html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f3f4f6;
  color: #111827;
  font-size: 14px;
}

* {
  box-sizing: border-box;
}

/* App shell: topbar / workspace / summary-bar */
.app-shell {
  height: 100vh;
  display: grid;
  grid-template-rows: 48px 1fr 36px;
  overflow: hidden;
}

/* Topbar */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  background: #1e293b;
  color: #f1f5f9;
  z-index: 10;
  white-space: nowrap;
  overflow-x: auto;
}

.topbar-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.topbar-tag {
  font-size: 12px;
  background: rgba(255, 255, 255, 0.12);
  padding: 2px 8px;
  border-radius: 4px;
  color: #94a3b8;
}

.topbar-center {
  font-size: 12px;
  color: #94a3b8;
  font-family: "SF Mono", "Fira Code", monospace;
}

.topbar-links {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-left: 12px;
}

.topbar-link {
  font-size: 12px;
  font-weight: 700;
  color: #f1f5f9;
  text-decoration: none;
  padding: 5px 14px;
  border-radius: 6px;
  letter-spacing: 0.02em;
  transition: all 0.2s ease;
}

.topbar-link.link-github {
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.topbar-link.link-github:hover {
  background: rgba(255, 255, 255, 0.25);
  border-color: rgba(255, 255, 255, 0.4);
}

.topbar-link.link-usage {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  border: 1px solid #3b82f6;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
}

.topbar-link.link-usage:hover {
  background: linear-gradient(135deg, #4f8cf7, #3b72f2);
  box-shadow: 0 3px 10px rgba(37, 99, 235, 0.45);
}

.topbar-actions {
  margin-left: auto;
  display: flex;
  gap: 8px;
  align-items: center;
}

/* Workspace: map + control panel */
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 460px;
  min-height: 0;
}

.map-workspace {
  position: relative;
  min-width: 0;
  min-height: 0;
}

#map {
  height: 100%;
  width: 100%;
  background: #e5e7eb;
}

.map-info {
  position: absolute;
  bottom: 28px;
  left: 8px;
  z-index: 500;
  background: rgba(15, 23, 42, 0.78);
  backdrop-filter: blur(6px);
  border-radius: 6px;
  padding: 5px 10px;
  font-size: 11px;
  color: #e2e8f0;
  pointer-events: none;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  font-family: "SF Mono", "Fira Code", monospace;
  letter-spacing: 0.02em;
}

/* Control panel */
.control-panel {
  overflow-y: auto;
  border-left: 1px solid #e2e8f0;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
  padding: 4px 0;
}

.panel-section {
  padding: 16px 20px;
  margin: 4px 10px;
  border-radius: 10px;
  background: #ffffff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 0 0 1px rgba(0, 0, 0, 0.03);
}

.panel-title {
  font-size: 12px;
  font-weight: 700;
  color: #0f172a;
  margin: 0 0 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 6px;
}

.panel-title::before {
  content: "";
  display: inline-block;
  width: 3px;
  height: 14px;
  background: #3b82f6;
  border-radius: 2px;
}

.form-row {
  margin-bottom: 10px;
}

.form-row:last-child {
  margin-bottom: 0;
}

.form-row-2col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.form-row-inline {
  display: flex;
  align-items: flex-end;
  gap: 10px;
}

.form-row-inline .form-field {
  flex: 0 0 auto;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.form-field label,
.export-field > span {
  font-size: 11px;
  color: #64748b;
  font-weight: 600;
  letter-spacing: 0.01em;
}

input[type="number"],
input[type="datetime-local"],
.select-input {
  padding: 7px 10px;
  font-size: 13px;
  border-radius: 8px;
  border: 1.5px solid #e2e8f0;
  outline: none;
  background: #f8fafc;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  width: 100%;
  min-width: 0;
  color: #0f172a;
}

input[type="number"]:hover,
input[type="datetime-local"]:hover,
.select-input:hover {
  border-color: #cbd5e1;
  background: #ffffff;
}

input[type="number"]:focus,
input[type="datetime-local"]:focus,
.select-input:focus {
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.12);
  background: #ffffff;
}

