:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #667085;
  --line: #d7dde5;
  --blue: #0b5ea8;
  --blue2: #0a4f8c;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial;
  color: var(--text);
  background: var(--bg);
}

.topbar {
  background: linear-gradient(0deg, var(--blue2), var(--blue));
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.topbar-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 16px;
  display: flex;
  gap: 16px;
  align-items: center;
}

.brand-link {
  text-decoration: none;
  color: inherit;
}

.brand-link:hover .brand-title {
  opacity: 0.8;
}

.brand-title {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-subtitle {
  font-size: 12px;
  opacity: 0.9;
  margin-top: 2px;
}

.topnav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.topnav-link {
  color: #eaf2ff;
  text-decoration: none;
  font-size: 14px;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.topnav-link:hover {
  background: rgba(255, 255, 255, 0.1);
}

.topnav-link.active {
  background: rgba(255, 255, 255, 0.18);
}

.page {
  padding: 18px 0 34px;
}

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

.container-wide {
  max-width: 1440px;
}

.notice {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 5px solid var(--blue);
  padding: 12px 14px 12px 10px;
  border-radius: 12px;
  margin: 14px 0 16px;
  color: var(--muted);
}

.notice-success {
  border-left-color: #2e7d32;
  background: #f0faf0;
  color: #1b5e20;
  border-color: #a5d6a7;
}

.notice-error {
  border-left-color: #c62828;
  background: #fff5f5;
  color: #7f1d1d;
  border-color: #ffcdd2;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 8px 22px rgba(18, 27, 38, 0.06);
  overflow: clip;
}

.card-header {
  padding: 14px 16px;
  background: #fbfcfe;
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.card-title {
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--blue2);
}

.card-hint {
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}

.card-body {
  padding: 16px;
}

.card-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: center;
  gap: 10px;
  background: #fbfcfe;
}

.splash {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  padding: 28px 22px 30px;
}

.splash-logo-wrap {
  background: #1D2337;
  border-radius: 20px;
  padding: 18px 24px;
  margin-bottom: 4px;
  border: 1px solid rgba(255,255,255,0.12);
}

.splash-logo {
  width: min(440px, 70vw);
  height: auto;
  display: block;
  filter: drop-shadow(0 10px 22px rgba(18, 27, 38, 0.12));
  border-radius: 16px;
}

.splash-logo-dark {
  display: none;
}

.splash-title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.3px;
}

.splash-subtitle {
  color: var(--muted);
  max-width: 520px;
}

.splash-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 10px;
}

.section {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 12px 10px;
  margin-bottom: 12px;
}

.section legend {
  padding: 0 8px;
  color: var(--blue2);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 10px 12px;
}

.field {
  grid-column: span 6;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

@media (max-width: 860px) {
  .field {
    grid-column: span 12;
  }
}

label {
  font-size: 13px;
  color: var(--muted);
}

input,
select,
textarea {
  width: 100%;
  padding: 10px 10px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  outline: none;
  font-size: 14px;
}

/* Hide number input spinners */
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

input[type="number"] {
  -moz-appearance: textfield;
  appearance: textfield;
}

input:focus,
select:focus {
  border-color: rgba(11, 94, 168, 0.55);
  box-shadow: 0 0 0 4px rgba(11, 94, 168, 0.12);
}

/* Required field indicator turns red when invalid */
.field.invalid label {
  color: #dc2626;
}

.field.invalid input,
.field.invalid select {
  border-color: #dc2626;
  background: #fffafa;
}

.field.invalid input:focus,
.field.invalid select:focus {
  border-color: #dc2626;
  box-shadow: 0 0 0 4px rgba(220, 38, 38, 0.12);
}

.toggles {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
  user-select: none;
}

.btn {
  cursor: pointer;
  border: 1px solid rgba(11, 94, 168, 0.35);
  background: var(--blue);
  color: #fff;
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 650;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn:hover {
  background: var(--blue2);
}

.btn-ghost {
  background: #fff;
  color: var(--blue2);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  background: #f2f6ff;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
  white-space: nowrap;
  min-width: max-content;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.user-name {
  font-size: 14px;
  font-weight: 500;
  color: #fff;
}

