:root {
  --bg: #fbfbfd;
  --ink: #1d1d1f;
  --ink-strong: #111827;
  --muted: #6e6e73;
  --muted-2: #8a8a90;
  --line: #d2d2d7;
  --line-soft: rgba(15, 23, 42, 0.08);
  --accent: #0071e3;
  --accent-strong: #005bbd;
  --brand: #f1636b;
  --rose-soft: rgba(241, 99, 107, 0.08);
  --blue-soft: #e7f2ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-soft: rgba(255, 255, 255, 0.64);
  --shadow-card: 0 24px 60px -34px rgba(0, 0, 0, 0.32);
  --shadow-hover: 0 30px 70px -42px rgba(0, 0, 0, 0.34);
  font-family:
    "SF Pro Display",
    "SF Pro Text",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(1200px 560px at 50% -12%, #f2f6ff 0%, rgba(242, 246, 255, 0) 62%),
    linear-gradient(180deg, #fff 0%, var(--bg) 42%, #f7f8fb 100%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  letter-spacing: 0;
}

button,
input {
  font: inherit;
}

button {
  border: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  color: var(--ink);
  letter-spacing: 0;
}

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

.app-shell {
  width: 95%;
  margin: 0 auto;
  padding: 2rem 0 2.5rem;
}

.tool-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: end;
  gap: 1.5rem;
  margin-bottom: 1.1rem;
  padding: 1.25rem 0.25rem 0.4rem;
}

.eyebrow,
.panel-kicker {
  display: block;
  margin-bottom: 0.42rem;
  color: var(--brand);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-copy h1 {
  margin-bottom: 0.55rem;
  font-size: clamp(1.9rem, 3.2vw, 3.7rem);
  font-weight: 760;
  line-height: 1.06;
}

.hero-copy p {
  max-width: 760px;
  margin-bottom: 0;
  color: #5f6368;
  font-size: 0.98rem;
  line-height: 1.65;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(5.5rem, 1fr));
  gap: 0.55rem;
}

.metric {
  min-width: 5.5rem;
  padding: 0.72rem 0.82rem;
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 18px 45px -35px rgba(0, 0, 0, 0.32);
}

.metric strong {
  display: block;
  color: var(--ink);
  font-size: 1.24rem;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.metric span {
  display: block;
  margin-top: 0.18rem;
  color: var(--muted);
  font-size: 0.72rem;
}

.tool-panel {
  overflow: hidden;
  border: 1px solid rgba(0, 0, 0, 0.05);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.62);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.95) inset,
    0 30px 70px -48px rgba(0, 0, 0, 0.38);
  backdrop-filter: saturate(180%) blur(22px);
  -webkit-backdrop-filter: saturate(180%) blur(22px);
}

.workflow-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.58);
}

.step-list,
.workflow-status {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.step-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 2.2rem;
  padding: 0 0.8rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 999px;
  color: #515154;
  background: rgba(255, 255, 255, 0.86);
  cursor: default;
  font-size: 0.82rem;
  font-weight: 700;
  transition:
    border-color 0.25s ease,
    background-color 0.25s ease,
    color 0.25s ease;
}

.step-pill span {
  color: var(--muted-2);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
}

.step-pill.active {
  color: var(--accent);
  border-color: #b8d8ff;
  background: var(--blue-soft);
}

.step-pill.active span {
  color: var(--accent);
}

.workflow-status {
  justify-content: flex-end;
}

.workflow-status span,
.clear-button {
  display: inline-flex;
  align-items: center;
  min-height: 1.75rem;
  padding: 0 0.62rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 999px;
  color: #52525b;
  background: rgba(248, 250, 252, 0.92);
  font-size: 0.76rem;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

.clear-button {
  color: #b42318;
  border-color: rgba(244, 63, 94, 0.14);
  background: rgba(244, 63, 94, 0.07);
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    color 0.2s ease,
    transform 0.15s ease;
}

.clear-button:hover {
  color: #981b1b;
  background: rgba(244, 63, 94, 0.12);
}

.clear-button:active {
  transform: scale(0.97);
}

.workspace-grid {
  display: grid;
  grid-template-columns: minmax(320px, 420px) minmax(0, 1fr) minmax(210px, 260px);
  gap: 0.8rem;
  padding: 0.8rem;
}

