:root {
  --blue: #185FA5; --blue-l: #E6F1FB;
  --amber: #BA7517; --green: #0F6E56; --green-l: #E1F5EE;
  --line: #e3e3e3; --text: #1c1c1c; --mut: #6b6b6b; --bg: #f6f7f9;
  --conn: #c6ccd4;
  --card-w: 400px;   /* 课程卡片 / 活动卡片固定宽度 */
  --side-w: 300px;   /* 资料卡片固定宽度 */
  --side-pad: 20px;  /* 卡片与资料卡片列之间的连接区宽度 */
  --axis-x: calc(var(--card-w) + var(--side-pad) / 2);   /* 时间轴位置 = 左列宽 + 列间距的一半 */
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, system-ui, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text);
}
#app { max-width: 1180px; margin: 0 auto; padding: 12px 14px 40px; }
.banner { background: #fff7e6; border-bottom: 1px solid #f0c674; color: #7a5b00; padding: 8px 14px; font-size: 12px; text-align: center; }
.errbox { display: none; background: #fdeaea; color: #a32d2d; border-bottom: 1px solid #e24b4a; padding: 8px 14px; font-size: 13px; }

/* ---------- 顶栏：品牌 / 今天 / 用户 ---------- */
.topbar { display: flex; align-items: center; gap: 10px; padding: 6px 2px 12px; }
.brand { font-weight: 600; font-size: 16px; white-space: nowrap; }
.today {
  margin-left: auto; flex: 0 1 auto; display: flex; align-items: baseline; gap: 5px;
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 3px 11px; cursor: pointer; user-select: none; white-space: nowrap;
}
.today:hover { border-color: #85b7eb; }
.today:focus-visible { outline: 2px solid #85b7eb; outline-offset: 2px; }
.today-d { font-size: 12.5px; font-weight: 600; color: var(--text); font-variant-numeric: tabular-nums; }
.today-w { font-size: 12px; color: var(--blue); }
.user { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--mut); white-space: nowrap; }
.avatar { width: 30px; height: 30px; border-radius: 50%; background: var(--blue-l); color: var(--blue); display: flex; align-items: center; justify-content: center; font-weight: 600; }
.link { background: none; border: none; color: var(--blue); cursor: pointer; font-size: 13px; padding: 0; }

.toolbar { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.toolbar button { padding: 7px 12px; border: 1px solid var(--line); background: #fff; border-radius: 9px; cursor: pointer; font-size: 13px; }
.toolbar .ghost { background: transparent; }
.chk { font-size: 13px; color: var(--mut); display: flex; align-items: center; gap: 5px; }

/* ---------- 时间线 ---------- */
.timeline { position: relative; }
.day { margin-bottom: 24px; }
/* 日期（活动时间）正好落在时间轴蓝点正上方 */
.day-date { position: relative; height: 18px; margin-bottom: 12px; }
.dlabel { position: absolute; top: 0; left: var(--axis-x); transform: translateX(-50%); white-space: nowrap; font-size: 12px; line-height: 18px; color: var(--mut); font-weight: 500; letter-spacing: .2px; border-radius: 999px; padding: 0 6px; }
.wd { margin-left: 5px; color: var(--blue); }
.today-tag { margin-left: 5px; font-size: 10px; background: var(--blue); color: #fff; border-radius: 5px; padding: 1px 5px; vertical-align: 1px; }
.day-today .dlabel { color: var(--blue); font-weight: 600; }
/* 自动定位到的高亮节点 */
.day-focus .dlabel { background: var(--blue-l); color: var(--blue); font-weight: 700; }
.day-focus .day-grid::after { box-shadow: 0 0 0 4px var(--blue-l); }

/* 左列课表（固定宽） : 右列活动（自适应） */
.day-grid { display: grid; grid-template-columns: var(--card-w) minmax(0, 1fr); gap: var(--side-pad); position: relative; }
.day-grid::before { content: ''; position: absolute; left: var(--axis-x); top: 0; bottom: 0; width: 2px; background: var(--line); transform: translateX(-1px); }
.day-grid::after { content: ''; position: absolute; left: var(--axis-x); top: -5px; width: 10px; height: 10px; border-radius: 50%; background: var(--blue); box-shadow: 0 0 0 3px var(--bg); transform: translateX(-50%); }

.course-wrap { display: flex; flex-direction: column; margin-bottom: 8px; }
.course { width: var(--card-w); max-width: 100%; border: 1px solid #cfe0f2; background: #f4f9ff; border-radius: 12px; padding: 10px 12px; }
.chead { display: flex; align-items: center; gap: 4px; }
.ctype { font-size: 11px; border-radius: 6px; padding: 1px 6px; }
.ctype.required { color: var(--blue); border: 1px solid #85b7eb; background: var(--blue-l); }
.ctype.elective { color: #854F0B; border: 1px solid #ef9f27; background: #faeeda; }
.cname { font-size: 14px; font-weight: 600; margin-top: 6px; }
.cmeta { font-size: 12px; color: var(--mut); margin-top: 3px; }
.cfoot { margin-top: 8px; }
/* 课程的资料卡片：挂在课程卡片下方，用左侧竖线连接 */
.cside { display: flex; flex-direction: column; gap: 8px; margin-top: 8px; padding-left: 14px; border-left: 2px solid var(--conn); }
.cside:empty { display: none; }
.cside .subcard::before,
.cside .subcard::after { display: none; }
/* “当天无课”靠右，紧贴时间轴 */
.coursenone { font-size: 12px; color: #b4b2a9; padding: 8px 2px; }
.col-left .coursenone { text-align: right; padding-right: 2px; }
.spacer { flex: 1 1 auto; }
.grow { flex: 1 1 auto; }

