) minmax(245px, 0.82fr);
  --hero-pad: clamp(24px, 3.6vw, 40px);
  --card-bg: linear-gradient(180deg, rgba(16, 31, 45, 0.45), rgba(10, 22, 33, 0.37));
  --step-bg: linear-gradient(180deg, rgba(16, 31, 45, 0.43), rgba(10, 22, 33, 0.35));
  --faq-bg: linear-gradient(180deg, rgba(15, 28, 42, 0.4), rgba(11, 22, 33, 0.32));
}

.landing-shell section {
  position: relative;
}

.hero-section,
.cta-section {
  border-radius: 22px;
  border: 1px solid var(--lp-border-soft);
  background: linear-gradient(150deg, rgba(17, 35, 50, 0.78), rgba(11, 24, 35, 0.7));
}

.hero-section {
  display: grid;
  grid-template-columns: var(--hero-columns);
  align-items: center;
  gap: clamp(18px, 3vw, 34px);
  padding: var(--hero-pad);
  box-shadow: var(--lp-shadow);
}

.hero-copy {
  max-width: 56ch;
  display: grid;
  gap: 12px;
}

.hero-kicker {
  width: fit-content;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(177, 208, 229, 0.28);
  background: rgba(11, 23, 33, 0.5);
  color: var(--lp-faint);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.hero-copy h1 {
  font-size: clamp(30px, 3.8vw, 50px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  max-width: 560px;
}

.hero-subtitle {
  color: var(--lp-muted);
  font-size: clamp(15px, 1.35vw, 18px);
  line-height: 1.62;
  max-width: 52ch;
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  min-height: 44px;
  padding: 0 18px;
  border-radius: 11px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  transition: transform 0.2s ease, filter 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  filter: brightness(1.04);
}

.btn-primary {
  background: linear-gradient(180deg, var(--lp-accent), var(--lp-accent-strong));
  color: #ffffff;
  border-color: rgba(206, 235, 255, 0.42);
}

.btn-secondary {
  background: rgba(19, 38, 55, 0.68);
  color: #d6e8f8;
  border-color: rgba(148, 182, 207, 0.3);
}

.hero-trust {
  color: var(--lp-faint);
  font-size: 13px;
  line-height: 1.5;
}

.hero-visual {
  min-height: var(--hero-visual-min);
  border-radius: 18px;
  border: 1px solid rgba(166, 196, 219, 0.24);
  padding: clamp(18px, 2vw, 24px);
  display: grid;
  align-content: end;
  gap: 10px;
  overflow: hidden;
  background:
    radial-gradient(180px 140px at 78% 18%, rgba(88, 180, 255, 0.28), transparent 70%),
    radial-gradient(150px 120px at 22% 26%, rgba(76, 223, 170, 0.2), transparent 70%),
    linear-gradient(165deg, #1a3a53, #12293d 70%);
}

.landing-shell.variant-c .hero-visual {
  background:
    radial-gradient(170px 138px at 80% 18%, rgba(95, 196, 255, 0.3), transparent 70%),
    radial-gradient(150px 120px at 20% 24%, rgba(106, 167, 255, 0.18), transparent 70%),
    linear-gradient(164deg, #203a58, #13293c 71%);
}

.landing-shell.variant-d .hero-visual {
  background:
    radial-gradient(160px 130px at 74% 18%, rgba(128, 186, 255, 0.3), transparent 68%),
    radial-gradient(132px 105px at 28% 28%, rgba(72, 213, 186, 0.2), transparent 70%),
    linear-gradient(164deg, #1d3652, #12283a 72%);
}

.hero-visual h3 {
  font-size: 18px;
  line-height: 1.3;
}

.hero-visual p {
  color: #c6d9e8;
  font-size: 14px;
  line-height: 1.55;
}

.hero-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.metric-pill {
  border-radius: 999px;
  border: 1px solid rgba(190, 220, 241, 0.34);
  background: rgba(9, 19, 30, 0.44);
  color: #dfeffd;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 5px 10px;
}

h2 {
  font-size: clamp(23px, 2.5vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

h3 {
  font-size: clamp(18px, 1.7vw, 21px);
  line-height: 1.3;
}

p,
li {
  color: var(--lp-muted);
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.66;
}

.intro-content {
  max-width: 74ch;
  display: grid;
  gap: 14px;
}

.features-section,
.how-section,
.faq-section {
  display: grid;
  gap: 16px;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.feature-card {
  border-radius: 14px;
  border: 1px solid var(--card-border-strong);
  background: var(--card-bg);
  padding: 18px;
  display: grid;
  gap: 9px;
}

.feature-card ul {
  margin-top: 2px;
  padding-left: 18px;
}

.feature-card li + li {
  margin-top: 4px;
}

.how-section {
  padding-top: 4px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.step-card {
  border-radius: 14px;
  border: 1px solid var(--card-border-strong);
  background: var(--step-bg);
  padding: 16px;
  display: grid;
  gap: 8px;
}

