:root {
  --ink: #141416;
  --muted: #6f737a;
  --soft: #a7adb5;
  --line: rgba(20, 20, 22, 0.1);
  --paper: #f5f5f7;
  --panel: rgba(255, 255, 255, 0.74);
  --panel-strong: rgba(255, 255, 255, 0.92);
  --black: #111113;
  --blue: #007aff;
  --green: #1f8a5f;
  --gold: #a87520;
  --red: #d63d35;
  --shadow: 0 18px 54px rgba(0, 0, 0, 0.08);
  --radius: 8px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 50% -12rem, rgba(255, 255, 255, 0.96), transparent 34rem),
    linear-gradient(180deg, #fbfbfd 0%, #f1f1f3 42%, #e9eaed 100%),
    var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

#input,
#scores,
#scoreDetails,
#evidence,
#actions {
  scroll-margin-top: 24px;
}

button, input, select { font: inherit; }
button { cursor: pointer; }

.app-shell {
  display: grid;
  grid-template-columns: 268px minmax(0, 1fr);
  min-height: 100vh;
}

.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 28px;
  background: rgba(245, 245, 247, 0.72);
  color: var(--ink);
  border-right: 1px solid var(--line);
  backdrop-filter: blur(30px) saturate(1.5);
}

.brand {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 42px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  background: var(--black);
  color: white;
  font-weight: 800;
  letter-spacing: 0;
  overflow: hidden;
}

.brand-logo {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand strong, .brand small { display: block; }
.brand strong { font-size: 15px; }
.brand small, .score-card small { color: var(--muted); font-size: 12px; }

.nav {
  display: grid;
  gap: 8px;
  margin-bottom: 34px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
  border-radius: var(--radius);
  padding: 10px 12px;
  background: transparent;
  transition: background .18s ease, color .18s ease;
}

.nav a:hover, .nav a.active {
  background: rgba(17, 19, 21, 0.06);
  color: var(--ink);
}

.score-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel-strong);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.055);
}

.score-card span, .score-card strong { display: block; }
.score-card strong { margin: 10px 0; font-size: 34px; line-height: 1; }
.meter { height: 8px; background: rgba(17, 19, 21, 0.09); margin: 16px 0 10px; border-radius: 999px; overflow: hidden; }
.meter i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--blue), var(--green)); transition: width .36s ease; }

.workspace {
  padding: 32px clamp(18px, 4vw, 64px) 64px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 42px;
  align-items: end;
  min-height: 310px;
  padding: 14px 0 34px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }
h1 {
  max-width: 900px;
  margin-bottom: 18px;
  font-size: clamp(40px, 5.6vw, 76px);
  line-height: 1;
  letter-spacing: 0;
  font-weight: 740;
}

h2 { font-size: 23px; line-height: 1.18; font-weight: 720; }
h3 { font-size: 15px; margin-bottom: 8px; }
.lede { max-width: 760px; color: var(--muted); font-size: 19px; line-height: 1.62; }

.diagnose-form {
  display: grid;
  gap: 16px;
  padding: 18px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(22px) saturate(1.2);
}

label span,
.scope-block > span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 46px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(250, 250, 249, 0.92);
  color: var(--ink);
  padding: 0 13px;
  outline: none;
}

input:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(43,111,214,.14); }

.scope-card {
  display: grid;
  gap: 6px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(250, 250, 249, 0.72);
}

.scope-card strong {
  font-size: 15px;
  line-height: 1.35;
}

.scope-card small {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.primary, .secondary {
  min-height: 46px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 0 16px;
  font-weight: 700;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.primary { background: var(--black); color: white; box-shadow: 0 12px 26px rgba(13, 14, 16, 0.18); }
.primary:hover, .secondary:hover { transform: translateY(-1px); }
.primary:disabled, .secondary:disabled { opacity: .62; cursor: not-allowed; transform: none; }
.secondary { background: rgba(255, 255, 255, 0.78); color: var(--ink); border-color: var(--line); }

.status-line {
  margin: 8px 0 20px;
  color: var(--muted);
  font-size: 14px;
}

.progress-panel {
  display: none;
  margin: 0 0 18px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.052);
  backdrop-filter: blur(22px) saturate(1.24);
}

.progress-panel.is-active { display: block; }

.progress-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 12px;
}

.progress-top span {
  color: var(--ink);
  font-size: 15px;
  font-weight: 720;
}

.progress-top strong {
  color: var(--blue);
  font-size: 15px;
}

.progress-track {
  height: 7px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(17, 19, 21, 0.08);
}

.progress-track i {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue), var(--green));
  transition: width .42s cubic-bezier(.2, .8, .2, 1);
}

.progress-steps {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.progress-steps li {
  position: relative;
  padding-top: 16px;
  color: var(--soft);
  font-size: 12px;
  line-height: 1.3;
}

.progress-steps li::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: rgba(17, 19, 21, 0.14);
}

.progress-steps li.is-done,
.progress-steps li.is-active {
  color: var(--ink);
}

.progress-steps li.is-done::before {
  background: var(--green);
}

.progress-steps li.is-active::before {
  background: var(--blue);
  box-shadow: 0 0 0 6px rgba(0, 122, 255, 0.11);
}

