/* ============================================================
   必佐营养 · 页面专属样式 · v0.2
   ============================================================ */

/* =========================================================
   导航栏
   ========================================================= */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(253, 252, 250, 0.85);
  backdrop-filter: saturate(180%) blur(16px);
  -webkit-backdrop-filter: saturate(180%) blur(16px);
  border-bottom: 1px solid transparent;
  z-index: 50;
  transition: background var(--dur-base) var(--ease-std),
              border-color var(--dur-base) var(--ease-std);
}
.nav--scrolled {
  background: rgba(253, 252, 250, 0.95);
  border-bottom-color: var(--c-border-soft);
}
.nav-inner {
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-5);
}
.nav-brand { display: inline-flex; align-items: center; }
.nav-brand img { height: 32px; width: auto; }

/* v0.2 · 顶导中间放卷期指示器(桌面端,小屏隐藏) */
.nav-issue {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--c-muted-2);
  text-transform: uppercase;
  padding: 0 var(--s-3);
  border-left: 1px solid var(--c-border-soft);
  border-right: 1px solid var(--c-border-soft);
  height: 24px;
}
.nav-issue .dot {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--c-primary);
  display: inline-block;
  animation: dot-pulse 3s ease-in-out infinite;
}
@keyframes dot-pulse {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 1; }
}
@media (max-width: 1100px) { .nav-issue { display: none; } }

.nav-links {
  display: flex; gap: var(--s-6); list-style: none;
  font-size: 14px; font-weight: 500;
}
.nav-links a {
  color: var(--c-muted);
  position: relative;
  padding: 4px 0;
  transition: color var(--dur-base) var(--ease-std);
}
.nav-links a::after {
  content: '';
  position: absolute; left: 0; bottom: -2px;
  width: 0; height: 1px;
  background: var(--c-primary);
  transition: width var(--dur-base) var(--ease-out);
}
.nav-links a:hover { color: var(--c-ink); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--c-ink); }
.nav-links a.active::after { width: 100%; }

.nav-cta { display: flex; align-items: center; gap: var(--s-3); }

/* 移动端导航 */
.nav-toggle { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; }
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  content: ''; display: block; width: 18px; height: 1px; background: var(--c-ink);
  position: relative; transition: transform 0.2s ease;
}
.nav-toggle span::before { position: absolute; top: -6px; }
.nav-toggle span::after  { position: absolute; top:  6px; }

@media (max-width: 880px) {
  .nav-links, .nav-cta .btn { display: none; }
  .nav-toggle { display: flex; }
}

/* =========================================================
   v0.2 · 章节标题编辑化 — 段号 / 卷期 / 横向细线
   通用:任意 .section-head 都会渲染"段号 + eyebrow + 细线"
   ========================================================= */
.section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: end;
  gap: var(--s-5);
  margin-bottom: var(--s-6);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-border);
  position: relative;
}
.section-head__num {
  font-family: var(--font-display-en);
  font-style: italic;
  font-weight: 400;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
  display: inline-flex; align-items: center; gap: var(--s-2);
  white-space: nowrap;
}
.section-head__num::before {
  content: ''; width: 32px; height: 1px; background: var(--c-accent);
}
.section-head__eyebrow {
  font-family: var(--font-body-en);
  font-size: var(--fs-eyebrow); font-weight: 600;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--c-muted);
  display: block;
}
@media (max-width: 720px) {
  .section-head { grid-template-columns: 1fr; gap: var(--s-2); padding-bottom: 10px; }
}

/* 章节内,把段号 + 标题 + 副本的横向关系改写 */
.section-head--inline {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--s-7);
  align-items: end;
}
.section-head--inline .section-head__num {
  border-bottom: none; padding-bottom: 0;
  margin-bottom: var(--s-3);
}
.section-head--inline .section-head__eyebrow {
  border-bottom: none; padding-bottom: 0;
  margin-bottom: var(--s-3);
}
@media (max-width: 720px) {
  .section-head--inline { grid-template-columns: 1fr; gap: var(--s-4); }
}

/* =========================================================
   慢呼吸首屏 · v0.2
   ========================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--c-primary);
  color: var(--c-white);
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 0 var(--s-5);
}
.hero::before {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 50% 30%, rgba(196,145,90,0.10) 0, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(0,0,0,0.20) 0, transparent 60%);
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; max-width: 960px; }

.hero-mark {
  width: 84px; height: auto; margin: 0 auto var(--s-7);
  filter: brightness(0) invert(1);
  opacity: 0;
  animation: fadeUp 1.4s var(--ease-out) 0.2s forwards;
}

/* v0.2 · 首屏主标:更大的 optical size + 平衡换行 */
.hero-title {
  font-size: var(--fs-display);
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.012em;
  color: var(--c-white);
  margin-bottom: var(--s-5);
  opacity: 0;
  animation: fadeUp 1.4s var(--ease-out) 0.5s forwards;
}
.hero-title em {
  font-family: var(--font-display-en);
  font-style: italic;
  font-weight: 500;
  color: var(--c-accent-soft);
  /* v0.2: 微微内嵌 swash,关键词 "营养换食" 像印章 */
  padding: 0 0.04em;
}
.hero-sub {
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  color: rgba(255,255,255,0.72);
  max-width: 580px;
  margin: 0 auto var(--s-7);
  opacity: 0;
  animation: fadeUp 1.4s var(--ease-out) 0.85s forwards;
}
.hero-actions { display: flex; gap: var(--s-3); justify-content: center; opacity: 0; animation: fadeUp 1.4s var(--ease-out) 1.15s forwards; }

