/**
 * UniStudy Design System — shared tokens & UI primitives
 * Load after Bootstrap. RTL via [dir="rtl"] — no separate RTL file.
 */
:root {
    --uni-brand: #2563eb;
    --uni-brand-dark: #1d4ed8;
    --uni-accent: #f59e0b;
    --uni-success: #16a34a;
    --uni-success-bg: #f0fdf4;
    --uni-success-border: #86efac;
    --uni-error: #dc2626;
    --uni-error-bg: #fef2f2;
    --uni-error-border: #fca5a5;
    --uni-warning: #d97706;
    --uni-warning-bg: #fffbeb;
    --uni-warning-border: #fcd34d;
    --uni-info: #0284c7;
    --uni-info-bg: #f0f9ff;
    --uni-info-border: #7dd3fc;
    --uni-text: #0f172a;
    --uni-text-muted: #64748b;
    --uni-surface: #ffffff;
    --uni-surface-2: #f8fafc;
    --uni-border: #e2e8f0;
    --uni-radius-sm: 0.375rem;
    --uni-radius: 0.625rem;
    --uni-radius-lg: 1rem;
    --uni-shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
    --uni-shadow: 0 4px 16px rgba(15, 23, 42, 0.08);
    --uni-shadow-lg: 0 12px 32px rgba(15, 23, 42, 0.12);
    --uni-spacing-xs: 0.25rem;
    --uni-spacing-sm: 0.5rem;
    --uni-spacing: 1rem;
    --uni-spacing-lg: 1.5rem;
    --uni-spacing-xl: 2rem;
    --uni-font: 'Cairo', 'Tajawal', system-ui, sans-serif;
    --uni-transition: 0.2s ease;
    --uni-focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.35);
    --uni-toast-z: 10900;
}

/* Logical property helpers */
.text-start { text-align: start; }
.text-end { text-align: end; }
[dir="rtl"] .ms-auto { margin-inline-start: auto !important; margin-left: unset !important; }
[dir="ltr"] .ms-auto { margin-left: auto !important; }
[dir="rtl"] .me-auto { margin-inline-end: auto !important; margin-right: unset !important; }
[dir="ltr"] .me-auto { margin-right: auto !important; }

/* ========== Alerts ========== */
.uni-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--uni-spacing-sm);
    padding: var(--uni-spacing) var(--uni-spacing-lg);
    border-radius: var(--uni-radius);
    border: 1px solid transparent;
    margin-bottom: var(--uni-spacing);
    font-family: var(--uni-font);
    animation: uni-ds-fade-in 0.3s ease both;
}
.uni-alert__icon {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    margin-top: 0.1rem;
}
.uni-alert__body { flex: 1; min-width: 0; }
.uni-alert__title {
    font-weight: 700;
    font-size: 0.95rem;
    margin: 0 0 0.25rem;
    color: inherit;
}
.uni-alert__message {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.55;
    word-break: break-word;
}
.uni-alert__list {
    margin: 0.25rem 0 0;
    padding-inline-start: 1.25rem;
    font-size: 0.9rem;
}
.uni-alert__close {
    flex-shrink: 0;
    background: transparent;
    border: none;
    padding: 0.25rem;
    cursor: pointer;
    opacity: 0.6;
    line-height: 1;
    color: inherit;
    border-radius: var(--uni-radius-sm);
}
.uni-alert__close:hover { opacity: 1; }
.uni-alert__close:focus-visible { outline: none; box-shadow: var(--uni-focus-ring); }

.uni-alert--success {
    background: var(--uni-success-bg);
    border-color: var(--uni-success-border);
    color: #14532d;
}
.uni-alert--success .uni-alert__icon { color: var(--uni-success); }

.uni-alert--error {
    background: var(--uni-error-bg);
    border-color: var(--uni-error-border);
    color: #7f1d1d;
}
.uni-alert--error .uni-alert__icon { color: var(--uni-error); }

.uni-alert--warning {
    background: var(--uni-warning-bg);
    border-color: var(--uni-warning-border);
    color: #78350f;
}
.uni-alert--warning .uni-alert__icon { color: var(--uni-warning); }

