/**
 * CommerceForge Component System (Phase UI-01: Premium Commerce OS)
 *
 * Reusable, accessible UI components adhering strictly to design tokens.
 *
 * @author Jyotirmay Ray <https://jyotirmayray.in/>
 */

/* =============================================================================
 * 1. BUTTON SYSTEM
 * ========================================================================== */
.cf-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--cf-space-8);
    font-family: var(--cf-font-sans);
    font-size: var(--cf-font-size-body-sm);
    font-weight: var(--cf-font-weight-semibold);
    letter-spacing: var(--cf-letter-spacing-normal);
    line-height: 1;
    padding: 0 var(--cf-space-20);
    height: 42px;
    border-radius: var(--cf-radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-align: center;
    white-space: nowrap;
    user-select: none;
    transition: var(--cf-transition-color), transform var(--cf-duration-micro) var(--cf-ease-out), box-shadow var(--cf-duration-micro) var(--cf-ease-out);
    text-decoration: none;
    position: relative;
}

.cf-btn:active {
    transform: scale(0.98);
}

.cf-btn:disabled,
.cf-btn.is-disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

/* Primary Button */
.cf-btn--primary {
    background-color: var(--cf-color-primary);
    color: var(--cf-color-white);
    border-color: var(--cf-color-primary);
    box-shadow: 0 1px 2px rgba(47, 107, 255, 0.25);
}

.cf-btn--primary:hover {
    background-color: var(--cf-color-primary-hover);
    border-color: var(--cf-color-primary-hover);
    color: var(--cf-color-white);
    box-shadow: 0 4px 14px rgba(47, 107, 255, 0.35);
}

/* Secondary Button */
.cf-btn--secondary {
    background-color: var(--cf-color-surface-raised);
    color: var(--cf-color-text-primary);
    border-color: var(--cf-color-border-strong);
}

.cf-btn--secondary:hover {
    background-color: var(--cf-color-surface-elevated);
    border-color: var(--cf-color-text-muted);
    color: var(--cf-color-white);
}

/* Tertiary / Outlined Button */
.cf-btn--tertiary {
    background-color: transparent;
    color: var(--cf-color-text-primary);
    border-color: var(--cf-color-border);
}

.cf-btn--tertiary:hover {
    background-color: var(--cf-color-surface-raised);
    border-color: var(--cf-color-border-strong);
    color: var(--cf-color-white);
}

/* Danger Button */
.cf-btn--danger {
    background-color: var(--cf-color-danger);
    color: var(--cf-color-white);
    border-color: var(--cf-color-danger);
}

.cf-btn--danger:hover {
    background-color: #b53535;
    border-color: #b53535;
    color: var(--cf-color-white);
}

/* Ghost Button */
.cf-btn--ghost {
    background-color: transparent;
    color: var(--cf-color-text-secondary);
    border-color: transparent;
}

.cf-btn--ghost:hover {
    background-color: var(--cf-color-surface-raised);
    color: var(--cf-color-text-primary);
}

/* Icon Button */
.cf-btn--icon {
    padding: 0;
    width: 42px;
    height: 42px;
    border-radius: var(--cf-radius-sm);
}

.cf-btn--icon.cf-btn--sm {
    width: 32px;
    height: 32px;
}

.cf-btn--icon.cf-btn--lg {
    width: 50px;
    height: 50px;
}

/* Size Modifiers */
.cf-btn--sm {
    height: 32px;
    padding: 0 var(--cf-space-12);
    font-size: var(--cf-font-size-small);
}

.cf-btn--lg {
    height: 50px;
    padding: 0 var(--cf-space-24);
    font-size: var(--cf-font-size-body);
}

.cf-btn--full {
    width: 100%;
}

/* Loading State Spinner */
.cf-btn.is-loading {
    color: transparent !important;
    pointer-events: none;
}

.cf-btn.is-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    top: calc(50% - 8px);
    left: calc(50% - 8px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: cf-spin 0.6s linear infinite;
}

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

/* Button Group */
.cf-btn-group {
    display: inline-flex;
    background: var(--cf-color-surface-raised);
    border: 1px solid var(--cf-color-border);
    border-radius: var(--cf-radius-sm);
    padding: 3px;
    gap: 3px;
}

.cf-btn-group .cf-btn {
    height: 34px;
    padding: 0 var(--cf-space-16);
    border-radius: calc(var(--cf-radius-sm) - 3px);
    border: none;
    background: transparent;
    color: var(--cf-color-text-secondary);
}

