:root {
    --primary-color: #f8fafc;       
    --accent-color: #3b82f6;        
    --accent-hover: #60a5fa;        
    --bg-color: #0f172a;            
    --card-bg: #1e293b;             
    --text-main: #e2e8f0;           
    --text-muted: #94a3b8;          
    --border-color: #334155;        
    --success-color: #10b981;
    --danger-color: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Inter', 'Segoe UI', sans-serif; }

body {
    background: linear-gradient(135deg, #020617 0%, #0f172a 100%);
    background-attachment: fixed;
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 40px 20px;
}

.calculator-wrapper { width: 100%; max-width: 800px; display: flex; flex-direction: column; gap: 30px; margin: 0 auto; }

.container {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.7);
    padding: 40px;
    padding-top: 60px; /* Spațiu dedicat pentru butoanele de sus */
    width: 100%;
    min-height: 550px;
    border: 1px solid rgba(255, 255, 255, 0.05); 
    position: relative;
}

/* BUTOANE ANTET STÂNGA - PĂTRATE ȘI ÎN COLȚ */
.btn-home {
    position: absolute; 
    top: 20px !important;
    background: var(--bg-color); 
    border: 1px solid var(--border-color);
    color: var(--text-muted); 
    width: 40px; 
    height: 40px; 
    border-radius: 8px !important; 
    display: flex; 
    align-items: center; 
    justify-content: center; 
    cursor: pointer;
    transition: all 0.3s; 
    font-size: 16px; 
    z-index: 10;
}
.btn-home:hover { background: var(--accent-color); color: white; border-color: var(--accent-color); box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3); }

/* Poziționare precisă Desktop */
.btn-home { left: 20px !important; }
#btn-feedback { left: 70px !important; }

/* COMUTATOR LIMBĂ DREAPTA SUS - MUTAT ÎN COLȚ */
.language-selector {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 8px;
    z-index: 10;
}
.lang-btn {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s;
}
.lang-btn.active {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

/* HEADER - LOGO ȘI TEXTE */
.app-header { text-align: center; margin-bottom: 40px; margin-top: 10px; }
.brand-logo { max-width: 280px; height: auto; margin-bottom: 15px; filter: brightness(0) invert(1); transition: transform 0.3s ease; }
.brand-logo:hover { transform: scale(1.02); }

.app-header h1 { color: var(--primary-color); font-size: 24px; font-weight: 800; margin-bottom: 5px; }

/* TEXTUL MIC "POWERED BY" REPOZIȚIONAT */
.powered-by { font-size: 10px; color: var(--text-muted); margin-top: 5px; margin-bottom: 15px; text-transform: uppercase; letter-spacing: 0.5px; }
.powered-by a { color: var(--accent-color); text-decoration: none; font-weight: 700; }

.app-subtitle { font-size: 14px; color: var(--text-muted); line-height: 1.6; max-width: 85%; margin: 0 auto 20px auto; }

.beta-badge {
    background: linear-gradient(135deg, #f59e0b, #ea580c);
    color: white; font-size: 11px; padding: 3px 8px; border-radius: 20px;
    vertical-align: middle; position: relative; top: -4px; margin-left: 8px;
}
.version-info {
    font-size: 12px; color: var(--text-muted); font-weight: 600;
    display: flex; align-items: center; justify-content: center; gap: 8px;
    background: var(--bg-color); padding: 8px 16px;
    border-radius: 20px; border: 1px solid var(--border-color); cursor: pointer; transition: all 0.2s ease;
}
.version-info:hover { background: var(--accent-color); color: white; border-color: var(--accent-color); }
.version-info.outline-accent { border-color: var(--accent-color); color: var(--accent-color); }
.version-info.outline-accent:hover { background: rgba(59, 130, 246, 0.1); color: var(--accent-hover); border-color: var(--accent-hover); }

/* PROGRESS STEPS */
.progress-container { display: flex; justify-content: space-between; position: relative; margin-bottom: 50px; }
.progress-container::before { content: ''; position: absolute; top: 15px; left: 10%; right: 10%; height: 2px; background: var(--border-color); z-index: 1; }
.progress-step { position: relative; z-index: 2; display: flex; flex-direction: column; align-items: center; gap: 8px; flex: 1; }
.step-num { width: 32px; height: 32px; background: var(--bg-color); border: 2px solid var(--border-color); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px; color: var(--text-muted); transition: all 0.3s; }
.step-label { font-size: 10px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; text-align: center; }
.progress-step.active .step-num { border-color: var(--accent-color); background: var(--accent-color); color: white; box-shadow: 0 0 10px rgba(59, 130, 246, 0.4); }
.progress-step.active .step-label { color: var(--primary-color); }