.select-input {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}

/* Pace inputs */
.pace-inputs {
  display: flex;
  align-items: center;
  gap: 4px;
}

.pace-inputs input {
  width: 60px;
  text-align: center;
}

.pace-sep {
  font-size: 13px;
  color: #6b7280;
  font-weight: 600;
}

/* Buttons */
button {
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 8px;
  border: none;
  transition: all 0.2s ease;
  letter-spacing: 0.01em;
}

button:active {
  transform: scale(0.97);
}

.btn-primary {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.btn-secondary {
  background: #f1f5f9;
  color: #334155;
  border: 1.5px solid #e2e8f0;
}

.btn-secondary:hover {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

.btn-small {
  padding: 5px 12px;
  font-size: 12px;
}

/* Summary bar */
.summary-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
  background: #1e293b;
  color: #94a3b8;
  font-size: 12px;
  white-space: nowrap;
  overflow-x: auto;
}

.summary-sep {
  color: #475569;
}

/* Message */
.message {
  padding: 10px 16px;
  min-height: 20px;
  font-size: 13px;
  color: #334155;
}

.message.error {
  color: #dc2626;
}

/* Export times container */
.export-times {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 8px;
}

/* Export card: collapsible */
.export-file-card {
  border: 1.5px solid #e2e8f0;
  border-radius: 10px;
  background: #ffffff;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.export-file-card:hover {
  border-color: #cbd5e1;
}

.export-file-card.expanded {
  border-color: #93c5fd;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.08);
}

.export-card-summary {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 9px 12px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 13px;
  color: #111827;
  border-radius: 0;
  transition: background 0.15s ease;
}

.export-card-summary:hover {
  background: #f8fafc;
}

.export-card-summary:active {
  transform: none;
}

.export-title {
  font-weight: 700;
  color: #0f172a;
  flex-shrink: 0;
  font-size: 12px;
}

.export-date {
  color: #475569;
  font-size: 11px;
  font-family: "SF Mono", "Fira Code", monospace;
  flex-shrink: 0;
  background: #f1f5f9;
  padding: 1px 6px;
  border-radius: 4px;
}

.export-meta {
  color: #64748b;
  font-size: 11px;
  margin-left: auto;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.export-expand-icon {
  flex-shrink: 0;
  color: #94a3b8;
  font-size: 10px;
  transition: transform 0.25s ease;
  width: 16px;
  text-align: center;
}

.export-file-card.expanded .export-expand-icon {
  transform: rotate(90deg);
}

.export-card-details {
  display: none;
  padding: 0 12px 12px;
  border-top: 1px solid #f1f5f9;
}

.export-file-card.expanded .export-card-details {
  display: block;
  padding-top: 12px;
}

.export-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.export-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.export-field.export-full-width {
  grid-column: 1 / -1;
}

.export-pace-inputs {
  display: flex;
  align-items: center;
  gap: 4px;
}

.export-pace-inputs input {
  width: 55px;
  text-align: center;
}

.export-card-actions {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
}

.export-card-actions button {
  background: #f8fafc;
  border: 1.5px solid #e2e8f0;
  color: #475569;
  padding: 4px 12px;
  font-size: 12px;
  border-radius: 6px;
}

.export-card-actions button:hover {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

/* Distance info (legacy, kept for compatibility) */
.distance-info {
  min-height: 20px;
  font-size: 13px;
  color: #333;
}

/* Tip */
.tip {
  font-size: 12px;
  color: #666;
}

/* Mobile */
@media (max-width: 960px) {
  .app-shell {
    grid-template-rows: auto 1fr auto;
  }

  .topbar {
    flex-wrap: wrap;
    padding: 8px 12px;
    gap: 6px;
  }

  .topbar-actions {
    margin-left: 0;
    width: 100%;
  }

  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: 45vh 1fr;
  }

  .control-panel {
    border-left: none;
    border-top: 1px solid #e2e8f0;
  }

  .panel-section {
    margin: 4px 6px;
  }
}