.table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.table th,
.table td {
  text-align: left;
  padding: 10px 10px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.table th {
  background: #fbfcfe;
  color: var(--muted);
  font-weight: 700;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.mono {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", monospace;
  font-size: 13px;
}

.list {
  margin: 0;
  padding-left: 18px;
}

.footer {
  margin-top: 16px;
  color: var(--muted);
  font-size: 12px;
}

.footer-inner {
  padding: 8px 4px;
}

/* Make a full-width field in our 12-col grid */
.field-span-12 {
  grid-column: span 12;
}

.range-row {
  display: flex;
  gap: 14px;
  align-items: center;
}

.range-slider {
  flex: 1 1 auto;
  padding: 8px 2px;
}

/* noUiSlider theme adjustments */
.noUi-target {
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: none;
  border-radius: 999px;
}

.noUi-connect {
  background: var(--blue);
}

.noUi-horizontal {
  height: 10px;
}

.noUi-handle {
  width: 10px;
  height: 20px;
  border-radius: 999px;
  border: 1px solid rgba(11, 94, 168, 0.35);
  box-shadow: 0 6px 18px rgba(18, 27, 38, 0.1);
  background: #373030;

  /* true centering */
  right: -10px;
  /* half of width */
  top: 50%;
  transform: translateY(-50%);
}

.noUi-handle:before,
.noUi-handle:after {
  display: none;
}

.noUi-tooltip {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 6px 8px;
  font-size: 12px;
}

/* Readout boxes on the right */
.range-readout {
  display: flex;
  gap: 10px;
  flex: 0 0 auto;
}

.range-box {
  border: 1px solid var(--line);
  background: #fbfcfe;
  border-radius: 12px;
  padding: 8px 10px;
  min-width: 92px;
}

.range-label {
  font-size: 11px;
  color: var(--muted);
}

.range-value {
  margin-top: 2px;
  font-weight: 700;
}

@media (max-width: 860px) {
  .range-row {
    flex-direction: column;
    align-items: stretch;
  }

  .range-readout {
    justify-content: flex-start;
  }
}

/* Theme Toggle Switch */
.theme-toggle {
  position: relative;
  width: 56px;
  height: 28px;
  flex-shrink: 0;
}

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

.theme-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 28px;
  transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  box-shadow:
    inset 0 2px 4px rgba(0, 0, 0, 0.1),
    0 2px 8px rgba(102, 126, 234, 0.3);
}

.theme-slider:before {
  position: absolute;
  content: "";
  height: 22px;
  width: 22px;
  left: 3px;
  bottom: 3px;
  background: linear-gradient(135deg, #fff 0%, #f0f0f0 100%);
  border-radius: 50%;
  transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.2),
    0 0 0 1px rgba(255, 255, 255, 0.1);
}

.theme-slider:after {
  content: "☀️";
  position: absolute;
  right: 7px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 12px;
  transition: opacity 0.3s ease;
}

.theme-toggle input:checked + .theme-slider {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  box-shadow:
    inset 0 2px 4px rgba(0, 0, 0, 0.3),
    0 2px 8px rgba(26, 26, 46, 0.5);
}

.theme-toggle input:checked + .theme-slider:before {
  transform: translateX(28px);
  background: linear-gradient(135deg, #e0e0e0 0%, #c0c0c0 100%);
}

.theme-toggle input:checked + .theme-slider:after {
  content: "🌙";
  right: auto;
  left: 7px;
}

.theme-toggle:hover .theme-slider {
  box-shadow:
    inset 0 2px 4px rgba(0, 0, 0, 0.1),
    0 4px 16px rgba(102, 126, 234, 0.4);
}

.theme-toggle input:checked:hover + .theme-slider {
  box-shadow:
    inset 0 2px 4px rgba(0, 0, 0, 0.3),
    0 4px 16px rgba(26, 26, 46, 0.6);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-left: auto;
}

/* Two-column grid for spectral / background file dropzones */
.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 4px;
}

@media (max-width: 640px) {
  .upload-grid {
    grid-template-columns: 1fr;
  }
}

/* Upload Section */
.upload-section {
  display: flex;
  gap: 12px;
  align-items: stretch;
  margin-bottom: 16px;
}

