/* 核心变量：使用专业的教育蓝 */
:root {
    --primary: #2563eb;
    --primary-light: #eff6ff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --border: #e2e8f0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航 */
.simple-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-weight: 800;
    font-size: 1.2rem;
    color: var(--primary);
}

.tag {
    font-size: 0.8rem;
    background: var(--primary-light);
    color: var(--primary);
    padding: 2px 8px;
    border-radius: 4px;
}

/* Hero 区域 */
.hero {
    padding: 80px 0;
    text-align: center;
}

h1 {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 20px;
}

.highlight {
    color: var(--primary);
    position: relative;
    z-index: 1;
}

.highlight::after {
    content: "";
    position: absolute;
    bottom: 4px;
    left: 0;
    width: 100%;
    height: 12px;
    background: rgba(37, 99, 235, 0.1);
    z-index: -1;
}

.description {
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* 卡片样式 */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    margin-bottom: 32px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

h2 {
    font-size: 1.25rem;
    margin-bottom: 24px;
    color: var(--primary);
    display: flex;
    align-items: center;
}

/* 网格布局 */
.grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.grid-item {
    padding: 20px;
    background: var(--bg-body);
    border-radius: 8px;
}

.icon {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

h3 {
    font-size: 1rem;
    margin-bottom: 8px;
}

/* 时间轴 */
.timeline {
    border-left: 2px solid var(--primary-light);
    padding-left: 24px;
    margin-left: 10px;
}

.t-item {
    position: relative;
    margin-bottom: 32px;
}

.t-item::before {
    content: "";
    position: absolute;
    left: -31px;
    top: 6px;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg-card);
}

.t-week {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

/* 代码预览 */
.code-box {
    background: #1e293b;
    color: #f8fafc;
    padding: 20px;
    border-radius: 8px;
    font-family: Consolas, Monaco, monospace;
    margin: 16px 0;
    font-size: 0.9rem;
    overflow-x: auto;
}

.c1 { color: #94a3b8; } /* tag */
.c2 { color: #38bdf8; } /* class */
.c3 { color: #f472b6; } /* property */
.c4 { color: #fbbf24; } /* value */

/* 列表 */
.check-list {
    list-style: none;
}

.check-list li {
    margin-bottom: 12px;
    padding-left: 28px;
    position: relative;
}

.check-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary);
    font-weight: 800;
}

.note-box {
    margin-top: 24px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* 任务/宗旨网格 */
.mission-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 24px;
}

.mission-item {
    background: var(--primary-light);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

.mission-item h4 {
    color: var(--primary);
    margin-bottom: 8px;
}

.goal-list {
    list-style: none;
    padding-left: 10px;
}

.goal-list li {
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
    font-size: 0.95rem;
}

.goal-list li::before {
    content: "🎯";
    position: absolute;
    left: 0;
}

/* 提案表格 */
.proposal-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 0.9rem;
}

.proposal-table th {
    background: var(--primary-light);
    color: var(--primary);
    text-align: left;
    padding: 12px;
    border-bottom: 2px solid var(--primary);
}

.proposal-table td {
    padding: 12px;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

/* 特色弹性布局 */
.feature-flex {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
}

.feature-item {
    flex: 1;
    min-width: 200px;
    padding: 20px;
    border: 1px dashed var(--primary);
    border-radius: 8px;
    background: #fff;
}

.feature-item strong {
    display: block;
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 1rem;
}

.feature-item p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.ppt-callout {
    text-align: center;
    padding: 30px;
    background: var(--primary);
    color: white;
    border-radius: 12px;
    font-size: 1.2rem;
    margin-top: 40px;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.ppt-callout strong {
    text-decoration: underline;
    margin-left: 8px;
}

footer {
    text-align: center;
    padding: 60px 0;
    color: var(--text-muted);
    font-size: 0.85rem;
}

@media (max-width: 600px) {
    .grid { grid-template-columns: 1fr; }
    h1 { font-size: 2rem; }
}