/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 6px var(--space-3);
    border: none;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    cursor: pointer;
    transition: background var(--transition-fast), box-shadow var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
    line-height: 20px;
}

.btn--primary {
    background: var(--color-brand-blue);
    color: white;
}

.btn--primary:hover {
    background: var(--color-brand-blue-hover);
}

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

.btn--secondary {
    background: var(--color-gray-200);
    color: var(--color-gray-900);
}

.btn--secondary:hover {
    background: var(--color-gray-300);
}

.btn--danger {
    background: #EB5A46;
    color: white;
}

.btn--danger:hover {
    background: #CF513D;
}

.btn--subtle {
    background: transparent;
    color: var(--color-gray-600);
}

.btn--subtle:hover {
    background: var(--color-gray-200);
    color: var(--color-gray-900);
}

.btn--block {
    display: flex;
    width: 100%;
}

.btn--sm {
    padding: 4px var(--space-2);
    font-size: var(--font-size-xs);
}

.btn--lg {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-md);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Form elements */
.form-group {
    margin-bottom: var(--space-3);
}

.form-label {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-700);
    margin-bottom: var(--space-1);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-input {
    width: 100%;
    padding: var(--space-2);
    background: var(--color-gray-50);
    border: 2px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--color-gray-900);
    transition: border-color var(--transition-fast), background var(--transition-fast);
}

.form-input:hover {
    background: var(--color-gray-200);
}

.form-input:focus {
    background: white;
    border-color: var(--color-brand-blue);
    outline: none;
    box-shadow: 0 0 0 1px var(--color-brand-blue);
}

.form-input--error {
    border-color: #EB5A46;
}

textarea.form-input {
    resize: vertical;
    min-height: 80px;
}

select.form-input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23505F79' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 8px center;
    padding-right: 28px;
}

/* Alerts */
.alert {
    padding: var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-3);
}

.alert--error {
    background: #FDECEA;
    color: #5F2120;
    border-left: 4px solid #EB5A46;
}

.alert--success {
    background: #EDF7ED;
    color: #1E4620;
    border-left: 4px solid #61BD4F;
}

.alert--warning {
    background: #FFF8E1;
    color: #663C00;
    border-left: 4px solid #F2D600;
}

.alert--info {
    background: #E8F4FD;
    color: #0B3C5D;
    border-left: 4px solid #0079BF;
}

.alert__list {
    margin: 0;
    padding-left: var(--space-4);
    list-style: disc;
}

/* Avatars */
.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-gray-400);
    color: white;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    user-select: none;
    flex-shrink: 0;
}

.avatar--xs {
    width: 24px;
    height: 24px;
    font-size: 10px;
}

.avatar--sm {
    width: 28px;
    height: 28px;
    font-size: var(--font-size-xs);
}

.avatar--md {
    width: 32px;
    height: 32px;
    font-size: var(--font-size-sm);
}

.avatar--lg {
    width: 40px;
    height: 40px;
    font-size: var(--font-size-md);
}

.avatar--xl {
    width: 48px;
    height: 48px;
    font-size: var(--font-size-lg);
}

.avatar img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
}

/* Popover/Dropdown */
.popover {
    position: absolute;
    top: 100%;
    width: 304px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-popover);
    z-index: var(--z-popover);
    overflow: hidden;
}

.popover--right {
    right: 0;
}

.popover--left {
    left: 0;
}

.popover__header {
    padding: var(--space-2) var(--space-3);
    text-align: center;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-600);
    border-bottom: 1px solid var(--color-gray-200);
    position: relative;
}

.popover__close {
    position: absolute;
    right: var(--space-2);
    top: 50%;
    transform: translateY(-50%);
}

.popover__body {
    padding: var(--space-3);
}

.popover__divider {
    border: none;
    border-top: 1px solid var(--color-gray-200);
    margin: var(--space-2) 0;
}

.popover__user-info {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
}

.popover__user-name {
    font-weight: var(--font-weight-bold);
    font-size: var(--font-size-sm);
}

.popover__user-email {
    font-size: var(--font-size-xs);
    color: var(--color-gray-600);
}

.popover__link {
    display: block;
    padding: var(--space-2) 0;
    color: var(--color-gray-900);
    font-size: var(--font-size-sm);
    text-decoration: none;
    cursor: pointer;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
}

.popover__link:hover {
    color: var(--color-brand-blue);
    text-decoration: underline;
}

.popover__link--danger {
    color: #EB5A46;
}

.popover__link--danger:hover {
    color: #CF513D;
}

.popover__form {
    margin: 0;
}

/* Badge */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 2px;
    padding: 2px var(--space-1);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-normal);
    line-height: 16px;
}

.badge--due {
    background: var(--color-gray-200);
    color: var(--color-gray-600);
}

.badge--due-soon {
    background: #F2D600;
    color: var(--color-gray-900);
}

.badge--overdue {
    background: #EB5A46;
    color: white;
}

.badge--complete {
    background: #61BD4F;
    color: white;
}

/* Toast notifications */
.toast-container {
    position: fixed;
    bottom: var(--space-4);
    left: var(--space-4);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column-reverse;
    gap: var(--space-2);
    pointer-events: none;
}

.toast {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: white;
    box-shadow: var(--shadow-modal);
    transform: translateX(-100%);
    opacity: 0;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    pointer-events: auto;
    max-width: 400px;
}

.toast--visible {
    transform: translateX(0);
    opacity: 1;
}

.toast--info {
    background: #0079BF;
}

.toast--success {
    background: #61BD4F;
}

.toast--error {
    background: #EB5A46;
}

.toast--warning {
    background: #F2D600;
    color: var(--color-gray-900);
}

/* Label chips */
.label-chip {
    display: inline-block;
    height: 8px;
    min-width: 40px;
    border-radius: 4px;
}

.label-chip--expanded {
    height: 16px;
    padding: 0 var(--space-2);
    font-size: var(--font-size-xs);
    line-height: 16px;
    color: white;
    font-weight: var(--font-weight-bold);
    border-radius: var(--radius-sm);
}

/* Inline edit */
.inline-edit-input {
    width: 100%;
    padding: var(--space-1);
    border: 2px solid var(--color-brand-blue);
    border-radius: var(--radius-sm);
    font-size: inherit;
    font-weight: inherit;
    background: white;
    resize: none;
}

/* Loading spinner */
.spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-gray-300);
    border-top-color: var(--color-brand-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Progress bar */
.progress-bar {
    height: 8px;
    background: var(--color-gray-300);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar__fill {
    height: 100%;
    background: var(--color-brand-blue);
    border-radius: 4px;
    transition: width var(--transition-normal);
}

.progress-bar__fill--success {
    background: #61BD4F;
}

/* Separator */
hr.separator {
    border: none;
    border-top: 1px solid var(--color-gray-200);
    margin: var(--space-4) 0;
}