/**
 * UKSR Design Components — BEM Component Library
 *
 * Reusable components using uksr-* prefix.
 * All components consume design tokens from design-tokens.css.
 *
 * Contents:
 *   1. Container & Section
 *   2. Prose
 *   3. Section Headings
 *   4. Buttons
 *   5. Cards
 *   6. Card Grids
 *   7. Stepper / Process Steps
 *   8. Comparison Panels
 *   9. Sibling Navigation
 *
 * @version 1.0.0
 */

/* ================================================================
   1. CONTAINER & SECTION
   ================================================================ */
.uksr-container {
    max-width: var(--uksr-container-max);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--uksr-container-padding);
    padding-right: var(--uksr-container-padding);
}

.uksr-section {
    padding-top: var(--uksr-space-2xl);
    padding-bottom: var(--uksr-space-2xl);
}

.uksr-section--alt {
    background-color: var(--uksr-grey-50);
}

/* ================================================================
   2. PROSE
   ================================================================ */
.uksr-prose {
    font-family: var(--uksr-font-primary);
    line-height: var(--uksr-line-height-relaxed);
    color: var(--uksr-grey-900);
}

.uksr-prose h1,
.uksr-prose h2,
.uksr-prose h3,
.uksr-prose h4,
.uksr-prose h5,
.uksr-prose h6 {
    color: var(--uksr-dark-blue);
    line-height: var(--uksr-line-height-tight);
    margin-top: 1.5em;
    margin-bottom: 0.5em;
}

.uksr-prose p {
    margin-bottom: 1em;
}

.uksr-prose a {
    color: var(--uksr-magenta);
}

.uksr-prose a:hover {
    color: var(--uksr-magenta-dark);
}

/* ================================================================
   3. SECTION HEADINGS
   ================================================================ */
.uksr-section-heading {
    font-family: var(--uksr-font-primary);
    font-size: var(--uksr-font-size-2xl);
    font-weight: var(--uksr-font-weight-bold);
    color: var(--uksr-dark-blue);
    margin-bottom: var(--uksr-space-lg);
    padding-bottom: var(--uksr-space-sm);
    border-bottom: 3px solid var(--uksr-magenta);
    display: inline-block;
}

.uksr-section-heading--center {
    font-family: var(--uksr-font-primary);
    font-size: var(--uksr-font-size-2xl);
    font-weight: var(--uksr-font-weight-bold);
    color: var(--uksr-dark-blue);
    margin-bottom: var(--uksr-space-lg);
    padding-bottom: var(--uksr-space-sm);
    text-align: center;
    display: block;
}

.uksr-section-heading--center::after {
    content: '';
    display: block;
    width: 300px;
    max-width: 80%;
    height: 3px;
    background: var(--uksr-magenta);
    margin: 15px auto 0;
}

.uksr-section-heading--plain {
    font-family: var(--uksr-font-primary);
    font-size: var(--uksr-font-size-2xl);
    font-weight: var(--uksr-font-weight-bold);
    color: var(--uksr-dark-blue);
    margin-bottom: var(--uksr-space-lg);
}

/* ================================================================
   4. BUTTONS
   ================================================================ */
.uksr-btn-primary,
.uksr-btn-secondary,
.uksr-btn-magenta,
.uksr-btn-outline {
    display: inline-block;
    font-family: var(--uksr-font-primary);
    font-size: var(--uksr-font-size-base);
    font-weight: var(--uksr-font-weight-semibold);
    line-height: 1;
    padding: 0.75em 1.5em;
    border-radius: var(--uksr-radius-sm);
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    border: 2px solid transparent;
    transition: background-color var(--uksr-transition-fast),
                color var(--uksr-transition-fast),
                border-color var(--uksr-transition-fast),
                box-shadow var(--uksr-transition-fast);
}

/* Primary — green */
.uksr-btn-primary {
    background-color: var(--uksr-green);
    color: var(--uksr-white);
}

.uksr-btn-primary:hover {
    background-color: var(--uksr-green-dark);
    color: var(--uksr-white);
    text-decoration: none;
}

/* Secondary — dark blue */
.uksr-btn-secondary {
    background-color: var(--uksr-dark-blue);
    color: var(--uksr-white);
}

