/**
 * Components CSS - UI Component Library
 * Phase 3.1 - Premium Theme System
 */

/* =====================
 * BUTTONS
 * ===================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    line-height: 1.5;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 2px solid transparent;
    border-radius: var(--radius-base);
    transition: all var(--transition-base);
}

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

/* Button Sizes */
.btn-sm {
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: var(--font-size-sm);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-xl {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-xl);
}

/* Button Variants */
.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-primary-contrast);
    border-color: var(--color-primary);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--color-secondary);
    color: var(--color-secondary-contrast);
    border-color: var(--color-secondary);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-secondary-dark);
    border-color: var(--color-secondary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-outline:hover:not(:disabled) {
    background-color: var(--color-primary);
    color: var(--color-primary-contrast);
}

.btn-outline-light {
    background-color: transparent;
    color: var(--color-text-inverse);
    border-color: var(--color-text-inverse);
}

.btn-outline-light:hover:not(:disabled) {
    background-color: var(--color-text-inverse);
    color: var(--color-primary);
}

.btn-ghost {
    background-color: transparent;
    color: var(--color-text);
    border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--color-surface);
}

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

.btn-white:hover:not(:disabled) {
    background-color: var(--color-surface);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Icon Button */
.btn-icon {
    padding: var(--spacing-sm);
    aspect-ratio: 1;
}

/* Button with icon */
.btn svg,
.btn i {
    width: 1.25em;
    height: 1.25em;
}

/* =====================
 * CARDS
 * ===================== */

.card {
    background-color: var(--color-background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-base);
    overflow: hidden;
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.card-hover:hover {
    transform: translateY(-4px);
}

.card-img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
}

.card-img-square {
    aspect-ratio: 1;
}

.card-body {
    padding: var(--spacing-lg);
}

.card-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-text);
}

.card-subtitle {
    font-size: var(--font-size-sm);
    color: var(--color-primary);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-sm);
}

.card-text {
    color: var(--color-text-light);
    line-height: var(--line-height-relaxed);
}

.card-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

/* Card Variants */
.card-bordered {
    box-shadow: none;
    border: 1px solid var(--color-border);
}

.card-flat {
    box-shadow: none;
    background-color: var(--color-surface);
}

.card-gradient {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-text-inverse);
}

.card-gradient .card-title,
.card-gradient .card-text {
    color: inherit;
}

/* =====================
 * FORMS
 * ===================== */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-base);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input::placeholder {
    color: var(--color-text-muted);
}

.form-input:disabled {
    background-color: var(--color-surface);
    cursor: not-allowed;
}

/* Input Sizes */
.form-input-sm { padding: var(--spacing-xs) var(--spacing-sm); font-size: var(--font-size-sm); }
.form-input-lg { padding: var(--spacing-md) var(--spacing-lg); font-size: var(--font-size-lg); }

/* Textarea */
.form-textarea {
    min-height: 120px;
    resize: vertical;
}

/* Select */
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: left var(--spacing-sm) center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-left: var(--spacing-2xl);
}

/* Checkbox & Radio */
.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-check-input {
    width: 1.25rem;
    height: 1.25rem;
    accent-color: var(--color-primary);
    cursor: pointer;
}

.form-check-label {
    cursor: pointer;
}

/* Form Error State */
.form-error .form-input,
.form-error .form-select,
.form-error .form-textarea {
    border-color: var(--color-error);
}

.form-error-message {
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--spacing-xs);
}

/* =====================
 * BADGES
 * ===================== */

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    line-height: 1;
    border-radius: var(--radius-full);
}

.badge-primary {
    background-color: var(--color-primary);
    color: var(--color-primary-contrast);
}

.badge-secondary {
    background-color: var(--color-secondary);
    color: var(--color-secondary-contrast);
}

.badge-success {
    background-color: var(--color-success);
    color: white;
}

.badge-warning {
    background-color: var(--color-warning);
    color: white;
}

.badge-error {
    background-color: var(--color-error);
    color: white;
}

.badge-outline {
    background-color: transparent;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
}

/* =====================
 * AVATARS
 * ===================== */

.avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: var(--radius-full);
    background-color: var(--color-primary);
    color: var(--color-primary-contrast);
    font-weight: var(--font-weight-bold);
    overflow: hidden;
}

