:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --surface-warm: #fbf7ef;
  --ink: #1e242b;
  --muted: #66717f;
  --line: #d9e1ea;
  --subtle: #edf1f6;
  --teal: #0f766e;
  --teal-dark: #0b5f59;
  --teal-soft: #dff4f1;
  --blue: #2563eb;
  --blue-soft: #e8f0ff;
  --rose: #b42357;
  --rose-soft: #ffe8ef;
  --gold: #9a6700;
  --gold-soft: #fff3cd;
  --orange: #b45309;
  --orange-soft: #ffedd5;
  --cyan: #087f8c;
  --cyan-soft: #ddf7fb;
  --code-bg: #121722;
  --code-ink: #eef4ff;
  --shadow: 0 18px 42px rgba(24, 39, 57, 0.08);
  --top-offset: 146px;
  font-family: Inter, "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--top-offset);
}

body {
  margin: 0;
  min-width: 320px;
  background:
    linear-gradient(180deg, rgba(15, 118, 110, 0.08), transparent 360px),
    var(--bg);
  color: var(--ink);
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

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

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

p {
  color: var(--muted);
  line-height: 1.72;
}

code {
  font-family: "Cascadia Mono", "SFMono-Regular", Consolas, monospace;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(250px, 1fr) auto minmax(230px, 360px);
  gap: 16px;
  align-items: center;
  padding: 14px 22px;
  border-bottom: 1px solid rgba(217, 225, 234, 0.9);
  background: rgba(250, 252, 255, 0.93);
  backdrop-filter: blur(16px);
}

.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  min-width: 0;
  color: inherit;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  place-items: center;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.brand strong {
  font-size: 16px;
}

.brand small {
  margin-top: 2px;
  color: var(--muted);
  font-size: 12px;
}

.route-switch {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  width: 230px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.route-button {
  min-height: 36px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-weight: 800;
}

.route-button.is-active {
  background: var(--teal);
  color: #fff;
}

.search-box {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px;
  align-items: center;
  min-width: 0;
  height: 46px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.search-box span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.search-box input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--ink);
}

.course-bar {
  position: sticky;
  top: 75px;
  z-index: 18;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 18px;
  align-items: center;
  padding: 10px 22px;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 247, 250, 0.92);
  backdrop-filter: blur(16px);
}

.view-tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(130px, 1fr));
  gap: 8px;
  overflow-x: auto;
}

.view-tab {
  display: grid;
  gap: 3px;
  min-height: 58px;
  min-width: 130px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  text-align: left;
}

.view-tab strong {
  color: var(--ink);
  font-size: 14px;
}

.view-tab span {
  overflow: hidden;
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.view-tab.is-active {
  border-color: rgba(15, 118, 110, 0.45);
  background: var(--teal-soft);
}

.chapter-progress {
  display: grid;
  gap: 8px;
  min-width: 0;
}

.chapter-progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 12px;
  font-weight: 800;
}

.chapter-progress-meta span {
  color: var(--muted);
}

.progress-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #dbe3ed;
}

.progress-track span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--teal), var(--blue), var(--rose));
  transition: width 180ms ease;
}

.layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr) 310px;
  gap: 22px;
  align-items: start;
  width: min(1680px, 100%);
  margin: 0 auto;
  padding: 22px;
}

.sidebar,
.right-rail {
  position: sticky;
  top: var(--top-offset);
}

.sidebar,
.rail-stack,
.content {
  display: grid;
  gap: 14px;
  min-width: 0;
}

.content {
  gap: 22px;
}

.summary-panel,
.body-panel,
.hero-band,
.flow-panel,
.stage-card,
.sample-group,
.algorithm-panel,
.sample-details,
.raw-json,
.format-box,
.command-panel,
.sample-panel {
  min-width: 0;
}

.sidebar-header,
.rail-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.sidebar-header strong {
  color: var(--teal);
}

.stage-nav,
.concept-nav {
  display: grid;
  gap: 8px;
}

.stage-link {
  display: grid;
  grid-template-columns: 36px 1fr auto;
  gap: 8px;
  align-items: center;
  min-height: 46px;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  text-align: left;
}

.stage-link:hover,
.stage-link.is-active {
  border-color: rgba(15, 118, 110, 0.28);
  background: var(--surface);
  box-shadow: 0 8px 18px rgba(24, 39, 57, 0.06);
}

.stage-link span {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 6px;
  background: var(--surface-soft);
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
}

.stage-link strong {
  overflow: hidden;
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.stage-link small {
  color: var(--muted);
  font-size: 11px;
  white-space: nowrap;
}

.concept-nav button {
  min-height: 36px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  text-align: left;
  font-size: 13px;
  font-weight: 800;
}