.panel {
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-card);
  transition:
    transform 0.45s cubic-bezier(0.22, 0.61, 0.36, 1),
    box-shadow 0.45s ease;
}

.panel:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.input-panel,
.export-panel {
  padding: 0.95rem;
}

.input-panel {
  min-width: 0;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: calc(100vh - 19rem);
  overflow: hidden;
}

.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.85rem;
}

.preview-head {
  flex-shrink: 0;
  margin-bottom: 0;
  padding: 0.95rem 1rem;
  border-bottom: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.74);
}

.panel-head h2 {
  margin-bottom: 0.2rem;
  font-size: 1rem;
  font-weight: 760;
  line-height: 1.25;
}

.panel-note {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.45;
}

.soft-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 1.55rem;
  padding: 0.1rem 0.52rem;
  border: 1px solid rgba(241, 99, 107, 0.18);
  border-radius: 999px;
  color: #bf3f48;
  background: var(--rose-soft);
  font-size: 0.7rem;
  font-weight: 760;
}

.soft-badge.is-blue {
  color: #0b63c2;
  border-color: #b8d8ff;
  background: var(--blue-soft);
}

.drop-zone {
  display: grid;
  grid-template-columns: 2.9rem minmax(0, 1fr);
  align-items: center;
  gap: 0.78rem;
  min-height: 6.7rem;
  margin-bottom: 0.85rem;
  padding: 0.82rem;
  border: 1px dashed rgba(0, 113, 227, 0.38);
  border-radius: 16px;
  background: rgba(246, 250, 255, 0.72);
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.drop-zone input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}

.drop-zone:hover,
.drop-zone.is-dragover {
  border-color: rgba(0, 113, 227, 0.72);
  background: rgba(231, 242, 255, 0.86);
  box-shadow: 0 18px 36px -28px rgba(0, 113, 227, 0.4);
  transform: translateY(-1px);
}

.drop-icon {
  display: grid;
  align-content: center;
  gap: 0.24rem;
  width: 2.9rem;
  height: 2.9rem;
  padding: 0.66rem;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), #3b82f6);
  box-shadow: 0 18px 28px -20px rgba(0, 113, 227, 0.72);
}

.drop-icon span {
  display: block;
  height: 3px;
  border-radius: 999px;
  background: #fff;
}

.drop-icon span:nth-child(2) {
  width: 78%;
}

.drop-icon span:nth-child(3) {
  width: 58%;
}

.drop-copy {
  display: grid;
  min-width: 0;
  gap: 0.2rem;
}

.drop-copy strong {
  color: var(--ink);
  font-size: 0.88rem;
  line-height: 1.25;
}

.drop-copy small {
  color: var(--muted);
  font-size: 0.73rem;
  line-height: 1.4;
}

.settings-card {
  display: grid;
  gap: 0.85rem;
  margin-bottom: 0.85rem;
  padding: 0.82rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.68);
}

.settings-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.settings-head h3 {
  margin-bottom: 0;
  font-size: 0.9rem;
  font-weight: 760;
}

.settings-section {
  display: grid;
  gap: 0.62rem;
  margin: 0;
  padding: 0.72rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 14px;
  background: rgba(248, 250, 252, 0.72);
}

.settings-section legend {
  padding: 0 0.28rem;
  color: #475467;
  font-size: 0.74rem;
  font-weight: 760;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.38rem;
}

.check-line {
  display: flex;
  align-items: center;
  gap: 0.42rem;
  min-width: 0;
  color: #3f3f46;
  font-size: 0.76rem;
  font-weight: 650;
  line-height: 1.35;
}

.check-line input {
  flex: 0 0 auto;
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--accent);
}

.settings-grid {
  display: grid;
  grid-template-columns: minmax(4.6rem, 0.72fr) minmax(0, 1.28fr);
  gap: 0.5rem;
}

.range-grid {
  grid-template-columns: minmax(4.6rem, 0.72fr) minmax(0, 1.28fr);
}

