/* IBM Plex Sans */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&display=swap');

/* ── 基础变量 ── */
:root {
  --c-black: #000000;
  --c-white: #ffffff;
  --c-gray-100: #f5f5f5;
  --c-gray-200: #e8e8e8;
  --c-gray-400: #999999;
  --c-gray-600: #555555;
  --c-gray-800: #222222;
  --c-accent: #000000;
  --c-accent-inv: #ffffff;

  --unit: 8px;
  --gap: 1rem;
  --col12: repeat(12, 1fr);

  --nav-w: 240px;
  --content-max: 760px;
  --radius-card: 28px;

  --ff-body: 'IBM Plex Sans', 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --fw-light: 300;
  --fw-reg: 400;
  --fw-med: 500;
  --fw-semi: 600;
  --fw-bold: 700;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--ff-body);
  font-weight: var(--fw-reg);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--c-black);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { list-style: none; }
img { display: block; max-width: 100%; height: auto; }
button, input { font: inherit; }
.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;
}

/* ── 布局骨架 ── */
.site-wrapper {
  display: grid;
  grid-template-columns: var(--nav-w) 1fr;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
}

/* ── 侧边导航（aside > nav > ul > li > a） ── */
.site-nav-aside {
  grid-column: 1;
  grid-row: 1 / 4;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--c-black);
  color: var(--c-white);
  display: flex;
  flex-direction: column;
  padding: calc(var(--unit) * 3) 0;
  z-index: 100;
}

.site-nav-aside nav {
  flex: 1;
}

.site-nav-aside nav ul {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.site-nav-aside nav ul li a {
  display: block;
  padding: calc(var(--unit) * 1.5) calc(var(--unit) * 3);
  font-size: 0.813rem;
  font-weight: var(--fw-med);
  line-height: 1.4;
  color: var(--c-gray-400);
  letter-spacing: 0.01em;
  transition: color 0.15s, background 0.15s;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.site-nav-aside nav ul li a:hover,
.site-nav-aside nav ul li a[aria-current="page"] {
  color: var(--c-white);
  background: rgba(255,255,255,0.08);
  text-decoration: none;
}

.nav-brand a {
  font-size: 0.75rem !important;
  font-weight: var(--fw-bold) !important;
  color: var(--c-white) !important;
  letter-spacing: 0.08em !important;
  text-transform: uppercase;
  padding-bottom: calc(var(--unit) * 2) !important;
  border-bottom: 1px solid rgba(255,255,255,0.12);
  margin-bottom: calc(var(--unit) * 1);
}

.nav-search {
  display: flex;
  align-items: center;
  margin: calc(var(--unit) * 2) calc(var(--unit) * 2) 0;
  border: 1px solid rgba(255,255,255,0.18);
}

.nav-search input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--c-white);
  padding: calc(var(--unit) * 1) calc(var(--unit) * 1.5);
  font-size: 0.75rem;
  min-height: 40px;
}
.nav-search input::placeholder { color: var(--c-gray-400); }

.nav-search button {
  background: none;
  border: none;
  border-left: 1px solid rgba(255,255,255,0.18);
  color: var(--c-white);
  padding: 0 calc(var(--unit) * 1.5);
  cursor: pointer;
  font-size: 1rem;
  min-height: 40px;
  min-width: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}
.nav-search button:hover { background: rgba(255,255,255,0.1); }

/* ── 主内容区 ── */
.home-main,
.inner-main {
  grid-column: 2;
  grid-row: 1 / 3;
  min-width: 0;
}

/* ── 页脚 ── */
.site-footer {
  grid-column: 2;
  grid-row: 3;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: calc(var(--unit) * 4);
  padding: calc(var(--unit) * 6) calc(var(--unit) * 6);
  border-top: 2px solid var(--c-black);
  background: var(--c-gray-100);
}

