/**
 * Keyboard Lab - Global Theme Layer
 * Shared light/dark tokens, chrome styling, and content typography.
 */

:root {
    color-scheme: light;

    --theme-bg: #f2f4f7;
    --theme-body-bg: #f2f4f7;
    --theme-surface: #ffffff;
    --theme-surface-elevated: rgba(255, 255, 255, 0.82);
    --theme-surface-soft: #f7f9fc;
    --theme-surface-strong: #edf2f8;

    --theme-text: #0b1220;
    --theme-muted: #5a6170;
    --theme-muted-strong: #243045;
    --theme-border: #d8dde7;
    --theme-border-strong: #bdc8d8;

    --theme-accent: #9d50bb;
    --theme-accent-soft: rgba(157, 80, 187, 0.16);
    --theme-accent-glow: 0 0 16px rgba(157, 80, 187, 0.24);

    --theme-success: #00d166;
    --theme-warning: #ff3b30;

    --theme-link: #163a72;
    --theme-link-hover: #0f2a53;
    --theme-focus: #005fcc;

    --theme-header-bg: rgba(255, 255, 255, 0.68);
    --theme-header-border: rgba(26, 32, 44, 0.16);
    --theme-header-shadow: none;

    --theme-footer-bg: linear-gradient(180deg, #e9edf3 0%, #e4e9f1 100%);
    --theme-footer-border: rgba(20, 28, 40, 0.16);
    --theme-footer-shadow: none;
}

html[data-theme="dark"] {
    color-scheme: dark;

    --theme-bg: #0b0e14;
    --theme-body-bg:
        radial-gradient(circle at 12% 8%, rgba(157, 80, 187, 0.2), transparent 35%),
        radial-gradient(circle at 90% 90%, rgba(157, 80, 187, 0.12), transparent 40%),
        linear-gradient(180deg, #0b0e14 0%, #0a1019 100%);
    --theme-surface: #121927;
    --theme-surface-elevated: rgba(17, 23, 36, 0.84);
    --theme-surface-soft: #101726;
    --theme-surface-strong: #161f2f;

    --theme-text: #f2f4f7;
    --theme-muted: #a8b2c6;
    --theme-muted-strong: #d2d9e8;
    --theme-border: #223047;
    --theme-border-strong: #30445f;

    --theme-accent: #9d50bb;
    --theme-accent-soft: rgba(157, 80, 187, 0.24);
    --theme-accent-glow: 0 0 24px rgba(157, 80, 187, 0.4);

    --theme-success: #00d166;
    --theme-warning: #ff3b30;

    --theme-link: #d4b6e4;
    --theme-link-hover: #ead8f4;
    --theme-focus: #7fb2ff;

    --theme-header-bg: rgba(17, 23, 36, 0.76);
    --theme-header-border: rgba(242, 244, 247, 0.18);
    --theme-header-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.06);

    --theme-footer-bg: linear-gradient(180deg, #121927 0%, #101826 100%);
    --theme-footer-border: #223047;
    --theme-footer-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
}

body.kbdlab {
    --lab-bg: var(--theme-bg);
    --lab-surface: var(--theme-surface);
    --lab-text: var(--theme-text);
    --lab-muted: var(--theme-muted);
    --lab-border: var(--theme-border);
    --lab-accent: var(--theme-success);
    --lab-warn: var(--theme-warning);

    --arena-bg: var(--theme-bg);
    --arena-surface: var(--theme-surface);
    --arena-surface-strong: var(--theme-surface-strong);
    --arena-text: var(--theme-text);
    --arena-muted: var(--theme-muted);
    --arena-border: var(--theme-border);
    --arena-accent: var(--theme-accent);
    --arena-accent-soft: var(--theme-accent-soft);
    --arena-accent-glow: var(--theme-accent-glow);