/* v0.2 · 首屏四角的卷期/年份角章 */
.hero-stamp {
  position: absolute; top: calc(var(--nav-h) + var(--s-4)); left: var(--s-5);
  display: inline-flex; flex-direction: column; gap: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: rgba(255,255,255,0.55);
  text-transform: uppercase;
  z-index: 2;
  opacity: 0;
  animation: fadeIn 1.6s var(--ease-out) 1.6s forwards;
}
.hero-stamp .y { font-family: var(--font-display-en); font-style: italic; font-size: 13px; color: rgba(255,255,255,0.7); letter-spacing: 0.02em; }
.hero-stamp .label { display: inline-flex; align-items: center; gap: 6px; }
.hero-stamp .label::before { content: ''; width: 16px; height: 1px; background: var(--c-accent-soft); opacity: 0.6; }
@media (max-width: 720px) { .hero-stamp { display: none; } }

/* v0.2 · 右下角坐标戳 (模仿杂志 "p.01 / 35°12'N") */
.hero-coord {
  position: absolute; bottom: var(--s-7); right: var(--s-5);
  display: inline-flex; align-items: center; gap: var(--s-3);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.45);
  text-transform: uppercase;
  z-index: 2;
  opacity: 0;
  animation: fadeIn 1.6s var(--ease-out) 1.8s forwards;
}
.hero-coord .axis {
  display: inline-block; width: 1px; height: 14px; background: rgba(255,255,255,0.3);
}
@media (max-width: 720px) { .hero-coord { display: none; } }

.hero-breath {
  position: absolute; bottom: var(--s-7); left: 50%; transform: translateX(-50%);
  font-family: var(--font-body-en); font-size: 12px;
  letter-spacing: 0.18em; color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  opacity: 0;
  animation: fadeUp 1.4s var(--ease-out) 1.4s forwards;
}
.hero-breath::after {
  content: ''; display: block;
  width: 1px; height: 48px; margin: var(--s-2) auto 0;
  background: rgba(255,255,255,0.4);
  animation: breathLine 4s var(--ease-in-out) infinite;
  transform-origin: top;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes breathLine {
  0%, 100% { transform: scaleY(0.4); opacity: 0.3; }
  50%      { transform: scaleY(1);   opacity: 0.9; }
}

/* =========================================================
   价值主张
   ========================================================= */
.manifesto {
  padding: var(--s-9) 0;
  background: var(--c-secondary);
  text-align: center;
}
.manifesto h2 {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
  line-height: 1.35;
  max-width: 880px;
  margin: var(--s-5) auto var(--s-3);
  color: var(--c-ink);
}
.manifesto h2 em { color: var(--c-primary); font-style: normal; }
.manifesto .manifesto-foot {
  color: var(--c-muted);
  font-size: 14px;
  letter-spacing: 0.04em;
  display: inline-flex; align-items: center; gap: var(--s-2);
}
.manifesto .manifesto-foot::before,
.manifesto .manifesto-foot::after {
  content: ''; width: 24px; height: 1px; background: var(--c-accent); opacity: 0.6;
}

/* =========================================================
   v0.2 · 产品系列 — 编辑化大段号 + hairline 价格行
   ========================================================= */
.products {
  background: var(--c-surface);
  padding: var(--s-9) 0;
  border-top: 1px solid var(--c-border-soft);
  position: relative;
}
/* v0.2 · 顶部加一个卷期横线,营造"翻页"感 */
.products::before {
  content: '';
  position: absolute; top: 0; left: var(--s-5); right: var(--s-5);
  height: 1px;
  background: linear-gradient(to right, transparent 0, var(--c-border) 8%, var(--c-border) 92%, transparent 100%);
}
.products .products-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-bottom: var(--s-7); gap: var(--s-5);
  flex-wrap: wrap;
}
.products .products-head h2 { max-width: 600px; }
.products .products-head p { max-width: 360px; color: var(--c-muted); }

.product-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
}
@media (max-width: 880px) { .product-grid { grid-template-columns: 1fr; } }

