/* ===== OpsArena Brand Kit page ===== */
/* Extend :root for trainer demo (semantic colors not in landing.css) */
.bk-body {
    padding-top: 0;
}
.bk-body .bk-color--success .bk-color__swatch { border-color: rgba(34, 197, 94, 0.3); }
.bk-body .bk-color--danger .bk-color__swatch { border-color: rgba(239, 68, 68, 0.3); }

.bk-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(17, 17, 20, 0.85);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.bk-header__inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 14px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.bk-header__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.bk-header__logo svg {
    width: 32px;
    height: 38px;
    display: block;
}

.bk-header__back {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    transition: color 0.2s ease;
}

.bk-header__back:hover {
    color: var(--color-text);
}

.bk-main {
    padding-bottom: 80px;
}

.bk-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero */
.bk-hero {
    padding: 64px 0 48px;
    border-bottom: 1px solid var(--color-border);
}

.bk-hero__title {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    margin-bottom: 8px;
    color: var(--color-text);
}

.bk-hero__desc {
    font-size: 1rem;
    color: var(--color-text-muted);
}

/* Section */
.bk-section {
    padding: 48px 0;
    border-bottom: 1px solid var(--color-border);
}

.bk-section__title {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
    color: var(--color-text);
}

.bk-section__desc {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-bottom: 28px;
    max-width: 560px;
}

.bk-subtitle {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin: 24px 0 12px;
}

.bk-section__note {
    font-size: 0.8125rem;
    color: var(--color-text-dim);
    margin-top: 16px;
    max-width: 560px;
}

.bk-section__note code {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    padding: 2px 6px;
    background: var(--color-bg-elevated);
    border-radius: var(--radius-xs);
}

.bk-spacing-list {
    list-style: none;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.7;
}

.bk-spacing-list li {
    margin-bottom: 8px;
}

.bk-spacing-list code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--color-brand);
}

/* Logo showcase */
.bk-logo-showcase {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    align-items: flex-start;
}

.bk-logo-item {
    flex: 0 0 auto;
}

.bk-logo-item__preview {
    width: 280px;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 24px;
}

.bk-logo-item--dark .bk-logo-item__preview {
    background: var(--color-bg);
}

.bk-logo-item__preview--lockup {
    display: flex;
    align-items: center;
    gap: 14px;
}

.bk-logo-wordmark {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.bk-logo-item--icon .bk-logo-item__preview {
    width: 140px;
    min-height: 140px;
}

.bk-logo-full {
    max-width: 100%;
    height: auto;
}

.bk-logo-item__label {
    margin-top: 12px;
    font-size: 0.8125rem;
    color: var(--color-text-dim);
}

/* Colors */
.bk-colors {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 20px;
}

.bk-color {
    --bk-swatch: #111114;
}

.bk-color__swatch {
    display: block;
    height: 72px;
    background: var(--bk-swatch);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xs);
    margin-bottom: 10px;
}

.bk-color--brand .bk-color__swatch {
    border-color: rgba(45, 212, 191, 0.3);
}

.bk-color__name {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 2px;
}

.bk-color__hex {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-text-dim);
}

/* Typography */
.bk-type {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.bk-type__row {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.bk-type__label {
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-text-dim);
}

.bk-type__sample {
    font-size: 1rem;
    color: var(--color-text);
}

.bk-type__sample--h1 {
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.bk-type__sample--h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.bk-type__sample--mono {
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    color: var(--color-brand);
}

/* Components */
.bk-components {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    align-items: flex-end;
}

.bk-comp-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.bk-comp-group__label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

/* Trainer button demos (style.css not loaded on brand page) */
.bk-components--trainer {
    align-items: center;
}

.bk-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.875rem;
    font-family: var(--font-sans);
    transition: all 0.2s ease;
    white-space: nowrap;
    border: none;
    cursor: pointer;
}

.bk-btn--primary {
    background: var(--color-text);
    color: var(--color-bg);
}

.bk-btn--ghost {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}

.bk-btn--danger {
    background: transparent;
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.25);
}

