/* ============================================================================
 *  WebExpress landing page styles
 *  - Mobile-first, responsive, accessible
 *  - GDPR-friendly: system fonts only, no @import of external stylesheets,
 *    no remote URLs, no external trackers.
 * ============================================================================ */

/* --- design tokens ---------------------------------------------------------- */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-accent: #0ea5e9;
    --color-bg: #ffffff;
    --color-surface: #f8fafc;
    --color-surface-2: #eef2f7;
    --color-text: #0f172a;
    --color-text-muted: #475569;
    --color-border: #e2e8f0;
    --color-code-bg: #0f172a;
    --color-code-text: #e2e8f0;

    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 18px;

    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06), 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 6px 18px rgba(15, 23, 42, 0.08);

    --transition: 180ms ease-out;

    --container-max: 1100px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #0b1220;
        --color-surface: #111a2e;
        --color-surface-2: #14223d;
        --color-text: #e2e8f0;
        --color-text-muted: #94a3b8;
        --color-border: #1f2a44;
        --color-primary: #60a5fa;
        --color-primary-dark: #93c5fd;
        --color-accent: #38bdf8;
    }
}

/* --- reset & base ----------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

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

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover,
a:focus-visible {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

h1, h2, h3, h4 {
    line-height: 1.2;
    margin: 0 0 0.5em;
    color: var(--color-text);
}

p {
    margin: 0 0 1em;
}

code, pre {
    font-family: var(--font-mono);
    font-size: 0.92em;
}

code {
    background: var(--color-surface-2);
    color: var(--color-text);
    padding: 0.1em 0.35em;
    border-radius: var(--radius-sm);
}

pre {
    background: var(--color-code-bg);
    color: var(--color-code-text);
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius-md);
    overflow-x: auto;
    box-shadow: var(--shadow-sm);
}

pre code {
    background: transparent;
    color: inherit;
    padding: 0;
}

/* --- utilities -------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding-inline: 1.25rem;
}

.visually-hidden {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border: 0;
}

.skip-link {
    position: absolute;
    inset-inline-start: 1rem;
    top: -3rem;
    background: var(--color-primary);
    color: #fff;
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    z-index: 1000;
    transition: top var(--transition);
}

.skip-link:focus-visible {
    top: 1rem;
    color: #fff;
    text-decoration: none;
}

.muted {
    color: var(--color-text-muted);
}

.small {
    font-size: 0.875rem;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--color-primary);
    margin: 0 0 0.5rem;
}

/* --- header ----------------------------------------------------------------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--color-bg) 88%, transparent);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 64px;
    gap: 1.5rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.brand:hover,
.brand:focus-visible {
    color: var(--color-text);
    text-decoration: none;
}

.brand__name {
    font-size: 1.1rem;
}

.brand--footer .brand__name {
    font-size: 1rem;
}

.site-nav {
    display: flex;
    align-items: center;
}

.site-nav__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.site-nav__list a {
    display: inline-block;
    padding: 0.5rem 0.85rem;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-weight: 500;
    font-size: 0.95rem;
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
    background: var(--color-surface);
    color: var(--color-primary-dark);
    text-decoration: none;
}

.site-nav__toggle {
    display: none;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    width: 40px; height: 40px;
    cursor: pointer;
    padding: 0;
    align-items: center;
    justify-content: center;
    color: var(--color-text);
}

.site-nav__icon,
.site-nav__icon::before,
.site-nav__icon::after {
    display: block;
    width: 18px; height: 2px;
    background: currentColor;
    border-radius: 2px;
    position: relative;
}
.site-nav__icon::before,
.site-nav__icon::after {
    content: "";
    position: absolute;
    inset-inline-start: 0;
}
.site-nav__icon::before { top: -6px; }
.site-nav__icon::after  { top:  6px; }

@media (max-width: 720px) {
    .site-nav__toggle {
        display: inline-flex;
    }
    .site-nav__list {
        position: absolute;
        inset-inline: 0;
        top: 64px;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 0.75rem 1.25rem 1rem;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        display: none;
    }
    .site-nav__list[data-open="true"] {
        display: flex;
    }
    .site-nav__list a {
        padding: 0.75rem 0.5rem;
        border-radius: 0;
        border-bottom: 1px solid var(--color-border);
    }
    .site-nav__list li:last-child a {
        border-bottom: none;
    }
}

/* --- buttons ---------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.97rem;
    line-height: 1;
    border: 1px solid transparent;
    cursor: pointer;
    transition: transform var(--transition), background var(--transition), border-color var(--transition), color var(--transition), box-shadow var(--transition);
    text-decoration: none;
}

.btn:hover,
.btn:focus-visible {
    text-decoration: none;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

