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

html, body {
    height: 100%;
    margin: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: #ffffff;
    color: #2c3e50;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 700px;
    padding: 40px 20px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.content {
    flex: 1;
    padding-bottom: 60px;
    animation: fadeIn 0.6s ease;
}

/* 返回链接 */
.back-link {
    margin-bottom: 30px;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    color: #666;
    text-decoration: none;
    border: 1px solid #e9ecef;
    border-radius: 6px;
    font-size: 14px;
    transition: all 0.3s ease;
}

.back-btn:hover {
    color: #2c3e50;
    border-color: #2c3e50;
    transform: translateX(-3px);
}

/* 计算器区域 */
.calculator-section {
    animation: fadeInUp 0.6s ease 0.1s both;
}

.page-title {
    font-size: 42px;
    font-weight: 300;
    letter-spacing: 2px;
    margin-bottom: 15px;
    color: #1a1a1a;
}

.page-subtitle {
    font-size: 16px;
    color: #666;
    margin-bottom: 40px;
    font-weight: 300;
}

/* 计算器卡片 */
.calculator-card {
    background: #f8f9fa;
    border: 1px solid #e9ecef;
    border-radius: 8px;
    padding: 30px;
}

/* 表单区域 */
.form-section {
    margin-bottom: 30px;
}

.section-group {
    margin-bottom: 30px;
    padding-bottom: 25px;
    border-bottom: 1px solid #e9ecef;
}

.section-group:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.section-title {
    font-size: 16px;
    font-weight: 500;
    color: #2c3e50;
    margin-bottom: 15px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 10px;
}

.form-row:last-child {
    margin-bottom: 0;
}

label {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

label span {
    font-size: 13px;
    color: #666;
    font-weight: 400;
}

input[type="number"],
select {
    padding: 10px 12px;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    font-size: 14px;
    color: #2c3e50;
    background: #ffffff;
    transition: all 0.3s ease;
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: #2c3e50;
    box-shadow: 0 0 0 3px rgba(44, 62, 80, 0.1);
}

input[type="number"]:hover,
select:hover {
    border-color: #adb5bd;
}

/* 查看规则按钮 */
.rules-button {
    position: absolute;
    top: 30px;
    right: 30px;
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 400;
    background: transparent;
    color: #666;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.rules-button:hover {
    color: #2c3e50;
    border-color: #2c3e50;
    background: #ffffff;
}

/* 计算按钮 */
.calculate-button {
    width: 100%;
    padding: 14px 24px;
    margin-top: 20px;
    font-size: 16px;
    font-weight: 500;
    background: #2c3e50;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.calculate-button:hover {
    background: #1a1a1a;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(44, 62, 80, 0.2);
}

.calculate-button:active {
    transform: translateY(0);
}

/* 结果展示区域 */
.result-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid #e9ecef;
}

.score-display {
    text-align: center;
    padding: 30px 20px;
}

.score-label {
    font-size: 14px;
    color: #999;
    margin-bottom: 15px;
    font-weight: 400;
}

.score-value {
    font-size: 56px;
    font-weight: 300;
    color: #2c3e50;
    margin-bottom: 15px;
    letter-spacing: -1px;
}

.score-rating {
    font-size: 20px;
    font-weight: 400;
    padding: 8px 20px;
    border-radius: 20px;
    display: inline-block;
}

.score-rating.excellent {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.score-rating.good {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.score-rating.average {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
}

.score-rating.poor {
    background: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    color: white;
}

.score-rating.very-poor {
    background: #e9ecef;
    color: #666;
}

/* 模态窗口 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-content {
    background: #ffffff;
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    animation: slideUp 0.3s ease;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 25px;
    border-bottom: 1px solid #e9ecef;
}

.modal-title {
    font-size: 18px;
    font-weight: 500;
    color: #2c3e50;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    color: #999;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s ease;
}

.modal-close:hover {
    color: #2c3e50;
}

.modal-body {
    padding: 25px;
}

.rule-section {
    margin-bottom: 20px;
}

.rule-section:last-child {
    margin-bottom: 0;
}

.rule-section h4 {
    font-size: 15px;
    font-weight: 500;
    color: #2c3e50;
    margin-bottom: 10px;
}

.rule-section p {
    font-size: 13px;
    color: #666;
    line-height: 1.8;
    margin: 5px 0;
    padding-left: 10px;
}

.rule-section.rating-guide {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid #e9ecef;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 20px 0;
    border-top: 1px solid #e9ecef;
    margin-top: auto;
}

.footer p {
    margin: 5px 0;
    font-size: 13px;
    color: #999;
}

.footer a {
    color: #666;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer a:hover {
    color: #2c3e50;
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }

    .page-title {
        font-size: 32px;
    }

    .page-subtitle {
        font-size: 14px;
        margin-bottom: 30px;
    }

    .calculator-card {
        padding: 20px;
        position: relative;
    }

    .rules-button {
        top: 20px;
        right: 20px;
        padding: 6px 12px;
        font-size: 12px;
    }

    .form-row {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .section-title {
        font-size: 15px;
    }

    label span {
        font-size: 12px;
    }

    input[type="number"],
    select {
        padding: 9px 10px;
        font-size: 13px;
    }

    .calculate-button {
        padding: 12px 20px;
        font-size: 15px;
    }

    .score-value {
        font-size: 48px;
    }

    .score-rating {
        font-size: 18px;
        padding: 6px 16px;
    }
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    body {
        background: #1a1a1a;
        color: #e0e0e0;
    }

    .page-title {
        color: #ffffff;
    }

    .page-subtitle {
        color: #999;
    }

    .calculator-card {
        background: #2c2c2c;
        border-color: #404040;
    }

    .section-group {
        border-bottom-color: #404040;
    }

    .section-title {
        color: #ffffff;
    }

    label span {
        color: #999;
    }

    input[type="number"],
    select {
        background: #1a1a1a;
        border-color: #404040;
        color: #e0e0e0;
    }

    input[type="number"]:focus,
    select:focus {
        border-color: #666666;
        box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
    }

    input[type="number"]:hover,
    select:hover {
        border-color: #555555;
    }

    .calculate-button {
        background: #ffffff;
        color: #1a1a1a;
    }

    .calculate-button:hover {
        background: #e0e0e0;
    }

    .rules-button {
        background: transparent;
        color: #999;
        border-color: #404040;
    }

    .rules-button:hover {
        color: #ffffff;
        border-color: #666666;
        background: #333333;
    }

    .modal-content {
        background: #2c2c2c;
    }

    .modal-header {
        border-bottom-color: #404040;
    }

    .modal-title {
        color: #ffffff;
    }

    .modal-close {
        color: #666;
    }

    .modal-close:hover {
        color: #ffffff;
    }

    .rule-section h4 {
        color: #ffffff;
    }

    .rule-section p {
        color: #999;
    }

    .rule-section.rating-guide {
        border-top-color: #404040;
    }

    .result-section {
        border-top-color: #404040;
    }

    .score-label {
        color: #666;
    }

    .score-value {
        color: #ffffff;
    }

    .back-btn {
        color: #999;
        border-color: #404040;
    }

    .back-btn:hover {
        color: #ffffff;
        border-color: #666666;
    }

    .footer {
        border-top-color: #404040;
    }

    .footer p {
        color: #666;
    }

    .footer a {
        color: #999;
    }

    .footer a:hover {
        color: #ffffff;
    }
}