/*
 * Keka Checkout Checker — shared marketing site styles.
 *
 * Design language: warm paper + a single terracotta ink accent, flat
 * surfaces, hairline borders instead of soft shadows, monospace for
 * numbers/time. Body copy stays on the system font stack; Material
 * Symbols is the one deliberate external request, loaded for icons.
 */

:root {
    color-scheme: light;

    /* Accent — a single flat terracotta, used sparingly */
    --accent: #c1592a;
    --accent-strong: #9c481f;
    --accent-soft: #f4e3d7;
    --accent-contrast: #fffaf5;

    /* Surface */
    --bg: #faf7f2;
    --surface: #ffffff;
    --surface-muted: #f4efe6;
    --border: #e6ddcd;
    --border-strong: #d5c8b0;

    /* Text */
    --text: #201c17;
    --text-muted: #5b544a;
    --text-faint: #8a8272;
    --text-on-dark: #faf7f2;

    /* Status */
    --success: #2f7a4d;
    --success-bg: #e9f2ea;
    --success-border: #c4dcc8;
    --warning: #8a5a10;
    --warning-bg: #f7ecd8;
    --warning-border: #e3cd9c;
    --danger: #a83b2e;
    --danger-bg: #f6e5e0;
    --danger-border: #e2c1b6;
    --info: #33587a;
    --info-bg: #e6edf2;
    --info-border: #c3d3df;

    --radius-sm: 4px;
    --radius-md: 8px;
    --font-mono:
        ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", Menlo,
        monospace;

    --content-width: 1080px;
    --content-narrow: 760px;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #171410;
    --surface: #1e1a14;
    --surface-muted: #241f18;
    --border: #322b21;
    --border-strong: #423a2c;

    --text: #f2ede2;
    --text-muted: #bcb2a0;
    --text-faint: #857c6c;

    --accent: #e0855a;
    --accent-strong: #ef9a72;
    --accent-soft: #3a2a1e;

    --success: #6fbf8b;
    --success-bg: #1c2c21;
    --success-border: #30432f;
    --warning: #dcae5c;
    --warning-bg: #2e2515;
    --warning-border: #493a20;
    --danger: #d98873;
    --danger-bg: #2f2019;
    --danger-border: #4a2f26;
    --info: #8fb2d1;
    --info-bg: #1a232c;
    --info-border: #2b3a48;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --bg: #171410;
        --surface: #1e1a14;
        --surface-muted: #241f18;
        --border: #322b21;
        --border-strong: #423a2c;

        --text: #f2ede2;
        --text-muted: #bcb2a0;
        --text-faint: #857c6c;

        --accent: #e0855a;
        --accent-strong: #ef9a72;
        --accent-soft: #3a2a1e;

        --success: #6fbf8b;
        --success-bg: #1c2c21;
        --success-border: #30432f;
        --warning: #dcae5c;
        --warning-bg: #2e2515;
        --warning-border: #493a20;
        --danger: #d98873;
        --danger-bg: #2f2019;
        --danger-border: #4a2f26;
        --info: #8fb2d1;
        --info-bg: #1a232c;
        --info-border: #2b3a48;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
        Cantarell, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.65;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
}

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

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

/* ---------- Icons (Material Symbols) ---------- */

.material-symbols-outlined {
    font-variation-settings:
        "FILL" 0,
        "wght" 400,
        "GRAD" 0,
        "opsz" 24;
    font-size: 20px;
    line-height: 1;
    vertical-align: middle;
    display: inline-block;
}

.skip-link {
    position: absolute;
    left: 1rem;
    top: -3rem;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border-strong);
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    z-index: 100;
    transition: top 0.15s ease;
}

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

/* ---------- Layout shell ---------- */

.page {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.wrap {
    width: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

main {
    flex: 1;
}

/* ---------- Navigation ---------- */

.site-nav {
    position: sticky;
    top: 0;
    z-index: 40;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
}

.site-nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 16px 24px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 9px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 1.02rem;
    letter-spacing: -0.01em;
}

.brand img {
    width: 24px;
    height: 24px;
    border-radius: 5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 26px;
    list-style: none;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.94rem;
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition:
        color 0.15s ease,
        border-color 0.15s ease;
}

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

.nav-links a[aria-current="page"] {
    color: var(--text);
    border-color: var(--accent);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    transition:
        border-color 0.15s ease,
        color 0.15s ease;
}

.theme-toggle:hover {
    border-color: var(--border-strong);
    color: var(--text);
}

.theme-toggle .icon-dark {
    display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-light {
    display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-dark {
    display: inline;
}

.nav-toggle {
    display: none;
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: none;
    color: var(--text);
    cursor: pointer;
    font-size: 1.05rem;
}

