:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fc;
  --surface: #ffffff;
  --surface-elev: #ffffff;
  --text-strong: #0f1728;
  --text: #1f2a44;
  --text-dim: #5f6f8f;
  --line: #dbe3f0;
  --line-soft: #e9eef7;
  --accent: #2f6bff;
  --accent-2: #2bb7a6;
  --up: #149b63;
  --down: #e14d5d;
  --shadow: 0 4px 14px rgba(16, 24, 40, 0.06);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  color: var(--text);
  font-family: Inter, "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  min-height: 100vh;
  line-height: 1.6;
  letter-spacing: 0.1px;
}

.app-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 6% 0%, rgba(47, 107, 255, 0.08), transparent 22%),
    radial-gradient(circle at 95% 0%, rgba(43, 183, 166, 0.06), transparent 20%),
    #ffffff;
}

.container {
  width: min(1280px, 92vw);
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
}

.brand {
  display: flex;
  align-items: center;
}

.brand-logo {
  width: 248px;
  max-width: 42vw;
  height: auto;
  display: block;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: var(--text-strong);
}

.nav-links a.active {
  color: var(--text-strong);
  border-bottom: 2px solid var(--accent);
  padding-bottom: 5px;
}

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

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.page-main {
  display: grid;
  gap: 16px;
  padding: 14px 0 8px;
}

.hero {
  padding: 24px;
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 18px;
}

.badge {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid #b9cdfd;
  background: #eef4ff;
  color: #2b4e9f;
  font-size: 12px;
}

.hero h1 {
  margin: 12px 0 10px;
  color: var(--text-strong);
  font-size: clamp(30px, 4vw, 44px);
  line-height: 1.15;
  letter-spacing: 0.2px;
}

.hero p {
  margin: 0;
  color: var(--text);
  font-size: 15px;
  max-width: 64ch;
}

.hero-chart {
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: #fbfcff;
  padding: 16px;
}

.chart-head,
.chart-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-dim);
  font-size: 13px;
}

.feature-checklist {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.feature-checklist li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 14px;
}

.feature-checklist span {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: #eef4ff;
  border: 1px solid #bfd2ff;
  color: #2f5db7;
  font-size: 12px;
}

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

.module-card {
  padding: 18px;
}

.module-card h3 {
  margin: 0 0 8px;
  color: var(--text-strong);
  font-size: 16px;
}

.module-card p {
  margin: 0 0 12px;
  color: var(--text);
  font-size: 14px;
}

.module-link {
  color: #285de0;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}

.page-title {
  padding: 18px;
}

.page-title h1 {
  margin: 0;
  color: var(--text-strong);
  font-size: 30px;
}

.page-title p {
  margin: 10px 0 0;
  color: var(--text);
}

.page-title code {
  color: #234a9e;
  background: #edf3ff;
  border: 1px solid #c7d8fb;
  border-radius: 7px;
  padding: 2px 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 12px;
}

.news-list-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.news-index-wrap {
  padding: 8px 18px;
}

.news-index-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.news-index-list li {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 10px;
  align-items: center;
  border-bottom: 1px solid var(--line-soft);
  padding: 10px 0;
}

.news-index-list li:last-child {
  border-bottom: none;
}

.news-index-no {
  color: var(--text-dim);
  font-size: 12px;
  font-weight: 600;
}

.news-index-title {
  color: var(--text-strong);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.45;
}

.news-index-title:hover {
  color: #1d4fc9;
}

.news-index-meta {
  color: var(--text-dim);
  font-size: 12px;
  white-space: nowrap;
}

.list-card {
  padding: 16px;
}

.list-card .tag {
  display: inline-block;
  font-size: 12px;
  border-radius: 999px;
  padding: 5px 10px;
  background: #eef4ff;
  border: 1px solid #bfd2ff;
  color: #2f5db7;
}

.list-card h3 {
  margin: 10px 0 8px;
  color: var(--text-strong);
  font-size: 17px;
}

.list-card p {
  margin: 0;
  color: var(--text);
  font-size: 14px;
}

.news-brief {
  margin: 0;
}

.news-details {
  margin-top: 8px;
  font-size: 13px;
  color: var(--text);
}

.news-details summary {
  cursor: pointer;
  color: #285de0;
  user-select: none;
}