.cf-btn-group .cf-btn.is-active,
.cf-btn-group .cf-btn:hover {
    background: var(--cf-color-surface-elevated);
    color: var(--cf-color-text-primary);
}


/* =============================================================================
 * 2. FORM SYSTEM
 * ========================================================================== */
.cf-form-group {
    margin-bottom: var(--cf-space-20);
    display: flex;
    flex-direction: column;
    gap: var(--cf-space-8);
}

.cf-form-label {
    font-size: var(--cf-font-size-small);
    font-weight: var(--cf-font-weight-medium);
    color: var(--cf-color-text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.cf-form-label .cf-required {
    color: var(--cf-color-danger);
    margin-left: var(--cf-space-4);
}

.cf-input,
.cf-select,
.cf-textarea {
    width: 100%;
    height: 44px;
    padding: 0 var(--cf-space-16);
    background-color: var(--cf-color-surface);
    border: 1px solid var(--cf-color-border);
    border-radius: var(--cf-radius-input);
    color: var(--cf-color-text-primary);
    font-family: var(--cf-font-body);
    font-size: var(--cf-font-size-body-sm);
    transition: var(--cf-transition-color), box-shadow var(--cf-duration-micro) var(--cf-ease-out);
}

.cf-textarea {
    height: auto;
    min-height: 100px;
    padding: var(--cf-space-12) var(--cf-space-16);
    line-height: var(--cf-line-height-normal);
    resize: vertical;
}

.cf-input:focus,
.cf-select:focus,
.cf-textarea:focus {
    border-color: var(--cf-color-primary);
    box-shadow: 0 0 0 1px var(--cf-color-primary), 0 0 0 4px var(--cf-color-primary-soft);
    background-color: var(--cf-color-surface-raised);
}

.cf-input::placeholder,
.cf-textarea::placeholder {
    color: var(--cf-color-text-muted);
}

.cf-input:disabled,
.cf-select:disabled,
.cf-textarea:disabled {
    background-color: var(--cf-color-ink);
    border-color: var(--cf-color-border);
    color: var(--cf-color-text-muted);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Error State */
.cf-input.is-error,
.cf-select.is-error,
.cf-textarea.is-error {
    border-color: var(--cf-color-danger);
    box-shadow: 0 0 0 1px var(--cf-color-danger), 0 0 0 4px var(--cf-color-danger-soft);
}

/* Success State */
.cf-input.is-success,
.cf-select.is-success,
.cf-textarea.is-success {
    border-color: var(--cf-color-success);
    box-shadow: 0 0 0 1px var(--cf-color-success), 0 0 0 4px var(--cf-color-success-soft);
}

.cf-form-hint {
    font-size: var(--cf-font-size-caption);
    color: var(--cf-color-text-muted);
}

.cf-form-error {
    font-size: var(--cf-font-size-caption);
    color: var(--cf-color-danger);
    display: flex;
    align-items: center;
    gap: var(--cf-space-4);
    font-weight: var(--cf-font-weight-medium);
}

/* Checkbox & Radio Controls */
.cf-control-label {
    display: inline-flex;
    align-items: center;
    gap: var(--cf-space-12);
    font-size: var(--cf-font-size-body-sm);
    color: var(--cf-color-text-primary);
    cursor: pointer;
    user-select: none;
}

.cf-checkbox,
.cf-radio {
    appearance: none;
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--cf-color-surface);
    border: 1px solid var(--cf-color-border-strong);
    border-radius: 4px;
    cursor: pointer;
    display: grid;
    place-content: center;
    transition: var(--cf-transition-color);
}

.cf-radio {
    border-radius: 50%;
}

.cf-checkbox:checked,
.cf-radio:checked {
    background: var(--cf-color-primary);
    border-color: var(--cf-color-primary);
}

.cf-checkbox:checked::before {
    content: '';
    width: 8px;
    height: 5px;
    border-left: 2px solid #ffffff;
    border-bottom: 2px solid #ffffff;
    transform: rotate(-45deg) translate(1px, -1px);
}

.cf-radio:checked::before {
    content: '';
    width: 6px;
    height: 6px;
    background: #ffffff;
    border-radius: 50%;
}

/* Toggle Switch */
.cf-toggle {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.cf-toggle input {
    opacity: 0;
    width: 0;
    height: 0;
}

.cf-toggle__slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--cf-color-surface-elevated);
    border: 1px solid var(--cf-color-border);
    transition: var(--cf-duration-fast) var(--cf-ease-out);
    border-radius: var(--cf-radius-full);
}

