:root {
    --bg-top: #0d121a;
    --bg-mid: #131c2b;
    --bg-bottom: #1e2c4a;
    --panel: #1c212b;
    --panel-2: #282d38;
    --panel-line: rgba(255, 255, 255, 0.08);
    --ink: #f5f8ff;
    --muted: rgba(226, 235, 255, 0.72);
    --accent-1: #92c7ff;
    --accent-2: #57b3f5;
    --accent-3: #478ce6;
    --accent-soft: rgba(146, 199, 255, 0.12);
    --shadow: 0 24px 70px rgba(0, 0, 0, 0.35);
    --radius-xl: 30px;
    --radius-lg: 24px;
    --radius-md: 18px;
    --max: 1180px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", sans-serif;
    color: var(--ink);
    background:
        radial-gradient(circle at 15% 12%, rgba(146, 199, 255, 0.18), transparent 22%),
        radial-gradient(circle at 88% 14%, rgba(87, 179, 245, 0.18), transparent 20%),
        radial-gradient(circle at 50% 80%, rgba(71, 140, 230, 0.14), transparent 30%),
        linear-gradient(180deg, var(--bg-top) 0%, var(--bg-mid) 42%, var(--bg-bottom) 100%);
    line-height: 1.5;
    min-height: 100vh;
}

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

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

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

p, li, nav a {
    color: var(--muted);
}

.shell {
    width: min(calc(100% - 32px), var(--max));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    backdrop-filter: blur(18px);
    background: rgba(9, 13, 20, 0.46);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.site-header .shell,
.site-footer .shell {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 18px;
}

.site-header .shell {
    padding: 18px 0;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 0.92rem;
    font-weight: 700;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.mark {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    display: block;
    object-fit: contain;
    box-shadow: 0 4px 12px rgba(87, 179, 245, 0.14);
}

.site-nav {
    display: flex;
    gap: 22px;
    align-items: center;
    color: var(--muted);
    font-size: 0.97rem;
}

.site-nav a:hover {
    color: var(--ink);
}

.nav-cta,
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 22px;
    border-radius: 999px;
    font-weight: 700;
    transition: transform 160ms ease, opacity 160ms ease, background 160ms ease, border-color 160ms ease;
}

.nav-cta:hover,
.button:hover,
.howto-link:hover,
.feature-link:hover {
    transform: translateY(-2px);
}

.nav-cta,
.button-primary {
    color: #08111d;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2), var(--accent-3));
    box-shadow: 0 14px 30px rgba(87, 179, 245, 0.24);
}

.button-secondary {
    border: 1px solid rgba(255, 255, 255, 0.10);
    background: rgba(255, 255, 255, 0.04);
    color: var(--ink);
}

.site-main section {
    padding: 42px 0;
}

.site-main section + section {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.card {
    background: linear-gradient(180deg, rgba(29, 34, 43, 0.98), rgba(20, 25, 34, 0.98));
    border: 1px solid var(--panel-line);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
}

.card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    pointer-events: none;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.eyebrow,
.panel-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 14px;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #08111d;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
}

.section-heading {
    margin-bottom: 20px;
    max-width: 64ch;
}

.section-heading p {
    margin-bottom: 0;
}

.hero {
    padding-top: 70px;
}

.hero-grid,
.showcase-grid,
.value-grid,
.trust-grid,
.footer-grid {
    display: grid;
    gap: 24px;
}

.hero-grid {
    grid-template-columns: 1.08fr 0.92fr;
    align-items: stretch;
}

.hero-copy {
    padding: 50px;
}

.hero-copy h1 {
    margin: 24px 0 18px;
    font-size: clamp(2.8rem, 6vw, 5.6rem);
    line-height: 0.92;
    letter-spacing: -0.055em;
    max-width: 10ch;
}

.hero-copy p {
    font-size: 1.08rem;
    max-width: 55ch;
}

.hero-panel {
    padding: 32px;
    background:
        radial-gradient(circle at top right, rgba(146, 199, 255, 0.24), transparent 34%),
        linear-gradient(180deg, rgba(36, 43, 56, 0.98), rgba(21, 27, 36, 0.98));
}

.hero-device-stack {
    display: grid;
    gap: 18px;
    margin-top: 18px;
}

.device-frame {
    padding: 18px;
    min-height: 280px;
    border-radius: 20px;
    border: 1px dashed rgba(146, 199, 255, 0.28);
    background: linear-gradient(180deg, rgba(146, 199, 255, 0.08), rgba(255, 255, 255, 0.02));
    display: flex;
    align-items: center;
    justify-content: center;
}

.device-frame.ipad {
    min-height: 360px;
    padding: 20px;
}

.device-frame img {
    border-radius: 24px;
    border: 1px solid rgba(146, 199, 255, 0.24);
    box-shadow: 0 18px 36px rgba(0, 0, 0, 0.28);
}

