/**
 * Arcform Shared Component Library
 *
 * Dark-theme UI components using canonical --arc-* design tokens
 * from the arcform-astra-child theme. All feature areas (Archive,
 * Studio, BE Hive) import this file.
 *
 * Requires: arcform.css (child theme) loaded first for token definitions.
 *
 * @package Arcform
 * @since 2.0.0
 */

/* ==========================================================================
   Base Reset for Plugin Containers
   ========================================================================== */

.arc-container,
.arc-container * {
    box-sizing: border-box;
}

.arc-container {
    font-family: var(--arc-font);
    line-height: 1.5;
    color: var(--arc-text);
    max-width: 1080px;
    margin: 0 auto;
    padding: 24px;
}

/* ==========================================================================
   Layout Grid
   ========================================================================== */

.arc-grid {
    display: grid;
    gap: 20px;
}

.arc-grid--2 { grid-template-columns: repeat(2, 1fr); }
.arc-grid--3 { grid-template-columns: repeat(3, 1fr); }
.arc-grid--4 { grid-template-columns: repeat(4, 1fr); }

.arc-grid--auto {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

@media (max-width: 768px) {
    .arc-grid--3,
    .arc-grid--4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .arc-grid--2,
    .arc-grid--3,
    .arc-grid--4 {
        grid-template-columns: 1fr;
    }
}

.arc-flex {
    display: flex;
    align-items: center;
    gap: 12px;
}

.arc-flex--between {
    justify-content: space-between;
}

.arc-flex--wrap {
    flex-wrap: wrap;
}

.arc-flex--col {
    flex-direction: column;
    align-items: stretch;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.arc-card {
    background-color: var(--arc-bg-surface);
    border: 1px solid var(--arc-border);
    border-radius: var(--arc-radius-lg);
    padding: 24px;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.arc-card--hover:hover {
    border-color: var(--arc-gold-muted);
    transform: translateY(-2px);
}

.arc-card--elevated {
    background-color: var(--arc-bg-elevated);
}

.arc-card--gold {
    border-color: var(--arc-gold-muted);
    background: linear-gradient(135deg, var(--arc-bg-surface) 0%, rgba(204, 168, 107, 0.05) 100%);
}

.arc-card--compact {
    padding: 16px;
}

.arc-card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--arc-border);
}

.arc-card__title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--arc-text);
    margin: 0;
}

.arc-card__subtitle {
    font-size: 0.875rem;
    color: var(--arc-text-sec);
    margin: 4px 0 0;
}

.arc-card__body {
    color: var(--arc-text-sec);
    line-height: 1.6;
}

.arc-card__footer {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--arc-border);
    display: flex;
    gap: 10px;
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.arc-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0.75em 1.75em;
    font-family: var(--arc-font);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    text-decoration: none;
    border: none;
    border-radius: var(--arc-radius);
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.15s ease, border-color 0.2s ease;
    line-height: 1.4;
}

.arc-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Primary — gold bg, dark text */
.arc-btn--primary {
    background-color: var(--arc-gold);
    color: var(--arc-bg-deep);
}

.arc-btn--primary:hover:not(:disabled) {
    background-color: var(--arc-gold-light);
    transform: translateY(-1px);
}

/* Secondary — surface bg, gold border */
.arc-btn--secondary {
    background-color: transparent;
    color: var(--arc-gold);
    border: 1px solid var(--arc-gold-muted);
}

.arc-btn--secondary:hover:not(:disabled) {
    background-color: rgba(204, 168, 107, 0.1);
    border-color: var(--arc-gold);
}

/* Ghost — no border, subtle hover */
.arc-btn--ghost {
    background-color: transparent;
    color: var(--arc-text-sec);
}

.arc-btn--ghost:hover:not(:disabled) {
    background-color: var(--arc-bg-elevated);
    color: var(--arc-text);
}

/* Danger */
.arc-btn--danger {
    background-color: var(--arc-error);
    color: #fff;
}

.arc-btn--danger:hover:not(:disabled) {
    background-color: #c4644d;
    transform: translateY(-1px);
}

/* Teal / success */
.arc-btn--teal {
    background-color: var(--arc-teal);
    color: var(--arc-bg-deep);
}

.arc-btn--teal:hover:not(:disabled) {
    background-color: #7dd9bc;
    transform: translateY(-1px);
}

/* Size variants */
.arc-btn--sm {
    padding: 0.5em 1.25em;
    font-size: 0.75rem;
}