.btn--primary {
    background: var(--color-primary);
    color: #ffffff;
    box-shadow: var(--shadow-sm);
}
.btn--primary:hover,
.btn--primary:focus-visible {
    background: var(--color-primary-dark);
    color: #ffffff;
    box-shadow: var(--shadow-md);
}

.btn--ghost {
    background: transparent;
    border-color: var(--color-border);
    color: var(--color-text);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
    border-color: var(--color-primary);
    color: var(--color-primary-dark);
    background: var(--color-surface);
}

/* --- hero ------------------------------------------------------------------- */
.hero {
    position: relative;
    overflow: hidden;
    padding-block: clamp(3rem, 8vw, 6rem);
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
    border-bottom: 1px solid var(--color-border);
}

.hero__bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.hero__svg {
    width: 100%;
    height: 100%;
}

.hero__inner {
    position: relative;
    z-index: 1;
    max-width: 820px;
}

.hero__title {
    font-size: clamp(2rem, 4.5vw, 3.25rem);
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

.hero__lead {
    font-size: clamp(1.05rem, 1.4vw, 1.2rem);
    color: var(--color-text-muted);
    max-width: 65ch;
    margin-bottom: 2rem;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2.25rem;
}

.hero__highlights {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.6rem 1.5rem;
    color: var(--color-text-muted);
    font-size: 0.97rem;
}

.hero__highlights li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* --- sections --------------------------------------------------------------- */
.section {
    padding-block: clamp(2.5rem, 7vw, 5rem);
}

.section--alt {
    background: var(--color-surface);
    border-block: 1px solid var(--color-border);
}

.section__header {
    max-width: 720px;
    margin-bottom: 2rem;
}

.section__header h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    letter-spacing: -0.015em;
}

.section__lead {
    color: var(--color-text-muted);
    font-size: 1.05rem;
    margin: 0;
}

.section__footnote {
    margin-top: 1.5rem;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* --- cards ------------------------------------------------------------------ */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.25rem;
}

.cards--two {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    max-width: 920px;
}

.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.section--alt .card {
    background: var(--color-bg);
}

.card:hover,
.card:focus-within {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: color-mix(in srgb, var(--color-primary) 35%, var(--color-border));
}

.card__title {
    margin: 0 0 0.5rem;
    font-size: 1.2rem;
}

.link-list,
.bullet-list {
    margin: 1rem 0 0;
    padding-inline-start: 1.1rem;
}

.link-list {
    list-style: "→  ";
}

.link-list li,
.bullet-list li {
    margin-bottom: 0.35rem;
}

.bullet-list {
    list-style: disc;
}

/* --- code snippet ----------------------------------------------------------- */
.snippet {
    margin-top: 2rem;
}

.snippet__caption {
    color: var(--color-text-muted);
    font-size: 0.92rem;
    margin: 0 0 0.5rem;
}

/* --- legal grid ------------------------------------------------------------- */
.legal-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
}

.legal-box {
    padding: 1.25rem 1.4rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
}

.legal-box h3 {
    margin: 0 0 0.4rem;
    font-size: 1.02rem;
}

.legal-box p {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* --- footer ----------------------------------------------------------------- */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding-block: 2.5rem 1.5rem;
}

.site-footer__inner {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem 2rem;
    margin-bottom: 1.5rem;
}

.site-footer__col h4 {
    font-size: 0.92rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-text-muted);
    margin: 0 0 0.6rem;
}

.site-footer__col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.site-footer__col li {
    margin-bottom: 0.35rem;
}

.site-footer__col a {
    color: var(--color-text);
}

.site-footer__col a:hover,
.site-footer__col a:focus-visible {
    color: var(--color-primary-dark);
}

.site-footer__meta {
    border-top: 1px solid var(--color-border);
    padding-top: 1rem;
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* --- contact ---------------------------------------------------------------- */
.contact-mail {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    word-break: break-all;
}

/* --- legal page ------------------------------------------------------------- */
.legal-page {
    padding-block: clamp(2rem, 5vw, 3.5rem);
}

.legal-page h1 {
    font-size: clamp(1.7rem, 3vw, 2.25rem);
    letter-spacing: -0.015em;
}

.legal-page h2 {
    margin-top: 2rem;
    font-size: 1.2rem;
}

.legal-page p {
    max-width: 70ch;
}

.back-link {
    margin-top: 2.5rem;
}

/* --- 404 page --------------------------------------------------------------- */
.error-body {
    display: flex;
    align-items: center;
    min-height: 100vh;
}

.error-page {
    width: 100%;
}

.error-page__inner {
    text-align: center;
    padding-block: 4rem;
}

.error-page__inner h1 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    margin-bottom: 1rem;
}

.error-page__inner .btn {
    margin: 0.3rem;
}

/* --- motion preferences ----------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}