.bk-stat-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
}

.bk-stat-badge svg {
    width: 12px;
    height: 12px;
    opacity: 0.5;
}

/* Feature card demo uses .l-feature-card from landing.css */
.bk-feature-card-demo {
    margin-top: 8px;
}

.bk-feature-card-demo .l-feature-card {
    max-width: 320px;
}

/* Lesson card demos (trainer) */
.bk-lesson-cards {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 12px;
}

.bk-lesson-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    min-width: 140px;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

.bk-lesson-card--current {
    border-color: var(--color-border-hover);
    background: var(--color-bg-card);
}

.bk-lesson-card--completed {
    border-color: rgba(34, 197, 94, 0.25);
    background: rgba(34, 197, 94, 0.06);
}

.bk-lesson-card--completed .bk-lesson-card__title { color: var(--color-text-secondary); }

.bk-lesson-card--locked {
    opacity: 0.7;
}

.bk-lesson-card__num {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-dim);
}

.bk-lesson-card__title {
    color: var(--color-text);
    font-weight: 500;
}

/* Modal demo */
.bk-modal-demo {
    margin-top: 16px;
}

.bk-modal-preview {
    max-width: 360px;
    background: linear-gradient(180deg, var(--color-bg-elevated) 0%, #16161a 100%);
    border: 1px solid rgba(45, 212, 191, 0.22);
    border-radius: var(--radius);
    padding: 0 24px 24px;
    box-shadow: 0 0 0 1px rgba(45, 212, 191, 0.06), 0 24px 48px rgba(0, 0, 0, 0.4);
}

.bk-modal-preview__bar {
    height: 4px;
    margin: 0 -24px 20px -24px;
    background: linear-gradient(90deg, #1f8a7a 0%, var(--color-brand) 50%, #28b8a0 100%);
    border-radius: var(--radius) var(--radius) 0 0;
}

.bk-modal-preview__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.bk-modal-preview__brand svg {
    width: 32px;
    height: 38px;
    display: block;
}

.bk-modal-preview__title {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    margin-bottom: 6px;
    color: var(--color-text);
}

.bk-modal-preview__desc {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.55;
    margin-bottom: 16px;
}

.bk-modal-preview__input {
    padding: 12px 16px;
    font-size: 0.875rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xs);
    color: var(--color-text-dim);
}

.bk-modal-preview__submit {
    width: 100%;
    margin-top: 16px;
    padding: 12px 24px;
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: var(--font-sans);
    color: #111114;
    background: var(--color-brand);
    border: none;
    border-radius: var(--radius-xs);
    cursor: pointer;
}

.bk-btn-brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 11px 24px;
    font-size: 0.875rem;
    font-weight: 500;
    font-family: var(--font-sans);
    color: #111114;
    background: var(--color-brand);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.2s ease, box-shadow 0.2s ease;
}

.bk-btn-brand:hover {
    background: #26bfb5;
    box-shadow: 0 0 20px rgba(45, 212, 191, 0.3);
}

/* Radius demo */
.bk-radius-demo {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.bk-radius-box {
    width: 100px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    font-size: 0.8125rem;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
}

.bk-radius-box--xs {
    border-radius: var(--radius-xs);
}

.bk-radius-box--sm {
    border-radius: var(--radius-sm);
}

.bk-radius-box--md {
    border-radius: var(--radius);
}

/* Footer section */
.bk-section--foot {
    border-bottom: none;
    padding: 32px 0;
}

.bk-foot__copy {
    font-size: 0.8125rem;
    color: var(--color-text-dim);
    margin-bottom: 8px;
}

.bk-foot__link {
    font-size: 0.8125rem;
    color: var(--color-brand);
}

.bk-foot__link:hover {
    text-decoration: underline;
}

@media (max-width: 640px) {
    .bk-logo-item__preview {
        width: 100%;
        min-height: 80px;
    }
    .bk-logo-item--icon .bk-logo-item__preview {
        width: 120px;
        min-height: 120px;
    }
    .bk-colors {
        grid-template-columns: repeat(2, 1fr);
    }
}