:root {
    /* Light Theme (Material Expressive) */
    --primary: #6750A4;
    /* Purple 40 */
    --on-primary: #FFFFFF;
    --primary-container: #EADDFF;
    --on-primary-container: #21005D;

    --secondary: #625B71;
    --on-secondary: #FFFFFF;
    --secondary-container: #E8DEF8;
    --on-secondary-container: #1D192B;

    --tertiary: #7D5260;
    --on-tertiary: #FFFFFF;
    --tertiary-container: #FFD8E4;
    --on-tertiary-container: #31111D;

    --error: #B3261E;
    --on-error: #FFFFFF;
    --error-container: #F9DEDC;
    --on-error-container: #410E0B;

    --background: #FEF7FF;
    --on-background: #1D1B20;
    --surface: #FEF7FF;
    --on-surface: #1D1B20;

    --surface-variant: #E7E0EC;
    --on-surface-variant: #49454F;
    --outline: #79747E;
    --outline-variant: #CAC4D0;

    --shadow-sm: 0px 1px 3px 1px rgba(0, 0, 0, 0.15), 0px 1px 2px 0px rgba(0, 0, 0, 0.3);
    --shadow-md: 0px 4px 8px 3px rgba(0, 0, 0, 0.15), 0px 1px 3px 0px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0px 8px 12px 6px rgba(0, 0, 0, 0.15), 0px 4px 4px 0px rgba(0, 0, 0, 0.3);

    /* Fonts */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-mono: 'Inconsolata', monospace;
}

[data-theme="dark"] {
    /* Dark Theme */
    --primary: #D0BCFF;
    /* Purple 80 */
    --on-primary: #381E72;
    --primary-container: #4F378B;
    --on-primary-container: #EADDFF;

    --secondary: #CCC2DC;
    --on-secondary: #332D41;
    --secondary-container: #4A4458;
    --on-secondary-container: #E8DEF8;

    --tertiary: #EFB8C8;
    --on-tertiary: #492532;
    --tertiary-container: #633B48;
    --on-tertiary-container: #FFD8E4;

    --error: #F2B8B5;
    --on-error: #601410;
    --error-container: #8C1D18;
    --on-error-container: #F9DEDC;

    --background: #141218;
    --on-background: #E6E1E5;
    --surface: #141218;
    --on-surface: #E6E1E5;

    --surface-variant: #49454F;
    --on-surface-variant: #CAC4D0;
    --outline: #938F99;
    --outline-variant: #49454F;

    --shadow-sm: 0px 1px 2px 0px rgba(0, 0, 0, 0.3), 0px 1px 3px 1px rgba(0, 0, 0, 0.15);
    /* Shadows are subtle in dark mode, usually elevation is handled by surface overlay color, but we'll stick to shadow for simplicity or add lightness */
}

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

body {
    font-family: var(--font-body);
    background-color: var(--background);
    color: var(--on-background);
    line-height: 1.6;
    height: 100dvh;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--on-surface);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--outline-variant);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--outline);
}

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

/* Sidebar */
.sidebar {
    width: 300px;
    background-color: var(--surface);
    /* Or surface-container-low */
    border-right: 1px solid var(--outline-variant);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform 0.3s cubic-bezier(0.2, 0.0, 0, 1.0), background-color 0.3s, border-color 0.3s;
}

/* Mobile sidebar overlay backdrop */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 95;
    pointer-events: none;
}

.sidebar-overlay.open {
    display: block;
    opacity: 1;
    pointer-events: auto;
}

.brand {
    padding: 2rem 1.5rem 1rem;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    gap: 0.75rem;
}

.logo-container {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 8px;
}

.brand h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--tertiary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    filter: drop-shadow(0 0 8px rgba(103, 80, 164, 0.3));
    /* Inner glow simulation via text-shadow not possible with transparent text, so we rely on the gradient and drop-shadow for the "glow" effect */
}

.brand .accent {
    color: var(--tertiary);
}

.sidebar-actions {
    padding: 0 1.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

.theme-btn {
    color: var(--on-surface-variant);
    border-radius: 50%;
    padding: 0.5rem;
}

.nav-links {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.nav-btn {
    appearance: none;
    border: none;
    background: none;
    text-align: left;
    padding: 0.75rem 1.25rem;
    border-radius: 100px;
    /* Pillow shape for Material 3 */
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--on-surface-variant);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    font-family: var(--font-heading);
}