.product-card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  overflow: hidden;
  display: flex; flex-direction: column;
  position: relative;
  transition:
    transform var(--dur-base) var(--ease-out),
    box-shadow var(--dur-base) var(--ease-out),
    border-color var(--dur-base) var(--ease-out);
}
/* v0.2 · 卡片左上角段号(像杂志页码) */
.product-card::before {
  content: attr(data-num);
  position: absolute; top: 14px; left: 14px;
  z-index: 2;
  font-family: var(--font-display-en);
  font-style: italic;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--c-muted);
  background: rgba(253,252,250,0.92);
  padding: 2px 8px;
  border-radius: 2px;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  pointer-events: none;
}
.product-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-primary-soft);
  box-shadow: var(--shadow-card-hover);
}
.product-card .ph {
  aspect-ratio: 4 / 5;
  border-radius: 0;
  border: none;
  border-bottom: 1px solid var(--c-border-soft);
  overflow: hidden;
}
/* v0.2 · 卡片有 data-num 时,ph-frame 退到背景,避免和段号重叠 */
.product-card[data-num] .ph .ph-frame { display: none; }
/* v0.2 · 卡片悬停,占位图微微缩放 */
.product-card .ph {
  transition: transform var(--dur-slow) var(--ease-out);
}
.product-card:hover .ph {
  transform: scale(1.02);
}
.product-card .meta {
  padding: var(--s-5);
  display: flex; flex-direction: column; gap: var(--s-3);
  flex: 1;
}
.product-card .meta .name {
  font-family: var(--font-display-zh);
  font-size: 22px; font-weight: 600;
  color: var(--c-ink);
  margin: 0;
  letter-spacing: -0.005em;
  transition: color var(--dur-base) var(--ease-std);
}
.product-card:hover .meta .name { color: var(--c-primary); }
.product-card .meta .tag-line {
  font-size: 14px; color: var(--c-muted); line-height: 1.65;
  margin: 0;
  flex: 1;
}
/* v0.2 · 价格行上方加 hairline */
.product-card .meta .row {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: var(--s-3);
  border-top: 1px solid var(--c-border-soft);
  margin-top: var(--s-3);
}
.product-card .meta .row .price {
  font-family: var(--font-display-en);
  font-size: 15px; font-weight: 500;
  color: var(--c-ink);
  letter-spacing: -0.005em;
}
.product-card .meta .row .price .unit {
  font-family: var(--font-body-zh);
  font-size: 12px; color: var(--c-muted);
  margin-left: 4px; letter-spacing: 0.04em;
}

/* =========================================================
   创始人
   ========================================================= */
.founder {
  background: var(--c-secondary);
  padding: var(--s-9) 0;
}
.founder-grid {
  display: grid; grid-template-columns: 5fr 7fr; gap: var(--s-9);
  align-items: center;
}
@media (max-width: 880px) { .founder-grid { grid-template-columns: 1fr; gap: var(--s-6); } }
.founder-photo {
  aspect-ratio: 4 / 5;
  background: linear-gradient(180deg, var(--c-ink) 0%, #2A2A2A 100%);
  position: relative;
  border-radius: var(--r-md);
  overflow: hidden;
  color: rgba(255,255,255,0.5);
}
.founder-photo::after {
  content: ''; position: absolute; inset: 0;
  background:
    radial-gradient(circle at 30% 30%, rgba(196,145,90,0.18) 0, transparent 50%);
}
.founder-photo .ph-label { color: rgba(255,255,255,0.5); }
.founder-photo .ph-hint  { color: rgba(255,255,255,0.4); }
.founder-photo .ph-frame { color: rgba(255,255,255,0.4); }

.founder-text .eyebrow { margin-bottom: var(--s-3); }
.founder-text h2 {
  font-size: clamp(28px, 3.6vw, 40px);
  line-height: 1.25;
  margin-bottom: var(--s-5);
}
.founder-text blockquote {
  font-size: 20px; line-height: 1.75;
  color: var(--c-ink-soft);
  margin: var(--s-5) 0;
}
.founder-text .sig {
  display: flex; align-items: center; gap: var(--s-3);
  margin-top: var(--s-5);
  padding-top: var(--s-4);
  border-top: 1px solid var(--c-border);
}
.founder-text .sig .name { font-family: var(--font-display-zh); font-size: 16px; color: var(--c-ink); }
.founder-text .sig .role { font-size: 13px; color: var(--c-muted); }

/* =========================================================
   方法论
   ========================================================= */
.method {
  background: var(--c-surface);
  padding: var(--s-9) 0;
  border-top: 1px solid var(--c-border-soft);
}
.method-grid {
  display: grid; grid-template-columns: 4fr 8fr; gap: var(--s-9);
}
@media (max-width: 880px) { .method-grid { grid-template-columns: 1fr; gap: var(--s-5); } }
.method-toc {
  position: sticky; top: calc(var(--nav-h) + var(--s-5));
  align-self: start;
  font-size: 13px;
}
.method-toc .label {
  display: flex; align-items: center; justify-content: space-between;
  color: var(--c-muted);
  font-size: var(--fs-eyebrow);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: var(--s-3);
}
.method-toc .label .reading {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--c-muted-2);
  text-transform: uppercase;
}
.method-toc ol { list-style: none; counter-reset: method; }
.method-toc li {
  counter-increment: method;
  padding: var(--s-2) 0;
  border-bottom: 1px solid var(--c-border-soft);
  display: flex; gap: var(--s-3); align-items: baseline;
  transition: padding-left var(--dur-base) var(--ease-out);
}
.method-toc li::before {
  content: counter(method, decimal-leading-zero);
  font-family: var(--font-display-en);
  color: var(--c-muted);
  font-size: 12px;
  font-style: italic;
  min-width: 24px;
  transition: color var(--dur-base) var(--ease-std);
}
.method-toc li a { color: var(--c-ink-soft); }
.method-toc li:hover { padding-left: 4px; }
.method-toc li a:hover { color: var(--c-primary); }

