/* Minimal editorial layout: fewer boxes, better reading rhythm, clear actions. */
:root {
  --paper: #faf9f5;
  --surface: #ffffff;
  --ink: #151515;
  --text: #34363a;
  --muted: #73777f;
  --line: #deddd7;
  --soft-line: #eceae3;
  --accent: #f0b90b;
  --accent-soft: #fff7d7;
  --link: #0f6b57;
  --shadow: 0 20px 42px rgba(20, 20, 20, 0.08);
  --content: 1120px;
  --radius: 6px;
  --serif: Georgia, "Times New Roman", "Songti SC", "Noto Serif CJK SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Inter", Arial, sans-serif;
  --mono: "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

[id] {
  scroll-margin-top: 6rem;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.78;
  overflow-x: hidden;
}

body.modal-open {
  overflow: hidden;
}

a {
  color: inherit;
}

button,
select,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

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

h1,
h2,
h3,
p,
li,
a,
span,
button,
code {
  overflow-wrap: anywhere;
}

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

h1,
h2,
h3 {
  color: var(--ink);
  font-weight: 650;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 1rem;
  font-size: clamp(2.35rem, 5vw, 4rem);
  line-height: 1.08;
}

h2 {
  margin-bottom: 0.9rem;
  font-size: clamp(1.55rem, 2.7vw, 2.15rem);
  line-height: 1.22;
}

h3 {
  margin-bottom: 0.45rem;
  font-size: 1.08rem;
  line-height: 1.35;
}

p {
  margin-bottom: 1rem;
}

.skip-button {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 30;
  min-height: 2.6rem;
  padding: 0 0.9rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
}

.skip-button:focus {
  top: 1rem;
}

/* Quiet masthead. */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 0.75rem max(1rem, calc((100vw - var(--content)) / 2));
  border-bottom: 1px solid var(--soft-line);
  background: rgba(250, 249, 245, 0.94);
  backdrop-filter: blur(14px);
  transition: box-shadow 160ms ease, background 160ms ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 8px 24px rgba(18, 18, 18, 0.06);
}

.brand {
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  display: none;
}

.brand-text {
  font-family: var(--serif);
  font-size: clamp(2rem, 3.5vw, 3rem);
  line-height: 1;
  font-weight: 500;
}

.site-nav {
  display: flex;
  justify-content: flex-end;
  gap: 0.15rem;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
}

.site-nav::-webkit-scrollbar {
  display: none;
}

.site-nav button,
.route-panel button {
  min-height: 2.3rem;
  padding: 0.35rem 0.55rem;
  border: 0;
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 650;
  text-align: left;
  white-space: nowrap;
  transition: background 140ms ease, color 140ms ease;
}

.site-nav button:hover,
.site-nav button.is-active,
.route-panel button:hover,
.route-panel button.is-active {
  background: var(--surface);
  color: var(--ink);
}

.header-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}

.header-cta,
.button,
.media-play {
  display: inline-flex;
  max-width: 100%;
  min-height: 2.85rem;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-weight: 750;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  transition: transform 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.header-cta,
.button-primary {
  background: var(--ink);
  color: var(--surface);
}

.button-secondary {
  background: var(--accent-soft);
}

.button-ghost,
.media-play {
  background: transparent;
}

.header-cta:hover,
.button:hover,
.media-play:hover,
.header-cta:focus-visible,
.button:focus-visible,
.media-play:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 10px 20px rgba(20, 20, 20, 0.1);
  outline: none;
}

.section-block,
.site-footer {
  width: min(var(--content), calc(100% - 2rem));
  margin-left: auto;
  margin-right: auto;
}

.section-block {
  padding-top: 3.5rem;
  padding-bottom: 3.5rem;
}

.breadcrumb {
  display: flex;
  gap: 0.45rem;
  align-items: center;
  padding-top: 1rem;
  padding-bottom: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.eyebrow,
.story-kicker,
.card-index,
.meta-line {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow {
  margin-bottom: 0.65rem;
}

.story-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  align-items: center;
  margin-bottom: 1rem;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 1.55rem;
}

.section-heading p,
.hero-lead,
.site-footer p,
.page-hero p,
.content-panel p,
.content-panel li,
.feature-card p,
.download-card p,
.path-grid p,
.service-grid p {
  color: var(--text);
}

/* Human-first hero: copy and image, no crowded right rail. */
.hero-section {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.85fr);
  gap: clamp(1.5rem, 5vw, 4rem);
  align-items: center;
  padding-top: 3rem;
}

.hero-copy {
  max-width: 680px;
}

.hero-lead {
  max-width: 640px;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.45rem 0 0.9rem;
}

.meta-line {
  text-transform: none;
}

.lead-image {
  margin: 0;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.lead-image img {
  width: 100%;
  height: clamp(360px, 46vw, 560px);
  object-fit: cover;
  object-position: center top;
}

.lead-image figcaption {
  padding: 0.8rem 0.95rem;
  color: var(--muted);
  font-size: 0.92rem;
}

/* Simple cards and article content. */
.feature-grid,
.download-grid,
.info-grid,
.path-grid,
.service-grid {
  display: grid;
  gap: 1rem;
}

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

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

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

.feature-card,
.download-card,
.info-grid div,
.path-grid article {
  padding: 1.05rem 0;
  border-top: 1px solid var(--line);
}

