:root {
  --bg: #f5f7fb;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-strong: #ffffff;
  --line: rgba(18, 31, 53, 0.08);
  --text: #121f35;
  --muted: #6e7a90;
  --brand: #10b7de;
  --brand-deep: #0985b7;
  --brand-soft: rgba(16, 183, 222, 0.12);
  --success: #1f9d6b;
  --warn: #d89a1d;
  --review: #7d68f8;
  --shadow: 0 24px 80px rgba(11, 28, 58, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(16, 183, 222, 0.16), transparent 28%),
    radial-gradient(circle at right center, rgba(125, 104, 248, 0.1), transparent 22%),
    linear-gradient(180deg, #f8fbff 0%, #eef3fa 100%);
}

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

.app-shell {
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 28px 22px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(18px);
  border-right: 1px solid rgba(18, 31, 53, 0.06);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px;
}

.brand-mark {
  width: 18px;
  height: 18px;
  border-radius: 5px 5px 2px 2px;
  background: linear-gradient(180deg, #101a30 0%, #16bee2 100%);
  transform: rotate(45deg);
}

.brand-text {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1;
}

.brand-ed {
  color: #101a30;
}

.brand-pro {
  color: var(--brand);
}

.nav-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.nav-label {
  margin: 0 10px 6px;
  color: var(--muted);
  font-size: 0.95rem;
}

.nav-item {
  border: 0;
  background: transparent;
  color: #697388;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border-radius: 22px;
  font-weight: 700;
  font-size: 1.05rem;
  cursor: pointer;
  transition: 180ms ease;
}

.nav-item:hover,
.nav-item.active {
  color: var(--text);
  background: rgba(16, 183, 222, 0.12);
  box-shadow: inset 3px 0 0 var(--brand);
}

.nav-icon {
  width: 26px;
  text-align: center;
  font-size: 1.25rem;
}

.recharge-btn {
  margin-top: auto;
  border: 0;
  padding: 18px 20px;
  border-radius: 999px;
  color: #fff;
  font-size: 1.3rem;
  font-weight: 800;
  cursor: pointer;
  background: linear-gradient(90deg, #8c58ff 0%, #10b7de 100%);
  box-shadow: 0 18px 36px rgba(60, 91, 199, 0.22);
}

.main-content {
  padding: 36px;
}

.topbar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.user-chip {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(18, 31, 53, 0.06);
  color: #42516d;
  font-weight: 700;
}

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

.compact-input {
  min-width: 160px;
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid rgba(18, 31, 53, 0.08);
  background: rgba(255, 255, 255, 0.88);
  color: var(--text);
  outline: none;
}

.compact-input.wide {
  min-width: 280px;
}

.compact-btn {
  padding: 10px 16px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-end;
  padding: 34px;
  border-radius: 32px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0.8)),
    linear-gradient(135deg, rgba(16, 183, 222, 0.08), rgba(125, 104, 248, 0.06));
  box-shadow: var(--shadow);
  border: 1px solid rgba(255, 255, 255, 0.7);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--brand-deep);
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 720px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
}

.hero-copy {
  max-width: 700px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
}

.hero-status {
  margin: 16px 0 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(16, 183, 222, 0.1);
  color: var(--brand-deep);
  font-weight: 700;
}

.setup-status {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.hero-actions,
.form-actions,
.modal-actions,
.panel-header,
.output-header,
.student-topline,
.toggle-row,
.header-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.primary-btn,
.ghost-btn,
.text-btn,
.template-card,
.icon-btn {
  transition: 180ms ease;
}

.primary-btn,
.ghost-btn,
.text-btn,
.icon-btn {
  border: 0;
  cursor: pointer;
}

.primary-btn {
  background: linear-gradient(135deg, #08afda 0%, #1390cc 100%);
  color: #fff;
  padding: 14px 24px;
  border-radius: 16px;
  font-weight: 800;
  box-shadow: 0 18px 32px rgba(16, 183, 222, 0.25);
}

.ghost-btn {
  background: rgba(16, 183, 222, 0.1);
  color: var(--brand-deep);
  padding: 14px 22px;
  border-radius: 16px;
  font-weight: 700;
}

.text-btn {
  background: transparent;
  color: var(--brand-deep);
  font-weight: 700;
  padding: 8px 0;
}

.danger-text-btn {
  color: #b33939;
}

.icon-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(18, 31, 53, 0.06);
  color: #6f7483;
  font-size: 1.8rem;
}

.overview-grid,
.content-grid,
.template-grid,
.insight-grid,
.process-strip {
  display: grid;
  gap: 20px;
}

