:root {
  --ink: #123142;
  --muted: #627383;
  --line: #c8e4ef;
  --surface: #ffffff;
  --soft: #f3f9fb;
  --blue: #238fc1;
  --blue-dark: #176b92;
  --green: #217a4b;
  --gold: #b7791f;
  --charcoal: #181a1b;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI Variable Text", "Segoe UI", Arial, sans-serif;
  color: var(--ink);
  background: #f7fbfd;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 72px;
  padding: 14px clamp(20px, 5vw, 72px);
  background: rgba(247, 251, 253, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  margin-right: auto;
}

.brand-logo {
  width: 36px;
  height: 36px;
  object-fit: contain;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 22px;
  color: #3f5a68;
  font-size: 14px;
}

.header-action,
.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 700;
  white-space: nowrap;
}

.header-action,
.primary-button {
  color: #ffffff;
  background: var(--blue);
  border-color: #1477a2;
}

.secondary-button {
  color: var(--blue-dark);
  background: #ffffff;
  border-color: var(--line);
}

.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(520px, 1.1fr);
  gap: clamp(32px, 5vw, 76px);
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: clamp(44px, 7vw, 92px) clamp(20px, 5vw, 72px) 56px;
  background:
    linear-gradient(135deg, rgba(35, 143, 193, 0.12), rgba(33, 122, 75, 0.08) 54%, rgba(183, 121, 31, 0.12)),
    #f7fbfd;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue-dark);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(52px, 7vw, 92px);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.04;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.hero-lead {
  max-width: 600px;
  color: #435c69;
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.45;
}

.hero-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.trust-row span {
  padding: 8px 11px;
  color: #24495a;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 700;
}

.app-preview {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  min-height: 520px;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid #9ed0e3;
  border-radius: 8px;
  box-shadow: 0 24px 70px rgba(18, 49, 66, 0.18);
}

.preview-sidebar {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: center;
  padding-top: 24px;
  background: var(--charcoal);
}

.preview-sidebar span {
  width: 18px;
  height: 18px;
  border-radius: 4px;
  background: #aeb8c2;
}

.preview-window {
  min-width: 0;
  background: #ffffff;
}

.preview-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 72px;
  padding: 16px 20px;
  color: #ffffff;
  background: #2ba2d6;
}

.preview-topbar strong,
.preview-topbar small {
  display: block;
}

.preview-topbar small {
  margin-top: 4px;
  color: #eaf8fe;
}

.preview-topbar button {
  min-height: 34px;
  padding: 0 12px;
  color: var(--ink);
  background: #ffffff;
  border: 0;
  border-radius: 4px;
}

.preview-tabs {
  display: flex;
  gap: 18px;
  padding: 12px 20px 0;
  border-bottom: 1px solid var(--line);
}

.preview-tabs span {
  padding-bottom: 12px;
  color: #637381;
  font-weight: 700;
}

.preview-tabs .active {
  color: var(--blue-dark);
  border-bottom: 3px solid var(--blue);
}

.preview-content {
  display: grid;
  grid-template-columns: 150px minmax(190px, 0.95fr) minmax(210px, 1.05fr);
  gap: 14px;
  padding: 18px;
}

.preview-content aside {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.preview-content aside button {
  min-height: 38px;
  padding: 0 12px;
  text-align: left;
  color: #365462;
  background: #f3f9fb;
  border: 1px solid var(--line);
  border-radius: 5px;
}

.preview-content aside .selected {
  color: #ffffff;
  background: var(--green);
  border-color: #17633b;
}

.search-line {
  height: 38px;
  margin-bottom: 10px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: linear-gradient(90deg, #e7f3f8 36%, #ffffff 36%);
}

.mail-list article {
  min-height: 86px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  margin-bottom: 10px;
  background: #ffffff;
}

.mail-list strong,
.mail-list p,
.date {
  display: block;
}

.mail-list p {
  margin-bottom: 0;
  color: var(--muted);
}

.date {
  margin-bottom: 6px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 700;
}

.reader-pane {
  min-height: 330px;
  padding: 18px;
  background: #f8fcfd;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.reader-chip {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 7px 10px;
  color: #17633b;
  background: #e6f4ed;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 800;
}

.reader-pane h2 {
  font-size: 24px;
  line-height: 1.15;
}

.reader-pane p {
  color: var(--muted);
  line-height: 1.6;
}

.attachment-row {
  display: flex;
  gap: 10px;
  margin-top: 28px;
}

.attachment-row span {
  width: 86px;
  height: 34px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 5px;
}

