:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --ink: #152033;
  --muted: #66758a;
  --line: #dce4ef;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --good: #0f9f6e;
  --warn: #d97706;
  --danger: #dc2626;
  --physics: #0ea5e9;
  --chemistry: #14b8a6;
  --biology: #65a30d;
  --shadow: 0 16px 40px rgba(36, 54, 90, 0.1);
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--ink);
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

.study-app {
  min-height: 100vh;
}

.login-shell {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(340px, 440px);
  min-height: 100vh;
}

.login-stage {
  position: relative;
  display: flex;
  align-items: flex-end;
  padding: 56px;
  overflow: hidden;
  background:
    linear-gradient(125deg, rgba(12, 44, 78, 0.92), rgba(37, 99, 235, 0.78)),
    radial-gradient(circle at 20% 18%, rgba(255, 255, 255, 0.28), transparent 34%),
    linear-gradient(45deg, #0f172a, #0284c7);
}

.login-stage::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.12) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent);
}

.login-copy {
  position: relative;
  max-width: 720px;
  color: #fff;
}

.login-copy p {
  margin: 0;
  color: rgba(255, 255, 255, 0.78);
  font-size: 18px;
  line-height: 1.8;
}

.login-copy h1 {
  margin: 12px 0 18px;
  max-width: 680px;
  font-size: 58px;
  line-height: 1.05;
  letter-spacing: 0;
}

.login-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 24px;
  padding: 48px;
  background: var(--panel);
}

.login-panel h2 {
  margin: 0;
  font-size: 30px;
}

.login-panel form,
.config-grid,
.score-form {
  display: grid;
  gap: 14px;
}

.register-block {
  display: grid;
  gap: 14px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.register-block h3 {
  margin: 0 0 6px;
  font-size: 20px;
}

.register-form {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.register-form button {
  grid-column: 1 / -1;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  background: #fff;
  color: var(--ink);
  outline: none;
}

.field textarea {
  min-height: 86px;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.primary-btn,
.secondary-btn,
.ghost-btn,
.danger-btn {
  min-height: 40px;
  border-radius: 8px;
  padding: 0 16px;
  font-weight: 800;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.primary-btn {
  background: var(--accent);
  color: #fff;
}

.primary-btn:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.secondary-btn {
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
}

.ghost-btn {
  background: transparent;
  color: var(--accent);
}

.danger-btn {
  background: #fef2f2;
  color: var(--danger);
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
}

.app-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 24px 18px;
  border-right: 1px solid var(--line);
  background: #f8fbff;
  color: var(--ink);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 6px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-weight: 900;
}

.brand strong,
.user-box strong {
  display: block;
}

.brand small,
.user-box small {
  color: var(--muted);
}

.nav {
  display: grid;
  gap: 6px;
}

.nav button {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  border-radius: 8px;
  padding: 0 12px;
  background: transparent;
  color: var(--muted);
  text-align: left;
  font-weight: 700;
}

.nav button.active,
.nav button:hover {
  background: #eaf2ff;
  color: var(--accent);
}

.user-box {
  margin-top: auto;
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.main {
  min-width: 0;
  padding: 28px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
}

.topbar h1 {
  margin: 0 0 8px;
  font-size: 30px;
}

.topbar p {
  margin: 0;
  color: var(--muted);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(340px, 0.85fr);
  gap: 18px;
}

.panel {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 20px 0;
}

.panel-header h2,
.panel-header h3 {
  margin: 0;
}

.panel-header p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.panel-body {
  padding: 18px 20px 20px;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metric {
  border-left: 3px solid var(--accent);
  padding: 8px 12px;
  background: var(--panel-soft);
  border-radius: 8px;
}

.metric span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.metric strong {
  display: block;
  margin-top: 6px;
  font-size: 26px;
}

.subject-bars {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.subject-bar {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 74px;
  align-items: center;
  gap: 12px;
}

.subject-name {
  font-weight: 800;
}

.bar-track {
  position: relative;
  height: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: #e7edf5;
}

.bar-fill {
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
}

.subject-score {
  color: var(--muted);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.subject-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.subject-card {
  display: grid;
  gap: 14px;
  min-height: 244px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--accent);
  border-radius: 8px;
  padding: 15px;
  background: #fff;
}

.subject-card.warn {
  border-top-color: var(--warn);
}

.subject-card.danger {
  border-top-color: var(--danger);
}

.subject-card.good {
  border-top-color: var(--good);
}

.subject-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.subject-card-head strong {
  display: block;
  font-size: 20px;
}

.subject-card-head span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.subject-card-head b {
  color: var(--accent);
  font-size: 22px;
}

.subject-mini-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.subject-mini-grid div {
  border-radius: 8px;
  padding: 10px;
  background: var(--panel-soft);
}

