/* ============================================================
 * Admin 后台专属样式
 * ============================================================ */

/* ---------- 后台导航 ---------- */
.admin-nav {
  position: sticky; top: 0; z-index: 50;
  height: 56px;
  background: rgba(11, 14, 26, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--c-yellow);
  box-shadow: 0 2px 16px rgba(248, 225, 108, 0.1);
}
.admin-nav-inner {
  height: 100%;
  display: flex; align-items: center; gap: var(--sp-5);
}
.admin-brand {
  display: flex; align-items: center; gap: var(--sp-3);
  font-family: var(--f-display);
  font-weight: 700;
  color: var(--c-text-0);
  text-decoration: none;
  font-size: 21px;
  letter-spacing: 0.04em;
}
.ab-logo {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  background: var(--c-yellow);
  color: var(--c-bg-0);
  font-family: var(--f-mono);
  font-weight: 700;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 75% 100%, 0 100%);
}
.ab-tag {
  font-family: var(--f-mono);
  font-size: 16px;
  color: var(--c-yellow);
  letter-spacing: 0.2em;
  margin-left: var(--sp-2);
  padding-left: var(--sp-3);
  border-left: 1px solid var(--c-line);
}
.admin-nav-links {
  display: flex; align-items: center; gap: 2px;
  list-style: none; padding: 0; margin: 0;
}
.admin-nav-links a {
  padding: 8px 14px;
  font-family: var(--f-mono);
  font-size: 18px;
  letter-spacing: 0.06em;
  color: var(--c-text-1);
  text-decoration: none;
  border-radius: var(--r-sm);
  transition: all var(--t-fast);
}
.admin-nav-links a:hover { color: var(--c-yellow); background: rgba(248, 225, 108, 0.08); }
.admin-nav-right { margin-left: auto; display: flex; align-items: center; gap: var(--sp-3); }
.ab-front {
  font-family: var(--f-mono);
  font-size: 17px;
  color: var(--c-cyan);
  text-decoration: none;
  letter-spacing: 0.08em;
}
.ab-front:hover { color: var(--c-text-0); }
.ab-logout {
  font-family: var(--f-mono);
  font-size: 17px;
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--c-line);
  color: var(--c-text-1);
  cursor: pointer;
  letter-spacing: 0.08em;
  transition: all var(--t-fast);
}
.ab-logout:hover { border-color: var(--c-pink); color: var(--c-pink); }

.admin-main { padding: var(--sp-6) 0 var(--sp-8); }

/* ---------- 后台表格 ---------- */
.admin-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 19px;
}
.admin-table th {
  text-align: left;
  padding: 10px 12px;
  background: var(--c-bg-1);
  border-bottom: 1px solid var(--c-line);
  font-family: var(--f-mono);
  font-size: 17px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-2);
  font-weight: 500;
}
.admin-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--c-line);
  vertical-align: top;
  color: var(--c-text-0);
}
.admin-table tr:hover td { background: rgba(0, 229, 255, 0.04); }
.cell-content {
  max-width: 320px;
  max-height: 60px;
  overflow: hidden;
  color: var(--c-text-1);
  font-size: 12.5px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
}

/* ---------- 表单 ---------- */
.form-input, .form-textarea {
  width: 100%;
  padding: 8px 10px;
  background: var(--c-bg-1);
  border: 1px solid var(--c-line);
  color: var(--c-text-0);
  font-family: var(--f-body);
  font-size: 19px;
  border-radius: var(--r-xs);
  transition: all var(--t-fast);
}
.form-input:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--c-yellow);
  box-shadow: 0 0 0 1px var(--c-yellow);
}
.form-textarea { font-family: var(--f-mono); font-size: 18px; line-height: 1.6; resize: vertical; }

.form-row {
  display: flex; gap: var(--sp-3); flex-wrap: wrap;
  align-items: flex-start;
}
.form-cell { display: flex; flex-direction: column; gap: 4px; min-width: 140px; width: 100%; }
.login-form { display: flex; flex-direction: column; }
.form-cell-grow { flex: 1; min-width: 200px; }
.form-cell label {
  font-family: var(--f-mono);
  font-size: 16px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-text-2);
}

.filter-bar {
  margin-bottom: var(--sp-4);
  padding: var(--sp-4);
  background: var(--c-bg-1);
  border: 1px solid var(--c-line);
}

.admin-form { margin-bottom: var(--sp-6); }

/* ---------- 题目编辑卡 ---------- */
.task-edit-card {
  background: var(--c-bg-1);
  border: 1px solid var(--c-line);
  padding: var(--sp-4);
  margin-bottom: var(--sp-3);
  position: relative;
}
.task-edit-card.task-new { border-color: var(--c-green); background: rgba(77, 224, 168, 0.04); }
.task-edit-card:hover { border-color: var(--c-line-soft); }
.te-head {
  display: flex; align-items: center; gap: var(--sp-3);
  margin-bottom: var(--sp-3);
  padding-bottom: var(--sp-3);
  border-bottom: 1px solid var(--c-line);
}
.te-id { font-family: var(--f-mono); font-size: 20px; color: var(--c-text-2); }
.te-day { font-family: var(--f-mono); font-size: 18px; padding: 2px 8px; }
.te-meta { font-family: var(--f-mono); font-size: 17px; color: var(--c-text-2); letter-spacing: 0.08em; }
.ab-del {
  font-family: var(--f-mono);
  font-size: 17px;
  padding: 4px 10px;
  background: transparent;
  border: 1px solid var(--c-line);
  color: var(--c-text-2);
  cursor: pointer;
  letter-spacing: 0.08em;
  transition: all var(--t-fast);
}
.ab-del:hover { color: var(--c-pink); border-color: var(--c-pink); }