.cf-toggle__slider::before {
    position: absolute;
    content: '';
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--cf-color-text-secondary);
    transition: var(--cf-duration-fast) var(--cf-ease-out);
    border-radius: 50%;
}

.cf-toggle input:checked + .cf-toggle__slider {
    background-color: var(--cf-color-primary);
    border-color: var(--cf-color-primary);
}

.cf-toggle input:checked + .cf-toggle__slider::before {
    transform: translateX(20px);
    background-color: #ffffff;
}


/* =============================================================================
 * 3. BADGES & STATUS PILLS
 * ========================================================================== */
.cf-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--cf-space-4);
    font-family: var(--cf-font-sans);
    font-size: var(--cf-font-size-caption);
    font-weight: var(--cf-font-weight-semibold);
    letter-spacing: var(--cf-letter-spacing-wide);
    text-transform: uppercase;
    line-height: 1;
    padding: var(--cf-space-4) var(--cf-space-8);
    border-radius: var(--cf-radius-sm);
    border: 1px solid transparent;
    white-space: nowrap;
}

.cf-badge--pill {
    border-radius: var(--cf-radius-full);
    padding: var(--cf-space-4) var(--cf-space-12);
}

/* Badge Variants */
.cf-badge--primary {
    background: var(--cf-color-primary-soft);
    color: var(--cf-color-primary);
    border-color: rgba(47, 107, 255, 0.25);
}

.cf-badge--success {
    background: var(--cf-color-success-soft);
    color: var(--cf-color-success);
    border-color: rgba(34, 160, 107, 0.25);
}

.cf-badge--warning {
    background: var(--cf-color-warning-soft);
    color: var(--cf-color-warning);
    border-color: rgba(217, 144, 0, 0.25);
}

.cf-badge--danger {
    background: var(--cf-color-danger-soft);
    color: var(--cf-color-danger);
    border-color: rgba(214, 69, 69, 0.25);
}

.cf-badge--info {
    background: var(--cf-color-info-soft);
    color: var(--cf-color-info);
    border-color: rgba(76, 141, 255, 0.25);
}

.cf-badge--neutral {
    background: var(--cf-color-surface-raised);
    color: var(--cf-color-text-secondary);
    border-color: var(--cf-color-border);
}


/* =============================================================================
 * 4. CARD SYSTEM
 * ========================================================================== */
.cf-card {
    background-color: var(--cf-color-surface);
    border: 1px solid var(--cf-color-border);
    border-radius: var(--cf-radius-card);
    padding: var(--cf-space-24);
    position: relative;
    transition: var(--cf-transition-card);
}

.cf-card--interactive {
    cursor: pointer;
}

.cf-card--interactive:hover {
    border-color: var(--cf-color-border-strong);
    background-color: var(--cf-color-surface-raised);
    transform: translateY(-2px);
    box-shadow: var(--cf-shadow-card-hover);
}

.cf-card--raised {
    background-color: var(--cf-color-surface-raised);
}

.cf-card--elevated {
    background-color: var(--cf-color-surface-elevated);
    border-color: var(--cf-color-border-strong);
}

/* Stat Card */
.cf-stat-card {
    background: var(--cf-color-surface);
    border: 1px solid var(--cf-color-border);
    border-radius: var(--cf-radius-card);
    padding: var(--cf-space-20);
    display: flex;
    flex-direction: column;
    gap: var(--cf-space-12);
}

.cf-stat-card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cf-stat-card__eyebrow {
    font-size: var(--cf-font-size-small);
    color: var(--cf-color-text-muted);
    font-weight: var(--cf-font-weight-medium);
}

.cf-stat-card__value {
    font-family: var(--cf-font-sans);
    font-size: var(--cf-font-size-h2);
    font-weight: var(--cf-font-weight-bold);
    color: var(--cf-color-text-primary);
    letter-spacing: var(--cf-letter-spacing-tight);
}

.cf-stat-card__footer {
    display: flex;
    align-items: center;
    gap: var(--cf-space-8);
    font-size: var(--cf-font-size-caption);
    color: var(--cf-color-text-secondary);
}

/* Product Card */
.cf-product-card {
    background: var(--cf-color-surface);
    border: 1px solid var(--cf-color-border);
    border-radius: var(--cf-radius-card);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--cf-transition-card);
}

.cf-product-card:hover {
    border-color: var(--cf-color-border-strong);
    transform: translateY(-3px);
    box-shadow: var(--cf-shadow-card-hover);
}

.cf-product-card__media {
    position: relative;
    aspect-ratio: 4 / 3;
    background: var(--cf-color-surface-raised);
    display: grid;
    place-content: center;
    overflow: hidden;
}