.device-frame.iphone img {
    width: 100%;
    max-width: 220px;
}

.device-frame.ipad img {
    width: 100%;
    max-width: 560px;
}

.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin: 28px 0 30px;
}

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

.stat {
    padding: 18px;
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, rgba(146, 199, 255, 0.14), rgba(255, 255, 255, 0.03));
    border: 1px solid rgba(146, 199, 255, 0.14);
}

.stat strong {
    display: block;
    margin-bottom: 4px;
    font-size: 1.35rem;
    color: var(--ink);
}

.trust-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

.trust-card,
.value-card,
.showcase-card,
.final-card {
    padding: 28px;
}

.trust-card {
    background: linear-gradient(180deg, rgba(31, 37, 49, 0.98), rgba(18, 24, 33, 0.98));
}

.trust-card strong {
    display: block;
    margin-bottom: 8px;
    font-size: 1.02rem;
}

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

.showcase-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.showcase-card h3,
.value-card h3 {
    font-size: 1.32rem;
    margin-bottom: 8px;
}

.showcase-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    font-size: 0.86rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
}

.feature-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    color: var(--accent-1);
}

.howto-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
}

.howto-link {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: space-between;
    min-height: 190px;
    padding: 24px;
    border-radius: 26px;
    box-shadow: var(--shadow);
    transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
    background: linear-gradient(180deg, rgba(36, 42, 52, 0.98), rgba(22, 28, 38, 0.98));
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.howto-index {
    display: inline-flex;
    min-width: 42px;
    min-height: 42px;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: var(--accent-soft);
    border: 1px solid rgba(146, 199, 255, 0.18);
    color: var(--accent-1);
    font-weight: 700;
}

.howto-link strong {
    font-size: 1.1rem;
    line-height: 1.32;
    color: var(--ink);
}

.howto-link span:last-child {
    color: var(--muted);
    font-size: 0.95rem;
}

.faq-list {
    display: grid;
    gap: 16px;
}

.faq-item summary {
    list-style: none;
    cursor: pointer;
    padding: 24px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    font-size: 1.08rem;
    font-weight: 700;
    color: var(--ink);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "+";
    flex-shrink: 0;
    font-size: 1.4rem;
    line-height: 1;
    color: var(--accent-1);
}

.faq-item[open] summary::after {
    content: "−";
}

.faq-answer {
    padding: 0 28px 24px;
    color: var(--muted);
    max-width: 70ch;
}

.final-card {
    text-align: center;
}

.final-actions {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.site-footer {
    padding: 28px 0 54px;
    color: var(--muted);
    font-size: 0.94rem;
}

.site-footer .shell {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 24px;
}

.footer-grid {
    grid-template-columns: 1.2fr 0.8fr;
    width: 100%;
}

.footer-links {
    display: flex;
    gap: 18px;
    flex-wrap: wrap;
}

.guide-shell {
    padding: 56px 0 64px;
}

.guide-card {
    padding: 38px;
}

.guide-header {
    max-width: 760px;
    margin-bottom: 28px;
}

.guide-header h1 {
    margin: 22px 0 12px;
    font-size: clamp(2.4rem, 5vw, 4.2rem);
    line-height: 0.96;
    letter-spacing: -0.05em;
}

.guide-header p {
    font-size: 1.05rem;
}

.guide-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.steps {
    display: grid;
    gap: 22px;
    margin-top: 36px;
}

.step {
    padding: 22px;
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--panel-line);
}

.step h2 {
    margin: 0 0 10px;
    font-size: clamp(1.18rem, 2vw, 1.55rem);
    letter-spacing: -0.03em;
    white-space: pre-line;
}

.step p {
    margin: 0 0 18px;
    white-space: pre-line;
}

.step img {
    width: 100%;
    height: auto;
    border-radius: 18px;
    border: 1px solid var(--panel-line);
    background: rgba(255, 255, 255, 0.02);
}

@media (max-width: 980px) {
    .hero-grid,
    .showcase-grid,
    .value-grid,
    .trust-grid,
    .footer-grid {
        grid-template-columns: 1fr;
    }

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

    .site-header .shell,
    .site-footer .shell {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 720px) {
    .site-nav {
        flex-wrap: wrap;
        gap: 12px 18px;
    }

    .hero-copy,
    .hero-panel,
    .trust-card,
    .showcase-card,
    .value-card,
    .final-card,
    .guide-card {
        padding: 24px;
    }

    .stats {
        grid-template-columns: 1fr;
    }

    .hero {
        padding-top: 34px;
    }

    .device-frame {
        min-height: 220px;
    }

    .device-frame.ipad {
        min-height: 280px;
    }

    .howto-grid {
        grid-template-columns: 1fr;
    }

    .howto-link {
        min-height: 150px;
    }
}