.subject-mini-grid span,
.subject-mini-grid small {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
}

.subject-mini-grid strong {
  display: block;
  margin: 4px 0;
  font-size: 19px;
}

.subject-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.subject-action {
  color: var(--ink) !important;
  font-weight: 700;
}

.analysis-list,
.review-list,
.report-list,
.checkin-list,
.course-list {
  display: grid;
  gap: 12px;
}

.analysis-item,
.review-item,
.report-item,
.checkin-item,
.course-item,
.plan-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fff;
}

.analysis-item strong,
.review-item strong,
.report-item strong,
.course-item strong,
.plan-item strong {
  display: block;
  margin-bottom: 6px;
}

.analysis-item p,
.review-item p,
.report-item p,
.course-item p,
.plan-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.65;
}

.plan-board {
  display: grid;
  gap: 12px;
}

.plan-item {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr) auto;
  gap: 14px;
  align-items: center;
}

.plan-date {
  font-weight: 900;
  color: var(--accent);
}

.task-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  border-radius: 999px;
  padding: 0 9px;
  background: #eef4ff;
  color: #1e40af;
  font-size: 12px;
  font-weight: 800;
}

.tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.tabs button {
  min-height: 36px;
  border-radius: 999px;
  padding: 0 14px;
  background: #e8eef7;
  color: var(--muted);
  font-weight: 800;
}

.tabs button.active {
  background: var(--ink);
  color: #fff;
}

.two-col {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 18px;
}

.score-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.image-dropzone {
  position: relative;
  display: grid;
  place-items: center;
  gap: 8px;
  min-height: 150px;
  margin-bottom: 16px;
  border: 1.5px dashed #9db7df;
  border-radius: 8px;
  padding: 18px;
  background: #f4f8ff;
  text-align: center;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.image-dropzone.is-dragging {
  border-color: var(--accent);
  background: #eaf2ff;
  transform: translateY(-1px);
}

.image-dropzone input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.image-dropzone strong {
  font-size: 18px;
}

.image-dropzone p {
  max-width: 460px;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.image-preview-grid {
  display: grid;
  gap: 10px;
  margin-bottom: 16px;
}

.image-preview-item {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  background: #fff;
}

.image-preview-item img {
  width: 84px;
  height: 64px;
  object-fit: cover;
  border-radius: 6px;
  background: var(--panel-soft);
}

.image-preview-item strong {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.image-preview-item p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.image-error {
  color: var(--danger) !important;
}

.score-table th,
.score-table td {
  border-bottom: 1px solid var(--line);
  padding: 11px 8px;
  text-align: left;
  white-space: nowrap;
}

.score-table th {
  color: var(--muted);
  font-size: 12px;
}

.score-table td:last-child,
.score-table th:last-child {
  text-align: right;
}

.config-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.config-grid .wide {
  grid-column: 1 / -1;
}

.video-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
}

.video-stage {
  min-height: 360px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(15, 23, 42, 0.94), rgba(30, 64, 175, 0.82)),
    repeating-linear-gradient(90deg, transparent 0 28px, rgba(255, 255, 255, 0.06) 28px 29px);
  color: #fff;
  display: grid;
  place-items: center;
  padding: 32px;
  text-align: center;
}

.video-stage h2 {
  margin: 0 0 10px;
  font-size: 34px;
}

.video-stage p {
  margin: 0 auto 20px;
  max-width: 560px;
  color: rgba(255, 255, 255, 0.76);
  line-height: 1.8;
}

.checkin-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.status-pill {
  border-radius: 999px;
  padding: 5px 9px;
  background: #ecfdf5;
  color: var(--good);
  font-size: 12px;
  font-weight: 900;
}

.status-pill.warn {
  background: #fff7ed;
  color: var(--warn);
}

.empty {
  padding: 22px;
  color: var(--muted);
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
}

.admin-only {
  display: none;
}

.is-admin .admin-only {
  display: block;
}

@media (max-width: 1080px) {
  .login-shell,
  .app-shell,
  .dashboard-grid,
  .two-col,
  .video-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
  }

  .nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .login-stage,
  .login-panel,
  .main {
    padding: 24px;
  }

  .login-copy h1 {
    font-size: 40px;
  }

  .topbar,
  .panel-header,
  .checkin-item {
    align-items: stretch;
    flex-direction: column;
  }

  .metric-row,
  .subject-card-grid,
  .config-grid {
    grid-template-columns: 1fr;
  }

  .register-form {
    grid-template-columns: 1fr;
  }

  .plan-item,
  .subject-bar {
    grid-template-columns: 1fr;
  }

  .subject-score {
    text-align: left;
  }
}