.range-grid .field-wide {
  grid-column: 1 / -1;
}

.range-grid .range-line-field {
  grid-column: 1 / -1;
}

.field {
  display: grid;
  gap: 0.3rem;
  min-width: 0;
}

.field-wide {
  grid-column: span 1;
}

.field span {
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 650;
}

.field input {
  width: 100%;
  min-height: 2rem;
  padding: 0.42rem 0.55rem;
  border: 1px solid rgba(15, 23, 42, 0.11);
  border-radius: 10px;
  color: var(--ink-strong);
  background: rgba(255, 255, 255, 0.88);
  font-size: 0.78rem;
  outline: none;
  transition:
    border-color 0.18s ease,
    box-shadow 0.18s ease,
    background-color 0.18s ease;
}

.field input:focus {
  border-color: #8ec5ff;
  background: #fff;
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.range-choice-list {
  display: grid;
  gap: 0.38rem;
  width: 100%;
  max-height: none;
  overflow: visible;
  padding: 0.38rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 12px;
  background: rgba(248, 250, 252, 0.72);
}

.range-choice-note {
  color: #b42318;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.35;
}

.range-choice {
  display: block;
  width: 100%;
  min-height: 2rem;
  height: auto;
  padding: 0.42rem 0.52rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 10px;
  color: #3f3f46;
  background: rgba(255, 255, 255, 0.86);
  cursor: pointer;
  font-size: 0.74rem;
  font-weight: 650;
  line-height: 1.35;
  text-align: left;
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: break-word;
  transition:
    border-color 0.18s ease,
    background-color 0.18s ease,
    color 0.18s ease;
}

.range-choice:hover {
  background: #fff;
}

.range-choice.is-selected {
  color: var(--accent);
  border-color: #b8d8ff;
  background: var(--blue-soft);
}

.file-list {
  display: grid;
  gap: 0.45rem;
  max-height: none;
  overflow: auto;
  padding-right: 0.12rem;
}

.file-empty {
  display: grid;
  place-items: center;
  min-height: 2.6rem;
  border: 1px dashed rgba(15, 23, 42, 0.12);
  border-radius: 14px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.56);
  font-size: 0.78rem;
}

.file-row {
  display: grid;
  grid-template-columns: 2.15rem minmax(0, 1fr) 1.72rem;
  align-items: center;
  gap: 0.55rem;
  width: 100%;
  min-height: 3.35rem;
  padding: 0.45rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 14px;
  color: inherit;
  background: rgba(255, 255, 255, 0.78);
  text-align: left;
  cursor: pointer;
  transition:
    background-color 0.18s ease,
    border-color 0.18s ease,
    transform 0.18s ease;
}

.file-row:hover {
  transform: translateY(-1px);
  background: #fff;
}

.file-row.is-active {
  border-color: #b8d8ff;
  background: var(--blue-soft);
}

.file-badge {
  display: grid;
  place-items: center;
  width: 2.15rem;
  height: 2.15rem;
  border: 1px solid rgba(0, 113, 227, 0.2);
  border-radius: 12px;
  color: #0b63c2;
  background: #f2f8ff;
  font-size: 0.56rem;
  font-weight: 800;
  text-transform: uppercase;
}

.file-name {
  display: block;
  overflow: hidden;
  margin-bottom: 0.16rem;
  color: var(--ink-strong);
  font-size: 0.78rem;
  font-weight: 740;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-meta {
  display: block;
  overflow: hidden;
  color: var(--muted);
  font-size: 0.7rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.remove-button {
  display: grid;
  place-items: center;
  width: 1.72rem;
  height: 1.72rem;
  border-radius: 999px;
  color: #9ca3af;
  background: transparent;
  cursor: pointer;
  font-size: 1.05rem;
  line-height: 1;
  transition:
    color 0.15s ease,
    background-color 0.15s ease;
}

.remove-button:hover {
  color: #e11d48;
  background: rgba(244, 63, 94, 0.08);
}

.stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 0.45rem;
}

.stats span {
  display: inline-flex;
  align-items: center;
  min-height: 1.65rem;
  padding: 0.12rem 0.52rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 999px;
  color: #334155;
  background: #eef2f7;
  font-size: 0.72rem;
  font-weight: 720;
  font-variant-numeric: tabular-nums;
}

.stats span:first-child {
  color: #0b63c2;
  border-color: #b8d8ff;
  background: var(--blue-soft);
}

.preview-area {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
  background:
    linear-gradient(rgba(255, 255, 255, 0.7), rgba(255, 255, 255, 0.7)),
    linear-gradient(90deg, rgba(15, 23, 42, 0.035) 1px, transparent 1px),
    linear-gradient(180deg, rgba(15, 23, 42, 0.035) 1px, transparent 1px);
  background-size: auto, 36px 36px, 36px 36px;
}

.sheet-tabs {
  display: flex;
  flex: 0 0 auto;
  flex-wrap: wrap;
  gap: 0.42rem;
  padding: 0.62rem 0.72rem;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.sheet-tab {
  display: inline-flex;
  align-items: center;
  max-width: min(24rem, 100%);
  min-height: 1.95rem;
  padding: 0.28rem 0.62rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 999px;
  color: #475467;
  background: rgba(248, 250, 252, 0.92);
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 720;
  line-height: 1.25;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  transition:
    background-color 0.18s ease,
    border-color 0.18s ease,
    color 0.18s ease;
}

.sheet-tab:hover {
  background: #fff;
}

.sheet-tab.is-active {
  color: var(--accent);
  border-color: #b8d8ff;
  background: var(--blue-soft);
}

.preview-scroll-top {
  flex: 0 0 auto;
  height: 14px;
  overflow-x: auto;
  overflow-y: hidden;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(248, 250, 252, 0.82);
}

.preview-scroll-top > div {
  height: 1px;
}

.preview-table-wrap {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
}

.empty-state {
  display: grid;
  place-items: center;
  align-content: center;
  min-height: 100%;
  padding: 2rem;
  text-align: center;
}

.empty-state h3 {
  margin: 0.9rem 0 0.3rem;
  font-size: 1.02rem;
  font-weight: 760;
}

.empty-state p {
  margin: 0;
  font-size: 0.84rem;
}

.empty-mark {
  display: grid;
  align-content: center;
  gap: 0.28rem;
  width: 4.1rem;
  height: 4.1rem;
  padding: 0.95rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 18px 42px -34px rgba(0, 0, 0, 0.36);
}

.empty-mark span {
  display: block;
  height: 0.34rem;
  border-radius: 999px;
  background: #dbeafe;
}

.empty-mark span:first-child {
  width: 75%;
  background: #b8d8ff;
}

.empty-mark span:last-child {
  width: 55%;
  background: #ffe1e5;
}

.sheet-preview {
  min-width: 0;
  border-collapse: separate;
  border-spacing: 0;
  table-layout: fixed;
  background: rgba(255, 255, 255, 0.94);
  font-size: 0.78rem;
}

.sheet-preview th,
.sheet-preview td {
  height: 2.05rem;
  padding: 0.38rem 0.5rem;
  overflow: hidden;
  color: var(--ink-strong);
  border-right: 1px solid rgba(15, 23, 42, 0.08);
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  text-overflow: ellipsis;
  white-space: pre;
}

.sheet-preview th {
  position: sticky;
  top: 0;
  z-index: 1;
  color: #475467;
  background: rgba(248, 250, 252, 0.96);
  font-weight: 760;
}

.sheet-preview th:first-child {
  left: 0;
  z-index: 2;
  text-align: center;
}

.sheet-preview td:first-child {
  position: sticky;
  left: 0;
  color: #475467;
  background: rgba(248, 250, 252, 0.96);
  text-align: center;
  font-weight: 760;
  font-variant-numeric: tabular-nums;
}

.sheet-preview tr:hover td:not(:first-child) {
  background: rgba(0, 113, 227, 0.045);
}

.status-line {
  position: sticky;
  bottom: 0;
  padding: 0.68rem 0.9rem;
  color: var(--muted);
  border-top: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  font-size: 0.78rem;
}

