:root {
  color-scheme: light;
  --paper: #f5efe3;
  --paper-deep: #ebe0cf;
  --surface: #fbf7ee;
  --surface-strong: #fffdf8;
  --ink: #1f1a16;
  --ink-soft: #5e554d;
  --line: #cfc1af;
  --line-strong: #9d8d7c;
  --signal: #a92f20;
  --signal-dark: #762016;
  --success: #246a4a;
  --gold: #b17828;
  --shadow: 0 22px 60px rgb(45 34 24 / 0.12);
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --sans: Inter, "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  --content: min(1180px, calc(100vw - 48px));
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 86% 10%, rgb(169 47 32 / 0.08), transparent 25rem),
    linear-gradient(180deg, var(--paper) 0%, #f8f2e8 42%, var(--paper) 100%);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: url("data:image/svg+xml,%3Csvg width='96' height='96' viewBox='0 0 96 96' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M0 95.5h96' stroke='%23665748' stroke-opacity='.05'/%3E%3C/svg%3E");
  content: "";
  pointer-events: none;
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  border: 1px solid var(--ink);
  background: var(--surface-strong);
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  border-bottom: 1px solid rgb(94 85 77 / 0.22);
  background: rgb(245 239 227 / 0.92);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
}

.brand svg,
.session-actions svg,
.zoom-label svg,
.dialog-close svg,
.tool-icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.site-header nav {
  display: flex;
  gap: 28px;
}

.site-header nav a {
  position: relative;
  padding: 23px 0 19px;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.site-header nav a::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 2px;
  background: var(--signal);
  content: "";
  opacity: 0;
  transform: scaleX(0.5);
  transition: opacity 180ms ease-out, transform 180ms ease-out;
}

.site-header nav a:hover,
.site-header nav a[aria-current="true"] {
  color: var(--ink);
}

.site-header nav a:hover::after,
.site-header nav a[aria-current="true"]::after {
  opacity: 1;
  transform: scaleX(1);
}

.section-shell {
  width: var(--content);
  margin: 0 auto;
}

.hero {
  padding: 104px 0 112px;
}

.hero-copy {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.52fr);
  gap: 44px 88px;
  align-items: end;
}

.eyebrow,
.section-number,
.session-kicker,
.card-label {
  margin: 0 0 20px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: -0.045em;
}

h1 {
  max-width: 850px;
  margin-bottom: 28px;
  font-size: clamp(58px, 7.6vw, 112px);
  line-height: 1.02;
}

.hero-lead {
  max-width: 700px;
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.65;
}

.verdict {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 22px 0 4px;
  border-top: 1px solid var(--line-strong);
}

.verdict-mark {
  width: 12px;
  height: 12px;
  flex: 0 0 auto;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 6px rgb(36 106 74 / 0.12);
}

.verdict strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--serif);
  font-size: 22px;
}

.verdict p {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 72px 0 36px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.hero-metrics div {
  padding: 26px 24px 24px;
  border-right: 1px solid var(--line);
}

.hero-metrics div:last-child {
  border-right: 0;
}

.hero-metrics dt {
  margin-bottom: 8px;
  font-family: var(--serif);
  font-size: clamp(36px, 4vw, 58px);
  font-weight: 700;
  line-height: 1;
}

.hero-metrics dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

figure {
  margin: 0;
}

.image-button {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--surface);
  box-shadow: var(--shadow);
  cursor: zoom-in;
}

.image-button img {
  display: block;
  width: 100%;
  height: auto;
  transition: filter 220ms ease-out, transform 300ms ease-out;
}

.image-button:hover img {
  filter: contrast(1.02);
  transform: scale(1.005);
}

.zoom-label {
  position: absolute;
  right: 16px;
  bottom: 16px;
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid rgb(255 255 255 / 0.35);
  border-radius: 3px;
  color: #fff;
  background: rgb(31 26 22 / 0.78);
  font-size: 13px;
  font-weight: 600;
  backdrop-filter: blur(8px);
}

.zoom-label svg {
  width: 18px;
  height: 18px;
}

figcaption {
  margin-top: 14px;
  color: var(--ink-soft);
  font-size: 13px;
}

.session,
.how,
.skill-section {
  padding: 112px 0;
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.65fr);
  column-gap: 72px;
  align-items: end;
  margin-bottom: 54px;
}