.arc-btn--lg {
    padding: 1em 2.25em;
    font-size: 0.9rem;
}

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

.arc-btn--icon {
    padding: 0.6em;
    min-width: 36px;
}

/* Button group */
.arc-btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

@media (max-width: 480px) {
    .arc-btn-group--stack {
        flex-direction: column;
    }

    .arc-btn-group--stack .arc-btn {
        width: 100%;
    }
}

/* ==========================================================================
   Tab Bar
   ========================================================================== */

.arc-tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--arc-border);
    margin-bottom: 24px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.arc-tab {
    padding: 12px 20px;
    font-family: var(--arc-font);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--arc-text-sec);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    white-space: nowrap;
    transition: color 0.2s ease, border-color 0.2s ease;
}

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

.arc-tab.active,
.arc-tab--active {
    color: var(--arc-gold);
    border-bottom-color: var(--arc-gold);
}

.arc-tab-content {
    display: none;
}

.arc-tab-content.active,
.arc-tab-content--active {
    display: block;
}

/* Pill variant */
.arc-tabs--pills {
    border-bottom: none;
    gap: 8px;
    margin-bottom: 20px;
}

.arc-tabs--pills .arc-tab {
    border-bottom: none;
    border-radius: 20px;
    padding: 8px 16px;
    font-size: 0.8rem;
}

.arc-tabs--pills .arc-tab.active {
    background-color: var(--arc-gold);
    color: var(--arc-bg-deep);
}

/* ==========================================================================
   Stat Grid
   ========================================================================== */

.arc-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

@media (max-width: 768px) {
    .arc-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .arc-stats--stack {
        grid-template-columns: 1fr;
    }
}

.arc-stat {
    background-color: var(--arc-bg-surface);
    border: 1px solid var(--arc-border);
    border-radius: var(--arc-radius-lg);
    padding: 20px 16px;
    text-align: center;
}

.arc-stat--gold {
    background: linear-gradient(135deg, rgba(204, 168, 107, 0.1) 0%, rgba(204, 168, 107, 0.05) 100%);
    border-color: var(--arc-gold-muted);
}

.arc-stat__value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--arc-text);
    line-height: 1.2;
}

.arc-stat__label {
    display: block;
    font-size: 0.7rem;
    color: var(--arc-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 6px;
}

.arc-stat__icon {
    font-size: 1.25rem;
    margin-bottom: 8px;
    display: block;
}

/* ==========================================================================
   Forms
   ========================================================================== */

.arc-form-group {
    margin-bottom: 20px;
}

.arc-label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--arc-text);
    margin-bottom: 8px;
}

.arc-label--required::after {
    content: ' *';
    color: var(--arc-error);
}

.arc-input,
.arc-textarea,
.arc-select {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--arc-font);
    font-size: 0.9375rem;
    color: var(--arc-text);
    background-color: var(--arc-bg-surface);
    border: 1px solid var(--arc-border);
    border-radius: var(--arc-radius);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.arc-input:focus,
.arc-textarea:focus,
.arc-select:focus {
    outline: none;
    border-color: var(--arc-gold);
    box-shadow: 0 0 0 2px rgba(204, 168, 107, 0.15);
}

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

.arc-textarea {
    min-height: 100px;
    resize: vertical;
}

.arc-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23A0A0A8' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
}

.arc-hint {
    font-size: 0.8125rem;
    color: var(--arc-text-muted);
    margin-top: 6px;
}

.arc-input--error {
    border-color: var(--arc-error);
}

.arc-error-text {
    font-size: 0.8125rem;
    color: var(--arc-error);
    margin-top: 4px;
}

/* Checkbox / Radio */
.arc-check {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    margin-bottom: 10px;
}

.arc-check input[type="checkbox"],
.arc-check input[type="radio"] {
    accent-color: var(--arc-gold);
    width: 18px;
    height: 18px;
    margin-top: 2px;
    flex-shrink: 0;
}

.arc-check__label {
    font-size: 0.9375rem;
    color: var(--arc-text-sec);
}

/* Form actions row */
.arc-form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 24px;
}

/* ==========================================================================
   Modals
   ========================================================================== */

.arc-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.arc-modal__backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
}

.arc-modal__dialog {
    position: relative;
    background-color: var(--arc-bg-surface);
    border: 1px solid var(--arc-border);
    border-radius: var(--arc-radius-lg);
    max-width: 520px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.arc-modal__dialog--lg {
    max-width: 720px;
}

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

.arc-modal__title {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--arc-text);
}