.site-footer section { min-width: 0; }

.footer-brand strong {
  display: block;
  font-size: 0.875rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.05em;
  margin-bottom: calc(var(--unit) * 1);
}

.footer-brand p {
  font-size: 0.75rem;
  color: var(--c-gray-600);
  line-height: 1.5;
}

.footer-col-title {
  font-size: 0.688rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gray-400);
  margin-bottom: calc(var(--unit) * 2);
}

.footer-links ul,
.footer-legal ul {
  display: flex;
  flex-direction: column;
  gap: calc(var(--unit) * 0.75);
}

.footer-links ul li a,
.footer-legal ul li a {
  font-size: 0.813rem;
  color: var(--c-gray-600);
  transition: color 0.15s;
}
.footer-links ul li a:hover,
.footer-legal ul li a:hover { color: var(--c-black); text-decoration: none; }

.footer-copy {
  font-size: 0.688rem;
  color: var(--c-gray-400);
  margin-top: calc(var(--unit) * 3);
}

/* ── HR 装饰 ── */
hr {
  border: none;
  border-top: 1px solid var(--c-gray-200);
  margin: calc(var(--unit) * 2) 0 calc(var(--unit) * 3);
}

section > h2 + hr,
section > h3 + hr {
  border-top-width: 2px;
  border-color: var(--c-black);
  margin-bottom: calc(var(--unit) * 3);
}

/* ── 首页 Hero ── */
.hero-section {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: calc(var(--unit) * 4);
  align-items: start;
  padding: calc(var(--unit) * 8) calc(var(--unit) * 6) calc(var(--unit) * 6);
  min-height: 45vh;
  background: var(--c-black);
  color: var(--c-white);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle, rgba(255,255,255,0.06) 1px, transparent 1px);
  background-size: 24px 24px;
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: calc(var(--unit) * 6);
  align-items: center;
}

.hero-eyebrow {
  font-size: 0.688rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: calc(var(--unit) * 2);
}

.hero-h1 {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: var(--fw-bold);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: calc(var(--unit) * 2);
  max-width: 18ch;
}

.hero-lead {
  font-size: 0.938rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.6;
  max-width: 42ch;
  margin-bottom: calc(var(--unit) * 4);
}

.hero-actions {
  display: flex;
  gap: calc(var(--unit) * 2);
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  background: var(--c-white);
  color: var(--c-black);
  padding: calc(var(--unit) * 1.5) calc(var(--unit) * 3);
  font-size: 0.813rem;
  font-weight: var(--fw-semi);
  letter-spacing: 0.02em;
  min-height: 44px;
  transition: opacity 0.15s;
  border-radius: 0;
}
.btn-primary:hover { opacity: 0.85; text-decoration: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--c-white);
  border: 1px solid rgba(255,255,255,0.35);
  padding: calc(var(--unit) * 1.5) calc(var(--unit) * 3);
  font-size: 0.813rem;
  font-weight: var(--fw-med);
  min-height: 44px;
  transition: border-color 0.15s, color 0.15s;
}
.btn-secondary:hover { border-color: var(--c-white); text-decoration: none; }

/* Hero figure / icon grid */
.hero-figure {
  margin: 0;
  flex-shrink: 0;
}

.hero-icon-grid {
  display: grid;
  grid-template-columns: repeat(3, 40px);
  grid-template-rows: repeat(3, 40px);
  gap: 8px;
  position: relative;
}

.hig-dot {
  width: 40px; height: 40px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 4px;
}

.hig-accent { background: rgba(255,255,255,0.12); }

.hig-badge {
  position: absolute;
  bottom: -16px;
  right: -16px;
  background: var(--c-white);
  color: var(--c-black);
  font-size: 0.813rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.08em;
  padding: 6px 12px;
}

/* Hero aside */
.hero-aside {
  align-self: center;
  text-align: center;
  padding: calc(var(--unit) * 3);
  border-left: 1px solid rgba(255,255,255,0.15);
}

