/* Agent1 官网 — 墨色纸面 · 铜橙 */
:root {
  --ink: #1c1914;
  --ink-deep: #100e0b;
  --ink-lift: #2a261f;
  --fog: #e4dcd0;
  --fog-dim: #a3988c;
  --paper: #f4efe6;
  --accent: #d4773b;
  --accent-bright: #e8a06a;
  --accent-soft: rgba(212, 119, 59, 0.16);
  --blue: #8eb4f5;
  --hairline: rgba(244, 239, 230, 0.12);
  --hairline-strong: rgba(244, 239, 230, 0.22);
  --serif: "Instrument Serif", "Songti SC", serif;
  --sans: "DM Sans", "PingFang SC", "Noto Sans SC", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --top-h: 3.6rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--fog);
  background:
    radial-gradient(980px 480px at 82% -10%, rgba(212, 119, 59, 0.18), transparent 55%),
    radial-gradient(820px 460px at -8% 100%, rgba(76, 139, 245, 0.08), transparent 50%),
    linear-gradient(168deg, var(--ink-deep) 0%, var(--ink) 48%, #241f18 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

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

.skip {
  position: absolute;
  left: -999px;
  top: 0;
}
.skip:focus {
  left: 1rem;
  top: 1rem;
  z-index: 40;
  background: var(--paper);
  color: var(--ink-deep);
  padding: 0.5rem 0.75rem;
}

.frame {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.shell-top {
  position: sticky;
  top: 0;
  z-index: 30;
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  background: rgba(16, 14, 11, 0.78);
  border-bottom: 1px solid var(--hairline);
}

.shell-top-inner {
  min-height: var(--top-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--paper);
}

.mark-icon {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  box-shadow: 0 0 0 1px var(--hairline-strong);
}

.mark-word {
  font-family: var(--serif);
  font-size: 1.35rem;
  letter-spacing: 0.01em;
  line-height: 1;
}
.mark-word span {
  color: var(--accent);
}

.shell-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem 1.1rem;
}

.shell-nav {
  display: flex;
  align-items: center;
  gap: 0.15rem 0.85rem;
  font-size: 0.9rem;
  color: var(--fog-dim);
}

.shell-nav a {
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.shell-nav a:hover,
.shell-nav a[aria-current="page"] {
  color: var(--paper);
}

.nav-github {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.45rem 0.28rem 0.55rem;
  border: 1px solid var(--hairline-strong);
  border-radius: 999px;
  background: rgba(212, 119, 59, 0.08);
  color: var(--paper);
  cursor: pointer;
}
.lang-switch:hover,
.lang-switch:focus-within {
  border-color: var(--accent);
  background: rgba(212, 119, 59, 0.14);
}

.lang-switch select {
  appearance: none;
  -webkit-appearance: none;
  border: 0;
  background: transparent;
  color: inherit;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 500;
  line-height: 1.2;
  padding: 0.1rem 1.1rem 0.1rem 0;
  cursor: pointer;
  min-width: 6.2rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%23e4dcd0' d='M1 1l4 4 4-4'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.1rem center;
}
.lang-switch select:focus {
  outline: none;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 44rem);
  gap: 2.5rem 3rem;
  align-items: end;
  padding: 3.2rem 0 2.2rem;
  animation: rise 0.85s var(--ease) both;
}

.hero:has(#clip-hero img) {
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  align-items: center;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

.kicker {
  margin: 0 0 0.85rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-bright);
}

.hero h1 {
  margin: 0 0 0.9rem;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2.4rem, 5vw, 3.7rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.lede {
  margin: 0 0 1.7rem;
  color: var(--fog-dim);
  font-size: 1.08rem;
  max-width: 34rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 0.9rem;
  align-items: center;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  transition: transform 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.cta-primary {
  padding: 0.78rem 1.35rem;
  background: var(--paper);
  color: var(--ink-deep);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.28);
}
.cta-primary:hover {
  background: #fff;
  transform: translateY(-1px);
}

.cta-secondary {
  padding: 0.72rem 1.2rem;
  border: 1px solid var(--hairline-strong);
  color: var(--paper);
  background: rgba(255, 255, 255, 0.03);
}
.cta-secondary:hover {
  border-color: var(--accent);
  color: var(--accent-bright);
}

