:root {
  --ink: #101827;
  --muted: #667085;
  --line: #e4e9f2;
  --surface: #ffffff;
  --canvas: #f6f8fc;
  --navy: #07152f;
  --navy-2: #0a2148;
  --blue: #2867f0;
  --orange: #f97316;
  --green: #16a36a;
  --red: #ed4c52;
  --amber: #f59e0b;
  --shadow: 0 16px 45px rgba(28, 47, 77, 0.08);
  --radius-xl: 26px;
  --radius-lg: 20px;
  --radius-md: 15px;
  --shell: 1440px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 10% 2%, rgba(249, 115, 22, 0.045), transparent 24rem),
    radial-gradient(circle at 92% 12%, rgba(40, 103, 240, 0.06), transparent 30rem),
    var(--canvas);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  line-height: 1.55;
  overflow-x: hidden;
}

button,
a {
  font: inherit;
}

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

.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;
}

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 16px;
  border-radius: 10px;
  color: #fff;
  background: var(--navy);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(calc(100% - 48px), var(--shell));
  margin-inline: auto;
}

.section-anchor {
  scroll-margin-top: 90px;
}

.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  height: 76px;
  border-bottom: 1px solid rgba(217, 224, 236, 0.9);
  background: rgba(255, 255, 255, 0.93);
  backdrop-filter: blur(18px);
}

.nav-shell {
  display: grid;
  grid-template-columns: 220px 1fr auto;
  align-items: center;
  height: 100%;
  gap: 26px;
}

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  width: fit-content;
  border-radius: 8px;
}

.brand:focus-visible,
.primary-navigation a:focus-visible,
.menu-toggle:focus-visible,
.text-link:focus-visible,
.explore-card:focus-visible,
.mybtc-cta:focus-visible {
  outline: 3px solid rgba(40, 103, 240, 0.35);
  outline-offset: 4px;
}

.brand-crop {
  position: relative;
  display: block;
  width: 210px;
  height: 46px;
  overflow: hidden;
  background: #fff;
}

.brand-crop img {
  position: absolute;
  top: -25px;
  left: -4px;
  width: 220px;
  max-width: none;
}

.primary-navigation {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(20px, 2.4vw, 42px);
  font-size: 15px;
  font-weight: 650;
  color: #4d596c;
}

.primary-navigation a {
  position: relative;
  padding: 27px 0 24px;
  transition: color 180ms ease;
}

.primary-navigation a::after {
  position: absolute;
  right: 0;
  bottom: 18px;
  left: 0;
  height: 2px;
  border-radius: 99px;
  content: "";
  background: var(--orange);
  transform: scaleX(0);
  transition: transform 180ms ease;
}

.primary-navigation a:hover,
.primary-navigation a.is-active {
  color: var(--ink);
}

.primary-navigation a.is-active::after {
  transform: scaleX(1);
}

.prototype-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid #f1d7c4;
  border-radius: 999px;
  color: #9a4b15;
  background: #fff7ed;
  font-size: 12px;
  font-weight: 700;
  white-space: nowrap;
}

.prototype-badge i {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(249, 115, 22, 0.12);
}

.menu-toggle {
  display: none;
}

.hero {
  position: relative;
  padding: 54px 0 44px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(340px, 0.58fr) minmax(650px, 1fr);
  align-items: stretch;
  gap: 38px;
}

.hero-copy {
  display: flex;
  min-width: 0;
  padding: 30px 6px 18px;
  flex-direction: column;
  justify-content: center;
}

.eyebrow,
.section-index,
.panel-kicker {
  margin: 0;
  color: #788599;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.eyebrow span {
  color: var(--orange);
}

.hero h1 {
  margin: 18px 0 10px;
  font-size: clamp(34px, 3vw, 44px);
  line-height: 1.08;
  letter-spacing: -0.055em;
}

.hero h1 span {
  color: var(--blue);
}

.english-line {
  margin: 0 0 28px;
  color: #222a37;
  font-size: clamp(19px, 1.45vw, 25px);
  font-weight: 730;
  letter-spacing: -0.03em;
}

