:root {
  --bg: #eef4f8;
  --panel: #ffffff;
  --text: #102334;
  --muted: #6b7e8d;
  --line: #d9e4eb;
  --primary: #0c6b88;
  --primary-strong: #064b63;
  --accent: #21a1c4;
  --danger: #b42318;
  --ok: #067647;
  --warn: #b54708;
  --shadow: 0 10px 28px rgba(9, 39, 58, .08);
}
body.dark {
  --bg: #07131d;
  --panel: #0f2230;
  --text: #eff8fc;
  --muted: #9db0bd;
  --line: #29404f;
  --primary: #25a4c8;
  --primary-strong: #6fd7ef;
  --accent: #48cae4;
  --danger: #ff8a80;
  --ok: #56d69b;
  --warn: #ffb86b;
  --shadow: 0 10px 28px rgba(0, 0, 0, .25);
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: calc(env(safe-area-inset-top) + 14px) 18px 14px;
  color: white;
  background: linear-gradient(135deg, #061a2b, #0a5470);
  box-shadow: 0 8px 20px rgba(0,0,0,.18);
}
.app-header h1 { margin: 2px 0 0; font-size: 24px; }
.eyebrow {
  margin: 0;
  font-size: 11px;
  letter-spacing: .14em;
  font-weight: 700;
  opacity: .72;
}
.icon-btn {
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 14px;
  color: white;
  background: rgba(255,255,255,.10);
}
main { max-width: 820px; margin: 0 auto; padding: 12px 14px 34px; }
.tabs {
  display: flex;
  gap: 7px;
  overflow-x: auto;
  padding: 4px 0 12px;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab {
  flex: 0 0 auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 9px 14px;
  color: var(--muted);
  background: var(--panel);
}
.tab.active {
  color: white;
  border-color: var(--primary);
  background: var(--primary);
}
.panel { display: none; }
.panel.active { display: block; animation: fade .18s ease; }
@keyframes fade { from {opacity:.4; transform: translateY(4px)} to {opacity:1; transform:none} }
.hero {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 22px;
  border-radius: 22px;
  color: white;
  background: linear-gradient(145deg, #073047, #0b6d88);
  box-shadow: var(--shadow);
}
.hero h2 { margin: 8px 0 6px; font-size: 24px; }
.hero p { margin: 0; opacity: .84; }
.badge {
  display: inline-block;
  border: 1px solid rgba(255,255,255,.35);
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 12px;
}
.ship-mark { font-size: 56px; opacity: .9; }
.quick-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px;
  margin-top: 14px;
}
.quick-card {
  min-height: 142px;
  padding: 16px;
  text-align: left;
  border: 1px solid var(--line);
  border-radius: 20px;
  color: var(--text);
  background: var(--panel);
  box-shadow: var(--shadow);
}
.quick-card strong, .quick-card small { display: block; }
.quick-card strong { margin: 10px 0 5px; }
.quick-card small { color: var(--muted); line-height: 1.35; }
.quick-icon { font-size: 30px; }
.notice {
  margin-top: 14px;
  padding: 16px;
  border-left: 4px solid var(--accent);
  border-radius: 14px;
  background: var(--panel);
}
.notice p { margin: 5px 0 0; color: var(--muted); line-height: 1.45; }
.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 6px 2px 12px;
}
.section-head h2 { margin: 2px 0 0; font-size: 24px; }
.segmented {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 5px;
  padding: 4px;
  margin-bottom: 12px;
  border-radius: 14px;
  background: color-mix(in srgb, var(--line) 70%, transparent);
}
.seg {
  border: 0;
  border-radius: 11px;
  padding: 10px;
  color: var(--muted);
  background: transparent;
}
.seg.active { color: var(--text); background: var(--panel); box-shadow: 0 2px 8px rgba(0,0,0,.08); }
.form-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.form-card h3 { margin: 18px 0 10px; font-size: 15px; }
.form-card h3:first-child { margin-top: 0; }
.form-grid { display: grid; gap: 12px; }
.form-grid.two { grid-template-columns: repeat(2, minmax(0,1fr)); }
label {
  display: block;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}
input, select, textarea {
  display: block;
  width: 100%;
  margin-top: 6px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  color: var(--text);
  background: var(--bg);
  outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
small { color: var(--muted); font-weight: 400; }
.primary, .secondary, .danger {
  width: 100%;
  border-radius: 13px;
  padding: 13px 16px;
  font-weight: 700;
}
.primary { border: 0; color: white; background: var(--primary); }
.secondary { width: auto; border: 1px solid var(--line); color: var(--text); background: var(--panel); }
.danger { margin-top: 14px; border: 1px solid color-mix(in srgb, var(--danger) 45%, var(--line)); color: var(--danger); background: transparent; }
.hidden { display: none !important; }
.result-card {
  margin-top: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.result-card.empty { color: var(--muted); text-align: center; }
.result-title { margin: 0 0 12px; font-size: 14px; color: var(--muted); }
.metric-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
.metric { padding: 13px; border-radius: 14px; background: var(--bg); }
.metric span { display:block; font-size:12px; color:var(--muted); }
.metric strong { display:block; margin-top:4px; font-size:20px; }
.metric.full { grid-column: 1 / -1; }
.status-ok { color: var(--ok); }
.status-warn { color: var(--warn); }
.logline { margin-top: 12px; padding: 12px; border-radius: 12px; background: var(--bg); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; line-height:1.45; }
.history-list { display: grid; gap: 10px; }
.history-item { padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel); }
.history-item header { display:flex; justify-content:space-between; gap:10px; }
.history-item p { margin: 8px 0 0; color: var(--muted); }
.empty-history { padding: 28px; text-align:center; color:var(--muted); border:1px dashed var(--line); border-radius:16px; }
footer { padding: 0 14px calc(env(safe-area-inset-bottom) + 20px); text-align:center; color:var(--muted); font-size:12px; }
@media (max-width: 560px) {
  .quick-grid, .form-grid.two, .metric-grid { grid-template-columns: 1fr; }
  .metric.full { grid-column: auto; }
  .hero { align-items: flex-start; }
  .ship-mark { font-size: 44px; }
}