.te-grid {
  display: grid;
  grid-template-columns: 140px 80px 110px 100px 1fr;
  gap: var(--sp-3);
  margin-bottom: var(--sp-3);
}
.te-cell { display: flex; flex-direction: column; gap: 4px; }
.te-cell label {
  font-family: var(--f-mono);
  font-size: 16px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-2);
}
.te-cell-grow { min-width: 0; }
.te-cell-full { margin-bottom: var(--sp-3); }
.te-cell-full label {
  display: block;
  font-family: var(--f-mono);
  font-size: 16px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-text-2);
  margin-bottom: 4px;
}

.te-details {
  border-top: 1px dashed var(--c-line);
  padding-top: var(--sp-3);
  margin-top: var(--sp-3);
}
.te-details summary {
  cursor: pointer;
  font-family: var(--f-mono);
  font-size: 17px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-cyan);
  padding: 6px 0;
  list-style: none;
}
.te-details summary::-webkit-details-marker { display: none; }
.te-details summary::before { content: "▸ "; transition: transform var(--t-fast); }
.te-details[open] summary::before { content: "▾ "; }

@media (max-width: 900px) {
  .te-grid { grid-template-columns: 1fr 1fr; }
}

/* ---------- 进度条 ---------- */
.prog-bar {
  position: relative;
  width: 140px;
  height: 18px;
  background: var(--c-bg-1);
  border: 1px solid var(--c-line);
  overflow: hidden;
}
.prog-fill {
  position: absolute; top: 0; left: 0; bottom: 0;
  background: linear-gradient(90deg, var(--c-cyan) 0%, var(--c-violet) 100%);
  box-shadow: 0 0 8px rgba(0, 229, 255, 0.4);
}
.prog-text {
  position: absolute; inset: 0;
  display: grid; place-items: center;
  font-family: var(--f-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-text-0);
  letter-spacing: 0.06em;
  text-shadow: 0 0 4px var(--c-bg-0);
}

/* ---------- 柱状图 ---------- */
.bar-chart {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: var(--sp-3);
  height: 200px;
  padding: var(--sp-3);
  background: var(--c-bg-1);
  border: 1px solid var(--c-line);
}
.bar-item {
  display: flex; flex-direction: column; justify-content: flex-end;
  align-items: center;
  gap: var(--sp-2);
}
.bar-fill {
  width: 100%;
  background: linear-gradient(180deg, var(--c-cyan) 0%, var(--c-violet) 100%);
  min-height: 2px;
  position: relative;
  display: grid; place-items: end center;
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.3);
  transition: height var(--t-slow);
}
.bar-val {
  position: absolute; top: -22px;
  font-family: var(--f-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-cyan);
}
.bar-date {
  font-family: var(--f-mono);
  font-size: 16px;
  color: var(--c-text-2);
  letter-spacing: 0.06em;
}

/* ---------- 登录页 ---------- */
.admin-login-body {
  min-height: 100vh;
  display: grid; place-items: center;
  padding: var(--sp-5);
  position: relative;
  overflow: hidden;
}
.login-bg {
  position: fixed; inset: 0;
  z-index: 0;
  background:
    radial-gradient(circle at 30% 20%, rgba(248, 225, 108, 0.15) 0%, transparent 40%),
    radial-gradient(circle at 70% 80%, rgba(0, 229, 255, 0.1) 0%, transparent 40%);
}
.login-card {
  position: relative; z-index: 1;
  width: 100%;
  max-width: 440px;
  padding: var(--sp-6) var(--sp-6);
  background: var(--c-bg-1);
  border: 1px solid var(--c-yellow);
  box-shadow: 0 0 40px rgba(248, 225, 108, 0.15);
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
  overflow-y: auto;
  max-height: calc(100vh - var(--sp-5) * 2);
}
.login-logo {
  width: 60px; height: 60px;
  display: grid; place-items: center;
  background: var(--c-yellow);
  color: var(--c-bg-0);
  font-family: var(--f-display);
  font-size: 32px;
  font-weight: 700;
  margin: 0 auto var(--sp-4);
  box-shadow: 0 0 16px var(--c-yellow);
}
.login-title {
  font-size: 28px;
  text-align: center;
  margin: 0 0 8px;
  color: var(--c-text-0);
}
.login-sub {
  text-align: center;
  color: var(--c-text-2);
  font-size: 19px;
  margin-bottom: var(--sp-6);
  letter-spacing: 0.06em;
}
.login-form label {
  display: block;
  font-family: var(--f-mono);
  font-size: 17px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-text-2);
  margin-bottom: 6px;
}
.login-form input {
  width: 100%;
  padding: 12px 14px;
  background: var(--c-bg-0);
  border: 1px solid var(--c-line);
  color: var(--c-text-0);
  font-family: var(--f-mono);
  font-size: 16px;
  letter-spacing: 0.08em;
  text-align: center;
}
.login-form input:focus {
  outline: none;
  border-color: var(--c-yellow);
  box-shadow: 0 0 0 1px var(--c-yellow), 0 0 12px rgba(248, 225, 108, 0.3);
}
.login-hint {
  margin-top: var(--sp-4);
  text-align: center;
  font-family: var(--f-mono);
  font-size: 17px;
  color: var(--c-text-mute);
  letter-spacing: 0.08em;
}

/* ---------- 上传 ---------- */
.upload-form .file-drop {
  padding: var(--sp-3);
  background: var(--c-bg-0);
  border: 1px dashed var(--c-line);
  text-align: center;
  min-height: 70px;
  display: flex; flex-direction: column; justify-content: center;
  align-items: center;
}
.upload-form .file-drop:hover { border-color: var(--c-yellow); background: rgba(248, 225, 108, 0.04); }