.cf-product-card__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--cf-duration-base) var(--cf-ease-out);
}

.cf-product-card:hover .cf-product-card__media img {
    transform: scale(1.03);
}

.cf-product-card__badge {
    position: absolute;
    top: var(--cf-space-12);
    left: var(--cf-space-12);
    z-index: var(--cf-z-normal);
}

.cf-product-card__body {
    padding: var(--cf-space-20);
    display: flex;
    flex-direction: column;
    flex: 1 0 auto;
    gap: var(--cf-space-8);
}

.cf-product-card__category {
    font-size: var(--cf-font-size-micro);
    color: var(--cf-color-text-muted);
    letter-spacing: var(--cf-letter-spacing-caps);
    text-transform: uppercase;
}

.cf-product-card__title {
    font-size: var(--cf-font-size-body-lg);
    font-weight: var(--cf-font-weight-semibold);
    color: var(--cf-color-text-primary);
    line-height: var(--cf-line-height-snug);
}

.cf-product-card__footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: var(--cf-space-16);
    border-top: 1px solid var(--cf-color-border);
}


/* =============================================================================
 * 5. MODAL & DRAWER SYSTEM
 * ========================================================================== */
.cf-modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 13, 16, 0.82);
    backdrop-filter: blur(4px);
    z-index: var(--cf-z-modal);
    display: grid;
    place-items: center;
    padding: var(--cf-space-16);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--cf-duration-panel) var(--cf-ease-out), visibility var(--cf-duration-panel);
}

.cf-modal-backdrop.is-active {
    opacity: 1;
    visibility: visible;
}

.cf-modal {
    background: var(--cf-color-surface);
    border: 1px solid var(--cf-color-border-strong);
    border-radius: var(--cf-radius-lg);
    width: 100%;
    max-width: 560px;
    box-shadow: var(--cf-shadow-modal);
    transform: scale(0.95) translateY(10px);
    transition: transform var(--cf-duration-panel) var(--cf-ease-out);
    overflow: hidden;
}

.cf-modal-backdrop.is-active .cf-modal {
    transform: scale(1) translateY(0);
}

.cf-modal__header {
    padding: var(--cf-space-20) var(--cf-space-24);
    border-bottom: 1px solid var(--cf-color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cf-modal__title {
    font-size: var(--cf-font-size-h3);
    font-weight: var(--cf-font-weight-bold);
    color: var(--cf-color-text-primary);
}

.cf-modal__body {
    padding: var(--cf-space-24);
    color: var(--cf-color-text-secondary);
    line-height: var(--cf-line-height-relaxed);
}

.cf-modal__footer {
    padding: var(--cf-space-16) var(--cf-space-24);
    border-top: 1px solid var(--cf-color-border);
    background: var(--cf-color-surface-raised);
    display: flex;
    justify-content: flex-end;
    gap: var(--cf-space-12);
}


/* =============================================================================
 * 6. TABS, DROPDOWNS & TOOLTIPS
 * ========================================================================== */
.cf-tabs {
    display: flex;
    border-bottom: 1px solid var(--cf-color-border);
    gap: var(--cf-space-24);
}

.cf-tab-btn {
    background: none;
    border: none;
    padding: var(--cf-space-12) 0;
    font-family: var(--cf-font-sans);
    font-size: var(--cf-font-size-body-sm);
    font-weight: var(--cf-font-weight-medium);
    color: var(--cf-color-text-muted);
    cursor: pointer;
    position: relative;
    transition: var(--cf-transition-color);
}

.cf-tab-btn:hover {
    color: var(--cf-color-text-primary);
}

.cf-tab-btn.is-active {
    color: var(--cf-color-primary);
    font-weight: var(--cf-font-weight-semibold);
}

.cf-tab-btn.is-active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--cf-color-primary);
    border-radius: var(--cf-radius-full);
}

.cf-tab-panel {
    display: none;
    padding: var(--cf-space-20) 0;
}

.cf-tab-panel.is-active {
    display: block;
}

/* Dropdown Menu */
.cf-dropdown {
    position: relative;
    display: inline-block;
}

.cf-dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 200px;
    background: var(--cf-color-surface-raised);
    border: 1px solid var(--cf-color-border-strong);
    border-radius: var(--cf-radius-input);
    box-shadow: var(--cf-shadow-lg);
    padding: var(--cf-space-6);
    z-index: var(--cf-z-elevate);
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: var(--cf-transition-panel);
}

