:root {
  color-scheme: light;
  --ink: #17213b;
  --muted: #68718a;
  --line: #dce2ed;
  --surface: rgba(255, 255, 255, 0.94);
  --surface-strong: #ffffff;
  --navy: #111b36;
  --blue: #2868dc;
  --blue-dark: #174eae;
  --gold: #dca738;
  --green: #16865f;
  --danger: #b63b4d;
  --shadow: 0 18px 50px rgba(27, 40, 75, 0.1);
  --radius: 22px;
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background: #eef2f8;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 7% 2%, rgba(40, 104, 220, 0.12), transparent 30rem),
    radial-gradient(circle at 95% 14%, rgba(220, 167, 56, 0.14), transparent 26rem),
    linear-gradient(180deg, #f7f9fc 0, #eef2f8 70%);
}

button, input, select, textarea { font: inherit; }
button { touch-action: manipulation; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 78px;
  padding: 12px max(20px, env(safe-area-inset-left)) 12px max(20px, env(safe-area-inset-right));
  color: white;
  background: rgba(17, 27, 54, 0.96);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(16px);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand img { border-radius: 13px; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.24); }
.brand h1 { margin: 2px 0 0; font-size: clamp(1.15rem, 3vw, 1.45rem); letter-spacing: 0.02em; }
main {
  width: min(1040px, calc(100% - 32px));
  margin: 30px auto 60px;
}

section { scroll-margin-top: 96px; }

.hero-card, .form-card, .output-card, .utility-card {
  background: var(--surface);
  border: 1px solid rgba(208, 216, 231, 0.9);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card, .form-card, .output-card { padding: clamp(20px, 4vw, 34px); margin-bottom: 22px; }

h2 { margin: 4px 0 6px; font-size: clamp(1.35rem, 4vw, 1.8rem); letter-spacing: -0.02em; }
p { line-height: 1.6; }
.hero-card > div > p:last-child, .section-heading p, .utility-content p { margin: 0; color: var(--muted); font-size: 0.92rem; }
.step-label { margin: 0; color: var(--blue); font-size: 0.76rem; font-weight: 800; letter-spacing: 0.12em; }
.source-title-row { display: flex; align-items: baseline; flex-wrap: wrap; gap: 5px 8px; }
.source-title-row h2 { margin: 5px 0 0; font-size: 0.92rem; letter-spacing: 0; }
.source-title-row p { margin: 0; color: var(--muted); font-size: 0.82rem; }

.source-actions, .primary-row, .copy-actions, .inline-control {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.source-actions { margin: 20px 0 10px; }

textarea, input, select {
  width: 100%;
  color: var(--ink);
  background: #fbfcff;
  border: 1px solid #cdd5e3;
  border-radius: 12px;
  outline: none;
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}
textarea:focus, input:focus, select:focus {
  background: white;
  border-color: var(--blue);
  box-shadow: 0 0 0 4px rgba(40, 104, 220, 0.12);
}
textarea { min-height: 230px; padding: 15px 16px; line-height: 1.7; resize: vertical; }
input, select { min-height: 46px; padding: 10px 12px; }

.button {
  min-height: 44px;
  padding: 10px 16px;
  font-weight: 750;
  color: var(--ink);
  background: white;
  border: 1px solid transparent;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 160ms ease, background 160ms ease;
}
.button:active { transform: translateY(1px) scale(0.99); }
.button:focus-visible { outline: 3px solid rgba(40, 104, 220, 0.25); outline-offset: 2px; }
.button-primary, .button-copy { color: white; background: var(--blue); box-shadow: 0 10px 24px rgba(40, 104, 220, 0.24); }
.button-primary:hover, .button-copy:hover { background: var(--blue-dark); }
.button-primary { min-width: 150px; }
.button-copy { min-height: 54px; flex: 1 1 260px; font-size: 1rem; }
.button-secondary { min-height: 54px; color: #4d3709; background: #f2d68c; border-color: #e3c067; }
.button-quiet { background: #edf3ff; border-color: #d7e3fa; color: #1d55b5; }
.button-ghost { background: transparent; border-color: var(--line); color: var(--muted); }
.button[disabled] { opacity: 0.55; cursor: not-allowed; box-shadow: none; }

.primary-row { margin-top: 14px; }
.inline-status { margin: 0; color: var(--muted); font-size: 0.88rem; }
.inline-status.success, .copy-status.success { color: var(--green); font-weight: 700; }
.inline-status.warning, .copy-status.warning { color: #a96c00; font-weight: 700; }
.inline-status.error, .copy-status.error { color: var(--danger); font-weight: 700; }

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}
.section-heading.compact { align-items: flex-start; }

.field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 17px 18px;
  margin-top: 22px;
}
.field { display: block; min-width: 0; }
.field > span { display: block; margin: 0 0 7px 2px; color: #4e5871; font-size: 0.82rem; font-weight: 750; }
.field-wide { grid-column: 1 / -1; }

.row-picker {
  display: grid;
  grid-template-columns: minmax(160px, 280px) 1fr;
  align-items: end;
  gap: 18px;
  margin: 22px 0 18px;
}
.range-preview {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 46px;
  padding: 11px 15px;
  color: var(--muted);
  background: #f2f5fa;
  border: 1px solid var(--line);
  border-radius: 12px;
}
.range-preview strong { color: var(--navy); font-size: 1.1rem; }
.copy-actions { align-items: stretch; }
.copy-status { min-height: 26px; margin: 12px 2px 0; color: var(--muted); font-size: 0.9rem; }
.record-notice { margin: 2px 2px 0; color: #8a5b00; font-size: 0.78rem; }