.uksr-btn-secondary:hover {
    background-color: var(--uksr-dark-blue-light);
    color: var(--uksr-white);
    text-decoration: none;
}

/* Magenta — accent/CTA */
.uksr-btn-magenta {
    background-color: var(--uksr-magenta);
    color: var(--uksr-white);
}

.uksr-btn-magenta:hover {
    background-color: var(--uksr-magenta-dark);
    color: var(--uksr-white);
    text-decoration: none;
}

/* Outline — bordered, transparent */
.uksr-btn-outline {
    background-color: transparent;
    color: var(--uksr-dark-blue);
    border-color: var(--uksr-dark-blue);
}

.uksr-btn-outline:hover {
    background-color: var(--uksr-dark-blue);
    color: var(--uksr-white);
    text-decoration: none;
}

/* Size modifiers */
.uksr-btn-sm {
    font-size: var(--uksr-font-size-sm);
    padding: 0.5em 1em;
}

.uksr-btn-lg {
    font-size: var(--uksr-font-size-lg);
    padding: 1em 2em;
}

/* ================================================================
   5. CARDS
   ================================================================ */
.uksr-card {
    background: var(--uksr-white);
    border-radius: var(--uksr-radius-md);
    box-shadow: var(--uksr-shadow-sm);
    overflow: hidden;
    transition: box-shadow var(--uksr-transition-fast),
                transform var(--uksr-transition-fast);
}

.uksr-card:hover {
    box-shadow: var(--uksr-shadow-md);
}

.uksr-card__body {
    padding: var(--uksr-space-lg);
}

.uksr-card__body h3 {
    font-family: var(--uksr-font-primary);
    font-size: var(--uksr-font-size-lg);
    font-weight: var(--uksr-font-weight-bold);
    color: var(--uksr-dark-blue);
    margin-top: 0;
    margin-bottom: var(--uksr-space-sm);
}

.uksr-card__body p {
    color: var(--uksr-grey-700);
    line-height: var(--uksr-line-height-relaxed);
    margin-bottom: 0;
}

.uksr-card footer {
    padding: var(--uksr-space-md) var(--uksr-space-lg);
    border-top: 1px solid var(--uksr-grey-200);
}

.uksr-card footer a {
    color: var(--uksr-magenta);
    text-decoration: none;
    font-weight: var(--uksr-font-weight-semibold);
}

.uksr-card footer a:hover {
    color: var(--uksr-magenta-dark);
}

/* Card — image variant */
.uksr-card__image {
    overflow: hidden;
}

.uksr-card__image img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform var(--uksr-transition-slow);
}

.uksr-card--has-image:hover .uksr-card__image img {
    transform: scale(1.03);
}

/* Card — compact */
.uksr-card--compact .uksr-card__body {
    padding: var(--uksr-space-md);
}

/* Card — highlight (magenta top border) */
.uksr-card--highlight {
    border-top: 3px solid var(--uksr-magenta);
}

/* Card — step (numbered) */
.uksr-card--step {
    position: relative;
    padding-top: var(--uksr-space-xl);
}

.uksr-card--step::before {
    content: attr(data-step);
    position: absolute;
    top: calc(var(--uksr-space-md) * -1);
    left: var(--uksr-space-lg);
    width: 32px;
    height: 32px;
    background: var(--uksr-gradient-brand);
    color: var(--uksr-white);
    font-weight: var(--uksr-font-weight-bold);
    font-size: var(--uksr-font-size-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--uksr-radius-full);
}

/* Card — clickable link */
.uksr-card--link {
    cursor: pointer;
}

.uksr-card--link:hover {
    transform: translateY(-2px);
    box-shadow: var(--uksr-shadow-lg);
}

/* Card — accent gradient left border */
.uksr-card--accent-gradient {
    border-left: 4px solid transparent;
    border-image: var(--uksr-gradient-brand) 1;
}

/* ================================================================
   6. CARD GRIDS
   ================================================================ */
.uksr-card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--uksr-space-lg);
}

.uksr-card-grid--2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--uksr-space-lg);
}

.uksr-card-grid--4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--uksr-space-lg);
}

/* Responsive breakpoints */
@media (max-width: 1024px) {
    .uksr-card-grid--4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .uksr-card-grid {
        grid-template-columns: 1fr;
    }

