:root {
    --bg-dark: #0a0a0f;
    --bg-card: #12121a;
    --bg-hover: #1a1a25;
    --border: #2a2a3a;
    --primary: #6366f1;
    --secondary: #22d3ee;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text: #e2e8f0;
    --muted: #94a3b8;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Inter', sans-serif; background: var(--bg-dark); color: var(--text); min-height: 100vh; }
a { color: var(--muted); text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.header { background: var(--bg-card); border-bottom: 1px solid var(--border); padding: 1rem 2rem; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 100; }
.logo { display: flex; align-items: center; gap: 0.75rem; font-size: 1.5rem; font-weight: 700; }
.logo i { background: linear-gradient(135deg, #6366f1, #8b5cf6); background-clip: text; -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.logo small { font-size: 0.75rem; color: var(--muted); font-weight: 400; }
.header-actions { display: flex; align-items: center; gap: 1rem; }
.limit-badge { background: var(--bg-dark); padding: 0.5rem 1rem; border-radius: 20px; font-size: 0.875rem; border: 1px solid var(--border); }

.main-container { display: grid; grid-template-columns: 280px 1fr 320px; min-height: calc(100vh - 65px); }

.sidebar { background: var(--bg-card); border-right: 1px solid var(--border); padding: 1.5rem; overflow-y: auto; }
.sidebar-section { margin-bottom: 2rem; }
.sidebar-title { font-size: 0.75rem; font-weight: 600; text-transform: uppercase; color: var(--muted); margin-bottom: 1rem; letter-spacing: 0.5px; }
.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }

.tool-btn { background: var(--bg-dark); border: 1px solid var(--border); border-radius: 12px; padding: 1rem; transition: all 0.2s; text-align: center; color: var(--text); }
.tool-btn:hover { border-color: var(--primary); background: var(--bg-hover); transform: translateY(-2px); }
.tool-btn.active { border-color: var(--primary); background: rgba(99,102,241,0.1); }
.tool-btn i { font-size: 1.5rem; margin-bottom: 0.5rem; display: block; color: var(--primary); }
.tool-btn span { font-size: 0.75rem; color: var(--muted); display: block; }

.template-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }
.template-card { background: var(--bg-dark); border: 1px solid var(--border); border-radius: 12px; padding: 1rem; cursor: pointer; transition: all 0.2s; text-align: center; }
.template-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.template-card i { font-size: 2rem; margin-bottom: 0.5rem; background: linear-gradient(135deg, #6366f1, #8b5cf6); background-clip: text; -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.template-card h5 { font-size: 0.85rem; color: var(--text); }

.history-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
.history-item { aspect-ratio: 1; border-radius: 8px; overflow: hidden; cursor: pointer; border: 2px solid transparent; transition: all 0.2s; }
.history-item:hover { border-color: var(--primary); }
.history-item img { width: 100%; height: 100%; object-fit: cover; }

.workspace { padding: 2rem; display: flex; flex-direction: column; gap: 1.5rem; }
.workspace h2 { font-size: 1.25rem; font-weight: 600; margin-bottom: 1rem; display: flex; align-items: center; gap: 0.5rem; }
.workspace h2 i { color: var(--primary); }

.upload-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
.upload-box { background: var(--bg-card); border: 2px dashed var(--border); border-radius: 16px; padding: 2rem; text-align: center; cursor: pointer; transition: all 0.3s; min-height: 200px; display: flex; flex-direction: column; align-items: center; justify-content: center; position: relative; overflow: hidden; }
.upload-box:hover { border-color: var(--primary); background: var(--bg-hover); }
.upload-box.has-image { border-style: solid; padding: 0; }
.upload-box.has-image img { width: 100%; height: 100%; object-fit: contain; }
.upload-box i { font-size: 3rem; color: var(--primary); margin-bottom: 1rem; }
.upload-box h4 { margin-bottom: 0.5rem; }
.upload-box p { color: var(--muted); font-size: 0.875rem; }