.arc-modal__close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--arc-text-muted);
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color 0.2s ease;
}

.arc-modal__close:hover {
    color: var(--arc-text);
}

.arc-modal__body {
    padding: 24px;
}

.arc-modal__footer {
    padding: 16px 24px;
    border-top: 1px solid var(--arc-border);
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

/* ==========================================================================
   Lightbox
   ========================================================================== */

.arc-lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
}

.arc-lightbox__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
}

.arc-lightbox__content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.arc-lightbox__content img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: var(--arc-radius);
}

.arc-lightbox__close {
    position: absolute;
    top: -44px;
    right: 0;
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
}

body.arc-lightbox-open {
    overflow: hidden;
}

/* ==========================================================================
   Alerts / Notifications
   ========================================================================== */

.arc-alert {
    padding: 14px 20px;
    border-radius: var(--arc-radius);
    margin-bottom: 20px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 0.9375rem;
}

.arc-alert__icon {
    font-size: 1.125rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.arc-alert--success {
    background: rgba(95, 206, 171, 0.1);
    border: 1px solid rgba(95, 206, 171, 0.3);
    color: var(--arc-teal);
}

.arc-alert--warning {
    background: rgba(204, 168, 107, 0.1);
    border: 1px solid rgba(204, 168, 107, 0.3);
    color: var(--arc-gold-light);
}

.arc-alert--error {
    background: rgba(224, 122, 95, 0.1);
    border: 1px solid rgba(224, 122, 95, 0.3);
    color: var(--arc-error);
}

.arc-alert--info {
    background: rgba(123, 163, 201, 0.1);
    border: 1px solid rgba(123, 163, 201, 0.3);
    color: var(--arc-info);
}

/* Toast notifications — positioned fixed */
.arc-toast {
    position: fixed;
    top: 20px;
    right: 20px;
    background-color: var(--arc-bg-elevated);
    border: 1px solid var(--arc-border);
    padding: 14px 20px;
    border-radius: var(--arc-radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    gap: 12px;
    z-index: 99998;
    animation: arcSlideIn 0.3s ease;
    max-width: 400px;
}

@keyframes arcSlideIn {
    from {
        transform: translateX(100px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes arcSlideOut {
    from {
        transform: translateX(0);
        opacity: 1;
    }
    to {
        transform: translateX(100px);
        opacity: 0;
    }
}

.arc-toast--success {
    border-left: 3px solid var(--arc-teal);
}

.arc-toast--error {
    border-left: 3px solid var(--arc-error);
}

.arc-toast--warning {
    border-left: 3px solid var(--arc-gold);
}

.arc-toast--loading {
    border-left: 3px solid var(--arc-gold);
}

.arc-toast__icon {
    font-size: 1.125rem;
    flex-shrink: 0;
}

.arc-toast__message {
    color: var(--arc-text);
    font-size: 0.9375rem;
}

/* ==========================================================================
   Loading States
   ========================================================================== */

.arc-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    color: var(--arc-text-muted);
    gap: 12px;
}

.arc-spinner {
    width: 24px;
    height: 24px;
    border: 3px solid var(--arc-border);
    border-top-color: var(--arc-gold);
    border-radius: 50%;
    animation: arcSpin 0.8s linear infinite;
}

.arc-spinner--sm {
    width: 16px;
    height: 16px;
    border-width: 2px;
}

.arc-spinner--lg {
    width: 36px;
    height: 36px;
    border-width: 4px;
}

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

/* Skeleton loading */
.arc-skeleton {
    background: linear-gradient(90deg, var(--arc-bg-surface) 25%, var(--arc-bg-elevated) 50%, var(--arc-bg-surface) 75%);
    background-size: 200% 100%;
    animation: arcShimmer 1.5s ease infinite;
    border-radius: var(--arc-radius);
}

.arc-skeleton--text {
    height: 16px;
    margin-bottom: 8px;
}

.arc-skeleton--title {
    height: 24px;
    width: 60%;
    margin-bottom: 12px;
}

.arc-skeleton--avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
}

.arc-skeleton--card {
    height: 160px;
}

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

/* ==========================================================================
   Progress Bars
   ========================================================================== */

.arc-progress {
    height: 10px;
    background-color: var(--arc-bg-elevated);
    border-radius: 5px;
    overflow: hidden;
}