.nav-btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--on-surface);
    opacity: 0;
    transition: opacity 0.2s;
}

.nav-btn:hover::before {
    opacity: 0.08;
}

.nav-btn.active {
    background-color: var(--secondary-container);
    color: var(--on-secondary-container);
    font-weight: 600;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--outline-variant);
    font-size: 0.8rem;
    color: var(--on-surface-variant);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.action-text-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    padding: 0.5rem 0;
    color: var(--primary);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.action-text-btn:hover {
    opacity: 0.8;
}

.action-text-btn span {
    font-size: 1.25rem;
}

/* Folder Sections */
.folder-section {
    margin-bottom: 0.5rem;
}

.folder-header {
    appearance: none;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    padding: 0.75rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    color: var(--on-surface);
    transition: background-color 0.2s;
    border-radius: 8px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.folder-icon {
    font-size: 1.25rem;
    color: var(--primary);
}

.folder-name {
    flex: 1;
}

.expand-icon {
    font-size: 1.25rem;
    color: var(--on-surface-variant);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.folder-header.expanded .expand-icon {
    transform: rotate(180deg);
}

.folder-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    padding-left: 0.5rem;
}

.folder-content.expanded {
    max-height: 1000px;
}

.folder-content .nav-btn {
    font-size: 0.9rem;
    padding: 0.65rem 1rem;
    margin-bottom: 0.25rem;
}

.folder-empty {
    padding: 1rem 1.5rem;
    color: var(--on-surface-variant);
    font-size: 0.85rem;
    font-style: italic;
    text-align: center;
}

/* Drag and Drop Styles */
.draggable {
    cursor: grab;
}

.draggable:active {
    cursor: grabbing;
}

.dragging {
    opacity: 0.5;
    transform: scale(0.98);
}

.drag-over {
    border: 2px dashed var(--primary);
    background-color: var(--primary-container);
    opacity: 0.7;
}





/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    background-color: var(--background);
    transition: background-color 0.3s;
}

.top-bar {
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    background-color: var(--surface);
    /* border-bottom: 1px solid var(--outline-variant); */
    /* Removed border for cleaner look, strictly surface color */
    color: var(--on-surface);
    z-index: 10;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

#menu-toggle {
    display: none;
    color: var(--on-surface);
}

#page-title {
    font-size: 1.5rem;
    font-weight: 600;
}

.content-wrapper {
    flex: 1;
    padding: 2rem;
    overflow-y: auto;
}

/* Note Section */
.note-section {
    display: none;
    animation: fadeInUp 0.4s cubic-bezier(0.0, 0.0, 0.2, 1);
}

.note-section.active {
    display: block;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.note-card {
    background: var(--surface);
    border-radius: 24px;
    padding: 2.5rem;
    max-width: 900px;
    margin: 0 auto;
    box-shadow: var(--shadow-sm);
    /* Default low elevation */
    border: 1px solid var(--outline-variant);
    transition: background-color 0.3s, border-color 0.3s, box-shadow 0.3s;
}

[data-theme="dark"] .note-card {
    /* Slightly lighter surface in dark mode for card */
    background: linear-gradient(0deg, var(--primary-container), var(--primary-container)), var(--surface);
    background-blend-mode: overlay;
    background-color: #1E1C24;
    /* Fallback/Base */
    border: none;
}

.note-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--outline-variant);
}

.action-buttons {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.note-header h3 {
    font-size: 1.5rem;
    color: var(--primary);
    margin: 0;
}

.copy-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background-color: var(--primary);
    color: var(--on-primary);
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: 100px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow-sm);
    font-family: var(--font-heading);
}

.copy-btn:hover {
    background-color: var(--primary-container);
    /* Hover state trick - actually opacity usually, but swapping vars works too */
    color: var(--on-primary-container);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.copy-btn:active {
    transform: translateY(0);
}

/* Editor */
.editor-container {
    border: 1px solid var(--outline-variant);
    border-radius: 16px;
    overflow: hidden;
    background-color: var(--surface-variant);
    /* Slightly different background for editor area */
    transition: border-color 0.2s;
}