.english-line strong {
  color: var(--orange);
}

.hero-principles {
  margin: 4px 0 30px;
  padding-left: 17px;
  border-left: 3px solid var(--orange);
  color: #3c4758;
}

.hero-principles p {
  margin: 2px 0;
  font-size: 16px;
}

.update-row {
  display: flex;
  width: fit-content;
  max-width: 100%;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: #6b778a;
  background: rgba(255, 255, 255, 0.72);
  font-size: 12px;
  box-shadow: 0 8px 20px rgba(29, 48, 79, 0.04);
}

.clock-icon {
  color: var(--blue);
  font-size: 18px;
}

.mock-label {
  padding-left: 9px;
  border-left: 1px solid var(--line);
  color: var(--orange);
  font-weight: 760;
}

.conclusion-panel {
  position: relative;
  min-width: 0;
  min-height: 465px;
  padding: clamp(30px, 3vw, 48px);
  overflow: hidden;
  border: 1px solid rgba(111, 154, 228, 0.18);
  border-radius: var(--radius-xl);
  color: #fff;
  background:
    radial-gradient(circle at 86% 36%, rgba(40, 103, 240, 0.28), transparent 30%),
    radial-gradient(circle at 70% 100%, rgba(249, 115, 22, 0.11), transparent 35%),
    linear-gradient(135deg, #07152f 0%, #081b3d 55%, #06132a 100%);
  box-shadow: 0 28px 70px rgba(7, 21, 47, 0.24);
}

.panel-grid {
  position: absolute;
  inset: 0;
  opacity: 0.13;
  background-image:
    linear-gradient(rgba(133, 165, 219, 0.2) 1px, transparent 1px),
    linear-gradient(90deg, rgba(133, 165, 219, 0.2) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: linear-gradient(to left, #000, transparent 68%);
}

.orbital {
  position: absolute;
  border: 1px solid rgba(102, 153, 255, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.orbital::after {
  position: absolute;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  content: "";
  background: var(--blue);
  box-shadow: 0 0 18px rgba(85, 139, 255, 0.9);
}

.orbital-one {
  top: -80px;
  right: -90px;
  width: 350px;
  height: 350px;
}

.orbital-one::after {
  top: 78px;
  left: 28px;
}

.orbital-two {
  top: 20px;
  right: -25px;
  width: 250px;
  height: 250px;
}

.orbital-two::after {
  right: 22px;
  bottom: 50px;
  background: var(--orange);
}

.conclusion-heading,
.conclusion-statement,
.conclusion-delta,
.conclusion-signals {
  position: relative;
  z-index: 1;
}

.conclusion-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.conclusion-heading .panel-kicker {
  color: #7fa9ff;
}

.conclusion-heading h2 {
  margin: 7px 0 4px;
  font-size: clamp(25px, 2vw, 34px);
  letter-spacing: -0.035em;
}

.conclusion-heading p:last-child {
  margin: 0;
  color: #91a0b8;
  font-size: 13px;
}

.confidence {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 10px;
  border: 1px solid rgba(70, 214, 151, 0.22);
  border-radius: 999px;
  color: #8ae4b9;
  background: rgba(17, 141, 89, 0.1);
  font-size: 11px;
  font-weight: 750;
  white-space: nowrap;
}

.confidence i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #54d69b;
  box-shadow: 0 0 0 4px rgba(84, 214, 155, 0.1);
}

.conclusion-statement {
  max-width: 790px;
  margin: clamp(42px, 5vw, 68px) 0 24px;
  font-size: clamp(32px, 3.25vw, 52px);
  font-weight: 830;
  line-height: 1.28;
  letter-spacing: -0.045em;
}

.conclusion-statement span,
.conclusion-statement strong {
  display: block;
}

.conclusion-statement span {
  color: #fff;
}

.conclusion-delta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 24px;
}

.conclusion-delta div {
  padding: 9px 11px;
  border: 1px solid rgba(154, 183, 230, 0.13);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.035);
}