.hero-band,
.flow-panel,
.stage-card,
.assets-band,
.rail-panel,
.sample-hero,
.sample-group,
.concept-tile,
.algorithm-panel,
.empty-state {
  width: 100%;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.hero-band {
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(280px, 0.96fr);
  gap: 20px;
  min-height: 430px;
  overflow: hidden;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 34px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  max-width: 780px;
  margin-bottom: 16px;
  font-size: clamp(32px, 4vw, 56px);
  line-height: 1.05;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 0;
  font-size: 28px;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 15px;
}

.hero-copy > p:not(.eyebrow),
.sample-hero > div > p {
  max-width: 820px;
  font-size: 16px;
}

.route-summary {
  display: grid;
  gap: 6px;
  margin-top: 18px;
  padding: 16px;
  border: 1px solid rgba(15, 118, 110, 0.22);
  border-radius: 8px;
  background: var(--teal-soft);
}

.route-summary strong {
  color: var(--teal-dark);
}

.route-summary span,
.route-summary small {
  color: #315b56;
  line-height: 1.55;
}

.hero-visual {
  width: 100%;
  min-height: 360px;
  padding: 0;
  border: 0;
  background: #111722;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.flow-panel,
.assets-band,
.stage-card,
.sample-group,
.algorithm-panel,
.empty-state {
  padding: 24px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.heading-note {
  color: var(--muted);
  font-size: 13px;
}

.pipeline {
  display: grid;
  grid-template-columns: repeat(11, minmax(86px, 1fr));
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 2px;
  max-width: 100%;
  min-width: 0;
}

.pipeline-step {
  display: grid;
  gap: 6px;
  min-width: 86px;
  min-height: 76px;
  padding: 12px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
  color: var(--ink);
  text-align: left;
}

.pipeline-step span {
  color: var(--teal);
  font-size: 12px;
  font-weight: 900;
}

.pipeline-step strong {
  font-size: 13px;
}

.pipeline-step.is-active {
  border-color: rgba(15, 118, 110, 0.5);
  background: var(--teal);
  color: #fff;
}

.pipeline-step.is-active span {
  color: #d6fff9;
}

.stage-title-row,
.panel-heading,
.path-row,
.sample-group-header {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
}

.stage-badge,
.stage-jump {
  flex: 0 0 auto;
  border: 1px solid rgba(15, 118, 110, 0.26);
  border-radius: 999px;
  background: var(--teal-soft);
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 900;
}

.stage-badge {
  padding: 8px 12px;
}

.stage-jump {
  min-height: 36px;
  padding: 0 14px;
}

.stage-summary {
  max-width: 940px;
  margin: 14px 0 22px;
  color: #393f47;
  font-size: 17px;
}

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

.stage-grid section,
.path-row > div,
.notes-panel {
  min-width: 0;
  padding: 16px;
  border-top: 1px solid var(--subtle);
  background: transparent;
}

.path-row,
.stage-footer-grid {
  margin-top: 14px;
}

.path-row > div {
  width: 50%;
}

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

.code-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.code-list code {
  max-width: 100%;
  padding: 6px 8px;
  border-radius: 6px;
  background: #e8eef5;
  color: #39403e;
  font-size: 12px;
  overflow-wrap: anywhere;
}

.command-panel,
.sample-panel,
.notes-panel,
.format-box {
  margin-top: 16px;
}

.sample-details {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.sample-details summary,
.raw-json summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 48px;
  padding: 10px 12px;
  color: var(--ink);
  font-weight: 900;
  list-style: none;
}

.sample-details summary::-webkit-details-marker,
.raw-json summary::-webkit-details-marker {
  display: none;
}

.copy-button {
  min-width: 62px;
  min-height: 34px;
  border: 1px solid rgba(15, 118, 110, 0.3);
  border-radius: 8px;
  background: #fff;
  color: var(--teal);
  font-size: 13px;
  font-weight: 900;
}

.code-block {
  margin: 0;
  max-width: 100%;
  min-width: 0;
  overflow: auto;
  padding: 18px;
  border-radius: 8px;
  background: var(--code-bg);
  color: var(--code-ink);
  line-height: 1.58;
}

.sample-details .code-block {
  border-radius: 0 0 8px 8px;
}

.code-block code {
  color: inherit;
  font-size: 13px;
  white-space: pre;
}

.tok-key {
  color: #8bd3ff;
}

.tok-string {
  color: #a7f3d0;
}

.tok-number {
  color: #facc15;
}

.tok-bool {
  color: #fda4af;
}

.tok-command {
  color: #fbbf24;
  font-weight: 800;
}

.notes-panel ul,
.check-list,
.ordered-list {
  margin: 0;
  padding-left: 18px;
}