.step-index {
  width: 34px;
  height: 24px;
  border-radius: 9px;
  border: 1px solid rgba(178, 210, 233, 0.3);
  background: rgba(23, 47, 68, 0.76);
  color: #d8ecfb;
  font-size: 11px;
  font-weight: 800;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.support-section {
  border-radius: 16px;
  border: 1px solid var(--card-border-soft);
  background: linear-gradient(180deg, rgba(14, 28, 41, 0.36), rgba(11, 22, 33, 0.26));
  padding: clamp(18px, 2.4vw, 26px);
  display: grid;
  gap: 16px;
}

.support-content {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
  align-items: stretch;
}

.support-copy {
  max-width: 66ch;
  display: grid;
  gap: 10px;
}

.support-visual {
  border-radius: 14px;
  border: 1px solid var(--card-border-soft);
  padding: 16px;
  display: grid;
  align-content: end;
  gap: 8px;
  background:
    radial-gradient(130px 100px at 78% 22%, rgba(88, 180, 255, 0.27), transparent 70%),
    linear-gradient(162deg, #1a364f, #112537 72%);
}

.support-visual h3 {
  font-size: 17px;
}

.support-visual p {
  font-size: 14px;
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  border-radius: 13px;
  border: 1px solid var(--card-border-soft);
  background: var(--faq-bg);
  padding: 16px 18px;
}

.faq-item h3 {
  font-size: clamp(17px, 1.45vw, 20px);
  margin-bottom: 7px;
}

.cta-section {
  padding: clamp(24px, 3.7vw, 36px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(16px, 2.2vw, 24px);
  box-shadow: var(--lp-shadow);
}

.cta-copy h2 {
  margin-bottom: 8px;
}

.cta-copy p {
  max-width: 64ch;
}

.site-footer {
  margin-top: auto;
  background: var(--footer-bg);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 40px 0 52px;
}

.footer-inner {
  display: grid;
  gap: 24px;
}

.footer-copy {
  font-size: clamp(18px, 1.4vw, 22px);
  font-weight: 700;
  line-height: 1.2;
}

.footer-text,
.footer-note {
  max-width: 1050px;
  font-size: clamp(16px, 1.2vw, 18px);
  line-height: 1.45;
  color: rgba(255, 255, 255, 0.9);
}

.footer-text a,
.footer-note a,
.footer-links a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: clamp(16px, 1.2vw, 18px);
  font-weight: 600;
}

.footer-social {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-social a {
  width: 56px;
  height: 56px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 10px;
  display: grid;
  place-items: center;
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
}

.footer-social a:last-child {
  font-size: 18px;
  text-transform: uppercase;
}

.footer-age {
  width: 68px;
  height: 68px;
  border-radius: 50%;
  background: #ffffff;
  color: var(--footer-bg);
  display: grid;
  place-items: center;
  font-size: 28px;
  font-weight: 700;
}

@media (max-width: 1140px) {
  .hero-section,
  .support-content {
    grid-template-columns: 1fr;
  }

  .features-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-visual {
    min-height: 200px;
  }

  .cta-section {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 900px) {
  .menu-toggle {
    display: block;
  }

  .header-menu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #162733;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .site-header.is-open .header-menu {
    display: flex;
  }

  .header-actions {
    width: 100%;
  }

  .page-content .container {
    width: min(1240px, calc(100% - 26px));
  }

  .site-footer {
    padding: 28px 0 36px;
  }

  .footer-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-social a {
    width: 48px;
    height: 48px;
    font-size: 21px;
  }

  .footer-social a:last-child {
    font-size: 16px;
  }

  .footer-age {
    width: 60px;
    height: 60px;
    font-size: 24px;
  }

  .footer-text,
  .footer-note {
    font-size: 16px;
  }
}

@media (max-width: 640px) {
  .page-content {
    padding-top: 24px;
    padding-bottom: 40px;
  }

  .landing-shell {
    gap: 22px;
  }

  .hero-section {
    padding: 16px;
    border-radius: 16px;
  }

  .hero-copy {
    gap: 10px;
  }

  .hero-visual {
    min-height: 180px;
    padding: 14px;
    border-radius: 14px;
  }

  .features-grid,
  .steps-grid {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .feature-card,
  .step-card,
  .faq-item {
    padding: 14px;
  }

  .support-section {
    padding: 14px;
    border-radius: 14px;
  }

  .support-visual {
    min-height: 140px;
  }

  .cta-section {
    padding: 16px;
    border-radius: 16px;
  }

  .hero-actions .btn,
  .cta-actions .btn {
    flex: 1 1 100%;
  }
}