    .uksr-card-grid--2 {
        grid-template-columns: 1fr;
    }

    .uksr-card-grid--4 {
        grid-template-columns: 1fr;
    }
}

/* ================================================================
   7. STEPPER / PROCESS STEPS
   ================================================================ */
.uksr-stepper {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: var(--uksr-space-lg);
    counter-reset: stepper;
}

.uksr-stepper--3-steps { grid-template-columns: repeat(3, 1fr); }
.uksr-stepper--4-steps { grid-template-columns: repeat(4, 1fr); }
.uksr-stepper--5-steps { grid-template-columns: repeat(5, 1fr); }

@media (max-width: 768px) {
    .uksr-stepper--3-steps,
    .uksr-stepper--4-steps,
    .uksr-stepper--5-steps {
        grid-template-columns: 1fr;
    }
}

.uksr-stepper__item {
    counter-increment: stepper;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.uksr-stepper__marker {
    width: 48px;
    height: 48px;
    background: var(--uksr-gradient-brand);
    color: var(--uksr-white);
    font-weight: var(--uksr-font-weight-bold);
    font-size: var(--uksr-font-size-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--uksr-radius-full);
    margin-bottom: var(--uksr-space-md);
    flex-shrink: 0;
}

.uksr-stepper__content {
    width: 100%;
}

.uksr-stepper__content h3 {
    font-family: var(--uksr-font-primary);
    font-size: var(--uksr-font-size-md);
    font-weight: var(--uksr-font-weight-bold);
    color: var(--uksr-dark-blue);
    margin-top: 0;
    margin-bottom: var(--uksr-space-xs);
}

.uksr-stepper__content p {
    color: var(--uksr-grey-600);
    font-size: var(--uksr-font-size-sm);
    margin-bottom: 0;
}

/* ================================================================
   8. COMPARISON PANELS
   ================================================================ */
.uksr-compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--uksr-space-lg);
}

@media (max-width: 768px) {
    .uksr-compare {
        grid-template-columns: 1fr;
    }
}

.uksr-compare__panel {
    background: var(--uksr-white);
    border-radius: var(--uksr-radius-md);
    padding: var(--uksr-space-lg);
    box-shadow: var(--uksr-shadow-sm);
}

.uksr-compare__panel h3 {
    font-family: var(--uksr-font-primary);
    font-weight: var(--uksr-font-weight-bold);
    color: var(--uksr-dark-blue);
    margin-top: 0;
    margin-bottom: var(--uksr-space-md);
}

.uksr-compare__panel ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.uksr-compare__item {
    padding: var(--uksr-space-sm) 0;
    border-bottom: 1px solid var(--uksr-grey-100);
    font-size: var(--uksr-font-size-base);
}

.uksr-compare__item:last-child {
    border-bottom: none;
}

.uksr-compare__panel--positive {
    border-top: 3px solid var(--uksr-green);
}

.uksr-compare__panel--negative {
    border-top: 3px solid var(--uksr-grey-400);
}

/* ================================================================
   9. SIBLING NAVIGATION
   ================================================================ */
.uksr-sibling-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--uksr-space-md);
}

.uksr-sibling-nav__item {
    display: block;
    padding: var(--uksr-space-md) var(--uksr-space-lg);
    background: var(--uksr-white);
    border-radius: var(--uksr-radius-md);
    box-shadow: var(--uksr-shadow-sm);
    text-decoration: none;
    border-left: 4px solid transparent;
    border-image: var(--uksr-gradient-brand) 1;
    transition: box-shadow var(--uksr-transition-fast),
                transform var(--uksr-transition-fast);
}

.uksr-sibling-nav__item:hover {
    box-shadow: var(--uksr-shadow-md);
    transform: translateY(-2px);
    text-decoration: none;
}

.uksr-sibling-nav__item h4 {
    font-family: var(--uksr-font-primary);
    font-size: var(--uksr-font-size-base);
    font-weight: var(--uksr-font-weight-bold);
    color: var(--uksr-dark-blue);
    margin: 0 0 var(--uksr-space-xs);
}

.uksr-sibling-nav__item p {
    font-size: var(--uksr-font-size-sm);
    color: var(--uksr-grey-600);
    margin: 0;
}