/* ============ 育欣课堂管理后台 ============ */
:root {
  --green-900: #2F4A18;
  --green-700: #4E7A1E;
  --green-600: #5E9C25;
  --green-100: #EEF2E8;
  --green-50: #F7F9F4;
  --red: #D8382F;
  --text: #26331B;
  --text-2: #5E665A;
  --text-3: #9AA295;
  --line: #E5EADF;
  --card: #ffffff;
  --bg: #F4F6F1;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(31,45,15,.06), 0 4px 16px rgba(31,45,15,.05);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  background: var(--bg); color: var(--text); font-size: 14px; line-height: 1.5;
}
.hidden { display: none !important; }
.muted { color: var(--text-3); font-size: 12.5px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: none; border-radius: 10px; padding: 10px 20px; font-size: 14px; font-weight: 500;
  cursor: pointer; transition: all .15s ease; text-decoration: none;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--green-700); color: #fff; box-shadow: 0 2px 8px rgba(78,122,30,.25); }
.btn-primary:hover { background: var(--green-900); }
.btn-ghost { background: var(--green-100); color: var(--green-700); }
.btn-ghost:hover { background: #E2E9D6; }
.btn-danger-ghost { background: #FBEAE9; color: var(--red); }
.btn-danger-ghost:hover { background: #F5D9D7; }
.btn-sm { padding: 6px 14px; font-size: 13px; border-radius: 8px; }
.btn-block { width: 100%; }
.file-btn { position: relative; overflow: hidden; }
.file-btn input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; font-size: 0; }

/* ---------- 表单 ---------- */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--text-2); margin-bottom: 6px; font-weight: 500; }
.field label em { color: var(--red); font-style: normal; }
.field input, .field select, .field textarea {
  width: 100%; padding: 10px 14px; border: 1.5px solid var(--line); border-radius: 10px;
  font-size: 14px; color: var(--text); background: #fff; outline: none;
  transition: border-color .15s, box-shadow .15s; font-family: inherit;
}
.field input:focus, .field select:focus, .field textarea:focus {
  border-color: var(--green-600); box-shadow: 0 0 0 3px rgba(94,156,37,.12);
}
.field textarea { resize: vertical; min-height: 96px; }
.msg { color: var(--red); font-size: 13px; min-height: 20px; margin-top: 10px; }

/* ---------- 登录页 ---------- */
.login-view {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(ellipse 800px 500px at 15% 10%, rgba(94,156,37,.16), transparent),
    radial-gradient(ellipse 700px 500px at 90% 90%, rgba(78,122,30,.12), transparent),
    var(--bg);
}
.login-wrap { width: 400px; max-width: calc(100vw - 32px); }
.login-brand { text-align: center; margin-bottom: 28px; }
.brand-mark {
  width: 64px; height: 64px; margin: 0 auto 14px; border-radius: 18px;
  background: linear-gradient(135deg, var(--green-600), var(--green-700));
  color: #fff; font-size: 30px; font-weight: 700; display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(78,122,30,.35);
}
.brand-mark.sm { width: 40px; height: 40px; font-size: 19px; border-radius: 12px; margin: 0; box-shadow: none; }
.login-brand h1 { font-size: 24px; letter-spacing: 2px; }
.login-brand p { color: var(--text-3); font-size: 13px; margin-top: 4px; }
.login-card { background: var(--card); border-radius: 16px; padding: 30px 28px 22px; box-shadow: var(--shadow); }
.login-card .btn { margin-top: 6px; }
.login-foot { text-align: center; color: var(--text-3); font-size: 12px; margin-top: 20px; }