.arc-progress--sm {
    height: 6px;
}

.arc-progress--lg {
    height: 14px;
}

.arc-progress__fill {
    height: 100%;
    border-radius: 5px;
    transition: width 0.5s ease;
    background: linear-gradient(90deg, var(--arc-gold) 0%, var(--arc-gold-light) 100%);
}

.arc-progress__fill--teal {
    background: linear-gradient(90deg, var(--arc-teal) 0%, #7dd9bc 100%);
}

.arc-progress__fill--error {
    background: linear-gradient(90deg, var(--arc-error) 0%, #e8957e 100%);
}

/* Circular progress */
.arc-progress-circle {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.arc-progress-circle svg {
    transform: rotate(-90deg);
}

.arc-progress-circle__bg {
    fill: none;
    stroke: var(--arc-bg-elevated);
}

.arc-progress-circle__fill {
    fill: none;
    stroke: var(--arc-gold);
    stroke-linecap: round;
    transition: stroke-dashoffset 0.5s ease;
}

.arc-progress-circle__text {
    position: absolute;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--arc-text);
}

/* ==========================================================================
   Badges / Tags
   ========================================================================== */

.arc-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.arc-badge--gold {
    background: rgba(204, 168, 107, 0.15);
    color: var(--arc-gold-light);
}

.arc-badge--teal {
    background: rgba(95, 206, 171, 0.15);
    color: var(--arc-teal);
}

.arc-badge--error {
    background: rgba(224, 122, 95, 0.15);
    color: var(--arc-error);
}

.arc-badge--info {
    background: rgba(123, 163, 201, 0.15);
    color: var(--arc-info);
}

.arc-badge--muted {
    background: var(--arc-bg-elevated);
    color: var(--arc-text-muted);
}

.arc-badge--verified {
    background: rgba(95, 206, 171, 0.15);
    color: var(--arc-teal);
}

/* ==========================================================================
   Empty States
   ========================================================================== */

.arc-empty {
    text-align: center;
    padding: 60px 20px;
    color: var(--arc-text-muted);
}

.arc-empty__icon {
    font-size: 3rem;
    margin-bottom: 16px;
    display: block;
    opacity: 0.5;
}

.arc-empty__title {
    margin: 0 0 8px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--arc-text-sec);
}

.arc-empty__text {
    margin: 0 0 20px;
    color: var(--arc-text-muted);
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ==========================================================================
   Section Headers
   ========================================================================== */

.arc-section {
    margin-bottom: 40px;
}

.arc-section__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.arc-section__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--arc-text);
    margin: 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--arc-border);
    flex: 1;
}

.arc-section__title--gold {
    border-bottom-color: var(--arc-gold-muted);
}

.arc-section__count {
    background: var(--arc-bg-elevated);
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--arc-text-sec);
    margin-left: 12px;
}

/* ==========================================================================
   Timeline
   ========================================================================== */

.arc-timeline {
    position: relative;
    padding-left: 32px;
}

.arc-timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 6px;
    bottom: 6px;
    width: 2px;
    background: var(--arc-border);
}

.arc-timeline__item {
    position: relative;
    padding-bottom: 24px;
}

.arc-timeline__item:last-child {
    padding-bottom: 0;
}

.arc-timeline__marker {
    position: absolute;
    left: -32px;
    top: 0;
    width: 18px;
    height: 18px;
    background: var(--arc-bg-surface);
    border: 2px solid var(--arc-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 9px;
}

.arc-timeline__item--milestone .arc-timeline__marker {
    background: var(--arc-gold);
    border-color: var(--arc-gold);
    color: var(--arc-bg-deep);
}

.arc-timeline__item--verified .arc-timeline__marker {
    background: var(--arc-teal);
    border-color: var(--arc-teal);
    color: #fff;
}

.arc-timeline__item--modification .arc-timeline__marker {
    background: var(--arc-gold-muted);
    border-color: var(--arc-gold-muted);
    color: #fff;
}

.arc-timeline__date {
    font-size: 0.75rem;
    color: var(--arc-text-muted);
    margin-bottom: 4px;
}

.arc-timeline__title {
    margin: 0 0 4px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--arc-text);
}

.arc-timeline__text {
    margin: 0;
    font-size: 0.875rem;
    color: var(--arc-text-sec);
    line-height: 1.6;
}

/* ==========================================================================
   Table
   ========================================================================== */

.arc-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.arc-table th {
    text-align: left;
    padding: 12px 16px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--arc-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    border-bottom: 1px solid var(--arc-border);
}

.arc-table td {
    padding: 12px 16px;
    color: var(--arc-text-sec);
    border-bottom: 1px solid var(--arc-border);
}