.campaign-form { background: var(--bg-card); border-radius: 16px; padding: 1.5rem; }
.form-group { margin-bottom: 1rem; }
.form-group label { display: block; font-size: 0.8rem; color: var(--muted); margin-bottom: 0.5rem; }
.form-group input, .form-group select, .form-group textarea { width: 100%; background: var(--bg-dark); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem; color: var(--text); font-size: 0.9rem; }
.form-group input:focus, .form-group select:focus { outline: none; border-color: var(--primary); }
.price-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }

.format-selector { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-bottom: 1rem; }
.format-btn { background: var(--bg-dark); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem 1rem; transition: all 0.2s; text-align: center; color: var(--text); }
.format-btn:hover, .format-btn.active { border-color: var(--primary); background: rgba(99,102,241,0.1); }
.format-btn small { display: block; font-size: 0.7rem; color: var(--muted); margin-top: 0.25rem; }

.enhance-options { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.75rem; margin: 1rem 0; }
.enhance-btn { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 1rem; display: flex; align-items: center; gap: 0.5rem; color: var(--text); transition: all 0.2s; }
.enhance-btn:hover { border-color: var(--primary); background: var(--bg-hover); }
.enhance-btn i { color: var(--primary); }

.result-area { background: var(--bg-card); border-radius: 16px; padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.result-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.result-preview { flex: 1; display: flex; align-items: center; justify-content: center; background: var(--bg-dark); border-radius: 12px; min-height: 300px; position: relative; overflow: hidden; }
.result-preview img { max-width: 100%; max-height: 100%; object-fit: contain; }
.placeholder { text-align: center; color: var(--muted); }
.placeholder i { font-size: 4rem; margin-bottom: 1rem; opacity: 0.3; display: block; }

.download-actions { display: flex; gap: 0.5rem; }
.download-actions button { padding: 0.5rem 1rem; border: 1px solid var(--border); background: var(--bg-dark); color: var(--text); border-radius: 8px; display: flex; align-items: center; gap: 0.5rem; transition: all 0.2s; }
.download-actions button:hover { border-color: var(--primary); background: var(--bg-hover); }

.status-bar { background: var(--bg-dark); border-radius: 8px; padding: 0.75rem 1rem; font-size: 0.875rem; display: flex; align-items: center; gap: 0.5rem; margin-top: 1rem; }
.status-bar.success { color: var(--success); }
.status-bar.error { color: var(--danger); }
.status-bar.loading { color: var(--warning); }

.options-panel { background: var(--bg-card); border-left: 1px solid var(--border); padding: 1.5rem; overflow-y: auto; }
.option-section { margin-bottom: 1.5rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border); }
.option-section:last-child { border-bottom: none; }
.option-section h4 { font-size: 0.875rem; font-weight: 600; margin-bottom: 1rem; display: flex; align-items: center; gap: 0.5rem; }
.option-section h4 i { color: var(--primary); }

.bg-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
.bg-item { aspect-ratio: 1; border-radius: 8px; cursor: pointer; border: 2px solid transparent; transition: all 0.2s; }
.bg-item:hover, .bg-item.active { border-color: var(--primary); transform: scale(1.05); }

.angle-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.5rem; }
.angle-grid.extended { grid-template-columns: repeat(4, 1fr); gap: 0.4rem; max-height: 200px; overflow-y: auto; padding-right: 4px; }
.angle-grid.extended::-webkit-scrollbar { width: 4px; }
.angle-grid.extended::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }
.angle-btn { background: var(--bg-dark); border: 1px solid var(--border); border-radius: 8px; padding: 0.75rem; display: flex; align-items: center; gap: 0.5rem; color: var(--text); font-size: 0.8rem; transition: all 0.2s; }
.angle-grid.extended .angle-btn { padding: 0.5rem; font-size: 0.7rem; flex-direction: column; text-align: center; gap: 0.25rem; }
.angle-btn:hover, .angle-btn.active { border-color: var(--primary); background: rgba(99,102,241,0.1); }
.angle-btn i { color: var(--primary); }