/* ---------- 主框架 ---------- */
#view-main { display: flex; min-height: 100vh; }
.sidebar {
  width: 232px; flex-shrink: 0; background: var(--card); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh;
}
.side-brand { display: flex; align-items: center; gap: 12px; padding: 22px 20px 20px; border-bottom: 1px solid var(--line); }
.sb-title { font-weight: 700; font-size: 16px; }
.sb-sub { font-size: 12px; color: var(--text-3); }
.side-nav { padding: 14px 12px; display: flex; flex-direction: column; gap: 4px; flex: 1; }
.nav-item {
  display: flex; align-items: center; gap: 10px; padding: 11px 14px; border: none; background: none;
  border-radius: 10px; font-size: 14px; color: var(--text-2); cursor: pointer; transition: all .12s;
  font-family: inherit; text-align: left;
}
.nav-item svg { width: 18px; height: 18px; flex-shrink: 0; }
.nav-item:hover { background: var(--green-50); color: var(--green-700); }
.nav-item.on { background: var(--green-700); color: #fff; box-shadow: 0 2px 8px rgba(78,122,30,.28); }
.side-foot { padding: 16px; border-top: 1px solid var(--line); }
.who { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.avatar {
  width: 36px; height: 36px; border-radius: 10px; background: var(--green-100);
  color: var(--green-700); font-weight: 700; display: flex; align-items: center; justify-content: center;
}
.who-name { font-weight: 600; font-size: 14px; }
.who-role { font-size: 12px; color: var(--text-3); }

.main { flex: 1; padding: 28px 32px 60px; max-width: 1160px; }

/* ---------- 页头 ---------- */
.page-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 22px; }
.page-head h2 { font-size: 20px; font-weight: 700; }
.page-sub { color: var(--text-3); font-size: 13px; margin-top: 4px; }

/* ---------- 统计条 ---------- */
.stat-row { display: flex; gap: 12px; margin-bottom: 18px; }
.stat {
  background: var(--card); border-radius: var(--radius); padding: 12px 18px;
  box-shadow: var(--shadow); font-size: 13px; color: var(--text-2);
  display: flex; align-items: center; gap: 8px;
}
.stat b { font-size: 18px; color: var(--text); }

/* ---------- 素材网格 ---------- */
.progress { height: 5px; background: var(--green-100); border-radius: 3px; overflow: hidden; margin-bottom: 14px; }
#mat-bar { height: 100%; width: 0; background: linear-gradient(90deg, var(--green-600), var(--green-700)); transition: width .25s; }
.mat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 16px; }
.mat-card {
  background: var(--card); border-radius: var(--radius); overflow: hidden;
  box-shadow: var(--shadow); transition: transform .15s, box-shadow .15s;
}
.mat-card:hover { transform: translateY(-2px); box-shadow: 0 4px 8px rgba(31,45,15,.08), 0 8px 24px rgba(31,45,15,.08); }
.mat-media { position: relative; height: 140px; background: var(--green-50); }
.mat-media img, .mat-media video { width: 100%; height: 100%; object-fit: cover; display: block; }
.mat-badge {
  position: absolute; top: 8px; left: 8px; font-size: 11px; padding: 3px 9px; border-radius: 10px;
  background: rgba(38,51,27,.72); color: #fff; backdrop-filter: blur(4px);
}
.mat-body { padding: 11px 13px 13px; }
.mat-name { font-size: 13.5px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mat-meta { font-size: 12px; color: var(--text-3); margin: 3px 0 9px; }
.slot-chips { display: flex; flex-wrap: wrap; gap: 5px; }
.chip {
  font-size: 11.5px; padding: 3px 10px; border-radius: 10px; background: var(--green-50);
  color: var(--text-2); cursor: pointer; user-select: none; border: 1px solid var(--line); transition: all .12s;
}
.chip:hover { border-color: var(--green-600); color: var(--green-700); }
.chip.on { background: var(--green-700); color: #fff; border-color: var(--green-700); }
.mat-del {
  margin-top: 9px; font-size: 12px; color: var(--red); cursor: pointer; display: inline-block; opacity: .75;
}
.mat-del:hover { opacity: 1; text-decoration: underline; }

