:root {
  --htu-primary: #2563eb;
  --htu-primary-dark: #1d4ed8;
  --htu-accent: #f59e0b;
  --htu-success: #10b981;
  --htu-bg: #f5f8fc;
  --htu-surface: #ffffff;
  --htu-surface-soft: #eef5ff;
  --htu-text: #0f172a;
  --htu-muted: #60728a;
  --htu-border: #dce7f3;
  --htu-shadow: 0 16px 45px rgba(15, 23, 42, 0.09);
  --htu-radius: 8px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--htu-bg);
  color: var(--htu-text);
  font-family: Inter, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}

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

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

a:hover {
  color: var(--htu-primary-dark);
}

.htu-container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.htu-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--htu-border);
  backdrop-filter: blur(14px);
}

.htu-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  gap: 24px;
}

.htu-logo img {
  display: block;
  width: 150px;
}

.htu-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.htu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 18px;
  border-radius: var(--htu-radius);
  border: 1px solid transparent;
  font-weight: 800;
  line-height: 1;
  white-space: nowrap;
}

.htu-btn--primary {
  background: var(--htu-primary);
  color: #fff;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.25);
}

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

.htu-btn--ghost {
  background: #fff;
  color: var(--htu-primary);
  border-color: var(--htu-border);
}

.htu-hero {
  padding: 58px 0 48px;
  background:
    radial-gradient(circle at 80% 20%, rgba(37, 99, 235, 0.12), transparent 34%),
    linear-gradient(135deg, #eef7ff 0%, #f7fbff 54%, #fff7ed 100%);
  border-bottom: 1px solid var(--htu-border);
}

.htu-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 48px;
  align-items: center;
}

.htu-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  padding: 8px 14px;
  border: 1px solid rgba(37, 99, 235, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--htu-primary);
  font-size: 14px;
  font-weight: 800;
}

.htu-hero h1 {
  margin: 0 0 16px;
  font-size: clamp(34px, 4.4vw, 56px);
  line-height: 1.05;
  letter-spacing: 0;
}

.htu-hero p {
  max-width: 720px;
  margin: 0 0 24px;
  color: var(--htu-muted);
  font-size: 18px;
}

.htu-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.htu-hero__badges span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--htu-border);
  color: var(--htu-muted);
  font-size: 14px;
  font-weight: 700;
}

.htu-hero__visual {
  padding: 0;
  border-radius: var(--htu-radius);
  background: transparent;
  border: 0;
  box-shadow: none;
}

.htu-hero__visual img {
  display: block;
  margin: 0 auto;
  max-height: 260px;
  object-fit: contain;
  filter: drop-shadow(0 18px 30px rgba(15, 23, 42, 0.16));
}

.htu-layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 32px;
  padding: 42px 0 64px;
}

.htu-sidebar {
  position: sticky;
  top: 96px;
  align-self: start;
  padding: 18px;
  border-radius: var(--htu-radius);
  background: #fff;
  border: 1px solid var(--htu-border);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.06);
}

.htu-sidebar h2 {
  margin: 0 0 14px;
  font-size: 16px;
}

.htu-sidebar a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--htu-radius);
  color: var(--htu-muted);
  font-weight: 750;
}

.htu-sidebar a:hover,
.htu-sidebar a.is-active {
  background: var(--htu-surface-soft);
  color: var(--htu-primary);
}

.htu-content {
  display: grid;
  gap: 28px;
}

.htu-section {
  scroll-margin-top: 96px;
  padding: 30px;
  border-radius: var(--htu-radius);
  background: #fff;
  border: 1px solid var(--htu-border);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.05);
}

.htu-section h2 {
  margin: 0 0 12px;
  font-size: clamp(26px, 3vw, 34px);
  line-height: 1.2;
}

.htu-section h3 {
  margin: 28px 0 10px;
  font-size: 22px;
}

.htu-section p {
  color: var(--htu-muted);
}

.htu-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 20px;
}

.htu-card {
  padding: 18px;
  border-radius: var(--htu-radius);
  background: var(--htu-surface-soft);
  border: 1px solid var(--htu-border);
}

.htu-card strong {
  display: block;
  margin-bottom: 6px;
  color: var(--htu-text);
}

.htu-list {
  margin: 14px 0 0;
  padding-left: 22px;
  color: var(--htu-muted);
}

.htu-list li + li {
  margin-top: 8px;
}

.htu-alert {
  display: flex;
  gap: 12px;
  margin: 18px 0;
  padding: 16px;
  border-radius: var(--htu-radius);
  background: #fff7ed;
  border: 1px solid #fed7aa;
  color: #9a4b00;
}

.htu-alert strong {
  color: #7c2d12;
}

.htu-steps {
  display: grid;
  gap: 20px;
  margin-top: 18px;
}

.htu-step {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 18px;
  padding: 20px;
  border-radius: var(--htu-radius);
  border: 1px solid var(--htu-border);
  background: #fbfdff;
}

.htu-step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background: var(--htu-primary);
  color: #fff;
  font-size: 18px;
  font-weight: 900;
}

.htu-step h4 {
  margin: 0 0 8px;
  font-size: 19px;
}

.htu-step p {
  margin-top: 0;
}

.htu-shot {
  margin-top: 14px;
  overflow: hidden;
  border: 1px solid var(--htu-border);
  border-radius: var(--htu-radius);
  background: #fff;
}

.htu-shot button {
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: zoom-in;
}

.htu-shot img {
  display: block;
  width: 100%;
}

.htu-shot figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--htu-border);
  color: var(--htu-muted);
  font-size: 14px;
}

.htu-video {
  overflow: hidden;
  margin-top: 18px;
  border-radius: var(--htu-radius);
  border: 1px solid var(--htu-border);
  background: #000;
  aspect-ratio: 16 / 9;
}

.htu-video iframe {
  width: 100%;
  height: 100%;
  border: 0;
}

.htu-footer {
  padding: 26px 0;
  background: #0f172a;
  color: #dbeafe;
  text-align: center;
}

.htu-lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 32px;
  background: rgba(15, 23, 42, 0.82);
}

.htu-lightbox.is-open {
  display: flex;
}

.htu-lightbox img {
  max-width: min(1100px, 96vw);
  max-height: 86vh;
  border-radius: var(--htu-radius);
  background: #fff;
  box-shadow: var(--htu-shadow);
}

.htu-lightbox button {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  background: #fff;
  color: var(--htu-text);
  font-size: 24px;
  cursor: pointer;
}

@media (max-width: 991px) {
  .htu-hero__grid,
  .htu-layout {
    grid-template-columns: 1fr;
  }

  .htu-sidebar {
    position: static;
  }

  .htu-card-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .htu-header__inner,
  .htu-header__actions,
  .htu-hero__badges {
    align-items: stretch;
    flex-direction: column;
  }

  .htu-header__actions .htu-btn,
  .htu-btn {
    width: 100%;
  }

  .htu-step {
    grid-template-columns: 1fr;
  }

  .htu-section {
    padding: 22px;
  }
}