first commit

app/templates/login.html

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+<!doctype html>
+<html lang="zh-CN">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>登录 · 航标</title>
+  <link rel="stylesheet" href="/static/css/app.css">
+</head>
+<body>
+  <div class="login-wrap">
+    <form class="login-card" method="post" action="/login">
+      <div class="mark">航</div>
+      <h1>航标</h1>
+      <p class="muted">用历史成绩滤波，预估各班后续达线指标。管理员登录后上传成绩表，逐步确认口径，再下达可超越的班级目标。</p>
+      <label>账号</label>
+      <input name="username" value="admin" autocomplete="username">
+      <label>密码</label>
+      <input name="password" type="password" autocomplete="current-password">
+      {% if error %}<div class="err">{{ error }}</div>{% endif %}
+      <div class="actions"><button class="primary" type="submit">进入系统</button></div>
+      <p class="tiny">默认账号 admin / hangbiao2026，请部署后尽快修改 app/config.py。</p>
+    </form>
+  </div>
+</body>
+</html>