.feature-card:hover,
.download-card:hover,
.path-grid article:hover {
  border-color: var(--ink);
}

.card-index {
  display: block;
  margin-bottom: 0.75rem;
}

.article-section {
  display: grid;
  grid-template-columns: minmax(210px, 0.25fr) minmax(0, 1fr);
  gap: clamp(1.25rem, 4vw, 3rem);
  align-items: start;
  border-top: 1px solid var(--line);
}

.route-panel {
  position: sticky;
  top: 5.8rem;
  display: grid;
  gap: 0.35rem;
  padding: 1rem 0;
}

.route-heading {
  display: grid;
  gap: 0.12rem;
  padding-bottom: 0.7rem;
  margin-bottom: 0.25rem;
  border-bottom: 1px solid var(--line);
}

.route-heading span {
  color: var(--muted);
  font-size: 0.85rem;
}

.route-heading strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 500;
}

.article-body {
  max-width: 820px;
  min-width: 0;
}

.content-panel {
  padding: 2.3rem 0;
  border-bottom: 1px solid var(--line);
}

.content-panel:first-child {
  padding-top: 0.9rem;
}

.content-panel a {
  color: var(--link);
  font-weight: 800;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

.note-box,
.inline-cta,
.mini-guide {
  margin-top: 1.2rem;
  padding: 1rem;
  border-left: 4px solid var(--ink);
  border-radius: var(--radius);
  background: var(--accent-soft);
}

.summary-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 1.2rem;
}

.summary-points div {
  padding-top: 0.9rem;
  border-top: 1px solid var(--line);
}

.summary-points strong,
.summary-points span {
  display: block;
}

.summary-points strong {
  color: var(--ink);
}

.summary-points span {
  margin-top: 0.25rem;
  color: var(--text);
}

.note-box strong,
.note-box span,
.inline-cta strong,
.inline-cta span {
  display: block;
}

.check-list,
.step-list,
.mini-guide ol {
  display: grid;
  gap: 0.75rem;
}

.check-list {
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 1.45rem;
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.58rem;
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 50%;
  background: var(--ink);
}

.step-list {
  padding-left: 0;
  list-style: none;
  counter-reset: guide-step;
}

.step-list li {
  position: relative;
  padding: 1rem 0 1rem 3rem;
  border-top: 1px solid var(--soft-line);
  counter-increment: guide-step;
}

.step-list li::before {
  content: counter(guide-step);
  position: absolute;
  left: 0;
  top: 1rem;
  display: inline-grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--ink);
  font-family: var(--mono);
  font-weight: 700;
}

.inline-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-list {
  display: grid;
  gap: 0.75rem;
}

.faq-item {
  border-top: 1px solid var(--line);
  padding: 1rem 0;
}

.faq-item summary {
  cursor: pointer;
  color: var(--ink);
  font-weight: 750;
}

.faq-item p {
  margin-top: 0.75rem;
  margin-bottom: 0;
}

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

.final-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-bottom: 3rem;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.page-hero {
  max-width: 900px;
}

/* Footer and modal components. */
.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.site-footer strong {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 500;
}

.site-footer p {
  margin-bottom: 0;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  font-size: 0.92rem;
  font-weight: 700;
}

.modal[hidden] {
  display: none;
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(250, 249, 245, 0.78);
  backdrop-filter: blur(10px);
}

.modal-card {
  position: relative;
  z-index: 1;
  width: min(560px, 100%);
  max-height: min(760px, calc(100vh - 2rem));
  overflow: auto;
  padding: 1.4rem;
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  animation: modal-in 160ms ease both;
}

.modal-card-wide {
  width: min(780px, 100%);
}

.modal-card-wide img {
  width: 100%;
  max-height: 640px;
  object-fit: contain;
  border-radius: var(--radius);
}

.modal-close {
  float: right;
  min-height: 2.3rem;
  padding: 0 0.75rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-weight: 700;
}

.copy-code {
  display: block;
  margin: 1rem 0;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  color: var(--link);
  font-family: var(--mono);
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.copy-status {
  min-height: 1.5rem;
  color: var(--link);
  font-weight: 750;
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@media (max-width: 960px) {
  .site-header {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .site-nav {
    justify-content: flex-start;
    width: 100%;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }

  .hero-section,
  .article-section,
  .feature-grid,
  .download-grid,
  .service-grid,
  .info-grid,
  .path-grid,
  .summary-points {
    grid-template-columns: 1fr;
  }

  .route-panel {
    position: static;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .article-body {
    max-width: none;
  }

}

@media (max-width: 640px) {
  body {
    font-size: 15.5px;
  }

  .section-block,
  .site-footer {
    width: min(100% - 1rem, var(--content));
  }

  .section-block {
    padding-top: 2.5rem;
    padding-bottom: 2.5rem;
  }

  .brand-text {
    font-size: 2.35rem;
  }

  .lead-image img {
    height: 360px;
  }

  .hero-actions,
  .inline-cta,
  .final-cta,
  .site-footer,
  .modal-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button,
  .header-cta,
  .media-play {
    width: 100%;
  }

  .header-actions {
    display: grid;
  }

  .step-list li {
    padding-left: 0;
    padding-top: 3.5rem;
  }
}