:root {
    --bg-color: #0d0d0f;
    --card-bg: #1a1a1e;
    --accent-color: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.4);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --danger: #ef4444;
    --paper-white: #ffffff;
    --glass-bg: rgba(26, 26, 30, 0.8);
    --glass-border: rgba(255, 255, 255, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow: hidden; height: 100vh; width: 100vw; position: fixed;
}

#app { display: flex; flex-direction: column; height: 100vh; position: relative; }

/* Top Bar */
.top-bar {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 100;
}

.top-main {
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 0.75rem;
    gap: 0.5rem;
}

.logo h1 { font-size: 1.1rem; font-weight: 600; white-space: nowrap; }
.logo h1 span { color: var(--accent-color); }

/* Mode Switcher */
.mode-switcher {
    background: rgba(0,0,0,0.2);
    padding: 4px; border-radius: 12px;
    display: flex; gap: 4px; border: 1px solid var(--glass-border);
}

.mode-btn {
    background: none; border: none; color: var(--text-secondary);
    padding: 0.5rem 0.7rem; border-radius: 8px; font-family: inherit;
    cursor: pointer; display: flex; align-items: center; transition: all 0.2s;
}

.mode-btn.active { background: var(--accent-color); color: white; }
.mode-btn [data-lucide] { width: 20px; height: 20px; }

/* Grid Controls Bar (Secondary) */
.grid-controls-bar {
    height: 60px;
    background: rgba(255,255,255,0.02);
    border-top: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 0.75rem;
    gap: 0.5rem;
}

.grid-inputs-mini { display: flex; gap: 0.5rem; }

.mini-input {
    display: flex; align-items: center; gap: 0.4rem;
    background: rgba(255,255,255,0.05);
    padding: 5px 8px; border-radius: 8px;
    border: 1px solid var(--glass-border);
}

.mini-input span { font-size: 0.75rem; color: var(--text-secondary); text-transform: uppercase; }

.mini-input input {
    width: 35px; background: none; border: none; color: white;
    font-family: inherit; font-size: 0.9rem; outline: none; font-weight: 600;
}

.grid-action-btns { display: flex; gap: 0.5rem; flex: 1; justify-content: flex-end; }

.mini-btn {
    padding: 7px 12px; border-radius: 8px; border: 1px solid var(--glass-border);
    background: rgba(255,255,255,0.05); color: white; font-family: inherit;
    font-size: 0.85rem; cursor: pointer; transition: all 0.2s;
    white-space: nowrap;
}

.mini-btn.accent { background: var(--accent-color); border-color: var(--accent-color); }
.mini-btn:active { transform: scale(0.95); }

.top-actions { display: flex; gap: 0.5rem; }

.icon-btn {
    width: 40px; height: 40px; border-radius: 12px;
    background: rgba(255, 255, 255, 0.05); border: 1px solid var(--glass-border);
    color: white; cursor: pointer; display: flex; align-items: center; justify-content: center;
}
.icon-btn [data-lucide] { width: 20px; height: 20px; }
.icon-btn.danger { color: var(--danger); }

/* Canvas Area */
.canvas-area {
    flex: 1; position: relative; overflow: auto;
    background-image: radial-gradient(rgba(255,255,255,0.05) 1px, transparent 1px);
    background-size: 30px 30px;
}

#sheet-container { 
    padding: 200px; 
    width: max-content; 
    height: max-content; 
}

.a4-sheet {
    --sheet-margin: 0mm;
    width: 210mm; height: 297mm; background: var(--paper-white);
    background-image: 
        linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
    background-size: 10mm 10mm;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
    position: relative; transform-origin: center center;
}

.content-container { 
    position: absolute; 
    top: var(--sheet-margin); 
    left: var(--sheet-margin); 
    right: var(--sheet-margin); 
    bottom: var(--sheet-margin); 
}

/* Grid Styles */
#grid-container { display: grid; gap: 0; }
.grid-cell { border: 1px dashed rgba(0,0,0,0.1); position: relative; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.cell-add-btn { width: 44px; height: 44px; border-radius: 50%; background: var(--paper-white); border: 1px solid var(--accent-color); color: var(--accent-color); display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 5; }

.grid-photo-item { width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; position: relative; cursor: pointer; }
.grid-photo-item.selected { outline: 4px solid var(--accent-color); outline-offset: -4px; z-index: 10; }
.grid-photo-item img { max-width: 100%; max-height: 100%; object-fit: contain; }

.photo-item.selected { z-index: 50 !important; }
.photo-item.selected img { outline: 3px solid var(--accent-color); }