.conclusion-delta small,
.conclusion-delta b {
  display: block;
}

.conclusion-delta small {
  color: #71839f;
  font-size: 8px;
  font-weight: 760;
  letter-spacing: 0.06em;
}

.conclusion-delta b {
  margin-top: 2px;
  color: #c8d2e2;
  font-size: 10px;
}

.conclusion-statement span::first-letter {
  color: inherit;
}

.conclusion-statement strong {
  color: #ff7379;
}

.conclusion-statement span {
  background: linear-gradient(90deg, #fff 0 50%, #7de1b3 50% 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.conclusion-signals {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  padding-top: 27px;
  border-top: 1px solid rgba(160, 185, 230, 0.15);
}

.story-rail {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(13px, 2vw, 28px);
  margin-top: 25px;
  padding: 13px 18px;
  border: 1px solid rgba(218, 225, 236, 0.88);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 9px 28px rgba(31, 49, 80, 0.045);
}

.story-rail a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #4d596b;
  font-size: 11px;
  font-weight: 720;
}

.story-rail a:hover span {
  color: var(--blue);
}

.story-rail small {
  color: var(--orange);
  font-size: 8px;
  font-weight: 850;
}

.story-rail i {
  color: #bdc6d2;
  font-size: 10px;
  font-style: normal;
}

.signal {
  display: grid;
  grid-template-columns: 28px 1fr;
  align-items: start;
  gap: 11px;
  min-width: 0;
}

.signal-icon {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  font-size: 13px;
  font-weight: 900;
}

.signal-support { color: #58d89b; }
.signal-risk { color: #ff7379; }
.signal-watch { color: #f9b34b; }

.signal b {
  display: block;
  margin-bottom: 3px;
  color: #f4f7fb;
  font-size: 13px;
}

.signal p {
  margin: 0;
  color: #8f9eb5;
  font-size: 11px;
  line-height: 1.55;
}

.content-section {
  padding: 72px 0;
}

.content-section:nth-of-type(odd) {
  background: rgba(255, 255, 255, 0.5);
}

.section-heading {
  margin-bottom: 28px;
}

.heading-split {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
}

.section-index {
  margin-bottom: 7px;
  color: var(--blue);
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(28px, 2.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.045em;
}

.section-heading p:not(.section-index) {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 15px;
}

.logic-key {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: #7a8595;
  background: #fff;
  font-size: 12px;
  box-shadow: 0 7px 20px rgba(29, 48, 79, 0.04);
}

.logic-key i {
  color: #b3bdcb;
  font-style: normal;
}

.logic-key strong {
  color: var(--orange);
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}

.evidence-card,
.change-card {
  min-width: 0;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 10px 32px rgba(33, 52, 84, 0.055);
  animation: rise 520ms ease both;
  animation-delay: var(--delay);
}

.evidence-card {
  position: relative;
  padding: 18px 16px 15px;
  overflow: hidden;
  border-radius: var(--radius-md);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.evidence-card::before {
  position: absolute;
  top: 0;
  right: 18px;
  left: 18px;
  height: 2px;
  border-radius: 99px;
  content: "";
  background: var(--tone);
}

.evidence-card:hover {
  border-color: #ced7e5;
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.tone-support { --tone: var(--green); }
.tone-risk { --tone: var(--red); }
.tone-watch { --tone: var(--amber); }
.tone-positive { --tone: var(--green); }
.tone-negative { --tone: var(--red); }

.card-topline,
.metric-row,
.change-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 9px;
}

.dimension-symbol,
.change-title span,
.explore-symbol {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 10px;
  color: var(--tone);
  background: color-mix(in srgb, var(--tone) 10%, white);
  font-size: 12px;
  font-weight: 850;
}