/* Scale Slider */
.scale-slider { display: flex; align-items: center; gap: 1rem; }
.scale-slider input[type="range"] { flex: 1; -webkit-appearance: none; appearance: none; background: var(--border); height: 6px; border-radius: 3px; }
.scale-slider input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 18px; height: 18px; background: var(--primary); border-radius: 50%; cursor: pointer; }
.scale-slider span { color: var(--muted); font-size: 0.875rem; min-width: 45px; }

/* Position Grid */
.position-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.25rem; }
.pos-btn { background: var(--bg-dark); border: 1px solid var(--border); border-radius: 6px; padding: 0.5rem; color: var(--muted); transition: all 0.2s; }
.pos-btn:hover, .pos-btn.active { border-color: var(--primary); background: rgba(99,102,241,0.1); color: var(--primary); }

/* Countdown Row */
.countdown-row { display: flex; gap: 0.5rem; }
.countdown-row input { text-align: center; }

/* Campaign Extras */
.campaign-extras { margin-top: 1rem; padding-top: 1rem; border-top: 1px solid var(--border); }

/* Effect Toggles */
.effect-toggles { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.5rem; }
.toggle-item { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; color: var(--muted); cursor: pointer; padding: 0.5rem; background: var(--bg-dark); border-radius: 8px; border: 1px solid var(--border); transition: all 0.2s; }
.toggle-item:hover { border-color: var(--primary); }
.toggle-item input { accent-color: var(--primary); }
.toggle-item input:checked + span { color: var(--text); }

.color-row { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.color-swatch { width: 32px; height: 32px; border-radius: 8px; cursor: pointer; border: 2px solid transparent; transition: all 0.2s; }
.color-swatch:hover, .color-swatch.active { border-color: white; transform: scale(1.1); }

.action-btn { width: 100%; padding: 1rem; border: none; border-radius: 12px; font-size: 1rem; font-weight: 600; display: flex; align-items: center; justify-content: center; gap: 0.5rem; transition: all 0.3s; }
.action-btn.primary { background: linear-gradient(135deg, #6366f1, #8b5cf6); color: white; }
.action-btn.primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(99,102,241,0.3); }
.action-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.spinner { width: 20px; height: 20px; border: 2px solid transparent; border-top-color: currentColor; border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Mobile Toolbar - hidden on desktop */
.mobile-toolbar {
    display: none;
}

/* Mobile FAB - hidden on desktop */
.mobile-fab-container {
    display: none;
}

/* Mobile Overlay */
.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s;
}

.mobile-overlay.active {
    opacity: 1;
}

/* Tablet */
@media (max-width: 1200px) {
    .main-container { grid-template-columns: 260px 1fr; }
    .options-panel { display: none; }
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .header { 
        padding: 0.75rem 1rem; 
        flex-wrap: wrap;
        gap: 0.5rem;
    }
    .logo { font-size: 1.2rem; }
    .logo small { display: none; }
    .header-actions { gap: 0.5rem; }
    .limit-badge { padding: 0.4rem 0.75rem; font-size: 0.75rem; }
    
    /* Mobile Toolbar Visible */
    .mobile-toolbar {
        display: flex;
        background: var(--bg-card);
        border-bottom: 1px solid var(--border);
        padding: 0.5rem;
        gap: 0.5rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .mobile-tool {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.25rem;
        padding: 0.75rem 1rem;
        background: var(--bg-dark);
        border: 1px solid var(--border);
        border-radius: 10px;
        color: var(--muted);
        font-size: 0.7rem;
        white-space: nowrap;
        flex: 1;
        min-width: 70px;
        transition: all 0.2s;
    }
    
    .mobile-tool i {
        font-size: 1.25rem;
        color: var(--primary);
    }
    
    .mobile-tool.active {
        background: rgba(99,102,241,0.15);
        border-color: var(--primary);
        color: var(--text);
    }
    
    /* Mobile FAB Visible */
    .mobile-fab-container {
        display: flex;
        position: fixed;
        bottom: calc(20px + env(safe-area-inset-bottom, 0));
        right: 16px;
        gap: 12px;
        z-index: 100;
    }
    