/* ---------- 活动卡片（宽度固定，与其他活动一致）---------- */
.card { border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; background: #fff; position: relative; }
.act { display: flex; align-items: flex-start; margin-bottom: 10px; position: relative; }
.act > .card { flex: 0 0 var(--card-w); min-width: 0; }
.card-head { display: flex; align-items: center; gap: 8px; cursor: pointer; user-select: none; }
.card-head:focus-visible { outline: 2px solid #85b7eb; outline-offset: 3px; border-radius: 6px; }
.title { flex: 1 1 auto; min-width: 0; font-weight: 600; font-size: 15px; }
.tag-priv { flex: 0 0 auto; font-size: 11px; color: var(--amber); border: 1px solid #ef9f27; border-radius: 6px; padding: 1px 6px; }
.chev { flex: 0 0 auto; color: #b4b2a9; font-size: 12px; line-height: 1; transform: rotate(-90deg); transition: transform .18s ease; }
.card.open .chev { transform: rotate(0deg); }

/* 折叠区：只放详情正文 */
.card-body { display: none; }
.card.open .card-body { display: block; }
.detail { font-size: 13px; color: var(--mut); margin: 8px 0 0; line-height: 1.6; }
.detail.nodet { color: #b4b2a9; }

/* 常显区：参与状态标签 + 添加资料卡片（折叠后依然可见） */
.card-foot { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: 10px; }
/* 展开区里的编辑/删除 */
.card-acts { display: flex; justify-content: flex-end; gap: 4px; margin-top: 8px; padding-top: 8px; border-top: 1px dashed var(--line); }
.pbtn { border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 3px 11px; font-size: 12.5px; cursor: pointer; }
.pbtn.on { background: var(--green-l); border-color: var(--green); color: var(--green); }
.pbtn.off { background: #fdeaea; border-color: #e24b4a; color: #a32d2d; }
.addcard { background: none; border: 1px dashed var(--line); border-radius: 8px; padding: 3px 10px; font-size: 12.5px; color: var(--mut); cursor: pointer; }
.addcard:hover { border-color: #85b7eb; color: var(--blue); }
.mini { flex: 0 0 auto; background: none; border: none; color: var(--blue); font-size: 12px; cursor: pointer; padding: 2px 4px; border-radius: 5px; white-space: nowrap; }
.mini:hover { background: var(--blue-l); }
.mini.danger { color: #c0392b; }
.mini.danger:hover { background: #fdeaea; }

/* ---------- 资料卡片列：与活动卡片结构化连接（活动 → 横线 → 竖干 → 横线 → 卡片）---------- */
.act-side { flex: 0 0 calc(var(--side-w) + var(--side-pad)); min-width: 0; padding-left: var(--side-pad); position: relative; display: flex; flex-direction: column; gap: 8px; }
.act-side:empty { display: none; }
.act::before { display: none; }
.act.has-cards::before {
  content: ''; position: absolute; left: var(--card-w); top: var(--conn-out, 22px);
  width: calc(var(--side-pad) / 2); height: 2px; background: var(--conn);
}
.act.has-cards > .card::after {
  content: ''; position: absolute; right: -3px; top: calc(var(--conn-out, 22px) - 3px);
  width: 6px; height: 6px; border-radius: 50%; background: var(--conn);
}
.act.has-cards .act-side::before {
  content: ''; position: absolute; left: calc(var(--side-pad) / 2 - 1px); top: var(--conn-out, 22px);
  width: 2px; height: calc(var(--conn-bottom, 60px) - var(--conn-out, 22px)); background: var(--conn); border-radius: 1px;
}
.subcard { position: relative; width: var(--side-w); max-width: 100%; border: 1px dashed var(--line); border-radius: 10px; padding: 8px 10px; background: #fafbfc; }
.subcard.is-private { border-style: solid; border-color: #f0c674; background: #fffaf0; }
.act.has-cards .subcard::before {
  content: ''; position: absolute; right: 100%; top: 15px;
  width: calc(var(--side-pad) / 2); height: 2px; background: var(--conn);
}
.act.has-cards .subcard::after {
  content: ''; position: absolute; right: calc(100% + var(--side-pad) / 2 - 3px); top: 12px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--conn);
}
.sc-head { display: flex; align-items: center; gap: 4px; font-size: 13px; cursor: pointer; user-select: none; }
.sc-head:focus-visible { outline: 2px solid #85b7eb; outline-offset: 2px; border-radius: 6px; }
.sc-title { flex: 1 1 auto; min-width: 0; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sc-chev { flex: 0 0 auto; color: #b4b2a9; font-size: 11px; line-height: 1; transform: rotate(-90deg); transition: transform .18s ease; }
.subcard.open .sc-chev { transform: rotate(0deg); }
.sc-body { display: none; margin-top: 6px; }
.subcard.open .sc-body { display: block; }
.sc-by { color: var(--mut); font-size: 11px; margin-bottom: 3px; }
.sc-text { font-size: 12.5px; color: #333; line-height: 1.55; }
.sc-text.nodet { color: #b4b2a9; }
.sc-acts { display: flex; justify-content: flex-end; gap: 4px; margin-top: 6px; padding-top: 6px; border-top: 1px dashed var(--line); }

