:root {
    --bg-dark: #0f172a;
    --panel-bg: #1e293b;
    --panel-card: #283548;
    --border: #334155;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --input-bg: #0f172a;
    --workspace-bg: #0b1120;
    --header-gradient: linear-gradient(135deg, #1e293b, #111827);
}

body.light-mode {
    --bg-dark: #f1f5f9;
    --panel-bg: #ffffff;
    --panel-card: #f8fafc;
    --border: #e2e8f0;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --input-bg: #ffffff;
    --workspace-bg: #e2e8f0;
    --header-gradient: linear-gradient(135deg, #ffffff, #f1f5f9);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Inter', system-ui, sans-serif; display: flex; height: 100vh; background: var(--workspace-bg); color: var(--text-main); overflow: hidden; transition: background-color 0.3s, color 0.3s; }

/* Sidebar UI - Premium Design */
.sidebar { width: 340px; background: var(--panel-bg); display: flex; flex-direction: column; border-right: 1px solid var(--border); box-shadow: 2px 0 20px rgba(0,0,0,0.1); z-index: 10; transition: background-color 0.3s, border-color 0.3s; }
.sidebar-header { padding: 1.5rem; background: var(--header-gradient); border-bottom: 1px solid var(--border); }
.header-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.sidebar-header h2 { font-size: 1.4rem; font-weight: 800; color: var(--text-main); display: flex; align-items: center; gap: 8px; letter-spacing: -0.5px; }
.sidebar-header h2 span { font-size: 0.6rem; background: linear-gradient(135deg, var(--accent), #8b5cf6); padding: 3px 8px; border-radius: 20px; color: white; letter-spacing: 1px; text-transform: uppercase; }
.sidebar-header p { font-size: 0.75rem; color: var(--text-muted); font-weight: 500; }

.theme-btn { background: var(--panel-card); border: 1px solid var(--border); color: var(--text-main); padding: 6px; border-radius: 8px; cursor: pointer; font-size: 1.1rem; transition: all 0.2s; display: flex; align-items: center; justify-content: center; }
.theme-btn:hover { border-color: var(--accent); transform: scale(1.05); }

/* Redesigned Settings Container */
.settings-container { padding: 1.25rem; overflow-y: auto; flex: 1; display: flex; flex-direction: column; gap: 1.25rem; }
.settings-container::-webkit-scrollbar { width: 5px; }
.settings-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }

/* Card Style for Sections */
.section-title { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent); margin-bottom: 0.6rem; font-weight: 700; display: flex; align-items: center; gap: 8px; }
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--border); }

.tool-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; background: var(--panel-card); padding: 0.85rem; border-radius: 12px; border: 1px solid var(--border); transition: all 0.3s; }
.tool-grid.single { grid-template-columns: 1fr; }

.control-group { display: flex; flex-direction: column; gap: 4px; }
.control-group.full { grid-column: 1 / -1; }
label { font-size: 0.65rem; color: var(--text-muted); font-weight: 600; white-space: nowrap; text-transform: capitalize; }

/* Sleek Inputs */
select, input { background: var(--input-bg); color: var(--text-main); border: 1px solid var(--border); padding: 0.5rem 0.6rem; border-radius: 6px; font-size: 0.75rem; outline: none; transition: all 0.2s; font-family: inherit; width: 100%; }
select:focus, input:focus { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.15); }
input[type="color"] { padding: 2px; height: 32px; cursor: pointer; }
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 4px; }
input[type="file"] { padding: 0.4rem; background: var(--input-bg); border: 1px dashed var(--accent); font-size: 0.7rem; color: var(--text-muted); }

/* Premium Buttons */
.btn { padding: 0.6rem; border-radius: 6px; font-size: 0.75rem; font-weight: 700; cursor: pointer; text-align: center; transition: all 0.2s; border: 1px solid transparent; text-transform: uppercase; letter-spacing: 0.5px; }
.btn-primary { background: linear-gradient(135deg, var(--accent), #6366f1); color: white; box-shadow: 0 4px 10px rgba(59, 130, 246, 0.2); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 12px rgba(59, 130, 246, 0.3); }
.btn-outline { background: transparent; border-color: var(--border); color: var(--text-muted); }
.btn-outline:hover { background: var(--panel-card); color: var(--text-main); border-color: var(--text-muted); }