.cta-text {
  padding: 0.45rem 0.2rem;
  color: var(--fog-dim);
  font-weight: 500;
}
.cta-text:hover {
  color: var(--paper);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem 2rem;
  margin: 1.8rem 0 0;
  padding: 0;
  list-style: none;
}

.hero-stats strong {
  display: block;
  font-family: var(--serif);
  font-size: 1.65rem;
  font-weight: 400;
  color: var(--paper);
  line-height: 1.1;
}

.hero-stats span {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.82rem;
  color: var(--fog-dim);
}

.clip:not(:has(img)) {
  display: none;
}

.clip {
  margin: 0 0 1.35rem;
  border: 1px solid var(--hairline-strong);
  border-radius: 14px;
  overflow: hidden;
  background: #16130f;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.clip img {
  width: 100%;
  height: auto;
  display: block;
}

.pillar .idx {
  margin: 0 0 0.65rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent-bright);
}

.facts {
  margin: 0.2rem 0 0;
  padding: 0;
  list-style: none;
  max-width: 40rem;
}

.facts li {
  margin: 0.45rem 0;
  color: var(--fog);
}

.facts li::before {
  content: "";
  display: inline-block;
  width: 0.45rem;
  height: 0.45rem;
  margin-right: 0.55rem;
  border-radius: 50%;
  background: var(--accent);
  transform: translateY(-0.05rem);
}

.snippet {
  margin: 1rem 0 0.6rem;
  max-width: 36rem;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--fog);
  background: var(--ink-deep);
  border-radius: 10px;
  border: 1px solid var(--hairline);
}

.pillar .hint {
  margin: 0.35rem 0 0;
  font-size: 0.92rem;
}

.pillar .copy-block {
  max-width: 46rem;
}

.ai-box h2 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.35rem;
  color: var(--paper);
}

.hero-stage {
  margin: 0;
  border: 1px solid var(--hairline-strong);
  border-radius: 14px;
  overflow: hidden;
  background: #16130f;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.04) inset,
    0 30px 80px rgba(0, 0, 0, 0.45);
}

.stage-chrome {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 0.95rem;
  background: rgba(0, 0, 0, 0.35);
  border-bottom: 1px solid var(--hairline);
}

.stage-chrome span {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #5c5348;
}
.stage-chrome span:nth-child(1) { background: #c46a4a; }
.stage-chrome span:nth-child(2) { background: #d4a24a; }
.stage-chrome span:nth-child(3) { background: #7d8a62; }

.stage-chrome em {
  margin-left: 0.55rem;
  font-style: normal;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--fog-dim);
}

.term {
  padding: 1.15rem 1.2rem 1.25rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
}

.term p {
  margin: 0;
}

.term-line {
  color: var(--fog);
}
.prompt {
  color: var(--accent-bright);
  margin-right: 0.45rem;
}

.term-user {
  margin-top: 0.85rem !important;
  color: var(--paper);
}

.term-trace {
  list-style: none;
  margin: 0.95rem 0 0;
  padding: 0.85rem 0.9rem;
  border-radius: 10px;
  background: rgba(244, 239, 230, 0.04);
  border: 1px solid var(--hairline);
}

.term-trace li {
  display: grid;
  grid-template-columns: 7.2rem 1fr;
  gap: 0.6rem;
  padding: 0.22rem 0;
  color: var(--fog-dim);
}

.tool {
  color: var(--blue);
}

.term-ok {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.95rem !important;
  color: #b7c9a4;
}

.ok-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #8eae78;
  box-shadow: 0 0 0 4px rgba(142, 174, 120, 0.15);
}

.section {
  padding: 4.2rem 0 0.5rem;
  border-top: 1px solid var(--hairline);
}

.section h2 {
  margin: 0 0 0.55rem;
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.8rem, 3vw, 2.35rem);
  color: var(--paper);
}

.section-head {
  max-width: 38rem;
  margin-bottom: 1.5rem;
}

.section-head p,
.section > p,
.steps p {
  margin: 0 0 1.15rem;
  color: var(--fog-dim);
  max-width: 40rem;
}

.feature-grid,
.flow,
.start-grid {
  display: grid;
  gap: 0.85rem;
}

.feature-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card,
.flow article,
.start-card {
  border: 1px solid var(--hairline);
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.2);
  padding: 1.15rem 1.2rem 1.2rem;
}