.export-panel {
  display: flex;
  flex-direction: column;
  min-height: 22rem;
}

.export-summary {
  display: grid;
  gap: 0.55rem;
  margin-bottom: 0.85rem;
}

.export-summary div {
  display: grid;
  gap: 0.18rem;
  padding: 0.68rem 0.72rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.78);
}

.export-summary span {
  color: var(--muted);
  font-size: 0.72rem;
}

.export-summary strong {
  overflow-wrap: anywhere;
  color: var(--ink-strong);
  font-size: 0.92rem;
  font-weight: 760;
}

.export-mode {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 0.85rem;
  padding: 0.62rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 14px;
  background: rgba(248, 250, 252, 0.72);
}

.radio-line {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 1.85rem;
  color: #3f3f46;
  font-size: 0.78rem;
  font-weight: 650;
  line-height: 1.35;
}

.radio-line input {
  flex: 0 0 auto;
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--accent);
}

.merge-tools {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 0.85rem;
  padding: 0.62rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
}

.merge-status {
  margin: 0;
  color: var(--muted);
  font-size: 0.73rem;
  line-height: 1.45;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 2.34rem;
  margin-top: 0.45rem;
  padding: 0.62rem 0.95rem;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 760;
  white-space: nowrap;
  transition:
    background-color 0.2s ease,
    border-color 0.2s ease,
    box-shadow 0.2s ease,
    color 0.2s ease,
    transform 0.15s ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
}

.btn:active:not(:disabled) {
  transform: scale(0.98);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.btn-primary {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 18px 34px -24px rgba(0, 113, 227, 0.82);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-strong);
}

.btn-secondary {
  color: #1d1d1f;
  border-color: rgba(15, 23, 42, 0.1);
  background: rgba(255, 255, 255, 0.84);
}

.btn-secondary:hover:not(:disabled) {
  background: #fff;
}

.btn-compact {
  min-height: 2rem;
  margin-top: 0;
  font-size: 0.78rem;
}

.export-note {
  margin: auto 0 0;
  padding-top: 0.85rem;
  color: var(--muted);
  border-top: 1px solid rgba(15, 23, 42, 0.08);
  font-size: 0.76rem;
  line-height: 1.5;
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-thumb {
  border: 2px solid rgba(255, 255, 255, 0.74);
  border-radius: 999px;
  background: rgba(100, 116, 139, 0.42);
}

::-webkit-scrollbar-track {
  background: rgba(248, 250, 252, 0.8);
}

@media (max-width: 1180px) {
  .tool-hero {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .hero-metrics {
    width: min(100%, 520px);
  }

  .workspace-grid {
    grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  }

  .export-panel {
    grid-column: 1 / -1;
    min-height: auto;
  }

  .export-summary {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .app-shell {
    width: 95%;
  }

  .tool-hero {
    padding-top: 1rem;
  }

  .hero-copy h1 {
    font-size: clamp(1.75rem, 9vw, 2.55rem);
  }

  .hero-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .metric {
    min-width: 0;
    padding: 0.68rem;
  }

  .workflow-bar {
    align-items: flex-start;
    flex-direction: column;
  }

  .workflow-status {
    justify-content: flex-start;
  }

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

  .preview-panel {
    min-height: 34rem;
  }

  .file-list {
    max-height: none;
  }

  .export-summary {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .app-shell {
    padding-top: 1rem;
  }

  .tool-panel {
    border-radius: 20px;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }

  .metric {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 0.6rem;
  }

  .workflow-bar,
  .workspace-grid {
    padding: 0.62rem;
  }

  .step-list {
    width: 100%;
  }

  .step-pill {
    flex: 1 1 100%;
    justify-content: center;
  }

  .drop-zone {
    grid-template-columns: 1fr;
    justify-items: start;
  }

  .check-grid,
  .settings-grid {
    grid-template-columns: 1fr;
  }

  .range-grid .field-wide {
    grid-column: auto;
  }

  .preview-head {
    flex-direction: column;
  }

  .stats {
    justify-content: flex-start;
  }

  .preview-table-wrap {
    -webkit-overflow-scrolling: touch;
  }
}