/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    background: linear-gradient(#0d1117 90%, #0000 90%);
    padding: 1.5rem 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

header.hidden {
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}

.header-content {
    width: 100%;
}

.header-branding {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.header-logo {
    height: 50px;
    width: auto;
}

header h1 {
    font-size: 1.5rem;
    margin: 0;
    color: white;
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* Header Toggle Button */
.header-toggle-container {
    position: fixed;
    top: 10px;
    right: 10px;
    z-index: 1000;
}

.header-toggle-btn {
    background: #0d1117;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: all 0.2s;
}

.header-toggle-btn:hover {
    background: #161b22;
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.05);
}

.controls {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* Buttons */
button {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 0.375rem;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: white;
    color: #0d1117;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    background: #f6f8fa;
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-weight: 400;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    color: white;
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

button:disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Main Container */
main {
    flex: 1;
    padding: 2rem;
    overflow-x: auto;
    overflow-y: auto;
}

.viewers-container {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(2, 1fr);
    grid-auto-rows: minmax(400px, auto);
    min-width: min-content;
}

/* Empty State */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.empty-state .hint {
    font-size: 0.875rem;
    opacity: 0.7;
}

/* Viewer Card */
.viewer-card {
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 300px;
    position: relative;
}

.viewer-header {
    padding: 1rem;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.viewer-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.viewer-close {
    background: var(--danger-color);
    color: white;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    border-radius: 0.25rem;
}

.viewer-close:hover {
    background: #dc2626;
}

.viewer-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    position: relative;
    overflow: hidden;
}

.viewer-content img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.viewer-loading {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.viewer-controls {
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.nav-buttons {
    display: flex;
    gap: 0.5rem;
}

.nav-buttons button {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

/* Override button styles for controls inside viewer cards */
.viewer-controls .btn-secondary,
.floating-window-controls .btn-secondary,
.floating-window-settings .btn-secondary,
.modal .btn-secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.viewer-controls .btn-secondary:hover,
.floating-window-controls .btn-secondary:hover,
.floating-window-settings .btn-secondary:hover,
.modal .btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--secondary-color);
}

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

.modal .btn-primary:hover {
    background: #1d4ed8;
}

.frame-info {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow: auto;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0;
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.25rem;
}

.close-btn:hover {
    background: var(--bg-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
}

.layout-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.layout-controls label {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 500;
}

.layout-controls input[type="range"] {
    flex: 1;
}

.layout-controls span {
    min-width: 2rem;
    text-align: center;
    font-weight: 600;
    color: var(--primary-color);
}

.layout-preview {
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    background: var(--bg-primary);
    min-height: 200px;
    display: grid;
    gap: 0.5rem;
}

.layout-preview-item {
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 0.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    min-height: 60px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .viewers-container {
        grid-template-columns: 1fr;
    }

    header {
        padding: 1rem;
    }

    .controls {
        flex-direction: column;
    }

    button {
        width: 100%;
        justify-content: center;
    }
}

/* Toast Notifications */
.error-toast,
.success-toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    border-radius: 0.5rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 2000;
    animation: slideIn 0.3s ease;
}

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

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

.fade-out {
    animation: fadeOut 0.3s ease forwards;
}

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

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

/* Image loading animation */
.viewer-content img {
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Viewer card hover effect */
.viewer-card {
    transition: transform 0.2s, box-shadow 0.2s;
}

.viewer-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Keyboard Help */
.keyboard-help {
    padding: 1.5rem;
}

.keyboard-help h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

.keyboard-help table {
    width: 100%;
    margin-bottom: 1.5rem;
    border-collapse: collapse;
}

.keyboard-help tr {
    border-bottom: 1px solid var(--border-color);
}

.keyboard-help td {
    padding: 0.75rem 0.5rem;
}

.keyboard-help td:first-child {
    font-weight: 500;
    white-space: nowrap;
}

.keyboard-help kbd {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    padding: 0.125rem 0.5rem;
    font-family: monospace;
    font-size: 0.875rem;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    display: inline-block;
}

.keyboard-help button {
    width: 100%;
}

/* Viewer Header Buttons */
.viewer-header-buttons {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.viewer-edit-title {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    border-radius: 0.25rem;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}

.viewer-edit-title:hover {
    background: #1d4ed8;
}

.viewer-toggle-controls {
    background: var(--secondary-color);
    color: white;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    border-radius: 0.25rem;
    border: none;
    cursor: pointer;
    transition: background 0.2s;
}

.viewer-toggle-controls:hover {
    background: #475569;
}

/* Crop Modal */
.crop-modal-content {
    max-width: 900px;
}

.crop-instructions {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    text-align: center;
}

.crop-container {
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
    margin-bottom: 1rem;
    min-height: 400px;
}

#cropCanvas {
    cursor: crosshair;
    max-width: 100%;
    border: 1px solid var(--border-color);
    background: #000;
}

