:root {
    --primary-color: #2563eb;
    --success-color: #059669;
    --warning-color: #dc2626;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 600px;
    margin: 20px auto;
}

header {
    text-align: center;
    margin-bottom: 20px;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-muted);
}

.calculator-card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    margin-bottom: 20px;
}

.input-group {
    margin-bottom: 20px;
}

.input-row {
    display: flex;
    gap: 20px;
}

.input-row .input-group {
    flex: 1;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-muted);
}

input[type="text"],
input[type="number"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-main);
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.info-auto {
    background: #eff6ff;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 24px;
    border: 1px solid #dbeafe;
}

.info-auto p {
    font-size: 0.9rem;
    color: #1e40af;
}

.info-auto small {
    display: block;
    color: #3b82f6;
    margin-top: 4px;
}

.btn-calculate {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
}

.btn-calculate:hover {
    background-color: #1d4ed8;
}

.result-box {
    margin-top: 30px;
    padding: 24px;
    border-radius: 12px;
    text-align: center;
}

.better-parcel {
    background-color: #ecfdf5;
    border: 1px solid #10b981;
}

.better-avista {
    background-color: #fff1f2;
    border: 1px solid #f43f5e;
}

.result-box h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.conclusion {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 8px;
}

.better-parcel .conclusion { color: var(--success-color); }
.better-avista .conclusion { color: var(--warning-color); }

.details {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.details h4 {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
}

.details ul {
    list-style: none;
}

.details li {
    display: flex;
    justify-content: space-between;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.ad-container {
    margin: 30px 0;
}

footer {
    margin-top: 60px;
    border-top: 1px solid var(--border-color);
    padding-top: 40px;
}

.seo-article h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.seo-article h3 {
    font-size: 1.2rem;
    margin: 20px 0 10px;
}

.seo-article p {
    margin-bottom: 16px;
    color: var(--text-muted);
}

.copyright {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 40px;
    padding-bottom: 40px;
}

@media (max-width: 480px) {
    .input-row {
        flex-direction: column;
        gap: 0;
    }
}