.cos-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--cos-space-2);
    min-height: 36px;
    padding: 0 var(--cos-space-3);
    border: 1px solid transparent;
    border-radius: var(--cos-radius-sm);
    background: var(--cos-color-surface);
    color: var(--cos-color-text);
    font-size: var(--cos-font-size-sm);
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
    transition: all 0.16s ease;
}

.cos-btn:hover,
.cos-btn:focus-visible {
    text-decoration: none;
}

.cos-btn:disabled,
.cos-btn.is-disabled {
    opacity: 0.55;
    pointer-events: none;
}

.cos-btn-primary {
    background: var(--cos-color-primary);
    border-color: var(--cos-color-primary);
    color: #fff;
}

.cos-btn-primary:hover,
.cos-btn-primary:focus-visible {
    background: var(--cos-color-primary-hover);
    border-color: var(--cos-color-primary-hover);
    color: #fff;
}

.cos-btn-secondary {
    background: var(--cos-color-secondary);
    border-color: var(--cos-color-secondary);
    color: #fff;
}

.cos-btn-secondary:hover,
.cos-btn-secondary:focus-visible {
    background: var(--cos-color-secondary-hover);
    border-color: var(--cos-color-secondary-hover);
    color: #fff;
}

.cos-btn-outline {
    background: transparent;
    border-color: var(--cos-color-border);
}

.cos-btn-ghost {
    background: transparent;
    border-color: transparent;
}

.cos-btn-danger {
    background: var(--cos-color-danger);
    border-color: var(--cos-color-danger);
    color: #fff;
}

.cos-btn-sm {
    min-height: 30px;
    padding: 0 var(--cos-space-2);
    font-size: var(--cos-font-size-xs);
}

.cos-btn-lg {
    min-height: 42px;
    padding: 0 var(--cos-space-4);
    font-size: var(--cos-font-size-md);
}

.cos-btn-icon {
    width: 36px;
    min-width: 36px;
    padding: 0;
}

.cos-field {
    display: grid;
    gap: var(--cos-space-2);
    min-width: 0;
}

.cos-label {
    font-size: var(--cos-font-size-sm);
    font-weight: 600;
    color: var(--cos-color-text);
}

.cos-input,
.cos-textarea,
.cos-select {
    width: 100%;
    max-width: 100%;
    min-height: 36px;
    padding: 0 var(--cos-space-3);
    border: 1px solid var(--cos-color-border);
    border-radius: var(--cos-radius-sm);
    background: var(--cos-color-surface);
    color: var(--cos-color-text);
}

.cos-textarea {
    min-height: 84px;
    padding-top: var(--cos-space-2);
    padding-bottom: var(--cos-space-2);
    resize: vertical;
}

.cos-select {
    appearance: none;
    background-image: linear-gradient(45deg, transparent 50%, var(--cos-color-text-muted) 50%), linear-gradient(135deg, var(--cos-color-text-muted) 50%, transparent 50%);
    background-position: calc(100% - 16px) calc(50% - 2px), calc(100% - 10px) calc(50% - 2px);
    background-size: 6px 6px, 6px 6px;
    background-repeat: no-repeat;
    padding-right: 36px;
}

.cos-checkbox,
.cos-radio {
    width: 16px;
    height: 16px;
    accent-color: var(--cos-color-primary);
}

.cos-field-help {
    color: var(--cos-color-text-muted);
    font-size: var(--cos-font-size-xs);
}

.cos-field-error {
    color: var(--cos-color-danger);
    font-size: var(--cos-font-size-xs);
}

.cos-card {
    display: grid;
    gap: var(--cos-space-3);
}

.cos-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--cos-space-2);
}

.cos-card-title {
    margin: 0;
    font-size: var(--cos-font-size-md);
    font-weight: 700;
}

.cos-card-content {
    min-width: 0;
}

.cos-kpi-card {
    padding: var(--cos-space-4);
    border-radius: var(--cos-radius-md);
    border: 1px solid var(--cos-color-border);
    background: var(--cos-color-surface);
}