.crop-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.crop-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* View Settings Modal */
.view-settings-section {
    margin-bottom: 2rem;
}

.view-settings-section h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.view-settings-section label {
    display: block;
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
}

.view-settings-section label input[type="radio"] {
    margin-right: 0.5rem;
}

.custom-size-controls {
    margin-top: 1rem;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.custom-size-controls label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.custom-size-controls label:last-child {
    margin-bottom: 0;
}

.custom-size-controls input[type="range"] {
    flex: 1;
}

.custom-size-controls span {
    min-width: 3rem;
    text-align: right;
    font-weight: 600;
}

.position-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    max-width: 200px;
    margin: 0 auto 1rem;
}

.position-btn {
    aspect-ratio: 1;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.position-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
    transform: scale(1.05);
}

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

.position-label {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.position-label strong {
    color: var(--primary-color);
    font-weight: 600;
}

/* Import Config Modal */
.import-step h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.folders-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    max-height: 400px;
    overflow-y: auto;
    padding: 1rem;
    background: var(--bg-primary);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.folder-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 0.375rem;
    transition: all 0.2s;
}

.folder-item:hover {
    border-color: var(--primary-color);
}

.folder-item.selected {
    background: #e0f2fe;
    border-color: var(--success-color);
}

.folder-item-info {
    flex: 1;
}

.folder-item-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.folder-item-path {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

.folder-item button {
    padding: 0.5rem 1rem;
}

.folder-item.selected button {
    background: var(--success-color);
    color: white;
}

.import-step {
    min-height: 200px;
}

/* Floating Window */
.floating-window {
    position: fixed;
    top: 150px;
    right: 50px;
    width: 500px;
    background: var(--bg-secondary);
    border: 2px solid var(--primary-color);
    border-radius: 0.75rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    z-index: 1500;
    display: flex;
    flex-direction: column;
    resize: both;
    overflow: hidden;
    min-width: 300px;
    min-height: 350px;
    max-width: 90vw;
    max-height: 90vh;
    transition: opacity 0.2s;
}

.floating-window.hidden {
    display: none;
}

.floating-window-header {
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: move;
    user-select: none;
}

.floating-window-title {
    font-weight: 600;
    font-size: 0.875rem;
}

.floating-header-buttons {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.floating-toggle-controls-btn,
.floating-close-btn {
    background: transparent;
    color: white;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0;
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 0.25rem;
    transition: background 0.2s;
}

.floating-toggle-controls-btn:hover,
.floating-close-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

.floating-window-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    position: relative;
    overflow: hidden;
    min-height: 200px;
}

.floating-window-content img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.floating-window-loading {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-align: center;
}

.floating-window-controls {
    padding: 0;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.floating-navigation-slider {
    padding: 0.5rem 1rem 0.25rem;
}

.floating-nav-section {
    padding: 0.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
}

.floating-nav-buttons {
    display: flex;
    gap: 0.25rem;
}

.floating-nav-buttons button {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

.floating-frame-info {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.floating-window-settings {
    padding: 0.75rem;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.floating-control-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.floating-control-label span:first-child {
    min-width: 90px;
}

.floating-control-label input[type="range"] {
    flex: 1;
}

.floating-control-label input[type="number"] {
    width: 70px;
    padding: 0.25rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    font-size: 0.75rem;
}

.floating-window-settings button {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

.floating-tools-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.floating-tools-row button {
    width: 100%;
}

/* Hide controls when toggled */
.floating-window-controls.hidden,
.floating-window-settings.hidden {
    display: none;
}

/* Viewer Controls Section */
.viewer-controls-section {
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.viewer-controls-section.hidden {
    display: none;
}

.viewer-navigation-slider {
    padding: 0.5rem 1rem 0.25rem;
}

.nav-slider {
    width: 100%;
    cursor: pointer;
}

.frame-input-container {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.frame-input {
    width: 60px;
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    font-size: 0.75rem;
    text-align: center;
}

.frame-total {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Viewer Resize Handle */
.viewer-resize-handle {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, transparent 50%, var(--primary-color) 50%);
    cursor: nwse-resize;
    border-bottom-right-radius: 0.75rem;
    opacity: 0.5;
    transition: opacity 0.2s;
    z-index: 10;
}

.viewer-resize-handle:hover {
    opacity: 1;
}

.viewer-resize-handle::after {
    content: '⇲';
    position: absolute;
    bottom: 1px;
    right: 2px;
    font-size: 0.875rem;
    color: white;
}

/* Footer */
.main-footer {
    background: linear-gradient(#0000 10%, #0d1117 10%);
    color: white;
    padding: 2rem;
    text-align: center;
    margin-top: auto;
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.1);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-credits {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    line-height: 1.6;
}

.footer-credits strong {
    font-weight: 700;
    color: #58a6ff;
}

.footer-lab {
    font-size: 0.875rem;
    opacity: 0.9;
    font-weight: 400;
    margin: 0;
}