.stance-label {
  color: var(--tone);
  font-size: 10px;
  font-weight: 780;
}

.evidence-card h3 {
  margin: 13px 0 9px;
  font-size: 17px;
}

.metric-row {
  align-items: baseline;
  margin-bottom: 14px;
  padding-bottom: 13px;
  border-bottom: 1px solid #edf0f5;
}

.metric-row span {
  color: #7a8595;
  font-size: 10px;
}

.metric-row strong {
  color: var(--tone);
  font-size: 16px;
}

.evidence-card dl,
.evidence-card dl div {
  margin: 0;
}

.evidence-card dl div {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 6px;
  margin-bottom: 7px;
}

.evidence-card dt {
  color: #98a2b2;
  font-size: 10px;
  font-weight: 750;
}

.evidence-card dd {
  margin: 0;
  color: #4e5a6b;
  font-size: 10px;
  line-height: 1.55;
}

.evidence-card dl div:last-child dd {
  color: var(--tone);
  font-weight: 760;
}

.sparkline {
  display: block;
  width: 100%;
  height: 42px;
  margin-top: 10px;
  color: var(--ink);
  overflow: visible;
}

.section-note {
  margin: 14px 0 0;
  color: #919aaa;
  font-size: 11px;
}

.changes-section {
  border-block: 1px solid #e9edf4;
  background: #fff;
}

.text-link {
  color: var(--blue);
  font-size: 13px;
  font-weight: 750;
}

.text-link span {
  display: inline-block;
  transition: transform 180ms ease;
}

.text-link:hover span {
  transform: translateX(4px);
}

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

.change-card {
  position: relative;
  display: grid;
  grid-template-columns: 145px 150px minmax(180px, 1fr) auto;
  align-items: center;
  gap: 18px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.change-card::before {
  position: absolute;
  top: 15px;
  bottom: 15px;
  left: 0;
  width: 3px;
  border-radius: 99px;
  content: "";
  background: var(--tone);
}

.change-title {
  justify-content: flex-start;
}

.change-title h3 {
  margin: 0;
  font-size: 13px;
}

.change-value {
  display: block;
  margin: 12px 0 2px;
  color: var(--tone);
  font-size: 20px;
  letter-spacing: -0.03em;
}

.change-delta {
  margin: 0;
  color: #8b95a4;
  font-size: 10px;
}

.change-reason {
  min-height: 0;
  margin: 0;
  padding: 11px 13px;
  border-radius: 9px;
  color: #697588;
  background: #f7f9fc;
  font-size: 10px;
  line-height: 1.5;
}

.change-trend .sparkline {
  height: 46px;
  margin: 0;
}

.change-effect {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 92px;
  padding: 8px 10px;
  border: 1px solid color-mix(in srgb, var(--tone) 20%, white);
  border-radius: 999px;
  color: var(--tone);
  background: color-mix(in srgb, var(--tone) 7%, white);
  font-size: 10px;
  font-weight: 800;
  white-space: nowrap;
}

.change-reason b {
  display: block;
  margin-bottom: 2px;
  color: var(--tone);
  font-size: 9px;
}

.certainty-section {
  background: linear-gradient(180deg, #f5f8fc 0%, #f8fafc 100%);
}

.certainty-layout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr)) 0.88fr;
  gap: 14px;
}

.certainty-card,
.principle-card {
  border-radius: var(--radius-lg);
}

.certainty-card {
  padding: 23px;
  border: 1px solid var(--card-line);
  background: var(--card-bg);
}

.known-card {
  --card-bg: linear-gradient(145deg, #f0fbf6, #f8fdfb);
  --card-line: #d7eee3;
  --card-tone: var(--green);
}

.unknown-card {
  --card-bg: linear-gradient(145deg, #fff4f4, #fffafa);
  --card-line: #f2dddd;
  --card-tone: var(--red);
}

.watch-card {
  --card-bg: linear-gradient(145deg, #fff9ec, #fffdf8);
  --card-line: #f0e4c6;
  --card-tone: var(--amber);
}