.cos-kpi-value {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.2;
}

.cos-kpi-label {
    margin-top: var(--cos-space-1);
    color: var(--cos-color-text-muted);
    font-size: var(--cos-font-size-sm);
}

.cos-badge-primary { background: rgba(15, 108, 191, 0.12); color: var(--cos-color-primary); }
.cos-badge-success { background: rgba(31, 157, 85, 0.12); color: var(--cos-color-success); }
.cos-badge-warning { background: rgba(217, 119, 6, 0.14); color: var(--cos-color-warning); }
.cos-badge-danger { background: rgba(220, 38, 38, 0.12); color: var(--cos-color-danger); }
.cos-badge-muted { background: var(--cos-color-surface-muted); color: var(--cos-color-text-muted); }

.cos-dropdown {
    position: relative;
    display: inline-block;
}

.cos-dropdown-menu {
    position: absolute;
    right: 0;
    top: calc(100% + 6px);
    z-index: var(--cos-z-dropdown);
    min-width: 180px;
    padding: var(--cos-space-2);
    border: 1px solid var(--cos-color-border);
    border-radius: var(--cos-radius-md);
    background: var(--cos-color-surface);
    box-shadow: var(--cos-shadow-md);
    display: none;
}

.cos-dropdown.is-open .cos-dropdown-menu {
    display: block;
}

.cos-dropdown-item {
    display: flex;
    width: 100%;
    align-items: center;
    gap: var(--cos-space-2);
    padding: var(--cos-space-2) var(--cos-space-2);
    border-radius: var(--cos-radius-sm);
    color: var(--cos-color-text);
    text-decoration: none;
    background: transparent;
    border: 0;
    text-align: left;
}

.cos-dropdown-item:hover,
.cos-dropdown-item:focus-visible {
    background: var(--cos-color-surface-muted);
}

.cos-modal,
.cos-drawer {
    position: fixed;
    inset: 0;
    display: none;
}

.cos-modal { z-index: var(--cos-z-modal); }
.cos-drawer { z-index: var(--cos-z-drawer); }

.cos-modal.is-open,
.cos-drawer.is-open {
    display: block;
}

.cos-modal::before,
.cos-drawer::before {
    content: "";
    position: absolute;
    inset: 0;
    background: var(--cos-color-overlay);
}

body.is-modal-open {
    overflow: hidden;
    touch-action: none;
}

body.is-drawer-open {
    overflow: hidden;
    touch-action: none;
}

.cos-modal-dialog {
    position: relative;
    z-index: 1;
    max-width: 560px;
    margin: 8vh auto;
    background: var(--cos-color-surface);
    border: 1px solid var(--cos-color-border);
    border-radius: var(--cos-radius-lg);
    box-shadow: var(--cos-shadow-lg);
    overflow: hidden;
    max-height: 84vh;
}

.cos-modal-header,
.cos-modal-body,
.cos-modal-footer {
    padding: var(--cos-space-4);
}

.cos-modal-header {
    border-bottom: 1px solid var(--cos-color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--cos-space-2);
}

.cos-modal-footer {
    border-top: 1px solid var(--cos-color-border);
    display: flex;
    justify-content: flex-end;
    gap: var(--cos-space-2);
}

.cos-drawer-panel {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: min(90vw, 420px);
    background: var(--cos-color-surface);
    border-left: 1px solid var(--cos-color-border);
    box-shadow: var(--cos-shadow-lg);
    transform: translateX(100%);
    transition: transform 0.18s ease;
    z-index: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    max-height: 100vh;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

.cos-drawer.is-open .cos-drawer-panel {
    transform: translateX(0);
}

.cos-demo-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--cos-space-3);
}

@media (max-width: 991.98px) {
    .cos-demo-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 767.98px) {
    .cos-btn,
    .cos-input,
    .cos-select,
    .cos-textarea {
        min-height: 40px;
    }

    .cos-modal-dialog {
        margin: 0;
        max-width: 100%;
        min-height: 100%;
        max-height: 100%;
        border-radius: 0;
    }

    .cos-drawer-panel {
        width: 100%;
        max-width: 100%;
        border-left: 0;
    }

    .cos-demo-grid {
        grid-template-columns: 1fr;
    }
}