* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #0f0f1a;* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(20, 20, 35, 0.6);
  --bg-card-hover: rgba(30, 30, 50, 0.6);
  --bg-input: rgba(30, 30, 50, 0.4);
  --border-color: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.1);
  --text-primary: #f8fafc;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-faint: #475569;
  --header-bg: rgba(15, 15, 26, 0.8);
  --sidebar-bg: rgba(20, 20, 35, 0.6);
  --table-bg: rgba(20, 20, 35, 0.5);
  --table-header-bg: rgba(30, 30, 50, 0.6);
  --chip-bg: rgba(55, 65, 81, 0.5);
  --chip-hover: rgba(75, 85, 101, 0.6);
}

html.light-mode {
  --bg-primary: #f8fafc;
  --bg-secondary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(241, 245, 249, 0.9);
  --bg-input: rgba(241, 245, 249, 0.8);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);
  --text-primary: #1e293b;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --text-faint: #cbd5e1;
  --header-bg: rgba(255, 255, 255, 0.9);
  --sidebar-bg: rgba(241, 245, 249, 0.8);
  --table-bg: rgba(255, 255, 255, 0.7);
  --table-header-bg: rgba(241, 245, 249, 0.9);
  --chip-bg: rgba(226, 232, 240, 0.8);
  --chip-hover: rgba(203, 213, 225, 0.9);
}

body {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
  color: var(--text-secondary);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
}

html, body {
  overflow: hidden;
  height: 100vh;
}

/* Header */
.header {
  padding: 20px 32px;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.header-content {
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 0 12px;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #22d3ee 0%, #a78bfa 50%, #f472b6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Header Buttons */
.header-buttons {
  display: flex;
  gap: 8px;
}

.header-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  background: var(--bg-input);
  border: 1px solid var(--border-hover);
  border-radius: 8px;
  transition: all 0.2s ease;
  cursor: pointer;
}

.header-btn:hover {
  color: var(--text-secondary);
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
}

.header-btn svg {
  flex-shrink: 0;
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-hover);
  border-radius: 16px;
  width: 90%;
  max-width: 450px;
  max-height: 80vh;
  overflow: hidden;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.3s ease, background 0.3s ease;
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: color 0.2s;
}

.modal-close:hover {
  color: var(--text-secondary);
}

.modal-content {
  padding: 24px;
  overflow-y: auto;
  max-height: calc(80vh - 70px);
}

/* Setting Items */
.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
  border-bottom: none;
}

.setting-label {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.setting-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}

.setting-desc {
  font-size: 12px;
  color: var(--text-dim);
}

/* Toggle Switch */
.toggle {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(55, 65, 81, 0.6);
  border-radius: 26px;
  transition: all 0.3s ease;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.toggle input:checked + .toggle-slider {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.toggle input:checked + .toggle-slider:before {
  transform: translateX(22px);
}

/* Body lock when modal is open */
body.modal-open {
  overflow: hidden;
}

/* Main Layout */
.main {
  flex: 1;
  display: grid;
  grid-template-columns: 200px 1fr;
  width: 100%;
  margin: 0 auto;
}

/* Sidebar */
.sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  padding: 20px;
  overflow-y: auto;
  max-height: calc(100vh - 75px);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.tower-group {
  margin-bottom: 24px;
}

.group-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  padding-left: 4px;
}

.tower-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tower-btn {
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  background: var(--bg-input);
  color: var(--text-muted);
  transition: all 0.15s ease;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tower-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  transform: translateX(4px);
}

.tower-btn.small-active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(6, 182, 212, 0.2));
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
}

.tower-btn.medium-active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(99, 102, 241, 0.2));
  border-color: rgba(59, 130, 246, 0.4);
  color: #60a5fa;
}

.tower-btn.tall-active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(239, 68, 68, 0.2));
  border-color: rgba(245, 158, 11, 0.4);
  color: #fbbf24;
}

.tower-btn.special-active {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(236, 72, 153, 0.2));
  border-color: rgba(139, 92, 246, 0.4);
  color: #a78bfa;
}

