:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --bg: #f1f5f9;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #cbd5e1;
    --suggested: #16a34a;
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
}

/* BANER GÓRNY */
.header-banner {
    background: white;
    border-radius: 16px;
    box-shadow: 0 4px 25px -5px rgba(0, 0, 0, 0.05);
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 1000px;
    margin-bottom: 20px;
}

.header-logo-center img {
    height: 60px;
    object-fit: contain;
}

.logo-text-fallback {
    margin: 0;
    font-size: 28px;
    color: var(--primary);
    font-weight: 800;
}

.calculator-container {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
    width: 100%;
    max-width: 1000px;
}

.main-title {
    font-size: 22px;
    text-align: center;
    margin-bottom: 20px;
    color: #0f172a;
    margin-top: 0;
}

/* NOWA KRATKA MODUŁÓW */
.module-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 30px;
    background: #e2e8f0;
    padding: 8px;
    border-radius: 12px;
}

.mod-btn {
    padding: 12px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-weight: 700;
    font-size: 13px;
    border-radius: 8px;
    color: #475569;
    transition: all 0.2s;
}

.mod-btn.active {
    background: var(--card-bg);
    color: var(--primary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.06);
}

h2 {
    font-size: 14px;
    margin: 20px 0 10px 0;
    padding-bottom: 5px;
    border-bottom: 2px solid #e2e8f0;
    color: #475569;
    text-transform: uppercase;
}

.calc-layout {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.tabs {
    display: flex;
    gap: 6px;
    margin-bottom: 15px;
    background: #f1f5f9;
    padding: 4px;
    border-radius: 8px;
}

.tab-btn {
    flex: 1;
    padding: 10px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-weight: 600;
    border-radius: 6px;
    color: #64748b;
}

.tab-btn.active {
    background: var(--card-bg);
    color: var(--primary);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.form-group {
    margin-bottom: 14px;
}

label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
    color: #334155;
}

input, .select-style {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 15px;
    background-color: #f8fafc;
    outline: none;
}

input:focus, .select-style:focus {
    border-color: var(--primary);
    background-color: #fff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.calculate-btn {
    width: 100%;
    padding: 15px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    margin-top: 15px;
    transition: background-color 0.2s;
}

.calculate-btn:hover {
    background-color: var(--primary-hover);
}

/* KARTA WYNIKÓW */
.results-box {
    padding: 20px;
    background-color: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
}

.results-box.calculated {
    background-color: #f0fdf4;
    border: 1px solid #bbf7d0;
}

.results-box h3 {
    margin-top: 0;
    font-size: 16px;
    border-bottom: 1px solid #e2e8f0;
    padding-bottom: 8px;
    margin-bottom: 15px;
}

.results-box.calculated h3 {
    color: #166534;
    border-bottom-color: #bbf7d0;
}

.placeholder-text {
    color: #64748b;
    text-align: center;
    padding: 40px 0;
    font-style: italic;
    font-size: 14px;
}

.result-item {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: 8px;
}

.item-val {
    font-weight: 700;
    font-size: 14px;
}

.discount-row {
    color: #15803d;
    font-weight: bold;
}

.variant-card {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    padding: 15px;
    position: relative;
    margin-top: 15px;
}

.variant-card.suggested {
    border: 2px solid var(--suggested);
    background-color: #f6fef9;
}

.badge-suggested {
    position: absolute;
    top: -10px;
    right: 15px;
    background: var(--suggested);
    color: white;
    font-size: 11px;
    font-weight: bold;
    padding: 2px 8px;
    border-radius: 20px;
    text-transform: uppercase;
}

.variant-title {
    font-weight: 700;
    font-size: 14px;
    color: #14532d;
}

.info-note {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 15px;
    font-style: italic;
    line-height: 1.4;
}

.discount-box {
    margin-top: 12px;
    padding: 12px;
    background-color: #fef3c7;
    border: 1px solid #fde68a;
    border-radius: 8px;
    color: #92400e;
    font-size: 12px;
}

@media (min-width: 768px) {
    .module-grid { grid-template-columns: repeat(4, 1fr); }
    .calc-layout { flex-direction: row; align-items: flex-start; }
    .calc-inputs { flex: 1.2; }
    .calc-results-wrapper { flex: 1; position: sticky; top: 20px; }
}/* STOPKA Z PRAWAMI AUTORSKIMI */
.site-footer {
    width: 100%;
    max-width: 1000px;
    text-align: center;
    padding: 20px;
    margin-top: 20px;
    border-top: 1px dashed var(--border);
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.6;
}

.site-footer p {
    margin: 4px 0;
}