.aside-label {
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  margin-bottom: calc(var(--unit) * 1);
}

.aside-count {
  display: block;
  font-size: 2.5rem;
  font-weight: var(--fw-bold);
  line-height: 1;
  letter-spacing: -0.03em;
}

.aside-sub {
  font-size: 0.688rem;
  color: rgba(255,255,255,0.45);
  margin-top: calc(var(--unit) * 0.5);
}

/* ── 通用 section ── */
.content-section,
.cards-section,
.rank-section,
.review-section,
.children-section,
.nav-bottom-section,
.related-review-section,
.compare-more-section,
.faq-more-section,
.about-mission-section,
.privacy-note-section,
.page-header-section {
  padding: calc(var(--unit) * 5) calc(var(--unit) * 6);
}

.content-section {
  display: grid;
  grid-template-columns: 1fr 200px;
  grid-template-rows: auto auto 1fr;
  gap: calc(var(--unit) * 3) calc(var(--unit) * 4);
}

.content-section h2 {
  grid-column: 1 / -1;
}

.content-section > hr {
  grid-column: 1 / -1;
  margin-top: 0;
}

.content-figure {
  grid-column: 1;
  grid-row: 3;
  min-width: 0;
}

.content-aside {
  grid-column: 2;
  grid-row: 3;
  align-self: start;
  position: sticky;
  top: calc(var(--unit) * 3);
  padding: calc(var(--unit) * 3);
  background: var(--c-gray-100);
  border-top: 2px solid var(--c-black);
}

.content-aside .aside-label {
  font-size: 0.625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-gray-400);
  margin-bottom: calc(var(--unit) * 2);
}

.content-aside ul {
  display: flex;
  flex-direction: column;
  gap: calc(var(--unit) * 1);
}

.content-aside ul li a {
  font-size: 0.813rem;
  color: var(--c-gray-600);
  display: block;
  padding: calc(var(--unit) * 0.5) 0;
  border-bottom: 1px solid var(--c-gray-200);
  transition: color 0.15s;
}
.content-aside ul li a:hover { color: var(--c-black); text-decoration: none; }

.content-aside hr { margin: calc(var(--unit) * 2) 0; }

.aside-cta {
  display: block;
  margin-top: calc(var(--unit) * 2);
  font-size: 0.75rem;
  font-weight: var(--fw-semi);
  background: var(--c-black);
  color: var(--c-white);
  padding: calc(var(--unit) * 1.5) calc(var(--unit) * 2);
  text-align: center;
  transition: opacity 0.15s;
  min-height: 40px;
  line-height: 1.4;
}
.aside-cta:hover { opacity: 0.75; text-decoration: none; }

/* ── 正文容器 ── */
.page-content-wrap {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-gray-800);
  max-width: var(--content-max);
}

.page-content-wrap h2,
.page-content-wrap h3 { margin-top: 2em; margin-bottom: 0.5em; font-weight: var(--fw-semi); }
.page-content-wrap p { margin-bottom: 1em; }
.page-content-wrap ul, .page-content-wrap ol { margin: 1em 0 1em 1.5em; list-style: disc; }
.page-content-wrap ol { list-style: decimal; }
.page-content-wrap li { margin-bottom: 0.4em; }
.page-content-wrap strong { font-weight: var(--fw-semi); }
.page-content-wrap table { border-collapse: collapse; width: 100%; margin: 1.5em 0; font-size: 0.875rem; }
.page-content-wrap th, .page-content-wrap td { border: 1px solid var(--c-gray-200); padding: 0.5em 0.75em; text-align: left; }
.page-content-wrap th { background: var(--c-gray-100); font-weight: var(--fw-semi); }

/* ── 页面 header section ── */
.page-header-section {
  background: var(--c-gray-100);
  border-bottom: 2px solid var(--c-black);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: calc(var(--unit) * 2) calc(var(--unit) * 4);
  align-items: start;
}

