/* 课后延期服务系统 - 第一版原型 通用样式 */
:root {
  --bg: #f0f4f8;
  --surface: #ffffff;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --sidebar: #0f172a;
  --sidebar-text: #94a3b8;
  --success: #059669;
  --warning: #d97706;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.5;
}

a {
  color: var(--primary);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

/* 入口页 */
.landing {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 24px;
  background: linear-gradient(160deg, #e0e7ff 0%, var(--bg) 45%, #f8fafc 100%);
}

.landing h1 {
  margin: 0 0 12px;
  font-size: 1.75rem;
  font-weight: 700;
  color: #0f172a;
  text-align: center;
}

.landing .sub {
  max-width: 560px;
  text-align: center;
  color: var(--muted);
  margin-bottom: 40px;
}

.role-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  max-width: 960px;
  width: 100%;
}

.role-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  transition: transform 0.2s, box-shadow 0.2s;
}

.role-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.1);
}

.role-card h2 {
  margin: 0 0 8px;
  font-size: 1.1rem;
  color: #0f172a;
}

.role-card p {
  margin: 0 0 16px;
  font-size: 13px;
  color: var(--muted);
}

.role-card ul {
  margin: 0 0 16px;
  padding-left: 18px;
  font-size: 12px;
  color: var(--muted);
}

.role-card .btn {
  display: inline-block;
  width: 100%;
  text-align: center;
  padding: 10px 16px;
  background: var(--primary);
  color: #fff !important;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none !important;
  border: none;
  cursor: pointer;
  font-size: 14px;
}

.role-card .btn:hover {
  background: var(--primary-hover);
}

.role-card .btn--ghost {
  background: #fff;
  color: var(--primary) !important;
  border: 1px solid var(--primary);
  margin-top: 8px;
}

.role-card .tag {
  display: inline-block;
  font-size: 11px;
  padding: 2px 8px;
  background: #e0e7ff;
  color: var(--primary);
  border-radius: 4px;
  margin-bottom: 8px;
}

/* 应用壳：侧栏 + 主区 */
.app {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 220px;
  background: var(--sidebar);
  color: #fff;
  flex-shrink: 0;
  padding: 20px 0;
}

.sidebar .brand {
  padding: 0 20px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 12px;
}

.sidebar .brand strong {
  display: block;
  font-size: 15px;
}

.sidebar .brand small {
  color: var(--sidebar-text);
  font-size: 11px;
}

.sidebar nav a {
  display: block;
  padding: 10px 20px;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 13px;
  border-left: 3px solid transparent;
}

.sidebar nav a:hover,
.sidebar nav a.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
  border-left-color: var(--primary);
}

.sidebar .back {
  margin-top: 24px;
  padding: 0 20px;
}

.sidebar .back a {
  color: var(--sidebar-text);
  font-size: 12px;
}

.main {
  flex: 1;
  padding: 24px 32px;
  overflow-x: auto;
}

.main header {
  margin-bottom: 24px;
}

.main header h1 {
  margin: 0 0 6px;
  font-size: 1.35rem;
  font-weight: 600;
}

.main header .desc {
  color: var(--muted);
  font-size: 13px;
}

/* 区块 */
.panel {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 20px;
  overflow: hidden;
}

.panel-hd {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-bd {
  padding: 18px;
}

/* 表格 */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th,
td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: #f8fafc;
  font-weight: 600;
  color: #475569;
}

tr:hover td {
  background: #fafbfc;
}

/* 表单行 */
.form-row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 12px 16px;
  align-items: center;
  margin-bottom: 12px;
  max-width: 560px;
}

.form-row label {
  color: var(--muted);
  font-size: 13px;
}

input[type="text"],
input[type="number"],
input[type="datetime-local"],
select,
textarea {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 100%;
  font-size: 13px;
}

textarea {
  min-height: 72px;
  resize: vertical;
}

input[type="date"],
input[type="time"],
input[type="month"],
input[type="tel"],
input[type="email"] {
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 100%;
  font-size: 13px;
}

input[type="file"] {
  font-size: 13px;
}

input[type="checkbox"],
input[type="radio"] {
  width: auto;
  margin-right: 6px;
}

.req {
  color: #dc2626;
  margin-left: 2px;
}

.form-hint {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.form-actions {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.form-grid-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 28px;
  max-width: 920px;
}

.form-grid-2col .form-row {
  max-width: none;
}

.form-fieldset {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 18px 8px;
  margin-bottom: 16px;
  background: #fafbfc;
}

.form-fieldset legend {
  font-weight: 600;
  font-size: 13px;
  color: #334155;
  padding: 0 6px;
}

.form-row--wide {
  max-width: 720px;
}

.form-row--stack {
  display: block;
  margin-bottom: 14px;
}

.form-row--stack label,
.label-like {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
}

.label-like {
  font-weight: 600;
  color: var(--text);
}

.checkbox-row,
.radio-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
}

.checkbox-row label,
.radio-row label {
  display: inline-flex;
  align-items: center;
  color: var(--text);
  font-weight: normal;
  cursor: pointer;
}

.inline-inputs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.inline-inputs input,
.inline-inputs select {
  flex: 1;
  min-width: 120px;
}

.btn-sm {
  display: inline-block;
  padding: 6px 12px;
  font-size: 12px;
  border-radius: 6px;
  background: var(--primary);
  color: #fff !important;
  border: none;
  cursor: pointer;
  text-decoration: none !important;
}

.btn-sm.btn--line {
  background: #fff;
  color: var(--primary) !important;
  border: 1px solid var(--border);
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 500;
}

.badge--ok {
  background: #d1fae5;
  color: var(--success);
}

.badge--wait {
  background: #fef3c7;
  color: var(--warning);
}

.badge--muted {
  background: #f1f5f9;
  color: var(--muted);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

@media (max-width: 900px) {
  .app {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
  }
  .grid-2 {
    grid-template-columns: 1fr;
  }
  .form-grid-2col {
    grid-template-columns: 1fr;
  }
}

.hidden {
  display: none !important;
}

/* 弹窗 */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
  box-sizing: border-box;
}

.modal.is-open {
  display: flex;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  cursor: pointer;
}

.modal-dialog {
  position: relative;
  z-index: 1;
  background: var(--surface);
  border-radius: 12px;
  width: 100%;
  max-width: 760px;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.35);
  border: 1px solid var(--border);
}

.modal-dialog--wide {
  max-width: 900px;
}

.modal-hd {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
  font-size: 15px;
}

.modal-hd .modal-title {
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
  color: var(--muted);
  padding: 4px 8px;
  border-radius: 6px;
}

.modal-close:hover {
  background: #f1f5f9;
  color: var(--text);
}

.modal-bd {
  padding: 16px 18px;
  overflow-y: auto;
  flex: 1;
}

.modal-ft {
  flex-shrink: 0;
  padding: 12px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  background: #fafbfc;
}

.modal-bd .form-grid-2col {
  max-width: none;
}

.modal-bd .form-row {
  max-width: none;
}