.editor-container:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-container);
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    padding: 0.75rem;
    background-color: var(--surface);
    border-bottom: 1px solid var(--outline-variant);
    align-items: center;
}

.toolbar-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    color: var(--on-surface-variant);
    font-weight: 600;
    transition: background-color 0.2s, color 0.2s;
}

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

.toolbar-separator {
    width: 1px;
    height: 1.5rem;
    background-color: var(--outline-variant);
    margin: 0 0.5rem;
}

.toolbar-toggle {
    margin-left: auto;
    transition: transform 0.3s ease;
}

.toolbar.collapsed>*:not(.toolbar-toggle) {
    display: none;
}

.toolbar.collapsed {
    padding: 0.25rem 0.75rem;
    justify-content: flex-end;
}

.toolbar-select {
    padding: 0.25rem 0.5rem;
    border-radius: 8px;
    border: 1px solid var(--outline-variant);
    background-color: var(--surface);
    color: var(--on-surface);
    font-family: var(--font-body);
    cursor: pointer;
}

.note-content {
    width: 100%;
    min-height: 400px;
    padding: 2rem;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--on-surface);
    background-color: var(--background);
    /* Inisde editor looks like page background usually, or white */
    outline: none;
    /* overflow-y: auto;  - Let content wrapper handle scrolling */
    font-family: var(--font-body);
    white-space: pre-wrap;
}

.note-content:empty::before {
    content: attr(data-placeholder);
    color: var(--on-surface-variant);
    opacity: 0.7;
    cursor: text;
}

[data-theme="dark"] .note-content {
    background-color: #141218;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--on-surface-variant);
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

/* Delete Specific */
.delete-btn:hover {
    background-color: var(--error-container);
    color: var(--on-error-container);
}

/* Modals */
.modal {
    display: flex;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    justify-content: center;
    align-items: center;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal-content {
    background-color: var(--surface);
    padding: 2rem;
    border-radius: 28px;
    box-shadow: var(--shadow-lg);
    width: 90%;
    max-width: 420px;
    position: relative;
    transform: scale(1);
    transition: transform 0.3s cubic-bezier(0.2, 0, 0, 1);
    border: 1px solid var(--outline-variant);
}

.modal.hidden .modal-content {
    transform: scale(0.9);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--on-surface);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--on-surface-variant);
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 12px;
    color: var(--on-surface-variant);
    font-size: 20px;
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--outline);
    border-radius: 8px;
    /* Slightly rounded */
    font-size: 1rem;
    outline: none;
    background-color: var(--surface);
    color: var(--on-surface);
    transition: all 0.2s;
}

.form-group>input {
    padding-left: 1rem;
}

.form-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-container);
}

.primary-btn {
    width: 100%;
    background-color: var(--primary);
    color: var(--on-primary);
    border: none;
    padding: 0.75rem;
    border-radius: 100px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    font-family: var(--font-heading);
}

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

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(0);
    background-color: var(--on-surface);
    /* Inverse surface usually, or inverse grey */
    color: var(--surface);
    padding: 0.75rem 1.5rem;
    border-radius: 100px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: var(--shadow-lg);
    z-index: 3000;
    opacity: 1;
    transition: all 0.4s cubic-bezier(0.2, 0, 0, 1);
}

.toast.hidden {
    opacity: 0;
    transform: translateX(-50%) translateY(100%);
    pointer-events: none;
}

/* Suggestions */
.suggestion-box {
    position: absolute;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--outline-variant);
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    z-index: 3000;
    max-height: 200px;
    overflow-y: auto;
}

[data-theme="dark"] .suggestion-box {
    background: rgba(30, 28, 36, 0.95);
}

.suggestion-item {
    padding: 0.75rem 1rem;
    color: var(--on-surface);
    cursor: pointer;
    transition: background-color 0.1s;
}

.suggestion-item:hover,
.suggestion-item.active {
    background-color: var(--secondary-container);
    color: var(--on-secondary-container);
}

.user-info {
    padding: 0.5rem 0.75rem;
    margin: 0.5rem 1rem;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--surface-variant), var(--secondary-container));
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: none;
    /* Toggled by JS */
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 15px rgba(103, 80, 164, 0.15),
        inset 0 0 20px rgba(255, 255, 255, 0.5);
    /* Inner glow-ish */
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.user-info::before {
    content: '';
    position: absolute;
    top: 0;
    left: -50%;
    width: 200%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transform: skewX(-20deg);
    animation: shine 6s infinite linear;
    pointer-events: none;
}

