:root {
  --sakura-primary: #D6336C;
  --sakura-primary-dark: #B02A5B;
  --sakura-primary-light: #F783AC;
  --sakura-accent: #FF8FAB;
  --sakura-accent-2: #FFC2D1;
  --sakura-bg: #FFF5F8;
  --sakura-bg-alt: #FFFFFF;
  --sakura-surface: rgba(255, 255, 255, 0.72);
  --sakura-surface-solid: #FFFFFF;
  --sakura-border: rgba(214, 51, 108, 0.14);
  --sakura-text: #2B1B22;
  --sakura-text-soft: #6B4A56;
  --sakura-text-muted: #96707E;
  --sakura-shadow-sm: 0 2px 10px rgba(214, 51, 108, 0.08);
  --sakura-shadow-md: 0 8px 30px rgba(214, 51, 108, 0.12);
  --sakura-shadow-lg: 0 18px 50px rgba(214, 51, 108, 0.18);
  --sakura-radius-sm: 10px;
  --sakura-radius: 18px;
  --sakura-radius-lg: 28px;
  --sakura-radius-pill: 999px;
  --sakura-blur: 16px;
  --sakura-transition: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --sakura-max: 1200px;
  --sakura-gradient: linear-gradient(135deg, #D6336C 0%, #F06292 45%, #FF8FAB 100%);
  --sakura-gradient-soft: linear-gradient(135deg, rgba(214, 51, 108, 0.12), rgba(255, 143, 171, 0.18));
}

[data-theme="dark"] {
  --sakura-bg: #16101A;
  --sakura-bg-alt: #1E1622;
  --sakura-surface: rgba(38, 26, 40, 0.66);
  --sakura-surface-solid: #241A29;
  --sakura-border: rgba(255, 143, 171, 0.18);
  --sakura-text: #F6E9F0;
  --sakura-text-soft: #D9BFCC;
  --sakura-text-muted: #A88A99;
  --sakura-shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
  --sakura-shadow-md: 0 8px 30px rgba(0, 0, 0, 0.5);
  --sakura-shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.6);
  --sakura-gradient: linear-gradient(135deg, #8C1F4A 0%, #C22A63 45%, #E85C8E 100%);
  --sakura-gradient-soft: linear-gradient(135deg, rgba(214, 51, 108, 0.22), rgba(255, 143, 171, 0.12));
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--sakura-text);
  background-color: var(--sakura-bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255, 143, 171, 0.22), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(214, 51, 108, 0.16), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(255, 194, 209, 0.18), transparent 55%);
  background-attachment: fixed;
  overflow-x: hidden;
  transition: background-color var(--sakura-transition), color var(--sakura-transition);
}

img,
svg {
  max-width: 100%;
  display: block;
}

a {
  color: var(--sakura-primary);
  text-decoration: none;
  transition: color var(--sakura-transition), opacity var(--sakura-transition);
}

a:hover,
a:focus-visible {
  color: var(--sakura-primary-dark);
  opacity: 0.92;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--sakura-primary);
  outline-offset: 2px;
  border-radius: 6px;
}

h1,
h2,
h3,
h4 {
  color: var(--sakura-text);
  line-height: 1.35;
  font-weight: 800;
  letter-spacing: 0.01em;
  margin: 0 0 0.6em;
}

h1 {
  font-size: clamp(1.75rem, 4.2vw, 2.75rem);
}

h2 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--sakura-radius-pill);
  background: var(--sakura-gradient);
  box-shadow: 0 0 12px rgba(214, 51, 108, 0.5);
}

h3 {
  font-size: clamp(1.1rem, 2.2vw, 1.35rem);
}

p {
  margin: 0 0 1em;
  color: var(--sakura-text-soft);
}

ul,
ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
  color: var(--sakura-text-soft);
}

li {
  margin-bottom: 0.5em;
}

strong {
  color: var(--sakura-primary);
  font-weight: 700;
}

blockquote {
  margin: 1em 0;
  padding: 1em 1.2em;
  border-left: 4px solid var(--sakura-primary);
  border-radius: 0 var(--sakura-radius) var(--sakura-radius) 0;
  background: var(--sakura-gradient-soft);
  backdrop-filter: blur(var(--sakura-blur));
  -webkit-backdrop-filter: blur(var(--sakura-blur));
  color: var(--sakura-text);
  font-style: italic;
}

