:root {
  --qa-bg: #14110d;
  --qa-bg-2: #1c1711;
  --qa-panel: rgba(32, 26, 20, 0.88);
  --qa-panel-2: rgba(43, 34, 25, 0.9);
  --qa-ink: #f5efe5;
  --qa-muted: rgba(245, 239, 229, 0.7);
  --qa-line: rgba(245, 239, 229, 0.11);
  --qa-line-strong: rgba(245, 239, 229, 0.18);
  --qa-accent: #d4a054;
  --qa-accent-2: #7dc8b8;
  --qa-warn: #f0c674;
  --qa-shadow: 0 28px 80px rgba(0, 0, 0, 0.34);
  --qa-radius-xl: 32px;
  --qa-radius-l: 24px;
  --qa-radius-m: 18px;
  --qa-max: 1320px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--qa-ink);
  font-family: "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at 18% 14%, rgba(212, 160, 84, 0.18), transparent 22%),
    radial-gradient(circle at 82% 12%, rgba(125, 200, 184, 0.12), transparent 20%),
    linear-gradient(180deg, var(--qa-bg) 0%, var(--qa-bg-2) 100%);
}

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

img {
  display: block;
  max-width: 100%;
}

button,
textarea {
  font: inherit;
}

.qa-shell {
  min-height: 100vh;
  padding: 18px 18px 28px;
}

.qa-shell::before,
.qa-shell::after {
  content: "";
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: -1;
}

.qa-shell::before {
  top: 15%;
  left: -8%;
  width: 34vw;
  height: 34vw;
  background: radial-gradient(circle, rgba(212, 160, 84, 0.08), transparent 68%);
}

.qa-shell::after {
  right: -10%;
  bottom: 10%;
  width: 38vw;
  height: 38vw;
  background: radial-gradient(circle, rgba(125, 200, 184, 0.08), transparent 68%);
}

.qa-header {
  width: min(var(--qa-max), calc(100% - 12px));
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 126px;
  height: 44px;
  display: block;
  flex: 0 0 126px;
  padding: 8px 10px;
  border-radius: 18px;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0.04)),
    linear-gradient(135deg, rgba(0, 107, 232, 0.18), rgba(90, 52, 255, 0.28));
  border: 1px solid rgba(255, 255, 255, 0.16);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.22),
    0 18px 44px rgba(44, 28, 122, 0.28);
}

.brand-mark img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 0;
}

.brand-copy {
  display: grid;
  gap: 4px;
}

.brand-copy strong {
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}

.brand-copy span {
  color: var(--qa-muted);
  font-size: 0.9rem;
}

.qa-nav {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 7px;
  border-radius: 999px;
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.03);
}

.qa-nav a {
  padding: 10px 16px;
  border-radius: 999px;
  color: var(--qa-muted);
  transition: color 0.22s ease, background 0.22s ease;
}

.qa-nav a:hover {
  color: var(--qa-ink);
  background: rgba(255, 255, 255, 0.08);
}

.qa-main {
  width: min(var(--qa-max), calc(100% - 12px));
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

.qa-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.72fr);
  gap: 18px;
}

.qa-hero-copy,
.qa-hero-card,
.qa-sidebar,
.qa-answer-board,
.qa-footer {
  border: 1px solid var(--qa-line);
  background: var(--qa-panel);
  box-shadow: var(--qa-shadow);
}

.qa-hero-copy,
.qa-hero-card,
.qa-sidebar,
.qa-answer-board {
  border-radius: var(--qa-radius-xl);
}

.qa-hero-copy {
  padding: clamp(28px, 4vw, 44px);
  background:
    linear-gradient(135deg, rgba(212, 160, 84, 0.12), transparent 34%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.02)),
    var(--qa-panel);
}

.eyebrow,
.panel-head p {
  margin: 0;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(245, 239, 229, 0.56);
  font-size: 0.76rem;
}

.qa-hero-copy h1 {
  margin: 14px 0 0;
  max-width: 11ch;
  font-family: "Iowan Old Style", "Palatino Linotype", "Songti SC", serif;
  font-size: clamp(3.2rem, 6vw, 5.8rem);
  line-height: 0.94;
  letter-spacing: -0.05em;
}

.hero-text {
  max-width: 54ch;
  margin: 18px 0 0;
  color: var(--qa-muted);
  line-height: 1.8;
  font-size: 1.03rem;
}

.hero-pills,
.button-row,
.followup-list,
.sources-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-pills {
  margin-top: 28px;
}

.hero-pills span,
.followup-chip,
.source-chip {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.04);
  color: rgba(245, 239, 229, 0.86);
}

.qa-hero-card {
  padding: 24px;
  display: grid;
  gap: 18px;
  background:
    radial-gradient(circle at 18% 18%, rgba(125, 200, 184, 0.16), transparent 28%),
    var(--qa-panel-2);
}

.hero-card-top {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--qa-accent-2);
  box-shadow: 0 0 18px rgba(125, 200, 184, 0.7);
}