.cf-dropdown.is-open .cf-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.cf-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--cf-space-10);
    padding: var(--cf-space-8) var(--cf-space-12);
    font-size: var(--cf-font-size-small);
    color: var(--cf-color-text-secondary);
    border-radius: var(--cf-radius-sm);
    text-decoration: none;
    transition: var(--cf-transition-color);
}

.cf-dropdown-item:hover {
    background: var(--cf-color-surface-elevated);
    color: var(--cf-color-text-primary);
}


/* =============================================================================
 * 7. ALERTS, TOASTS & FEEDBACK
 * ========================================================================== */
.cf-alert {
    display: flex;
    gap: var(--cf-space-12);
    padding: var(--cf-space-16);
    border-radius: var(--cf-radius-input);
    border: 1px solid transparent;
    font-size: var(--cf-font-size-body-sm);
    line-height: var(--cf-line-height-normal);
}

.cf-alert--info {
    background: var(--cf-color-info-soft);
    border-color: rgba(76, 141, 255, 0.3);
    color: #93c5fd;
}

.cf-alert--success {
    background: var(--cf-color-success-soft);
    border-color: rgba(34, 160, 107, 0.3);
    color: #86efac;
}

.cf-alert--warning {
    background: var(--cf-color-warning-soft);
    border-color: rgba(217, 144, 0, 0.3);
    color: #fde047;
}

.cf-alert--danger {
    background: var(--cf-color-danger-soft);
    border-color: rgba(214, 69, 69, 0.3);
    color: #fca5a5;
}

/* Toast Notification */
.cf-toast {
    position: fixed;
    bottom: var(--cf-space-24);
    right: var(--cf-space-24);
    background: var(--cf-color-surface-elevated);
    border: 1px solid var(--cf-color-border-strong);
    border-radius: var(--cf-radius-input);
    padding: var(--cf-space-16) var(--cf-space-20);
    box-shadow: var(--cf-shadow-modal);
    z-index: var(--cf-z-toast);
    display: flex;
    align-items: center;
    gap: var(--cf-space-12);
    color: var(--cf-color-text-primary);
    font-size: var(--cf-font-size-body-sm);
}


/* =============================================================================
 * 8. TABLES & DATA LISTS
 * ========================================================================== */
.cf-table-container {
    width: 100%;
    overflow-x: auto;
    border: 1px solid var(--cf-color-border);
    border-radius: var(--cf-radius-card);
    background: var(--cf-color-surface);
}

.cf-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--cf-font-size-body-sm);
    text-align: left;
}

.cf-table th {
    background: var(--cf-color-surface-raised);
    padding: var(--cf-space-12) var(--cf-space-16);
    font-weight: var(--cf-font-weight-semibold);
    color: var(--cf-color-text-muted);
    font-size: var(--cf-font-size-caption);
    letter-spacing: var(--cf-letter-spacing-wide);
    text-transform: uppercase;
    border-bottom: 1px solid var(--cf-color-border);
}

.cf-table td {
    padding: var(--cf-space-16);
    border-bottom: 1px solid var(--cf-color-border);
    color: var(--cf-color-text-primary);
}

.cf-table tr:last-child td {
    border-bottom: none;
}

.cf-table tr:hover td {
    background: var(--cf-color-surface-raised);
}


/* =============================================================================
 * 9. STATES: EMPTY, LOADING, ERROR & SKELETON
 * ========================================================================== */
.cf-empty-state {
    text-align: center;
    padding: var(--cf-space-64) var(--cf-space-24);
    background: var(--cf-color-surface);
    border: 1px dashed var(--cf-color-border-strong);
    border-radius: var(--cf-radius-card);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--cf-space-16);
}

.cf-empty-state__icon {
    width: 48px;
    height: 48px;
    color: var(--cf-color-text-muted);
}

.cf-empty-state__title {
    font-size: var(--cf-font-size-h3);
    font-weight: var(--cf-font-weight-semibold);
    color: var(--cf-color-text-primary);
}

.cf-empty-state__desc {
    max-width: 420px;
    font-size: var(--cf-font-size-body-sm);
    color: var(--cf-color-text-secondary);
}

/* Skeleton Shimmer */
.cf-skeleton {
    background: linear-gradient(90deg, var(--cf-color-surface-raised) 25%, var(--cf-color-surface-elevated) 50%, var(--cf-color-surface-raised) 75%);
    background-size: 200% 100%;
    animation: cf-shimmer 1.5s infinite;
    border-radius: var(--cf-radius-sm);
    display: inline-block;
}

@keyframes cf-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.cf-divider {
    height: 1px;
    background: var(--cf-color-border);
    margin: var(--cf-space-24) 0;
    border: none;
}