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

.avatar-sm { width: 2rem; height: 2rem; font-size: var(--font-size-sm); }
.avatar-lg { width: 4rem; height: 4rem; font-size: var(--font-size-xl); }
.avatar-xl { width: 6rem; height: 6rem; font-size: var(--font-size-3xl); }

.avatar-group {
    display: flex;
}

.avatar-group .avatar {
    margin-inline-start: -0.75rem;
    border: 2px solid var(--color-background);
}

.avatar-group .avatar:first-child {
    margin-inline-start: 0;
}

/* =====================
 * ALERTS
 * ===================== */

.alert {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-base);
    margin-bottom: var(--spacing-md);
}

.alert-icon {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
}

.alert-content {
    flex: 1;
}

.alert-title {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-info {
    background-color: #dbeafe;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

/* =====================
 * DIVIDERS
 * ===================== */

.divider {
    height: 1px;
    background-color: var(--color-border);
    margin: var(--spacing-lg) 0;
}

.divider-vertical {
    width: 1px;
    height: 100%;
    background-color: var(--color-border);
    margin: 0 var(--spacing-lg);
}

.divider-text {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.divider-text::before,
.divider-text::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--color-border);
}

/* =====================
 * LOADING SPINNER
 * ===================== */

.spinner {
    width: 2rem;
    height: 2rem;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.spinner-sm { width: 1rem; height: 1rem; border-width: 2px; }
.spinner-lg { width: 3rem; height: 3rem; border-width: 4px; }

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

/* =====================
 * SKELETON LOADER
 * ===================== */

.skeleton {
    background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-border) 50%, var(--color-surface) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--radius-base);
}

.skeleton-text {
    height: 1em;
    margin-bottom: var(--spacing-sm);
}

.skeleton-title {
    height: 1.5em;
    width: 60%;
    margin-bottom: var(--spacing-md);
}

.skeleton-avatar {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
}

.skeleton-img {
    aspect-ratio: 16/9;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* =====================
 * TOOLTIPS
 * ===================== */

[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-text);
    color: var(--color-text-inverse);
    font-size: var(--font-size-xs);
    white-space: nowrap;
    border-radius: var(--radius-sm);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
    z-index: var(--z-tooltip);
}

[data-tooltip]:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-8px);
}

/* =====================
 * PROGRESS BAR
 * ===================== */

.progress {
    height: 0.5rem;
    background-color: var(--color-surface);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background-color: var(--color-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

.progress-bar-striped {
    background-image: linear-gradient(
        45deg,
        rgba(255, 255, 255, 0.15) 25%,
        transparent 25%,
        transparent 50%,
        rgba(255, 255, 255, 0.15) 50%,
        rgba(255, 255, 255, 0.15) 75%,
        transparent 75%,
        transparent
    );
    background-size: 1rem 1rem;
}

.progress-bar-animated {
    animation: progress-bar-stripes 1s linear infinite;
}

@keyframes progress-bar-stripes {
    0% { background-position: 1rem 0; }
    100% { background-position: 0 0; }
}

/* =====================
 * TABS
 * ===================== */

.tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    gap: var(--spacing-md);
}

.tab {
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-light);
    font-weight: var(--font-weight-medium);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: all var(--transition-fast);
    cursor: pointer;
}

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

.tab.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.tab-content {
    padding: var(--spacing-lg) 0;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* =====================
 * ACCORDION
 * ===================== */

.accordion {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--color-border);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background-color: var(--color-background);
    font-weight: var(--font-weight-semibold);
    text-align: right;
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.accordion-header:hover {
    background-color: var(--color-surface);
}

.accordion-icon {
    width: 1.25rem;
    height: 1.25rem;
    transition: transform var(--transition-base);
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-body {
    padding: 0 var(--spacing-lg) var(--spacing-lg);
    color: var(--color-text-light);
}

/* =====================
 * MODAL
 * ===================== */

.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--color-background);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow: hidden;
    transform: scale(0.95) translateY(20px);
    transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

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

.modal-title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    margin: 0;
}

.modal-close {
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-base);
    color: var(--color-text-muted);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--color-surface);
    color: var(--color-text);
}

.modal-body {
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.modal-footer {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--spacing-sm);
    padding: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* Modal Sizes */
.modal-sm { max-width: 400px; }
.modal-lg { max-width: 700px; }
.modal-xl { max-width: 900px; }
.modal-full { max-width: calc(100% - 2rem); max-height: calc(100% - 2rem); }