.method-body { max-width: 640px; }
.method-body h2 { margin-bottom: var(--s-5); }
.method-body h3 {
  margin-top: var(--s-6); margin-bottom: var(--s-3);
  display: flex; align-items: baseline; gap: var(--s-3);
}
.method-body h3 .h-num {
  font-family: var(--font-display-en);
  font-style: italic;
  font-size: 14px;
  font-weight: 400;
  color: var(--c-muted);
}
.method-body p { margin-bottom: var(--s-3); }
.method-body .data-row {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: var(--s-3);
  margin: var(--s-5) 0;
  padding: var(--s-4) 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.method-body .data-row .cell .n {
  font-family: var(--font-display-en);
  font-size: 32px; font-weight: 500;
  font-style: italic;
  color: var(--c-primary);
  display: block; line-height: 1.1;
  letter-spacing: -0.01em;
}
.method-body .data-row .cell .l { font-size: 12px; color: var(--c-muted); letter-spacing: 0.04em; }

/* =========================================================
   食材全宽大图
   ========================================================= */
.ingredients {
  position: relative;
  height: 90vh; min-height: 640px;
  height: 90dvh; min-height: 640px;
  display: flex; align-items: flex-end;
  background: var(--c-ink);
  color: var(--c-white);
  overflow: hidden;
}
.ingredients .ig-photo {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(196,145,90,0.20) 0, transparent 50%),
    linear-gradient(180deg, #2A2418 0%, #1A1612 100%);
}
.ingredients .ig-photo::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.6) 100%);
}
.ingredients .ig-caption {
  position: relative; z-index: 1;
  max-width: var(--container-default);
  width: 100%; margin: 0 auto;
  padding: var(--s-7) var(--s-5);
}
.ingredients .ig-caption .eyebrow { color: rgba(255,255,255,0.6); margin-bottom: var(--s-3); }
.ingredients .ig-caption p { color: rgba(255,255,255,0.85); font-size: clamp(18px, 2.2vw, 24px); max-width: 720px; line-height: 1.6; }

/* =========================================================
   选购/微信 CTA
   ========================================================= */
.contact-cta {
  background: var(--c-primary);
  color: var(--c-white);
  padding: var(--s-9) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.contact-cta::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 30% 50%, rgba(196,145,90,0.10) 0, transparent 50%);
  pointer-events: none;
}
.contact-cta .eyebrow { color: rgba(255,255,255,0.6); margin-bottom: var(--s-3); }
.contact-cta h2 { color: var(--c-white); max-width: 760px; margin: 0 auto var(--s-5); font-size: clamp(28px, 4vw, 44px); }
.contact-cta p  { color: rgba(255,255,255,0.7); max-width: 540px; margin: 0 auto var(--s-6); }
.contact-cta .actions { display: inline-flex; gap: var(--s-3); flex-wrap: wrap; justify-content: center; }
.contact-cta .wx-hint {
  margin-top: var(--s-4);
  font-size: 12px; color: rgba(255,255,255,0.5);
  letter-spacing: 0.08em;
}

/* =========================================================
   v0.2 · 页脚 — 加 colophon + 出版信息
   ========================================================= */
.footer {
  background: var(--c-ink);
  color: rgba(255,255,255,0.75);
  padding: var(--s-7) 0 var(--s-5);
  font-size: 14px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: var(--s-5);
  margin-bottom: var(--s-6);
}
@media (max-width: 880px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
.footer .col h4 { color: var(--c-white); font-family: var(--font-body-en); font-size: var(--fs-eyebrow); letter-spacing: 0.18em; text-transform: uppercase; margin-bottom: var(--s-3); font-weight: 600; }
.footer .col ul { list-style: none; }
.footer .col li { padding: 6px 0; }
.footer .col a:hover { color: var(--c-white); }
.footer .col a { color: rgba(255,255,255,0.85); }
.footer .brand {
  font-family: var(--font-display-zh);
  color: var(--c-white);
  font-size: 18px;
  margin-bottom: var(--s-3);
  display: block;
  letter-spacing: 0.02em;
}
.footer .brand span { color: var(--c-accent); font-family: var(--font-display-en); font-style: italic; font-size: 14px; margin-left: 6px; }
.footer .tag { background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.7); margin-top: var(--s-2); }

/* v0.2 · colophon 横排:版次/主编/摄影 */
.footer-colophon {
  display: flex; flex-wrap: wrap;
  gap: var(--s-5) var(--s-6);
  padding: var(--s-4) 0;
  margin-bottom: var(--s-4);
  border-top: 1px solid rgba(255,255,255,0.12);
  border-bottom: 1px solid rgba(255,255,255,0.12);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.55);
  text-transform: uppercase;
}
.footer-colophon .item { display: inline-flex; align-items: center; gap: 6px; }
.footer-colophon .k { color: rgba(255,255,255,0.4); }
.footer-colophon .v { color: rgba(255,255,255,0.85); }

.footer .legal {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--s-3);
  color: rgba(255,255,255,0.55);
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