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

.arc-table tr:hover td {
    background-color: rgba(255, 255, 255, 0.02);
}

/* ==========================================================================
   Pagination
   ========================================================================== */

.arc-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    margin-top: 32px;
}

.arc-pagination__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 8px;
    background: var(--arc-bg-surface);
    border: 1px solid var(--arc-border);
    border-radius: var(--arc-radius);
    color: var(--arc-text-sec);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: border-color 0.2s ease, color 0.2s ease;
}

.arc-pagination__btn:hover {
    border-color: var(--arc-gold-muted);
    color: var(--arc-text);
}

.arc-pagination__btn.active {
    background: var(--arc-gold);
    border-color: var(--arc-gold);
    color: var(--arc-bg-deep);
}

.arc-pagination__btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* ==========================================================================
   Breadcrumb
   ========================================================================== */

.arc-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8125rem;
    color: var(--arc-text-muted);
    margin-bottom: 16px;
}

.arc-breadcrumb a {
    color: var(--arc-text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

.arc-breadcrumb a:hover {
    color: var(--arc-gold);
}

.arc-breadcrumb__sep {
    color: var(--arc-text-muted);
    opacity: 0.5;
}

.arc-breadcrumb__current {
    color: var(--arc-text-sec);
}

/* ==========================================================================
   Avatar
   ========================================================================== */

.arc-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--arc-bg-elevated);
    border: 2px solid var(--arc-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--arc-gold);
    overflow: hidden;
    flex-shrink: 0;
}

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

.arc-avatar--sm {
    width: 32px;
    height: 32px;
    font-size: 0.75rem;
}

.arc-avatar--lg {
    width: 56px;
    height: 56px;
    font-size: 1.125rem;
}

/* ==========================================================================
   Divider
   ========================================================================== */

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

.arc-divider--gold {
    background: linear-gradient(90deg, transparent, var(--arc-gold-muted), transparent);
}

/* ==========================================================================
   NFC Web Prompt
   ========================================================================== */

.arc-nfc-prompt {
    text-align: center;
    padding: 40px 24px;
    background: var(--arc-bg-surface);
    border: 1px solid var(--arc-border);
    border-radius: var(--arc-radius-lg);
}

.arc-nfc-prompt__icon {
    font-size: 3rem;
    margin-bottom: 16px;
    display: block;
}

.arc-nfc-prompt__title {
    margin: 0 0 8px;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--arc-text);
}

.arc-nfc-prompt__text {
    margin: 0;
    color: var(--arc-text-sec);
    font-size: 0.9375rem;
}

/* ==========================================================================
   Responsive Utilities
   ========================================================================== */

.arc-hide-mobile {
    display: block;
}

.arc-show-mobile {
    display: none;
}

@media (max-width: 768px) {
    .arc-hide-mobile {
        display: none !important;
    }
    .arc-show-mobile {
        display: block !important;
    }
}

/* ==========================================================================
   Sub-Navigation
   ========================================================================== */

.arc-subnav {
    display: flex;
    gap: 0;
    background-color: var(--arc-bg-surface);
    border: 1px solid var(--arc-border);
    border-radius: var(--arc-radius-lg);
    padding: 4px;
    margin-bottom: 24px;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.arc-subnav::-webkit-scrollbar {
    display: none;
}

.arc-subnav__link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    font-family: var(--arc-font);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--arc-text-sec);
    text-decoration: none;
    white-space: nowrap;
    border-radius: var(--arc-radius);
    transition: color 0.2s ease, background-color 0.2s ease;
}

.arc-subnav__link:hover {
    color: var(--arc-text);
    background-color: var(--arc-bg-elevated);
}

.arc-subnav__link:focus-visible {
    outline: 2px solid var(--arc-gold);
    outline-offset: -2px;
}

.arc-subnav__link--active {
    color: var(--arc-bg-deep);
    background-color: var(--arc-gold);
    font-weight: 700;
}

.arc-subnav__link--active:hover {
    color: var(--arc-bg-deep);
    background-color: var(--arc-gold-light);
}

.arc-subnav__link--external {
    margin-left: auto;
}

.arc-subnav__external-icon {
    font-size: 0.75em;
    opacity: 0.6;
    transition: opacity 0.2s ease;
}

.arc-subnav__link--external:hover .arc-subnav__external-icon {
    opacity: 1;
}

.arc-subnav__badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    font-size: 0.6875rem;
    font-weight: 700;
    line-height: 1;
    border-radius: 9px;
    background-color: var(--arc-error);
    color: #fff;
}