.tower-height {
  font-size: 11px;
  color: var(--text-dim);
  font-family: monospace;
  margin-left: 8px;
  flex-shrink: 0;
}

/* Content Area */
.content {
  padding: 28px;
  overflow-y: auto;
  max-height: calc(100vh - 75px);
}

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

.header-top {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.tower-name {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tower-alt {
  font-size: 1rem;
  color: var(--text-dim);
}

.meta-tag {
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 600;
}

.meta-height {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
}

.meta-mode {
  background: rgba(251, 191, 36, 0.15);
  color: #fcd34d;
  text-transform: uppercase;
}

/* Setup Sections */
.setup-section {
  margin-bottom: 12px;
}

.setup-section-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.side-section {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(245, 158, 11, 0.3);
}

.side-label {
  color: #f59e0b;
}

/* Setup Tabs */
.setup-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.setup-tab {
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid var(--border-hover);
  cursor: pointer;
  background: var(--bg-input);
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.setup-tab:hover {
  background: var(--bg-card-hover);
  color: var(--text-secondary);
}

.setup-tab.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(139, 92, 246, 0.3));
  border-color: rgba(99, 102, 241, 0.5);
  color: #c4b5fd;
}

.setup-tab-side {
  border-color: rgba(245, 158, 11, 0.2);
}

.setup-tab-side:hover {
  background: rgba(245, 158, 11, 0.15);
  color: #fcd34d;
}

.setup-tab-side.active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.3), rgba(251, 191, 36, 0.3));
  border-color: rgba(245, 158, 11, 0.5);
  color: #fcd34d;
}

.setup-type {
  font-size: 12px;
  color: #6ee7b7;
  background: rgba(16, 185, 129, 0.1);
  padding: 6px 12px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 16px;
}

/* Grid Table */
.grid-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--table-bg);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.grid-table th,
.grid-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.grid-table th {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--table-header-bg);
}

.grid-table th.col-y {
  color: #fbbf24;
  width: 80px;
}

.grid-table th.col-front {
  color: #34d399;
}

.grid-table th.col-front-low {
  color: #22d3ee;
}

.grid-table th.col-back {
  color: #fb7185;
}

.grid-table tr:last-child td {
  border-bottom: none;
}

.grid-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

html.light-mode .grid-table tr:hover td {
  background: rgba(0, 0, 0, 0.02);
}

.grid-table td {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}

/* Section Headers */
.section-header td {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: var(--table-header-bg);
  padding: 10px 18px;
}

.other-height td {
  background: rgba(239, 68, 68, 0.05);
}

.other-height:hover td {
  background: rgba(239, 68, 68, 0.08);
}

.y-cell {
  font-weight: 700;
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.08);
}

.coord-cell {
  color: var(--text-secondary);
}

.coord-chip {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px 12px;
  margin: 2px 4px 2px 0;
  background: var(--chip-bg);
  border-radius: 6px;
  border: 1px solid var(--border-color);
  font-size: 12px;
  transition: all 0.15s;
}

.coord-chip:hover {
  background: var(--chip-hover);
  transform: translateY(-1px);
}

/* Tags for notes */
.tag {
  font-size: 9px;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tag-double {
  background: rgba(139, 92, 246, 0.3);
  color: #c4b5fd;
}

.tag-note {
  background: rgba(251, 191, 36, 0.2);
  color: #fcd34d;
  text-transform: none;
  font-size: 10px;
}

.empty-cell {
  color: var(--text-faint);
}

.no-data {
  text-align: center;
  padding: 40px;
  color: var(--text-faint);
}

/* Info Page */
.info-page {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.info-content {
  max-width: 800px;
  width: 100%;
}

.info-content h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.info-content p {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.6;
}

/* Announcement */
.announcement {
  padding: 12px 24px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  font-size: 14px;
  font-weight: 500;
}

.announcement-info {
  background: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
  border-bottom: 1px solid rgba(59, 130, 246, 0.3);
}

.announcement-warning {
  background: rgba(245, 158, 11, 0.2);
  color: #fcd34d;
  border-bottom: 1px solid rgba(245, 158, 11, 0.3);
}