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

.hero-stat-grid article {
  padding: 16px;
  border-radius: var(--qa-radius-m);
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.03);
}

.hero-stat-grid strong {
  display: block;
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
}

.hero-stat-grid span,
.hero-card-note,
.trace-list,
.answer-card p,
.answer-card li,
.qa-footer p {
  color: var(--qa-muted);
  line-height: 1.72;
}

.hero-card-note {
  margin: 0;
}

.qa-workbench {
  display: grid;
  grid-template-columns: minmax(300px, 0.78fr) minmax(0, 1.22fr);
  gap: 18px;
  align-items: start;
}

.qa-sidebar,
.qa-answer-board {
  padding: 24px;
}

.qa-sidebar {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 18px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.panel-head span {
  color: var(--qa-muted);
  font-size: 0.9rem;
}

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

.preset-btn {
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--qa-ink);
  cursor: pointer;
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.preset-btn:hover,
.preset-btn.is-active {
  transform: translateY(-2px);
  border-color: rgba(212, 160, 84, 0.42);
  background: rgba(212, 160, 84, 0.08);
}

.preset-btn strong {
  display: block;
  margin-bottom: 6px;
  font-size: 1rem;
}

.preset-btn span {
  color: var(--qa-muted);
  font-size: 0.92rem;
  line-height: 1.6;
}

.query-field {
  display: grid;
  gap: 10px;
}

.query-field span {
  color: rgba(245, 239, 229, 0.84);
  font-size: 0.95rem;
}

.query-field textarea {
  width: 100%;
  padding: 16px 18px;
  border-radius: 20px;
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--qa-ink);
  resize: vertical;
}

.button {
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: #1a1208;
  background: linear-gradient(135deg, #f0c674, #d4a054);
}

.button-secondary {
  color: var(--qa-ink);
  border-color: var(--qa-line);
  background: rgba(255, 255, 255, 0.03);
}

.status-card {
  padding-top: 8px;
  border-top: 1px solid var(--qa-line);
}

.trace-list {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.trace-item {
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.03);
}

.trace-item strong {
  display: block;
  margin-bottom: 4px;
  color: var(--qa-ink);
}

.qa-answer-board {
  display: grid;
  gap: 18px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.015)),
    var(--qa-panel);
}

.answer-summary {
  padding: 18px 20px;
  border-radius: 20px;
  border: 1px solid rgba(212, 160, 84, 0.2);
  background: rgba(212, 160, 84, 0.08);
  color: rgba(245, 239, 229, 0.88);
  line-height: 1.8;
}

.answer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr) minmax(0, 0.9fr);
  gap: 16px;
}

.answer-card,
.sources-section {
  border-radius: 22px;
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.035);
}

.answer-card {
  min-height: 220px;
  padding: 20px;
}

.answer-card-primary {
  background:
    linear-gradient(135deg, rgba(212, 160, 84, 0.1), rgba(125, 200, 184, 0.06)),
    rgba(255, 255, 255, 0.03);
}

.answer-card h3 {
  margin: 0 0 14px;
  font-size: 1.14rem;
}

.bullet-list {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
}

.followup-chip,
.source-chip {
  cursor: pointer;
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.followup-chip:hover,
.source-chip:hover {
  transform: translateY(-2px);
  border-color: rgba(212, 160, 84, 0.36);
  background: rgba(212, 160, 84, 0.08);
}

.sources-section {
  padding: 20px;
}

.source-card {
  display: grid;
  gap: 10px;
  padding: 16px;
  border-radius: 18px;
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.03);
}

.source-card strong {
  font-size: 0.96rem;
}

.source-card p {
  margin: 0;
  color: var(--qa-muted);
}

.source-card.is-focused {
  border-color: rgba(125, 200, 184, 0.34);
  background: rgba(125, 200, 184, 0.08);
}

.qa-footer {
  width: min(var(--qa-max), calc(100% - 12px));
  margin: 18px auto 0;
  padding: 18px 22px;
  border-radius: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}

.footer-brand img {
  width: 52px;
  height: 52px;
  border-radius: 16px;
  object-fit: contain;
  background: rgba(255, 255, 255, 0.96);
}

.footer-brand strong,
.footer-link {
  color: var(--qa-ink);
}

.footer-brand p {
  margin: 4px 0 0;
  color: var(--qa-muted);
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--qa-line);
  background: rgba(255, 255, 255, 0.03);
}

.fade-in {
  animation: fade-in 0.32s ease both;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1080px) {
  .qa-hero,
  .qa-workbench,
  .answer-grid {
    grid-template-columns: 1fr;
  }

  .qa-sidebar {
    position: static;
  }
}

@media (max-width: 820px) {
  .qa-shell {
    padding: 12px 12px 18px;
  }

  .qa-header,
  .qa-footer {
    width: 100%;
  }

  .qa-header {
    flex-direction: column;
    align-items: flex-start;
  }

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

  .qa-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}