:root {
  --void: #07080c;
  --stage: #0c0e13;
  --plate: #14171e;
  --ink: #eef2f7;
  --mute: #9aa4b4;
  --line: rgba(236, 240, 246, 0.12);
  --silver: #c9d2de;
  --chrome-hi: #f7f9fc;
  --chrome-mid: #8e98a8;
  --focus: #dbe3ee;
  --wrap: min(1120px, calc(100% - 2.4rem));
  --font: Bahnschrift, "Segoe UI Variable Display", "Segoe UI", "Avenir Next", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: auto;
}

html.allow-motion {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: radial-gradient(1200px 700px at 12% -10%, #2a303b 0%, transparent 55%),
    radial-gradient(900px 600px at 92% 8%, #1b2430 0%, transparent 50%),
    linear-gradient(180deg, #08090d 0%, #0b0d12 40%, #07080c 100%);
  font-family: var(--font);
  font-size: 1.02rem;
  line-height: 1.65;
}

body.nav-lock {
  overflow: hidden;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--silver);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--chrome-hi);
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 80;
  padding: 0.55rem 0.9rem;
  background: #1a1e26;
  color: var(--ink);
  border-radius: 999px;
}

.skip-link:focus {
  top: 0.7rem;
}

.wrap {
  width: var(--wrap);
  margin-inline: auto;
}

.alloy-bar {
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, #1b1f28, #2a303a 40%, #171b22);
  color: var(--mute);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.alloy-bar-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0;
}

.alloy-bar b {
  color: var(--ink);
  font-weight: 600;
}

.site-head {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(16px);
  background: rgba(10, 12, 16, 0.72);
  border-bottom: 1px solid transparent;
}

.site-head.is-pinned {
  border-bottom-color: var(--line);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.2rem;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: inherit;
  text-decoration: none;
}

.brand-lockup img {
  width: 42px;
  height: 42px;
  object-fit: cover;
  border-radius: 50%;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.25), inset 0 0 12px rgba(255, 255, 255, 0.18);
}

.brand-lockup span {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.brand-lockup small {
  color: var(--mute);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.nav-switch {
  display: none;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, #2a303a, #15181f);
  color: var(--ink);
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  font: inherit;
  cursor: pointer;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  padding: 0.42rem 0.78rem;
  color: var(--mute);
  text-decoration: none;
  border-radius: 999px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
}

.site-nav a.cta {
  color: #111318;
  background: linear-gradient(180deg, #f8fafc 0%, #c7cfd9 38%, #8b95a4 70%, #e7ebf1 100%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7), 0 6px 18px rgba(0, 0, 0, 0.28);
  font-weight: 650;
}

.site-nav a.cta:hover {
  color: #0b0d11;
}

.fluid-stage {
  position: relative;
  overflow: hidden;
  padding: 4.2rem 0 3.4rem;
}

.orb {
  position: absolute;
  pointer-events: none;
  filter: blur(1.5px);
  opacity: 0.55;
}

.orb-a {
  width: 280px;
  height: 280px;
  left: -70px;
  top: 20px;
  background: radial-gradient(circle at 32% 28%, #ffffffcc, #c5ceda 36%, #6b7382 68%, #1c2028);
  border-radius: 46% 54% 62% 38% / 42% 38% 62% 58%;
}

.orb-b {
  width: 220px;
  height: 220px;
  right: 8%;
  top: 12%;
  background: radial-gradient(circle at 30% 30%, #f4f7fb, #aeb7c4 42%, #4d5562);
  border-radius: 58% 42% 38% 62% / 48% 56% 44% 52%;
}

.orb-c {
  width: 160px;
  height: 160px;
  right: 18%;
  bottom: 8%;
  background: radial-gradient(circle at 40% 30%, #ffffffaa, #8f98a6 55%, #2a2f38);
  border-radius: 40% 60% 55% 45% / 50% 40% 60% 50%;
}

.hero-grid,
.duo,
.flow-4,
.flow-3,
.flow-2 {
  display: grid;
  gap: 1.4rem;
}

.hero-grid,
.duo {
  grid-template-columns: 1.08fr 0.92fr;
  align-items: center;
}

.flow-4 {
  grid-template-columns: repeat(4, 1fr);
}

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

.flow-2 {
  grid-template-columns: 1fr 1fr;
}

.metal-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0.35rem 0.45rem 0;
  padding: 0.22rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.03));
  color: var(--silver);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.metal-chip.is-on {
  color: #111318;
  background: linear-gradient(180deg, #f5f7fa, #b7c0cc);
}

.kicker {
  display: inline-block;
  margin-bottom: 0.55rem;
  color: var(--silver);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-size: 0.74rem;
}

.metal-title,
h1 {
  margin: 0 0 0.8rem;
  font-size: clamp(2.4rem, 5vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  background: linear-gradient(180deg, #ffffff 0%, #d7dee8 30%, #8d96a5 52%, #f3f6f9 72%, #a8b1be 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

h2 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  letter-spacing: -0.02em;
}

h3 {
  margin: 0 0 0.45rem;
  font-size: 1.08rem;
}

.lead,
p {
  margin: 0 0 1rem;
}

.lead {
  color: #c5cdd8;
  max-width: 42rem;
}

.acts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 1.2rem 0 1.6rem;
}

.chrome-btn,
.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.7rem;
  padding: 0.55rem 1.2rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 650;
}

.chrome-btn {
  color: #111318;
  background: linear-gradient(180deg, #ffffff 0%, #c9d1dc 36%, #7f8896 68%, #e8edf3 100%);
  box-shadow: inset 0 1px 0 #fff, 0 10px 24px rgba(0, 0, 0, 0.32);
}

.chrome-btn:hover {
  color: #0a0c10;
}

.ghost-btn {
  color: var(--ink);
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: rgba(255, 255, 255, 0.04);
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
}

