/* =====================================================
   HOLD SEGMENTATION - MAIN STYLES
   ===================================================== */

/* CSS Variables */
:root {
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-primary-light: #93c5fd;
    --color-secondary: #6b7280;
    --color-secondary-hover: #4b5563;
    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-surface: #1e293b;
    --color-surface-hover: #334155;
    --color-border: #475569;
    
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;
    
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    
    --header-height: 60px;
    --sidebar-width: 280px;
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    overflow-x: hidden;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    color: var(--color-primary-hover);
}

img {
    max-width: 100%;
    height: auto;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

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

.btn:focus {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-primary);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

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

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

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

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

.btn-danger:hover {
    background-color: var(--color-danger-hover);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
}

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

.btn-icon {
    padding: var(--spacing-sm);
    min-width: 36px;
    min-height: 36px;
}

/* =====================================================
   HEADER
   ===================================================== */

.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-md);
    max-width: 1920px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text);
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.logo svg {
    color: var(--color-primary);
}

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

.header-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* =====================================================
   MAIN CONTENT
   ===================================================== */

.app-main {
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* =====================================================
   GALLERY
   ===================================================== */

.gallery-container {
    padding: var(--spacing-lg);
    max-width: 1920px;
    margin: 0 auto;
}

.gallery-header {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.gallery-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.gallery-subtitle {
    color: var(--color-text-secondary);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* Image Card */
.image-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    cursor: pointer;
}

.image-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.image-card-thumbnail {
    position: relative;
    aspect-ratio: 4/3;
    background-color: var(--color-bg-tertiary);
    overflow: hidden;
}

.image-card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.image-card:hover .image-card-thumbnail img {
    transform: scale(1.05);
}

.image-card-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(0, 0, 0, 0.75);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    backdrop-filter: blur(4px);
}

.image-card-info {
    padding: var(--spacing-md);
}

.image-card-name {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.image-card-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.image-card-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.image-card-actions .btn {
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.image-card:hover .image-card-actions .btn {
    opacity: 1;
}

/* Loading & Empty States */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl) * 2;
    text-align: center;
    color: var(--color-text-secondary);
}

.empty-state svg {
    opacity: 0.5;
}

.empty-state h2 {
    color: var(--color-text);
}

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

.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal-sm {
    max-width: 400px;
}

.modal-lg {
    max-width: 640px;
}

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

.modal-header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-xl);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--color-bg-tertiary);
    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-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* Drop Zone */
.drop-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-xl);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.drop-zone.drag-over {
    border-color: var(--color-primary);
    background-color: rgba(59, 130, 246, 0.1);
}

.drop-zone svg {
    opacity: 0.5;
}

.drop-zone span {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.upload-preview {
    text-align: center;
}

.upload-preview img {
    max-height: 300px;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.preview-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.preview-info input {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--font-size-sm);
}

.preview-info input:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* =====================================================
   TOAST NOTIFICATIONS
   ===================================================== */

#toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 300;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    animation: toast-in 0.3s ease;
}

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

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

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

@keyframes toast-in {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* =====================================================
   FILE LIST (MULTI-UPLOAD)
   ===================================================== */

.file-list-container {
    margin-top: var(--spacing-md);
}

.file-list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.file-list {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.file-list-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    font-size: var(--font-size-sm);
}

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

.file-list-item-thumb {
    width: 40px;
    height: 30px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    background-color: var(--color-bg-tertiary);
    flex-shrink: 0;
}

.file-list-item-info {
    flex: 1;
    min-width: 0;
}

.file-list-item-name {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    color: var(--color-text);
}

.file-list-item-size {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

.file-list-item-remove {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    border-radius: var(--radius-sm);
    flex-shrink: 0;
    transition: all var(--transition-fast);
}

.file-list-item-remove:hover {
    background-color: var(--color-danger);
    color: white;
}

/* =====================================================
   MODEL SELECTION
   ===================================================== */

.model-selection {
    margin-top: var(--spacing-lg);
}

.model-selection-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.model-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
}

.model-option {
    position: relative;
    display: block;
    cursor: pointer;
}

