/* Brand colors and fonts for the whole site. Change them here only.
   Values match konowebsite2's palette. Every text pair meets 4.5:1 contrast. */

/* IBM Plex Sans, self-hosted in static/vendor/ibm-plex-sans-1.1.0/ (SIL Open Font License). */
@font-face {
    font-family: 'IBM Plex Sans';
    src: url('../../vendor/ibm-plex-sans-1.1.0/fonts/IBMPlexSans-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Sans';
    src: url('../../vendor/ibm-plex-sans-1.1.0/fonts/IBMPlexSans-SemiBold.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'IBM Plex Sans';
    src: url('../../vendor/ibm-plex-sans-1.1.0/fonts/IBMPlexSans-Italic.woff2') format('woff2');
    font-weight: 400;
    font-style: italic;
    font-display: swap;
}

:root {
    --brand-navbar: #2F4052;
    --brand-navbar-rgb: 47, 64, 82;

    /* Light mode is the default. */
    --color-page: #ffffff;
    --color-surface: #f4f8f9;
    --color-text: #0b1420;
    --color-muted: #2F4052;
    --color-accent: #357883;
    --color-accent-hover: #2a6670;
    --color-on-accent: #ffffff;
    --color-border: rgba(47, 64, 82, 0.18);
    --color-border-strong: rgba(47, 64, 82, 0.55);

    --nav-bg: rgba(255, 255, 255, 0.55);
    --nav-text: #2F4052;
    --nav-border: rgba(47, 64, 82, 0.14);

    --grid-minor: rgba(47, 64, 82, 0.05);
    --grid-major: rgba(47, 64, 82, 0.10);
    --grid-minor-size: 24px;
    --grid-major-size: 120px;

    --font-sans: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --radius: 6px;
    --section-space: clamp(2rem, 3.5vw, 3rem);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-page: #0b1420;
        --color-surface: #14263a;
        --color-text: #eef5f7;
        --color-muted: #bccdd5;
        --color-accent: #71cdde;
        --color-accent-hover: #9ddde9;
        --color-on-accent: #0b1420;
        --color-border: rgba(180, 225, 225, 0.16);
        --color-border-strong: rgba(188, 205, 213, 0.6);
        --nav-bg: rgba(var(--brand-navbar-rgb), 0.6);
        --nav-text: #eef5f7;
        --nav-border: rgba(255, 255, 255, 0.08);
        --grid-minor: rgba(180, 225, 225, 0.06);
        --grid-major: rgba(180, 225, 225, 0.12);
    }
}

:root[data-theme="dark"] {
    --color-page: #0b1420;
    --color-surface: #14263a;
    --color-text: #eef5f7;
    --color-muted: #bccdd5;
    --color-accent: #71cdde;
    --color-accent-hover: #9ddde9;
    --color-on-accent: #0b1420;
    --color-border: rgba(180, 225, 225, 0.16);
    --color-border-strong: rgba(188, 205, 213, 0.6);
    --nav-bg: rgba(var(--brand-navbar-rgb), 0.6);
    --nav-text: #eef5f7;
    --nav-border: rgba(255, 255, 255, 0.08);
    --grid-minor: rgba(180, 225, 225, 0.06);
    --grid-major: rgba(180, 225, 225, 0.12);
}

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

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-family: var(--font-sans);
    font-weight: 400;
    font-size: 1.125rem;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-page);
    background-image:
        linear-gradient(to right, var(--grid-major) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-major) 1px, transparent 1px),
        linear-gradient(to right, var(--grid-minor) 1px, transparent 1px),
        linear-gradient(to bottom, var(--grid-minor) 1px, transparent 1px);
    background-size:
        var(--grid-major-size) var(--grid-major-size),
        var(--grid-major-size) var(--grid-major-size),
        var(--grid-minor-size) var(--grid-minor-size),
        var(--grid-minor-size) var(--grid-minor-size);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}