:root {
    --color-white: #ffffff;
    --color-white-rgb: 255, 255, 255;
    --color-dark: #001B3D;
    --color-dark-rgb: 0, 27, 61;

    --color-bg: var(--color-white);
    --color-text: var(--color-dark);
    --color-text-rgb: var(--color-dark-rgb);

    --color-btn-bg: var(--color-dark);
    --color-btn-text: var(--color-white);
    --color-btn-text-rgb: var(--color-white-rgb);

    --color-secondary-bg: #d2e5fd;
    --color-secondary-text: #004aad;
    --color-secondary-text-rgb: 0, 74, 173;

    --page-width: 1120px;
    --radius-sm: 10px;
    --radius-md: 18px;
    --shadow: 0 18px 45px rgba(0, 27, 61, .08);
}

html[data-theme="dark"] {
    --color-bg: var(--color-dark);
    --color-text: var(--color-white);
    --color-text-rgb: var(--color-white-rgb);

    --color-btn-bg: var(--color-white);
    --color-btn-text: var(--color-dark);
    --color-btn-text-rgb: var(--color-dark-rgb);

    --color-secondary-bg: rgba(210, 229, 253, .14);
    --color-secondary-text: #80a5d6;
    --color-secondary-text-rgb: 128, 165, 214;

    --shadow: 0 18px 45px rgba(0, 0, 0, .24);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-width: 320px;
    background: var(--color-bg);
    color: var(--color-text);
    font-family:
        Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
        Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.65;
    transition: background-color .2s ease, color .2s ease;
}

a {
    color: var(--color-secondary-text);
    text-underline-offset: .18em;
}

a:hover {
    text-decoration-thickness: 2px;
}

button,
a.button {
    font: inherit;
}

.skip-link {
    position: absolute;
    left: 1rem;
    top: -5rem;
    z-index: 100;
    padding: .75rem 1rem;
    background: var(--color-btn-bg);
    color: var(--color-btn-text);
    border-radius: var(--radius-sm);
}

.skip-link:focus {
    top: 1rem;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid rgba(var(--color-text-rgb), .12);
    background: rgba(var(--color-white-rgb), .94);
    backdrop-filter: blur(14px);
}

html[data-theme="dark"] .site-header {
    background: rgba(var(--color-dark-rgb), .94);
}

.header-inner,
main,
.footer-inner {
    width: min(calc(100% - 2rem), var(--page-width));
    margin-inline: auto;
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.brand {
    color: var(--color-text);
    text-decoration: none;
    font-weight: 800;
    letter-spacing: -.02em;
    font-size: 1.08rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: .5rem;
}

.language-link,
.theme-toggle {
    display: inline-flex;
    min-height: 42px;
    align-items: center;
    justify-content: center;
    border: 1px solid rgba(var(--color-text-rgb), .22);
    border-radius: 999px;
    padding: .45rem .8rem;
    background: transparent;
    color: var(--color-text);
    cursor: pointer;
    text-decoration: none;
}

.language-link:hover,
.theme-toggle:hover {
    background: var(--color-secondary-bg);
}

.theme-toggle {
    width: 42px;
    padding: 0;
}

main {
    padding-block: clamp(2.5rem, 6vw, 5rem);
}

.hero {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, .6fr);
    gap: clamp(1.5rem, 4vw, 3.5rem);
    align-items: center;
    padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.eyebrow {
    margin: 0 0 .75rem;
    color: var(--color-secondary-text);
    font-weight: 800;
    letter-spacing: .08em;
    text-transform: uppercase;
    font-size: .82rem;
}

h1,
h2,
h3 {
    line-height: 1.15;
    letter-spacing: -.035em;
}

h1 {
    max-width: 13ch;
    margin: 0;
    font-size: clamp(2.7rem, 7vw, 5.4rem);
}

h2 {
    margin: 0 0 1rem;
    font-size: clamp(1.9rem, 4vw, 3rem);
}

h3 {
    margin-top: 0;
    font-size: 1.2rem;
}

.lead {
    max-width: 66ch;
    margin: 1.25rem 0 0;
    font-size: clamp(1.05rem, 2vw, 1.24rem);
    color: rgba(var(--color-text-rgb), .78);
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin-top: 1.75rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    border: 1px solid var(--color-btn-bg);
    border-radius: 999px;
    padding: .65rem 1.1rem;
    background: var(--color-btn-bg);
    color: var(--color-btn-text);
    font-weight: 750;
    text-decoration: none;
}

