:root {
    --bg: #eef6fb;
    --surface: #f7fbfe;
    --surface-strong: #ffffff;
    --ink: #335b66;
    --ink-soft: #5f7f87;
    --primary: #1f6f78;
    --secondary: #f28a6b;
    --line: #b9d5df;
    --line-strong: #8db3bf;
    --highlight: #ffe3d7;
    --radius-lg: 24px;
    --radius-md: 18px;
    --radius-sm: 12px;
    --shadow: 0 18px 40px rgba(63, 108, 120, 0.10);
    --wrap: 1180px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--ink);
    background: linear-gradient(180deg, #f4f9fd 0%, #eef6fb 100%);
}
a {
    color: inherit;
    text-decoration: none;
}
a:hover { color: var(--primary); }
img { max-width: 100%; }
:focus-visible {
    outline: 3px solid var(--secondary);
    outline-offset: 2px;
}
.page-shell {
    min-height: 100vh;
}
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(8px);
    background: rgba(247, 251, 254, 0.94);
    border-bottom: 1px solid rgba(141, 179, 191, 0.55);
}
.header-inner,
.section-wrap,
.footer-inner {
    width: min(calc(100% - 32px), var(--wrap));
    margin: 0 auto;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    padding: 18px 0;
}
.brand {
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.brand-mark {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.brand-mark::before {
    content: "";
    display: inline-block;
    width: 38px;
    height: 14px;
    border-radius: 999px;
    background:
        linear-gradient(90deg, var(--secondary) 0 32%, transparent 32% 37%, var(--primary) 37% 69%, transparent 69% 74%, var(--line-strong) 74% 100%);
}
.brand small {
    color: var(--ink-soft);
    font-size: 13px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.nav-toggle {
    display: none;
    border: 1px solid var(--line-strong);
    background: var(--surface-strong);
    color: var(--primary);
    border-radius: 12px;
    padding: 11px 14px;
    font-size: 15px;
    font-weight: 700;
}
.site-nav ul {
    display: flex;
    align-items: center;
    gap: 10px;
    list-style: none;
    padding: 0;
    margin: 0;
}
.site-nav a {
    display: inline-flex;
    align-items: center;
    min-height: 44px;
    padding: 0 16px;
    border-radius: 999px;
    border: 1px solid transparent;
    font-size: 15px;
    font-weight: 700;
}
.site-nav a:hover,
.site-nav a:focus-visible {
    border-color: var(--line-strong);
    background: rgba(255, 255, 255, 0.9);
}
.site-nav .nav-cta {
    background: var(--primary);
    color: #fff;
}
.site-nav .nav-cta:hover,
.site-nav .nav-cta:focus-visible {
    background: var(--secondary);
    color: #fff;
    border-color: var(--secondary);
}
.hero {
    padding: 48px 0 26px;
}
.hero-card {
    background:
        linear-gradient(135deg, rgba(242, 138, 107, 0.12), transparent 40%),
        linear-gradient(180deg, rgba(255, 255, 255, 0.96) 0%, rgba(247, 251, 254, 0.96) 100%);
    border: 1px solid rgba(141, 179, 191, 0.55);
    border-radius: 32px;
    box-shadow: var(--shadow);
    padding: 34px;
    display: grid;
    grid-template-columns: minmax(0, 1.7fr) minmax(240px, 0.9fr);
    gap: 28px;
    align-items: start;
}
.hero-copy > span,
.ribbon-label,
.aside-note strong,
.stage-code,
.compact-code {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    min-height: 34px;
    padding: 0 14px;
    border-radius: 999px;
    background: rgba(31, 111, 120, 0.08);
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}
.hero-copy h1,
h1 {
    margin: 18px 0 16px;
    font-size: 40px;
    line-height: 1.12;
    letter-spacing: -0.03em;
    color: var(--primary);
}
h2 {
    margin: 0 0 16px;
    font-size: 28px;
    line-height: 1.2;
    color: var(--primary);
}
h3 {
    margin: 0 0 12px;
    font-size: 20px;
    line-height: 1.3;
    color: var(--primary);
}
p,
li,
a,
button,
input,
textarea,
label {
    font-size: 16px;
    line-height: 1.72;
}
p {
    margin: 0 0 16px;
    color: var(--ink);
}
.hero-actions,
.inline-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
}
.button-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 18px;
    border-radius: 14px;
    border: 1px solid var(--primary);
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}
.button-link:hover,
.button-link:focus-visible {
    background: var(--secondary);
    border-color: var(--secondary);
    color: #fff;
    transform: translateY(-1px);
}
.button-link.ghost {