.certainty-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 17px;
}

.certainty-title > span {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--card-tone);
  font-size: 17px;
  font-weight: 900;
  box-shadow: 0 7px 20px color-mix(in srgb, var(--card-tone) 22%, transparent);
}

.certainty-title small {
  color: var(--card-tone);
  font-size: 9px;
  font-weight: 850;
  letter-spacing: 0.12em;
}

.certainty-title h3 {
  margin: 1px 0 0;
  font-size: 16px;
}

.certainty-card ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.certainty-card li {
  position: relative;
  margin: 0 0 11px;
  padding-left: 17px;
  color: #536071;
  font-size: 11px;
  line-height: 1.6;
}

.certainty-card li::before {
  position: absolute;
  top: 0.65em;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  content: "";
  background: var(--card-tone);
}

.principle-card {
  padding: 24px;
  color: #fff;
  background: linear-gradient(145deg, #0a1b39, #0b2851);
  box-shadow: 0 20px 40px rgba(7, 21, 47, 0.14);
}

.principle-card .panel-kicker {
  color: #7399dc;
}

.principle-card h3 {
  margin: 8px 0 18px;
  font-size: 18px;
  line-height: 1.4;
}

.principle-card ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.principle-card li {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 9px 0;
  border-bottom: 1px solid rgba(166, 190, 231, 0.1);
  color: #bfcaDC;
  font-size: 11px;
}

.principle-card li span {
  color: #6e9df2;
  font-size: 9px;
  font-weight: 850;
}

.principle-card > p:last-child {
  margin: 18px 0 0;
  color: #f4a35d;
  font-size: 11px;
  font-weight: 720;
}

.reassessment-card {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) 2fr;
  gap: 28px;
  margin-top: 15px;
  padding: 24px 27px;
  border: 1px solid #d9e2ef;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.86);
  box-shadow: 0 10px 28px rgba(31, 49, 80, 0.04);
}

.reassessment-heading {
  display: flex;
  align-items: center;
  gap: 13px;
}

.reassessment-heading > span {
  display: grid;
  width: 40px;
  height: 40px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 12px;
  color: var(--blue);
  background: #edf3ff;
  font-size: 20px;
  font-weight: 900;
}

.reassessment-heading small {
  color: var(--blue);
  font-size: 8px;
  font-weight: 850;
  letter-spacing: 0.11em;
}

.reassessment-heading h3 {
  margin: 3px 0 0;
  font-size: 15px;
  line-height: 1.4;
}

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

.reassessment-triggers p {
  margin: 0;
  padding: 11px 13px;
  border-left: 2px solid var(--red);
  color: #687486;
  background: #f8fafc;
  font-size: 10px;
}

.reassessment-triggers b,
.reassessment-triggers span {
  display: block;
}

.reassessment-triggers b {
  margin-bottom: 3px;
  color: #313c4d;
  font-size: 11px;
}

.explore-section {
  background: #fff;
}

.verify-statement {
  color: var(--ink) !important;
  font-size: 16px !important;
  font-weight: 750;
}

.verify-statement span {
  color: var(--orange);
}

.explore-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 13px;
}

.explore-card {
  display: grid;
  grid-template-columns: 42px 1fr;
  align-items: start;
  gap: 13px;
  padding: 21px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #fff;
  transition: transform 180ms ease, border-color 180ms ease, box-shadow 180ms ease;
}

.explore-card:hover {
  border-color: #cfd9e8;
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.explore-symbol {
  width: 42px;
  height: 42px;
  color: var(--blue);
  background: #edf3ff;
  font-size: 18px;
}

.explore-card h3 {
  margin: 0 0 3px;
  font-size: 15px;
}

.explore-card p {
  min-height: 34px;
  margin: 0 0 9px;
  color: #7a8595;
  font-size: 10px;
}