.progress-steps li.is-active::after {
  content: "";
  position: absolute;
  top: -2px;
  left: -2px;
  width: 12px;
  height: 12px;
  border: 1px solid rgba(0, 122, 255, 0.32);
  border-radius: 999px;
  animation: pulseRing 1.2s ease-out infinite;
}

@keyframes pulseRing {
  from { transform: scale(.7); opacity: .7; }
  to { transform: scale(1.9); opacity: 0; }
}

.result-head, .panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.055);
  backdrop-filter: blur(24px) saturate(1.32);
}

.result-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: start;
  padding: 24px;
  margin-bottom: 18px;
}

.result-head p { color: var(--muted); line-height: 1.6; margin-bottom: 0; }

.result-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.score-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-bottom: 18px;
}

.score-grid article {
  padding: 20px;
  border-radius: var(--radius);
  background: var(--black);
  color: white;
}

.score-grid span, .score-grid small { display: block; color: rgba(255,255,255,.66); }
.score-grid strong { font-size: 34px; line-height: 1; margin-right: 4px; }

.ai-panel { overflow: hidden; }

.ai-grid {
  display: grid;
  grid-template-columns: 132px 132px minmax(0, 1fr);
  gap: 1px;
  margin: 0 -24px 16px;
  border-block: 1px solid var(--line);
  background: var(--line);
}

.ai-grid article {
  padding: 18px 24px;
  border: 0;
  border-radius: 0;
  background: rgba(255, 255, 255, 0.58);
}

.ai-grid span,
.ai-grid small {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.ai-grid strong {
  display: block;
  margin: 7px 0 3px;
  font-size: 34px;
  line-height: 1;
  letter-spacing: 0;
}

.ai-summary {
  margin-bottom: 16px;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.55;
}

.ai-findings {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.ai-findings > div {
  padding: 16px;
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.ai-findings ul,
.score-detail ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.65;
}

.panel {
  padding: 24px;
  margin-bottom: 18px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 28px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.section-title span {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: rgba(10, 132, 255, 0.11);
  color: var(--blue);
  font-weight: 760;
}

.section-title h2 { margin: 0; }

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.evidence-grid article, .rewrite-grid article {
  min-height: 118px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(250, 250, 249, 0.74);
}

.evidence-grid p, .rewrite-grid p, .issue p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.score-list {
  display: grid;
  gap: 10px;
}

.score-row {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(250, 250, 249, 0.74);
  overflow: hidden;
}

.score-row summary {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) 64px;
  gap: 10px;
  align-items: center;
  padding: 12px;
  list-style: none;
  cursor: pointer;
}

.score-row summary::-webkit-details-marker { display: none; }
.score-row summary::before {
  content: "›";
  color: var(--blue);
  font-weight: 900;
  font-size: 19px;
  transition: transform .16s ease;
}
.score-row[open] summary::before { transform: rotate(90deg); }
.score-row span { color: var(--muted); }
.score-row strong { text-align: right; }
.score-row i {
  grid-column: 1 / -1;
  height: 6px;
  background: linear-gradient(90deg, var(--green) var(--w), #edf2f7 var(--w));
}

.score-detail {
  border-top: 1px solid var(--line);
  padding: 12px 14px 14px;
}

.score-detail p {
  margin-bottom: 10px;
  color: var(--ink);
  line-height: 1.55;
}

.detail-cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.detail-cols > div {
  padding: 12px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
}

.detail-cols h4 {
  margin: 0 0 8px;
  font-size: 13px;
}

.issue-list {
  display: grid;
  gap: 10px;
}

.issue {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(250, 250, 249, 0.74);
}

.issue strong {
  color: white;
  display: grid;
  place-items: center;
  height: 30px;
  border-radius: 999px;
  background: var(--gold);
}
.issue.p0 strong { background: var(--red); }
.issue.p1 strong { background: var(--blue); }
.issue.p2 strong { background: var(--green); }

.action-list {
  margin: 0;
  padding-left: 24px;
  color: var(--ink);
  line-height: 1.8;
  font-size: 17px;
}

.result-head,
.score-grid,
.ai-panel,
#evidence,
.panel.split,
#actions,
#rewritePanel,
#leadPanel {
  transition: opacity .32s ease, transform .32s ease, filter .32s ease;
}

.is-loading-section {
  opacity: .45;
  transform: translateY(4px);
  filter: saturate(.72);
}

.is-revealing {
  animation: revealSection .38s ease both;
}

@keyframes revealSection {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.rewrite-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.lead-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 28px;
  align-items: center;
  background: var(--panel-strong);
}

.lead-panel p:not(.eyebrow) {
  margin: 0;
  color: var(--muted);
  line-height: 1.62;
}

.lead-form {
  display: grid;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(250, 250, 249, 0.8);
}

