:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --background-color: #f5f7fa;
    --text-color: #333;
    --card-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

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

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px 0;
    border-bottom: 1px solid #ddd;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

main {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
}

section {
    background: white;
    padding: 25px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--secondary-color);
}

.parameters-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.parameters-grid .parameter-group.top-row,
.parameters-grid .parameter-group.middle-row {
    grid-column: span 1;
}

.parameters-grid .parameter-group:not(.top-row):not(.middle-row):not(.left-align) {
    grid-column: span 2;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.parameters-grid .parameter-group.left-align {
    grid-column: span 1;
    max-width: 100%;
    margin-left: 0;
}

.parameter-group {
    margin-bottom: 15px;
}

.calculation-method {
    margin: 25px 0;
    padding: 15px;
    background-color: #f5f9ff;
    border-radius: 6px;
}

.blue-divider {
    height: 2px;
    background-color: var(--secondary-color);
    margin-bottom: 15px;
}

.calculation-method h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 18px;
}

.calculation-method p {
    margin-bottom: 8px;
    line-height: 1.6;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
    color: var(--primary-color);
}

input, select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

/* 隐藏数字输入框默认箭头 */
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;
}

button {
    background-color: var(--secondary-color);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 4px;
    margin-bottom: 20px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

.input-with-buttons {
    display: flex;
    align-items: center;
    width: 100%;
}

.input-with-buttons input {
    flex: 1;
    height: 40px;
    box-sizing: border-box;
    margin-right: 5px;
}

.adjust-btn {
    width: 45px;
    height: 34px;
    font-size: 20px;
    cursor: pointer;
    border: none;
    border-radius: 4px;
    background-color: var(--secondary-color);
    color: white;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 2px;
}

.minus-btn {
    margin-right: 2px;
}

.plus-btn {
    margin-left: 2px;
}

.adjust-btn:hover {
    background-color: #2980b9;
}

.result-display {
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 4px;
    min-height: 150px;
    margin-top: 15px;
}

footer {
    text-align: center;
    margin-top: 50px;
    padding: 20px 0;
    color: #777;
    border-top: 1px solid #ddd;
}

/* DCF表格样式 */
.dcf-results-table, .summary-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
    border: 1px solid #ddd;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.dcf-results-table th, .summary-table th {
    background-color: var(--secondary-color);
    color: white;
    padding: 12px 15px;
    text-align: left;
}

.dcf-results-table td, .summary-table td {
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
}

.dcf-results-table tr:nth-child(even), .summary-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

.dcf-results-table tr:hover, .summary-table tr:hover {
    background-color: #f1f9ff;
}
}

.summary-table .divider-row {
    border-bottom: 2px solid var(--secondary-color);
    font-weight: bold;
}

.dcf-results-table th, .dcf-results-table td,
.summary-table th, .summary-table td {
    padding: 12px 15px;
    text-align: left;
    border: 1px solid #ddd;
}

.dcf-results-table th,
.summary-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
}

.dcf-results-table tr:nth-child(even),
.summary-table tr:nth-child(even) {
    background-color: #f9f9f9;
}

.dcf-results-table .terminal-row {
    background-color: #fff3cd;
    font-weight: bold;
}

.summary-section {
    margin-top: 30px;
}

.error-message {
    color: var(--accent-color);
    padding: 10px;
    text-align: center;
}