.notes-panel li,
.check-list li,
.ordered-list li {
  margin: 8px 0;
  color: var(--muted);
  line-height: 1.6;
}

.concept-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.concept-chips span,
.meta-tag {
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
}

.stage-image-button {
  width: 100%;
  margin-top: 18px;
  padding: 0;
  border: 0;
  background: transparent;
}

.stage-image {
  width: 100%;
  max-height: 520px;
  border: 1px solid var(--line);
  border-radius: 8px;
  object-fit: contain;
  background: #111722;
}

.rail-panel {
  padding: 16px;
}

.chapter-card {
  margin-top: 12px;
  padding: 13px;
  border: 1px solid var(--subtle);
  border-radius: 8px;
  background: var(--surface-soft);
}

.chapter-card strong {
  display: block;
  color: var(--ink);
}

.chapter-card p {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.55;
}

.concept-list {
  display: grid;
  gap: 10px;
  margin-top: 12px;
  max-height: 430px;
  overflow: auto;
}

.concept-card {
  padding: 12px;
  border: 1px solid var(--subtle);
  border-radius: 8px;
  background: var(--surface-soft);
}

.concept-card strong {
  color: var(--teal-dark);
}

.concept-card p {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.55;
}

.sample-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 18px;
  align-items: end;
  padding: 28px;
}

.sample-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: end;
}

.action-button,
.ghost-button {
  min-height: 40px;
  padding: 0 16px;
  border-radius: 8px;
  font-weight: 900;
}

.action-button {
  border: 1px solid var(--teal);
  background: var(--teal);
  color: #fff;
}

.ghost-button {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.format-box {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.example-list {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.example-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.example-card.is-open {
  border-color: rgba(15, 118, 110, 0.3);
  box-shadow: 0 12px 28px rgba(24, 39, 57, 0.07);
}

.example-card-header {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  padding: 12px 16px;
  border: 0;
  background: var(--surface-warm);
  color: var(--ink);
  text-align: left;
}

.example-card-header span {
  display: grid;
  gap: 3px;
  min-width: 0;
}

.example-card-header small {
  overflow: hidden;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

.example-card-header strong {
  font-size: 15px;
}

.example-card-header em {
  flex: 0 0 auto;
  color: var(--teal);
  font-size: 13px;
  font-style: normal;
  font-weight: 900;
}

.example-card-body {
  display: grid;
  gap: 14px;
  padding: 16px;
}

.message-stack {
  display: grid;
  gap: 10px;
}

.msg {
  display: grid;
  gap: 5px;
}

.msg-role {
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.msg-role.text {
  color: var(--muted);
}

.msg-role.system {
  color: var(--gold);
}

.msg-role.user {
  color: #168047;
}

.msg-role.assistant {
  color: var(--blue);
}

.msg-role.tool {
  color: var(--cyan);
}

.msg-content,
.reasoning-block,
.tool-call-block,
.tools-def-block,
.gt-block {
  padding: 11px 13px;
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.65;
  word-break: break-word;
}

.msg.text .msg-content {
  border-left: 3px solid var(--muted);
  background: var(--surface-soft);
}

.msg.system .msg-content,
.tools-def-block {
  border-left: 3px solid var(--gold);
  background: var(--gold-soft);
}

.msg.user .msg-content {
  border-left: 3px solid #22a464;
  background: #e9f8ef;
}

.msg.assistant .msg-content {
  border-left: 3px solid var(--blue);
  background: var(--blue-soft);
}

.msg.tool .msg-content {
  border-left: 3px solid var(--cyan);
  background: var(--cyan-soft);
}

.reasoning-block {
  border-left: 3px solid var(--orange);
  background: var(--orange-soft);
}

.tool-call-block {
  border-left: 3px solid var(--cyan);
  background: var(--cyan-soft);
}

.pending-gen {
  border-left-color: var(--rose);
  background: var(--rose-soft);
  color: #7a1e3a;
  font-style: italic;
}

.reasoning-block strong,
.tool-call-block strong,
.tools-def-block strong,
.gt-block strong {
  display: block;
  margin-bottom: 6px;
  font-size: 11px;
  font-weight: 900;
}

.reasoning-block p,
.tool-call-block p,
.gt-block p {
  margin: 0;
}

.tools-def-block .code-block {
  margin-top: 8px;
  padding: 12px;
}

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

.dpo-side {
  display: grid;
  gap: 10px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.dpo-side.chosen {
  border-color: rgba(34, 164, 100, 0.45);
}

.dpo-side.rejected {
  border-color: rgba(180, 35, 87, 0.45);
}

.dpo-side h4 {
  margin-bottom: 2px;
  font-size: 14px;
}

.gt-block {
  border-left: 3px solid var(--rose);
  background: var(--rose-soft);
}

