/*
 * Katselin.fi
 * Yksinkertainen, kevyt ja pitkäikäinen tyylitiedosto.
 * Ei ulkoisia fontteja, ei kuvia (paitsi semanttiset img-elementit),
 * ei animaatioita. Suunniteltu mobiili edellä ja luettavaksi
 * sekä ihmisille että koneille.
 */

:root {
    --bg: #000000;
    --surface: #0a1118;
    --surface-2: #121b25;
    --border: #1c2a38;
    --text: #e8edf2;
    --text-muted: #98a4b3;
    --link: #4ea1ff;
    --link-hover: #7fbcff;
    --brand: #1a5f9e;
    --brand-strong: #2a7ac4;
    --focus: #ffd166;
    --max-width: 900px;
    --gutter: 1.25rem;
}

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

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    background: var(--bg);
    color: var(--text);
    font-size: 17px;
    line-height: 1.6;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
    font-weight: 400;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

/* ---------- Yleinen layout ---------- */

.page {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--gutter);
    width: 100%;
}

main {
    flex: 1 0 auto;
    padding-top: 1rem;
    padding-bottom: 4rem;
}

/* ---------- Yläpalkki ---------- */

.site-header {
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
}

.site-header .page {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem 1.25rem;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
    letter-spacing: 0.01em;
    font-size: 1.05rem;
}

.brand:hover,
.brand:focus-visible {
    color: var(--link-hover);
}

.brand-mark {
    width: 32px;
    height: 32px;
    display: inline-block;
    flex: 0 0 auto;
}

.nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1.1rem;
    align-items: center;
    margin-left: auto;
}

.nav a {
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.35rem 0;
    font-size: 0.98rem;
}

.nav a:hover,
.nav a:focus-visible {
    color: var(--text);
}

.nav a[aria-current="page"] {
    color: var(--text);
    border-bottom: 2px solid var(--brand-strong);
}

.lang {
    display: inline-flex;
    gap: 0.4rem;
    font-size: 0.95rem;
    color: var(--text-muted);
    padding-left: 0.75rem;
    border-left: 1px solid var(--border);
}

.lang a {
    color: var(--text-muted);
    text-decoration: none;
}

.lang a[aria-current="true"] {
    color: var(--text);
    font-weight: 600;
}

.lang a:hover,
.lang a:focus-visible {
    color: var(--text);
}

/* ---------- Etusivun "hero" ---------- */

.hero {
    text-align: center;
    padding: 2.5rem 0 1.5rem;
}

.hero-logo {
    display: block;
    margin: 0 auto 1.25rem;
    width: 180px;
    height: auto;
    max-width: 60%;
}

.hero h1 {
    font-size: 2.4rem;
    margin: 0.25rem 0 0.75rem;
    letter-spacing: -0.01em;
}

.hero .tagline {
    color: var(--text-muted);
    font-size: 1.15rem;
    margin: 0 auto 2rem;
    max-width: 36ch;
}

.cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.4rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    min-width: 10rem;
    text-align: center;
}

.btn:hover,
.btn:focus-visible {
    background: var(--surface-2);
    border-color: var(--brand-strong);
    color: #ffffff;
}

.btn-primary {
    background: var(--brand);
    border-color: var(--brand);
    color: #ffffff;
}

.btn-primary:hover,
.btn-primary:focus-visible {
    background: var(--brand-strong);
    border-color: var(--brand-strong);
}

/* ---------- Tekstiä sisältävät sivut ---------- */

h1,
h2,
h3,
h4 {
    color: var(--text);
    line-height: 1.25;
    font-weight: 700;
}

h1 {
    font-size: 2rem;
    margin-top: 1.5rem;
}

h2 {
    font-size: 1.4rem;
    margin-top: 2.5rem;
    padding-top: 0.5rem;
}

h3 {
    font-size: 1.15rem;
    margin-top: 2rem;
}

p {
    margin: 0 0 1rem;
}

a {
    color: var(--link);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
}

a:hover,
a:focus-visible {
    color: var(--link-hover);
}

ul,
ol {
    padding-left: 1.25rem;
    margin: 0 0 1rem;
}

li {
    margin-bottom: 0.35rem;
}

hr {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 3rem 0;
}

blockquote {
    margin: 1.5rem 0;
    padding: 0.75rem 1rem;
    border-left: 3px solid var(--brand-strong);
    background: var(--surface);
    color: var(--text-muted);
}

code,
pre,
kbd,
samp {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas,
        "Liberation Mono", monospace;
    font-size: 0.95em;
}

code {
    background: var(--surface);
    padding: 0.1em 0.35em;
    border-radius: 3px;
    color: #d8e1eb;
}

pre {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    line-height: 1.45;
}

pre code {
    background: none;
    padding: 0;
}

/* ---------- Kortit ja ruudukot ---------- */

.cards {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin: 1.5rem 0;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.25rem;
}

