:root {
    --color-text: #333333;
    --color-text-muted: #888888;
    --color-border: #dddddd;
    --color-bg-subtle: #fafafa;
    --color-footer-bg: #333333;
    --color-footer-text: #dddddd;
    --color-accent: #00acec;
    --color-accent-deep: #006690;
    --color-success: #5aa56d;
    --color-success-bg: #e8f8ec;
    --color-error: #e59063;
    --color-error-bg: #fff3d6;
    --space-2xs: 0.25rem;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: clamp(2.5rem, 1.887rem + 3.07vw, 4.34rem);
    --space-xl: clamp(2.5em, 2em + 2.5vw, 4em);
    --content-max-width: 960px;
    --content-gutter: 2rem;
    --transition-fast: 0.15s ease;
    --font-size-base: 1.125rem;
    --font-size-h1: clamp(1.8em, 1.358em + 2.21vw, 3.125em);
    --font-size-h2: clamp(1.08em, 0.815em + 1.325vw, 1.875em);
    color-scheme: light;
}

*, *::before, *::after {
    box-sizing: border-box;
}


/* Body */
body {
    font-family: system-ui, sans-serif;
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin: 0;
}

.page {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
    min-height: 100vh;
    padding-top: clamp(1.25em, 1.167em + 0.42vw, 1.5em);
}

::selection {
    background-color: var(--color-accent-deep);
    color: #ffffff;
}


/* Menu header */
header.menu {
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--content-gutter);
    max-width: var(--content-max-width);
}

header.menu nav {
    align-items: center;
    display: flex;
    justify-content: space-between;
}

header.menu nav .nav-bar {
    align-items: center;
    display: flex;
    position: relative;
}

header.menu nav a.logo {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-deep));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    -webkit-text-fill-color: transparent;
    font-size: 2em;
    font-weight: 800;
    letter-spacing: -0.03em;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

header.menu nav a.logo:hover {
    opacity: 0.85;
}

header.menu nav .nav-links {
    align-items: center;
    display: flex;
    gap: 1.5em;
}

header.menu nav .nav-link {
    color: initial;
    font-weight: 600;
    text-decoration: none;
    transition: color var(--transition-fast);
}

header.menu nav .nav-link:hover {
    color: var(--color-accent-deep);
}

header.menu nav .dropdown {
    position: relative;
}

header.menu nav .dropdown summary {
    cursor: pointer;
    list-style: none;
}

header.menu nav .dropdown summary::-webkit-details-marker {
    display: none;
}

header.menu nav .dropdown summary::after {
    content: "";
    display: inline-block;
    width: 0.4em;
    height: 0.4em;
    margin-left: 0.4em;
    margin-bottom: 0.2em;
    border-right: 0.15em solid currentColor;
    border-bottom: 0.15em solid currentColor;
    transform: rotate(45deg);
    transition: transform var(--transition-fast);
    vertical-align: middle;
}

header.menu nav .dropdown[open] summary::after {
    margin-bottom: 0;
    transform: rotate(225deg);
}

header.menu nav .dropdown ul {
    background-color: #ffffff;
    border: 1px solid var(--color-border);
    border-radius: 0.5em;
    box-shadow: 0 0.75em 2em rgba(0, 0, 0, 0.12);
    list-style: none;
    margin: 0.75em 0 0;
    min-width: 320px;
    padding: 0.5em;
    position: absolute;
    right: 0;
    top: 100%;
    z-index: 10;
}

header.menu nav .dropdown ul li a {
    align-items: center;
    border-radius: 0.35em;
    color: initial;
    display: flex;
    gap: 1em;
    justify-content: space-between;
    padding: 0.75em 1em;
    text-decoration: none;
    transition: background-color var(--transition-fast);
}

header.menu nav .dropdown ul li a:hover {
    background-color: var(--color-bg-subtle);
}

header.menu nav .dropdown .item-text {
    display: flex;
    flex-direction: column;
    gap: 0.2em;
}

header.menu nav .dropdown .item-title {
    color: var(--color-text);
    font-weight: 600;
    transition: color var(--transition-fast);
}

header.menu nav .dropdown ul li a:hover .item-title {
    color: var(--color-accent-deep);
}

header.menu nav .dropdown .item-desc {
    color: var(--color-text-muted);
    font-size: 0.85em;
    font-weight: 300;
}

header.menu nav .dropdown .item-arrow {
    color: var(--color-accent-deep);
    flex-shrink: 0;
    opacity: 0;
    transform: translateX(-0.4em);
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

header.menu nav .dropdown ul li a:hover .item-arrow {
    opacity: 1;
    transform: translateX(0);
}