.announcement-success {
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b6;
  border-bottom: 1px solid rgba(16, 185, 129, 0.3);
}

.announcement-error {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
  border-bottom: 1px solid rgba(239, 68, 68, 0.3);
}

.announcement button {
  background: none;
  border: none;
  color: inherit;
  font-size: 20px;
  cursor: pointer;
  opacity: 0.7;
  line-height: 1;
}

.announcement button:hover {
  opacity: 1;
}

/* Light mode overrides */
html.light-mode .grid-table th.col-y {
  color: #b45309;
}

html.light-mode .grid-table th.col-front {
  color: #059669;
}

html.light-mode .grid-table th.col-front-low {
  color: #0891b2;
}

html.light-mode .grid-table th.col-back {
  color: #e11d48;
}

html.light-mode .y-cell {
  color: #b45309;
  background: rgba(251, 191, 36, 0.15);
}

html.light-mode .meta-height {
  background: rgba(99, 102, 241, 0.2);
  color: #4f46e5;
}

html.light-mode .setup-tab.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(139, 92, 246, 0.2));
  color: #6d28d9;
}

html.light-mode .setup-tab-side.active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(251, 191, 36, 0.2));
  color: #b45309;
}

html.light-mode .side-label {
  color: #b45309;
}

html.light-mode .setup-type {
  color: #059669;
  background: rgba(16, 185, 129, 0.15);
}

html.light-mode .tag-double {
  background: rgba(139, 92, 246, 0.2);
  color: #6d28d9;
}

html.light-mode .tag-note {
  background: rgba(251, 191, 36, 0.25);
  color: #b45309;
}

html.light-mode .tower-btn.small-active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(6, 182, 212, 0.15));
  border-color: rgba(16, 185, 129, 0.4);
  color: #059669;
}

html.light-mode .tower-btn.medium-active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(99, 102, 241, 0.15));
  border-color: rgba(59, 130, 246, 0.4);
  color: #2563eb;
}

html.light-mode .tower-btn.tall-active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(239, 68, 68, 0.15));
  border-color: rgba(245, 158, 11, 0.4);
  color: #b45309;
}

html.light-mode .tower-btn.special-active {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.15));
  border-color: rgba(139, 92, 246, 0.4);
  color: #7c3aed;
}

html.light-mode .section-header td {
  color: #334155;
}

html.light-mode .announcement-info {
  background: rgba(59, 130, 246, 0.15);
  color: #1d4ed8;
}

html.light-mode .announcement-warning {
  background: rgba(245, 158, 11, 0.15);
  color: #b45309;
}

html.light-mode .announcement-success {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
}

html.light-mode .announcement-error {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

/* Responsive - Tablet and below */
@media (max-width: 900px) {
  html, body {
    overflow: auto;
    height: auto;
    min-height: 100vh;
  }

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

  .sidebar {
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tower-group {
    margin-bottom: 16px;
  }

  .tower-list {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 6px;
    padding-bottom: 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--border-hover) transparent;
  }

  .tower-list::-webkit-scrollbar {
    height: 6px;
  }

  .tower-list::-webkit-scrollbar-track {
    background: transparent;
  }

  .tower-list::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 3px;
  }

  .tower-btn {
    flex: 0 0 auto;
    min-width: fit-content;
    white-space: nowrap;
    justify-content: flex-start;
    gap: 8px;
  }

  .tower-btn:hover {
    transform: none;
  }

  .content {
    max-height: none;
    overflow: visible;
  }

  .grid-table {
    font-size: 12px;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .grid-table::-webkit-scrollbar {
    height: 6px;
  }

  .grid-table::-webkit-scrollbar-track {
    background: transparent;
  }

  .grid-table::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 3px;
  }

  .grid-table thead,
  .grid-table tbody {
    display: table;
    width: 100%;
  }