.dropzone {
  flex: 1;
  border: 2px dashed var(--line);
  border-radius: 12px;
  padding: 16px 20px;
  cursor: pointer;
  transition: all 0.2s ease;
  background: var(--card);
  display: flex;
  align-items: center;
  gap: 12px;
}

.dropzone:hover {
  border-color: var(--blue);
  background: rgba(11, 94, 168, 0.03);
}

.dropzone.dragover {
  border-color: var(--blue);
  background: rgba(11, 94, 168, 0.08);
  border-style: solid;
}

.dropzone.dropzone-error {
  border-color: #dc2626;
  border-style: solid;
  background: rgba(220, 38, 38, 0.05);
}

.dropzone.has-file {
  border-color: #16a34a;
  border-style: solid;
  background: rgba(22, 163, 74, 0.05);
}

.dropzone-content {
  display: flex;
  align-items: center;
  gap: 12px;
}

.dropzone-icon {
  font-size: 24px;
}

.dropzone-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.dropzone-label {
  font-weight: 600;
  color: var(--text);
}

.dropzone-hint {
  font-size: 12px;
  color: var(--muted);
}

.dropzone-filename {
  margin-left: auto;
  padding: 6px 12px;
  background: rgba(22, 163, 74, 0.1);
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  color: #16a34a;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.btn-clear {
  padding: 12px 16px;
  font-size: 18px;
  line-height: 1;
  background: #fff;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 12px;
  flex-shrink: 0;
}

.btn-clear:hover {
  background: #fef2f2;
  color: #dc2626;
  border-color: #fecaca;
}

.dropzone.validating {
  pointer-events: none;
  position: relative;
  overflow: hidden;
  cursor: progress;
  border-style: solid;
  border-color: var(--blue);
}

.dropzone.validating::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 30%;
  background: linear-gradient(90deg, var(--blue), var(--blue2));
  animation: progress-slide 1.2s ease-in-out infinite;
}

@keyframes progress-slide {
  0% {
    left: -30%;
  }
  100% {
    left: 100%;
  }
}

.upload-message {
  padding: 12px 16px;
  border-radius: 10px;
  margin-bottom: 16px;
  font-size: 14px;
  white-space: pre-wrap;
}

.upload-message.success {
  background: rgba(22, 163, 74, 0.1);
  border: 1px solid rgba(22, 163, 74, 0.3);
  color: #16a34a;
}

.upload-message.error {
  background: rgba(220, 38, 38, 0.1);
  border: 1px solid rgba(220, 38, 38, 0.3);
  color: #dc2626;
}

@media (max-width: 640px) {
  .upload-section {
    flex-direction: column;
  }
}

/* Flatpickr Customizations */
.flatpickr-calendar {
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 8px 22px rgba(18, 27, 38, 0.12);
  font-family: inherit;
}

.flatpickr-months {
  position: relative;
  padding: 8px 4px;
}

.flatpickr-months .flatpickr-month {
  height: 34px;
}

.flatpickr-current-month {
  padding: 0;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
}

.flatpickr-current-month .flatpickr-monthDropdown-months {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  cursor: default;
}

.flatpickr-year-display {
  font-weight: 600;
  font-size: 14px;
  color: var(--text);
  margin-left: 4px;
}

/* Year navigation arrows */
.flatpickr-year-prev,
.flatpickr-year-next {
  position: absolute;
  top: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  cursor: pointer;
  font-size: 18px;
  font-weight: bold;
  color: var(--muted);
  border-radius: 6px;
  transition: all 0.15s ease;
  user-select: none;
  z-index: 10;
}

.flatpickr-year-prev:hover,
.flatpickr-year-next:hover {
  background: rgba(11, 94, 168, 0.1);
}

.flatpickr-year-prev svg,
.flatpickr-year-next svg {
  color: var(--muted);
}

.flatpickr-year-prev:hover svg,
.flatpickr-year-next:hover svg {
  color: var(--blue);
}

.flatpickr-year-prev {
  left: 3px;
}

.flatpickr-year-next {
  right: 3px;
}

/* Adjust month arrows to make room for year arrows */
.flatpickr-prev-month,
.flatpickr-next-month {
  position: absolute !important;
  top: 5px !important;
  padding: 0 !important;
  width: 28px !important;
  height: 28px !important;
  display: flex !important;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: all 0.15s ease;
  z-index: 10;
}