.full-btn{width:100%}
.book-table{width:100%;border-collapse:collapse;margin-top:12px;font-size:13px}
.book-table th,.book-table td{border:1px solid var(--line);padding:8px;text-align:left}
.book-table th{background:var(--bg)}

.calc-note{
  margin:12px 2px 0;
  color:var(--muted);
  font-size:12px;
  line-height:1.45;
}

.full-span{grid-column:1/-1}.helper-text{margin:-2px 0 12px;color:var(--muted);font-size:12px;line-height:1.45}@media(max-width:560px){.full-span{grid-column:auto}}

.compass-subtabs{grid-template-columns:repeat(3,1fr)}
.compass-pane{display:none}
.compass-pane.active{display:block}
.applied-data{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:10px;
  margin:4px 0 16px;
}
.applied-data>div{
  padding:12px;
  border:1px solid var(--line);
  border-radius:13px;
  background:var(--bg);
}
.applied-data span{display:block;color:var(--muted);font-size:12px}
.applied-data strong{display:block;margin-top:4px}
@media(max-width:560px){
  .compass-subtabs{grid-template-columns:1fr}
  .applied-data{grid-template-columns:1fr}
}

.ukc-subtabs{grid-template-columns:repeat(4,1fr)}
.ukc-pane{display:none}
.ukc-pane.active{display:block}
.ecdis-entry-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:12px;
  margin:16px 0;
}
.ecdis-entry-grid>div{
  padding:14px;
  border:1px solid var(--line);
  border-radius:14px;
  background:var(--bg);
}
.ecdis-entry-grid span{display:block;color:var(--muted);font-size:12px}
.ecdis-entry-grid strong{display:block;margin-top:5px;font-size:19px}
@media(max-width:700px){
  .ukc-subtabs{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:480px){
  .ukc-subtabs,.ecdis-entry-grid{grid-template-columns:1fr}
}

.app-version{display:block;margin-top:2px;color:var(--muted);font-size:11px;font-weight:700;letter-spacing:.08em}

/* Compass Observation v4.0 — Excel replacement */
.compass-subtabs{grid-template-columns:repeat(4,1fr)}
.excel-legend{border-left-color:#d4a800}
.excel-input>input,.excel-input>select{
  background:color-mix(in srgb,#f3d64e 24%,var(--bg));
  border-color:color-mix(in srgb,#d4a800 42%,var(--line));
}
body.dark .excel-input>input,body.dark .excel-input>select{
  background:color-mix(in srgb,#d4a800 14%,var(--bg));
}
.ship-head-results{grid-template-columns:repeat(4,minmax(0,1fr))}
.manual-bearing-box{margin:12px 0;padding:12px;border:1px dashed var(--line);border-radius:14px}
.action-row{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
.action-row>button{flex:1;min-width:180px}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.excel-result-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:10px;
  margin:14px 0;
}
.excel-result-group{
  padding:12px;
  border:1px solid var(--line);
  border-radius:14px;
  background:var(--bg);
}
.excel-result-group>span{
  display:block;
  margin-bottom:8px;
  color:var(--muted);
  font-size:11px;
  font-weight:800;
  letter-spacing:.05em;
}
.excel-result-group>div{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:8px;
  padding:5px 0;
  border-top:1px solid color-mix(in srgb,var(--line) 70%,transparent);
}
.excel-result-group>div:first-of-type{border-top:0}
.excel-result-group small{font-size:10px;font-weight:700}
.excel-result-group strong{font-size:15px}
.compass-log-list{display:grid;gap:10px;margin-top:14px}
.compass-log-item{
  padding:13px;
  border:1px solid var(--line);
  border-radius:15px;
  background:var(--bg);
}
.compass-log-item header{display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap}
.compass-log-item header small{font-size:11px}
.compass-log-item>div{display:flex;gap:8px;flex-wrap:wrap;margin-top:9px}
.compass-log-item>div span{
  padding:5px 8px;
  border-radius:999px;
  background:var(--panel);
  color:var(--muted);
  font-size:11px;
}
.compact-head{margin-bottom:4px}
@media(max-width:760px){
  .excel-result-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ship-head-results{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:560px){
  .compass-subtabs{grid-template-columns:repeat(2,1fr)}
  .excel-result-grid,.ship-head-results{grid-template-columns:1fr}
  .action-row{flex-direction:column}
  .action-row>button{min-width:0;width:100%}
}