  .grid-table th,
  .grid-table td {
    padding: 10px 12px;
  }

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

  .setup-tabs {
    flex-wrap: wrap;
    gap: 6px;
  }

  .setup-tab {
    white-space: nowrap;
  }

  .header-buttons {
    flex-wrap: wrap;
  }

  .header-content {
    padding: 0 8px;
  }

  .header {
    padding: 16px 20px;
  }
}

/* Extra small screens */
@media (max-width: 480px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  h1 {
    font-size: 1.25rem;
  }

  .sidebar {
    padding: 16px;
  }

  .content {
    padding: 20px 16px;
  }

  .tower-name {
    font-size: 1.4rem;
  }

  .header-top {
    gap: 8px;
  }

  .grid-table {
    font-size: 11px;
  }

  .grid-table th,
  .grid-table td {
    padding: 8px 10px;
  }

  .coord-chip {
    padding: 4px 8px;
    font-size: 11px;
  }

  .setup-tab {
    padding: 6px 12px;
    font-size: 11px;
  }

  .info-page {
    padding: 20px 16px;
  }
}
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(20, 20, 35, 0.6);
  --bg-card-hover: rgba(30, 30, 50, 0.6);
  --bg-input: rgba(30, 30, 50, 0.4);
  --border-color: rgba(255, 255, 255, 0.06);
  --border-hover: rgba(255, 255, 255, 0.1);
  --text-primary: #f8fafc;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --text-faint: #475569;
  --header-bg: rgba(15, 15, 26, 0.8);
  --sidebar-bg: rgba(20, 20, 35, 0.6);
  --table-bg: rgba(20, 20, 35, 0.5);
  --table-header-bg: rgba(30, 30, 50, 0.6);
  --chip-bg: rgba(55, 65, 81, 0.5);
  --chip-hover: rgba(75, 85, 101, 0.6);
}

html.light-mode {
  --bg-primary: #f8fafc;
  --bg-secondary: #e2e8f0;
  --bg-card: rgba(255, 255, 255, 0.8);
  --bg-card-hover: rgba(241, 245, 249, 0.9);
  --bg-input: rgba(241, 245, 249, 0.8);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(0, 0, 0, 0.15);
  --text-primary: #1e293b;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;
  --text-faint: #cbd5e1;
  --header-bg: rgba(255, 255, 255, 0.9);
  --sidebar-bg: rgba(241, 245, 249, 0.8);
  --table-bg: rgba(255, 255, 255, 0.7);
  --table-header-bg: rgba(241, 245, 249, 0.9);
  --chip-bg: rgba(226, 232, 240, 0.8);
  --chip-hover: rgba(203, 213, 225, 0.9);
}

body {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-primary) 100%);
  color: var(--text-secondary);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
}

html, body {
  overflow: hidden;
  height: 100vh;
}

/* Header */
.header {
  padding: 20px 32px;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.header-content {
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  padding: 0 12px;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #22d3ee 0%, #a78bfa 50%, #f472b6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Header Buttons */
.header-buttons {
  display: flex;
  gap: 8px;
}

.header-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  text-decoration: none;
  background: var(--bg-input);
  border: 1px solid var(--border-hover);
  border-radius: 8px;
  transition: all 0.2s ease;
  cursor: pointer;
}

.header-btn:hover {
  color: var(--text-secondary);
  background: var(--bg-card-hover);
  border-color: var(--border-hover);
}

.header-btn svg {
  flex-shrink: 0;
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
  border: 1px solid var(--border-hover);
  border-radius: 16px;
  width: 90%;
  max-width: 450px;
  max-height: 80vh;
  overflow: hidden;
  transform: scale(0.9) translateY(20px);
  transition: transform 0.3s ease, background 0.3s ease;
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 24px;
  cursor: pointer;
  padding: 0;
  line-height: 1;
  transition: color 0.2s;
}

.modal-close:hover {
  color: var(--text-secondary);
}

.modal-content {
  padding: 24px;
  overflow-y: auto;
  max-height: calc(80vh - 70px);
}

/* Setting Items */
.setting-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.setting-item:last-child {
  border-bottom: none;
}

.setting-label {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.setting-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
}