@keyframes shine {
    0% {
        left: -100%;
        opacity: 0;
    }

    20% {
        opacity: 1;
    }

    50% {
        left: 100%;
        opacity: 0;
    }

    100% {
        left: 100%;
        opacity: 0;
    }
}

[data-theme="dark"] .user-info {
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3),
        inset 0 0 20px rgba(208, 188, 255, 0.05);
}

[data-theme="dark"] .user-info::before {
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

/* Helpers */
.hidden {
    display: none !important;
}

.mobile-only {
    display: none !important;
}

@media (max-width: 768px) {
    .mobile-only {
        display: flex !important;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .sidebar {
        left: 0;
        transform: translateX(-100%);
        position: fixed;
        height: 100%;
        width: 85%;
        max-width: 320px;
        box-shadow: var(--shadow-lg);
        border-right: none;
        background-color: var(--surface);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .user-info {
        margin: 0.5rem 0.75rem !important;
    }

    .brand {
        padding: 1.5rem 1rem 1rem;
    }

    .sidebar-user-actions {
        padding: 0 0.75rem !important;
    }

    .nav-links {
        padding: 1rem 0.75rem;
    }

    #menu-toggle {
        display: block;
    }

    /* Content Area Optimizations */
    .top-bar {
        padding: 0.75rem 1rem;
    }

    .content-wrapper {
        padding: 0.5rem;
    }

    .note-card {
        padding: 1rem;
        border-radius: 16px;
        /* Make it fit better */
        width: 100%;
    }

    .note-header {
        margin-bottom: 1rem;
        padding-bottom: 0.75rem;
    }

    .note-content {
        padding: 1rem;
    }

    .skeleton-card {
        padding: 1rem;
        border-radius: 16px;
    }
}

.footer-link {
    color: inherit;
    text-decoration: none;
    font-weight: 600;
}

.footer-link:hover {
    text-decoration: underline;
    color: var(--primary);
}

/* Skeleton Loading Styles */
@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }

    100% {
        background-position: 1000px 0;
    }
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }
}

.skeleton {
    animation: shimmer 2s ease-in-out infinite;
    background: linear-gradient(90deg,
            var(--surface-variant) 0%,
            var(--outline-variant) 25%,
            rgba(121, 116, 126, 0.3) 50%,
            var(--outline-variant) 75%,
            var(--surface-variant) 100%);
    background-size: 1000px 100%;
    border-radius: 8px;
    position: relative;
    overflow: hidden;
}

[data-theme="dark"] .skeleton {
    background: linear-gradient(90deg,
            #1E1C24 0%,
            #2A2831 25%,
            rgba(62, 58, 71, 0.5) 50%,
            #2A2831 75%,
            #1E1C24 100%);
    background-size: 1000px 100%;
}

.skeleton-line {
    height: 16px;
    margin-bottom: 12px;
}

.skeleton-line.large {
    height: 24px;
}

.skeleton-line.small {
    height: 12px;
}

.skeleton-rect {
    height: 48px;
}

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

/* Skeleton Folder Section */
.skeleton-folder-section {
    margin-bottom: 1rem;
}

.skeleton-folder-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-folder-icon {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    flex-shrink: 0;
}

.skeleton-folder-name {
    flex: 1;
    height: 14px;
    width: 60%;
    border-radius: 4px;
}

.skeleton-folder-items {
    padding-left: 0.5rem;
}

/* Skeleton Sidebar Item */
.skeleton-sidebar-item {
    padding: 0.65rem 1rem;
    margin-bottom: 0.25rem;
}

.skeleton-sidebar-item .skeleton-line {
    height: 18px;
    width: 80%;
    margin: 0;
    border-radius: 100px;
}


/* --- New Skeleton Loading Styles --- */
.skeleton-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    pointer-events: none;
    transition: opacity 0.4s ease;
    z-index: 5;
}

.skeleton-placeholder.hidden {
    display: none;
}

.skeleton-placeholder.fade-out {
    opacity: 0;
}

/* Shimmer Effect Base */
.skeleton {
    background: linear-gradient(90deg,
            var(--surface-variant) 0%,
            var(--outline-variant) 50%,
            var(--surface-variant) 100%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite linear;
    border-radius: 6px;
    opacity: 0.6;
}