blockquote p {
  margin: 0;
  color: var(--sakura-text);
}

/* ============ HEADER ============ */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  padding: 12px clamp(16px, 4vw, 40px);
  background: var(--sakura-surface);
  backdrop-filter: blur(var(--sakura-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--sakura-blur)) saturate(180%);
  border-bottom: 1px solid var(--sakura-border);
  box-shadow: var(--sakura-shadow-sm);
  transition: background var(--sakura-transition), box-shadow var(--sakura-transition);
}

header[role="banner"] > a {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  border-radius: var(--sakura-radius-sm);
  transition: transform var(--sakura-transition);
}

header[role="banner"] > a:hover {
  transform: translateY(-2px) scale(1.02);
}

header[role="banner"] > a svg {
  width: 160px;
  height: 48px;
  filter: drop-shadow(0 4px 12px rgba(214, 51, 108, 0.35));
}

nav[aria-label="主导航"] {
  flex: 1 1 auto;
  min-width: 0;
}

nav[aria-label="主导航"] ul {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

nav[aria-label="主导航"] li {
  margin: 0;
}

nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 7px 13px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--sakura-text-soft);
  border-radius: var(--sakura-radius-pill);
  transition: all var(--sakura-transition);
  position: relative;
}

nav[aria-label="主导航"] a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  border-radius: var(--sakura-radius-pill);
  background: var(--sakura-gradient);
  transform: translateX(-50%);
  transition: width var(--sakura-transition);
}

nav[aria-label="主导航"] a:hover,
nav[aria-label="主导航"] a:focus-visible {
  color: var(--sakura-primary);
  background: var(--sakura-gradient-soft);
  opacity: 1;
}

nav[aria-label="主导航"] a:hover::after {
  width: 60%;
}

form[role="search"] {
  flex: 0 1 300px;
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  position: relative;
}

form[role="search"] label {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

form[role="search"] input[type="search"] {
  flex: 1 1 auto;
  min-width: 0;
  padding: 9px 16px;
  font-size: 0.9rem;
  color: var(--sakura-text);
  background: var(--sakura-surface-solid);
  border: 1px solid var(--sakura-border);
  border-radius: var(--sakura-radius-pill);
  transition: all var(--sakura-transition);
}

form[role="search"] input[type="search"]::placeholder {
  color: var(--sakura-text-muted);
}

form[role="search"] input[type="search"]:focus {
  border-color: var(--sakura-primary);
  box-shadow: 0 0 0 4px rgba(214, 51, 108, 0.14);
  outline: none;
}

form[role="search"] button {
  flex: 0 0 auto;
  padding: 9px 18px;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  background: var(--sakura-gradient);
  border: none;
  border-radius: var(--sakura-radius-pill);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(214, 51, 108, 0.32);
  transition: all var(--sakura-transition);
}

form[role="search"] button:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(214, 51, 108, 0.44);
}

form[role="search"] button:active {
  transform: translateY(0);
}

#theme-toggle,
#menu-toggle {
  flex: 0 0 auto;
  padding: 9px 16px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--sakura-primary);
  background: var(--sakura-surface-solid);
  border: 1px solid var(--sakura-border);
  border-radius: var(--sakura-radius-pill);
  cursor: pointer;
  transition: all var(--sakura-transition);
  white-space: nowrap;
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: #fff;
  background: var(--sakura-gradient);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(214, 51, 108, 0.35);
}

#menu-toggle {
  display: none;
}

/* ============ MAIN ============ */
main {
  display: block;
  max-width: var(--sakura-max);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 40px) 60px;
}

section {
  margin: 0 0 clamp(36px, 6vw, 68px);
  animation: sakura-fade-up 0.7s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

section > h2 {
  margin-top: 0;
}

/* ============ HERO ============ */
#hero {
  position: relative;
  margin: clamp(20px, 4vw, 40px) 0 clamp(36px, 6vw, 68px);
  padding: clamp(32px, 6vw, 64px) clamp(22px, 5vw, 56px);
  border-radius: var(--sakura-radius-lg);
  background: var(--sakura-gradient);
  background-size: 200% 200%;
  color: #fff;
  overflow: hidden;
  box-shadow: var(--sakura-shadow-lg);
  animation: sakura-gradient-shift 14s ease infinite, sakura-fade-up 0.8s cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(255, 255, 255, 0.28), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(255, 255, 255, 0.18), transparent 42%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  filter: blur(6px);
  pointer-events: none;
  animation: sakura-float 9s ease-in-out infinite;
}