.page-header-section h1 { grid-column: 1; }
.page-header-section .inner-lead { grid-column: 1; }
.page-header-section .breadcrumb { grid-column: 1; }
.page-header-section .ph-aside { grid-column: 2; grid-row: 2 / 5; align-self: center; }
.page-header-section .ph-meta { grid-column: 1 / -1; }

.ph-meta {
  display: flex;
  gap: calc(var(--unit) * 2);
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: calc(var(--unit) * 1);
}

.ph-type {
  font-size: 0.625rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--c-black);
  color: var(--c-white);
  padding: 2px 8px;
}

.ph-date {
  font-size: 0.75rem;
  color: var(--c-gray-400);
}

.inner-h1 {
  font-size: clamp(1.375rem, 2.5vw, 2rem);
  font-weight: var(--fw-bold);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: calc(var(--unit) * 1.5);
}

.inner-lead {
  font-size: 0.938rem;
  color: var(--c-gray-600);
  line-height: 1.6;
  max-width: 58ch;
  margin-bottom: calc(var(--unit) * 1.5);
}

.breadcrumb {
  font-size: 0.75rem;
  color: var(--c-gray-400);
}
.breadcrumb a { color: var(--c-gray-600); border-bottom: 1px solid var(--c-gray-200); }
.breadcrumb a:hover { color: var(--c-black); }

.ph-aside {
  display: flex;
  flex-direction: column;
  gap: calc(var(--unit) * 1);
  align-items: flex-end;
}

.ph-badge {
  display: inline-block;
  font-size: 0.625rem;
  font-weight: var(--fw-semi);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--c-black);
  padding: 3px 8px;
  white-space: nowrap;
}

/* ── 首页卡片区 ── */
.home-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: calc(var(--unit) * 2);
  margin-top: calc(var(--unit) * 2);
}

.home-card {
  background: var(--c-black);
  color: var(--c-white);
  border-radius: var(--radius-card);
  padding: calc(var(--unit) * 3) calc(var(--unit) * 3);
  display: flex;
  flex-direction: column;
  gap: calc(var(--unit) * 1);
  transition: transform 0.2s var(--ease-out), box-shadow 0.2s;
  will-change: transform;
}

.home-card:nth-child(even) {
  background: var(--c-gray-100);
  color: var(--c-black);
}

.home-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,0.15);
}

.card-num {
  font-size: 0.625rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
  opacity: 0.4;
}

.card-title {
  font-size: 0.938rem;
  font-weight: var(--fw-semi);
  line-height: 1.3;
  flex: 1;
}

.card-title a { color: inherit; }
.card-title a:hover { text-decoration: underline; }

.card-desc {
  font-size: 0.75rem;
  opacity: 0.7;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-cta {
  display: inline-block;
  font-size: 0.688rem;
  font-weight: var(--fw-semi);
  letter-spacing: 0.06em;
  padding: calc(var(--unit) * 1) 0;
  border-top: 1px solid currentColor;
  opacity: 0.6;
  transition: opacity 0.15s;
  margin-top: auto;
  min-height: 40px;
  display: flex;
  align-items: center;
}
.card-cta:hover { opacity: 1; text-decoration: none; }

.section-aside {
  font-size: 0.75rem;
  color: var(--c-gray-400);
  margin-bottom: calc(var(--unit) * 2);
}

/* ── 排行 DL ── */
.rank-dl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  max-width: var(--content-max);
}

.rank-dl dt {
  padding: calc(var(--unit) * 1.5) 0;
  font-weight: var(--fw-semi);
  font-size: 0.938rem;
  border-top: 1px solid var(--c-gray-200);
}

.rank-dl dt:first-of-type { border-top: none; }

.rank-dl dt a {
  color: var(--c-black);
  transition: opacity 0.15s;
}
.rank-dl dt a:hover { opacity: 0.6; text-decoration: none; }

