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

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 页面头部 Banner */
.grade-header {
    background: linear-gradient(135deg, #2c3e50, #3498db);
    color: white;
    padding: 60px 0;
    padding-top: 180px;
    text-align: center;
    border-radius: 0 0 20px 20px;
    margin-bottom: 50px;
    box-shadow: var(--shadow);
}

.grade-title h1 {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: 1px;
}

.grade-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 20px;
    border-radius: 30px;
    font-size: 14px;
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 15px;
}

.grade-subtitle {
    font-size: 18px;
    opacity: 0.9;
    font-weight: 400;
    margin-bottom: 15px;
}

.grade-intro {
    font-size: 16px;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.92;
}

/* 标题统一样式 */
h3 {
    font-size: 26px;
    color: var(--primary);
    margin: 50px 0 25px;
    padding-bottom: 10px;
    border-bottom: 3px solid var(--accent);
    display: inline-block;
    font-weight: 600;
}

h4 {
    font-size: 19px;
    color: var(--primary);
    margin-bottom: 12px;
    font-weight: 600;
}

h5 {
    font-size: 17px;
    color: var(--accent);
    margin-bottom: 10px;
    font-weight: 500;
}

/* 卡片布局 */
.planning-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
    margin: 25px 0;
}

.planning-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--accent);
    transition: var(--transition);
}

.planning-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.12);
}

.planning-card ul {
    padding-left: 20px;
    color: #444;
}

.planning-card li {
    margin-bottom: 7px;
    line-height: 1.7;
}

/* 核心目标高亮卡片 */
.overview-card.highlight {
    background: var(--accent-light);
    padding: 26px;
    border-radius: var(--radius);
    border-left: 4px solid var(--accent);
    box-shadow: var(--shadow);
    max-width: 750px;
    margin: 0 auto 40px;
}

.overview-card h3 {
    margin-top: 0;
    margin-bottom: 18px;
}

/* 暑期规划 */
.summer-options {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 15px;
}

.planning-card.wide {
    grid-column: 1 / -1;
}

/* 清单与时间轴 */
.checklist-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.checklist-section {
    background: white;
    padding: 22px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

ul.checklist li {
    list-style: none;
    padding-left: 26px;
    position: relative;
    margin-bottom: 8px;
    color: #333;
}

ul.checklist li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: bold;
    font-size: 18px;
}

/* 家长建议 */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
}

.tip-card {
    background: white;
    padding: 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-top: 4px solid var(--accent);
}

.tip-card p {
    color: #555;
    line-height: 1.7;
}

/* 内容区域 */
.services-section {
    background: transparent;
    padding: 0;
}

.grade-overview {
    margin-bottom: 3rem;
}

/* 响应式适配 */
@media (max-width: 992px) {
    .planning-grid,
    .tips-grid,
    .checklist-grid {
        grid-template-columns: 1fr;
    }
    .summer-options {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .grade-title h1 {
        font-size: 32px;
    }
    h3 {
        font-size: 23px;
    }
    .grade-header {
        padding: 45px 0;
        padding-top: 100px;
    }
}