/* FORMS */
.step { display: none; animation: fadeIn 0.4s ease; }
.step.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.step h2 { color: var(--primary-color); font-size: 20px; margin-bottom: 25px; display: flex; align-items: center; gap: 10px; padding-bottom: 10px; border-bottom: 2px solid var(--border-color); }
.step h2 i { color: var(--accent-color); }

.form-row { display: flex; gap: 20px; }
.form-group { margin-bottom: 20px; width: 100%; }
.form-group.half { width: 50%; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; font-size: 14px; color: var(--primary-color); }

input, select, textarea {
    width: 100%; padding: 12px 16px; border: 1px solid var(--border-color);
    border-radius: 8px; font-size: 16px; color: var(--text-main); background: var(--bg-color); outline: none; transition: all 0.3s;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent-color); background: var(--card-bg); box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2); }
::placeholder { color: #475569; opacity: 1; }

input[type="number"]::-webkit-inner-spin-button, input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; }

.input-with-icon { position: relative; }
.input-with-icon input { padding-right: 50px; }
.input-with-icon .currency { position: absolute; right: 16px; top: 50%; transform: translateY(-50%); font-weight: 600; font-size: 13px; color: var(--text-muted); pointer-events: none; }

input[type=range] { -webkit-appearance: none; width: 100%; height: 6px; background: var(--border-color); border-radius: 5px; outline: none; margin-top: 10px; padding: 0; }
input[type=range]::-webkit-slider-thumb { -webkit-appearance: none; width: 20px; height: 20px; background: var(--accent-color); border-radius: 50%; cursor: pointer; box-shadow: 0 2px 5px rgba(0,0,0,0.5); }
.highlight-val { color: var(--accent-color); float: right; font-size: 16px; }

/* BUTOANE */
.step-buttons { display: flex; justify-content: space-between; margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.step-buttons.right-align { justify-content: flex-end; }

button { padding: 12px 24px; border-radius: 8px; font-size: 15px; font-weight: 600; cursor: pointer; transition: all 0.2s; display: inline-flex; align-items: center; gap: 8px; border: none; }
.btn-primary, .btn-calculate { background: var(--accent-color); color: white; }
.btn-primary:hover, .btn-calculate:hover { background: var(--accent-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3); }
.btn-secondary { background: var(--bg-color); color: var(--text-main); border: 1px solid var(--border-color); }
.btn-secondary:hover { background: var(--border-color); }
.btn-outline { background: transparent; border: 2px dashed var(--border-color); color: var(--text-muted); width: 100%; justify-content: center; margin-top: 10px; }
.btn-outline:hover { border-color: var(--accent-color); color: var(--accent-color); background: rgba(59, 130, 246, 0.05); }

.btn-calculate { width: 100%; justify-content: center; margin-top: 20px; font-size: 16px; padding: 16px; }
.btn-export { background: var(--accent-color); color: white; width: auto; padding: 14px 30px; }
.btn-export:hover { background: var(--accent-hover); box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4); }

/* ERORI INLINE */
.error-message { color: var(--danger-color); background: rgba(239, 68, 68, 0.1); border: 1px solid rgba(239, 68, 68, 0.3); padding: 12px 16px; border-radius: 8px; margin-top: 15px; font-size: 13px; font-weight: 600; display: none; align-items: center; gap: 8px; }
.input-error { border-color: var(--danger-color) !important; box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2) !important; }

/* CONSUMABILE */
.consumable-row { display: flex; gap: 10px; margin-bottom: 15px; }
.consumable-row input, .consumable-row select { padding: 10px; border: 1px solid var(--border-color); border-radius: 8px; background: var(--bg-color); color: var(--text-main); }
.consumable-category { width: 35%; } .consumable-qty { width: 15%; } .consumable-unit { width: 15%; } .consumable-price { width: 25%; }
.remove-consumable { background: transparent; color: var(--danger-color); border: 1px solid var(--danger-color); padding: 10px 15px; width: 10%; display: flex; justify-content: center; align-items: center; }
.remove-consumable:hover { background: var(--danger-color); color: white; }

/* RESULTS */
.result-card { margin-top: 40px; background: var(--bg-color); border-radius: 12px; padding: 30px; border: 1px solid var(--border-color); }
.result-card h3 { margin-bottom: 20px; color: var(--primary-color); text-align: center; }
.result-table { width: 100%; border-collapse: collapse; }
.result-table td { padding: 12px 0; border-bottom: 1px solid var(--border-color); color: var(--text-main); }
.result-table td:last-child { text-align: right; font-weight: 600; }
.subtotal-row td { font-weight: 700; color: var(--primary-color); border-top: 2px solid var(--border-color); }
.grand-total-row td { padding-top: 20px; font-size: 20px; font-weight: 800; color: var(--accent-color); border: none; }
.profit-row td { font-weight: 700; color: var(--success-color); border-top: 1px dashed var(--border-color); padding-top: 15px; }

