:root {
    /* Colour Palette */
    --color-bg: #fff6ec;
    --color-nav-bg: #c1dde4;
    --color-accent: #2c3a2d;
    --color-accent-hover: #3d4f3e;
    --color-text: #2b2b2b;
    --color-text-light: #555555;
    --color-border: #cccccc;
    --color-link: #0b6abf;
    --color-link-hover: #094d8a;
    --color-white: #ffffff;
    --color-focus: #0b6abf;
    --color-error: #cc0000;
    --color-error-hover: #990000;

    /* Spacing — rem so everything scales with font size */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;

    /* Typography */
    --font-main: 'Open Sans', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-bg: #1a1e1a;
        --color-nav-bg: #243035;
        --color-accent: #a8c5ab;
        --color-accent-hover: #5a7a5c;
        --color-text: #dcdcdc;
        --color-text-light: #a0a0a0;
        --color-border: #3a3a3a;
        --color-link: #6db3e8;
        --color-link-hover: #9dccf0;
        --color-white: #242824;
        --color-focus: #6db3e8;
        --color-error: #ff4444;
        --color-error-hover: #cc2222;
    }
}

:root[data-theme="dark"] {
    --color-bg: #1a1e1a;
    --color-nav-bg: #243035;
    --color-accent: #a8c5ab;
    --color-accent-hover: #5a7a5c;
    --color-text: #dcdcdc;
    --color-text-light: #a0a0a0;
    --color-border: #3a3a3a;
    --color-link: #6db3e8;
    --color-link-hover: #9dccf0;
    --color-white: #242824;
    --color-focus: #6db3e8;
    --color-error: #ff4444;
    --color-error-hover: #cc2222;
}

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

html {
    font-size: clamp(100%, 0.925rem + 0.25vw, 112.5%);
}

html, body {
    height: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: var(--line-height);
}

h1, h2, h3, h4, h5, h6 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

a {
    color: var(--color-link);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-link-hover);
    text-decoration: underline;
}

.hidden {
    display: none !important;
}

/* Skip to content */
.skip-link {
    position: absolute;
    top: -3rem;
    left: 0;
    background: var(--color-accent);
    color: var(--color-white);
    padding: var(--spacing-sm);
    z-index: 100;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
}

:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
}

/* Loading spinner */
.loading-spinner {
    display: inline-block;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: var(--spacing-sm);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

::selection {
    background: var(--color-nav-bg);
    color: var(--color-text);
}