#hero > * {
  position: relative;
  z-index: 1;
}

#hero h1 {
  color: #fff;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.22);
  margin-bottom: 0.5em;
}

#hero p {
  color: rgba(255, 255, 255, 0.94);
  max-width: 900px;
  font-size: clamp(0.95rem, 1.6vw, 1.05rem);
}

#hero p a {
  color: #fff;
  font-weight: 700;
  border-bottom: 2px solid rgba(255, 255, 255, 0.5);
  padding-bottom: 1px;
  transition: all var(--sakura-transition);
}

#hero p a:hover {
  border-bottom-color: #fff;
  opacity: 1;
  text-shadow: 0 0 12px rgba(255, 255, 255, 0.7);
}

#hero > div[aria-label="平台数据概览"] {
  margin-top: clamp(24px, 4vw, 36px);
}

#hero > div[aria-label="平台数据概览"] ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

#hero > div[aria-label="平台数据概览"] li {
  margin: 0;
  padding: 16px 18px;
  border-radius: var(--sakura-radius);
  background: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(var(--sakura-blur)) saturate(160%);
  -webkit-backdrop-filter: blur(var(--sakura-blur)) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.9rem;
  text-align: center;
  transition: all var(--sakura-transition);
}

#hero > div[aria-label="平台数据概览"] li:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.26);
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.22);
}

#hero > div[aria-label="平台数据概览"] li strong {
  display: block;
  font-size: clamp(1.4rem, 3vw, 1.9rem);
  color: #fff;
  font-weight: 800;
  margin-bottom: 2px;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.25);
}

/* ============ BREADCRUMB ============ */
nav[aria-label="面包屑导航"] {
  margin: -20px 0 32px;
  animation: none;
}

nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 10px 18px;
  list-style: none;
  font-size: 0.85rem;
  border-radius: var(--sakura-radius-pill);
  background: var(--sakura-surface);
  backdrop-filter: blur(var(--sakura-blur));
  -webkit-backdrop-filter: blur(var(--sakura-blur));
  border: 1px solid var(--sakura-border);
  box-shadow: var(--sakura-shadow-sm);
}

nav[aria-label="面包屑导航"] li {
  margin: 0;
  color: var(--sakura-text-muted);
}

nav[aria-label="面包屑导航"] li + li::before {
  content: "›";
  margin-right: 8px;
  color: var(--sakura-primary-light);
  font-weight: 700;
}

nav[aria-label="面包屑导航"] li[aria-current="page"] {
  color: var(--sakura-primary);
  font-weight: 700;
}

/* ============ CARDS / SECTIONS ============ */
#brand,
#products,
#solutions,
#cases,
#news,
#articles,
#faq,
#howto,
#contact,
#sitemap,
#links {
  padding: clamp(24px, 4vw, 44px) clamp(20px, 4vw, 44px);
  border-radius: var(--sakura-radius-lg);
  background: var(--sakura-surface);
  backdrop-filter: blur(var(--sakura-blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--sakura-blur)) saturate(150%);
  border: 1px solid var(--sakura-border);
  box-shadow: var(--sakura-shadow-md);
  transition: box-shadow var(--sakura-transition), transform var(--sakura-transition);
}

#brand:hover,
#products:hover,
#solutions:hover,
#cases:hover,
#news:hover,
#articles:hover,
#faq:hover,
#howto:hover,
#contact:hover,
#sitemap:hover,
#links:hover {
  box-shadow: var(--sakura-shadow-lg);
}

#brand h3,
#products h3,
#solutions h3,
#cases h3,
#howto h3,
#contact h3 {
  margin-top: 1.6em;
  padding-bottom: 0.4em;
  border-bottom: 2px dashed var(--sakura-border);
  color: var(--sakura-primary);
}

#brand h3:first-of-type,
#products h3:first-of-type,
#solutions h3:first-of-type,
#cases h3:first-of-type,
#howto h3:first-of-type,
#contact h3:first-of-type {
  margin-top: 1.2em;
}

