/* ============================================================
   URN Design Tokens — Elicit-inspired
   ------------------------------------------------------------
   Single source of truth for typography, colour, spacing,
   radius, and motion. Loaded site-wide via includes/header.php.
   Page-specific CSS may override individual properties but
   should reference the tokens by name (var(--c-text-primary))
   rather than re-introducing raw hex values.
   ============================================================ */

:root {
    /* Font family */
    --urn-font-stack: 'Funnel Display', 'Special Gothic Variable', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --urn-font-mono: 'Courier New', 'Roboto Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    /* Typography scale — strict, no in-between values */
    --urn-fs-xs:  12px;
    --urn-fs-sm:  14.4px;
    --urn-fs-md:  15.2px;
    --urn-fs-lg:  16px;
    --urn-fs-xl:  17.6px;    /* base body size */
    --urn-fs-2xl: 20.8px;
    --urn-fs-3xl: 22.4px;
    --urn-fs-4xl: 23.2px;
    --urn-lh-base: 26.4px;
    --urn-lh-tight: 1.15;
    --urn-lh-loose: 1.65;

    /* Colour palette — semantic */
    --urn-c-text-primary:   #083d44;   /* deep teal — headings + body */
    --urn-c-text-secondary: #355c63;   /* softer teal for muted text */
    --urn-c-text-inverse:   #0000ee;   /* electric blue — links + active accent */
    --urn-c-text-tertiary:  #fcfcf8;   /* warm cream — text on dark surfaces */
    --urn-c-surface-base:   #000000;   /* black — primary buttons + accents */
    --urn-c-surface-muted:  #eaebe4;   /* warm grey — secondary surfaces */
    --urn-c-surface-cream:  #fcfcf8;   /* cream — section backgrounds */
    --urn-c-border-subtle:  rgba(8, 61, 68, 0.12);
    --urn-c-border-strong:  rgba(8, 61, 68, 0.30);

    /* Status colours — kept distinct from the core palette */
    --urn-c-success: #047857;
    --urn-c-warning: #b45309;
    --urn-c-danger:  #b91c1c;

    /* Spacing scale */
    --urn-sp-1: 4px;
    --urn-sp-2: 5px;
    --urn-sp-3: 6px;
    --urn-sp-4: 8px;
    --urn-sp-5: 10px;
    --urn-sp-6: 12px;
    --urn-sp-7: 14px;
    --urn-sp-8: 16px;

    /* Radius */
    --urn-r-xs: 6px;
    --urn-r-sm: 8px;
    --urn-r-md: 10px;

    /* Motion */
    --urn-motion-instant: 200ms;
    --urn-motion-easing:  cubic-bezier(0.4, 0.0, 0.2, 1);
}

/* ============================================================
   Global typography — applies to every page that loads the
   header. Page-specific styles can still override locally.
   ============================================================ */

body {
    font-family: var(--urn-font-stack);
    font-size: var(--urn-fs-xl);
    line-height: var(--urn-lh-base);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    font-family: var(--urn-font-stack);
    font-weight: 600;
    line-height: var(--urn-lh-tight);
    letter-spacing: -0.01em;
}

/* Generic prose links — does not override styled buttons */
.urn-content a,
a.urn-link {
    color: var(--urn-c-text-inverse);
    text-decoration: underline;
    text-underline-offset: 3px;
    text-decoration-thickness: 1px;
    transition: opacity var(--urn-motion-instant) var(--urn-motion-easing);
}
.urn-content a:hover,
a.urn-link:hover { opacity: 0.7; }

/* Focus-visible — applied globally so every interactive element
   gets a visible keyboard ring without each page having to
   re-declare it. Skipped when the user is mouse-clicking. */
a:focus-visible,
button:focus-visible,
[role="button"]:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.btn:focus-visible,
.nav-link:focus-visible,
.dropdown-item:focus-visible {
    outline: 2px solid var(--urn-c-text-inverse);
    outline-offset: 2px;
    border-radius: var(--urn-r-xs);
}

/* ============================================================
   Reusable utility classes — opt-in
   ============================================================ */

.urn-eyebrow {
    display: inline-block;
    font-size: var(--urn-fs-xs);
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-weight: 600;
    padding: var(--urn-sp-2) var(--urn-sp-6);
    background: var(--urn-c-surface-muted);
    color: var(--urn-c-text-primary);
    border-radius: 999px;
}

.urn-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--urn-sp-3);
    font-family: var(--urn-font-stack);
    font-size: var(--urn-fs-md);
    font-weight: 500;
    line-height: 1;
    padding: var(--urn-sp-6) var(--urn-sp-8);
    border-radius: var(--urn-r-md);
    text-decoration: none;
    border: 1px solid transparent;
    cursor: pointer;
    background: var(--urn-c-surface-base);
    color: var(--urn-c-text-tertiary);
    transition: transform var(--urn-motion-instant) var(--urn-motion-easing),
                box-shadow var(--urn-motion-instant) var(--urn-motion-easing);
}
.urn-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(8, 61, 68, 0.18);
    color: var(--urn-c-text-tertiary);
}
.urn-btn:disabled, .urn-btn[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}
.urn-btn-ghost {
    background: transparent;
    color: var(--urn-c-text-primary);
    border-color: var(--urn-c-text-primary);
}
.urn-btn-ghost:hover { background: var(--urn-c-surface-muted); color: var(--urn-c-text-primary); }

.urn-card {
    background: var(--urn-c-surface-cream);
    border: 1px solid var(--urn-c-border-subtle);
    border-radius: var(--urn-r-md);
    padding: var(--urn-sp-8);
    transition: box-shadow var(--urn-motion-instant) var(--urn-motion-easing),
                transform var(--urn-motion-instant) var(--urn-motion-easing);
}
.urn-card:hover {
    box-shadow: 0 12px 30px rgba(8, 61, 68, 0.10);
    transform: translateY(-2px);
}

/* Input field — Elicit style */
.urn-input {
    font-family: var(--urn-font-stack);
    font-size: var(--urn-fs-lg);
    font-weight: 400;
    background: var(--urn-c-surface-cream);
    color: var(--urn-c-text-primary);
    border: 1.5px solid var(--urn-c-border-strong);
    border-radius: var(--urn-r-sm);
    padding: var(--urn-sp-5) var(--urn-sp-6);
    outline: none;
    transition: border-color var(--urn-motion-instant) var(--urn-motion-easing),
                box-shadow var(--urn-motion-instant) var(--urn-motion-easing);
    width: 100%;
}
.urn-input:hover { border-color: var(--urn-c-text-primary); }
.urn-input:focus-visible {
    border-color: var(--urn-c-text-inverse);
    box-shadow: 0 0 0 3px rgba(0, 0, 238, 0.15);
}
.urn-input:disabled { opacity: 0.5; cursor: not-allowed; }
.urn-input[aria-invalid="true"] { border-color: var(--urn-c-danger); }

/* ============================================================
   Section helpers
   ============================================================ */

.urn-section {
    padding: 70px 0;
}
.urn-section--cream  { background: var(--urn-c-surface-cream); color: var(--urn-c-text-primary); }
.urn-section--muted  { background: var(--urn-c-surface-muted); color: var(--urn-c-text-primary); }
.urn-section--dark   { background: var(--urn-c-surface-base);  color: var(--urn-c-text-tertiary); }

/* ============================================================
   Accessibility helpers
   ============================================================ */

.visually-hidden,
.urn-visually-hidden {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Respect user motion preference */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}