.setting-desc {
  font-size: 12px;
  color: var(--text-dim);
}

/* Toggle Switch */
.toggle {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
  flex-shrink: 0;
}

.toggle input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(55, 65, 81, 0.6);
  border-radius: 26px;
  transition: all 0.3s ease;
}

.toggle-slider:before {
  position: absolute;
  content: "";
  height: 20px;
  width: 20px;
  left: 3px;
  bottom: 3px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: all 0.3s ease;
}

.toggle input:checked + .toggle-slider {
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
}

.toggle input:checked + .toggle-slider:before {
  transform: translateX(22px);
}

/* Body lock when modal is open */
body.modal-open {
  overflow: hidden;
}

/* Main Layout */
.main {
  flex: 1;
  display: grid;
  grid-template-columns: 200px 1fr;
  width: 100%;
  margin: 0 auto;
}

/* Sidebar */
.sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border-color);
  padding: 20px;
  overflow-y: auto;
  max-height: calc(100vh - 75px);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.tower-group {
  margin-bottom: 24px;
}

.group-label {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-faint);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  padding-left: 4px;
}

.tower-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tower-btn {
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  background: var(--bg-input);
  color: var(--text-muted);
  transition: all 0.15s ease;
  text-align: left;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.tower-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-secondary);
  transform: translateX(4px);
}

.tower-btn.small-active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.2), rgba(6, 182, 212, 0.2));
  border-color: rgba(16, 185, 129, 0.4);
  color: #34d399;
}

.tower-btn.medium-active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(99, 102, 241, 0.2));
  border-color: rgba(59, 130, 246, 0.4);
  color: #60a5fa;
}

.tower-btn.tall-active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(239, 68, 68, 0.2));
  border-color: rgba(245, 158, 11, 0.4);
  color: #fbbf24;
}

.tower-btn.special-active {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(236, 72, 153, 0.2));
  border-color: rgba(139, 92, 246, 0.4);
  color: #a78bfa;
}

.tower-height {
  font-size: 11px;
  color: var(--text-dim);
  font-family: monospace;
  margin-left: 8px;
  flex-shrink: 0;
}

/* Content Area */
.content {
  padding: 28px;
  overflow-y: auto;
  max-height: calc(100vh - 75px);
}

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

.header-top {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.tower-name {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tower-alt {
  font-size: 1rem;
  color: var(--text-dim);
}

.meta-tag {
  font-size: 11px;
  padding: 4px 10px;
  border-radius: 6px;
  font-weight: 600;
}

.meta-height {
  background: rgba(99, 102, 241, 0.15);
  color: #a5b4fc;
}

.meta-mode {
  background: rgba(251, 191, 36, 0.15);
  color: #fcd34d;
  text-transform: uppercase;
}

/* Setup Sections */
.setup-section {
  margin-bottom: 12px;
}

.setup-section-label {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  margin-bottom: 6px;
}

.side-section {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(245, 158, 11, 0.3);
}

.side-label {
  color: #f59e0b;
}

/* Setup Tabs */
.setup-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.setup-tab {
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid var(--border-hover);
  cursor: pointer;
  background: var(--bg-input);
  color: var(--text-muted);
  transition: all 0.15s ease;
}

.setup-tab:hover {
  background: var(--bg-card-hover);
  color: var(--text-secondary);
}

.setup-tab.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.3), rgba(139, 92, 246, 0.3));
  border-color: rgba(99, 102, 241, 0.5);
  color: #c4b5fd;
}

.setup-tab-side {
  border-color: rgba(245, 158, 11, 0.2);
}

.setup-tab-side:hover {
  background: rgba(245, 158, 11, 0.15);
  color: #fcd34d;
}

.setup-tab-side.active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.3), rgba(251, 191, 36, 0.3));
  border-color: rgba(245, 158, 11, 0.5);
  color: #fcd34d;
}

.setup-type {
  font-size: 12px;
  color: #6ee7b7;
  background: rgba(16, 185, 129, 0.1);
  padding: 6px 12px;
  border-radius: 6px;
  display: inline-block;
  margin-bottom: 16px;
}