.section,
.download-section,
.site-footer {
  padding: clamp(48px, 7vw, 92px) clamp(20px, 5vw, 72px);
}

.section-heading {
  max-width: 780px;
  margin-bottom: 32px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.feature-grid article {
  padding: 22px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.feature-grid p,
.license-section p {
  color: var(--muted);
  line-height: 1.6;
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 32px;
  margin-bottom: 18px;
  color: #ffffff;
  background: var(--blue);
  border-radius: 5px;
  font-weight: 800;
}

.security-section {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1.15fr);
  gap: clamp(28px, 5vw, 72px);
  background: #ffffff;
}

.security-copy p {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}

.security-list {
  display: grid;
  gap: 12px;
}

.security-list div {
  display: grid;
  gap: 6px;
  padding: 18px;
  background: var(--soft);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.security-list span {
  color: var(--muted);
}

.workflow-section {
  background: #f7fbfd;
}

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

.workflow div {
  min-height: 160px;
  padding: 22px;
  background: #123142;
  color: #ffffff;
  border-radius: 8px;
}

.workflow span {
  display: block;
  margin-bottom: 30px;
  color: #9bdaf2;
  font-size: 34px;
  font-weight: 800;
}

.workflow p {
  margin-bottom: 0;
  line-height: 1.5;
}

.license-section,
.download-section {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(300px, 1.1fr);
  gap: clamp(24px, 5vw, 72px);
  align-items: center;
  background: #ffffff;
}

.download-section {
  background: linear-gradient(135deg, #123142, #176b92 58%, #217a4b);
  color: #ffffff;
}

.download-section .eyebrow {
  color: #9bdaf2;
}

.download-section h2 {
  max-width: 760px;
}

.download-section .secondary-button {
  color: #ffffff;
  background: transparent;
  border-color: rgba(255, 255, 255, 0.42);
}

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-top: 24px;
  padding-bottom: 24px;
  color: #536b78;
  border-top: 1px solid var(--line);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  font-weight: 700;
}

.legal-hero {
  padding: clamp(56px, 8vw, 104px) clamp(20px, 5vw, 72px) clamp(34px, 5vw, 64px);
  background:
    linear-gradient(135deg, rgba(35, 143, 193, 0.14), rgba(33, 122, 75, 0.08)),
    #f7fbfd;
  border-bottom: 1px solid var(--line);
}

.legal-hero h1 {
  max-width: 900px;
  margin-bottom: 14px;
  font-size: clamp(44px, 7vw, 78px);
}

.legal-hero p:last-child {
  margin-bottom: 0;
  color: var(--muted);
  font-weight: 700;
}

.legal-content {
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(36px, 6vw, 72px) 20px;
}

.legal-content section {
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.legal-content section:first-child {
  padding-top: 0;
}

.legal-content section:last-child {
  border-bottom: 0;
}

.legal-content h2 {
  margin-bottom: 12px;
  font-size: clamp(24px, 3vw, 34px);
}

.legal-content p {
  color: #4d6470;
  line-height: 1.72;
}

.legal-content p:last-child {
  margin-bottom: 0;
}

.legal-content code {
  padding: 2px 5px;
  color: #17465b;
  background: #effaff;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92em;
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .hero-section,
  .security-section,
  .license-section,
  .download-section {
    grid-template-columns: 1fr;
  }

  .app-preview {
    min-height: auto;
  }

  .preview-content {
    grid-template-columns: 1fr;
  }

  .preview-content aside {
    flex-direction: row;
    overflow-x: auto;
  }

  .preview-content aside button {
    min-width: 110px;
  }

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

@media (max-width: 640px) {
  .site-header {
    gap: 12px;
  }

  .brand span {
    display: none;
  }

  .header-action {
    min-height: 38px;
    padding: 0 12px;
  }

  .hero-section {
    padding-top: 34px;
  }

  .app-preview {
    grid-template-columns: 34px minmax(0, 1fr);
    border-radius: 6px;
  }

  .preview-sidebar {
    gap: 14px;
  }

  .preview-sidebar span {
    width: 14px;
    height: 14px;
  }

  .preview-topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .preview-tabs {
    gap: 12px;
    overflow-x: auto;
  }

  .feature-grid,
  .workflow {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
  }
}