.flatpickr-prev-month {
  left: 32px !important;
}

.flatpickr-next-month {
  right: 32px !important;
}

.flatpickr-prev-month:hover,
.flatpickr-next-month:hover {
  background: rgba(11, 94, 168, 0.1);
}

.flatpickr-prev-month svg,
.flatpickr-next-month svg {
  fill: var(--muted);
}

.flatpickr-prev-month:hover svg,
.flatpickr-next-month:hover svg {
  fill: var(--blue);
}

/* Days styling */
.flatpickr-day {
  border-radius: 8px;
  color: var(--text);
  font-size: 13px;
}

.flatpickr-day:hover {
  background: rgba(11, 94, 168, 0.1);
  border-color: transparent;
}

.flatpickr-day.selected {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

.flatpickr-day.selected:hover {
  background: var(--blue2);
  border-color: var(--blue2);
}

.flatpickr-day.today {
  border-color: var(--blue);
}

.flatpickr-day.today:hover {
  background: rgba(11, 94, 168, 0.1);
  color: var(--text);
}

.flatpickr-weekday {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
}

/* Upload progress overlay */
#upload-progress-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20, 30, 48, 0.55);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

#upload-progress-overlay[hidden] {
  display: none;
}

.upload-progress-box {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 32px 40px;
  min-width: 340px;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.18);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.upload-progress-label {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.upload-progress-track {
  width: 100%;
  height: 10px;
  background: var(--line);
  border-radius: 999px;
  overflow: hidden;
}

.upload-progress-bar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--blue), var(--blue2));
  border-radius: 999px;
  transition: width 0.15s ease;
}

.upload-progress-pct {
  font-size: 13px;
  color: var(--muted);
  text-align: right;
}

.tag {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 11px;
  background: var(--border);
  color: var(--muted);
  vertical-align: middle;
}

.muted {
  color: var(--muted);
}

.site-footer {
  padding: 12px 0;
  font-size: 12px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  margin-top: 24px;
}

/* ── Field tooltips ──────────────────────────────────────────── */
label[data-tooltip] {
  position: relative;
  cursor: help;
  text-decoration: underline dotted rgba(102, 112, 133, 0.5);
  text-underline-offset: 3px;
}

label[data-tooltip]::after {
  content: attr(data-tooltip);
  display: none;
  position: absolute;
  bottom: calc(100% + 6px);
  left: 0;
  background: #1c2430;
  color: #f0f4f8;
  font-size: 12px;
  line-height: 1.45;
  padding: 7px 10px;
  border-radius: 8px;
  white-space: normal;
  width: 260px;
  max-width: 80vw;
  z-index: 200;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.22);
  pointer-events: none;
  font-weight: 400;
  text-decoration: none;
}

label[data-tooltip]:hover::after {
  display: block;
}

/* ── Dynamic section rows ────────────────────────────────────── */
.dynamic-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  grid-column: span 12;
  padding: 4px 0 2px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2px;
}

.dynamic-section-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--blue2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.dynamic-row {
  display: contents;
}

.btn-remove-row {
  font-size: 12px;
  padding: 3px 9px;
  border-radius: 8px;
  background: #fff;
  color: #dc2626;
  border: 1px solid #fecaca;
  cursor: pointer;
  line-height: 1.4;
}

.btn-remove-row:hover {
  background: #fef2f2;
  border-color: #dc2626;
}

.btn-add-row {
  grid-column: span 12;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  padding: 7px 14px;
  border-radius: 10px;
  background: var(--card);
  color: var(--blue2);
  border: 1px dashed rgba(11, 94, 168, 0.4);
  cursor: pointer;
  width: fit-content;
  margin-top: 4px;
}

.btn-add-row:hover {
  background: rgba(11, 94, 168, 0.05);
  border-color: var(--blue);
}

.section-hint {
  grid-column: span 12;
  font-size: 12px;
  color: var(--muted);
  padding: 2px 0 6px;
  font-style: italic;
}

.dead-time-hint {
  font-size: 11px;
  color: #dc2626;
  margin-top: 2px;
  display: none;
}

.dead-time-hint.visible {
  display: block;
}