@media (max-width: 780px) {
    .nav-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .nav-links {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        gap: 0;
        display: none;
    }

    .nav-links.is-open {
        display: flex;
    }

    .nav-links a {
        padding: 14px 24px;
        border-bottom: 1px solid var(--border);
        border-left: 2px solid transparent;
    }

    .nav-links a[aria-current="page"] {
        border-bottom: 1px solid var(--border);
        border-left-color: var(--accent);
    }

    .site-nav__inner {
        position: relative;
    }
}

/* ---------- Buttons ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.98rem;
    border: 1px solid transparent;
    cursor: pointer;
    transition:
        background 0.15s ease,
        border-color 0.15s ease,
        color 0.15s ease;
}

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

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

.btn-outline {
    background: transparent;
    border-color: var(--border-strong);
    color: var(--text);
}

.btn-outline:hover {
    border-color: var(--text);
}

.btn-ghost {
    background: none;
    color: var(--accent);
    border-color: transparent;
    padding-left: 0;
    padding-right: 0;
}

.btn-ghost:hover {
    color: var(--accent-strong);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.88rem;
}

.button-row {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
}

.button-row--center {
    justify-content: center;
}

/* ---------- Hero ---------- */

.hero {
    padding: 80px 0 56px;
    text-align: center;
}

.hero h1 {
    font-size: clamp(2rem, 4.4vw, 3.1rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 18px;
    color: var(--text);
}

.hero h1 em {
    font-style: normal;
    color: var(--accent);
}

.hero p.lede {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 620px;
    margin: 0 auto 34px;
}

.hero--simple {
    padding: 60px 0 24px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 8px;
}

.hero--simple h1 {
    font-size: clamp(1.8rem, 3.4vw, 2.4rem);
}

.hero--simple p.lede {
    font-size: 1.02rem;
    max-width: 540px;
    margin-bottom: 0;
}

/* ---------- Content card ---------- */

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 52px;
    margin: 32px auto 64px;
}

@media (max-width: 780px) {
    .card {
        padding: 30px 20px;
    }

    .hero {
        padding: 56px 0 40px;
    }
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.92rem;
    margin-bottom: 28px;
}

.back-link:hover {
    color: var(--accent);
}

/* ---------- Sections ---------- */

.section {
    margin: 52px 0;
}

.section:first-child {
    margin-top: 0;
}

.section h2 {
    font-size: 1.6rem;
    letter-spacing: -0.01em;
    margin-bottom: 20px;
    color: var(--text);
    scroll-margin-top: 90px;
}

.section h3 {
    font-size: 1.12rem;
    margin: 24px 0 10px;
    color: var(--text);
    scroll-margin-top: 90px;
}

.section p {
    color: var(--text-muted);
    font-size: 1.02rem;
    margin-bottom: 14px;
}

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

.section ul,
.section ol {
    color: var(--text-muted);
    font-size: 1rem;
    margin: 14px 0 14px 24px;
}

.section li {
    margin: 8px 0;
}

.section li strong {
    color: var(--text);
}

/* ---------- Feature list ---------- */

.features {
    margin-top: 10px;
    border-top: 1px solid var(--border);
}

@media (min-width: 820px) {
    .features {
        column-count: 2;
        column-gap: 48px;
    }
}

.feature {
    display: flex;
    gap: 16px;
    padding: 24px 0;
    border-bottom: 1px solid var(--border);
    break-inside: avoid;
}

.feature__icon {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--accent);
}

.feature h3 {
    font-size: 1rem;
    margin: 0 0 6px;
    color: var(--text);
}

.feature p {
    color: var(--text-muted);
    font-size: 0.93rem;
    margin: 0;
}

/* ---------- Steps ---------- */

.steps-list {
    list-style: none;
    margin: 24px 0 0;
    padding: 0;
    counter-reset: step;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.steps-list li {
    counter-increment: step;
    position: relative;
    display: flex;
    gap: 18px;
    padding: 16px 0;
    margin: 0;
    border-bottom: 1px solid var(--border);
}

.steps-list li:last-child {
    border-bottom: none;
}

.steps-list li::before {
    content: counter(step, decimal-leading-zero);
    flex-shrink: 0;
    width: 2.2ch;
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-faint);
    padding-top: 1px;
}

/* ---------- Callouts ---------- */

.callout {
    padding: 16px 18px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    border-left-width: 3px;
    margin: 20px 0;
}

.callout p,
.callout ul {
    margin: 0;
    color: inherit;
}

.callout strong {
    color: inherit;
}

.callout--info {
    background: var(--info-bg);
    border-color: var(--info-border);
    border-left-color: var(--info);
    color: var(--info);
}