.uni-alert--info {
    background: var(--uni-info-bg);
    border-color: var(--uni-info-border);
    color: #0c4a6e;
}
.uni-alert--info .uni-alert__icon { color: var(--uni-info); }

/* Legacy uni-form-feedback alias */
.uni-form-feedback {
    display: flex;
    align-items: flex-start;
    gap: var(--uni-spacing-sm);
    padding: var(--uni-spacing) var(--uni-spacing-lg);
    border-radius: var(--uni-radius);
    margin-bottom: var(--uni-spacing);
    animation: uni-ds-fade-in 0.3s ease both;
}
.uni-form-feedback__badge {
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1rem;
}
.uni-form-feedback__content { flex: 1; min-width: 0; }
.uni-form-feedback__title { font-weight: 700; margin: 0 0 0.25rem; font-size: 0.95rem; }
.uni-form-feedback__message { margin: 0; font-size: 0.9rem; line-height: 1.55; }
.uni-form-feedback__list { margin: 0.25rem 0 0; padding-inline-start: 1.25rem; }
.uni-form-feedback--error {
    background: var(--uni-error-bg);
    border: 1px solid var(--uni-error-border);
    color: #7f1d1d;
}
.uni-form-feedback--error .uni-form-feedback__badge { background: var(--uni-error); color: #fff; }
.uni-form-feedback--success {
    background: var(--uni-success-bg);
    border: 1px solid var(--uni-success-border);
    color: #14532d;
}
.uni-form-feedback--success .uni-form-feedback__badge { background: var(--uni-success); color: #fff; }

/* ========== Buttons ========== */
.uni-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.55rem 1.25rem;
    font-family: var(--uni-font);
    font-weight: 600;
    font-size: 0.9rem;
    line-height: 1.4;
    border-radius: var(--uni-radius);
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: background var(--uni-transition), border-color var(--uni-transition), opacity var(--uni-transition), transform var(--uni-transition);
    white-space: nowrap;
}
.uni-btn:focus-visible { outline: none; box-shadow: var(--uni-focus-ring); }
.uni-btn:disabled,
.uni-btn.is-loading {
    opacity: 0.72;
    cursor: not-allowed;
    pointer-events: none;
}
.uni-btn--primary {
    background: var(--uni-brand);
    color: #fff;
    border-color: var(--uni-brand);
}
.uni-btn--primary:hover:not(:disabled) { background: var(--uni-brand-dark); border-color: var(--uni-brand-dark); color: #fff; }
.uni-btn--secondary {
    background: var(--uni-surface-2);
    color: var(--uni-text);
    border-color: var(--uni-border);
}
.uni-btn--secondary:hover:not(:disabled) { background: var(--uni-border); color: var(--uni-text); }
.uni-btn--danger {
    background: var(--uni-error);
    color: #fff;
    border-color: var(--uni-error);
}
.uni-btn--sm { padding: 0.35rem 0.85rem; font-size: 0.82rem; }
.uni-btn--lg { padding: 0.7rem 1.5rem; font-size: 1rem; }
.uni-btn__spinner {
    width: 1em;
    height: 1em;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: uni-ds-spin 0.65s linear infinite;
}

/* ========== Cards ========== */
.uni-card {
    background: var(--uni-surface);
    border: 1px solid var(--uni-border);
    border-radius: var(--uni-radius-lg);
    box-shadow: var(--uni-shadow-sm);
    overflow: hidden;
}
.uni-card__header {
    padding: var(--uni-spacing) var(--uni-spacing-lg);
    border-bottom: 1px solid var(--uni-border);
    background: var(--uni-surface-2);
}
.uni-card__title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--uni-text);
}
.uni-card__body { padding: var(--uni-spacing-lg); }

/* ========== Page header ========== */
.uni-page-header {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--uni-spacing);
    margin-bottom: var(--uni-spacing-lg);
}
.uni-page-header__title {
    margin: 0;
    font-size: clamp(1.25rem, 2.5vw, 1.65rem);
    font-weight: 800;
    color: var(--uni-text);
    line-height: 1.3;
}
.uni-page-header__desc {
    margin: 0.35rem 0 0;
    font-size: 0.92rem;
    color: var(--uni-text-muted);
    max-width: 52ch;
}
.uni-page-header__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
}