.explore-card b {
  color: var(--blue);
  font-size: 10px;
}

.mybtc-section {
  padding: 0 0 40px;
  background: #fff;
}

.mybtc-panel {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr auto;
  align-items: center;
  gap: clamp(28px, 4vw, 66px);
  padding: 42px 48px;
  overflow: hidden;
  border-radius: var(--radius-xl);
  color: #fff;
  background:
    radial-gradient(circle at 85% 30%, rgba(40, 103, 240, 0.28), transparent 27%),
    linear-gradient(120deg, #07142d, #0a2247 70%, #091a36);
  box-shadow: 0 25px 60px rgba(7, 21, 47, 0.17);
}

.mybtc-copy .panel-kicker {
  color: #7198df;
}

.mybtc-copy h2 {
  margin: 8px 0 11px;
  font-size: clamp(27px, 2.5vw, 39px);
  line-height: 1.25;
  letter-spacing: -0.045em;
}

.mybtc-copy p:last-child {
  max-width: 630px;
  margin: 0;
  color: #9eabc0;
  font-size: 12px;
}

.boundary-flow {
  display: flex;
  align-items: center;
  gap: 14px;
}

.boundary-flow div {
  min-width: 130px;
  padding: 13px 15px;
  border: 1px solid rgba(150, 180, 230, 0.16);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.04);
}

.boundary-flow small,
.boundary-flow b,
.boundary-flow span {
  display: block;
}

.boundary-flow small {
  color: #6f9df0;
  font-size: 9px;
  font-weight: 800;
}

.boundary-flow b {
  margin: 3px 0;
  font-size: 13px;
}

.boundary-flow span {
  color: #8d9bb0;
  font-size: 9px;
}

.boundary-flow i {
  color: var(--orange);
  font-style: normal;
}

.mybtc-cta {
  display: grid;
  grid-template-columns: 1fr auto;
  min-width: 178px;
  padding: 16px 18px;
  border-radius: 14px;
  color: #fff;
  background: linear-gradient(135deg, #f97316, #ff8d3c);
  box-shadow: 0 14px 30px rgba(249, 115, 22, 0.28);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.mybtc-cta:hover {
  box-shadow: 0 18px 36px rgba(249, 115, 22, 0.34);
  transform: translateY(-3px);
}

.mybtc-cta span {
  font-size: 14px;
  font-weight: 820;
}

.mybtc-cta b {
  font-size: 18px;
}

.mybtc-cta small {
  grid-column: 1 / -1;
  margin-top: 2px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 9px;
}

.site-footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  background: #f8fafc;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 38px;
}

.footer-brand {
  display: inline-flex;
  align-items: baseline;
  font-size: 20px;
  font-weight: 900;
  font-style: italic;
  letter-spacing: -0.055em;
}

.footer-brand b { color: var(--orange); }
.footer-brand i { color: #5d6572; font-style: italic; }

.footer-grid > div:first-child p,
.footer-grid > p {
  margin: 3px 0 0;
  color: #929baa;
  font-size: 10px;
}

.footer-links {
  display: flex;
  gap: 24px;
  color: #737f90;
  font-size: 11px;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(9px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1380px) {
  .changes-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 1180px) {
  .nav-shell {
    grid-template-columns: 210px 1fr auto;
    gap: 12px;
  }

  .primary-navigation {
    gap: 18px;
    font-size: 13px;
  }

  .hero-grid {
    grid-template-columns: 0.7fr 1.3fr;
    gap: 24px;
  }

  .conclusion-signals {
    gap: 12px;
  }

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

  .changes-grid {
    grid-template-columns: 1fr;
  }

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

  .principle-card {
    grid-column: 1 / -1;
  }

  .principle-card ol {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 18px;
  }

  .mybtc-panel {
    grid-template-columns: 1fr auto;
  }

  .reassessment-card {
    grid-template-columns: 1fr;
  }

  .boundary-flow {
    display: none;
  }
}

@media (max-width: 920px) {
  .site-header {
    height: 70px;
  }

  .nav-shell {
    grid-template-columns: 1fr auto auto;
  }

  .brand-crop {
    width: 188px;
    height: 42px;
  }

  .brand-crop img {
    width: 200px;
    top: -22px;
  }

  .menu-toggle {
    display: grid;
    width: 42px;
    height: 42px;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 11px;
    place-content: center;
    gap: 4px;
    background: #fff;
  }

