* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: #0d1117; color: #c9d1d9; line-height: 1.6; }
.container { max-width: 800px; margin: 0 auto; padding: 20px; }
header { text-align: center; padding: 30px 0; }
header h1 { font-size: 1.8rem; color: #f0f6fc; margin-bottom: 8px; }
header p { color: #8b949e; }

.card { background: #161b22; border: 1px solid #30363d; border-radius: 8px; padding: 24px; margin-bottom: 20px; }
.card h2 { font-size: 1.2rem; margin-bottom: 16px; color: #f0f6fc; }
.card h3 { font-size: 1rem; margin-bottom: 12px; color: #c9d1d9; }

/* Steps */
.steps { display: flex; gap: 8px; margin-bottom: 24px; flex-wrap: wrap; }
.step { padding: 6px 14px; border-radius: 20px; font-size: 0.85rem; background: #21262d; color: #8b949e; }
.step.active { background: #1f6feb; color: #fff; }
.step.done { background: #238636; color: #fff; }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; color: #c9d1d9; }
.form-control, input[type="text"], input[type="password"], select { width: 100%; padding: 10px 12px; background: #0d1117; border: 1px solid #30363d; border-radius: 6px; color: #c9d1d9; font-size: 1rem; }
.form-control:focus, input:focus { outline: none; border-color: #1f6feb; }
.help-text { font-size: 0.85rem; color: #8b949e; }

/* Buttons */
.btn { display: inline-block; padding: 10px 20px; border-radius: 6px; font-size: 0.95rem; font-weight: 500; text-decoration: none; border: none; cursor: pointer; }
.btn-primary { background: #238636; color: #fff; }
.btn-primary:hover { background: #2ea043; }
.btn-primary:disabled { background: #21262d; color: #484f58; cursor: not-allowed; }
.btn-secondary { background: #21262d; color: #c9d1d9; border: 1px solid #30363d; }
.btn-secondary:hover { background: #30363d; }
.btn-large { width: 100%; padding: 14px; font-size: 1.1rem; margin-top: 20px; }

/* Alerts */
.alert { padding: 12px 16px; border-radius: 6px; margin-bottom: 16px; }
.alert-error { background: #3d1214; border: 1px solid #8b1a1a; color: #f85149; }

/* Survey list */
.survey-list, .period-list { display: flex; flex-direction: column; gap: 8px; }
.survey-item, .period-item { display: flex; justify-content: space-between; align-items: center; padding: 12px 16px; background: #0d1117; border: 1px solid #30363d; border-radius: 6px; text-decoration: none; color: #c9d1d9; transition: border-color 0.2s; }
.survey-item:hover, .period-item:hover { border-color: #1f6feb; }
.survey-name, .period-name { font-weight: 500; }
.survey-meta, .period-meta { display: flex; gap: 6px; }

.badge { padding: 2px 8px; border-radius: 12px; font-size: 0.75rem; background: #21262d; color: #8b949e; }
.badge-active { background: #238636; color: #fff; }

.empty { color: #8b949e; text-align: center; padding: 20px; }

/* Region browser */
.region-node { display: flex; align-items: center; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid #21262d; }
.region-label { display: flex; align-items: center; gap: 8px; cursor: pointer; flex: 1; }
.region-label input[type="checkbox"] { width: 18px; height: 18px; cursor: pointer; }
.btn-drill { background: #21262d; border: 1px solid #30363d; border-radius: 4px; color: #c9d1d9; padding: 4px 10px; cursor: pointer; font-size: 0.85rem; }
.btn-drill:hover { background: #30363d; border-color: #1f6feb; }

.drill-area { margin-top: 16px; padding-top: 16px; border-top: 1px solid #30363d; }
.drill-area h3 { margin-bottom: 12px; }

#selection-summary ul { padding-left: 20px; }
#selection-summary li { margin-bottom: 4px; }

/* Progress bar */
.progress-bar-container { background: #21262d; border-radius: 8px; height: 20px; overflow: hidden; margin-bottom: 12px; }
.progress-bar { height: 100%; background: linear-gradient(90deg, #1f6feb, #238636); border-radius: 8px; transition: width 0.5s ease; width: 0%; }
.progress-text { font-size: 1rem; padding: 8px 0; color: #c9d1d9; }

/* Log viewer */
.log-viewer { background: #0d1117; border: 1px solid #30363d; border-radius: 6px; padding: 12px; height: 300px; overflow-y: auto; font-family: 'Courier New', monospace; font-size: 0.8rem; line-height: 1.5; }
.log-viewer .log-empty { color: #484f58; text-align: center; padding: 40px 0; }
.log-line { padding: 1px 0; }
.log-time { color: #484f58; margin-right: 8px; }
.log-text { color: #c9d1d9; white-space: pre-wrap; word-break: break-all; }

.download-area { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }

/* Region badge */
.region-badge { display: inline-block; padding: 4px 12px; background: #1f6feb22; border: 1px solid #1f6feb; border-radius: 12px; font-size: 0.85rem; margin-top: 4px; }