.callout--warning {
    background: var(--warning-bg);
    border-color: var(--warning-border);
    border-left-color: var(--warning);
    color: var(--warning);
}

.callout--success {
    background: var(--success-bg);
    border-color: var(--success-border);
    border-left-color: var(--success);
    color: var(--success);
}

.callout--danger {
    background: var(--danger-bg);
    border-color: var(--danger-border);
    border-left-color: var(--danger);
    color: var(--danger);
}

.callout--muted {
    background: var(--surface-muted);
    border-color: var(--border);
    border-left-color: var(--border-strong);
    color: var(--text-muted);
}

.callout ul {
    margin-left: 20px;
    margin-top: 6px;
}

/* ---------- Code ---------- */

code,
.code {
    background: var(--surface-muted);
    border: 1px solid var(--border);
    padding: 2px 7px;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.88em;
    color: var(--accent-strong);
}

/* ---------- Table ---------- */

.table-wrap {
    overflow-x: auto;
    margin: 20px 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
}

th,
td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    color: var(--text-muted);
}

th {
    background: var(--surface-muted);
    color: var(--text);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

tr:last-child td {
    border-bottom: none;
}

/* ---------- Quick-jump tags ---------- */

.chip-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 20px 0 8px;
}

.chip {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.83rem;
    font-weight: 500;
    transition:
        border-color 0.15s ease,
        color 0.15s ease;
}

.chip:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ---------- Timeline (changelog) ---------- */

.timeline {
    margin-top: 30px;
}

.release {
    position: relative;
    padding: 26px 0;
    border-top: 1px solid var(--border);
}

.release:first-of-type {
    border-top: none;
    padding-top: 0;
}

.release__header {
    display: flex;
    align-items: baseline;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}

.release__version {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.01em;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 9px;
    border-radius: var(--radius-sm);
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    border: 1px solid transparent;
}

.badge--latest {
    background: var(--success-bg);
    color: var(--success);
    border-color: var(--success-border);
}

.badge--feature {
    background: var(--info-bg);
    color: var(--info);
    border-color: var(--info-border);
}

.badge--fix {
    background: var(--danger-bg);
    color: var(--danger);
    border-color: var(--danger-border);
}

.badge--improvement {
    background: var(--warning-bg);
    color: var(--warning);
    border-color: var(--warning-border);
}

.release__changes {
    list-style: none;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

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

.release__changes .badge {
    margin-right: 8px;
    vertical-align: middle;
}

.release__sub {
    list-style: disc;
    margin: 8px 0 0 22px;
}

.release__sub li {
    font-size: 0.92rem;
    color: var(--text-faint);
    margin: 4px 0;
}

/* ---------- Accordion (troubleshooting) ---------- */

.faq {
    border-bottom: 1px solid var(--border);
}

.faq:first-of-type {
    border-top: 1px solid var(--border);
}

.faq > summary {
    list-style: none;
    cursor: pointer;
    padding: 18px 4px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-weight: 600;
    font-size: 1.02rem;
    color: var(--text);
}

.faq > summary::-webkit-details-marker {
    display: none;
}

.faq > summary::after {
    content: "+";
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 400;
    color: var(--text-faint);
    flex-shrink: 0;
    transition: transform 0.15s ease;
}

.faq[open] > summary::after {
    transform: rotate(45deg);
}

.faq__body {
    padding: 0 4px 22px;
}

.faq__body > *:first-child {
    margin-top: 0;
}

/* ---------- Contact / link rows ---------- */

.link-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
}

.link-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: border-color 0.15s ease;
}

.link-chip:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* ---------- Footer ---------- */

.site-footer {
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    padding: 32px 0;
}

.site-footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.site-footer__links {
    display: flex;
    gap: 22px;
    flex-wrap: wrap;
    list-style: none;
}

.site-footer__links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
}

.site-footer__links a:hover {
    color: var(--accent);
}

.site-footer__meta {
    font-size: 0.85rem;
    color: var(--text-faint);
}

.site-footer__meta a {
    color: inherit;
    text-decoration: underline;
}

/* ---------- Misc utilities ---------- */

.text-center {
    text-align: center;
}

.mt-lg {
    margin-top: 40px;
}

.disclaimer {
    background: var(--surface-muted);
    border: 1px solid var(--border);
    border-left: 3px solid var(--text-faint);
    color: var(--text-muted);
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    margin: 24px 0;
}

@media (max-width: 780px) {
    .button-row--center {
        flex-direction: column;
        align-items: stretch;
    }

    .button-row--center .btn {
        text-align: center;
    }

    .site-footer__inner {
        flex-direction: column;
        align-items: flex-start;
    }
}