.nav-toggle,
.nav-toggle-label {
    display: none;
}

@media (max-width: 600px) {
    :root {
        --content-gutter: 1.25rem;
    }

    header.menu nav {
        flex-wrap: wrap;
    }

    header.menu nav .nav-bar {
        width: 100%;
    }

    .nav-toggle {
        cursor: pointer;
        display: block;
        height: 2.2em;
        margin: 0;
        opacity: 0;
        position: absolute;
        right: 0;
        top: 0;
        width: 2.2em;
        z-index: 2;
    }

    .nav-toggle-label {
        display: block;
        height: 1.1em;
        pointer-events: none;
        position: absolute;
        right: 0.5em;
        top: 50%;
        transform: translateY(-50%);
        width: 1.6em;
    }

    .nav-toggle-label span,
    .nav-toggle-label span::before,
    .nav-toggle-label span::after {
        background-color: var(--color-text);
        border-radius: 2px;
        content: "";
        display: block;
        height: 2px;
        position: absolute;
        transition: transform var(--transition-fast), opacity var(--transition-fast), top var(--transition-fast);
        width: 100%;
    }

    .nav-toggle-label span {
        top: 50%;
        transform: translateY(-50%);
    }

    .nav-toggle-label span::before {
        top: -0.55em;
    }

    .nav-toggle-label span::after {
        top: 0.55em;
    }

    .nav-toggle:checked ~ .nav-toggle-label span {
        background-color: transparent;
    }

    .nav-toggle:checked ~ .nav-toggle-label span::before {
        top: 0;
        transform: rotate(45deg);
    }

    .nav-toggle:checked ~ .nav-toggle-label span::after {
        top: 0;
        transform: rotate(-45deg);
    }

    header.menu nav .nav-links {
        align-items: stretch;
        display: none;
        flex-basis: 100%;
        flex-direction: column;
        gap: 0;
        margin-top: var(--space-md);
    }

    header.menu nav:has(.nav-toggle:checked) .nav-links {
        display: flex;
    }

    header.menu nav .nav-link {
        border-top: 1px solid var(--color-border);
        padding: 0.85em 0;
    }

    header.menu nav .dropdown ul {
        background-color: transparent;
        border: none;
        box-shadow: none;
        margin: 0;
        min-width: 0;
        padding: 0 0 0 1em;
        position: static;
    }

    header.menu nav .dropdown ul li a {
        padding: 0.6em 0;
    }

    header.menu nav .dropdown .item-desc,
    header.menu nav .dropdown .item-arrow {
        display: none;
    }
}


/* Main */
main {
    flex: 1;
    width: 100%;
    margin: 0 auto;
    padding: 0 var(--content-gutter);
    max-width: var(--content-max-width);
}

main h1, main h2 {
    letter-spacing: -0.04em;
}

main h1 {
    font-size: var(--font-size-h1);
    line-height: 1.15;
    margin: 0 0 var(--space-lg) 0;
    text-align: center;
}

main h2 {
    font-size: var(--font-size-h2);
    line-height: 1.25;
    margin: var(--space-lg) 0 var(--space-md) 0;
}

main p, main ul {
    font-weight: 300;
}

main p {
    margin: 0 0 var(--space-md) 0;
}

main strong {
    font-weight: 600;
}

main a {
    color: var(--color-accent-deep);
    text-decoration: underline;
    text-underline-offset: 0.15em;
    transition: color var(--transition-fast);
}

main a:hover {
    color: var(--color-accent);
}

main p.subtitle {
    color: var(--color-accent-deep);
    font-size: clamp(1.1em, 1em + 0.5vw, 1.4em);
    font-weight: 400;
    margin: 0 auto var(--space-lg) auto;
    max-width: 38em;
    text-align: center;
}

main ul {
    margin: 0 0 var(--space-md) 0;
    padding-left: 1.25em;
}

main ul li {
    margin-bottom: var(--space-xs);
}

main ul li:last-child {
    margin-bottom: 0;
}


/* Approach pages */
.subfeature {
    margin-top: var(--space-lg);
}

.next-step {
    border-top: 1px solid var(--color-border);
    margin: var(--space-lg) 0 0 0;
    padding-top: var(--space-md);
}