.section-heading .section-number {
  grid-column: 1 / -1;
}

.section-heading h2 {
  max-width: 780px;
  margin-bottom: 0;
  font-size: clamp(44px, 5.7vw, 78px);
  line-height: 1.08;
}

.section-heading > p:last-child {
  margin-bottom: 8px;
  color: var(--ink-soft);
  font-size: 17px;
}

.session-frame {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 5px;
  background: rgb(251 247 238 / 0.78);
  box-shadow: 0 18px 50px rgb(45 34 24 / 0.08);
}

.session-bar {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  padding: 24px 26px;
  border-bottom: 1px solid var(--line);
}

.session-bar .session-kicker {
  display: block;
  margin-bottom: 3px;
  font-size: 10px;
}

.session-bar strong {
  font-family: var(--serif);
  font-size: 22px;
}

.session-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.session-actions a,
.copy-button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--ink);
  background: transparent;
  font-size: 12px;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
  transition: border-color 180ms ease-out, background 180ms ease-out;
}

.session-actions a:hover,
.copy-button:hover {
  border-color: var(--ink);
  background: var(--surface-strong);
}

.session-actions svg {
  width: 16px;
  height: 16px;
}

.session-meta {
  display: grid;
  grid-template-columns: 1.35fr 0.8fr 1fr 0.95fr;
  margin: 0;
  border-bottom: 1px solid var(--line);
  background: rgb(235 224 207 / 0.36);
}

.session-meta div {
  min-width: 0;
  padding: 16px 18px;
  border-right: 1px solid var(--line);
}

.session-meta div:last-child {
  border-right: 0;
}

.session-meta dt {
  margin-bottom: 3px;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.session-meta dd {
  overflow: hidden;
  margin: 0;
  font-family: var(--mono);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.status-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 5px;
  border-radius: 50%;
  background: var(--success);
}

.transcript {
  padding: 38px 30px 50px;
}

.message {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 16px;
  max-width: 930px;
  margin: 0 auto 20px;
}

.message-role {
  padding-top: 16px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-align: right;
  text-transform: uppercase;
}

.message-body {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 4px 14px 14px 14px;
  background: var(--surface-strong);
}

.message-body > :last-child {
  margin-bottom: 0;
}

.message-user .message-body {
  background: #efe4d1;
}

.message-body blockquote {
  margin: 12px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--signal);
  color: var(--ink-soft);
}

.message-event .message-body {
  border-color: rgb(36 106 74 / 0.35);
  background: rgb(36 106 74 / 0.08);
}

.message-event .message-role {
  color: var(--success);
}

.message-final .message-body {
  border-color: var(--line-strong);
  box-shadow: 0 12px 30px rgb(45 34 24 / 0.08);
}

.message-final h3 {
  margin: 24px 0 12px;
  font-family: var(--serif);
  font-size: 30px;
}

.direction-note {
  padding-top: 14px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 13px;
}

.tool-call {
  max-width: 838px;
  margin: 0 auto 18px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: rgb(235 224 207 / 0.32);
}

.tool-call summary {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-height: 66px;
  padding: 10px 16px;
  list-style: none;
  cursor: pointer;
}

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

.tool-call summary::after {
  position: absolute;
}

.tool-icon {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink-soft);
  background: var(--surface);
}

.tool-icon svg {
  width: 18px;
  height: 18px;
}

.tool-call summary strong,
.tool-call summary small {
  display: block;
}

.tool-call summary strong {
  font-size: 14px;
}

.tool-call summary small {
  margin-top: 2px;
  color: var(--ink-soft);
  font-size: 12px;
}

.tool-count {
  color: var(--signal);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  white-space: nowrap;
}

.tool-detail {
  padding: 4px 20px 20px 70px;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 13px;
}

.tool-detail p {
  margin: 16px 0 10px;
}

.tool-detail code {
  display: block;
  overflow-x: auto;
  padding: 10px 12px;
  border-radius: 3px;
  color: var(--ink);
  background: rgb(255 253 248 / 0.85);
  font-family: var(--mono);
  font-size: 11px;
  white-space: nowrap;
}

.flow {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin: 0 0 70px;
  padding: 0;
  list-style: none;
}

.flow::before {
  position: absolute;
  top: 28px;
  right: 12.5%;
  left: 12.5%;
  height: 1px;
  background: var(--line-strong);
  content: "";
}

