:root {
  --green-900: #1b5e20;
  --green-700: #2e7d32;
  --green-600: #388e3c;
  --green-500: #4caf50;
  --green-100: #e8f5e9;
  --green-50: #f1f8f4;
  --text: #1a1a1a;
  --muted: #5f6368;
  --border: #e0e0e0;
  --white: #ffffff;
  --heat: #ef5350;
  --osmotic: #42a5f5;
  --salt: #26a69a;
  --oxidative: #ffa726;
  --ps: #66bb6a;
  --non-ps: #90a4ae;
  --dark-bg: #0d0d0d;
  --dark-card: #1a1a1a;
  --dark-border: rgba(255,255,255,0.15);
  --dark-text: #e0e0e0;
  --dark-muted: #9e9e9e;
  --orange: #ff9800;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--white);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--green-700); }

/* ── Navbar ── */
.navbar {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--green-900);
  text-decoration: none;
}

.navbar-brand .leaf {
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: background 0.15s, color 0.15s;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--green-100);
  color: var(--green-900);
}

/* ── Main ── */
main {
  flex: 1;
  max-width: 1100px;
  width: 100%;
  margin: 0 auto;
  padding: 40px 24px 60px;
}

.view { display: none; }
.view.active { display: block; }

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--green-900);
  margin: 0 0 8px;
}

.page-subtitle {
  color: var(--muted);
  margin: 0 0 32px;
  font-size: 0.95rem;
}

/* ── Upload page ── */
.input-tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 24px;
}

.input-tab {
  padding: 12px 24px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: 0.95rem;
  color: var(--muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s, border-color 0.15s;
}

.input-tab.active {
  color: var(--green-700);
  border-bottom-color: var(--green-700);
  font-weight: 600;
}

.panel { display: none; }
.panel.active { display: block; }

.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  background: var(--green-50);
  transition: border-color 0.2s, background 0.2s;
}

.upload-zone:hover,
.upload-zone.dragover {
  border-color: var(--green-600);
  background: var(--green-100);
}

.upload-zone input { display: none; }

.upload-icon { font-size: 2.5rem; margin-bottom: 12px; }

.file-name {
  margin-top: 12px;
  color: var(--green-700);
  font-weight: 500;
  word-break: break-all;
}

.seq-textarea {
  width: 100%;
  min-height: 200px;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.85rem;
  resize: vertical;
  line-height: 1.6;
}

.seq-textarea:focus {
  outline: none;
  border-color: var(--green-600);
  box-shadow: 0 0 0 3px rgba(46, 125, 50, 0.15);
}

.seq-count {
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--muted);
}

.seq-count.warn { color: #e65100; }
.seq-count.error { color: #c62828; }

.db-link-row {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.db-link-btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: opacity 0.2s, transform 0.1s;
}

a.db-link-btn:hover {
  transform: translateY(-1px);
  opacity: 0.9;
}

.db-link-ps {
  background: var(--green-100);
  color: var(--green-900);
  border-color: rgba(46, 125, 50, 0.25);
}

.db-link-eips {
  background: #ede7f6;
  color: #4527a0;
  border-color: rgba(69, 39, 160, 0.2);
  cursor: default;
}

.external-links {
  margin: 28px 0;
  padding: 20px 24px;
  background: var(--green-50);
  border-radius: 12px;
  border: 1px solid var(--border);
}

.external-links h3 {
  margin: 0 0 12px;
  font-size: 0.95rem;
  color: var(--green-900);
}

.external-links ul {
  margin: 0;
  padding-left: 20px;
  line-height: 2;
}

.hint-box {
  margin-top: 16px;
  padding: 14px 18px;
  background: #fffde7;
  border-left: 4px solid #f9a825;
  border-radius: 0 8px 8px 0;
  font-size: 0.85rem;
  color: #5d4037;
  line-height: 1.7;
}

.actions {
  margin-top: 28px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.btn {
  border: none;
  border-radius: 10px;
  padding: 13px 28px;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s, opacity 0.2s, transform 0.1s;
}

.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.btn-primary {
  background: var(--green-700);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--green-900);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--white);
  color: var(--green-700);
  border: 1.5px solid var(--green-700);
}

.btn-secondary:hover:not(:disabled) { background: var(--green-50); }

.btn-lg { padding: 15px 40px; font-size: 1.05rem; }

/* ── Loading page ── */
.loading-container {
  text-align: center;
  padding: 80px 24px;
  background: var(--white);
}

.loading-spinner {
  width: 64px;
  height: 64px;
  border: 5px solid var(--green-100);
  border-top-color: var(--green-700);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
  margin: 0 auto 32px;
}