.news-details p {
  margin-top: 6px;
}

.news-meta {
  margin: 8px 0;
  color: var(--text-dim);
  font-size: 12px;
}

.panel {
  padding: 18px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.panel-head h2 {
  margin: 0;
  color: var(--text-strong);
  font-size: 18px;
}

.panel-head a {
  color: #285de0;
  text-decoration: none;
  font-size: 13px;
}

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

th,
td {
  text-align: left;
  padding: 12px 8px;
  border-bottom: 1px solid var(--line-soft);
}

th {
  color: var(--text-dim);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.45px;
}

tbody tr:hover {
  background: #f6f9ff;
}

.loading {
  text-align: center;
  color: var(--text-dim);
}

.placeholder-card {
  min-height: 300px;
  display: grid;
  place-content: center;
  text-align: center;
}

.auth-wrap {
  max-width: 520px;
  width: 100%;
  padding: 20px;
}

.auth-form {
  display: grid;
  gap: 12px;
}

.auth-form label {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
}

.auth-form input,
.community-form input,
.community-form textarea,
.chat-input-row input {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  color: var(--text-strong);
}

.auth-form input:focus,
.community-form input:focus,
.community-form textarea:focus,
.chat-input-row input:focus {
  outline: none;
  border-color: #8fb1ff;
  box-shadow: 0 0 0 3px rgba(47, 107, 255, 0.12);
}

.auth-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--text-dim);
}

.auth-row a,
.auth-tip a {
  color: #285de0;
  text-decoration: none;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: 6px;
}

.auth-tip {
  margin: 0;
  font-size: 13px;
  color: var(--text-dim);
}

.form-message {
  margin: 0;
  min-height: 20px;
  font-size: 13px;
}

.form-message.info {
  color: #2f5db7;
}

.form-message.success {
  color: var(--up);
}

.form-message.error {
  color: var(--down);
}

.community-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 12px;
}

.board-panel {
  padding: 16px;
}

.board-panel h3,
.chat-panel h3 {
  margin: 0 0 12px;
  color: var(--text-strong);
}

.community-form {
  display: grid;
  gap: 10px;
}

.community-form textarea {
  resize: vertical;
  min-height: 120px;
}

.board-list {
  display: grid;
  gap: 10px;
}

.board-item {
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  padding: 10px;
  background: #fcfdff;
}

.board-item-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.board-item p {
  margin: 0;
  color: var(--text);
  font-size: 14px;
  white-space: pre-wrap;
}

.chat-panel {
  padding: 16px;
  display: grid;
  gap: 12px;
}

.chat-list {
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  padding: 12px;
  min-height: 360px;
  max-height: 520px;
  overflow: auto;
  display: grid;
  gap: 10px;
  background: #fcfdff;
}

.chat-item {
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 8px;
}

.chat-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.chat-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-dim);
}

.chat-item p {
  margin: 4px 0 0;
  font-size: 14px;
  color: var(--text);
  word-break: break-word;
}

.chat-input-row {
  display: grid;
  grid-template-columns: 140px 1fr auto;
  gap: 10px;
}

.btn {
  border: 1px solid transparent;
  border-radius: 10px;
  font-size: 14px;
  padding: 9px 14px;
  text-decoration: none;
  color: var(--text-strong);
  background: transparent;
  cursor: pointer;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 600;
}

.btn-ghost {
  border-color: var(--line);
  background: #ffffff;
}

.active-btn {
  border-color: #9fbaf8;
  box-shadow: 0 0 0 3px rgba(47, 107, 255, 0.1);
}

.full {
  width: 100%;
}

.up {
  color: var(--up);
}

.down {
  color: var(--down);
}

.footer {
  padding: 22px 0 30px;
  color: #7383a2;
  font-size: 12px;
}

@media (max-width: 1100px) {
  .modules-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 980px) {
  .topbar {
    position: static;
  }

  .nav-links {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .brand-logo {
    width: 220px;
    max-width: 58vw;
  }

  .modules-grid,
  .news-list-grid,
  .community-grid {
    grid-template-columns: 1fr;
  }

  .news-index-list li {
    grid-template-columns: 30px 1fr;
  }

  .news-index-meta {
    grid-column: 2;
  }

  .chat-input-row {
    grid-template-columns: 1fr;
  }

  .topbar-actions {
    margin-left: auto;
  }
}