.flow li {
  position: relative;
  padding: 0 24px;
  text-align: center;
}

.flow-number {
  position: relative;
  z-index: 1;
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  margin: 0 auto 22px;
  border: 1px solid var(--signal);
  border-radius: 50%;
  color: var(--signal);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
}

.flow h3 {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 25px;
}

.flow p {
  margin-bottom: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.browser-launch {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr);
  gap: 34px 54px;
  margin-bottom: 24px;
  padding: 40px;
  border: 1px solid var(--line);
  border-top: 5px solid var(--gold);
  background: var(--surface-strong);
  box-shadow: 0 16px 42px rgb(45 34 24 / 0.08);
}

.browser-launch-copy h3 {
  margin: 0 0 18px;
  font-family: var(--serif);
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.15;
}

.browser-launch-copy > p:last-child {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.browser-launch-flow {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.browser-launch-flow li {
  position: relative;
  min-width: 0;
  padding: 22px 18px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.browser-launch-flow li:not(:last-child)::after {
  position: absolute;
  top: 50%;
  right: -10px;
  z-index: 2;
  width: 18px;
  height: 18px;
  border-top: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  background: var(--paper);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.browser-launch-flow span,
.browser-launch-flow strong,
.browser-launch-flow code {
  display: block;
}

.browser-launch-flow span {
  margin-bottom: 22px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
}

.browser-launch-flow strong {
  margin-bottom: 7px;
  font-family: var(--serif);
  font-size: 20px;
}

.browser-launch-flow code {
  overflow: hidden;
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.local-server-note {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(210px, 0.5fr) 1.5fr;
  gap: 28px;
  padding: 22px 24px;
  border-left: 3px solid var(--success);
  background: rgb(36 106 74 / 0.08);
}

.local-server-note strong {
  font-family: var(--serif);
  font-size: 22px;
}

.local-server-note p {
  margin: 0;
  color: var(--ink-soft);
}

.local-server-note code {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.86em;
}

.mechanism-grid {
  display: grid;
  gap: 24px;
}

.mechanism-card {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr);
  gap: 54px;
  padding: 40px;
  color: #f8f0e5;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.heartbeat-card {
  border-top: 5px solid var(--signal);
}

.linkage-card {
  border-top: 5px solid #4f9d73;
}

.mechanism-heading .section-number {
  color: #e78772;
}

.linkage-card .mechanism-heading .section-number {
  color: #78c49b;
}

.mechanism-heading h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.15;
}

.mechanism-copy {
  color: rgb(248 240 229 / 0.82);
}

.mechanism-copy > p:first-child {
  margin-top: 0;
  font-size: 17px;
  line-height: 1.75;
}

.mechanism-copy strong,
.mechanism-copy code {
  color: #fff;
}

.mechanism-copy code {
  font-family: var(--mono);
  font-size: 0.86em;
}

.mechanism-line {
  display: grid;
  grid-template-columns: auto 1fr auto 1fr auto 1fr auto;
  gap: 12px;
  align-items: center;
  margin: 28px 0;
}

.mechanism-line span {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.mechanism-line i {
  height: 1px;
  background: rgb(248 240 229 / 0.36);
}

.mechanism-note {
  margin-bottom: 0;
  padding: 16px 18px;
  border-left: 2px solid #e78772;
  background: rgb(255 255 255 / 0.05);
  font-size: 13px;
}

.linkage-card .mechanism-note {
  border-left-color: #78c49b;
}

.skill-identity {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.identity-card {
  padding: 34px;
  border: 1px solid var(--line);
  background: rgb(251 247 238 / 0.72);
}

.identity-type {
  display: inline-block;
  margin-bottom: 22px;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.identity-card h3 {
  margin-bottom: 14px;
  font-family: var(--serif);
  font-size: 42px;
}

.identity-card p {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.identity-card code {
  font-family: var(--mono);
  font-size: 0.84em;
}

.identity-skill {
  border-top: 5px solid var(--success);
}

.identity-skill .identity-type {
  color: var(--success);
}

.identity-plugin {
  border-top: 5px solid var(--gold);
}

.identity-plugin .identity-type {
  color: #885b1c;
}

.skill-anatomy {
  display: grid;
  grid-template-columns: minmax(320px, 0.78fr) minmax(0, 1.22fr);
  gap: 0;
  margin-top: 22px;
  border: 1px solid var(--line-strong);
  background: var(--surface-strong);
  box-shadow: 0 16px 42px rgb(45 34 24 / 0.08);
}