.document-workspace {
  margin-top: 20px;
  overflow: hidden;
  background: #f5f7fb;
  border: 1px solid var(--line);
  border-radius: 16px;
}
#documentFrame { display: block; width: 100%; height: min(72vh, 780px); min-height: 560px; background: white; border: 0; }

details > summary { cursor: pointer; list-style: none; }
details > summary::-webkit-details-marker { display: none; }
.preview-panel { margin-top: 20px; border-top: 1px solid var(--line); }
.preview-panel summary { padding: 18px 2px 0; color: var(--blue); font-weight: 750; }
.table-scroll { overflow-x: auto; margin-top: 14px; padding-bottom: 5px; }
table { width: 100%; min-width: 1120px; border-collapse: separate; border-spacing: 0; font-size: 0.8rem; }
th, td { max-width: 180px; padding: 10px 12px; text-align: left; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
th { color: #5c6680; background: #f1f4f9; border-top: 1px solid var(--line); }
td { background: white; }
th:first-child, td:first-child { border-left: 1px solid var(--line); }
th:first-child { border-top-left-radius: 10px; }
th:last-child { border-top-right-radius: 10px; }
td:first-child { border-bottom-left-radius: 10px; }
td:last-child { border-bottom-right-radius: 10px; }

.utility-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.utility-grid-single { grid-template-columns: minmax(0, 1fr); }
.utility-card { overflow: hidden; }
.utility-card > summary { position: relative; padding: 20px 24px; font-weight: 800; }
.utility-card > summary::after { content: "+"; position: absolute; right: 24px; color: var(--blue); font-size: 1.2rem; }
.utility-card[open] > summary::after { content: "−"; }
.utility-content { padding: 0 24px 24px; }
.utility-content .button { margin-top: 12px; }

.history-list { display: grid; gap: 9px; margin-top: 6px; }
.history-item { display: flex; justify-content: space-between; gap: 12px; padding: 12px; background: #f5f7fb; border: 1px solid var(--line); border-radius: 12px; }
.history-item strong, .history-item span { display: block; }
.history-item strong { margin-bottom: 3px; font-size: 0.84rem; }
.history-item span { color: var(--muted); font-size: 0.75rem; }
.history-item button { flex: 0 0 auto; min-height: 36px; padding: 6px 10px; }
.empty-state { color: var(--muted); font-size: 0.88rem; }

.settings-dialog {
  width: min(560px, calc(100% - 28px));
  padding: 0;
  color: var(--ink);
  background: white;
  border: 0;
  border-radius: 20px;
  box-shadow: 0 24px 80px rgba(10, 20, 44, 0.35);
}
.settings-dialog::backdrop { background: rgba(11, 19, 39, 0.58); backdrop-filter: blur(5px); }
.settings-content { padding: 26px; }
.settings-dialog h2 { margin-bottom: 8px; }
.settings-dialog h3 { margin: 0 0 6px; font-size: 1rem; }
.settings-dialog form > p:not(.dialog-status) { margin: 0 0 16px; color: var(--muted); font-size: 0.86rem; }
.settings-choice-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 18px; }
.settings-choice { min-height: 58px; color: #1d55b5; text-align: left; background: #edf3ff; border-color: #d7e3fa; }
.settings-choice.active { color: white; background: var(--blue); border-color: var(--blue); }
.settings-panel { margin-top: 16px; padding: 18px; background: #f7f9fc; border: 1px solid var(--line); border-radius: 14px; }
.dialog-status { min-height: 22px; margin: 8px 0 0; color: var(--danger); font-size: 0.84rem; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }
.settings-close-row { padding-top: 4px; border-top: 1px solid var(--line); }

footer { padding: 10px 20px calc(30px + env(safe-area-inset-bottom)); text-align: center; color: #7b8499; font-size: 0.78rem; }

.toast {
  position: fixed;
  left: 50%;
  bottom: calc(22px + env(safe-area-inset-bottom));
  z-index: 50;
  max-width: calc(100% - 32px);
  padding: 11px 17px;
  color: white;
  text-align: center;
  background: rgba(17, 27, 54, 0.94);
  border-radius: 999px;
  box-shadow: 0 12px 32px rgba(17, 27, 54, 0.28);
  opacity: 0;
  transform: translate(-50%, 12px);
  pointer-events: none;
  transition: opacity 180ms ease, transform 180ms ease;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@media (max-width: 720px) {
  .site-header { min-height: 70px; }
  .brand img { width: 40px; height: 40px; }
  main { width: min(100% - 20px, 680px); margin-top: 16px; }
  .hero-card, .form-card, .output-card { padding: 20px 16px; border-radius: 18px; }
  .section-heading { align-items: stretch; flex-direction: column; gap: 16px; }
  .field-grid { grid-template-columns: 1fr; gap: 14px; }
  .field-wide { grid-column: auto; }
  .row-picker { grid-template-columns: 1fr 1fr; }
  .utility-grid { grid-template-columns: 1fr; gap: 14px; }
  .button-secondary { flex: 1 1 150px; }
  #documentFrame { height: 70vh; min-height: 520px; }
}

@media (max-width: 470px) {
  .source-actions .button { flex: 1 1 calc(50% - 10px); padding-inline: 10px; }
  .row-picker { grid-template-columns: 1fr; gap: 10px; }
  .copy-actions { flex-direction: column; }
  .button-copy { flex-basis: auto; }
  .button-secondary { flex-basis: auto; }
  .settings-content { padding: 22px 18px; }
  .settings-choice-grid { grid-template-columns: 1fr; }
  .dialog-actions .button { flex: 1 1 0; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}