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

/* =============================================
   CSS 变量 & 重置
   ============================================= */
:root {
  --c-white: #ffffff;
  --c-light: #f5f5f5;
  --c-ink: #1f1f1f;
  --c-ink-80: rgba(31,31,31,0.8);
  --c-ink-40: rgba(31,31,31,0.4);
  --c-ink-10: rgba(31,31,31,0.08);
  --c-accent: #c8a97e;
  --c-accent-light: #ede5d8;

  --shadow-sm: 0 2px 8px rgba(31,31,31,0.08);
  --shadow-md: 0 6px 20px rgba(31,31,31,0.12);
  --shadow-lg: 0 16px 40px rgba(31,31,31,0.16);
  --shadow-xl: 0 32px 72px rgba(31,31,31,0.22);

  --radius-card: 28px;
  --radius-sm: 12px;
  --radius-btn: 8px;

  --font-serif: 'Noto Serif JP', 'Georgia', serif;
  --font-sans: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;

  --aside-w: 220px;
  --header-h: 110px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-ink);
  background: var(--c-white);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol {
  list-style: none;
}

/* =============================================
   空间层叠结构 (Dimensional Layering)
   ============================================= */

/* 整体布局：aside 左侧 + 主内容右侧 */
.site-wrapper {
  display: flex;
  align-items: stretch;
  min-height: 100vh;
  position: relative;
}

/* =============================================
   侧边栏 (aside 在内容左侧)
   ============================================= */
.site-aside {
  width: var(--aside-w);
  min-height: 100vh;
  background: var(--c-ink);
  color: var(--c-white);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 2rem 1.25rem;
  z-index: 40;
  flex-shrink: 0;
  box-shadow: var(--shadow-lg);
}

.site-aside nav ul {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.site-aside nav ul li a {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  padding: 0.6rem 0.75rem;
  border-radius: 6px;
  color: rgba(255,255,255,0.75);
  transition: background var(--transition), color var(--transition);
  line-height: 1.4;
}

.site-aside nav ul li a:hover,
.site-aside nav ul li a:focus {
  background: rgba(255,255,255,0.1);
  color: var(--c-white);
}

.aside-brand {
  margin-top: auto;
}

.aside-brand-text {
  font-family: var(--font-serif);
  font-size: 0.75rem;
  color: rgba(255,255,255,0.3);
  writing-mode: vertical-rl;
  letter-spacing: 0.12em;
}

.aside-related {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
}

.aside-title {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.4);
  text-transform: none;
  margin-bottom: 0.75rem;
}

.aside-related ul {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.aside-related ul li a {
  display: block;
  font-size: 0.78rem;
  color: rgba(255,255,255,0.6);
  padding: 0.4rem 0.5rem;
  border-radius: 4px;
  transition: color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.aside-related ul li a:hover {
  color: var(--c-white);
}

/* =============================================
   主内容列
   ============================================= */
.site-main-col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  position: relative;
}

/* =============================================
   顶部双行 Header
   ============================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--c-white);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--c-ink-10);
}

.header-brand-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--c-ink-10);
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-logo {
  height: 36px;
  width: auto;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--c-ink);
  letter-spacing: 0.06em;
}

.header-contact {
  display: flex;
  align-items: center;
}

.contact-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--c-ink-80);
  padding: 0.55rem 1.2rem;
  border: 1px solid var(--c-ink-10);
  border-radius: var(--radius-btn);
  transition: background var(--transition), color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.contact-link:hover {
  background: var(--c-ink);
  color: var(--c-white);
}

.header-nav-row {
  padding: 0 2rem;
  background: var(--c-light);
}

.header-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}

.header-nav ul li a {
  display: flex;
  align-items: center;
  padding: 0.65rem 1rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--c-ink-80);
  letter-spacing: 0.03em;
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  min-height: 44px;
  white-space: nowrap;
}