.card h3,
.flow h3,
.start-card h3,
.steps h3 {
  margin: 0 0 0.4rem;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.35rem;
  color: var(--paper);
}

.card p,
.flow p,
.start-card p {
  margin: 0;
  color: var(--fog-dim);
  max-width: none;
}

.card .idx {
  display: block;
  margin-bottom: 0.7rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--accent-bright);
}

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

.flow article {
  position: relative;
}

.flow h3 span:first-child {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--fog-dim);
}

.start-grid {
  grid-template-columns: 1.15fr 0.85fr;
  align-items: stretch;
}

.start-card pre,
.copy-block pre,
.ai-box pre {
  margin: 0.85rem 0 0;
  padding: 0.95rem 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.55;
  color: var(--fog);
  background: var(--ink-deep);
  border-radius: 10px;
  border: 1px solid var(--hairline);
  white-space: pre-wrap;
}

.key-line {
  margin-top: 0.85rem !important;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--paper) !important;
}

.ai-box {
  margin-top: 1.6rem;
  padding: 1.35rem 1.4rem 1.25rem;
  border: 1px solid var(--hairline-strong);
  border-radius: 14px;
  background:
    linear-gradient(135deg, rgba(212, 119, 59, 0.1), transparent 46%),
    rgba(0, 0, 0, 0.22);
}

.ai-head {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.45rem;
}

.ai-badge {
  display: inline-grid;
  place-items: center;
  min-width: 2rem;
  height: 1.45rem;
  padding: 0 0.45rem;
  border-radius: 999px;
  background: var(--accent);
  color: var(--ink-deep);
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.ai-box h3 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.35rem;
  color: var(--paper);
}

.ai-box > p {
  margin: 0 0 0.15rem;
  color: var(--fog-dim);
  max-width: 42rem;
}

.copy-block {
  position: relative;
  margin-top: 0.85rem;
}

.copy-block pre {
  margin: 0;
  padding-right: 4.6rem;
}

.copy-btn {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  border: 1px solid var(--hairline-strong);
  background: rgba(28, 25, 20, 0.95);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 0.78rem;
  padding: 0.32rem 0.65rem;
  border-radius: 999px;
  cursor: pointer;
}
.copy-btn:hover,
.copy-btn.is-done {
  color: var(--accent-bright);
  border-color: var(--accent);
}

.ai-links {
  margin: 0.9rem 0 0;
  font-size: 0.92rem;
  color: var(--fog-dim);
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.55rem;
}
.ai-links a {
  color: var(--paper);
}
.ai-links a:hover {
  color: var(--accent-bright);
}

.foot {
  padding: 2.6rem 0 2.4rem;
  margin-top: 3.2rem;
  border-top: 1px solid var(--hairline);
  font-size: 0.85rem;
  color: var(--fog-dim);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  align-items: center;
}

.foot-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.foot-brand img {
  width: 18px;
  height: 18px;
  border-radius: 4px;
}

.foot a:hover {
  color: var(--accent-bright);
}

.steps {
  max-width: 44rem;
  padding-top: 2.4rem;
  border-top: none;
}

.steps h3 {
  margin-top: 2.2rem;
  font-size: 1.7rem;
}

.steps .hint {
  color: var(--fog-dim);
  margin: 0.7rem 0 0;
  max-width: 40rem;
}

.steps ol {
  margin: 0.8rem 0 0;
  padding-left: 1.2rem;
  color: var(--fog-dim);
}
.steps ol li {
  margin: 0.4rem 0;
}
.steps code,
.card code,
.start-card code {
  font-family: var(--mono);
  font-size: 0.86em;
  color: var(--paper);
}

@media (max-width: 900px) {
  .hero,
  .feature-grid,
  .flow,
  .start-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding-top: 2rem;
  }
}

@media (max-width: 720px) {
  .frame {
    width: min(1120px, calc(100% - 1.5rem));
  }
  .shell-nav a:not(.nav-github) {
    display: none;
  }
  .nav-github span {
    display: none;
  }
  .term-trace li {
    grid-template-columns: 1fr;
    gap: 0.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero { animation: none; }
}