.arc-subnav__link--active .arc-subnav__badge {
    background-color: var(--arc-bg-deep);
    color: var(--arc-gold);
}

@media (max-width: 768px) {
    .arc-subnav {
        margin-left: -24px;
        margin-right: -24px;
        border-radius: 0;
        border-left: none;
        border-right: none;
        padding: 4px 20px;
    }

    .arc-subnav__link {
        padding: 8px 12px;
        font-size: 0.75rem;
    }
}

/* ==========================================================================
   Skip Link (Accessibility)
   ========================================================================== */

.arc-skip-link {
    position: absolute;
    top: -100%;
    left: 16px;
    z-index: 100000;
    padding: 12px 24px;
    background-color: var(--arc-gold);
    color: var(--arc-bg-deep);
    font-weight: 700;
    font-size: 0.875rem;
    text-decoration: none;
    border-radius: var(--arc-radius);
    transition: top 0.2s ease;
}

.arc-skip-link:focus {
    top: 16px;
    outline: 2px solid var(--arc-text);
    outline-offset: 2px;
}

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

/* Focus visible styles (accessibility) */
.arc-container a:focus-visible,
.arc-container button:focus-visible,
.arc-container input:focus-visible,
.arc-container select:focus-visible,
.arc-container textarea:focus-visible {
    outline: 2px solid var(--arc-gold);
    outline-offset: 2px;
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    .arc-container,
    .arc-container * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ==========================================================================
   Lazy Load / Deferred Content
   ========================================================================== */

.arc-lazy {
    opacity: 0;
    transition: opacity 0.4s ease;
}

.arc-lazy--loaded {
    opacity: 1;
}

img[loading="lazy"] {
    background-color: var(--arc-bg-elevated);
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.arc-text-gold   { color: var(--arc-gold); }
.arc-text-teal   { color: var(--arc-teal); }
.arc-text-sec    { color: var(--arc-text-sec); }
.arc-text-muted  { color: var(--arc-text-muted); }
.arc-text-center { text-align: center; }
.arc-text-right  { text-align: right; }

.arc-mt-0  { margin-top: 0; }
.arc-mt-8  { margin-top: 8px; }
.arc-mt-16 { margin-top: 16px; }
.arc-mt-24 { margin-top: 24px; }
.arc-mb-0  { margin-bottom: 0; }
.arc-mb-8  { margin-bottom: 8px; }
.arc-mb-16 { margin-bottom: 16px; }
.arc-mb-24 { margin-bottom: 24px; }

.arc-hidden { display: none !important; }

.arc-truncate {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.arc-mono {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875em;
}

/* ==========================================================================
   Animations
   ========================================================================== */

.arc-fade-in {
    animation: arcFadeIn 0.4s ease-out forwards;
    opacity: 0;
}

@keyframes arcFadeIn {
    to { opacity: 1; }
}

.arc-slide-up {
    animation: arcSlideUp 0.4s ease-out forwards;
    opacity: 0;
    transform: translateY(12px);
}

@keyframes arcSlideUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ==========================================================================
   Print
   ========================================================================== */

/* ==========================================================================
   Responsive: Container & Dashboard
   ========================================================================== */

@media (max-width: 768px) {
    .arc-container {
        padding: 16px;
    }

    .arcform-dashboard .dashboard-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .arcform-dashboard .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
    }

    .arcform-dashboard .section-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .arcform-dashboard .instruments-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

@media (max-width: 480px) {
    .arc-container {
        padding: 12px;
    }

    .arcform-dashboard .dashboard-stats {
        grid-template-columns: 1fr 1fr;
        gap: 6px;
    }

    .arcform-dashboard .instruments-grid {
        grid-template-columns: 1fr;
    }

    /* Stack BE Hive 3-column stats on mobile */
    .arcform-dashboard .arc-grid--3 {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 1280px) {
    .arc-container {
        max-width: 1120px;
    }
}

/* ==========================================================================
   Print
   ========================================================================== */

@media print {
    .arc-btn,
    .arc-tabs,
    .arc-toast,
    .arc-modal,
    .arc-nfc-prompt,
    .arc-subnav,
    .arc-skip-link {
        display: none !important;
    }

    .arc-card {
        border: 1px solid #ccc;
        break-inside: avoid;
    }

    .arc-container {
        color: #000;
        max-width: 100%;
    }
}