.overview-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 24px;
}

.stat-card,
.panel,
.modal {
  background: var(--panel);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.75);
  box-shadow: var(--shadow);
}

.stat-card {
  padding: 24px;
  border-radius: 28px;
}

.stat-card strong {
  display: block;
  margin-top: 12px;
  font-size: 1.9rem;
}

.stat-card p,
.panel-subtitle,
.student-summary,
.upload-copy,
.toggle-row p,
.field span,
.generator-form label span,
.output-body p {
  color: var(--muted);
}

.stat-kicker {
  color: var(--brand-deep);
  font-weight: 800;
}

.stat-card.accent {
  background: linear-gradient(135deg, rgba(16, 183, 222, 0.12), rgba(125, 104, 248, 0.1));
}

.content-grid {
  grid-template-columns: minmax(320px, 0.95fr) minmax(420px, 1.15fr);
  margin-top: 24px;
}

.panel {
  padding: 24px;
  border-radius: 30px;
}

.panel-title {
  margin: 0;
  font-weight: 800;
  font-size: 1.2rem;
}

.panel-subtitle {
  margin: 6px 0 0;
  line-height: 1.6;
}

.student-list {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.student-card {
  padding: 18px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  cursor: pointer;
  transition: 180ms ease;
}

.student-card.active {
  border-color: rgba(16, 183, 222, 0.25);
  box-shadow: inset 0 0 0 1px rgba(16, 183, 222, 0.12);
  transform: translateY(-2px);
}

.student-card:hover {
  border-color: rgba(16, 183, 222, 0.22);
}

.student-card h3 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}

.student-card p {
  margin: 0;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0;
}

.tag-row span,
.status-badge,
.ai-badge {
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 0.85rem;
  font-weight: 700;
}

.tag-row span {
  background: rgba(18, 31, 53, 0.06);
  color: #42516d;
}

.status-badge.ready {
  background: rgba(31, 157, 107, 0.12);
  color: var(--success);
}

.status-badge.pending {
  background: rgba(216, 154, 29, 0.14);
  color: var(--warn);
}

.status-badge.review {
  background: rgba(125, 104, 248, 0.12);
  color: var(--review);
}

.ai-badge {
  background: linear-gradient(135deg, rgba(16, 183, 222, 0.16), rgba(125, 104, 248, 0.14));
  color: #155e8d;
}

.template-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 22px;
}

.process-strip {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 20px;
}

.process-card,
.insight-card,
.quality-panel {
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.process-card {
  padding: 16px;
}

.process-card span {
  display: inline-flex;
  width: 34px;
  height: 34px;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: rgba(18, 31, 53, 0.08);
  color: #4b5b79;
  font-size: 0.82rem;
  font-weight: 800;
}

.process-card strong,
.insight-title,
.quality-title {
  display: block;
  margin-top: 12px;
  font-size: 1rem;
}

.process-card p,
.quality-copy {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.process-card.active {
  background: rgba(16, 183, 222, 0.1);
  border-color: rgba(16, 183, 222, 0.24);
}

.insight-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 20px;
}

.insight-card {
  padding: 18px;
}

.insight-card ul {
  margin: 14px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.8;
}

.template-card {
  text-align: left;
  padding: 18px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  cursor: pointer;
}

.template-card strong,
.upload-title {
  display: block;
  font-size: 1.02rem;
}

.template-card span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  line-height: 1.55;
}

.template-card.selected,
.template-card:hover {
  border-color: rgba(16, 183, 222, 0.32);
  background: rgba(16, 183, 222, 0.1);
}

.generator-form {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.dual-field {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.generator-form label,
.field {
  display: grid;
  gap: 10px;
}

.generator-form input,
.generator-form select,
.generator-form textarea,
.field input,
.field textarea {
  width: 100%;
  border: 1px solid rgba(18, 31, 53, 0.08);
  background: rgba(248, 251, 255, 0.92);
  color: var(--text);
  border-radius: 18px;
  padding: 15px 18px;
  outline: none;
}

.generator-form textarea,
.field textarea {
  resize: vertical;
  min-height: 120px;
}

.output-card,
.upload-card,
.panel-lite {
  margin-top: 22px;
  padding: 20px;
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--line);
}

.output-body {
  margin-top: 16px;
  padding: 6px 2px 0;
  line-height: 1.8;
}

.output-actions,
.quality-tags {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.ai-score,
.quality-tags span {
  padding: 8px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 800;
}

.ai-score {
  background: rgba(31, 157, 107, 0.12);
  color: var(--success);
}

.quality-panel {
  margin-top: 18px;
  padding: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.quality-tags span {
  background: rgba(18, 31, 53, 0.06);
  color: #44526c;
}