.sidebar-footer { padding: 1rem; border-top: 1px solid var(--border); text-align: center; }
.sidebar-footer p { font-size: 0.7rem; color: var(--text-muted); }
.sidebar-footer span { font-weight: 700; color: var(--accent); }

/* Workspace & Canvas */
.workspace { flex: 1; display: flex; flex-direction: column; overflow: hidden; position: relative; background: var(--workspace-bg); }

/* Pagination Bar */
.pagination-bar { background: var(--panel-bg); padding: 0.75rem 1.5rem; border-bottom: 1px solid var(--border); display: flex; gap: 10px; overflow-x: auto; align-items: center; z-index: 5; }
.pagination-bar::-webkit-scrollbar { height: 4px; }
.pagination-bar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.page-btn { background: var(--panel-card); color: var(--text-muted); border: 1px solid var(--border); padding: 0.4rem 0.85rem; border-radius: 20px; font-size: 0.7rem; font-weight: 600; cursor: pointer; transition: all 0.2s; white-space: nowrap; }
.page-btn:hover { background: var(--border); color: var(--text-main); }
.page-btn.active { background: var(--accent); color: white; border-color: var(--accent); }

/* Canvas Area */
.main-canvas { flex: 1; padding: 2rem; overflow-y: auto; display: flex; flex-direction: column; align-items: center; gap: 40px; }
.main-canvas::-webkit-scrollbar { width: 8px; }
.main-canvas::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }

/* Paper Styling */
.page { 
    background-color: var(--paper-bg, white); 
    color: #333; 
    position: relative; 
    overflow: hidden; /* Prevent visual overflow */
    overflow-wrap: break-word; 
    outline: none;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    flex-shrink: 0;
    transform: scale(0.85);
    transform-origin: top center;
    margin-bottom: calc(-0.15 * var(--page-h, 297mm));
    border-radius: 2px;
}

.page-content {
    width: 100%; height: 100%; 
    outline: none; z-index: 2; position: relative;
    overflow: hidden; /* Contain text within padding/bounds */
    word-break: break-word; /* Ensure long words wrap */
}

/* Page Controls */
.page-container { position: relative; display: flex; flex-direction: column; align-items: center; }
.delete-page-btn { position: absolute; right: -50px; top: 20px; background: #ef4444; color: white; border: none; padding: 8px 12px; border-radius: 8px; cursor: pointer; font-size: 0.75rem; font-weight: 700; opacity: 0; transition: all 0.3s; z-index: 5; box-shadow: 0 4px 10px rgba(239, 68, 68, 0.3); }
.page-container:hover .delete-page-btn { opacity: 1; right: -40px; }
.delete-page-btn:hover { background: #dc2626; transform: scale(1.1); }

/* Processing Overlay */
.processing-overlay { position: fixed; inset: 0; background: rgba(15, 23, 42, 0.9); backdrop-filter: blur(8px); z-index: 10000; display: flex; align-items: center; justify-content: center; text-align: center; color: white; }
.processing-content h3 { font-size: 1.5rem; margin-bottom: 0.5rem; background: linear-gradient(135deg, var(--accent), #8b5cf6); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.processing-content p { color: var(--text-muted); font-size: 0.9rem; }

.funny-anim { display: flex; gap: 20px; justify-content: center; margin-bottom: 2rem; }
.funny-anim .emoji { font-size: 3rem; animation: bounce 1.5s infinite ease-in-out; }
.funny-anim .emoji:nth-child(2) { animation-delay: 0.2s; }
.funny-anim .emoji:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(20deg); }
}

/* Authentic Margins via CSS variables set by JS */
.page::before {
    content: ""; position: absolute; left: var(--margin-left, 30mm); top: 0; bottom: 0;
    border-left: var(--margin-width, 1px) var(--margin-style, solid) var(--margin-color, #ffb6c1);
    z-index: 1; pointer-events: none;
}
.page::after {
    content: ""; position: absolute; top: var(--margin-top, 30mm); left: 0; right: 0;
    border-top: var(--margin-width, 2px) var(--margin-style, solid) var(--margin-color, #ffb6c1);
    z-index: 1; pointer-events: none;
}

.page-number-watermark {
    position: absolute; bottom: 8mm; right: 12mm; font-size: 0.8rem; color: rgba(0,0,0,0.25); font-family: 'Inter', sans-serif; font-weight: 600; user-select: none; pointer-events: none; }

