:root {
    --bg-color: #f0f4f8;
    --sidebar-bg: rgba(255, 255, 255, 0.85);
    --card-bg: rgba(255, 255, 255, 0.9);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --border-color: rgba(226, 232, 240, 0.8);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --sidebar-bg: rgba(30, 41, 59, 0.85);
        --card-bg: rgba(30, 41, 59, 0.9);
        --text-primary: #f8fafc;
        --text-secondary: #94a3b8;
        --border-color: rgba(51, 65, 85, 0.8);
    }
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow: hidden; /* App feels like native app */
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    z-index: 10;
    box-shadow: var(--glass-shadow);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.user-section {
    background: rgba(100, 116, 139, 0.05);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 2rem;
    border: 1px solid var(--border-color);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #3b82f6);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.auth-view p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.hidden {
    display: none !important;
}

/* Buttons */
.btn {
    padding: 0.625rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

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

.btn.primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn.secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn.secondary:hover {
    background: rgba(100, 116, 139, 0.1);
}

.btn.danger {
    background: transparent;
    border: 1px solid var(--danger-color);
    color: var(--danger-color);
}

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

.btn.small {
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
}

.full-width {
    width: 100%;
}

.text-left {
    justify-content: flex-start;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 1.25rem;
    transition: var(--transition);
}

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

/* Sections */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.section-header h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.scenes-list {
    list-style: none;
    flex: 1;
    overflow-y: auto;
    margin-bottom: 2rem;
}

.scenes-list li {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 0.25rem;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.scenes-list li:hover {
    background: rgba(100, 116, 139, 0.1);
    color: var(--text-primary);
}

.scenes-list li.active {
    background: var(--primary-color);
    color: white;
}

.tools-actions {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 2rem;
    overflow-y: auto;
    scroll-behavior: smooth;
}

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.main-header h2 {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
}

.board {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.category {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--glass-shadow);
}

.category-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.category-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.bookmarks-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
    min-height: 50px; /* For dropping when empty */
}

.bookmark-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    cursor: grab;
    position: relative;
    overflow: hidden;
}

.bookmark-card:active {
    cursor: grabbing;
}

.bookmark-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border-color: var(--primary-color);
}

.bookmark-card img {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.bookmark-info {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.875rem;
    font-weight: 500;
}

.edit-btn {
    opacity: 0;
    position: absolute;
    right: 2.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.delete-btn {
    opacity: 0;
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.bookmark-card:hover .delete-btn,
.bookmark-card:hover .edit-btn {
    opacity: 1;
}

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

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

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.modal-content {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 16px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    position: relative;
}

.close-btn {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.modal h2 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-color);
    color: var(--text-primary);
    font-family: inherit;
    transition: var(--transition);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.auth-switch {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.auth-switch a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.error-text {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 1rem;
    text-align: center;
}

/* Dragging styles */
.sortable-ghost {
    opacity: 0.4;
}

.sortable-drag {
    cursor: grabbing !important;
}