.header-nav ul li a:hover,
.header-nav ul li a:focus {
  color: var(--c-ink);
  border-bottom-color: var(--c-ink);
}

/* =============================================
   Hero — 首页 (100vh, 右对齐, 斜切色带)
   ============================================= */
.hero--home {
  position: relative;
  min-height: 100vh;
  background: var(--c-ink);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  overflow: hidden;
  z-index: 1;
}

.hero-inner {
  position: relative;
  z-index: 3;
  padding: 6rem 4rem 6rem 3rem;
  max-width: 640px;
  text-align: right;
}

.hero-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--c-accent);
  margin-bottom: 1.25rem;
  display: block;
}

.hero-h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.6rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-white);
  margin-bottom: 1.5rem;
  letter-spacing: 0.04em;
}

.hero-sub {
  font-size: 1rem;
  color: rgba(255,255,255,0.65);
  line-height: 1.75;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
  flex-wrap: wrap;
}

/* 斜切色带装饰 */
.hero-slash {
  position: absolute;
  left: 0;
  top: 0;
  width: 55%;
  height: 100%;
  background: linear-gradient(135deg, var(--c-accent-light) 0%, rgba(200,169,126,0.15) 60%, transparent 100%);
  transform: skewX(-8deg) translateX(-10%);
  z-index: 2;
  pointer-events: none;
}

.hero-slash--sm {
  height: 8px;
  width: 100%;
  position: absolute;
  bottom: 0;
  left: 0;
  transform: none;
  background: linear-gradient(90deg, var(--c-accent) 0%, var(--c-ink-10) 100%);
}

/* =============================================
   页面 Hero (非首页)
   ============================================= */
.page-hero {
  position: relative;
  background: var(--c-ink);
  padding: 5rem 4rem 4rem;
  overflow: hidden;
  z-index: 1;
}

.page-hero-inner {
  position: relative;
  z-index: 3;
  max-width: 760px;
}

.page-hero-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  font-weight: 700;
  color: var(--c-white);
  line-height: 1.25;
  margin-top: 0.75rem;
  letter-spacing: 0.03em;
}

.page-hero-desc {
  color: rgba(255,255,255,0.65);
  font-size: 1rem;
  line-height: 1.7;
  margin-top: 1rem;
  max-width: 600px;
}

/* =============================================
   Main / Article / Section 结构
   ============================================= */
main {
  flex: 1;
  background: var(--c-white);
}

main > div {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 2rem;
  position: relative;
  z-index: 2;
}

main > div > article {
  margin-bottom: 4rem;
}

/* =============================================
   Breadcrumb
   ============================================= */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  color: var(--c-ink-40);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--c-ink-80);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--c-ink);
}

/* =============================================
   Article Header
   ============================================= */
.article-header {
  margin-bottom: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--c-ink-10);
}

.article-header--compact {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.article-eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-accent);
  margin-bottom: 0.75rem;
}

.article-h1 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--c-ink);
  letter-spacing: 0.03em;
  margin-top: 0.5rem;
}

.article-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.meta-date {
  font-size: 0.8rem;
  color: var(--c-ink-40);
  font-weight: 400;
}

/* =============================================
   Section Header (small + h2 结构)
   ============================================= */
.section-header {
  margin-bottom: 2rem;
}

/* small 紧邻 h2 前 */
.section-header small.section-eyebrow,
small.section-eyebrow {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--c-accent);
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
  font-weight: 700;
  color: var(--c-ink);
  letter-spacing: 0.03em;
  line-height: 1.3;
  position: relative;
  padding-left: 1rem;
}

.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.1em;
  bottom: 0.1em;
  width: 3px;
  background: var(--c-accent);
  border-radius: 2px;
}

/* =============================================
   Prose (正文)
   ============================================= */
.prose {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--c-ink);
}

.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  margin: 2.5rem 0 1rem;
  color: var(--c-ink);
  letter-spacing: 0.03em;
}

.prose h3 {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: var(--c-ink);
}