/* ========== Form actions ========== */
.uni-form-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    align-items: center;
    margin-top: var(--uni-spacing-lg);
    padding-top: var(--uni-spacing);
    border-top: 1px solid var(--uni-border);
}

/* ========== Empty state ========== */
.uni-empty-state {
    text-align: center;
    padding: var(--uni-spacing-xl) var(--uni-spacing);
    color: var(--uni-text-muted);
}
.uni-empty-state__icon {
    font-size: 2.5rem;
    color: var(--uni-border);
    margin-bottom: var(--uni-spacing);
}
.uni-empty-state__title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--uni-text);
    margin: 0 0 0.5rem;
}
.uni-empty-state__text {
    margin: 0 0 var(--uni-spacing-lg);
    font-size: 0.92rem;
    max-width: 36ch;
    margin-inline: auto;
}
.uni-empty-state__action { margin-top: var(--uni-spacing); }

/* ========== Skeleton ========== */
.uni-skeleton {
    display: grid;
    gap: 0.65rem;
}
.uni-skeleton__row {
    display: grid;
    gap: 0.65rem;
    grid-template-columns: repeat(var(--uni-skeleton-cols, 4), 1fr);
}
.uni-skeleton__cell {
    height: 1rem;
    border-radius: var(--uni-radius-sm);
    background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
    background-size: 200% 100%;
    animation: uni-ds-shimmer 1.4s ease infinite;
}
.uni-skeleton__cell--tall { height: 2.5rem; }
.uni-skeleton__cell--wide { grid-column: span 2; }

@media (max-width: 767.98px) {
    .uni-skeleton__row { grid-template-columns: 1fr 1fr; }
    .uni-page-header { flex-direction: column; }
}

/* ========== Locale switcher ========== */
.uni-locale-switcher {
    display: inline-flex;
    align-items: center;
    gap: 0.15rem;
    padding: 0.2rem;
    background: var(--uni-surface-2);
    border: 1px solid var(--uni-border);
    border-radius: 999px;
}
.uni-locale-switcher__btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.65rem;
    font-size: 0.78rem;
    font-weight: 600;
    border-radius: 999px;
    text-decoration: none;
    color: var(--uni-text-muted);
    border: none;
    background: transparent;
    transition: background var(--uni-transition), color var(--uni-transition);
}
.uni-locale-switcher__btn:hover { color: var(--uni-text); text-decoration: none; }
.uni-locale-switcher__btn.is-active {
    background: var(--uni-brand);
    color: #fff;
}

/* Breadcrumb */
.uni-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.85rem;
    margin-bottom: var(--uni-spacing);
}
.uni-breadcrumb__link {
    color: var(--uni-brand);
    text-decoration: none;
}
.uni-breadcrumb__link:hover { text-decoration: underline; }
.uni-breadcrumb__current { color: var(--uni-text-muted); font-weight: 600; }
.uni-breadcrumb__sep { color: var(--uni-text-muted); font-size: 0.75rem; }

/* Confirm modal */
.uni-confirm-modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 11000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--uni-spacing);
    background: rgba(15, 23, 42, 0.45);
}
.uni-confirm-modal-overlay.is-active { display: flex; }
.uni-confirm-modal {
    width: min(420px, 100%);
    padding: var(--uni-spacing-lg);
    text-align: center;
}
.uni-confirm-modal__icon {
    font-size: 2rem;
    color: var(--uni-warning);
    margin-bottom: var(--uni-spacing-sm);
}
.uni-confirm-modal__title {
    margin: 0 0 0.5rem;
    font-size: 1.1rem;
    font-weight: 700;
}
.uni-confirm-modal__text {
    margin: 0 0 var(--uni-spacing);
    color: var(--uni-text-muted);
    font-size: 0.92rem;
}
.uni-confirm-modal__actions {
    justify-content: center;
}

/* ========== Animations ========== */
@keyframes uni-ds-fade-in {
    from { opacity: 0; transform: translateY(-6px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes uni-ds-spin {
    to { transform: rotate(360deg); }
}
@keyframes uni-ds-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
    .uni-alert,
    .uni-form-feedback,
    .uni-btn,
    .uni-skeleton__cell { animation: none !important; transition: none !important; }
}