:root {
    /* Light Theme (Default) */
    --bg-color: #f7f7f7;
    --canvas-bg: #ffffff;
    --text-color: #333333;
    --ui-text: #666666;
    --ui-border: #e0e0e0;
    --sidebar-bg: #ffffff;
    --accent: #222222;
    --hover: #f0f0f0;
}

[data-theme="dark"] {
    --bg-color: #0d0d0d;
    --canvas-bg: #141414;
    --text-color: #e0e0e0;
    --ui-text: #999999;
    --ui-border: #2a2a2a;
    --sidebar-bg: #1a1a1a;
    --accent: #ffffff;
    --hover: #222222;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography & Brand */
.brand-logo {
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    letter-spacing: 2px;
    font-size: 14px;
    color: var(--accent);
    cursor: pointer;
    user-select: none;
}

/* Topbar & Footer Minimal Setup */
.topbar, .footer {
    height: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    background-color: transparent;
    color: var(--ui-text);
    font-size: 12px;
    flex-shrink: 0;
}

.topbar-left, .topbar-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.topbar-divider {
    width: 1px;
    height: 14px;
    background-color: var(--ui-border);
    margin: 0 5px;
}

.doc-title-input {
    background: transparent;
    border: none;
    border-bottom: 1px solid transparent;
    color: var(--ui-text);
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 500;
    padding: 2px 5px;
    width: 200px;
    outline: none;
    transition: color 0.2s, border-bottom 0.2s;
}

.doc-title-input:hover {
    color: var(--accent);
}

.doc-title-input:focus {
    color: var(--text-color);
    border-bottom: 1px solid var(--ui-border);
}

.icon-btn {
    background: none;
    border: none;
    color: var(--ui-text);
    cursor: pointer;
    font-size: 14px;
    transition: color 0.2s ease;
}

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

/* Main Editor Canvas */
.editor-wrapper {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    padding: 20px;
    overflow-y: auto;
}

#editor {
    width: 100%;
    max-width: 800px;
    background-color: var(--canvas-bg);
    color: var(--text-color);
    box-shadow: 0 4px 30px rgba(0,0,0,0.03);
    border: 1px solid var(--ui-border);
    border-radius: 4px;
    padding: 40px;
    font-size: 16px;
    line-height: 1.6;
    outline: none;
    overflow-y: auto;
    transition: background-color 0.3s ease, color 0.3s ease, border 0.3s ease;
}

[data-theme="dark"] #editor {
    box-shadow: 0 4px 30px rgba(0,0,0,0.2);
}

#editor:empty:before {
    content: attr(data-placeholder);
    color: var(--ui-text);
    opacity: 0.5;
    pointer-events: none;
}

/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: -320px;
    width: 320px;
    height: 100vh;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--ui-border);
    box-shadow: 4px 0 30px rgba(0,0,0,0.05);
    z-index: 100;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
}

.sidebar.open {
    left: 0;
}

.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.2);
    opacity: 0;
    visibility: hidden;
    z-index: 90;
    transition: opacity 0.3s ease;
}

[data-theme="dark"] .overlay {
    background: rgba(0,0,0,0.5);
}

.overlay.open {
    opacity: 1;
    visibility: visible;
}

.sidebar-header {
    height: 60px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
    border-bottom: 1px solid var(--ui-border);
}

.sidebar-content {
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Buttons & Inputs */
.btn {
    width: 100%;
    padding: 10px 15px;
    border-radius: 4px;
    border: 1px solid var(--ui-border);
    background: transparent;
    color: var(--text-color);
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s ease;
}

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

.primary-btn {
    background: var(--accent);
    color: var(--bg-color);
    border: none;
    justify-content: center;
}
.primary-btn:hover {
    background: var(--text-color);
    opacity: 0.9;
}

.danger-btn {
    color: #d93025;
}
.danger-btn:hover {
    background: #fce8e6;
    border-color: #fce8e6;
}
[data-theme="dark"] .danger-btn:hover {
    background: rgba(217, 48, 37, 0.1);
}