  .menu-toggle span:not(.sr-only) {
    display: block;
    width: 18px;
    height: 2px;
    border-radius: 99px;
    background: var(--ink);
  }

  .primary-navigation {
    position: absolute;
    top: 69px;
    right: 24px;
    left: 24px;
    display: none;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 16px;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow);
  }

  .primary-navigation.is-open {
    display: flex;
  }

  .primary-navigation a {
    padding: 12px 14px;
    border-radius: 9px;
  }

  .primary-navigation a::after {
    display: none;
  }

  .primary-navigation a.is-active {
    color: var(--blue);
    background: #f1f5ff;
  }

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

  .hero-copy {
    padding-bottom: 4px;
  }

  .conclusion-panel {
    min-height: auto;
  }

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

  .mybtc-panel {
    padding: 36px;
  }

  .footer-grid {
    grid-template-columns: 1fr auto;
  }

  .footer-grid > p {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .shell {
    width: min(calc(100% - 30px), var(--shell));
  }

  .prototype-badge {
    display: none;
  }

  .nav-shell {
    grid-template-columns: 1fr auto;
  }

  .hero {
    padding: 30px 0 26px;
  }

  .conclusion-panel {
    order: -1;
  }

  .hero h1 {
    font-size: clamp(34px, 10vw, 42px);
  }

  .english-line {
    font-size: 18px;
  }

  .update-row {
    align-items: flex-start;
    flex-wrap: wrap;
  }

  .mock-label {
    width: 100%;
    padding: 5px 0 0 27px;
    border: 0;
  }

  .conclusion-panel {
    padding: 25px 21px;
    border-radius: 20px;
  }

  .conclusion-heading {
    display: block;
  }

  .confidence {
    margin-top: 12px;
  }

  .conclusion-statement {
    margin: 38px 0 30px;
    font-size: clamp(30px, 9vw, 40px);
  }

  .conclusion-delta {
    grid-template-columns: 1fr;
  }

  .conclusion-signals {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .content-section {
    padding: 54px 0;
  }

  .heading-split {
    display: block;
  }

  .logic-key,
  .text-link,
  .verify-statement {
    width: fit-content;
    margin-top: 16px !important;
  }

  .evidence-grid,
  .changes-grid,
  .certainty-layout,
  .explore-grid {
    grid-template-columns: 1fr;
  }

  .story-rail {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .story-rail a {
    padding: 7px 9px;
    border-radius: 8px;
    background: #f7f9fc;
  }

  .story-rail i {
    display: none;
  }

  .change-card {
    grid-template-columns: 1fr auto;
    gap: 12px;
  }

  .change-trend {
    grid-column: 2;
    grid-row: 1;
    width: 110px;
  }

  .change-reason {
    grid-column: 1 / -1;
  }

  .change-effect {
    grid-column: 1 / -1;
    width: fit-content;
  }

  .reassessment-card {
    padding: 21px;
  }

  .reassessment-triggers {
    grid-template-columns: 1fr;
  }

  .evidence-card {
    padding: 20px;
  }

  .evidence-card dl div {
    grid-template-columns: 36px 1fr;
  }

  .evidence-card dd,
  .evidence-card dt,
  .change-reason {
    font-size: 11px;
  }

  .certainty-card,
  .principle-card {
    padding: 21px;
  }

  .principle-card {
    grid-column: auto;
  }

  .principle-card ol {
    display: block;
  }

  .explore-card p {
    min-height: 0;
  }

  .mybtc-section {
    padding-bottom: 22px;
  }

  .mybtc-panel {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 28px 22px;
    border-radius: 20px;
  }

  .mybtc-cta {
    width: 100%;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .footer-links {
    flex-wrap: wrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}