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

body {
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    color: #2c3e50;
    line-height: 1.6;
    min-height: 100vh;
}

header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header h1 { font-size: 1.8rem; margin-bottom: 0.3rem; }
.subtitle { opacity: 0.9; font-size: 0.95rem; }

nav {
    background: #34495e;
    padding: 0.8rem 2rem;
}
nav a {
    color: white;
    text-decoration: none;
    margin-right: 1.5rem;
    font-weight: 500;
}
nav a:hover { color: #f39c12; }

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1.5rem;
}

footer {
    text-align: center;
    padding: 1.5rem;
    color: #7f8c8d;
    font-size: 0.9rem;
    margin-top: 3rem;
}

/* Форма */
.calc-form { background: white; padding: 2rem; border-radius: 10px; box-shadow: 0 2px 15px rgba(0,0,0,0.08); }

.oils-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.oil-card {
    border: 2px solid #3498db;
    border-radius: 8px;
    padding: 1.2rem;
    background: #f8f9fa;
}
.oil-card.oil2 { border-color: #e74c3c; }
.oil-card legend {
    font-weight: bold;
    font-size: 1.1rem;
    padding: 0 0.5rem;
}

.oil-card label {
    display: block;
    margin-bottom: 0.8rem;
    font-size: 0.9rem;
    color: #34495e;
}
.oil-card input {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.3rem;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
    font-size: 0.95rem;
}
.oil-card input:focus { outline: none; border-color: #3498db; }

.settings {
    border: 1px solid #95a5a6;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    background: #ecf0f1;
}
.settings legend { font-weight: bold; padding: 0 0.5rem; }
.settings select {
    padding: 0.5rem;
    border-radius: 4px;
    border: 1px solid #bdc3c7;
    font-size: 1rem;
    margin-top: 0.3rem;
}

.btn-primary {
    display: block;
    width: 100%;
    padding: 1rem;
    background: linear-gradient(135deg, #27ae60 0%, #2ecc71 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(39,174,96,0.4); }

.btn-secondary {
    padding: 0.7rem 1.5rem;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    margin-top: 1rem;
}
.btn-secondary:hover { background: #2980b9; }

/* Результаты */
.summary, .plots, .table-section {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}
h2 { color: #2c3e50; margin-bottom: 1rem; border-bottom: 2px solid #3498db; padding-bottom: 0.5rem; }

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}
.metric {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    border-left: 4px solid #3498db;
}
.metric span { display: block; font-size: 0.85rem; color: #7f8c8d; }
.metric b { font-size: 1.3rem; color: #2c3e50; }

.plot-img { width: 100%; border-radius: 8px; }

.table-wrapper { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { padding: 0.6rem; text-align: center; border: 1px solid #ddd; }
th { background: #34495e; color: white; font-weight: 500; }
tbody tr:nth-child(even) { background: #f8f9fa; }
tbody tr:hover { background: #e3f2fd; }

.alert-error {
    background: #fee;
    color: #c33;
    padding: 1rem;
    border-left: 4px solid #c33;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
    .oils-grid { grid-template-columns: 1fr; }
    header h1 { font-size: 1.3rem; }
}

/* ========================================================= */
/* БЛОК ЭКСПЕРТНОГО ЗАКЛЮЧЕНИЯ */
/* ========================================================= */
.verdict-section {
    padding: 2rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    color: white;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.verdict-section h2 {
    color: white;
    border-bottom: 2px solid rgba(255,255,255,0.3);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1.6rem;
}
.verdict-text {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.verdict-ok { background: linear-gradient(135deg, #27ae60 0%, #16a085 100%); }
.verdict-warning { background: linear-gradient(135deg, #f39c12 0%, #e67e22 100%); }
.verdict-danger { background: linear-gradient(135deg, #c0392b 0%, #8e1b1b 100%); }

.optimal-box {
    background: rgba(255,255,255,0.15);
    padding: 1.2rem;
    border-radius: 8px;
    border-left: 4px solid white;
    backdrop-filter: blur(10px);
}
.optimal-ratio {
    display: block;
    font-size: 1.4rem;
    font-weight: bold;
    margin: 0.5rem 0;
}
.optimal-details {
    font-size: 0.95rem;
    opacity: 0.95;
    margin-top: 0.5rem;
}