.skill-tree-panel {
  padding: 38px;
  color: #f8f0e5;
  background: var(--ink);
}

.skill-tree-panel .section-number {
  color: #78c49b;
}

.skill-tree-panel h3 {
  margin-bottom: 28px;
  font-family: var(--serif);
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.15;
}

.skill-tree-panel pre {
  overflow-x: auto;
  margin: 0;
  padding: 22px;
  border: 1px solid rgb(248 240 229 / 0.18);
  background: rgb(255 255 255 / 0.04);
  color: rgb(248 240 229 / 0.82);
  line-height: 1.85;
}

.skill-tree-panel code {
  font-family: var(--mono);
  font-size: 12px;
}

.file-roles {
  margin: 0;
  padding: 22px 36px;
}

.file-roles > div {
  display: grid;
  grid-template-columns: minmax(210px, 0.8fr) 1.2fr;
  gap: 28px;
  padding: 19px 0;
  border-bottom: 1px solid var(--line);
}

.file-roles > div:last-child {
  border-bottom: 0;
}

.file-roles dt,
.file-roles dd {
  margin: 0;
}

.file-roles dt code,
.file-roles dt span {
  display: block;
}

.file-roles dt code {
  overflow-wrap: anywhere;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
}

.file-roles dt span {
  margin-top: 4px;
  color: var(--signal);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.file-roles dd {
  color: var(--ink-soft);
  font-size: 14px;
}

.runtime-diagram {
  display: grid;
  grid-template-columns: minmax(250px, 0.62fr) minmax(0, 1.38fr);
  gap: 54px;
  margin-top: 22px;
  padding: 42px;
  border-top: 5px solid var(--signal);
  color: #f8f0e5;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.runtime-diagram-heading .section-number {
  color: #e78772;
}

.runtime-diagram-heading h3 {
  margin-bottom: 20px;
  font-family: var(--serif);
  font-size: clamp(32px, 3.2vw, 48px);
  line-height: 1.15;
}

.runtime-diagram-heading p:last-child {
  margin-bottom: 0;
  color: rgb(248 240 229 / 0.68);
}

.runtime-diagram-heading code {
  color: #fff;
  font-family: var(--mono);
  font-size: 0.82em;
}

.runtime-sequence {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.runtime-sequence::before {
  position: absolute;
  top: 18px;
  bottom: 26px;
  left: 18px;
  width: 1px;
  background: rgb(248 240 229 / 0.24);
  content: "";
}

.runtime-sequence li {
  position: relative;
  display: grid;
  grid-template-columns: 38px minmax(190px, 0.8fr) minmax(0, 1.2fr);
  gap: 4px 18px;
  padding-bottom: 24px;
}

.runtime-step {
  z-index: 1;
  display: grid;
  width: 38px;
  height: 38px;
  grid-row: 1 / 3;
  place-items: center;
  border: 1px solid #e78772;
  border-radius: 50%;
  color: #e78772;
  background: var(--ink);
  font-family: var(--mono);
  font-size: 9px;
  font-weight: 700;
}

.runtime-sequence li > code {
  align-self: center;
  overflow-wrap: anywhere;
  color: #fff;
  font-family: var(--mono);
  font-size: 11px;
}

.runtime-sequence li > strong {
  align-self: center;
  font-family: var(--serif);
  font-size: 20px;
}

.runtime-sequence li > p {
  grid-column: 3;
  margin: 0;
  color: rgb(248 240 229 / 0.66);
  font-size: 13px;
}

.runtime-sequence li > p code {
  color: rgb(248 240 229 / 0.88);
  font-family: var(--mono);
  font-size: 0.82em;
}

.runtime-system-step .runtime-step {
  border-color: #e2b564;
  color: #e2b564;
}

.runtime-system-step > code {
  color: #e2b564 !important;
}

.runtime-final-step .runtime-step {
  border-color: #78c49b;
  color: #78c49b;
}

.runtime-final-step > code {
  color: #78c49b !important;
}

.runtime-portability {
  display: grid;
  grid-template-columns: minmax(220px, 0.58fr) minmax(280px, 0.72fr) minmax(0, 1fr);
  gap: 28px 44px;
  align-items: start;
  margin-top: 22px;
  padding: 32px 36px;
  border: 1px solid var(--line);
  border-left: 5px solid var(--gold);
  background: var(--surface-strong);
}