.model-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.model-option-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-fast);
}

.model-option:hover .model-option-content {
    border-color: var(--color-primary-light);
    background-color: rgba(59, 130, 246, 0.05);
}

.model-option.selected .model-option-content {
    border-color: var(--color-primary);
    background-color: rgba(59, 130, 246, 0.1);
}

.model-option-icon {
    color: var(--color-text-secondary);
}

.model-option.selected .model-option-icon {
    color: var(--color-primary);
}

.model-option-name {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--color-text);
}

.model-option-desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* =====================================================
   PROCESSING STATUS BADGE ON GALLERY CARDS
   ===================================================== */

.image-card-processing {
    position: absolute;
    bottom: var(--spacing-sm);
    left: var(--spacing-sm);
    right: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: rgba(0, 0, 0, 0.8);
    color: var(--color-warning);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    backdrop-filter: blur(4px);
}

.image-card-processing .spinner-sm {
    width: 14px;
    height: 14px;
    border: 2px solid rgba(245, 158, 11, 0.3);
    border-top-color: var(--color-warning);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    flex-shrink: 0;
}

.image-card-error {
    color: var(--color-danger);
}

.image-card-error .spinner-sm {
    display: none;
}

/* =====================================================
   UTILITIES
   ===================================================== */

.text-muted {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* =====================================================
/* =====================================================
   UPLOAD TYPE SELECTOR (Separate / Panorama tabs)
   ===================================================== */

.upload-type-selector {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-lg);
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    padding: 4px;
}

.upload-type-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.upload-type-tab:hover {
    color: var(--color-text);
    background-color: var(--color-bg-tertiary);
}

.upload-type-tab.active {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.upload-type-tab svg {
    flex-shrink: 0;
}

/* Upload type content sections */
.upload-type-content {
    display: none;
}

.upload-type-content.active {
    display: block;
}

/* =====================================================
   PANORAMA STITCH MODAL
   ===================================================== */

/* Wall name input section */
.stitch-wall-name {
    margin-bottom: var(--spacing-lg);
}

.stitch-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stitch-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: var(--font-size-base);
    font-family: inherit;
    transition: border-color var(--transition-fast);
}

.stitch-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

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

.stitch-hint {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* Reorderable file list */
.stitch-file-list .stitch-sortable-item {
    cursor: default;
    user-select: none;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.stitch-sortable-item.stitch-dragging {
    opacity: 0.4;
    background-color: var(--color-bg-tertiary);
}

.stitch-sortable-item.stitch-drag-over {
    border-top: 2px solid var(--color-primary);
    background-color: rgba(59, 130, 246, 0.08);
}

.stitch-drag-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    color: var(--color-text-muted);
    cursor: grab;
    flex-shrink: 0;
    opacity: 0.6;
    transition: opacity var(--transition-fast), color var(--transition-fast);
}

.stitch-drag-handle:hover {
    opacity: 1;
    color: var(--color-primary);
}

.stitch-drag-handle:active {
    cursor: grabbing;
}

.stitch-order-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background-color: var(--color-primary);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 700;
    border-radius: var(--radius-full);
    flex-shrink: 0;
}

/* =====================================================
   PLACEHOLDER GALLERY CARDS (for pending stitch jobs)
   ===================================================== */

.image-card-placeholder .image-card-thumbnail {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-tertiary);
}

.image-card-placeholder-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
}

/* =====================================================
   RESPONSIVE
   ===================================================== */

@media (max-width: 768px) {
    :root {
        --header-height: 56px;
    }
    
    .logo span {
        display: none;
    }
    
    .gallery-container {
        padding: var(--spacing-md);
    }
    
    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: var(--spacing-md);
    }
    
    .image-card-actions .btn {
        opacity: 1;
    }
    
    .modal-content {
        max-height: 100vh;
        border-radius: 0;
    }
}

@media (max-width: 480px) {
    .gallery-grid {
        grid-template-columns: 1fr;
    }
    
    .btn span {
        display: none;
    }
    
    .btn-lg span {
        display: inline;
    }
}