/* Settings Group */
.settings-group h3 {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--ui-text);
    margin-bottom: 15px;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    font-size: 13px;
}

select, input[type="number"] {
    background: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--ui-border);
    padding: 6px 10px;
    border-radius: 4px;
    outline: none;
    font-family: inherit;
}

.toolbar {
    display: flex;
    gap: 5px;
    background: var(--bg-color);
    padding: 5px;
    border-radius: 6px;
    border: 1px solid var(--ui-border);
    margin-bottom: 15px;
}

.tool-btn {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 6px 0;
    border-radius: 4px;
}

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

.divider {
    width: 1px;
    background: var(--ui-border);
    margin: 0 5px;
}

.color-pickers {
    display: flex;
    gap: 15px;
}

.color-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-size: 12px;
}

input[type="color"] {
    -webkit-appearance: none;
    appearance: none;
    border: 1px solid var(--ui-border);
    width: 100%;
    height: 30px;
    border-radius: 4px;
    cursor: pointer;
    padding: 0;
}
input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}
input[type="color"]::-webkit-color-swatch {
    border: none;
}

/* Info Hover */
.info-hover-container {
    position: relative;
    display: inline-block;
}

.info-tooltip {
    visibility: hidden;
    width: 300px;
    background-color: var(--sidebar-bg);
    color: var(--text-color);
    text-align: left;
    padding: 15px;
    border-radius: 6px;
    border: 1px solid var(--ui-border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    position: absolute;
    z-index: 1;
    top: 150%;
    right: 0;
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 11px;
    line-height: 1.5;
}

.info-hover-container:hover .info-tooltip {
    visibility: visible;
    opacity: 1;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    z-index: 200;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.4);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--sidebar-bg);
    padding: 30px;
    border: 1px solid var(--ui-border);
    border-radius: 8px;
    width: 300px;
    color: var(--text-color);
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    position: relative;
}

.file-manager-content {
    width: 400px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}

.modal-content h2 {
    font-size: 16px;
    margin-bottom: 5px;
}

.modal-subtitle {
    font-size: 11px;
    color: var(--ui-text);
    margin-bottom: 20px;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 20px;
    cursor: pointer;
    color: var(--ui-text);
}

.shortcut-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    font-size: 13px;
}

.shortcut-item {
    display: flex;
    align-items: center;
}

.shortcut-item span {
    margin-left: 10px;
}

kbd {
    background-color: var(--bg-color);
    border: 1px solid var(--ui-border);
    border-radius: 3px;
    padding: 2px 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    box-shadow: 0 1px 1px rgba(0,0,0,0.1);
}

/* File List Styles */
.file-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    overflow-y: auto;
    max-height: 300px;
    padding-right: 5px;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background-color: var(--bg-color);
    border: 1px solid var(--ui-border);
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s;
    font-size: 13px;
    font-weight: 500;
}

.file-item:hover {
    background-color: var(--hover);
}

.delete-file-btn {
    background: none;
    border: none;
    color: var(--ui-text);
    cursor: pointer;
    padding: 5px;
    border-radius: 4px;
    transition: color 0.2s, background-color 0.2s;
}

.delete-file-btn:hover {
    color: #d93025;
    background-color: rgba(217, 48, 37, 0.1);
}

.empty-state {
    text-align: center;
    color: var(--ui-text);
    font-size: 13px;
    padding: 20px 0;
    font-style: italic;
}

/* Toast */
.toast {
    visibility: hidden;
    min-width: 250px;
    max-width: 400px;
    background-color: var(--accent);
    color: var(--bg-color);
    text-align: center;
    border-radius: 4px;
    padding: 16px;
    position: fixed;
    z-index: 300;
    left: 50%;
    bottom: 30px;
    transform: translateX(-50%);
    font-size: 13px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    opacity: 0;
    transition: opacity 0.5s, bottom 0.5s;
}

.toast.show {
    visibility: visible;
    opacity: 1;
    bottom: 50px;
}