/* MODALS */
.modal-overlay { position: fixed; inset: 0; background: rgba(2, 6, 23, 0.8); backdrop-filter: blur(5px); display: none; justify-content: center; align-items: center; z-index: 1000; padding: 15px; }
.modal-content { background: var(--card-bg); border: 1px solid var(--border-color); border-radius: 12px; width: 100%; max-width: 550px; padding: 25px; box-shadow: 0 20px 40px rgba(0,0,0,0.5); }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding-bottom: 15px; border-bottom: 1px solid var(--border-color); margin-bottom: 20px; }
.modal-header h2 { font-size: 18px; color: var(--primary-color); margin: 0; }
.modal-header h2 i { color: var(--accent-color); margin-right: 8px; }
.close-modal { background: transparent; border: none; color: var(--text-muted); font-size: 24px; cursor: pointer; padding: 0; line-height: 1; transition: color 0.2s; }
.close-modal:hover { color: var(--danger-color); }
.modal-body { max-height: 65vh; overflow-y: auto; }
.changelog-item { margin-bottom: 25px; padding-left: 15px; border-left: 2px solid var(--border-color); }
.version-badge { display: inline-block; padding: 4px 10px; border-radius: 12px; font-size: 11px; font-weight: bold; margin-bottom: 10px; position: relative; left: -21px; background: var(--accent-color); color: white; }
.changelog-item ul { list-style: none; padding: 0; margin: 0; }
.changelog-item li { font-size: 13px; color: var(--text-main); margin-bottom: 8px; padding-left: 15px; position: relative; }
.changelog-item li::before { content: "•"; color: var(--accent-color); position: absolute; left: 0; font-weight: bold; }

/* FURNIZORI MODAL & GRID */
.add-supplier-form { background: var(--bg-color); padding: 20px; border-radius: 8px; border: 1px dashed var(--accent-color); margin-bottom: 25px; display: none; animation: fadeIn 0.3s ease; }
.suppliers-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 15px; margin-top: 15px; }
.supplier-card { background: var(--bg-color); border: 1px solid var(--border-color); padding: 15px; border-radius: 8px; display: flex; flex-direction: column; gap: 10px; transition: transform 0.2s; }
.supplier-card:hover { border-color: var(--accent-hover); transform: translateY(-3px); }
.supplier-card h4 { color: var(--primary-color); margin: 0; font-size: 15px; }
.supplier-badge { display: inline-block; padding: 4px 10px; border-radius: 12px; font-size: 10px; font-weight: 700; width: max-content; }
.badge-b2b { background: rgba(239, 68, 68, 0.1); color: var(--danger-color); border: 1px solid var(--danger-color); }
.badge-b2c { background: rgba(16, 185, 129, 0.1); color: var(--success-color); border: 1px solid var(--success-color); }
.supplier-desc { font-size: 12px; color: var(--text-muted); flex-grow: 1; margin: 0; line-height: 1.5; }
.btn-sup-link { text-decoration: none; padding: 8px; font-size: 12px; margin-top: 5px; }

/* FOOTER */
.pro-footer { text-align: center; padding: 20px; color: #64748b; }
.footer-content p { font-size: 14px; margin-bottom: 5px; }
.footer-subtext { font-size: 12px !important; opacity: 0.7; }

/* ====== OPTIMIZARE MOBIL (Anti-Suprapunere) ====== */
@media (max-width: 600px) {
    body { padding: 15px 10px; }
    .container { padding: 25px 15px; padding-top: 80px; min-height: auto; }
    .step-label { display: none; }
    
    .btn-home { top: 15px !important; width: 38px !important; height: 38px !important; left: 15px !important; font-size: 15px !important; }
    #btn-feedback { left: 65px !important; } 
    
    .language-selector { top: 15px !important; right: 15px !important; gap: 6px; }
    .lang-btn { padding: 6px 12px; font-size: 11px; border-radius: 8px; }
    
    .app-header { margin-top: 10px; }
    .app-header h1 { font-size: 20px; }
    .app-subtitle { font-size: 13px; max-width: 100%; margin-top: 10px; }
    .brand-logo { max-width: 180px; margin-bottom: 10px; }
    .powered-by { font-size: 9px; margin-bottom: 15px; margin-top: 5px; }
    
    .form-row { flex-direction: column; gap: 0; }
    .form-group.half { width: 100%; }
    
    .consumable-row { flex-wrap: wrap; background: rgba(0,0,0,0.2); padding: 15px; border-radius: 8px; border: 1px dashed var(--border-color); }
    .consumable-row > * { width: 100% !important; margin-bottom: 10px; }
    .remove-consumable { border: 1px solid var(--danger-color); }
    
    .result-card { padding: 15px; }
    .result-table td { font-size: 13px; }
    .grand-total-row td { font-size: 16px; }
    
    .step-buttons { flex-direction: column-reverse; gap: 10px; }
    .step-buttons button { width: 100%; justify-content: center; }
}