/* ---------- 课程列表 ---------- */
.course-list { display: flex; flex-direction: column; gap: 14px; }
.course-item {
  display: flex; align-items: center; gap: 16px; background: var(--card);
  border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow);
  transition: transform .15s, box-shadow .15s;
}
.course-item:hover { transform: translateY(-1px); box-shadow: 0 4px 8px rgba(31,45,15,.08), 0 8px 24px rgba(31,45,15,.08); }
.course-cover {
  width: 132px; height: 88px; border-radius: 10px; object-fit: cover; flex-shrink: 0;
  background: linear-gradient(135deg, var(--green-600), var(--green-700));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 22px; font-weight: 700; overflow: hidden;
}
.course-cover img { width: 100%; height: 100%; object-fit: cover; }
.course-info { flex: 1; min-width: 0; }
.course-title { font-size: 15px; font-weight: 600; }
.course-meta { font-size: 12.5px; color: var(--text-3); margin-top: 4px; display: flex; flex-wrap: wrap; gap: 4px 14px; }
.course-meta .tag { background: var(--green-50); color: var(--green-700); padding: 1px 8px; border-radius: 9px; font-size: 11.5px; }
.course-price { color: var(--red); font-weight: 700; font-size: 16px; margin-top: 5px; }
.course-price small { font-size: 12px; font-weight: 400; color: var(--text-3); }
.course-ops { display: flex; flex-direction: column; gap: 8px; flex-shrink: 0; }

/* ---------- 卡片 / 空态 ---------- */
.card { background: var(--card); border-radius: 16px; padding: 26px; box-shadow: var(--shadow); }
.card-form { max-width: 400px; }
.empty { text-align: center; padding: 70px 0; color: var(--text-2); }
.empty-ico { font-size: 44px; margin-bottom: 12px; opacity: .8; }
.empty p { font-size: 15px; font-weight: 500; }
.empty .muted { margin-top: 4px; }

/* ---------- 弹层 ---------- */
.modal {
  position: fixed; inset: 0; background: rgba(28,38,20,.5); backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center; z-index: 50; padding: 20px;
}
.modal-card {
  background: #fff; border-radius: 18px; padding: 26px 28px 22px; width: 680px;
  max-width: 100%; max-height: 90vh; overflow-y: auto; box-shadow: 0 20px 60px rgba(20,30,10,.3);
}
.modal-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
.modal-head h3 { font-size: 17px; }
.modal-close {
  border: none; background: var(--green-50); color: var(--text-2); width: 32px; height: 32px;
  border-radius: 9px; cursor: pointer; font-size: 14px; transition: all .12s;
}
.modal-close:hover { background: var(--green-100); color: var(--text); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; }
.grid2 .field.col2 { grid-column: span 2; }

.cover-row { display: flex; align-items: flex-start; gap: 16px; }
.cover-box {
  width: 168px; height: 100px; border-radius: 10px; overflow: hidden; flex-shrink: 0;
  border: 1.5px dashed var(--line); background: var(--green-50);
  display: flex; align-items: center; justify-content: center; cursor: pointer; transition: border-color .15s;
}
.cover-box:hover { border-color: var(--green-600); }
.cover-box img { width: 100%; height: 100%; object-fit: cover; }
.cover-empty { display: flex; flex-direction: column; align-items: center; color: var(--text-3); font-size: 12px; gap: 2px; }
.cover-empty span:first-child { font-size: 22px; line-height: 1; }
.cover-side { display: flex; flex-direction: column; gap: 6px; align-items: flex-start; }
.modal-ops { display: flex; justify-content: flex-end; gap: 12px; margin-top: 14px; padding-top: 16px; border-top: 1px solid var(--line); }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  #view-main { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; flex-direction: row; align-items: center; flex-wrap: wrap; }
  .side-brand { border-bottom: none; padding: 14px 16px; }
  .side-nav { flex-direction: row; padding: 8px; flex: 1; }
  .side-foot { border-top: none; padding: 8px 12px; display: flex; align-items: center; gap: 12px; }
  .who { margin-bottom: 0; }
  .main { padding: 20px 16px 50px; }
  .grid2 { grid-template-columns: 1fr; }
  .grid2 .field.col2 { grid-column: span 1; }
}