@keyframes spin { to { transform: rotate(360deg); } }

.loading-title {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--green-900);
  margin-bottom: 12px;
}

.loading-desc {
  color: var(--muted);
  max-width: 480px;
  margin: 0 auto 24px;
  line-height: 1.7;
}

.progress-bar-wrap {
  max-width: 400px;
  margin: 24px auto 0;
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--green-600);
  border-radius: 3px;
  animation: progress 120s ease-out forwards;
  width: 0%;
}

@keyframes progress {
  0%   { width: 5%; }
  20%  { width: 25%; }
  50%  { width: 55%; }
  80%  { width: 80%; }
  100% { width: 92%; }
}

body.results-mode,
body.loading-mode {
  background: var(--dark-bg);
  color: var(--dark-text);
}

body.results-mode .navbar,
body.loading-mode .navbar {
  background: var(--dark-bg);
  border-bottom-color: var(--dark-border);
}

body.results-mode .navbar-brand,
body.loading-mode .navbar-brand {
  color: var(--green-500);
}

body.results-mode .nav-links a,
body.loading-mode .nav-links a {
  color: var(--dark-muted);
}

body.results-mode .nav-links a:hover,
body.results-mode .nav-links a.active,
body.loading-mode .nav-links a:hover,
body.loading-mode .nav-links a.active {
  background: rgba(76, 175, 80, 0.18);
  color: var(--green-500);
}

body.results-mode footer,
body.loading-mode footer {
  background: #000;
}

body.results-mode main,
body.loading-mode main {
  max-width: 1200px;
}

/* ── Loading page (dark) ── */
body.loading-mode .loading-container {
  background: transparent;
}

body.loading-mode .loading-title { color: var(--dark-text); }
body.loading-mode .loading-desc { color: var(--dark-muted); }
body.loading-mode .loading-spinner {
  border-color: rgba(255,255,255,0.1);
  border-top-color: var(--green-500);
}
body.loading-mode .progress-bar-wrap { background: rgba(255,255,255,0.1); }

/* ── Results page (dark card) ── */
.results-card {
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  border-radius: 16px;
  padding: 28px 32px 32px;
}

.results-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 12px;
}

.results-title {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--dark-text);
}

.btn-download-sm {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--green-700);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  transition: background 0.2s;
}

.btn-download-sm:hover { background: var(--green-500); }

.section-label {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--dark-text);
}

.results-note {
  margin: 0 0 14px;
  font-size: 0.82rem;
  color: var(--dark-muted);
}

body.results-mode .summary-cards {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  margin-bottom: 28px;
}

body.results-mode .summary-card {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  padding: 18px 16px;
  text-align: center;
}

body.results-mode .summary-card .val {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.2;
}

body.results-mode .summary-card .lbl {
  font-size: 0.78rem;
  color: var(--dark-muted);
  margin-top: 6px;
}

body.results-mode .summary-card.card-white .val { color: #fff; }
body.results-mode .summary-card.card-green .val { color: var(--green-500); }
body.results-mode .summary-card.card-orange .val { color: var(--orange); }

body.results-mode .table-wrap {
  border: 1px solid var(--dark-border);
  border-radius: 10px;
  margin-bottom: 24px;
  background: rgba(0,0,0,0.3);
}

body.results-mode .results-table th {
  background: rgba(255,255,255,0.06);
  color: var(--dark-muted);
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: lowercase;
  border-bottom: 1px solid var(--dark-border);
}

body.results-mode .results-table td {
  color: var(--dark-text);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 0.82rem;
}

body.results-mode .results-table tr:nth-child(even) td { background: rgba(255,255,255,0.02); }
body.results-mode .results-table tr:hover td { background: rgba(76,175,80,0.06); }

body.results-mode .badge {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.76rem;
  font-weight: 600;
  white-space: nowrap;
}

body.results-mode .badge-ps { background: rgba(102,187,106,0.2); color: var(--ps); }
body.results-mode .badge-non-ps { background: rgba(144,164,174,0.2); color: var(--non-ps); }
body.results-mode .badge-likely { background: rgba(102,187,106,0.25); color: #81c784; }
body.results-mode .badge-possible { background: rgba(255,152,0,0.25); color: #ffb74d; }
body.results-mode .badge-unlikely { background: rgba(144,164,174,0.2); color: #b0bec5; }
body.results-mode .badge-heat { background: rgba(239,83,80,0.25); color: #ef9a9a; }
body.results-mode .badge-osmotic { background: rgba(66,165,245,0.2); color: #90caf9; }
body.results-mode .badge-salt { background: rgba(38,166,154,0.25); color: #80cbc4; }
body.results-mode .badge-oxidative { background: rgba(255,167,38,0.25); color: #ffcc80; }
body.results-mode .badge-constitutive { background: rgba(66,165,245,0.15); color: #90caf9; }
body.results-mode .badge-induced { background: rgba(239,83,80,0.15); color: #ef9a9a; }
body.results-mode .badge-mixed { background: rgba(186,104,200,0.2); color: #ce93d8; }