.lead-form small {
  color: var(--muted);
  line-height: 1.45;
}

.hidden-field {
  display: none;
}

@media (max-width: 1040px) {
  .app-shell { grid-template-columns: 1fr; }
  .rail {
    position: sticky;
    top: 0;
    z-index: 40;
    height: auto;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 18px;
    align-items: start;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    box-shadow: 0 10px 34px rgba(0, 0, 0, 0.065);
  }
  .brand { margin-bottom: 0; }
  .nav {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin-bottom: 0;
  }
  .nav a { text-align: center; }
  .score-card { min-width: 210px; }
  .hero, .split, .lead-panel { grid-template-columns: 1fr; }
  .evidence-grid, .rewrite-grid, .ai-findings { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .progress-steps {
    grid-template-columns: repeat(5, minmax(64px, 1fr));
    overflow-x: auto;
  }
  #input,
  #scores,
  #scoreDetails,
  #evidence,
  #actions {
    scroll-margin-top: 168px;
  }
}

@media (max-width: 640px) {
  body {
    background:
      linear-gradient(180deg, #fafafd 0%, #f2f2f5 48%, #ebecef 100%),
      var(--paper);
  }
  .rail {
    top: 0;
    padding: 14px 16px 12px;
    gap: 12px;
    grid-template-columns: minmax(0, 1fr) 118px;
    border-bottom: 1px solid var(--line);
    border-right: 0;
  }
  .brand-mark {
    width: 34px;
    height: 34px;
    font-size: 13px;
  }
  .brand { order: 1; gap: 10px; min-width: 0; }
  .brand strong { font-size: 14px; }
  .brand small { display: none; }
  .nav {
    order: 3;
    grid-column: 1 / -1;
    gap: 4px;
    overflow-x: auto;
    grid-template-columns: repeat(4, minmax(70px, 1fr));
  }
  .nav a {
    padding: 8px 6px;
    font-size: 13px;
  }
  .score-card {
    order: 2;
    grid-column: auto;
    display: grid;
    gap: 2px;
    align-content: center;
    justify-items: end;
    min-width: 0;
    min-height: 42px;
    padding: 8px 10px;
  }
  .score-card span {
    font-size: 10px;
    line-height: 1;
    white-space: nowrap;
  }
  .score-card strong {
    margin: 0;
    text-align: right;
    max-width: 100%;
    font-size: 20px;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    white-space: nowrap;
  }
  .score-card .meter,
  .score-card small {
    display: none;
  }
  .workspace { padding: 18px 12px 44px; }
  .hero {
    min-height: auto;
    gap: 18px;
    padding-top: 10px;
  }
  .progress-panel {
    padding: 16px;
    margin-bottom: 14px;
  }
  .progress-steps {
    grid-template-columns: repeat(5, minmax(76px, 1fr));
    padding-bottom: 2px;
  }
  .progress-steps li {
    font-size: 11px;
  }
  .diagnose-form,
  .result-head,
  .panel {
    padding: 18px;
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.05);
  }
  .result-head { display: block; }
  .result-actions { margin-top: 14px; justify-content: stretch; }
  .result-actions .secondary { flex: 1; min-width: 0; }
  .score-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }
  .score-grid article { padding: 14px 10px; }
  .score-grid span, .score-grid small { font-size: 11px; }
  .score-grid strong { display: block; font-size: 27px; margin: 6px 0 2px; }
  .evidence-grid, .rewrite-grid, .ai-findings, .detail-cols { grid-template-columns: 1fr; }
  .ai-grid {
    grid-template-columns: 1fr 1fr;
    margin: 0 -18px 14px;
  }
  .ai-grid article {
    padding: 14px 18px;
    min-height: 82px;
  }
  .ai-grid article:nth-child(3) {
    grid-column: 1 / -1;
    min-height: 0;
  }
  .ai-grid strong { font-size: 28px; }
  .ai-grid article:nth-child(3) strong { font-size: 24px; }
  .ai-summary { font-size: 16px; line-height: 1.58; }
  .ai-findings { gap: 10px; }
  .ai-findings > div,
  .evidence-grid article,
  .rewrite-grid article,
  .score-row,
  .issue {
    background: rgba(255, 255, 255, 0.62);
  }
  .section-title {
    gap: 10px;
    margin-bottom: 14px;
  }
  .section-title span {
    width: 30px;
    height: 30px;
    font-size: 14px;
  }
  h1 { font-size: 35px; line-height: 1.08; }
  h2 { font-size: 22px; }
  .lede { font-size: 16px; line-height: 1.62; }
  .panel { margin-bottom: 14px; }
  .action-list { font-size: 16px; line-height: 1.72; }
}

@media print {
  @page {
    margin: 14mm;
  }

  * {
    box-shadow: none !important;
    text-shadow: none !important;
  }

  body {
    background: #fff;
    color: #111;
  }

  .app-shell {
    display: block;
  }

  .rail,
  .hero,
  .status-line,
  .progress-panel,
  .result-actions,
  .lead-panel {
    display: none !important;
  }

  .workspace {
    padding: 0;
  }

  .result-head,
  .panel {
    break-inside: avoid;
    margin-bottom: 12px;
    border-color: #ddd;
    background: #fff;
  }

  .score-grid article {
    background: #111;
    color: #fff;
  }

  .score-row .score-detail,
  .score-row[open] .score-detail {
    display: block;
  }

  .score-row summary::before {
    display: none;
  }
}