.prose h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 1.5rem 0 0.5rem;
}

.prose p {
  margin-bottom: 1.25rem;
}

.prose ul, .prose ol {
  list-style: disc;
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: 0.5rem;
}

.prose strong {
  font-weight: 700;
}

.prose em {
  font-style: italic;
}

.prose blockquote {
  border-left: 3px solid var(--c-accent);
  padding: 0.75rem 1.25rem;
  background: var(--c-light);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
  color: var(--c-ink-80);
  font-style: italic;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.prose th, .prose td {
  border: 1px solid var(--c-ink-10);
  padding: 0.6rem 0.9rem;
  text-align: left;
}

.prose th {
  background: var(--c-light);
  font-weight: 700;
}

.prose a {
  color: var(--c-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--transition);
}

.prose a:hover {
  opacity: 0.65;
}

.prose img {
  border-radius: var(--radius-sm);
  margin: 1.5rem 0;
}

/* =============================================
   Cards
   ============================================= */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.cards-grid--sm {
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
}

/* Dimensional layering 卡片 */
.layer-card {
  background: var(--c-white);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 2;
  transition: box-shadow var(--transition), transform var(--transition);
  overflow: hidden;
}

.layer-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px) translateZ(0);
  z-index: 3;
}

.card {
  display: flex;
  flex-direction: column;
}

.card--sm .card-body {
  padding: 1.25rem;
}

.card-media {
  overflow: hidden;
  border-radius: var(--radius-card) var(--radius-card) 0 0;
  aspect-ratio: 16/9;
}

.card-media img,
.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.layer-card:hover .card-img {
  transform: scale(1.04);
}

.card-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.card-eyebrow {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--c-accent);
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
}

.card-title a {
  color: var(--c-ink);
  transition: color var(--transition);
}

.card-title a:hover {
  color: var(--c-ink-80);
}

.card-desc {
  font-size: 0.88rem;
  color: var(--c-ink-80);
  line-height: 1.6;
  flex: 1;
}

.card-date {
  font-size: 0.78rem;
  color: var(--c-ink-40);
}

/* =============================================
   Highlight Card
   ============================================= */
.highlight-card {
  padding: 2.5rem;
  background: var(--c-light);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.highlight-card h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
}

.highlight-card h3 a {
  color: var(--c-ink);
  transition: opacity var(--transition);
}

.highlight-card h3 a:hover {
  opacity: 0.7;
}

.highlight-card p {
  font-size: 0.95rem;
  color: var(--c-ink-80);
  line-height: 1.7;
}

/* =============================================
   Ranking List
   ============================================= */
.rank-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.rank-card {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  background: var(--c-white);
  position: relative;
}

.rank-num {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--c-ink-10);
  line-height: 1;
  flex-shrink: 0;
  min-width: 3rem;
  user-select: none;
}

.rank-media {
  width: 120px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.rank-img {
  width: 100%;
  height: 80px;
  object-fit: cover;
}

.rank-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.rank-title {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
}

.rank-title a {
  color: var(--c-ink);
  transition: color var(--transition);
}

.rank-title a:hover {
  color: var(--c-ink-80);
}

.rank-desc {
  font-size: 0.88rem;
  color: var(--c-ink-80);
  line-height: 1.6;
}

.rank-date {
  font-size: 0.78rem;
  color: var(--c-ink-40);
}

/* =============================================
   DL 列表 (子页/FAQ/导航)
   ============================================= */
dl.nav-dl,
dl.compare-dl,
dl.about-dl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
}

dl.nav-dl dt,
dl.compare-dl dt,
dl.about-dl dt {
  padding: 1rem 0 0.25rem;
  border-top: 1px solid var(--c-ink-10);
  margin-top: 0.5rem;
}

dl.nav-dl dt:first-child,
dl.compare-dl dt:first-child,
dl.about-dl dt:first-child {
  border-top: none;
  margin-top: 0;
}

dl.nav-dl dt a,
dl.compare-dl dt a,
dl.about-dl dt a {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--c-ink);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--transition);
}

dl.nav-dl dt a:hover,
dl.compare-dl dt a:hover,
dl.about-dl dt a:hover {
  opacity: 0.65;
}

dl.nav-dl dd,
dl.compare-dl dd,
dl.about-dl dd {
  font-size: 0.9rem;
  color: var(--c-ink-80);
  line-height: 1.65;
  padding-bottom: 0.75rem;
}

