/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

/* 头部样式 */
header {
    background: linear-gradient(to right, #2c3e50, #4a6491);
    color: white;
    padding: 30px;
    text-align: center;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo i {
    font-size: 2.5rem;
    color: #3498db;
}

.logo h1 {
    font-size: 2.2rem;
    font-weight: 700;
}

.subtitle {
    font-size: 1rem;
    opacity: 0.9;
    margin-top: 5px;
}

/* 主内容区 */
main {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 30px;
    padding: 30px;
}

@media (max-width: 900px) {
    main {
        grid-template-columns: 1fr;
    }
}

/* 输入区域 */
.input-section {
    background: #f8f9fa;
    padding: 25px;
    border-radius: 15px;
    border: 1px solid #e9ecef;
}

.input-section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.input-group label {
    display: block;
    margin-bottom: 8px;
    color: #495057;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-with-slider {
    display: flex;
    align-items: center;
    gap: 15px;
}

input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
}

input[type="number"],
select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #dee2e6;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s;
}

input[type="number"]:focus,
select:focus {
    border-color: #3498db;
    outline: none;
}

.unit {
    font-size: 1rem;
    color: #6c757d;
}

/* 按钮 */
.calculate-btn {
    width: 100%;
    padding: 15px;
    background: linear-gradient(to right, #3498db, #2ecc71);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

/* 结果区域 */
.results-section {
    background: white;
    padding: 25px;
    border-radius: 15px;
    border: 1px solid #e9ecef;
}

.results-section h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.results-container {
    min-height: 300px;
    border: 2px dashed #dee2e6;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #6c757d;
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

/* 快递公司卡片 */
.company-card {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 15px;
    border-left: 4px solid #3498db;
    transition: transform 0.2s;
}

.company-card:hover {
    transform: translateX(5px);
}

.company-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.company-name {
    font-weight: 600;
    font-size: 1.2rem;
    color: #2c3e50;
}

.price {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2ecc71;
}

.company-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    font-size: 0.9rem;
    color: #6c757d;
}

/* 汇总区域 */
.summary {
    background: linear-gradient(to right, #2c3e50, #34495e);
    color: white;
    padding: 20px;
    border-radius: 10px;
}

.summary h3 {
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.summary-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.summary-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* 底部 */
footer {
    background: #2c3e50;
    color: #bdc3c7;
    padding: 25px;
}

.footer-content {
    max-width: 1000px;
    margin: 0 auto;
}

.disclaimer h4 {
    color: white;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.disclaimer p {
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.creator-info {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #34495e;
    text-align: center;
}

.tools-used {
    margin-top: 10px;
    font-size: 0.9rem;
    opacity: 0.8;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}