/* Grid Table */
.grid-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  background: var(--table-bg);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.grid-table th,
.grid-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.grid-table th {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--table-header-bg);
}

.grid-table th.col-y {
  color: #fbbf24;
  width: 80px;
}

.grid-table th.col-front {
  color: #34d399;
}

.grid-table th.col-front-low {
  color: #22d3ee;
}

.grid-table th.col-back {
  color: #fb7185;
}

.grid-table tr:last-child td {
  border-bottom: none;
}

.grid-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

html.light-mode .grid-table tr:hover td {
  background: rgba(0, 0, 0, 0.02);
}

.grid-table td {
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}

/* Section Headers */
.section-header td {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: var(--table-header-bg);
  padding: 10px 18px;
}

.other-height td {
  background: rgba(239, 68, 68, 0.05);
}

.other-height:hover td {
  background: rgba(239, 68, 68, 0.08);
}

.y-cell {
  font-weight: 700;
  color: #fbbf24;
  background: rgba(251, 191, 36, 0.08);
}

.coord-cell {
  color: var(--text-secondary);
}

.coord-chip {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px 12px;
  margin: 2px 4px 2px 0;
  background: var(--chip-bg);
  border-radius: 6px;
  border: 1px solid var(--border-color);
  font-size: 12px;
  transition: all 0.15s;
}

.coord-chip:hover {
  background: var(--chip-hover);
  transform: translateY(-1px);
}

/* Tags for notes */
.tag {
  font-size: 9px;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tag-double {
  background: rgba(139, 92, 246, 0.3);
  color: #c4b5fd;
}

.tag-note {
  background: rgba(251, 191, 36, 0.2);
  color: #fcd34d;
  text-transform: none;
  font-size: 10px;
}

.empty-cell {
  color: var(--text-faint);
}

.no-data {
  text-align: center;
  padding: 40px;
  color: var(--text-faint);
}

/* Info Page */
.info-page {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.info-content {
  max-width: 800px;
  width: 100%;
}

.info-content h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.info-content p {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.6;
}

/* Announcement */
.announcement {
  padding: 12px 24px;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  font-size: 14px;
  font-weight: 500;
}

.announcement-info {
  background: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
  border-bottom: 1px solid rgba(59, 130, 246, 0.3);
}

.announcement-warning {
  background: rgba(245, 158, 11, 0.2);
  color: #fcd34d;
  border-bottom: 1px solid rgba(245, 158, 11, 0.3);
}

.announcement-success {
  background: rgba(16, 185, 129, 0.2);
  color: #6ee7b6;
  border-bottom: 1px solid rgba(16, 185, 129, 0.3);
}

.announcement-error {
  background: rgba(239, 68, 68, 0.2);
  color: #fca5a5;
  border-bottom: 1px solid rgba(239, 68, 68, 0.3);
}

.announcement button {
  background: none;
  border: none;
  color: inherit;
  font-size: 20px;
  cursor: pointer;
  opacity: 0.7;
  line-height: 1;
}

.announcement button:hover {
  opacity: 1;
}

/* Light mode overrides */
html.light-mode .grid-table th.col-y {
  color: #b45309;
}

html.light-mode .grid-table th.col-front {
  color: #059669;
}

html.light-mode .grid-table th.col-front-low {
  color: #0891b2;
}

html.light-mode .grid-table th.col-back {
  color: #e11d48;
}

html.light-mode .y-cell {
  color: #b45309;
  background: rgba(251, 191, 36, 0.15);
}

html.light-mode .meta-height {
  background: rgba(99, 102, 241, 0.2);
  color: #4f46e5;
}

html.light-mode .setup-tab.active {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(139, 92, 246, 0.2));
  color: #6d28d9;
}

html.light-mode .setup-tab-side.active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.2), rgba(251, 191, 36, 0.2));
  color: #b45309;
}

html.light-mode .side-label {
  color: #b45309;
}

html.light-mode .setup-type {
  color: #059669;
  background: rgba(16, 185, 129, 0.15);
}

html.light-mode .tag-double {
  background: rgba(139, 92, 246, 0.2);
  color: #6d28d9;
}