/* Карточки заключений */
.findings-section {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}
.findings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}
.finding-card {
    padding: 1.2rem;
    border-radius: 8px;
    border-left: 5px solid;
    transition: transform 0.2s;
}
.finding-card:hover { transform: translateY(-3px); }

.finding-ok {
    background: #e8f8f0;
    border-color: #27ae60;
}
.finding-warning {
    background: #fef5e7;
    border-color: #f39c12;
}
.finding-danger {
    background: #fdecea;
    border-color: #c0392b;
}

.finding-header {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    margin-bottom: 0.7rem;
}
.finding-icon {
    font-size: 1.8rem;
}
.finding-header h3 {
    font-size: 1.05rem;
    color: #2c3e50;
    margin: 0;
}
.finding-card p {
    font-size: 0.92rem;
    color: #34495e;
    line-height: 1.5;
    margin: 0;
}

.targets-grid {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px dashed #bdc3c7;
}
.targets-grid h4 {
    color: #2c3e50;
    margin-bottom: 0.8rem;
    font-size: 1rem;
}
.targets-grid label {
    display: inline-block;
    width: 48%;
    margin-bottom: 0.6rem;
    font-size: 0.9rem;
}
.targets-grid input {
    width: 100%;
    padding: 0.4rem;
    margin-top: 0.2rem;
    border: 1px solid #bdc3c7;
    border-radius: 4px;
}

/* ========================================================= */
/* БЛОК CSV ЗАГРУЗКИ/ВЫГРУЗКИ */
/* ========================================================= */
.csv-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.csv-box {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 1.2rem;
    border-radius: 10px;
    border: 2px dashed #adb5bd;
    transition: all 0.3s;
}

.csv-box:hover {
    border-color: #3498db;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
}

.csv-box h3 {
    margin: 0 0 0.5rem 0;
    color: #2c3e50;
    font-size: 1.1rem;
}

.csv-hint {
    font-size: 0.85rem;
    color: #6c757d;
    margin-bottom: 1rem;
}

.csv-upload {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.8rem;
    flex-wrap: wrap;
}

.file-name {
    font-size: 0.85rem;
    color: #495057;
    font-style: italic;
    flex: 1;
    min-width: 150px;
}

.btn-csv-upload,
.btn-csv-load,
.btn-csv-template,
.btn-csv-export {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.btn-csv-upload {
    background: #6c757d;
    color: white;
}
.btn-csv-upload:hover { background: #5a6268; }

.btn-csv-load {
    background: #28a745;
    color: white;
}
.btn-csv-load:hover { background: #218838; }
.btn-csv-load:disabled {
    background: #adb5bd;
    cursor: not-allowed;
}

.btn-csv-template {
    background: #17a2b8;
    color: white;
    width: 100%;
}
.btn-csv-template:hover { background: #138496; }

.btn-csv-export {
    background: #fd7e14;
    color: white;
    width: 100%;
}
.btn-csv-export:hover { background: #e56b00; }

.csv-message {
    padding: 0.8rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    text-align: center;
    font-weight: 500;
    display: none;
}

.csv-message.success {
    display: block;
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.csv-message.error {
    display: block;
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

@media (max-width: 768px) {
    .csv-controls {
        grid-template-columns: 1fr;
    }
    .csv-upload {
        flex-direction: column;
        align-items: stretch;
    }
    .file-name {
        text-align: center;
    }
}

/* ========================================================= */
/* ТЕПЛОВАЯ КАРТА */
/* ========================================================= */
.heatmap-section {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.heatmap-description {
    color: #34495e;
    line-height: 1.6;
    margin-bottom: 1.2rem;
    font-size: 0.95rem;
}

.heatmap-container {
    background: #1a1a1a;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 1.5rem;
}

.heatmap-img {
    max-width: 100%;
    height: auto;
    border-radius: 6px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.heatmap-legend {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 1.2rem;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