.card h2,
.card h3 {
    margin-top: 0;
}

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

.card a.btn {
    margin-top: 0.5rem;
    min-width: auto;
}

/* ---------- Sanasto-taulukko ---------- */

table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25rem 0 2rem;
    font-size: 0.97rem;
}

th,
td {
    text-align: left;
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

th {
    color: var(--text);
    font-weight: 600;
}

td:first-child {
    white-space: nowrap;
    color: var(--text);
    font-weight: 500;
}

/* ---------- Alapalkki ---------- */

.site-footer {
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 1.5rem 0 2rem;
}

.site-footer .page {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-tagline {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    justify-content: space-between;
}

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

.site-footer a:hover,
.site-footer a:focus-visible {
    color: var(--text);
}

/* ---------- Dokumentaation sivuvalikko ---------- */

.doc-nav {
    margin: 0 0 2rem;
    padding: 1rem 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.doc-nav h2 {
    margin: 0 0 0.75rem;
    font-size: 1rem;
    font-weight: 600;
}

.doc-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.doc-nav li {
    margin-bottom: 0.35rem;
}

.doc-nav li:last-child {
    margin-bottom: 0;
}

.doc-source {
    margin-top: 2.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ---------- Kielivalinta-etusivu ---------- */

.lang-pick {
    flex: 1 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 3rem var(--gutter);
}

.lang-pick .inner {
    max-width: 32rem;
}

.lang-pick img {
    width: 200px;
    max-width: 60%;
    height: auto;
    margin-bottom: 1.5rem;
}

.lang-pick h1 {
    font-size: 2.2rem;
    margin: 0 0 0.5rem;
}

.lang-pick p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.lang-pick .choices {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem;
}

.lang-pick .choices a {
    min-width: 9rem;
}

/* ---------- Hieman leveämmät näytöt ---------- */

@media (min-width: 720px) {
    .cards {
        grid-template-columns: 1fr 1fr;
    }

    .hero h1 {
        font-size: 2.8rem;
    }
}

/* ---------- Suuremmat kosketuskohteet pienillä laitteilla ---------- */

@media (max-width: 480px) {
    .btn {
        width: 100%;
    }
}

/* ---------- Palautelomake ---------- */

.feedback-form {
    margin: 1.25rem 0 2.5rem;
    padding: 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
}

.feedback-form label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.35rem;
}

.feedback-form input[type="text"],
.feedback-form textarea {
    width: 100%;
    padding: 0.65rem 0.75rem;
    font: inherit;
    color: var(--text);
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 0.25rem;
}

.feedback-form textarea {
    resize: vertical;
    min-height: 8rem;
    line-height: 1.45;
}

.feedback-form input:focus-visible,
.feedback-form textarea:focus-visible {
    border-color: var(--brand-strong);
    outline: none;
    box-shadow: 0 0 0 2px var(--brand);
}

.feedback-form button {
    cursor: pointer;
    font: inherit;
}

.form-note {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.feedback-form .btn + .btn {
    margin-left: 0.5rem;
}

@media (max-width: 480px) {
    .feedback-form .btn + .btn {
        margin-left: 0;
        margin-top: 0.5rem;
    }
}

/* ---------- Blogi ---------- */

.blog-list {
    list-style: none;
    padding: 0;
    margin: 2rem 0 0;
}

.blog-item {
    margin: 0;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border);
}

.blog-item:first-child {
    padding-top: 0;
}

.blog-item article h2 {
    margin-top: 0.35rem;
    font-size: 1.35rem;
}

.blog-item article h2 a {
    text-decoration: none;
    color: var(--text);
}

.blog-item article h2 a:hover,
.blog-item article h2 a:focus-visible {
    color: var(--link);
    text-decoration: underline;
}

.blog-meta {
    margin: 0 0 0.25rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

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

.blog-post .blog-meta {
    margin-bottom: 0.5rem;
}

.blog-post h1 {
    margin-top: 0.5rem;
}

/* ---------- Vähennetty liike ---------- */

@media (prefers-reduced-motion: reduce) {
    * {
        scroll-behavior: auto !important;
    }
}