.rank-dl dd {
  font-size: 0.813rem;
  color: var(--c-gray-600);
  padding-bottom: calc(var(--unit) * 1.5);
  line-height: 1.5;
}

/* ── 快速列表 ── */
.quick-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: var(--content-max);
  margin-top: calc(var(--unit) * 2);
}

.quick-item {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: calc(var(--unit) * 2);
  align-items: center;
  padding: calc(var(--unit) * 1.5) 0;
  border-bottom: 1px solid var(--c-gray-200);
}

.qi-num {
  font-size: 0.688rem;
  font-weight: var(--fw-bold);
  color: var(--c-gray-400);
  letter-spacing: 0.05em;
}

.qi-link {
  font-size: 0.938rem;
  font-weight: var(--fw-med);
  color: var(--c-black);
  transition: opacity 0.15s;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.qi-link:hover { opacity: 0.6; text-decoration: none; }

/* ── 相关列表 ── */
.related-list {
  display: flex;
  flex-direction: column;
  gap: calc(var(--unit) * 0.5);
  max-width: 480px;
}

.related-list li a {
  display: block;
  padding: calc(var(--unit) * 1.5) calc(var(--unit) * 2);
  font-size: 0.875rem;
  font-weight: var(--fw-med);
  background: var(--c-gray-100);
  transition: background 0.15s;
  min-height: 44px;
  display: flex;
  align-items: center;
}
.related-list li a:hover { background: var(--c-gray-200); text-decoration: none; }

/* ── 装饰元素 ── */
.review-figure, .rr-figure, .cm-figure,
.faq-more-figure, .mission-figure, .pn-figure { margin: 0 0 calc(var(--unit) * 3); }

.review-deco, .rr-deco {
  width: 64px;
  height: 4px;
  background: var(--c-black);
}

.cm-bar-a, .cm-bar-b {
  display: inline-block;
  height: 6px;
  vertical-align: top;
}
.cm-bar-a { width: 80px; background: var(--c-black); margin-right: 4px; }
.cm-bar-b { width: 50px; background: var(--c-gray-400); }

.faq-grid-deco {
  width: 48px; height: 48px;
  background-image: repeating-linear-gradient(
    0deg, var(--c-gray-200) 0px, var(--c-gray-200) 1px, transparent 1px, transparent 8px
  ), repeating-linear-gradient(
    90deg, var(--c-gray-200) 0px, var(--c-gray-200) 1px, transparent 1px, transparent 8px
  );
}

.mission-grid {
  width: 56px; height: 8px;
  background: repeating-linear-gradient(
    90deg, var(--c-black) 0, var(--c-black) 16px, transparent 16px, transparent 24px
  );
}

.rank-stripe {
  width: 80px; height: 4px;
  background: var(--c-black);
}

.pn-line { width: 48px; height: 2px; background: var(--c-black); }

/* ── 对比页 VS 块 ── */
.compare-vs-aside {
  grid-column: 2;
  grid-row: 2 / 5;
  align-self: center;
}

.vs-block {
  display: flex;
  align-items: center;
  gap: calc(var(--unit) * 1);
  padding: calc(var(--unit) * 2);
  border: 1px solid var(--c-black);
}

.vs-label {
  font-size: 1.5rem;
  font-weight: var(--fw-bold);
  line-height: 1;
}

.vs-sep {
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--c-gray-400);
}

/* ── 关于页品牌标记 ── */
.about-figure {
  display: flex;
  align-items: flex-start;
  gap: calc(var(--unit) * 4);
}

.about-brand-mark {
  flex-shrink: 0;
  width: 80px; height: 80px;
  background: var(--c-black);
  display: flex;
  align-items: center;
  justify-content: center;
}

.abm-text {
  color: var(--c-white);
  font-size: 1.25rem;
  font-weight: var(--fw-bold);
  letter-spacing: 0.1em;
}

/* ── 原则列表 ── */
.principle-list {
  display: flex;
  flex-direction: column;
  gap: calc(var(--unit) * 2);
  max-width: 560px;
}