.subfeature h2 {
    font-size: var(--font-size-h2);
    font-weight: 600;
    letter-spacing: normal;
    margin: 0.25em 0 var(--space-md) 0;
}

ul.checklist {
    list-style: none;
    padding-left: 1em;
}

ul.checklist li {
    padding-left: 1.5em;
    position: relative;
}

ul.checklist li::before {
    content: "✓";
    color: var(--color-accent-deep);
    font-weight: 700;
    position: absolute;
    left: 0;
}


/* Footer */
footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: clamp(1.25em, 1.167em + 0.42vw, 1.5em) 0;
}

footer .footer-inner {
    margin: 0 auto;
    padding: 0 var(--content-gutter);
    max-width: var(--content-max-width);
}

footer .footer-line {
    align-items: center;
    display: flex;
}

footer ul {
    font-size: 0.8em;
    margin: 0;
    padding: 0;
}

footer .copyright {
    color: rgba(221, 221, 221, 0.7);
    font-size: 0.75em;
    margin: 0.5em 0 0 0;
}

footer ul li {
    display: inline;
    list-style-type: none;
}

footer ul li + li {
    padding-left: 1em;
}

footer ul li a, footer .lang-switch a {
    color: inherit;
    text-decoration: none;
}

footer ul li a {
    transition: color var(--transition-fast);
}

footer ul li a:hover, footer .lang-switch a:hover {
    color: #ffffff;
}

footer .lang-switch {
    font-size: 0.8em;
    margin-left: auto;
}

footer .lang-switch a {
    background-color: rgba(255, 255, 255, 0.18);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 0.35em;
    display: inline-block;
    padding: 0.25em 0.6em;
    transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
    white-space: nowrap;
}

footer .lang-switch a:hover {
    background-color: rgba(255, 255, 255, 0.24);
    border-color: #ffffff;
}

footer .lang-switch a:active {
    background-color: rgba(255, 255, 255, 0.32);
}

footer .lang-icon-wrap {
    display: inline-flex;
    align-items: center;
    height: 1em;
    height: 1lh;
    margin-right: 0.4em;
    vertical-align: top;
}

footer .lang-icon {
    height: 1em;
    width: 1em;
}

@media (max-width: 600px) {
    footer .footer-line {
        align-items: baseline;
    }

    footer ul li {
        display: block;
    }

    footer ul li + li {
        margin-top: 0.4em;
        padding-left: 0;
    }
}


/* Messages */
ul.messages {
    font-weight: 300;
    margin: var(--space-sm) 0;
    padding: 0;
}

ul.messages li {
    align-items: center;
    border-radius: 0.25em;
    display: flex;
    padding: 0.75em;
}

ul.messages li .symbol {
    align-items: center;
    border-radius: 50%;
    color: #ffffff;
    display: inline-flex;
    flex-shrink: 0;
    font-weight: bold;
    justify-content: center;
    margin-right: 0.5em;
    height: 1.5em;
    width: 1.5em;
}

ul.messages li.success {
    background-color: var(--color-success-bg);
}

ul.messages li.success .symbol {
    background-color: var(--color-success);
}

ul.messages li.error {
    background-color: var(--color-error-bg);
}

ul.messages li.error .symbol {
    background-color: var(--color-error);
}


/* Form */
form label {
    display: block;
    font-size: var(--font-size-h2);
    font-weight: 600;
    letter-spacing: -0.04em;
    line-height: 1.25;
    margin: 0 0 var(--space-sm) 0;
}

form input[type="email"], form textarea {
    background-color: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: 0.25em;
    color: var(--color-text-muted);
    font-family: inherit;
    font-size: 1em;
    padding: 0.75em;
    transition: border-color var(--transition-fast);
}

form input[type="email"]:focus, form textarea:focus {
    outline: none;
    border-color: transparent;
    background-image: linear-gradient(var(--color-bg-subtle), var(--color-bg-subtle)), linear-gradient(135deg, var(--color-accent), var(--color-accent-deep));
    background-origin: border-box;
    background-clip: padding-box, border-box;
}

form input[type="email"].error, form textarea.error {
    border-color: var(--color-error);
}

form textarea {
    height: 14em;
    width: 100%;
}

form input[type="email"] {
    width: 100%;
    max-width: 300px;
}

form .field-section {
    margin: var(--space-sm) 0 var(--space-lg) 0;
}

form button {
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-deep));
    border: none;
    border-radius: 0.25em;
    cursor: pointer;
    color: #ffffff;
    font-family: inherit;
    font-size: 1em;
    padding: 0.75em;
    transition: filter var(--transition-fast);
}

form button:hover {
    filter: brightness(0.92);
}

form button:active {
    filter: brightness(0.85);
}