/* =========================================================
   移动端导航抽屉
   ========================================================= */
.nav-drawer {
  position: fixed; inset: 0;
  z-index: 60;
  background: var(--c-surface);
  padding: calc(var(--nav-h) + var(--s-3)) var(--s-5) var(--s-5);
  display: flex; flex-direction: column;
  opacity: 0; visibility: hidden;
  transform: translateY(-8px);
  transition: opacity 0.25s var(--ease-std), transform 0.25s var(--ease-std), visibility 0s linear 0.25s;
}
.nav-drawer.is-open {
  opacity: 1; visibility: visible; transform: translateY(0);
  transition: opacity 0.25s var(--ease-std), transform 0.25s var(--ease-std);
}
.nav-drawer-list {
  list-style: none;
  display: flex; flex-direction: column;
  border-top: 1px solid var(--c-border-soft);
  padding-top: var(--s-3);
  margin-bottom: var(--s-5);
}
.nav-drawer-list a {
  display: flex; align-items: baseline; justify-content: space-between;
  padding: var(--s-3) 0;
  font-family: var(--font-display-zh);
  font-size: 22px; font-weight: 500;
  color: var(--c-ink);
  border-bottom: 1px solid var(--c-border-soft);
}
.nav-drawer-list a::after { content: '\2192'; color: var(--c-muted); transition: transform 0.2s var(--ease-std); }
.nav-drawer-list a:hover { color: var(--c-primary); }
.nav-drawer-list a:hover::after { transform: translateX(4px); color: var(--c-primary); }
.nav-drawer-cta {
  display: flex; flex-direction: column; gap: var(--s-3);
  margin-top: auto;
}
.nav-drawer-cta .btn { justify-content: center; }

.nav-close {
  position: absolute; top: 0; right: 0;
  width: var(--nav-h); height: var(--nav-h);
  background: transparent; border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.nav-close::before, .nav-close::after {
  content: ''; position: absolute; width: 18px; height: 1px; background: var(--c-ink);
}
.nav-close::before { transform: rotate(45deg); }
.nav-close::after  { transform: rotate(-45deg); }

body.is-locked { overflow: hidden; }

/* =========================================================
   方法论 TOC active
   ========================================================= */
.method-toc li.is-active a { color: var(--c-primary); }
.method-toc li.is-active::before { color: var(--c-primary); }
.method-toc li.is-active { padding-left: 4px; }

/* =========================================================
   微信弹窗
   ========================================================= */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(26, 26, 26, 0.55);
  z-index: 70;
  display: flex; align-items: center; justify-content: center;
  padding: var(--s-4);
  opacity: 0; visibility: hidden;
  transition: opacity 0.2s var(--ease-std), visibility 0s linear 0.2s;
}
.modal-backdrop.is-open {
  opacity: 1; visibility: visible;
  transition: opacity 0.2s var(--ease-std);
}
.modal {
  background: var(--c-white);
  border-radius: var(--r-md);
  max-width: 380px; width: 100%;
  padding: var(--s-6) var(--s-5) var(--s-5);
  text-align: center;
  position: relative;
  transform: translateY(8px);
  transition: transform 0.2s var(--ease-std);
}
.modal-backdrop.is-open .modal { transform: translateY(0); }
.modal h3 { font-size: 20px; margin-bottom: var(--s-3); }
.modal p { color: var(--c-muted); font-size: 14px; line-height: 1.7; margin-bottom: var(--s-4); }
.modal-qr {
  width: 200px; height: 200px;
  margin: 0 auto var(--s-4);
  background: var(--c-secondary);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column; gap: 4px;
  color: var(--c-muted);
  font-size: 12px;
}
.modal-qr-frame {
  position: absolute; top: 8px; left: 8px;
  font-family: var(--font-body-en);
  font-size: 9px; letter-spacing: 0.12em;
  color: var(--c-muted);
  opacity: 0.7;
}
.modal-close {
  position: absolute; top: 12px; right: 12px;
  width: 32px; height: 32px;
  background: transparent; border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}
.modal-close::before, .modal-close::after {
  content: ''; position: absolute; width: 14px; height: 1px; background: var(--c-ink);
}
.modal-close::before { transform: rotate(45deg); }
.modal-close::after  { transform: rotate(-45deg); }
.modal-hint {
  font-size: 12px; color: var(--c-muted);
  letter-spacing: 0.04em;
}

/* =========================================================
   营养换食概念区 (FMD)
   ========================================================= */
.fmd {
  background: var(--c-white);
  padding: var(--s-9) 0;
  border-top: 1px solid var(--c-border-soft);
}
.fmd-head {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-7);
  align-items: end; margin-bottom: var(--s-6);
}
@media (max-width: 880px) { .fmd-head { grid-template-columns: 1fr; gap: var(--s-4); } }
.fmd-head h2 em { color: var(--c-primary); font-style: normal; }
.fmd-head p { color: var(--c-ink-soft); font-size: 17px; line-height: 1.75; max-width: 560px; }

