/* ─── PSHA Tool - style.css ─── */
:root {
  --bg: #0f1117;
  --surface: #1a1d29;
  --surface2: #242736;
  --border: #2e3140;
  --text: #e0e0e6;
  --text2: #9ca3af;
  --accent: #3b82f6;
  --accent2: #2563eb;
  --success: #22c55e;
  --warn: #f59e0b;
  --danger: #ef4444;
}
* { margin:0; padding:0; box-sizing:border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif; background:var(--bg); color:var(--text); display:flex; min-height:100vh; }

/* Sidebar */
.sidebar { width:260px; background:var(--surface); border-right:1px solid var(--border); padding:20px 0; flex-shrink:0; position:fixed; top:0; bottom:0; overflow-y:auto; z-index:10; }
.sidebar h2 { padding:0 20px 4px; font-size:18px; color:var(--accent); }
.sidebar .subtitle { padding:0 20px 16px; font-size:12px; color:var(--text2); }
.sidebar hr { border:none; border-top:1px solid var(--border); margin:8px 20px; }
.sidebar a { display:block; padding:9px 20px; color:var(--text2); text-decoration:none; font-size:14px; transition:0.15s; }
.sidebar a:hover, .sidebar a.active { background:var(--surface2); color:var(--text); border-left:3px solid var(--accent); }
.sidebar .disclaimer { padding:12px 20px; font-size:11px; color:var(--warn); line-height:1.5; margin-top:12px; border-top:1px solid var(--border); }
.sidebar .footer { padding:16px 20px; font-size:11px; color:var(--text2); position:absolute; bottom:0; }

/* Main */
.main { margin-left:260px; flex:1; padding:32px 40px; max-width:1200px; }
.main h1 { font-size:26px; margin-bottom:6px; }
.main h2 { font-size:20px; margin:24px 0 12px; color:var(--accent); }
.main p, .main li { line-height:1.7; color:var(--text2); }
.main a { color:var(--accent); }

/* Pages */
.page { display:none; }
.page.active { display:block; }

/* Forms */
.form-row { display:flex; gap:16px; flex-wrap:wrap; margin-bottom:16px; }
.form-group { display:flex; flex-direction:column; flex:1; min-width:160px; }
.form-group label { font-size:12px; color:var(--text2); margin-bottom:4px; font-weight:600; text-transform:uppercase; letter-spacing:0.5px; }
.form-group input, .form-group select, .form-group textarea {
  background:var(--surface2); border:1px solid var(--border); color:var(--text);
  padding:8px 12px; border-radius:6px; font-size:14px; outline:none; transition:0.2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { border-color:var(--accent); }
textarea { resize:vertical; font-family:monospace; }

/* File upload */
.file-upload { border:2px dashed var(--border); border-radius:8px; padding:24px; text-align:center; color:var(--text2); cursor:pointer; transition:0.2s; margin-bottom:16px; position:relative; }
.file-upload:hover { border-color:var(--accent); color:var(--text); }
.file-upload input { position:absolute; inset:0; opacity:0; cursor:pointer; }
.file-upload.has-file { border-color:var(--success); color:var(--success); }

/* Buttons */
.btn { padding:10px 24px; border:none; border-radius:6px; font-size:14px; font-weight:600; cursor:pointer; transition:0.2s; display:inline-flex; align-items:center; gap:8px; }
.btn-primary { background:var(--accent); color:#fff; }
.btn-primary:hover { background:var(--accent2); }
.btn-secondary { background:var(--surface2); color:var(--text); border:1px solid var(--border); }
.btn-secondary:hover { background:var(--border); }
.btn:disabled { opacity:0.5; cursor:not-allowed; }

/* Results */
.result-card { background:var(--surface); border:1px solid var(--border); border-radius:8px; padding:20px; margin:16px 0; }
.result-card h3 { font-size:16px; margin-bottom:12px; }
.metrics { display:flex; gap:16px; flex-wrap:wrap; margin:12px 0; }
.metric { background:var(--surface2); border-radius:6px; padding:12px 20px; text-align:center; }
.metric .value { font-size:24px; font-weight:700; color:var(--accent); }
.metric .label { font-size:11px; color:var(--text2); text-transform:uppercase; }
.plot-img { max-width:100%; border-radius:6px; margin:12px 0; border:1px solid var(--border); }

/* Side-by-side plots */
.plot-compare { display:flex; gap:16px; flex-wrap:wrap; }
.plot-compare .plot-panel { flex:1; min-width:400px; }
.plot-compare .plot-panel h4 { margin-bottom:8px; font-size:14px; color:var(--text2); }

/* Map */
.map-container { width:100%; height:500px; border-radius:8px; border:1px solid var(--border); margin:12px 0; }

/* Table */
table { width:100%; border-collapse:collapse; font-size:13px; margin:12px 0; }
th, td { padding:8px 12px; text-align:left; border-bottom:1px solid var(--border); }
th { background:var(--surface2); color:var(--text2); font-weight:600; text-transform:uppercase; font-size:11px; }

/* Spinner */
.spinner { display:none; }
.spinner.show { display:inline-block; width:20px; height:20px; border:3px solid var(--border); border-top-color:var(--accent); border-radius:50%; animation:spin 0.6s linear infinite; margin-left:8px; vertical-align:middle; }
@keyframes spin { to { transform:rotate(360deg); } }

/* Tabs within page */
.tab-bar { display:flex; gap:2px; margin-bottom:16px; border-bottom:1px solid var(--border); }
.tab-bar button { background:none; border:none; color:var(--text2); padding:10px 20px; cursor:pointer; font-size:14px; border-bottom:2px solid transparent; transition:0.2s; }
.tab-bar button.active { color:var(--accent); border-bottom-color:var(--accent); }
.tab-content { display:none; }
.tab-content.active { display:block; }

/* QAQC */
.qaqc-entry { padding:8px 12px; border-left:3px solid var(--accent); background:var(--surface2); margin:6px 0; border-radius:0 4px 4px 0; font-size:13px; }
.qaqc-entry .time { color:var(--text2); font-size:11px; }

/* Changelog */
.changelog h3 { color:var(--success); margin-top:20px; }
.changelog ul { padding-left:20px; margin:8px 0; }
.changelog li { margin:4px 0; }

/* Toast */
.toast { position:fixed; bottom:20px; right:20px; background:var(--success); color:#fff; padding:12px 20px; border-radius:8px; font-size:14px; z-index:999; opacity:0; transition:opacity 0.3s; pointer-events:none; }
.toast.show { opacity:1; }

@media(max-width:768px) {
  .sidebar { display:none; }
  .main { margin-left:0; padding:16px; }
  .form-row { flex-direction:column; }
  .plot-compare { flex-direction:column; }
  .plot-compare .plot-panel { min-width:100%; }
}