/* Korop Development — site styles
   Single-file CSS, mobile-first, system-preference dark mode.
*/

:root {
    --bg: #ffffff;
    --bg-alt: #f5f7fa;
    --fg: #1a1f2e;
    --fg-muted: #5b6478;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --border: #e5e9f0;
    --card: #ffffff;
    --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 12px rgba(15, 23, 42, 0.04);
    --radius: 12px;
    --max-width: 1080px;
    --max-narrow: 720px;
    font-size: 16px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1320;
        --bg-alt: #161b2c;
        --fg: #e5e9f0;
        --fg-muted: #9aa3b8;
        --accent: #92d2ff;
        --accent-hover: #bfe3ff;
        --border: #232a40;
        --card: #161b2c;
        --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 16px rgba(0, 0, 0, 0.25);
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
                 "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.15s ease;
}

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

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.container.narrow {
    max-width: var(--max-narrow);
}

/* ---------- Header / nav ---------- */
.site-header {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: saturate(180%) blur(8px);
    background: color-mix(in oklab, var(--bg) 88%, transparent);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 16px;
    padding-bottom: 16px;
    gap: 16px;
    flex-wrap: wrap;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    color: var(--fg);
    text-decoration: none;
}

.brand:hover, .brand:focus-visible {
    text-decoration: none;
}

.brand-mark {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: var(--fg);
    color: var(--bg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 24px;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--fg-muted);
    font-size: 0.95rem;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
    color: var(--fg);
}

/* ---------- Hero ---------- */
.hero {
    padding: 96px 0 80px;
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--fg-muted);
    margin: 0 0 16px;
}

h1 {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    line-height: 1.1;
    margin: 0 0 24px;
    letter-spacing: -0.02em;
}

.lede {
    font-size: 1.15rem;
    color: var(--fg-muted);
    max-width: 640px;
    margin: 0 0 32px;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 22px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.1s ease, background 0.15s ease, color 0.15s ease,
                border-color 0.15s ease;
}

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

.btn-primary {
    background: var(--fg);
    color: var(--bg);
}

.btn-primary:hover {
    background: var(--accent);
    color: var(--bg);
}

.btn-ghost {
    background: transparent;
    color: var(--fg);
    border-color: var(--border);
}

.btn-ghost:hover {
    border-color: var(--fg);
    color: var(--fg);
}

/* ---------- Sections ---------- */
.section {
    padding: 72px 0;
    border-top: 1px solid var(--border);
}

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

h2 {
    font-size: clamp(1.6rem, 3.2vw, 2.2rem);
    margin: 0 0 24px;
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.25rem;
    margin: 24px 0 8px;
}

h4 {
    font-size: 1.05rem;
    margin: 18px 0 6px;
    color: var(--fg);
}

p {
    margin: 0 0 14px;
}

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

/* ---------- Apps grid ---------- */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.app-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 28px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.app-icon {
    width: 64px;
    height: 64px;
}

.app-body h3 {
    margin: 0 0 6px;
}

.app-tag {
    font-style: italic;
    color: var(--fg-muted);
    margin: 0 0 12px;
}

.app-meta {
    color: var(--fg-muted);
    font-size: 0.85rem;
    margin: 12px 0 4px;
}

.app-status {
    font-weight: 600;
    color: var(--accent);
    margin: 4px 0 0;
}

/* ---------- Legal / Privacy ---------- */
.legal {
    padding: 64px 0 80px;
}

.legal h1 {
    margin-bottom: 8px;
}

.legal h2 {
    margin-top: 40px;
    font-size: 1.4rem;
}

.legal h3 {
    margin-top: 24px;
    font-size: 1.1rem;
}

.legal h4 {
    margin-top: 18px;
    font-size: 1rem;
    color: var(--accent);
}

.legal ul {
    padding-left: 22px;
}

.legal li {
    margin-bottom: 6px;
}

.legal hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 40px 0 24px;
}

/* ---------- Footer ---------- */
.site-footer {
    border-top: 1px solid var(--border);
    background: var(--bg-alt);
    padding: 28px 0;
    margin-top: 40px;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    color: var(--fg-muted);
    font-size: 0.9rem;
}

.footer-inner p {
    margin: 0;
}

.footer-links {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--fg-muted);
}

.footer-links a:hover {
    color: var(--fg);
}

/* ---------- Mobile tweaks ---------- */
@media (max-width: 600px) {
    .hero {
        padding: 56px 0 48px;
    }
    .section {
        padding: 48px 0;
    }
    .nav {
        padding-top: 12px;
        padding-bottom: 12px;
    }
    .nav-links {
        gap: 16px;
        font-size: 0.9rem;
    }
}

/* ---------- Focus / accessibility ---------- */
:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 4px;
}