.tool-container {
    max-width: 900px;
    margin: 30px auto;
    padding: 24px;
    background: #fff;
}
h1 {
    text-align: center;
    font-size: 24px;
    margin-bottom: 25px;
    color: #1e293b;
}
.box-row {
    display: flex;
    gap: 15px;
    align-items: flex-end;
    margin-bottom: 18px;
}
.form-item {
    flex: 1;
}
label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #333;
}
.select-wrap {
    position: relative;
}
.search-input {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 15px;
    background-color: #fafafa;
    outline: none;
    box-sizing: border-box;
}
.option-list {
    position: absolute;
    left: 0;
    top: 100%;
    width: 100%;
    max-height: 260px;
    overflow-y: auto;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-top: 0;
    border-radius: 0 0 8px 8px;
    z-index: 99;
    display: none;
    box-sizing: border-box;
}
.option-item {
    padding: 9px 12px;
    font-size: 14px;
    cursor: pointer;
}
.option-item:hover {
    background-color: #f0f7ff;
}
.swap-btn {
    padding: 11px 18px;
    background: #2774e7;
    color: #fff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
}
.time-input {
    width: 100%;
    padding: 10px;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 15px;
    margin-bottom: 18px;
    box-sizing: border-box;
}
.btn-calc {
    width: 100%;
    padding: 13px;
    background: #2774e7;
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    margin-bottom: 20px;
}
.result-card {
    background: #f7faff;
    padding: 20px;
    border-radius: 12px;
    line-height: 1.8;
}
.result-card h4 {
    margin: 0 0 10px 0;
    font-size: 16px;
    color: #2774e7;
    border-bottom: 1px solid #dde8f8;
    padding-bottom: 6px;
}
.result-card p {
    margin: 5px 0;
    font-size: 14px;
    color: #333;
}
.tip-text {
    margin-top: 15px;
    padding: 12px;
    background: #ecf4ff;
    border-radius: 8px;
    font-size: 13px;
    color: #2b6cb0;
}