    background: rgba(255, 255, 255, 0.8);
    color: var(--primary);
}
.button-link.ghost:hover,
.button-link.ghost:focus-visible {
    color: #fff;
}
.hero-board {
    display: grid;
    gap: 14px;
}
.board-line,
.aside-card,
.ribbon-panel,
.device-card,
.footer-note,
.grid-block,
.contact-panel,
.feature-line {
    background: var(--surface-strong);
    border: 1px solid rgba(141, 179, 191, 0.65);
    border-radius: 22px;
    box-shadow: 0 12px 28px rgba(87, 128, 139, 0.08);
}
.board-line {
    padding: 16px 18px;
}
.board-line + .board-line {
    position: relative;
}
.board-line + .board-line::before {
    content: "";
    position: absolute;
    left: 18px;
    right: 18px;
    top: -8px;
    border-top: 2px dashed rgba(141, 179, 191, 0.75);
}
.board-line span {
    display: block;
    color: var(--ink-soft);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 6px;
}
.board-line p:last-child,
.aside-card p:last-child,
.ribbon-panel p:last-child,
.device-card p:last-child,
.grid-block p:last-child,
.footer-note p:last-child,
.contact-panel p:last-child,
.feature-line p:last-child { margin-bottom: 0; }
.section {
    padding: 26px 0;
}
.split-band {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(260px, 1fr);
    gap: 24px;
    align-items: start;
}
.main-band,
.aside-stack,
.full-band,
.grid-layout,
.contact-layout,
.dual-ribbons {
    display: grid;
    gap: 18px;
}
.main-band > article,
.full-band > article,
.grid-block,
.contact-panel,
.footer-note {
    padding: 28px;
}
.aside-stack {
    position: relative;
}
.aside-card {
    padding: 22px;
}
.aside-card + .aside-card {
    border-top-left-radius: 14px;
}
.aside-note {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.aside-note strong { width: fit-content; }
.aside-note p { margin: 0; }
.ribbon-collection {
    display: grid;
    gap: 18px;
}
.ribbon-panel {
    padding: 26px 28px;
    display: grid;
    gap: 14px;
}
.dual-ribbons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}
.device-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}
.device-card {
    padding: 24px;
    display: grid;
    gap: 12px;
}
.device-card ul,
.grid-block ul,
.contact-panel ul,
.footer-note ul,
.ribbon-panel ul,
.main-band ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 10px;
}
.device-card li,
.grid-block li,
.contact-panel li,
.footer-note li,
.ribbon-panel li,
.main-band li {
    position: relative;
    padding-left: 18px;
}
.device-card li::before,
.grid-block li::before,
.contact-panel li::before,
.footer-note li::before,
.ribbon-panel li::before,
.main-band li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 11px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--secondary);
}
.grid-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}
.feature-line {
    padding: 24px 28px;
    display: grid;
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
}
.contact-layout {
    grid-template-columns: minmax(0, 1.35fr) minmax(260px, 0.9fr);
}
.compact-note {
    color: var(--ink-soft);
    font-size: 14px;
    line-height: 1.65;
}
.site-footer {
    padding: 34px 0 44px;
}
.footer-inner {
    display: grid;
    gap: 16px;
}
.footer-note {
    padding: 24px 28px;
}
.footer-note small {
    display: block;
    font-size: 14px;
    line-height: 1.65;
    color: var(--ink-soft);
}
@media (max-width: 1080px) {
    .hero-card,
    .split-band,
    .contact-layout,
    .dual-ribbons,
    .device-grid,
    .grid-layout,
    .feature-line {
        grid-template-columns: 1fr;
    }
    .hero { padding-top: 34px; }
    .feature-line { gap: 12px; }
}
@media (max-width: 880px) {
    .nav-toggle { display: inline-flex; }
    .header-inner { align-items: flex-start; }
    .site-nav { width: 100%; display: none; }
    .site-nav.open { display: block; }
    .site-nav ul { flex-direction: column; align-items: stretch; padding-top: 10px; }
    .site-nav a { justify-content: center; }
    .header-inner { flex-wrap: wrap; }
}
@media (max-width: 640px) {
    .header-inner,
    .section-wrap,
    .footer-inner { width: min(calc(100% - 24px), var(--wrap)); }
    .hero-card,
    .main-band > article,
    .full-band > article,
    .grid-block,
    .contact-panel,
    .footer-note,
    .aside-card,
    .ribbon-panel,
    .device-card,
    .feature-line { padding: 22px; }
    .hero-copy h1,
    h1 { margin-top: 16px; }
}