.key-takeaways {
  background: var(--c-secondary);
  border: 1px solid var(--c-border);
  border-left: 3px solid var(--c-accent);
  border-radius: var(--r-md);
  padding: var(--s-5) var(--s-5);
  margin: 0 0 var(--s-7);
  position: relative;
}
.kt-label {
  font-family: var(--font-body-en);
  font-size: var(--fs-eyebrow); font-weight: 600;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--c-muted);
  display: flex; align-items: center; gap: var(--s-2);
  margin-bottom: var(--s-3);
}
.kt-label::before {
  content: ''; width: 16px; height: 1px; background: var(--c-accent);
}
.key-takeaways ul { list-style: none; }
.key-takeaways li {
  font-size: 15px; line-height: 1.75;
  color: var(--c-ink-soft);
  padding: var(--s-2) 0 var(--s-2) var(--s-4);
  position: relative;
  border-top: 1px solid var(--c-border-soft);
}
.key-takeaways li:first-child { border-top: none; }
.key-takeaways li::before {
  content: ''; position: absolute; left: 0; top: 18px;
  width: 6px; height: 6px; background: var(--c-primary);
}

.fmd-steps {
  list-style: none; counter-reset: fmd;
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
  margin-bottom: var(--s-7);
}
@media (max-width: 880px) { .fmd-steps { grid-template-columns: 1fr; } }
.fmd-steps li {
  padding: var(--s-5);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  background: var(--c-surface);
  position: relative;
  transition: transform var(--dur-base) var(--ease-out), box-shadow var(--dur-base) var(--ease-out);
}
.fmd-steps li:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-card);
  border-color: var(--c-primary-soft);
}
.fmd-steps .num {
  font-family: var(--font-display-en);
  font-size: 28px; font-weight: 500;
  font-style: italic;
  color: var(--c-primary);
  display: flex; align-items: baseline; gap: 6px;
  line-height: 1; margin-bottom: var(--s-3);
}
.fmd-steps .num::after {
  content: '/ 03';
  font-size: 12px;
  color: var(--c-muted-2);
  font-style: normal;
  letter-spacing: 0.04em;
}
.fmd-steps h3 {
  font-size: 20px; font-weight: 600;
  margin-bottom: var(--s-3); color: var(--c-ink);
}
.fmd-steps h3 .small {
  display: block;
  font-family: var(--font-display-en);
  font-style: italic;
  font-weight: 400;
  font-size: 13px;
  color: var(--c-muted);
  margin-top: 2px;
  letter-spacing: 0.02em;
}
.fmd-steps p {
  font-size: 14px; line-height: 1.7;
  color: var(--c-ink-soft);
}
.fmd-actions {
  display: flex; gap: var(--s-3); flex-wrap: wrap;
  border-top: 1px solid var(--c-border-soft);
  padding-top: var(--s-5);
}

/* =========================================================
   v0.2 · 信任条 — 数字 tabular-nums + 竖向 hairline
   ========================================================= */
.trust-strip {
  background: var(--c-ink);
  color: var(--c-white);
  padding: var(--s-7) 0;
  position: relative;
  border-top: 1px solid rgba(255,255,255,0.06);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.trust-strip::before,
.trust-strip::after {
  content: '';
  position: absolute; left: 0; right: 0; height: 1px;
  background: linear-gradient(to right, transparent 0, rgba(255,255,255,0.12) 12%, rgba(255,255,255,0.12) 88%, transparent 100%);
}
.trust-strip::before { top: 8px; }
.trust-strip::after  { bottom: 8px; }

.trust-grid {
  display: grid; grid-template-columns: repeat(6, 1fr);
  gap: 0;
  text-align: center;
}
@media (max-width: 880px) { .trust-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 540px) { .trust-grid { grid-template-columns: repeat(2, 1fr); } }
.trust-cell {
  padding: var(--s-4) var(--s-3);
  border-left: 1px solid rgba(255,255,255,0.08);
}
.trust-cell:first-child { border-left: none; }
@media (max-width: 540px) {
  .trust-cell:nth-child(odd) { border-left: none; }
  .trust-cell:nth-child(n+3) { border-top: 1px solid rgba(255,255,255,0.08); }
}
.trust-cell .n {
  font-family: var(--font-display-en);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 500;
  font-style: italic;
  color: var(--c-accent-soft);
  display: block; line-height: 1.1;
  margin-bottom: var(--s-2);
  letter-spacing: -0.015em;
  /* tabular-nums 由 tokens.css 全局规则应用 */
}
.trust-cell .l {
  font-size: 12px; color: rgba(255,255,255,0.7);
  letter-spacing: 0.04em;
  font-family: var(--font-body-zh);
}

/* =========================================================
   工具 · 核心要点
   ========================================================= */
.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;
}

/* =========================================================
   v0.2 · 食材段头 (深底白字版 section-head)
   ========================================================= */
.ig-head {
  position: absolute; top: calc(var(--nav-h) + var(--s-4));
  left: var(--s-5); right: var(--s-5);
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: var(--s-5);
  font-family: var(--font-body-en);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.55);
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.2);
}
.ig-head .ig-num {
  font-family: var(--font-display-en);
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.04em;
  display: inline-flex; align-items: center; gap: var(--s-2);
  color: rgba(255,255,255,0.7);
}
.ig-head .ig-num::before {
  content: ''; width: 24px; height: 1px; background: var(--c-accent-soft);
  opacity: 0.6;
}
.ig-head .ig-eyebrow { text-align: right; color: rgba(255,255,255,0.55); }
@media (max-width: 720px) {
  .ig-head { grid-template-columns: 1fr; }
  .ig-head .ig-eyebrow { text-align: left; }
}