/* ---------- Markdown 排版 ---------- */
.md p { margin: 6px 0; }
.md p:first-child { margin-top: 0; }
.md p:last-child { margin-bottom: 0; }
.md h4, .md h5, .md h6 { margin: 10px 0 4px; font-size: 13px; color: var(--text); font-weight: 600; line-height: 1.4; }
.md h4:first-child, .md h5:first-child, .md h6:first-child { margin-top: 0; }
.md ul, .md ol { margin: 6px 0; padding-left: 20px; }
.md li { margin: 2px 0; }
.md code { background: #f0f1f3; border-radius: 4px; padding: 1px 4px; font-size: 12px; font-family: ui-monospace, Menlo, Consolas, monospace; }
.md blockquote { margin: 6px 0; padding: 2px 10px; border-left: 3px solid var(--line); color: var(--mut); }
.md a { color: var(--blue); }
.md hr { border: none; border-top: 1px solid var(--line); margin: 10px 0; }
.md strong { color: var(--text); font-weight: 600; }

.row { display: flex; gap: 8px; }
.row button { flex: 1; padding: 8px; border-radius: 9px; border: 1px solid var(--line); background: #fff; cursor: pointer; font-size: 13px; }
.row .save { background: var(--blue); color: #fff; border-color: var(--blue); }

.auth-card { max-width: 340px; margin: 60px auto; background: #fff; border: 1px solid var(--line); border-radius: 16px; padding: 22px; }
.auth-card h1 { font-size: 18px; margin: 0 0 4px; }
.auth-card .sub { color: var(--mut); font-size: 13px; margin: 0 0 16px; }
.auth-card input { display: block; width: 100%; margin-bottom: 10px; padding: 10px; border: 1px solid var(--line); border-radius: 9px; font-size: 14px; }
.auth-card .row { display: flex; gap: 10px; }
.auth-card .row button { flex: 1; padding: 10px; border-radius: 9px; border: 1px solid var(--line); background: #fff; cursor: pointer; font-size: 14px; }
.auth-card .row #loginBtn { background: var(--blue); color: #fff; border-color: var(--blue); }
.msg { color: #c0392b; font-size: 12px; min-height: 14px; }

.modal { position: fixed; inset: 0; background: rgba(0,0,0,.4); display: flex; align-items: center; justify-content: center; padding: 16px; z-index: 50; overflow: auto; }
.modal-box { background: #fff; border-radius: 16px; padding: 18px; width: 100%; max-width: 380px; }
.modal-box h3 { margin: 0 0 12px; font-size: 16px; }
.modal-box label { display: block; font-size: 13px; color: var(--mut); margin-bottom: 10px; }
.modal-box input, .modal-box textarea, .modal-box select { display: block; width: 100%; margin-top: 4px; padding: 9px; border: 1px solid var(--line); border-radius: 9px; font-size: 14px; font-family: inherit; }
.modal-box textarea { min-height: 90px; resize: vertical; }
.hint { color: #b4b2a9; font-size: 11px; font-weight: 400; }

.loading, .empty { color: var(--mut); font-size: 13px; padding: 20px; text-align: center; }

/* ---------- 中等宽度：并排放不下 400+300 时，资料卡片改挂到卡片下方（竖线连接）---------- */
@media (max-width: 1199px) {
  .act { flex-direction: column; }
  .act > .card { flex: 0 0 auto; width: var(--card-w); max-width: 100%; }
  .act-side {
    flex: none; width: 100%; padding-left: 14px; margin-top: 8px;
    border-left: 2px solid var(--conn);
  }
  .act.has-cards::before,
  .act.has-cards > .card::after,
  .act.has-cards .act-side::before,
  .act.has-cards .subcard::before,
  .act.has-cards .subcard::after { display: none; }
}

/* ---------- 更窄：时间线改为单列（课表在上、活动在下）---------- */
@media (max-width: 859px) {
  .day-grid { grid-template-columns: 1fr; gap: 10px; }
  .day-grid::before { left: 5px; }
  .day-grid::after { left: 5px; }
  .col-left, .col-right { padding-left: 10px; }
  .dlabel { left: 14px; transform: none; }
}

/* ---------- 手机：卡片宽度自适应（不再固定 400/300）---------- */
@media (max-width: 560px) {
  .brand { font-size: 15px; }
  .uname { display: none; }
  #app { padding: 12px 10px 40px; }
  .course, .act > .card, .subcard { width: 100%; }
}