.runtime-portability .section-number {
  margin-bottom: 0;
}

.runtime-portability h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(26px, 2.4vw, 36px);
  line-height: 1.2;
}

.runtime-portability > p:last-child {
  margin: 0;
  color: var(--ink-soft);
}

.dependency-card {
  display: grid;
  grid-template-columns: minmax(240px, 0.7fr) 1.3fr;
  gap: 54px;
  margin-top: 22px;
  padding: 38px;
  border: 1px solid var(--line);
  border-top: 5px solid var(--signal);
  background: var(--surface-strong);
}

.dependency-card h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(30px, 3vw, 44px);
  line-height: 1.15;
}

.dependency-verdict {
  margin: 18px 0 0;
  color: var(--ink-soft);
}

.dependency-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 34px;
}

.dependency-columns span {
  color: var(--signal);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.dependency-columns ul {
  margin: 14px 0 0;
  padding-left: 20px;
  color: var(--ink-soft);
}

.dependency-columns li {
  margin-bottom: 9px;
}

.dependency-columns li::marker {
  color: var(--signal);
}

.why-skill {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 22px;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.why-skill > div {
  padding: 34px 28px;
  border-right: 1px solid var(--line);
}

.why-skill > div:last-child {
  border-right: 0;
}

.why-number {
  color: var(--signal);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
}

.why-skill h3 {
  margin: 14px 0 8px;
  font-family: var(--serif);
  font-size: 28px;
}

.why-skill p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.closing-note {
  margin: 52px 0 0;
  padding: 28px 0 0 34px;
  border-top: 1px solid var(--line-strong);
  border-left: 4px solid var(--signal);
  font-family: var(--serif);
  font-size: clamp(24px, 3vw, 36px);
  line-height: 1.55;
}

footer {
  display: flex;
  width: var(--content);
  min-height: 110px;
  align-items: center;
  justify-content: space-between;
  margin: 0 auto;
  border-top: 1px solid var(--line-strong);
  color: var(--ink-soft);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

footer p {
  margin: 0;
}

.image-dialog {
  width: min(96vw, 1680px);
  max-width: none;
  max-height: 94vh;
  overflow: visible;
  padding: 0;
  border: 0;
  background: transparent;
}

.image-dialog::backdrop {
  background: rgb(20 17 14 / 0.82);
  backdrop-filter: blur(10px);
}

.image-dialog img {
  display: block;
  width: 100%;
  max-height: 90vh;
  object-fit: contain;
  border: 1px solid rgb(255 255 255 / 0.24);
  border-radius: 4px;
  box-shadow: 0 32px 90px rgb(0 0 0 / 0.38);
}

.dialog-close {
  position: absolute;
  top: -50px;
  right: 0;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid rgb(255 255 255 / 0.42);
  border-radius: 50%;
  color: #fff;
  background: rgb(20 17 14 / 0.65);
  cursor: pointer;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 50;
  padding: 12px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  color: var(--surface-strong);
  background: var(--ink);
  box-shadow: var(--shadow);
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px);
  transition: opacity 180ms ease-out, transform 180ms ease-out;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal {
  opacity: 1;
  transform: none;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 900px) {
  :root {
    --content: min(100% - 32px, 720px);
  }

  .site-header {
    padding: 0 16px;
  }

  .site-header nav {
    gap: 16px;
  }

  .hero {
    padding-top: 72px;
  }

  .hero-copy,
  .section-heading {
    grid-template-columns: 1fr;
  }

  .verdict {
    margin-top: 8px;
  }

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

  .hero-metrics div:nth-child(2) {
    border-right: 0;
  }

  .hero-metrics div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .session,
  .how,
  .skill-section {
    padding: 82px 0;
  }

  .section-heading {
    gap: 20px;
  }

  .session-bar {
    align-items: flex-start;
    flex-direction: column;
  }

  .session-meta {
    grid-template-columns: 1fr 1fr;
  }

  .session-meta div:nth-child(2) {
    border-right: 0;
  }

  .session-meta div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .flow {
    grid-template-columns: 1fr 1fr;
    gap: 32px 0;
  }

