/* GPA计算器样式 */

/* 全局变量 */
:root {
    --primary-color: #667eea;
    --secondary-color: #764ba2;
    --accent-color: #f093fb;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --gray-color: #95a5a6;
    --white-color: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --background-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-background: #ffffff;
    --input-background: #f9f9f9;
    --text-color: #2c3e50;
    --text-secondary: #95a5a6;
    --border-color: #e0e0e0;
    --hover-background: rgba(102, 126, 234, 0.05);
}

/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: var(--transition);
}

.gpa-calculator-section {
    padding: 60px 0;
    background: var(--background-gradient);
    min-height: 100vh;
}

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

/* 页面头部 */
.calculator-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 40px;
    flex-wrap: wrap;
    gap: 20px;
}

.header-content {
    flex: 1;
    min-width: 300px;
}

.calculator-title {
    font-size: 2.8rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 15px;
}

.calculator-title i {
    font-size: 3rem;
}

.calculator-subtitle {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 25px;
    max-width: 800px;
}

.calculator-badge {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.badge-item {
    background: rgba(255,255,255,0.2);
    color: #fff;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.3);
}

.badge-item:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-3px);
}

/* 计算主体 */
.calculator-main {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-bottom: 60px;
}

/* 输入卡片 */
.calculator-inputs {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.calculator-inputs:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
}

/* 模式切换 */
.mode-tabs {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.mode-tab {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid var(--border-color);
    background: var(--card-background);
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.mode-tab:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.mode-tab.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.mode-tab i {
    font-size: 1.2rem;
}

/* 模式内容 */
.mode-content {
    display: none;
}

.mode-content.active {
    display: block;
}

/* 输入区域 */
.input-section {
    margin-bottom: 25px;
}

.section-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    color: var(--primary-color);
    font-size: 1.1rem;
}

.input-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.input-group {
    margin-bottom: 0;
}

.input-group label {
    display: block;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.input-group label i {
    color: var(--primary-color);
    margin-right: 6px;
}

.input-wrapper {
    display: flex;
    align-items: center;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    background: var(--input-background);
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    background: #fff;
}

.input-wrapper input {
    flex: 1;
    padding: 14px 16px;
    border: none;
    font-size: 1rem;
    outline: none;
    background: transparent;
}

.input-suffix {
    padding: 14px 16px;
    background: var(--primary-color);
    color: #fff;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
    background: var(--input-background);
}

.form-control:focus {
    border-color: var(--primary-color);
    background: #fff;
}

/* 课程表格 */
.course-table {
    margin-bottom: 15px;
}

.course-header {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 50px;
    gap: 10px;
    padding: 12px 0;
    font-weight: 600;
    color: var(--text-secondary);
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 10px;
}

.course-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 50px;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
}

.course-row input {
    padding: 12px 14px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
    background: var(--input-background);
}

.course-row input:focus {
    border-color: var(--primary-color);
    background: #fff;
}

.btn-remove {
    padding: 12px;
    border: none;
    background: #ff4757;
    color: #fff;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-remove:hover {
    background: #ff3344;
    transform: scale(1.05);
}

.btn-add {
    width: 100%;
    padding: 12px 20px;
    border: 2px dashed var(--border-color);
    background: var(--input-background);
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-add:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background: var(--hover-background);
}

/* 操作按钮 */
.action-row {
    margin-top: 20px;
}

.btn-calculate {
    width: 100%;
    padding: 16px 24px;
    border: none;
    background: var(--primary-color);
    color: #fff;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-calculate:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.btn-calculate i {
    font-size: 1.2rem;
}

/* 结果展示 */
.result-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px dashed var(--border-color);
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
}

.result-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 25px 20px;
    border-radius: var(--border-radius);
    text-align: center;
    color: #fff;
    transition: var(--transition);
}

.result-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(102, 126, 234, 0.3);
}

.result-card.highlight {
    background: linear-gradient(135deg, #11998e, #38ef7d);
}

.result-card.highlight:hover {
    box-shadow: 0 10px 25px rgba(17, 153, 142, 0.3);
}

.result-icon {
    font-size: 2rem;
    margin-bottom: 12px;
    opacity: 0.9;
}

.result-info {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.result-label {
    font-size: 0.95rem;
    opacity: 0.9;
}

.result-value {
    font-size: 2.2rem;
    font-weight: 700;
}

/* 表格 */
.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 14px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.data-table th {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #fff;
    font-weight: 600;
}

.data-table td {
    color: var(--text-color);
}

.data-table tr:hover td {
    background: var(--hover-background);
}

/* 说明卡片 */
.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.info-card {
    background: var(--card-background);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card-title i {
    color: var(--primary-color);
}

.info-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.info-list li {
    padding: 10px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
    line-height: 1.6;
}

.info-list li:last-child {
    border-bottom: none;
}

/* FAQ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    background: var(--input-background);
}

.faq-question {
    padding: 16px 20px;
    font-weight: 600;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px dashed var(--border-color);
}

.faq-question i {
    color: var(--primary-color);
}

.faq-answer {
    padding: 15px 20px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 响应式 */
@media (max-width: 768px) {
    .gpa-calculator-section {
        padding: 40px 0;
    }

    .calculator-title {
        font-size: 2rem;
    }

    .calculator-title i {
        font-size: 2.5rem;
    }

    .calculator-subtitle {
        font-size: 1rem;
    }

    .calculator-inputs {
        padding: 20px;
    }

    .mode-tabs {
        flex-direction: column;
    }

    .input-row {
        grid-template-columns: 1fr;
    }

    .course-header,
    .course-row {
        grid-template-columns: 1.5fr 1fr 1fr 40px;
        gap: 8px;
    }

    .result-grid {
        grid-template-columns: 1fr;
    }

    .info-cards {
        grid-template-columns: 1fr;
    }
}