/* =========================================================
   v0.2c · page-hero 顶部小字 — § 段号 + 卷期指示器
   用于所有子页(about / method / founder / products / journal)
   ========================================================= */
.page-hero-meta {
  display: flex; align-items: center; justify-content: center; gap: var(--s-3);
  margin-bottom: var(--s-5);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted-2);
}
.page-hero-meta .num {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display-en);
  font-style: italic;
  text-transform: none;
  letter-spacing: 0.04em;
  font-size: 12px;
  color: var(--c-muted);
}
.page-hero-meta .num::before {
  content: ''; width: 20px; height: 1px; background: var(--c-accent);
}
.page-hero-meta .issue { display: inline-flex; align-items: center; gap: 6px; }
.page-hero-meta .issue .dot {
  width: 4px; height: 4px; border-radius: 50%;
  background: var(--c-primary);
  display: inline-block;
  animation: dot-pulse 3s ease-in-out infinite;
}
.page-hero-meta .axis { width: 1px; height: 10px; background: var(--c-border-strong); display: inline-block; }
@media (max-width: 540px) {
  .page-hero-meta { flex-wrap: wrap; gap: var(--s-2); }
}

/* =========================================================
   v0.3 · 杂志级高阶组件
   ========================================================= */

/* --- pull-quote · 大引文(Aesop / Monocle 灵魂) --- */
.pull-quote {
  background: var(--c-white);
  padding: var(--s-9) 0;
  border-top: 1px solid var(--c-border-soft);
  border-bottom: 1px solid var(--c-border-soft);
  text-align: center;
  position: relative;
}
.pull-quote__inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 var(--s-5);
  position: relative;
}
.pull-quote__mark {
  font-family: var(--font-display-en);
  font-size: clamp(80px, 14vw, 200px);
  font-weight: 400;
  line-height: 0.6;
  color: var(--c-accent-soft);
  opacity: 0.7;
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  pointer-events: none;
  user-select: none;
}
.pull-quote__text {
  font-family: var(--font-display-zh);
  font-size: clamp(22px, 3.2vw, 36px);
  line-height: 1.45;
  font-weight: 500;
  color: var(--c-ink);
  letter-spacing: -0.005em;
  margin: 0 0 var(--s-5);
  text-wrap: balance;
  position: relative;
  z-index: 1;
}
.pull-quote__text em {
  font-family: var(--font-display-en);
  font-style: italic;
  font-weight: 500;
  color: var(--c-primary);
}
.pull-quote__cite {
  display: inline-flex;
  align-items: center;
  gap: var(--s-3);
  font-family: var(--font-body-en);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}
.pull-quote__cite::before,
.pull-quote__cite::after {
  content: ''; width: 24px; height: 1px;
  background: var(--c-accent);
  opacity: 0.6;
}
.pull-quote__cite strong {
  font-weight: 600;
  color: var(--c-ink);
}

/* --- § 段号右上加 "P.0X" 页码 (running head) --- */
.section-head__page {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted-2);
  white-space: nowrap;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--c-border);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.section-head__page .dot {
  width: 4px; height: 4px;
  background: var(--c-primary);
  border-radius: 50%;
  display: inline-block;
  opacity: 0.5;
}
@media (max-width: 720px) {
  .section-head__page { display: none; }
}

@media (max-width: 720px) {
}

/* --- FMD 步骤卡之间的细线连接 --- */
.fmd-steps {
  position: relative;
}
.fmd-steps li {
  position: relative;
}
/* 在每张卡右侧画一根细虚线指向下一张 */
.fmd-steps li:not(:last-child)::after {
  content: '';
  position: absolute;
  top: 50%;
  right: calc(-1 * var(--s-5) + 8px);
  width: calc(var(--s-5) - 16px);
  height: 1px;
  background-image: linear-gradient(to right, var(--c-border-strong) 50%, transparent 50%);
  background-size: 6px 1px;
  background-repeat: repeat-x;
  pointer-events: none;
  z-index: 0;
}
.fmd-steps li .num,
.fmd-steps li h3,
.fmd-steps li p { position: relative; z-index: 1; }
@media (max-width: 880px) {
  .fmd-steps li:not(:last-child)::after {
    top: auto; right: 50%; bottom: calc(-1 * var(--s-5) + 8px);
    width: 1px; height: calc(var(--s-5) - 16px);
    background-image: linear-gradient(to bottom, var(--c-border-strong) 50%, transparent 50%);
    background-size: 1px 6px;
    transform: translateX(0.5px);
  }
}