  .flow::before {
    display: none;
  }

  .browser-launch,
  .mechanism-card,
  .skill-anatomy,
  .runtime-diagram,
  .runtime-portability,
  .dependency-card {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .local-server-note {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .file-roles {
    padding: 18px 30px;
  }
}

@media (max-width: 620px) {
  :root {
    --content: calc(100% - 24px);
  }

  body {
    font-size: 16px;
  }

  .site-header {
    min-height: 62px;
  }

  .brand span {
    display: none;
  }

  .brand {
    display: grid;
    min-width: 44px;
    min-height: 44px;
    place-items: center;
  }

  .site-header nav {
    width: 100%;
    justify-content: flex-end;
    gap: 14px;
  }

  .site-header nav a {
    padding: 18px 0 15px;
    font-size: 12px;
  }

  .hero {
    padding: 56px 0 76px;
  }

  h1 {
    font-size: clamp(50px, 16vw, 72px);
  }

  .hero-lead {
    font-size: 17px;
  }

  .hero-metrics {
    margin-top: 48px;
  }

  .hero-metrics div {
    padding: 20px 14px;
  }

  .hero-metrics dt {
    font-size: 38px;
  }

  .section-heading h2 {
    font-size: 42px;
  }

  .session-frame {
    margin-right: -4px;
    margin-left: -4px;
  }

  .session-bar {
    padding: 20px 16px;
  }

  .session-actions {
    width: 100%;
  }

  .session-actions a,
  .copy-button {
    justify-content: center;
  }

  .session-meta {
    grid-template-columns: 1fr;
  }

  .session-meta div,
  .session-meta div:nth-child(2) {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .session-meta div:last-child {
    border-bottom: 0;
  }

  .transcript {
    padding: 26px 12px 38px;
  }

  .message {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .message-role {
    padding: 0 3px;
    text-align: left;
  }

  .message-body {
    padding: 16px;
  }

  .tool-call {
    margin-left: 0;
  }

  .tool-call summary {
    grid-template-columns: 36px minmax(0, 1fr);
    padding: 10px 12px;
  }

  .tool-count {
    grid-column: 2;
  }

  .tool-detail {
    padding: 4px 14px 16px;
  }

  .flow {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .flow li {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 0 18px;
    padding: 0;
    text-align: left;
  }

  .flow-number {
    grid-row: 1 / 3;
    margin: 0;
  }

  .flow h3 {
    margin-bottom: 5px;
  }

  .mechanism-card {
    padding: 30px 22px;
  }

  .browser-launch {
    padding: 30px 22px;
  }

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

  .browser-launch-flow li:not(:last-child)::after {
    top: auto;
    right: 50%;
    bottom: -10px;
    transform: translateX(50%) rotate(135deg);
  }

  .mechanism-line {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .mechanism-line i {
    width: 1px;
    height: 14px;
    margin-left: 10px;
  }

  .skill-identity,
  .dependency-columns,
  .why-skill {
    grid-template-columns: 1fr;
  }

  .skill-tree-panel {
    padding: 30px 22px;
  }

  .runtime-diagram {
    padding: 30px 22px;
  }

  .runtime-portability {
    padding: 26px 22px;
  }

  .runtime-sequence li {
    grid-template-columns: 38px 1fr;
    gap: 5px 16px;
  }

  .runtime-sequence li > code,
  .runtime-sequence li > strong,
  .runtime-sequence li > p {
    grid-column: 2;
  }

  .runtime-sequence li > code {
    align-self: end;
  }

  .runtime-sequence li > strong {
    align-self: start;
  }

  .runtime-step {
    grid-row: 1 / 4;
  }

  .skill-tree-panel pre {
    padding: 16px;
  }

  .skill-tree-panel code {
    font-size: 10px;
  }

  .file-roles {
    padding: 12px 22px;
  }

  .file-roles > div {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .identity-card,
  .dependency-card {
    padding: 28px 22px;
  }

  .why-skill > div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .why-skill > div:last-child {
    border-bottom: 0;
  }

  .closing-note {
    padding-left: 20px;
    font-size: 23px;
  }

  footer {
    min-height: 130px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
  }

  .zoom-label {
    right: 8px;
    bottom: 8px;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-contrast: more) {
  :root {
    --ink-soft: #3c332c;
    --line: #877869;
  }
}