    --focus-ring: var(--theme-focus);

    background: var(--theme-body-bg);
    color: var(--theme-text);
}

body.kbdlab.kbdlab--lab,
body.kbdlab.kbdlab--arena {
    background: var(--theme-body-bg);
    color: var(--theme-text);
}

body.kbdlab .kbdlab-header__inner {
    border-color: var(--theme-header-border);
    background: var(--theme-header-bg);
    box-shadow: var(--theme-header-shadow);
}

body.kbdlab .kbdlab-header__brand,
body.kbdlab .kbdlab-nav__link {
    color: var(--theme-text);
}

body.kbdlab .kbdlab-nav {
    align-items: center;
}

body.kbdlab .kbdlab-nav__link::after {
    background: var(--theme-accent);
    opacity: 0.62;
}

body.kbdlab .kbdlab-nav__link.is-active,
body.kbdlab .kbdlab-nav__link[aria-current="page"] {
    background: var(--theme-accent-soft);
    box-shadow: inset 0 0 0 1px rgba(157, 80, 187, 0.5);
}

body.kbdlab .kbdlab-theme-toggle {
    appearance: none;
    border: 1px solid var(--theme-border);
    border-radius: 999px;
    min-height: 2.1rem;
    padding: 0.35rem 0.7rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    background: var(--theme-surface-elevated);
    color: var(--theme-text);
    font: inherit;
    font-size: 0.82rem;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    transition: border-color 0.16s ease, background-color 0.16s ease, transform 0.16s ease;
}

body.kbdlab .kbdlab-theme-toggle:hover {
    border-color: rgba(157, 80, 187, 0.52);
    background: var(--theme-accent-soft);
    transform: translateY(-1px);
}

body.kbdlab .kbdlab-theme-toggle[aria-pressed="true"] {
    border-color: rgba(157, 80, 187, 0.68);
    background: rgba(157, 80, 187, 0.22);
}

body.kbdlab .kbdlab-theme-toggle:focus-visible {
    outline: 3px solid var(--theme-focus);
    outline-offset: 2px;
}

body.kbdlab .kbdlab-theme-toggle__glyph {
    font-size: 0.95rem;
    line-height: 1;
}

body.kbdlab .kbdlab-footer__inner {
    border-color: var(--theme-footer-border);
    background: var(--theme-footer-bg);
    box-shadow: var(--theme-footer-shadow);
}

body.kbdlab .kbdlab-footer__trust p,
body.kbdlab .kbdlab-footer__meta p {
    color: var(--theme-muted);
}

body.kbdlab .kbdlab-footer__meta {
    border-top-color: rgba(89, 100, 122, 0.28);
}

body.kbdlab .kbdlab-footer__badge {
    border-color: rgba(157, 80, 187, 0.62);
    background: rgba(157, 80, 187, 0.18);
}

body.kbdlab .kbdlab-footer__link:hover,
body.kbdlab .kbdlab-footer__link:focus-visible {
    border-color: rgba(157, 80, 187, 0.5);
    background: rgba(157, 80, 187, 0.14);
}

body.kbdlab .kl-trust-banner {
    border-color: var(--theme-border);
    background: var(--theme-surface-elevated);
    box-shadow: 0 8px 20px rgba(10, 14, 20, 0.08);
}

body.kbdlab .kl-trust-banner__eyebrow,
body.kbdlab .kl-trust-banner__copy,
body.kbdlab .kbdlab-badge__subtitle,
body.kbdlab .kbdlab-badge__icon {
    color: var(--theme-muted);
}

body.kbdlab .kbdlab-badge {
    border-color: var(--theme-border);
    background: var(--theme-surface-elevated);
}

.kbdlab-content {
    color: var(--theme-text);
    font-size: clamp(1rem, 0.97rem + 0.2vw, 1.08rem);
    line-height: 1.72;
}

.kbdlab-content h1,
.kbdlab-content h2,
.kbdlab-content h3 {
    color: var(--theme-text);
    line-height: 1.22;
    letter-spacing: -0.01em;
}

.kbdlab-content h1 {
    font-size: clamp(2rem, 3.8vw, 3rem);
    font-weight: 800;
}

