:root {
    --bg-primary: #1a1a1d; --bg-secondary: #2d2d35; --bg-card: #2a2a32; --accent-primary: #4f9cf9; --accent-danger: #ef4444; --accent-success: #10b981; --text-primary: #f8fafc; --text-secondary: #cbd5e1; --text-muted: #94a3b8; --border-color: #404049;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg-primary); color: var(--text-primary); }
.container { padding: 1rem; max-width: 500px; margin: 0 auto; }
.hidden { display: none !important; }
.text-muted { color: var(--text-muted); }

/* --- Navigation --- */
.tab-nav { display: flex; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); }
.tab-btn { flex: 1; padding: 1rem; background: none; border: none; color: var(--text-muted); font-size: 1rem; cursor: pointer; transition: all 0.2s ease; border-bottom: 2px solid transparent; text-decoration: none; display: flex; align-items: center; justify-content: center; gap: 0.5rem; }
.tab-btn.active { color: var(--accent-primary); border-bottom-color: var(--accent-primary); }

/* --- Cards --- */
.card { background: var(--bg-card); border-radius: 12px; padding: 1.5rem; margin-bottom: 1.5rem; border: 1px solid var(--border-color); }
.card h2 { margin-bottom: 1rem; font-size: 1.2rem; display: flex; align-items: center; gap: 0.5rem; }

/* --- Buttons --- */
.btn { display: flex; align-items: center; justify-content: center; gap: 0.5rem; width: 100%; padding: 0.75rem 1.5rem; margin-bottom: 0.5rem; border: none; border-radius: 8px; font-size: 1rem; font-weight: 500; cursor: pointer; transition: background-color 0.2s ease, transform 0.1s ease; background: var(--accent-primary); color: white; text-decoration: none; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.btn-secondary { background: var(--bg-secondary); border: 1px solid var(--border-color); color: var(--text-secondary); }
.btn.btn-danger { background: var(--accent-danger); }
.btn.btn-stop { background: var(--accent-danger); }
.btn-small { padding: 0.4rem 0.8rem; font-size: 0.8rem; margin-bottom: 0; width: auto; }

/* --- Forms --- */
.form-group { margin-bottom: 1rem; }
.form-label { display: block; margin-bottom: 0.5rem; color: var(--text-secondary); font-size: 0.9rem; }
.form-input, .form-select { width: 100%; padding: 0.75rem; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: 8px; color: var(--text-primary); font-size: 1rem; }
.form-input:focus { outline: none; border-color: var(--accent-primary); }
.form-checkbox { width: auto; margin-right: 0.5rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-grid-triple { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 1rem; }
.manual-form { display: flex; gap: 0.5rem; }
.manual-form .form-input { flex-grow: 1; }
.manual-form .btn { width: auto; }

/* --- Status & Results --- */
.status-message { padding: 1rem; border-radius: 8px; margin-bottom: 1rem; border-left: 4px solid; }
.status-info { background: rgba(79, 156, 249, 0.1); border-color: var(--accent-primary); color: var(--accent-primary); }
.status-success { background: rgba(16, 185, 129, 0.1); border-color: var(--accent-success); color: var(--accent-success); }
.status-error { background: rgba(239, 68, 68, 0.1); border-color: var(--accent-danger); color: var(--accent-danger); }
.info-row { display: flex; justify-content: space-between; padding: 0.75rem 0; border-bottom: 1px solid var(--border-color); }
.info-row:last-child { border-bottom: none; }
.info-label { color: var(--text-muted); }
.info-value { font-weight: 600; text-align: right; }

/* --- Scanner Page --- */
.camera-container { position: relative; width: 100%; min-height: 200px; background-color: #000; border-radius: 8px; overflow: hidden; margin-bottom: 1.5rem; display: flex; align-items: center; justify-content: center; }
#scanner-video { width: 100%; height: 100%; object-fit: cover; display: none; }
.camera-container.active #scanner-video { display: block; }
.placeholder { color: var(--text-muted); text-align: center; }
.camera-container.active .placeholder { display: none; }
.placeholder i { font-size: 3rem; opacity: 0.5; margin-bottom: 1rem; }
.camera-container canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; }

/* --- Upload Page --- */
.upload-area { border: 2px dashed var(--border-color); border-radius: 8px; padding: 2rem; text-align: center; transition: all 0.2s ease; cursor: pointer; }
.upload-area.dragover { border-color: var(--accent-primary); background: rgba(79, 156, 249, 0.05); }
.upload-icon i { font-size: 2.5rem; margin-bottom: 1rem; color: var(--text-muted); }
.file-input { display: none; }
.required-fields { background: var(--bg-secondary); padding: 1rem; border-radius: 8px; margin-bottom: 1.5rem; }
.required-fields h4 { margin-bottom: 0.5rem; }
.required-fields ul { color: var(--text-secondary); font-size: 0.85rem; margin-left: 1rem; }
#file-preview-content table { width: 100%; border-collapse: collapse; font-size: 0.8rem; }
#file-preview-content th, #file-preview-content td { padding: 0.5rem; border: 1px solid var(--border-color); text-align: left; }

/* --- Edit Page --- */
.product-list { max-height: 500px; overflow-y: auto; }
.product-item { background: var(--bg-secondary); border-radius: 8px; padding: 1rem; margin-bottom: 0.75rem; border: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.product-details h4 { margin-bottom: 0.25rem; }
.product-details p { color: var(--text-muted); font-size: 0.8rem; }
.product-actions { display: flex; gap: 0.5rem; }

/* --- Report Page --- */
.clock-display { font-size: 2.5rem; font-weight: 600; text-align: center; letter-spacing: 2px; color: var(--text-primary); }
.report-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.report-btn { margin-bottom: 0; }
.log-history { max-height: 400px; overflow-y: auto; }
.log-item { display: flex; justify-content: space-between; align-items: center; padding: 0.75rem 0; border-bottom: 1px solid var(--border-color); }
.log-item:last-child { border-bottom: none; }
.log-time { color: var(--text-muted); font-size: 0.85rem; }
.log-reason { font-weight: 500; }