html.light-mode .tag-note {
  background: rgba(251, 191, 36, 0.25);
  color: #b45309;
}

html.light-mode .tower-btn.small-active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15), rgba(6, 182, 212, 0.15));
  border-color: rgba(16, 185, 129, 0.4);
  color: #059669;
}

html.light-mode .tower-btn.medium-active {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.15), rgba(99, 102, 241, 0.15));
  border-color: rgba(59, 130, 246, 0.4);
  color: #2563eb;
}

html.light-mode .tower-btn.tall-active {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(239, 68, 68, 0.15));
  border-color: rgba(245, 158, 11, 0.4);
  color: #b45309;
}

html.light-mode .tower-btn.special-active {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(236, 72, 153, 0.15));
  border-color: rgba(139, 92, 246, 0.4);
  color: #7c3aed;
}

html.light-mode .section-header td {
  color: #334155;
}

html.light-mode .announcement-info {
  background: rgba(59, 130, 246, 0.15);
  color: #1d4ed8;
}

html.light-mode .announcement-warning {
  background: rgba(245, 158, 11, 0.15);
  color: #b45309;
}

html.light-mode .announcement-success {
  background: rgba(16, 185, 129, 0.15);
  color: #059669;
}

html.light-mode .announcement-error {
  background: rgba(239, 68, 68, 0.15);
  color: #dc2626;
}

/* Responsive - Tablet and below */
@media (max-width: 900px) {
  html, body {
    overflow: auto;
    height: auto;
    min-height: 100vh;
  }

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

  .sidebar {
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .tower-group {
    margin-bottom: 16px;
  }

  .tower-list {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 6px;
    padding-bottom: 8px;
    scrollbar-width: thin;
    scrollbar-color: var(--border-hover) transparent;
  }

  .tower-list::-webkit-scrollbar {
    height: 6px;
  }

  .tower-list::-webkit-scrollbar-track {
    background: transparent;
  }

  .tower-list::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 3px;
  }

  .tower-btn {
    flex: 0 0 auto;
    min-width: fit-content;
    white-space: nowrap;
    justify-content: flex-start;
    gap: 8px;
  }

  .tower-btn:hover {
    transform: none;
  }

  .content {
    max-height: none;
    overflow: visible;
  }

  .grid-table {
    font-size: 12px;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .grid-table::-webkit-scrollbar {
    height: 6px;
  }

  .grid-table::-webkit-scrollbar-track {
    background: transparent;
  }

  .grid-table::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 3px;
  }

  .grid-table thead,
  .grid-table tbody {
    display: table;
    width: 100%;
  }

  .grid-table th,
  .grid-table td {
    padding: 10px 12px;
  }

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

  .setup-tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: var(--border-hover) transparent;
  }

  .setup-tabs::-webkit-scrollbar {
    height: 6px;
  }

  .setup-tabs::-webkit-scrollbar-track {
    background: transparent;
  }

  .setup-tabs::-webkit-scrollbar-thumb {
    background: var(--border-hover);
    border-radius: 3px;
  }

  .setup-tab {
    white-space: nowrap;
    flex-shrink: 0;
  }

  .header-buttons {
    flex-wrap: wrap;
  }

  .header-content {
    padding: 0 8px;
  }

  .header {
    padding: 16px 20px;
  }
}

/* Extra small screens */
@media (max-width: 480px) {
  .header-content {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  h1 {
    font-size: 1.25rem;
  }

  .sidebar {
    padding: 16px;
  }

  .content {
    padding: 20px 16px;
  }

  .tower-name {
    font-size: 1.4rem;
  }

  .header-top {
    gap: 8px;
  }

  .grid-table {
    font-size: 11px;
  }

  .grid-table th,
  .grid-table td {
    padding: 8px 10px;
  }

  .coord-chip {
    padding: 4px 8px;
    font-size: 11px;
  }

  .setup-tab {
    padding: 6px 12px;
    font-size: 11px;
  }

  .info-page {
    padding: 20px 16px;
  }
}