/*
 * Cookie consent banner and preferences panel.
 *
 * A proper EU GDPR cookie banner: fixed to the bottom of the viewport, modern and clean,
 * with a slide-up preferences panel for granular control. The banner appears only when no
 * consent cookie exists. The preferences panel slides up from the banner.
 *
 * Design: matches the EU Book design system tokens. No custom colours.
 * Accessibility: role="dialog", aria-live, keyboard focus management, visible focus indicators.
 */

/* ---- Banner ------------------------------------------------------------------------------- */

.cookie-banner {
    position: fixed;
    bottom: 0;
    inset-inline: 0;
    z-index: var(--layer-overlay);
    padding: var(--space-4);
    background: var(--colour-surface-overlay);
    border-top: 1px solid var(--colour-border);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.12);
    animation: cookie-slide-up var(--duration-base) var(--easing);
}

.cookie-banner[hidden] {
    display: none;
}

.cookie-banner__inner {
    max-width: var(--page-width);
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: var(--space-5);
}

.cookie-banner__content {
    flex: 1;
    min-width: 280px;
}

.cookie-banner__title {
    font-size: var(--text-lg);
    font-weight: var(--weight-bold);
    color: var(--colour-ink);
    margin: 0 0 var(--space-2);
    line-height: var(--leading-tight);
}

.cookie-banner__text {
    font-size: var(--text-sm);
    color: var(--colour-ink-quiet);
    line-height: var(--leading-body);
    margin: 0;
    max-width: 60ch;
}

.cookie-banner__link {
    color: var(--colour-primary);
    text-decoration: underline;
}

.cookie-banner__link:hover {
    color: var(--colour-primary-hover);
}

.cookie-banner__link:focus-visible {
    outline: var(--focus-width) solid var(--colour-focus);
    outline-offset: var(--focus-offset);
    border-radius: var(--radius-sm);
}

.cookie-banner__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    align-items: center;
}

/* ---- Preferences panel -------------------------------------------------------------------- */

.cookie-preferences {
    position: fixed;
    bottom: 0;
    inset-inline: 0;
    z-index: calc(var(--layer-overlay) + 1);
    max-height: 85vh;
    overflow-y: auto;
    background: var(--colour-surface-overlay);
    border-top: 2px solid var(--colour-primary);
    box-shadow: 0 -8px 30px rgba(0, 0, 0, 0.15);
    animation: cookie-slide-up var(--duration-base) var(--easing);
}

.cookie-preferences[hidden] {
    display: none;
}

.cookie-preferences__inner {
    max-width: var(--page-width);
    margin: 0 auto;
    padding: var(--space-5) var(--gutter);
}

.cookie-preferences__header {
    margin-bottom: var(--space-5);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--colour-border);
}

.cookie-preferences__title {
    font-size: var(--text-xl);
    font-weight: var(--weight-bold);
    color: var(--colour-ink);
    margin: 0 0 var(--space-2);
}

.cookie-preferences__description {
    font-size: var(--text-sm);
    color: var(--colour-ink-quiet);
    line-height: var(--leading-body);
    margin: 0;
    max-width: var(--measure);
}

/* ---- Category list ------------------------------------------------------------------------ */

.cookie-preferences__categories {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.cookie-preferences__category {
    padding: var(--space-4);
    border: 1px solid var(--colour-border);
    border-radius: var(--radius-md);
    transition: border-color var(--duration-base) var(--easing);
}

.cookie-preferences__category:hover {
    border-color: var(--colour-border-strong);
}

.cookie-preferences__category-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
}

.cookie-preferences__category-info {
    flex: 1;
    min-width: 0;
}

.cookie-preferences__category-name {
    font-size: var(--text-base);
    font-weight: var(--weight-bold);
    color: var(--colour-ink);
    margin: 0 0 var(--space-1);
}

.cookie-preferences__category-desc {
    font-size: var(--text-sm);
    color: var(--colour-ink-quiet);
    line-height: var(--leading-body);
    margin: 0;
}

.cookie-preferences__badge {
    display: inline-block;
    margin-top: var(--space-2);
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    border-radius: var(--radius-sm);
}

.cookie-preferences__badge--always {
    background: var(--colour-success-surface);
    color: var(--colour-success-ink);
}

/* ---- Toggle switch ------------------------------------------------------------------------ */

.cookie-preferences__toggle {
    flex-shrink: 0;
    padding-top: var(--space-1);
}

.cookie-toggle {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.cookie-toggle__label {
    display: inline-block;
    cursor: pointer;
}

.cookie-toggle:disabled + .cookie-toggle__label {
    cursor: not-allowed;
    opacity: 0.7;
}

.cookie-toggle__track {
    display: inline-block;
    width: 44px;
    height: 24px;
    background: var(--colour-border-strong);
    border-radius: var(--radius-full);
    position: relative;
    transition: background var(--duration-base) var(--easing);
    vertical-align: middle;
}

.cookie-toggle__thumb {
    display: block;
    width: 18px;
    height: 18px;
    background: var(--colour-surface);
    border-radius: var(--radius-full);
    position: absolute;
    top: 3px;
    inset-inline-start: 3px;
    transition: transform var(--duration-base) var(--easing);
    box-shadow: var(--shadow-sm);
}

.cookie-toggle:checked + .cookie-toggle__label .cookie-toggle__track {
    background: var(--colour-primary);
}

.cookie-toggle:checked + .cookie-toggle__label .cookie-toggle__thumb {
    transform: translateX(20px);
}

.cookie-toggle:focus-visible + .cookie-toggle__label .cookie-toggle__track {
    outline: var(--focus-width) solid var(--colour-focus);
    outline-offset: var(--focus-offset);
}

/* ---- Actions row -------------------------------------------------------------------------- */

.cookie-preferences__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-5);
    padding-top: var(--space-4);
    border-top: 1px solid var(--colour-border);
}

/* ---- Small floating button to reopen preferences ------------------------------------------ */

.cookie-reopen {
    position: fixed;
    bottom: var(--space-4);
    inset-inline-end: var(--space-4);
    z-index: calc(var(--layer-overlay) - 1);
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--colour-surface-overlay);
    border: 1px solid var(--colour-border);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    color: var(--colour-ink-quiet);
    transition: color var(--duration-base) var(--easing),
                border-color var(--duration-base) var(--easing);
}

.cookie-reopen:hover {
    color: var(--colour-primary);
    border-color: var(--colour-primary);
}

.cookie-reopen:focus-visible {
    outline: var(--focus-width) solid var(--colour-focus);
    outline-offset: var(--focus-offset);
}

.cookie-reopen--visible {
    display: flex;
}

/* ---- Animation ---------------------------------------------------------------------------- */

@keyframes cookie-slide-up {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@media (prefers-reduced-motion: reduce) {
    .cookie-banner,
    .cookie-preferences {
        animation: none;
    }
}

/* ---- Responsive --------------------------------------------------------------------------- */

@media (max-width: 640px) {
    .cookie-banner__inner {
        flex-direction: column;
    }

    .cookie-banner__actions {
        width: 100%;
        flex-direction: column;
    }

    .cookie-banner__actions .btn {
        width: 100%;
    }

    .cookie-preferences__category-header {
        flex-direction: column;
        gap: var(--space-3);
    }

    .cookie-preferences__actions {
        flex-direction: column;
    }

    .cookie-preferences__actions .btn {
        width: 100%;
    }
}