.raw-json {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-soft);
}

.raw-json .code-block {
  border-radius: 0 0 8px 8px;
}

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

.concept-tile {
  padding: 16px;
}

.concept-tile strong {
  color: var(--teal-dark);
}

.concept-tile p {
  margin: 8px 0 0;
  font-size: 14px;
}

.algorithm-table {
  overflow-x: auto;
}

.algorithm-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.algorithm-table th,
.algorithm-table td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--subtle);
  text-align: left;
  vertical-align: top;
}

.algorithm-table th {
  color: var(--teal);
  font-weight: 900;
}

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

.asset-card {
  overflow: hidden;
  border: 1px solid var(--subtle);
  border-radius: 8px;
  background: var(--surface-soft);
  cursor: zoom-in;
}

.asset-trigger {
  cursor: zoom-in;
}

.asset-card:focus-visible,
.asset-trigger:focus-visible,
.copy-button:focus-visible,
.view-tab:focus-visible,
.stage-link:focus-visible,
.pipeline-step:focus-visible,
.route-button:focus-visible,
.action-button:focus-visible,
.ghost-button:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.asset-card img {
  width: 100%;
  height: 190px;
  object-fit: cover;
  background: #101722;
}

.asset-card div {
  padding: 12px;
}

.asset-card p {
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.55;
}

.asset-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: none;
  padding: 24px;
}

.asset-modal.is-open {
  display: grid;
  place-items: center;
}

.asset-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(13, 18, 28, 0.74);
}

.asset-modal-dialog {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 14px;
  width: min(1180px, 100%);
  max-height: calc(100vh - 48px);
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  background: #10131a;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}

.asset-modal-toolbar {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
  color: #f6f8fb;
}

.asset-modal-toolbar strong {
  display: block;
  font-size: 16px;
}

.asset-modal-toolbar p {
  margin: 4px 0 0;
  color: #b6c1d1;
  font-size: 13px;
  line-height: 1.5;
}

.asset-modal-close {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 24px;
  line-height: 1;
}

.asset-modal-close:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 2px;
}

.asset-modal img {
  width: 100%;
  max-height: calc(100vh - 148px);
  object-fit: contain;
  border-radius: 8px;
  background: #0b0e14;
}

.empty-state {
  text-align: center;
}

@media (max-width: 1260px) {
  .topbar {
    grid-template-columns: minmax(240px, 1fr) auto;
  }

  .search-box {
    grid-column: 1 / -1;
  }

  .course-bar {
    top: 137px;
  }

  :root {
    --top-offset: 214px;
  }

  .layout {
    grid-template-columns: 220px minmax(0, 1fr);
  }

  .right-rail {
    position: static;
    grid-column: 1 / -1;
  }

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

@media (max-width: 960px) {
  .course-bar {
    grid-template-columns: 1fr;
  }

  .chapter-progress {
    max-width: none;
  }

  .layout {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .sidebar {
    position: static;
  }

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

  .stage-link {
    grid-template-columns: 34px 1fr;
  }

  .stage-link small {
    display: none;
  }

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

  .hero-copy {
    padding: 26px;
  }

  .hero-visual {
    min-height: 260px;
  }

  .rail-stack,
  .stage-grid,
  .path-row,
  .stage-footer-grid,
  .dpo-compare,
  .concept-board,
  .asset-grid {
    grid-template-columns: 1fr;
  }

  .path-row {
    display: grid;
  }

  .path-row > div {
    width: 100%;
  }

  .sample-actions {
    justify-content: start;
  }
}

@media (max-width: 640px) {
  :root {
    --top-offset: 0px;
  }

  .topbar,
  .course-bar {
    position: static;
    grid-template-columns: 1fr;
    padding: 14px;
  }

  .route-switch {
    width: 100%;
  }

  .view-tabs {
    grid-template-columns: repeat(4, minmax(128px, 1fr));
  }

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

  h1 {
    font-size: 34px;
  }

  h2 {
    font-size: 24px;
  }

  .stage-title-row,
  .section-heading,
  .sample-group-header,
  .panel-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .flow-panel,
  .assets-band,
  .stage-card,
  .sample-group,
  .algorithm-panel {
    padding: 18px;
  }

  .sample-hero {
    padding: 20px;
  }

  .pipeline {
    grid-template-columns: repeat(4, minmax(86px, 1fr));
  }

  .code-block {
    padding: 14px;
  }

  .code-block code {
    font-size: 12px;
  }

  .asset-modal {
    padding: 14px;
  }

  .asset-modal-dialog {
    max-height: calc(100vh - 28px);
    padding: 14px;
  }

  .asset-modal img {
    max-height: calc(100vh - 126px);
  }
}