[data-theme="dark"] .skeleton {
    background: linear-gradient(90deg,
            var(--surface-variant) 0%,
            #3e3b44 50%,
            var(--surface-variant) 100%);
}

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

    100% {
        background-position: -200% 0;
    }
}

/* Sidebar Skeleton Specifics */
#sidebar-skeleton-placeholder {
    padding: 0;
    gap: 1.5rem;
}

.skeleton-sidebar-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.skeleton-folder-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0.5rem;
    margin-bottom: 0.25rem;
}

.skeleton-icon {
    width: 24px;
    height: 24px;
    border-radius: 6px;
}

.skeleton-text {
    height: 16px;
    border-radius: 4px;
}

.skeleton-nav-item {
    height: 36px;
    width: 90%;
    margin-left: 1.5rem;
    border-radius: 100px;
    background: var(--surface-variant);
    opacity: 0.4;
}

/* Main Content Skeleton Specifics */
.skeleton-card {
    background: var(--surface);
    border-radius: 24px;
    border: 1px solid var(--outline-variant);
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    box-shadow: var(--shadow-sm);
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

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

.skeleton-title {
    height: 32px;
    width: 40%;
    border-radius: 8px;
}

.skeleton-button {
    height: 36px;
    width: 36px;
    border-radius: 50%;
}

.skeleton-toolbar-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--outline-variant);
    padding-bottom: 1rem;
}

.skeleton-tool-btn {
    width: 32px;
    height: 32px;
    border-radius: 6px;
}

.skeleton-divider {
    width: 1px;
    height: 24px;
    background: var(--outline-variant);
}

.skeleton-tool-select {
    width: 100px;
    height: 32px;
    border-radius: 6px;
}

.skeleton-body {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding-top: 1rem;
}

.skeleton-text-line {
    height: 14px;
    border-radius: 4px;
}




/* Guest Popup */
.popup-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 3000;
    opacity: 1;
    transition: opacity 0.3s ease;
}

.popup-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.popup-content {
    background: var(--surface);
    padding: 2rem;
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    max-width: 320px;
    width: 90%;
    transform: scale(1);
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid var(--outline-variant);
}

.popup-overlay.hidden .popup-content {
    transform: scale(0.9);
}

.popup-icon-wrapper {
    width: 64px;
    height: 64px;
    background: var(--primary-container);
    color: var(--on-primary-container);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.popup-icon-wrapper span {
    font-size: 32px;
}

.popup-content h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--on-surface);
}

.popup-content p {
    color: var(--on-surface-variant);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.popup-actions {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
}

.val-btn {
    padding: 0.75rem 1.25rem;
    border-radius: 100px;
    border: none;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    flex: 1;
    transition: all 0.2s;
    font-family: var(--font-heading);
}

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

.val-btn.primary:hover {
    background: var(--primary-container);
    color: var(--on-primary-container);
}

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


.val-btn.secondary:hover {
    background: var(--surface-variant);
}

/* Empty State Placeholder */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    width: 100%;
    text-align: center;
    color: var(--on-surface-variant);
    padding: 2rem;
    animation: fadeIn 0.5s ease-out;
}

.empty-state.hidden {
    display: none;
}

.empty-state-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.empty-state-icon-wrapper {
    position: relative;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.empty-state-icon {
    width: 80px;
    height: 80px;
    object-fit: contain;
    z-index: 2;
    animation: float 6s ease-in-out infinite;
    filter: drop-shadow(0 10px 15px rgba(0, 0, 0, 0.1));
}

.empty-state-ripple {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--primary-container);
    opacity: 0.3;
    z-index: 1;
    animation: ripple 3s infinite;
}

.empty-state h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0;
    color: var(--on-surface);
}

.empty-state p {
    font-size: 1.1rem;
    color: var(--on-surface-variant);
    max-width: 400px;
    line-height: 1.6;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-15px);
    }

    100% {
        transform: translateY(0px);
    }
}

@keyframes ripple {
    0% {
        width: 80px;
        height: 80px;
        opacity: 0.5;
    }

    100% {
        width: 160px;
        height: 160px;
        opacity: 0;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}