.doc-list {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.doc-item {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(18, 31, 53, 0.05);
  border: 1px solid rgba(18, 31, 53, 0.06);
  cursor: pointer;
}

.doc-item strong,
.doc-item span {
  display: block;
}

.doc-item strong {
  margin-bottom: 6px;
}

.doc-item span,
.empty-copy,
.auth-status {
  color: var(--muted);
}

.auth-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(9, 17, 32, 0.42);
  backdrop-filter: blur(10px);
  z-index: 30;
}

.auth-backdrop.hidden {
  display: none;
}

.auth-panel {
  width: min(460px, 100%);
  padding: 28px;
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
}

.auth-header h2 {
  margin: 0;
  font-size: 1.8rem;
}

.auth-header p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.auth-tabs {
  display: flex;
  gap: 10px;
  margin: 20px 0 8px;
}

.auth-tab {
  border: 0;
  border-radius: 999px;
  padding: 10px 16px;
  background: rgba(18, 31, 53, 0.06);
  color: #51607b;
  font-weight: 700;
  cursor: pointer;
}

.auth-tab.active {
  background: rgba(16, 183, 222, 0.12);
  color: var(--brand-deep);
}

.auth-form {
  display: grid;
  gap: 14px;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(8, 18, 38, 0.28);
  backdrop-filter: blur(6px);
}

.hidden {
  display: none;
}

.modal {
  width: min(760px, 100%);
  padding: 30px;
  border-radius: 32px;
  background: rgba(255, 255, 255, 0.94);
}

.modal-header h2 {
  margin: 0;
  font-size: 2rem;
}

.field {
  margin-top: 18px;
}

.field span,
.generator-form label span {
  font-weight: 700;
}

.toggle-row {
  align-items: flex-start;
  justify-content: flex-start;
  margin-top: 24px;
}

.switch {
  position: relative;
  width: 64px;
  height: 36px;
  border-radius: 999px;
  background: #d4dae7;
  flex: 0 0 auto;
}

.switch.on {
  background: var(--brand);
}

.switch-thumb {
  position: absolute;
  top: 4px;
  left: 4px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: white;
  box-shadow: 0 6px 14px rgba(8, 18, 38, 0.12);
  transition: transform 180ms ease;
}

.switch.on .switch-thumb {
  transform: translateX(28px);
}

.dropzone {
  margin-top: 18px;
  min-height: 250px;
  border-radius: 28px;
  border: 2px dashed rgba(18, 31, 53, 0.12);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(245, 249, 255, 0.9));
  display: grid;
  place-items: center;
  text-align: center;
  padding: 28px;
  cursor: pointer;
}

.dropzone.dragover {
  border-color: rgba(16, 183, 222, 0.6);
  background: rgba(16, 183, 222, 0.08);
}

.dropzone-icon {
  width: 74px;
  height: 74px;
  display: grid;
  place-items: center;
  border-radius: 24px;
  background: rgba(16, 183, 222, 0.12);
  color: #101a30;
  font-size: 2.1rem;
  margin-bottom: 10px;
}

.dropzone strong,
.dropzone span,
.dropzone small {
  display: block;
}

.dropzone span {
  margin-top: 8px;
}

.dropzone small {
  margin-top: 12px;
  color: var(--muted);
}

.upload-list {
  list-style: none;
  padding: 0;
  margin: 18px 0 0;
  display: grid;
  gap: 10px;
}

.upload-list li {
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(18, 31, 53, 0.05);
  color: #42516d;
  font-weight: 600;
}

@media (max-width: 1100px) {
  .app-shell,
  .content-grid,
  .overview-grid {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid rgba(18, 31, 53, 0.06);
  }

  .hero {
    align-items: flex-start;
    flex-direction: column;
  }

  .topbar {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .main-content {
    padding: 18px;
  }

  .sidebar {
    padding: 18px 14px;
  }

  .hero,
  .panel,
  .modal {
    padding: 20px;
    border-radius: 24px;
  }

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

  .process-strip,
  .insight-grid,
  .dual-field {
    grid-template-columns: 1fr;
  }

  .topbar-actions {
    width: 100%;
  }

  .compact-input,
  .compact-input.wide {
    width: 100%;
    min-width: 0;
  }

  .modal-actions,
  .hero-actions,
  .form-actions {
    width: 100%;
    flex-direction: column;
  }

  .primary-btn,
  .ghost-btn {
    width: 100%;
  }

  .quality-panel {
    align-items: flex-start;
    flex-direction: column;
  }
}