.heatmap-legend h3 {
    color: #2c3e50;
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

.heatmap-legend ul {
    list-style: none;
    padding: 0;
    margin: 0 0 1rem 0;
}

.heatmap-legend li {
    padding: 0.4rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: #34495e;
    font-size: 0.93rem;
}

.heatmap-legend li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: #3498db;
    font-weight: bold;
}

.heatmap-tip {
    background: rgba(52, 152, 219, 0.1);
    padding: 0.8rem;
    border-radius: 6px;
    font-size: 0.9rem;
    color: #2c3e50;
    line-height: 1.5;
    margin-top: 0.8rem;
}

.about-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    margin-top: 2rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.about-section h2 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

.about-section h3 {
    color: #34495e;
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    font-size: 1.2rem;
}

.about-content p {
    line-height: 1.7;
    color: #34495e;
    margin-bottom: 1rem;
}

.about-content ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.about-content li {
    margin-bottom: 0.5rem;
    color: #34495e;
    line-height: 1.6;
}

/* ========================================================= */
/* СТРАНИЦА "О МОДЕЛИ" */
/* ========================================================= */
.about-page {
    max-width: 1000px;
    margin: 0 auto;
}

.about-header {
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    color: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    margin-bottom: 2rem;
}

.about-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    border: none;
    color: white;
}

.about-subtitle {
    opacity: 0.9;
    font-size: 1.05rem;
}

.about-section {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 15px rgba(0,0,0,0.08);
}

.about-section h2 {
    color: #2c3e50;
    border-bottom: 2px solid #3498db;
    padding-bottom: 0.5rem;
    margin-bottom: 1.2rem;
    font-size: 1.5rem;
}

.about-section h3 {
    color: #34495e;
    margin-top: 1.5rem;
    margin-bottom: 0.6rem;
    font-size: 1.15rem;
    border-left: 4px solid #3498db;
    padding-left: 0.8rem;
}

.about-section p {
    line-height: 1.7;
    color: #34495e;
    margin-bottom: 0.8rem;
}

.formula {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #3498db;
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
    color: #2c3e50;
    margin: 0.8rem 0;
    text-align: center;
    font-weight: 500;
}

.params-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
    font-size: 0.95rem;
}

.params-table th,
.params-table td {
    padding: 0.7rem;
    text-align: left;
    border: 1px solid #ddd;
}

.params-table th {
    background: #34495e;
    color: white;
    font-weight: 500;
}

.params-table tbody tr:nth-child(even) {
    background: #f8f9fa;
}

.params-table tbody tr:hover {
    background: #e3f2fd;
}

.outputs-list {
    list-style: none;
    padding: 0;
}

.outputs-list li {
    padding: 0.5rem 0;
    padding-left: 0.5rem;
    color: #34495e;
    line-height: 1.6;
}

.applications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.app-card {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 1.2rem;
    border-radius: 8px;
    border-left: 4px solid #3498db;
    transition: transform 0.2s, box-shadow 0.2s;
}

.app-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.app-card h3 {
    color: #2c3e50;
    margin: 0 0 0.5rem 0;
    font-size: 1.05rem;
    border: none;
    padding: 0;
}

.app-card p {
    font-size: 0.9rem;
    margin: 0;
    color: #555;
}

.tech-stack {
    list-style: none;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
}

.tech-stack li {
    background: #f8f9fa;
    padding: 0.6rem 1rem;
    border-radius: 6px;
    border-left: 3px solid #27ae60;
    font-size: 0.95rem;
}

.contacts {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
}

.contact-info {
    background: rgba(255,255,255,0.6);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    line-height: 1.8;
}

.about-cta {
    text-align: center;
    margin: 2rem 0;
}

.about-cta .btn-primary {
    display: inline-block;
    width: auto;
    padding: 1rem 3rem;
    text-decoration: none;
}

@media (max-width: 768px) {
    .about-header h1 {
        font-size: 1.4rem;
    }
    .about-section {
        padding: 1.2rem;
    }
    .formula {
        font-size: 0.95rem;
        padding: 0.8rem;
    }
}