.principle-list li {
  font-size: 0.938rem;
  line-height: 1.6;
  padding-left: calc(var(--unit) * 2);
  border-left: 3px solid var(--c-black);
}

/* ── nav 内 figure/aside 各 section 里的直接子元素满足契约 ── */
.nav-bottom-section > figure,
.review-section > figure,
.related-review-section > figure,
.compare-more-section > figure,
.faq-more-section > figure,
.about-mission-section > figure,
.privacy-note-section > figure,
.rank-section { display: block; }

/* ── Scroll Reveal 动效 ── */
@media (prefers-reduced-motion: no-preference) {
  .home-card,
  .rank-dl dt,
  .quick-item,
  .related-list li,
  .principle-list li {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.4s var(--ease-out), transform 0.4s var(--ease-out);
  }

  .home-card.revealed,
  .rank-dl dt.revealed,
  .quick-item.revealed,
  .related-list li.revealed,
  .principle-list li.revealed {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ── 响应式 ── */
@media (max-width: 960px) {
  .site-wrapper {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto 1fr auto;
  }

  .site-nav-aside {
    grid-column: 1;
    grid-row: 1;
    position: static;
    height: auto;
    flex-direction: row;
    flex-wrap: wrap;
    padding: 0;
    overflow: visible;
  }

  .site-nav-aside nav ul {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .site-nav-aside nav ul li a {
    padding: calc(var(--unit) * 1.5) calc(var(--unit) * 2);
    font-size: 0.75rem;
  }

  .nav-brand a {
    border-bottom: none !important;
    border-right: 1px solid rgba(255,255,255,0.12);
  }

  .nav-search {
    margin: calc(var(--unit) * 1) calc(var(--unit) * 2);
    flex-basis: 100%;
  }

  .home-main,
  .inner-main {
    grid-column: 1;
    grid-row: 2;
  }

  .site-footer {
    grid-column: 1;
    grid-row: 4;
    grid-template-columns: 1fr 1fr;
  }

  .footer-brand { grid-column: 1 / -1; }

  .hero-section {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: calc(var(--unit) * 6) calc(var(--unit) * 3);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: calc(var(--unit) * 4);
  }

  .hero-aside {
    border-left: none;
    border-top: 1px solid rgba(255,255,255,0.15);
    display: flex;
    gap: calc(var(--unit) * 3);
    align-items: center;
    padding: calc(var(--unit) * 2) 0;
  }

  .home-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .content-section {
    grid-template-columns: 1fr;
  }

  .content-aside {
    grid-column: 1;
    grid-row: auto;
    position: static;
  }

  .page-header-section {
    grid-template-columns: 1fr;
  }

  .page-header-section .ph-aside,
  .compare-vs-aside {
    grid-column: 1;
    grid-row: auto;
    align-items: flex-start;
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@media (max-width: 600px) {
  .home-card-grid { grid-template-columns: 1fr; }

  .site-footer {
    grid-template-columns: 1fr;
    padding: calc(var(--unit) * 4) calc(var(--unit) * 3);
  }

  .content-section,
  .cards-section,
  .rank-section,
  .review-section,
  .children-section,
  .nav-bottom-section,
  .related-review-section,
  .compare-more-section,
  .faq-more-section,
  .about-mission-section,
  .privacy-note-section,
  .page-header-section {
    padding: calc(var(--unit) * 4) calc(var(--unit) * 3);
  }

  .hero-section {
    padding: calc(var(--unit) * 5) calc(var(--unit) * 3);
  }

  .hero-h1 { font-size: 1.5rem; }
  .hero-figure { display: none; }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-secondary { width: 100%; justify-content: center; }

  .about-figure { flex-direction: column; }
}

@media (max-width: 375px) {
  body { font-size: 16px; }
  .inner-h1 { font-size: 1.25rem; }
  .home-card { border-radius: 16px; }
}