.kbdlab-content h2 {
    font-size: clamp(1.38rem, 2.6vw, 1.95rem);
    font-weight: 700;
    margin-top: clamp(1.5rem, 3.4vw, 2.1rem);
    margin-bottom: 0.75rem;
}

.kbdlab-content h3 {
    font-size: clamp(1.06rem, 2vw, 1.32rem);
    font-weight: 700;
    margin-top: 1rem;
    margin-bottom: 0.6rem;
}

.kbdlab-content p,
.kbdlab-content ul,
.kbdlab-content ol,
.kbdlab-content blockquote {
    max-width: 72ch;
}

.kbdlab-content p,
.kbdlab-content li {
    color: var(--theme-muted-strong);
}

.kbdlab-content li {
    margin: 0.4rem 0;
}

.kbdlab-content ul,
.kbdlab-content ol {
    padding-left: 1.2rem;
}

.kbdlab-content a {
    color: var(--theme-link);
    text-decoration: underline;
    text-decoration-thickness: 1.5px;
    text-underline-offset: 0.2em;
}

.kbdlab-content a:hover {
    color: var(--theme-link-hover);
    text-decoration-thickness: 2px;
}

.kbdlab-content a:focus-visible {
    outline: 3px solid var(--theme-focus);
    outline-offset: 2px;
    border-radius: 4px;
}

.kbdlab-content hr {
    border: 0;
    border-top: 1px solid var(--theme-border);
    margin: 1.2rem 0;
}

.kbdlab-content blockquote {
    margin: 1rem 0;
    padding: 0.8rem 0.95rem;
    border-left: 3px solid rgba(157, 80, 187, 0.62);
    background: rgba(157, 80, 187, 0.1);
    border-radius: 8px;
}

.kbdlab-content code,
.kbdlab-content pre {
    font-family: var(--font-mono);
}

.kbdlab-content pre {
    max-width: 100%;
    overflow-x: auto;
    border-radius: 10px;
    border: 1px solid var(--theme-border);
    background: var(--theme-surface-soft);
    padding: 0.8rem 0.9rem;
}

.kbdlab-content table {
    width: 100%;
    max-width: 100%;
    display: block;
    overflow-x: auto;
    border-collapse: collapse;
}

.kbdlab-content th,
.kbdlab-content td {
    border: 1px solid var(--theme-border);
    padding: 0.6rem 0.68rem;
    text-align: left;
}

.kbdlab-content th {
    background: var(--theme-surface-strong);
}

html[data-theme="dark"] .kbdlab-page--about,
html[data-theme="dark"] .kbdlab-page--contact,
html[data-theme="dark"] .kbdlab-page--legal {
    background: transparent;
    color: var(--theme-text);
}

html[data-theme="dark"] .kbdlab-page--about .kbdlab-card,
html[data-theme="dark"] .kbdlab-page--contact .kbdlab-contact-panel,
html[data-theme="dark"] .kbdlab-page--contact .kbc-alert,
html[data-theme="dark"] .kbdlab-page--legal .kc-legal__header,
html[data-theme="dark"] .kbdlab-page--legal .kc-legal__section {
    background: var(--theme-surface);
    border-color: var(--theme-border);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.03);
}

html[data-theme="dark"] .kbdlab-page--about .kbc-btn,
html[data-theme="dark"] .kbdlab-page--contact .kbc-btn {
    background: var(--theme-surface-strong);
    border-color: var(--theme-border-strong);
    color: var(--theme-text);
}

@media (max-width: 760px) {
    body.kbdlab .kbdlab-header {
        padding-inline: 0.65rem;
    }

    body.kbdlab .kbdlab-header__inner {
        width: calc(100% - 0.5rem);
        padding-inline: 0.55rem;
    }

    body.kbdlab .kbdlab-nav {
        gap: 0.3rem;
    }

    body.kbdlab .kbdlab-nav__link,
    body.kbdlab .kbdlab-theme-toggle {
        min-height: 2rem;
        padding: 0.32rem 0.62rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    body.kbdlab .kbdlab-theme-toggle,
    body.kbdlab .kbdlab-nav__link {
        transition: none;
    }
}