.button.secondary {
    background: transparent;
    color: var(--color-text);
    border-color: rgba(var(--color-text-rgb), .3);
}

.button:hover {
    transform: translateY(-1px);
}

.hero-card {
    border: 1px solid rgba(var(--color-text-rgb), .12);
    border-radius: var(--radius-md);
    padding: 1.35rem;
    background: var(--color-secondary-bg);
    box-shadow: var(--shadow);
}

.hero-card p:last-child {
    margin-bottom: 0;
}

.section {
    padding-block: clamp(2.5rem, 6vw, 4.5rem);
    border-top: 1px solid rgba(var(--color-text-rgb), .12);
}

.section-intro {
    max-width: 68ch;
    margin-top: -.25rem;
    color: rgba(var(--color-text-rgb), .74);
}

.grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
    margin-top: 1.75rem;
}

.card {
    border: 1px solid rgba(var(--color-text-rgb), .14);
    border-radius: var(--radius-md);
    padding: 1.35rem;
    background: var(--color-bg);
}

.card.accent {
    background: var(--color-secondary-bg);
}

.card ul,
.checklist {
    margin-bottom: 0;
    padding-left: 1.2rem;
}

.steps {
    counter-reset: step;
    display: grid;
    gap: .9rem;
    margin-top: 1.5rem;
}

.step {
    position: relative;
    padding: 1rem 1rem 1rem 4rem;
    border: 1px solid rgba(var(--color-text-rgb), .14);
    border-radius: var(--radius-sm);
}

.step::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 1rem;
    top: 1rem;
    width: 2rem;
    height: 2rem;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--color-btn-bg);
    color: var(--color-btn-text);
    font-weight: 800;
}

.faq {
    display: grid;
    gap: .75rem;
    margin-top: 1.5rem;
}

details {
    border: 1px solid rgba(var(--color-text-rgb), .14);
    border-radius: var(--radius-sm);
    padding: 0 1rem;
}

summary {
    cursor: pointer;
    font-weight: 760;
    padding: 1rem 2rem 1rem 0;
}

details > div {
    padding: 0 0 1rem;
    color: rgba(var(--color-text-rgb), .78);
}

.notice {
    border-left: 4px solid var(--color-secondary-text);
    padding: 1rem 1.1rem;
    background: var(--color-secondary-bg);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(240px, .7fr);
    gap: 1rem;
    margin-top: 1.5rem;
}

.contact-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.contact-list li + li {
    margin-top: .65rem;
}

.small {
    font-size: .93rem;
    color: rgba(var(--color-text-rgb), .68);
}

.site-footer {
    border-top: 1px solid rgba(var(--color-text-rgb), .12);
}

.footer-inner {
    padding-block: 2rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: .75rem 1.5rem;
    font-size: .93rem;
    color: rgba(var(--color-text-rgb), .68);
}

.footer-inner p {
    margin: 0;
}

kbd {
    border: 1px solid rgba(var(--color-text-rgb), .2);
    border-bottom-width: 2px;
    border-radius: 5px;
    padding: .08rem .35rem;
    background: var(--color-secondary-bg);
    font: inherit;
    font-size: .92em;
    font-weight: 750;
}

@media (max-width: 780px) {
    .hero,
    .contact-grid,
    .grid {
        grid-template-columns: 1fr;
    }

    h1 {
        max-width: none;
    }

    .hero-card {
        box-shadow: none;
    }
}

@media (max-width: 520px) {
    .header-inner {
        min-height: 64px;
    }

    .language-link {
        padding-inline: .65rem;
    }

    main {
        padding-top: 2.25rem;
    }

    .actions {
        display: grid;
    }

    .button {
        width: 100%;
    }

    .footer-inner {
        display: block;
    }

    .footer-inner p + p {
        margin-top: .5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition: none !important;
    }
}