/* Free Items */
.photo-item { position: absolute; touch-action: none; cursor: move; overflow: hidden; }
.photo-item img { 
    position: absolute; top: 0; left: 0; 
    transform-origin: center center;
    width: 100%; height: 100%; 
    display: block; object-fit: cover; pointer-events: none; 
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* FAB */
.fab {
    position: fixed; bottom: 24px; right: 24px; width: 64px; height: 64px;
    border-radius: 50%; background: var(--accent-color); border: none; color: white;
    box-shadow: 0 8px 24px var(--accent-glow); cursor: pointer; z-index: 90;
    display: flex; align-items: center; justify-content: center;
}

/* Bottom Sheet */
.bottom-sheet {
    position: fixed; bottom: 0; left: 0; width: 100%; background: var(--card-bg);
    border-top: 1px solid var(--glass-border); border-radius: 24px 24px 0 0; z-index: 1000;
    transform: translateY(100%); transition: transform 0.4s cubic-bezier(0.32, 0.72, 0, 1);
}
.bottom-sheet:not(.hidden) { transform: translateY(0); }
.sheet-content { padding: 0 1.5rem 2rem; }
.sheet-header { display: flex; justify-content: space-between; align-items: center; margin: 1rem 0; }
.close-btn { width: 44px; height: 44px; background: rgba(255, 255, 255, 0.05); border-radius: 50%; border: 1px solid var(--glass-border); color: var(--text-secondary); display: flex; align-items: center; justify-content: center; cursor: pointer; }

/* Ratios */
.ratio-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
.ratio-btn { padding: 0.75rem 0.5rem; background: rgba(255,255,255,0.04); border: 1px solid var(--glass-border); border-radius: 12px; color: var(--text-primary); font-size: 0.85rem; cursor: pointer; }
.ratio-btn.active { background: rgba(99, 102, 241, 0.15); border-color: var(--accent-color); color: var(--accent-color); }

.action-grid { display: flex; gap: 0.5rem; }
.action-grid button { flex: 1; padding: 0.75rem; background: rgba(255,255,255,0.04); border: 1px solid var(--glass-border); border-radius: 12px; color: white; font-size: 1rem; cursor: pointer; }
.action-grid button.danger { color: var(--danger); }

/* Inputs */
.dim-inputs { display: flex; gap: 1rem; }
.input-wrapper { flex: 1; display: flex; align-items: center; background: rgba(255,255,255,0.05); border: 1px solid var(--glass-border); border-radius: 10px; padding: 0 0.75rem; }
.input-wrapper span { font-size: 0.8rem; color: var(--text-secondary); margin-right: 0.5rem; }
.input-wrapper input { width: 100%; background: none; border: none; color: white; padding: 0.75rem 0; font-family: inherit; font-size: 1rem; outline: none; }

/* Zoom & Loader */
.zoom-controls { position: fixed; bottom: 24px; left: 24px; background: var(--glass-bg); backdrop-filter: blur(10px); padding: 6px; border-radius: 30px; display: flex; align-items: center; gap: 0.75rem; border: 1px solid var(--glass-border); z-index: 80; }
.zoom-controls button { width: 32px; height: 32px; border-radius: 50%; border: none; background: rgba(255,255,255,0.1); color: white; }
#zoom-level { font-size: 0.8rem; font-weight: 600; min-width: 40px; text-align: center; }

#loading-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.8); display: flex; flex-direction: column; align-items: center; justify-content: center; z-index: 2000; gap: 1rem; }
.loader { width: 48px; height: 48px; border: 5px solid var(--accent-color); border-bottom-color: transparent; border-radius: 50%; animation: rotation 1s linear infinite; }
@keyframes rotation { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.hidden { display: none !important; }

@media (max-width: 400px) {
    .logo h1 { display: none; }
    .top-main { padding: 0 0.5rem; }
    .mode-btn { padding: 0.5rem; }
    .top-actions { gap: 0.25rem; }
    .icon-btn { width: 36px; height: 36px; }
    .grid-controls-bar { flex-wrap: wrap; height: auto; padding: 8px; }
    .grid-action-btns { width: 100%; justify-content: space-between; margin-top: 5px; }
}

@media (min-width: 1024px) {
    .bottom-sheet { width: 380px; left: auto; right: 24px; bottom: 100px; border-radius: 20px; transform: translateX(120%); }
    .bottom-sheet:not(.hidden) { transform: translateX(0); }
}

@media print {
    .top-bar, .fab, .bottom-sheet, .zoom-controls, #drop-indicator, .cell-add-btn { display: none !important; }
    body { background: white; overflow: visible; }
    #app { display: block; }
    .canvas-area { padding: 0; overflow: visible; background: none; }
    #sheet-container { padding: 0; }
    .a4-sheet { transform: scale(1) !important; box-shadow: none !important; position: relative !important; margin: 0 !important; background-image: none !important; }
    .grid-cell { border: none; }
}