.download-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 8px;
}

.download-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--dark-border);
  border-radius: 12px;
  color: var(--dark-text);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  transition: background 0.2s, border-color 0.2s;
  text-align: center;
}

.download-btn:hover {
  background: rgba(76,175,80,0.12);
  border-color: var(--green-600);
  color: var(--green-500);
}

.results-footer-actions {
  margin-top: 20px;
  text-align: center;
}

.btn-link {
  background: none;
  border: none;
  color: var(--dark-muted);
  cursor: pointer;
  font-size: 0.88rem;
  text-decoration: underline;
  padding: 4px 8px;
}

.btn-link:hover { color: var(--green-500); }

@media (max-width: 768px) {
  body.results-mode .summary-cards { grid-template-columns: repeat(2, 1fr); }
  .download-bar { grid-template-columns: 1fr; }
  .results-card { padding: 20px 16px; }
}

/* ── Results page (legacy light - kept for reference) ── */
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 12px;
  margin-bottom: 28px;
}

.summary-card {
  background: var(--green-50);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  text-align: center;
}

.summary-card .val {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--green-700);
}

.summary-card .lbl {
  font-size: 0.78rem;
  color: var(--muted);
  margin-top: 4px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 24px;
}

.results-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  white-space: nowrap;
}

.results-table th {
  background: var(--green-900);
  color: #fff;
  padding: 10px 12px;
  text-align: left;
  font-weight: 600;
  position: sticky;
  top: 0;
}

.results-table td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
}

.results-table tr:nth-child(even) td { background: #fafafa; }
.results-table tr:hover td { background: var(--green-50); }

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge-ps { background: #e8f5e9; color: var(--ps); }
.badge-non-ps { background: #eceff1; color: var(--non-ps); }
.badge-likely { background: #e8f5e9; color: #2e7d32; }
.badge-possible { background: #fff3e0; color: #ef6c00; }
.badge-unlikely { background: #eceff1; color: #607d8b; }
.badge-heat { background: #ffebee; color: var(--heat); }
.badge-osmotic { background: #f3e5f5; color: var(--osmotic); }
.badge-salt { background: #e8f5e9; color: var(--salt); }
.badge-oxidative { background: #fff3e0; color: var(--oxidative); }
.badge-constitutive { background: #e3f2fd; color: #1565c0; }
.badge-induced { background: #fce4ec; color: #c2185b; }
.badge-mixed { background: #f3e5f5; color: #6a1b9a; }

/* ── Definitions page ── */
.def-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.def-table th,
.def-table td {
  padding: 12px 16px;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

.def-table th {
  background: var(--green-50);
  color: var(--green-900);
  width: 200px;
  font-weight: 600;
}

.def-table tr:nth-child(even) td { background: #fafafa; }

/* ── Contact page ── */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.contact-card {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  background: var(--green-50);
}

.contact-card h3 {
  margin: 0 0 12px;
  color: var(--green-900);
}

.contact-card p {
  margin: 6px 0;
  font-size: 0.9rem;
  line-height: 1.7;
}

.notice-box {
  padding: 20px 24px;
  background: #f5f5f5;
  border-radius: 12px;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--muted);
}

.notice-box a { word-break: break-all; }

/* ── Alert ── */
.alert {
  padding: 14px 18px;
  border-radius: 10px;
  margin-top: 20px;
  font-size: 0.9rem;
  display: none;
}

.alert.show { display: block; }
.alert-info { background: #e3f2fd; color: #1565c0; border: 1px solid #90caf9; }
.alert-error { background: #ffebee; color: #c62828; border: 1px solid #ef9a9a; }
.alert-success { background: #e8f5e9; color: #2e7d32; border: 1px solid #a5d6a7; }

/* ── Footer ── */
footer {
  background: var(--green-900);
  color: rgba(255,255,255,0.85);
  text-align: center;
  padding: 20px 24px;
  font-size: 0.82rem;
  line-height: 1.6;
}

footer a { color: #a5d6a7; }

/* ── Responsive ── */
@media (max-width: 640px) {
  .navbar { padding: 0 16px; }
  .nav-links a { padding: 6px 10px; font-size: 0.85rem; }
  main { padding: 24px 16px 40px; }
}