/* ============================================================
   Shared UI Components — Precision System
   Clean, flat, restrained. Every element is functional.
   ============================================================ */

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 6px 14px;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    font-family: var(--font-family);
    cursor: pointer;
    transition:
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
    height: 32px;
    text-decoration: none;
    line-height: 1;
    position: relative;
}

.btn[disabled],
.btn[aria-disabled="true"] {
    opacity: 0.4;
    pointer-events: none;
}

.btn.is-loading {
    color: transparent;
    pointer-events: none;
}

.btn.is-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 1.5px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: btn-spin 0.5s linear infinite;
}

@keyframes btn-spin {
    to { transform: rotate(360deg); }
}

.btn-primary {
    background-color: var(--color-primary);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--color-primary-light);
    box-shadow: var(--shadow-sm);
}

.btn-primary:active {
    background-color: var(--color-primary-dark);
}

.btn-primary:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn-primary.is-loading::after {
    border-color: #ffffff;
    border-right-color: transparent;
}

.btn-secondary {
    background-color: var(--color-grey-100);
    color: var(--color-grey-700);
}

.btn-secondary:hover {
    background-color: var(--color-grey-200);
}

.btn-danger {
    background-color: var(--color-error);
    color: #ffffff;
}

.btn-danger:hover {
    opacity: 0.9;
}

.btn-ghost {
    background: transparent;
    color: var(--color-grey-700);
    border-color: var(--color-grey-200);
}

.btn-ghost:hover {
    background: var(--color-grey-50);
    border-color: var(--color-grey-300);
}

.btn-sm {
    padding: 4px 8px;
    font-size: var(--font-size-xs);
    height: 26px;
    border-radius: var(--radius);
}

.btn-full {
    width: 100%;
}

.btn-icon {
    padding: var(--space-2);
    min-width: var(--tap-target-min);
    border-radius: var(--radius);
}

/* ---- Forms ---- */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.form-group label {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-grey-500);
}

.form-group input,
.form-group select {
    width: 100%;
    min-width: 0;
    box-sizing: border-box;
    padding: 0 10px;
    height: 32px;
    border: 1px solid var(--color-grey-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-grey-900);
    background: var(--color-surface);
    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
}

.form-group textarea {
    width: 100%;
    min-width: 0;
    box-sizing: border-box;
    padding: 6px 10px;
    border: 1px solid var(--color-grey-200);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-grey-900);
    background: var(--color-surface);
    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
}

.form-group input:hover,
.form-group select:hover,
.form-group textarea:hover {
    border-color: var(--color-grey-300);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(45, 106, 79, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--color-grey-300);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* ---- Alerts ---- */
.alert {
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-4);
    border: 1px solid;
}

.alert-error {
    background-color: rgba(220, 38, 38, 0.05);
    color: var(--color-error);
    border-color: rgba(220, 38, 38, 0.15);
}

.alert-success {
    background-color: rgba(22, 163, 74, 0.05);
    color: var(--color-success);
    border-color: rgba(22, 163, 74, 0.15);
}

.alert-warning {
    background-color: rgba(217, 119, 6, 0.05);
    color: var(--color-warning);
    border-color: rgba(217, 119, 6, 0.15);
}

.alert-info {
    background-color: rgba(37, 99, 235, 0.05);
    color: var(--color-info);
    border-color: rgba(37, 99, 235, 0.15);
}

/* ---- Cards ---- */
.card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-grey-100);
    padding: var(--space-6);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
}

.card-header h2,
.card-header h3 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin: 0;
}

/* ---- Tables ---- */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.table {
    width: 100%;
    text-align: left;
}

.table th {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-grey-500);
    padding: var(--space-2) var(--space-3);
    border-bottom: 1px solid var(--color-grey-200);
}

.table td {
    padding: var(--space-3);
    border-bottom: 1px solid var(--color-grey-100);
    vertical-align: middle;
    font-size: var(--font-size-sm);
}

.table tbody tr {
    transition: background-color var(--transition-fast);
}

.table tbody tr:hover {
    background-color: var(--color-grey-50);
}

/* ---- Badges ---- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: var(--radius);
    line-height: 1.5;
}

.badge-success {
    background-color: rgba(22, 163, 74, 0.08);
    color: var(--color-success);
}

.badge-warning {
    background-color: rgba(217, 119, 6, 0.08);
    color: var(--color-warning);
}

.badge-error {
    background-color: rgba(220, 38, 38, 0.08);
    color: var(--color-error);
}

.badge-info {
    background-color: rgba(37, 99, 235, 0.08);
    color: var(--color-info);
}

/* ---- Empty State ---- */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-12) var(--space-8);
    color: var(--color-grey-500);
}

.empty-state svg {
    width: 40px;
    height: 40px;
    margin-bottom: var(--space-3);
    opacity: 0.3;
}

.empty-state h3 {
    font-size: var(--font-size-base);
    font-weight: 500;
    color: var(--color-grey-700);
    margin-bottom: var(--space-1);
}

.empty-state p {
    font-size: var(--font-size-sm);
    max-width: 300px;
    line-height: 1.5;
}

/* ---- Divider ---- */
.divider {
    height: 1px;
    background: var(--color-grey-100);
    border: none;
    margin: var(--space-6) 0;
}

/* ---- Utility ---- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.text-muted {
    color: var(--color-grey-500);
}

.text-sm {
    font-size: var(--font-size-sm);
}