/* KK树视觉候选 C1：自然、克制、有质感。只改变呈现，不隐藏正文。 */
:root {
  --page: #f6f7f2;
  --surface: #fff;
  --ink: #10251a;
  --muted: #5b6b61;
  --accent: #16704b;
  --accent-dark: #0b5639;
  --line: #dce3dc;
  --soft: #edf2ea;
  --radius: 20px;
}

body { background: var(--page); letter-spacing: -.006em; }
.refresh-main { background: var(--page); }
.shell { width: min(calc(100% - 64px), 1184px); }

/* A calmer, shorter header; mobile keeps every destination in a swipeable row. */
.site-header { position: relative; z-index: 20; background: rgba(246,247,242,.98); }
.header-inner { min-height: 76px; }
.brand-logo { width: 124px; }
.desktop-nav { gap: 28px; font-size: 14px; }
.desktop-nav a { position: relative; }
.desktop-nav [aria-current] { text-decoration: none; }
.desktop-nav [aria-current]::after { position: absolute; right: 0; bottom: 8px; left: 0; height: 1px; content: ""; background: var(--accent); }
.header-action { min-height: 40px; font-size: 13px; }

/* Home: one photo-led hero, then the choice path before the brand film. */
.refresh-hero { margin: 16px; overflow: hidden; border-radius: 20px; background: #e7eee1; }
.refresh-hero-copy { padding-top: 72px; padding-bottom: 72px; }
.refresh-hero h1 { max-width: 520px; font-size: clamp(46px,5vw,72px); line-height: 1.06; }
.refresh-hero-copy>p { max-width: 420px; font-size: 17px; }
.refresh-ribbon { padding-block: 18px; background: #123d2d; }
.refresh-ribbon p { font-size: 15px; }
.brand-home-intro { padding-block: 88px; }
#collections { padding-top: 80px; padding-bottom: 96px; }
#collections .refresh-heading { margin-bottom: 28px; }
.collection-grid { gap: 28px 16px; }
.collection-tile { padding: 12px 12px 18px; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); }
.collection-tile picture { display: grid !important; height: 344px !important; place-items: center; overflow: hidden !important; border-radius: 12px; background: #edf1e9; }
.collection-tile picture img { width: 100% !important; height: 100% !important; object-fit: contain !important; }
.collection-tile h3 { margin: 18px 4px 6px; font-size: 21px; font-weight: 500; }
.collection-tile p { margin: 0 4px; }
.refresh-block { padding-block: 88px; }
.refresh-heading h2,.awards-heading h2 { max-width: 720px; }
.proof-strip { gap: 24px; }
.proof-strip>div { padding-right: 20px; }
.paper-band { background: #eaf0e5; }
.paper-feature { gap: 64px; }
.paper-cover { border-radius: 12px; box-shadow: 0 16px 40px rgba(22,51,36,.12); }
.brand-film-preview { gap: 48px; }
.brand-film-frame { border-radius: 20px; }

/* Category pages: shorter introduction and a legible, image-first mobile order. */
.refresh-nav { gap: 8px; padding-block: 16px; border-bottom: 0; }
.refresh-nav a { min-height: 38px; padding: 6px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); }
.refresh-nav [aria-current] { border-color: #9eb6a7; text-decoration: none; background: #e9f0e7; }
.collection-hero { gap: 72px; padding-block: 64px 72px; }
.collection-hero h1 { margin: 12px 0 24px; font-size: clamp(44px,5vw,64px); line-height: 1.08; }
.collection-hero>picture { padding: 12px; border-radius: 20px; background: #edf1e9; }
.collection-hero>picture img { border-radius: 12px; }
.brand-category-intro { margin-block: 0 24px; }
.brand-category-intro p { max-width: 560px; }
.answer-section { max-width: 920px; }
.answer-section+ .answer-section { border-top: 1px solid var(--line); }
.answer-section h2 { max-width: 760px; text-wrap: balance; }
.decision-pair figure,.decision-results div,.collection-note { border-radius: 16px; }
.gallery-grid { gap: 40px 24px; }

/* Technology and long-form page titles: balanced, consumer-facing hierarchy. */
.outline-hero { padding: 72px 0; background: #eef2ea; }
.outline-hero-grid { grid-template-columns: minmax(0,1.55fr) minmax(300px,.45fr); gap: 64px; }
.outline-hero h1 { max-width: 860px; font-size: clamp(42px,5vw,68px); line-height: 1.08; text-wrap: balance; }
.outline-summary { padding: 24px 0 4px; border-top: 1px solid #bdcbbf; }
.outline-grid { padding-top: 64px; }
.outline-section { grid-template-columns: 56px 1fr; padding: 36px 0; }

/* Evidence: certificates remain complete; hierarchy comes from spacing, not decoration. */
.research-head { padding-block: 72px 56px; }
.research-head h1 { font-size: clamp(42px,5vw,64px); line-height: 1.08; text-wrap: balance; }
.proof-grid { gap: 24px; }
.proof-card { padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); }
.proof-card>a { display: grid; place-items: center; border-radius: 12px; background: #f0f2ed; }
.proof-card img { max-width: 100%; object-fit: contain; }
.award-certificate { border-radius: 16px; background: #f0f2ed; }
.award-entry-featured { padding: 32px; border: 1px solid var(--line); border-radius: 20px; background: var(--surface); }
.award-gallery { gap: 24px; }
.award-gallery .award-entry { padding: 16px; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }

/* Knowledge: editorial reading width, quieter cards, stable desktop contents. */
.article-layout { padding-top: 64px; }
.article-header { margin-bottom: 40px; }
.article-header h1 { max-width: 920px; font-size: clamp(42px,5.4vw,68px); line-height: 1.1; text-wrap: balance; }
.article-grid { grid-template-columns: minmax(0,780px) minmax(240px,1fr); gap: 72px; }
.article-body { font-size: 16px; line-height: 1.78; }
.article-body h2 { font-size: 30px; text-wrap: balance; }
.article-body h3 { font-size: 20px; }
.aside-card { border-radius: 16px; box-shadow: 0 8px 24px rgba(24,50,36,.04); }
.knowledge-revision .guide-answer { padding: 20px 24px; border: 0; border-left: 3px solid var(--accent); border-radius: 0 12px 12px 0; background: #edf3ea; }
.knowledge-revision .guide-table { border-radius: 12px; background: var(--surface); }

@media (max-width: 1100px) {
  .header-inner { grid-template-columns: 1fr auto; }
  .site-header .desktop-nav { justify-content: flex-start; flex-wrap: nowrap; overflow-x: auto; padding: 0 0 10px; scrollbar-width: none; }
  .desktop-nav::-webkit-scrollbar { display: none; }
  .outline-hero-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .shell { width: min(calc(100% - 32px), 1184px); }
  .header-inner { min-height: 62px; }
  .brand-logo { width: 108px; }
  .header-action { min-height: 36px; padding: 5px 0; font-size: 12px; }
  .site-header .desktop-nav { display: flex !important; grid-column: 1/-1; width: 100%; gap: 8px; margin: 0; padding: 0 0 10px; overflow-x: auto; flex-wrap: nowrap !important; justify-content: flex-start !important; font-size: 13px; }
  .site-header .desktop-nav a { min-height: 34px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); flex: 0 0 auto; }
  .site-header .desktop-nav [aria-current] { border-color: #9eb6a7; background: #e9f0e7; }
  .site-header .desktop-nav [aria-current]::after { display: none; }

  .refresh-hero { margin: 8px; border-radius: 16px; }
  .refresh-hero-copy { padding: 28px 20px 24px; }
  .refresh-hero h1 { margin: 12px 0 16px; font-size: clamp(38px,11vw,48px); }
  .refresh-hero-copy>p { font-size: 15px; }
  .refresh-hero .refresh-actions { margin-top: 20px; }
  .refresh-hero .refresh-actions .button { min-height: 44px; flex-basis: auto; }
  .refresh-hero>picture { height: auto !important; }
  .refresh-ribbon { padding-block: 14px; }
  .refresh-ribbon small { line-height: 1.5; }
  #collections { padding-block: 48px 64px; }
  #collections .refresh-heading h2 { font-size: 32px; }
  .selection-intro { font-size: 15px; }
  .collection-grid { gap: 16px 10px; }
  .collection-tile { padding: 8px 8px 14px; border-radius: 14px; }
  .collection-tile picture { height: 210px !important; border-radius: 9px; }
  .collection-tile h3 { margin: 12px 2px 4px; font-size: 17px; }
  .collection-tile p { margin: 0 2px; font-size: 12px; line-height: 1.55; }
  .brand-home-intro,.refresh-block { padding-block: 64px; }
  .brand-film-preview { gap: 28px; }

  .refresh-nav { display: flex; flex-wrap: nowrap; gap: 8px; overflow-x: auto; padding-block: 12px; scrollbar-width: none; }
  .refresh-nav::-webkit-scrollbar { display: none; }
  .refresh-nav a { flex: 0 0 auto; min-height: 36px; padding: 5px 12px; font-size: 13px; }
  .collection-hero { display: flex; flex-direction: column; gap: 16px; padding-block: 24px 48px; }
  .collection-hero>div { display: contents; }
  .collection-hero .eyebrow { order: 1; }
  .collection-hero h1 { order: 2; margin: 4px 0 8px; font-size: 40px; }
  .collection-hero>picture { order: 3; height: auto !important; padding: 8px; border-radius: 16px; }
  .collection-hero .brand-category-intro { order: 4; margin: 8px 0 0; }
  .collection-hero h2 { order: 5; margin: 8px 0 0 !important; font-size: 24px !important; }
  .collection-hero>div>p:not(.eyebrow) { order: 6; margin: 0; }
  .collection-hero .refresh-actions { order: 7; margin-top: 8px; }
  .collection-hero .button { min-height: 44px; }

  .research-head { padding-block: 48px 28px; }
  .research-head h1 { font-size: 42px; }
  .proof-card { padding: 16px; }
  .award-entry-featured { padding: 16px; }

  .outline-hero { padding: 48px 0; }
  .outline-hero h1 { font-size: 40px; }
  .outline-summary { padding-top: 20px; }
  .outline-grid { gap: 28px; padding-top: 40px; }

  .article-layout { padding-top: 40px; }
  .article-header { margin-bottom: 24px; }
  .article-header h1 { margin: 14px 0 20px; font-size: 38px; }
  .article-grid { grid-template-columns: minmax(0,1fr); gap: 20px; }
  .article-aside { order: -1; display: block; }
  .article-toc { padding: 16px; box-shadow: none; }
  .article-toc h2 { margin: 0 0 10px; font-size: 14px; color: var(--muted); }
  .article-toc ol { display: flex; gap: 8px; overflow-x: auto; padding: 0 0 4px; list-style: none; scrollbar-width: none; }
  .article-toc ol::-webkit-scrollbar { display: none; }
  .article-toc li,.article-toc li+li { flex: 0 0 auto; margin: 0; }
  .article-toc a { display: inline-flex; min-height: 40px; align-items: center; max-width: 230px; padding: 7px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); font-size: 13px; line-height: 1.35; text-decoration: none; }
  .article-body h2 { margin-top: 48px; font-size: 27px; }
  .knowledge-revision .guide-answer { padding: 18px 16px; }
}

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; } }