/* =============================================
   Buttons
   ============================================= */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  background: var(--c-ink);
  color: var(--c-white);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius-btn);
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
  min-height: 48px;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background: #333;
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  background: transparent;
  color: var(--c-ink);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  border-radius: var(--radius-btn);
  border: 2px solid var(--c-ink-10);
  transition: border-color var(--transition), background var(--transition);
  min-height: 48px;
}

.btn-ghost:hover {
  border-color: var(--c-ink);
  background: var(--c-light);
}

.btn-sm {
  display: inline-flex;
  align-items: center;
  padding: 0.4rem 1rem;
  background: var(--c-light);
  color: var(--c-ink);
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: var(--radius-btn);
  transition: background var(--transition);
  min-height: 36px;
}

.btn-sm:hover {
  background: var(--c-ink-10);
}

/* =============================================
   Review Hero Image
   ============================================= */
.review-hero-media {
  width: 100%;
  max-height: 420px;
  overflow: hidden;
  position: relative;
}

.review-hero-img {
  width: 100%;
  height: 420px;
  object-fit: cover;
}

/* =============================================
   Back Section
   ============================================= */
.back-section {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  padding-top: 2rem;
  border-top: 1px solid var(--c-ink-10);
  margin-top: 1rem;
}

/* =============================================
   Footer — 四栏结构
   ============================================= */
.site-footer {
  background: var(--c-ink);
  color: var(--c-white);
  position: relative;
  z-index: 10;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding: 4rem 3rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand-block {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-brand-big {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--c-white);
  letter-spacing: 0.04em;
}

.footer-tagline {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.45);
  line-height: 1.6;
}

.footer-col-title {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 1rem;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.footer-col ul li a {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}

.footer-col ul li a:hover {
  color: var(--c-white);
}

.footer-col address {
  margin-top: 1.25rem;
  font-style: normal;
}

.footer-contact-link {
  font-size: 0.82rem;
  color: var(--c-accent);
  transition: opacity var(--transition);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.footer-contact-link:hover {
  opacity: 0.75;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 3rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
}

.footer-bottom-links {
  display: flex;
  gap: 1.5rem;
}

.footer-bottom-links li a {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.45);
  transition: color var(--transition);
  min-height: 40px;
  display: inline-flex;
  align-items: center;
}

.footer-bottom-links li a:hover {
  color: var(--c-white);
}

/* =============================================
   Misc Sections
   ============================================= */
.prose-section .prose {
  background: var(--c-white);
}

.highlight-section,
.cards-section,
.rank-list-section,
.related-section,
.nav-section,
.about-links-section,
.faq-section,
.back-section {
  position: relative;
  z-index: 2;
}

.empty-note {
  color: var(--c-ink-40);
  font-size: 0.9rem;
  padding: 2rem 0;
}

/* =============================================
   Scroll Reveal Animation
   ============================================= */
@media (prefers-reduced-motion: no-preference) {
  .layer-card {
    animation: none;
  }

  .reveal {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .reveal.visible {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }

  * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}

/* =============================================
   Elevation / Z-index Layers
   ============================================= */
.z-1 { z-index: 1; }
.z-2 { z-index: 2; }
.z-3 { z-index: 3; }
.z-4 { z-index: 4; }

/* =============================================
   Backdrop Blur (for floating elements)
   ============================================= */
.backdrop-float {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(255,255,255,0.85);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-xl);
}