/* --- 方法论 data-row 改用"杂志小图表" --- */
.method-body .data-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--s-3);
  margin: var(--s-5) 0;
  padding: var(--s-4) 0;
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  position: relative;
}
.method-body .data-row::before {
  content: ''; position: absolute;
  left: 0; right: 0; top: 50%;
  height: 1px; background: var(--c-border-soft);
  z-index: 0;
}
.method-body .data-row .cell {
  position: relative;
  z-index: 1;
  background: var(--c-surface);
  padding: 0 var(--s-3);
}
.method-body .data-row .cell .n {
  font-family: var(--font-display-en);
  font-size: 32px; font-weight: 500;
  font-style: italic;
  color: var(--c-primary);
  display: block; line-height: 1.1;
  letter-spacing: -0.01em;
  position: relative;
  padding-bottom: 2px;
}
/* 在数字下加细线 */
.method-body .data-row .cell .n::after {
  content: ''; display: block;
  width: 100%; max-width: 80px; height: 1px;
  background: var(--c-accent);
  opacity: 0.5;
  margin-top: 6px;
}
.method-body .data-row .cell .l {
  font-size: 12px; color: var(--c-muted);
  letter-spacing: 0.04em;
  margin-top: 6px;
  display: block;
}

/* --- 产品卡 bento 网格:第一张跨 2 行 --- */
.product-grid--bento {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: var(--s-5);
}
.product-grid--bento .product-card:first-child {
  grid-row: span 2;
}
.product-grid--bento .product-card:first-child .ph {
  aspect-ratio: 4 / 5;
}
.product-grid--bento .product-card:first-child .meta {
  padding: var(--s-5) var(--s-5) var(--s-6);
}
@media (max-width: 880px) {
  .product-grid--bento { grid-template-columns: 1fr; }
  .product-grid--bento .product-card:first-child { grid-row: auto; }
}

/* v0.3 · 食材段头页码(深底白字版) */
.ig-head .ig-page {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
  text-align: right;
  padding-bottom: 8px;
}

/* 备案号链接 */
.icp-link {
  color: var(--c-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease-std);
}
.icp-link:hover {
  color: var(--c-primary);
  text-decoration: underline;
}

/* FAQ prev/next 导航 */
.faq-prev-next {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-3);
  margin: var(--s-7) 0 var(--s-5); padding: 0;
  max-width: 760px; margin-left: auto; margin-right: auto;
}
@media (max-width: 540px) { .faq-prev-next { grid-template-columns: 1fr; } }
.faq-prev-next a {
  display: flex; flex-direction: column; gap: 4px;
  padding: var(--s-4) var(--s-5);
  background: var(--c-secondary);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  text-decoration: none; color: var(--c-ink);
  transition: border-color .2s, background .2s, transform .2s;
}
.faq-prev-next a:hover { border-color: var(--c-primary-soft); background: var(--c-primary-soft); transform: translateY(-1px); }
.faq-prev-next a.next { text-align: right; align-items: flex-end; }
.faq-prev-next .dir { font-family: var(--font-body-en); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--c-muted); font-weight: 600; }
.faq-prev-next a:hover .dir { color: var(--c-primary); }
.faq-prev-next .title { font-size: 15px; font-weight: 600; line-height: 1.4; color: var(--c-ink); }

/* FAQ 内容 tag 区 */
.faq-tags {
  display: flex; flex-wrap: wrap; gap: var(--s-2);
  margin: var(--s-5) 0; padding: 0;
  max-width: 760px; margin-left: auto; margin-right: auto;
}
.faq-tags .tag {
  font-size: 12px; letter-spacing: 0.04em; padding: 5px 12px;
  background: var(--c-secondary); color: var(--c-ink-soft);
  border-radius: 100px; text-decoration: none;
  border: 1px solid var(--c-border);
  transition: background .2s, color .2s, border-color .2s;
}
.faq-tags .tag:hover { background: var(--c-primary-soft); color: var(--c-primary); border-color: var(--c-primary-soft); }
.faq-tags-label { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--c-muted); font-weight: 600; width: 100%; margin-bottom: var(--s-2); }

/* 文章末尾 tag 区 */
.article-tags {
  display: flex; flex-wrap: wrap; gap: var(--s-2); align-items: center;
  margin: var(--s-6) 0 0; padding: var(--s-4) 0; border-top: 1px solid var(--c-border);
  max-width: 760px; margin-left: auto; margin-right: auto;
}
.article-tags .label {
  font-family: var(--font-body-en); font-size: 11px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--c-muted); font-weight: 600;
  margin-right: var(--s-2);
}
.article-tags .tag {
  font-size: 12px; padding: 5px 12px; background: var(--c-secondary);
  color: var(--c-ink-soft); border: 1px solid var(--c-border); border-radius: 100px;
  text-decoration: none; transition: background .2s, color .2s, border-color .2s;
}
.article-tags .tag:hover { background: var(--c-primary-soft); color: var(--c-primary); border-color: var(--c-primary-soft); }

/* 外部链接(Nature / 维基 / 学术等) */
.ext-link {
  color: var(--c-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--c-primary-soft);
  transition: border-color .15s var(--ease-std), background .15s;
  padding: 0 1px;
}
.ext-link:hover { border-bottom-color: var(--c-primary); background: var(--c-primary-soft); }
a.ext-link::after { content: ' ↗'; font-size: 0.85em; opacity: 0.5; margin-left: 1px; }