    .mobile-fab {
        width: 56px;
        height: 56px;
        border-radius: 50%;
        border: none;
        font-size: 20px;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 4px 20px rgba(0,0,0,0.3);
        transition: all 0.2s;
    }
    
    .mobile-fab.primary {
        background: linear-gradient(135deg, #6366f1, #8b5cf6);
        color: white;
    }
    
    .mobile-fab.secondary {
        background: var(--bg-card);
        border: 1px solid var(--border);
        color: var(--text);
    }
    
    .mobile-fab:active {
        transform: scale(0.95);
    }
    
    /* Mobile Overlay */
    .mobile-overlay {
        display: block;
        pointer-events: none;
    }
    
    .mobile-overlay.active {
        pointer-events: auto;
    }
    
    .main-container { 
        grid-template-columns: 1fr; 
        min-height: auto;
        padding-bottom: 100px; /* Space for FAB */
    }
    
    /* Hide desktop sidebar on mobile */
    .sidebar { 
        display: none;
    }
    
    /* Options Panel - Slide up from bottom */
    .options-panel {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        top: auto;
        height: auto;
        max-height: 75vh;
        border-left: none;
        border-top: 1px solid var(--border);
        border-radius: 20px 20px 0 0;
        transform: translateY(100%);
        transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1);
        z-index: 1001;
        display: block;
        padding: 1rem;
        padding-bottom: calc(1rem + env(safe-area-inset-bottom, 0));
        overflow-y: auto;
    }
    
    .options-panel.active { 
        transform: translateY(0); 
    }
    
    .options-panel::before {
        content: '';
        display: block;
        width: 40px;
        height: 4px;
        background: rgba(255,255,255,0.3);
        border-radius: 2px;
        margin: 0 auto 1rem;
    }
    
    .workspace { padding: 1rem; gap: 1rem; }
    .workspace h2 { font-size: 1rem; }
    
    .upload-grid { grid-template-columns: 1fr; gap: 1rem; }
    .upload-box { min-height: 150px; padding: 1.5rem; }
    .upload-box i { font-size: 2rem; }
    
    .campaign-form { padding: 1rem; }
    .form-group input, .form-group select, .form-group textarea { 
        padding: 0.875rem; 
        font-size: 16px; /* Prevent zoom on iOS */
    }
    .price-row { grid-template-columns: 1fr; }
    
    .format-selector { gap: 0.375rem; }
    .format-btn { padding: 0.5rem 0.75rem; font-size: 0.8rem; }
    
    .enhance-options { grid-template-columns: 1fr; }
    
    .result-area { padding: 1rem; }
    .result-preview { min-height: 200px; }
    
    .download-actions { flex-wrap: wrap; }
    .download-actions button { flex: 1; min-width: calc(50% - 0.25rem); justify-content: center; }
    
    .tool-grid { grid-template-columns: repeat(4, 1fr); gap: 0.5rem; }
    .tool-btn { padding: 0.75rem 0.5rem; border-radius: 10px; }
    .tool-btn i { font-size: 1.25rem; margin-bottom: 0.25rem; }
    .tool-btn span { font-size: 0.65rem; }
    
    .template-grid { grid-template-columns: repeat(4, 1fr); }
    .template-card { padding: 0.75rem; }
    .template-card i { font-size: 1.5rem; }
    .template-card h5 { font-size: 0.7rem; }
    
    .bg-grid { grid-template-columns: repeat(4, 1fr); }
    .angle-grid { grid-template-columns: repeat(2, 1fr); }
    .angle-grid.extended { grid-template-columns: repeat(3, 1fr); max-height: 180px; }
    
    /* Scale slider mobile */
    .scale-slider { flex-wrap: wrap; }
    
    /* Position grid mobile */
    .position-grid { gap: 0.5rem; }
    .pos-btn { padding: 0.75rem; }
    
    /* Effect toggles mobile */
    .effect-toggles { grid-template-columns: 1fr; }
}