.footer-link { background: none; border: none; color: var(--accent); font-size: 0.65rem; text-decoration: underline; cursor: pointer; margin-top: 5px; font-weight: 600; }
.footer-link:hover { color: var(--accent-hover); }

/* Modal Styles */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,0.7); backdrop-filter: blur(5px); z-index: 2000; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal-content { background: var(--panel-bg); border: 1px solid var(--border); border-radius: 16px; width: 100%; max-width: 500px; max-height: 80vh; overflow-y: auto; box-shadow: 0 20px 50px rgba(0,0,0,0.5); display: flex; flex-direction: column; }
.modal-header { padding: 1.25rem; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; position: sticky; top: 0; background: var(--panel-bg); z-index: 1; }
.modal-header h2 { font-size: 1.1rem; color: var(--text-main); }
.modal-body { padding: 1.5rem; display: flex; flex-direction: column; gap: 1rem; color: var(--text-muted); font-size: 0.85rem; line-height: 1.5; }
.modal-body h3 { font-size: 0.95rem; color: var(--accent); margin-bottom: -5px; }
.modal-body a { color: var(--accent); }

/* AI Writer Widget */
.ai-widget { position: absolute; bottom: 80px; right: 20px; width: 320px; background: var(--panel-bg); border: 1px solid var(--border); border-radius: 16px; box-shadow: 0 10px 40px rgba(0,0,0,0.3); z-index: 1000; overflow: hidden; display: flex; flex-direction: column; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1); }
.ai-widget-header { padding: 12px 16px; background: var(--header-gradient); border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.ai-widget-header span { font-size: 0.85rem; font-weight: 700; color: var(--accent); }
.ai-widget-body { padding: 16px; display: flex; flex-direction: column; gap: 12px; }
.ai-widget-body textarea { width: 100%; height: 100px; background: var(--input-bg); color: var(--text-main); border: 1px solid var(--border); border-radius: 8px; padding: 10px; font-size: 0.8rem; resize: none; outline: none; }
.ai-widget-body textarea:focus { border-color: var(--accent); }
.ai-controls { display: flex; gap: 8px; }
.ai-controls select { flex: 1; height: 36px; padding: 0 8px; }
.ai-controls button { flex: 2; height: 36px; padding: 0; font-size: 0.7rem; }

.ai-toggle-btn { position: absolute; bottom: 20px; right: 20px; width: 50px; height: 50px; border-radius: 50%; background: linear-gradient(135deg, var(--accent), #8b5cf6); border: none; color: white; font-size: 1.5rem; cursor: pointer; box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4); z-index: 999; display: flex; align-items: center; justify-content: center; transition: all 0.3s; }
.ai-toggle-btn:hover { transform: scale(1.1) rotate(15deg); }

.close-btn { background: transparent; border: none; color: var(--text-muted); cursor: pointer; font-size: 1.2rem; }
.close-btn:hover { color: var(--text-main); }

/* Context Menu */
.context-menu { position: absolute; background: var(--panel-bg); border: 1px solid var(--border); box-shadow: 0 10px 25px rgba(0,0,0,0.2); border-radius: 10px; z-index: 1000; display: flex; flex-direction: column; gap: 8px; padding: 12px; min-width: 260px; }
.menu-row { display: flex; gap: 8px; width: 100%; align-items: center; }
.ctx-group { flex: 1; display: flex; flex-direction: column; gap: 4px; }
.ctx-group label { font-size: 0.6rem; text-transform: uppercase; color: var(--text-muted); }
.ctx-select { background: var(--input-bg); color: var(--text-main); border: 1px solid var(--border); padding: 4px; border-radius: 4px; font-size: 0.75rem; width: 100%; }
.cmd-btn { background: var(--panel-card); color: var(--text-main); border: 1px solid var(--border); padding: 8px 10px; cursor: pointer; border-radius: 6px; font-size: 0.7rem; flex: 1; text-align: center; transition: all 0.2s; font-family: 'Inter', sans-serif; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; }
.cmd-btn:hover { background: var(--accent); color: white; border-color: var(--accent); transform: translateY(-1px); }
.ctx-input { height: 32px; padding: 2px; border: 1px solid var(--border); border-radius: 4px; cursor: pointer; background: var(--input-bg); width: 100%; }