/* =============================================
   Responsive — Tablet
   ============================================= */
@media (max-width: 1024px) {
  :root {
    --aside-w: 180px;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 3rem 2rem;
  }

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

  .hero-inner {
    padding: 4rem 2.5rem;
  }

  .page-hero {
    padding: 3.5rem 2rem 3rem;
  }

  main > div {
    padding: 2.5rem 1.5rem;
  }
}

/* =============================================
   Responsive — Mobile (≤768px)
   ============================================= */
@media (max-width: 768px) {
  :root {
    --aside-w: 0px;
  }

  .site-wrapper {
    flex-direction: column;
  }

  .site-aside {
    width: 100%;
    min-height: auto;
    height: auto;
    position: static;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem 1.25rem;
    overflow: visible;
  }

  .site-aside nav {
    flex: 1;
    min-width: 200px;
  }

  .site-aside nav ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.25rem;
  }

  .site-aside nav ul li a {
    font-size: 0.75rem;
    padding: 0.5rem 0.6rem;
    min-height: 40px;
    display: flex;
    align-items: center;
  }

  .aside-brand {
    display: none;
  }

  .aside-related {
    border-top: none;
    border-left: 1px solid rgba(255,255,255,0.1);
    padding-top: 0;
    padding-left: 1rem;
    min-width: 140px;
  }

  .aside-related ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.2rem;
  }

  .aside-related ul li a {
    font-size: 0.72rem;
    padding: 0.35rem 0.5rem;
    min-height: 36px;
  }

  .header-brand-row {
    padding: 0.875rem 1.25rem;
  }

  .brand-name {
    font-size: 1rem;
  }

  .header-nav-row {
    padding: 0 1rem;
  }

  .header-nav ul {
    overflow-x: auto;
    flex-wrap: nowrap;
    scrollbar-width: none;
  }

  .header-nav ul::-webkit-scrollbar {
    display: none;
  }

  .header-nav ul li a {
    white-space: nowrap;
    font-size: 0.78rem;
    padding: 0.55rem 0.75rem;
  }

  .hero--home {
    min-height: 100vh;
    justify-content: center;
  }

  .hero-inner {
    padding: 6rem 1.5rem 4rem;
    text-align: left;
    max-width: 100%;
  }

  .hero-h1 {
    font-size: clamp(1.6rem, 6vw, 2.2rem);
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .hero-slash {
    display: none;
  }

  .page-hero {
    padding: 2.5rem 1.25rem 2rem;
  }

  .page-hero-h1 {
    font-size: clamp(1.3rem, 5vw, 1.9rem);
  }

  main > div {
    padding: 2rem 1.25rem;
  }

  .cards-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .rank-card {
    flex-wrap: wrap;
    padding: 1.25rem;
    gap: 1rem;
  }

  .rank-num {
    font-size: 1.8rem;
    min-width: 2rem;
  }

  .rank-media {
    width: 80px;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    padding: 2.5rem 1.25rem;
    gap: 1.5rem;
  }

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

  .footer-brand-big {
    font-size: clamp(1.5rem, 6vw, 2.2rem);
  }

  .footer-bottom {
    padding: 1rem 1.25rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }

  .footer-bottom-links {
    gap: 1rem;
    flex-wrap: wrap;
  }

  .back-section {
    flex-direction: column;
  }

  .back-section .btn-primary,
  .back-section .btn-ghost {
    width: 100%;
    justify-content: center;
  }
}

/* =============================================
   Mobile 375px 特化
   ============================================= */
@media (max-width: 400px) {
  .footer-top {
    grid-template-columns: 1fr;
  }

  .hero-h1 {
    font-size: 1.5rem;
  }

  .page-hero-h1 {
    font-size: 1.3rem;
  }

  .section-title {
    font-size: 1.2rem;
  }

  .cards-grid--sm {
    grid-template-columns: 1fr;
  }
}