.metric {
  padding: 0.85rem 0.9rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.02));
}

.metric strong {
  display: block;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.metric span {
  color: var(--mute);
  font-size: 0.86rem;
}

.mercury-frame {
  position: relative;
  margin: 0;
  padding: 0.7rem;
  border-radius: 1.4rem;
  background: linear-gradient(160deg, #f3f6f9, #8d96a4 42%, #1b1f27 78%, #d5dce6);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.mercury-frame img {
  display: block;
  width: 100%;
  border-radius: 0.95rem;
  background: #11141a;
}

.mercury-frame figcaption {
  display: flex;
  justify-content: space-between;
  margin-top: 0.55rem;
  color: #1a1d24;
  font-size: 0.78rem;
}

.mirror {
  position: relative;
}

.mirror::after {
  content: "";
  display: block;
  height: 72px;
  margin-top: 0.35rem;
  border-radius: 0 0 1rem 1rem;
  background: linear-gradient(180deg, rgba(201, 210, 222, 0.28), transparent);
  filter: blur(0.3px);
}

section {
  padding: 3.2rem 0;
}

.head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 1rem;
  margin-bottom: 1.4rem;
}

.head p {
  max-width: 28rem;
  color: var(--mute);
  margin: 0;
}

.plate,
.ingot,
.entry,
.step,
.note {
  position: relative;
  padding: 1.15rem 1.15rem 1.2rem;
  border-radius: 1.15rem;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.07), rgba(20, 23, 30, 0.9)),
    linear-gradient(135deg, transparent 40%, rgba(255, 255, 255, 0.05));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.entry,
.plate,
.ingot,
.step,
.note,
[data-rise] {
  opacity: 1;
  transform: none;
}

.allow-motion [data-rise] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.allow-motion [data-rise].is-in {
  opacity: 1;
  transform: none;
}

.idx {
  display: inline-block;
  margin-bottom: 0.4rem;
  color: var(--silver);
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

.entry {
  text-decoration: none;
  color: inherit;
  display: block;
}

.entry:hover,
.plate:hover,
.ingot:hover {
  border-color: rgba(255, 255, 255, 0.28);
}

.entry .meta {
  color: var(--mute);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.checks {
  margin: 0;
  padding-left: 1.1rem;
  color: #c8d0db;
}

.checks li + li {
  margin-top: 0.4rem;
}

.page-hero {
  padding: 3.2rem 0 1.6rem;
}

.crumbs {
  color: var(--mute);
  font-size: 0.88rem;
}

.crumbs a {
  color: var(--silver);
}

.cues {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.8rem;
}

.cue {
  display: grid;
  gap: 0.15rem;
  padding: 0.9rem 1rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  background: rgba(255, 255, 255, 0.03);
}

.cue.is-live,
.cue:hover {
  border-color: rgba(255, 255, 255, 0.32);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.02));
}

.cue .n {
  color: var(--silver);
  font-size: 0.75rem;
}

.cue .t {
  font-weight: 650;
}

.cue .h {
  color: var(--mute);
  font-size: 0.86rem;
}

.table-wrap {
  overflow-x: auto;
  border-radius: 1rem;
  border: 1px solid var(--line);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.03);
}

th,
td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  color: var(--silver);
  font-weight: 650;
}

.faq details {
  margin-bottom: 0.7rem;
  border-radius: 1rem;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
}

.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 0.95rem 1.1rem;
  font-weight: 650;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq details p {
  margin: 0;
  padding: 0 1.1rem 1rem;
  color: #c5cdd8;
}

.cite {
  margin-top: 1.2rem;
  color: var(--mute);
  font-size: 0.95rem;
}

.site-foot {
  padding: 2.6rem 0 1.6rem;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, #10131a, #090b0f);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.8fr 0.8fr 1fr;
  gap: 1.4rem;
}

.site-foot h3 {
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--silver);
}

.site-foot ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-foot li + li {
  margin-top: 0.35rem;
}

.legal {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 1.6rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: var(--mute);
  font-size: 0.86rem;
}

.sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

@media (max-width: 980px) {
  .hero-grid,
  .duo,
  .flow-4,
  .cues,
  .foot-grid {
    grid-template-columns: 1fr 1fr;
  }

  .metric-row,
  .flow-3 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .nav-switch {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    inset: 4.6rem 1rem auto;
    display: none;
    padding: 0.8rem;
    border-radius: 1.1rem;
    border: 1px solid var(--line);
    background: rgba(12, 14, 19, 0.96);
  }

  .site-nav.is-open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-grid,
  .duo,
  .flow-4,
  .flow-2,
  .cues,
  .foot-grid,
  .alloy-bar-inner,
  .legal,
  .head {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .orb,
  .allow-motion [data-rise],
  .chrome-btn,
  .ghost-btn {
    animation: none !important;
    transition: none !important;
    filter: none;
    opacity: 1;
    transform: none;
  }
}

.allow-motion .orb-a {
  animation: morph-a 16s ease-in-out infinite;
}

.allow-motion .orb-b {
  animation: morph-b 18s ease-in-out infinite;
}

.allow-motion .orb-c {
  animation: morph-c 14s ease-in-out infinite;
}

@keyframes morph-a {
  50% {
    border-radius: 58% 42% 40% 60% / 52% 60% 40% 48%;
    transform: translate(18px, 12px);
  }
}

@keyframes morph-b {
  50% {
    border-radius: 40% 60% 58% 42% / 44% 38% 62% 56%;
    transform: translate(-14px, 16px);
  }
}

@keyframes morph-c {
  50% {
    border-radius: 62% 38% 48% 52% / 40% 58% 42% 60%;
    transform: translate(10px, -12px);
  }
}