:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e5e7eb;
  --panel: #ffffff;
  --primary: #1e3a8a;
  --primary-hover: #1d4ed8;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --blue: #2563eb;
  --orange: #f97316;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.08), transparent 32rem),
    linear-gradient(180deg, #ffffff 0, var(--bg) 24rem);
  color: var(--ink);
}

.app-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 48px;
}

.hero-panel,
.step-panel,
.workspace {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
}

.hero-panel {
  padding: 30px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: flex-start;
}

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

h1 {
  font-size: clamp(30px, 4vw, 44px);
  letter-spacing: 0;
  color: var(--primary);
}

h2 {
  font-size: 24px;
  letter-spacing: 0;
}

h3 {
  font-size: 18px;
}

p {
  color: var(--muted);
  line-height: 1.7;
}

.trust-row,
.hint-badges {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.trust-row span,
.hint-badges span {
  border: 1px solid #dbe4f0;
  background: #f8fafc;
  color: var(--primary);
  border-radius: 999px;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
}

.step-panel {
  margin-top: 16px;
  padding: 20px 28px;
  display: grid;
  grid-template-columns: max-content 1fr max-content 1fr max-content;
  align-items: center;
  gap: 16px;
}

.flow-step {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-weight: 700;
  white-space: nowrap;
}

.flow-step b {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #eef2ff;
  color: var(--primary);
}

.flow-step.is-active b {
  background: var(--primary);
  color: white;
}

.flow-line {
  height: 2px;
  background: linear-gradient(90deg, #cbd5e1, transparent);
}

.workspace {
  margin-top: 16px;
  padding: 24px;
}

.workspace-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
  margin-bottom: 20px;
}

.status-pill {
  flex: 0 0 auto;
  border: 1px solid #fde68a;
  border-radius: 999px;
  padding: 8px 14px;
  color: #92400e;
  background: #fffbeb;
  font-size: 14px;
  max-width: 520px;
  overflow-wrap: anywhere;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.drop-zone,
.panel,
.preview-panel,
.hint-panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.05);
}

.drop-zone {
  min-height: 190px;
  padding: 24px;
  display: grid;
  align-content: center;
  gap: 10px;
  cursor: pointer;
  position: relative;
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.drop-zone:hover,
.drop-zone.is-dragging {
  transform: translateY(-2px);
  border-color: var(--primary-hover);
  box-shadow: 0 10px 30px rgba(30, 58, 138, 0.12);
}

.drop-zone.has-file {
  border-color: rgba(16, 185, 129, 0.55);
  background: linear-gradient(180deg, #ffffff, #f0fdf4);
}

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

.upload-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  color: white;
  font-weight: 800;
  font-size: 22px;
}

.word-icon {
  background: var(--blue);
}

.ppt-icon {
  background: var(--orange);
}

.label,
legend {
  color: var(--muted);
  font-size: 14px;
}

.drop-zone strong {
  font-size: 24px;
  color: var(--ink);
}

.drop-zone small {
  color: var(--muted);
  font-size: 14px;
  overflow-wrap: anywhere;
}

.drop-zone.has-file small {
  color: var(--success);
  font-weight: 700;
}

.panel,
.preview-panel,
.hint-panel {
  margin: 0;
  padding: 20px;
}

.wide-panel {
  grid-column: 1 / -1;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 10px;
}

.segmented label,
.toggle-line {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #f8fafc;
}

.toggle-line {
  justify-content: flex-start;
  padding: 0 14px;
  margin: 10px 0 12px;
  color: var(--primary);
  font-weight: 700;
}

.control-row,
.coordinates {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.coordinates {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.control-row label,
.coordinates label {
  display: grid;
  gap: 6px;
  color: var(--muted);
  font-size: 14px;
}

input[type="number"],
input[type="text"],
input[type="color"],
select {
  width: 100%;
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 9px 12px;
  background: white;
  color: var(--ink);
  font: inherit;
}

input[type="color"] {
  padding: 4px;
}

.preview-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  margin-bottom: 14px;
}

.preview-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 16px;
  align-items: start;
}

.preview-stage {
  position: relative;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #edf1f7;
}

.preview-stage img {
  display: block;
  width: 100%;
  height: auto;
}

.preview-box {
  position: absolute;
  display: grid;
  place-items: center;
  border: 3px solid var(--danger);
  background: rgba(239, 68, 68, 0.16);
  color: #fff200;
  font-weight: 800;
  text-shadow: 0 1px 2px #000;
  pointer-events: none;
}

.preview-box.is-vertical span {
  writing-mode: vertical-rl;
}

.result-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #f8fafc;
  padding: 16px;
}

.result-card h3 {
  margin-bottom: 12px;
  color: var(--primary);
}

.result-card dl {
  display: grid;
  gap: 8px;
  margin: 0;
}

.result-card dl div {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  border-bottom: 1px solid #e2e8f0;
  padding-bottom: 8px;
}

.result-card dt {
  color: var(--muted);
}

.result-card dd {
  margin: 0;
  font-weight: 800;
  color: var(--ink);
}

.privacy-note {
  margin-top: 12px;
  color: var(--success);
  font-weight: 700;
}

.hint-panel {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
}

.action-row {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(180px, 260px) 1fr;
  gap: 12px;
}

.primary-button,
.secondary-button {
  min-height: 52px;
  border-radius: 12px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.16s ease, background 0.16s ease, box-shadow 0.16s ease;
}

.primary-button {
  border: 0;
  background: var(--accent);
  color: white;
  font-size: 16px;
  box-shadow: 0 12px 24px rgba(245, 158, 11, 0.25);
}

.primary-button:hover {
  background: #d97706;
  transform: translateY(-1px);
}

.secondary-button {
  border: 1px solid #cbd5e1;
  background: var(--primary);
  color: white;
}

.secondary-button:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.preview-head .secondary-button {
  min-height: 42px;
  padding: 0 14px;
  background: white;
  color: var(--primary);
}

.primary-button:disabled,
.secondary-button:disabled {
  cursor: wait;
  opacity: 0.72;
  transform: none;
}

@media (max-width: 860px) {
  .hero-panel,
  .workspace-head,
  .hint-panel,
  .preview-head {
    display: grid;
  }

  .tool-grid,
  .control-row,
  .coordinates,
  .action-row,
  .preview-grid {
    grid-template-columns: 1fr;
  }

  .step-panel {
    grid-template-columns: 1fr;
  }

  .flow-line {
    height: 16px;
    width: 2px;
    margin-left: 16px;
  }

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