/* ============ PRODUCTS LIST ============ */
#products ul,
#howto ul {
  list-style: none;
  padding-left: 0;
}

#products ul li,
#howto ul li {
  position: relative;
  padding: 10px 14px 10px 40px;
  margin-bottom: 10px;
  border-radius: var(--sakura-radius-sm);
  background: var(--sakura-gradient-soft);
  border: 1px solid var(--sakura-border);
  transition: all var(--sakura-transition);
}

#products ul li::before,
#howto ul li::before {
  content: "✿";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--sakura-primary);
  font-size: 1rem;
}

#products ul li:hover,
#howto ul li:hover {
  transform: translateX(6px);
  box-shadow: var(--sakura-shadow-sm);
  border-color: var(--sakura-primary-light);
}

/* ============ CASES ============ */
#cases blockquote {
  transition: transform var(--sakura-transition), box-shadow var(--sakura-transition);
}

#cases blockquote:hover {
  transform: translateY(-4px);
  box-shadow: var(--sakura-shadow-md);
}

/* ============ NEWS ============ */
#news article {
  position: relative;
  margin-bottom: 18px;
  padding: 20px 22px;
  border-radius: var(--sakura-radius);
  background: var(--sakura-surface-solid);
  border: 1px solid var(--sakura-border);
  border-left: 5px solid var(--sakura-primary);
  box-shadow: var(--sakura-shadow-sm);
  transition: all var(--sakura-transition);
  overflow: hidden;
}

#news article::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--sakura-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--sakura-transition);
}

#news article:hover {
  transform: translateY(-5px);
  box-shadow: var(--sakura-shadow-md);
  border-left-color: var(--sakura-primary-dark);
}

#news article:hover::after {
  transform: scaleX(1);
}

#news article h3 {
  margin: 0 0 6px;
  color: var(--sakura-text);
  font-size: 1.1rem;
}

#news article p:first-of-type {
  font-size: 0.82rem;
  color: var(--sakura-primary);
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 0.02em;
}

#news article p:last-child {
  margin-bottom: 0;
}

/* ============ ARTICLES ============ */
#articles {
  display: block;
}

#articles > p {
  margin-bottom: 1.6em;
}

#articles article {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
  padding: 20px 22px;
  border-radius: var(--sakura-radius);
  background: var(--sakura-surface-solid);
  border: 1px solid var(--sakura-border);
  box-shadow: var(--sakura-shadow-sm);
  transition: all var(--sakura-transition);
  position: relative;
  overflow: hidden;
}

#articles article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--sakura-gradient);
  border-radius: var(--sakura-radius-pill);
  transform: scaleY(0.3);
  transform-origin: top;
  transition: transform var(--sakura-transition);
}

#articles article:hover {
  transform: translateY(-5px) scale(1.005);
  box-shadow: var(--sakura-shadow-md);
  border-color: var(--sakura-primary-light);
}

#articles article:hover::before {
  transform: scaleY(1);
}

#articles article h3 {
  margin: 0 0 6px;
  color: var(--sakura-text);
  font-size: 1.08rem;
  transition: color var(--sakura-transition);
}

#articles article:hover h3 {
  color: var(--sakura-primary);
}

#articles article p:first-of-type {
  font-size: 0.82rem;
  color: var(--sakura-primary);
  font-weight: 700;
  margin-bottom: 8px;
}

#articles article p {
  margin-bottom: 8px;
}

#articles article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  align-self: flex-start;
  margin-top: 4px;
  padding: 7px 16px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: var(--sakura-gradient);
  border-radius: var(--sakura-radius-pill);
  box-shadow: 0 4px 14px rgba(214, 51, 108, 0.28);
  transition: all var(--sakura-transition);
}

#articles article a::after {
  content: "→";
  transition: transform var(--sakura-transition);
}

#articles article a:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(214, 51, 108, 0.42);
  opacity: 1;
}

#articles article a:hover::after {
  transform: translateX(4px);
}

/* ============ FAQ ============ */
#faq details {
  margin-bottom: 12px;
  border-radius: var(--sakura-radius);
  background: var(--sakura-surface-solid);
  border: 1px solid var(--sakura-border);
  box-shadow: var(--sakura-shadow-sm);
  overflow: hidden;
  transition: all var(--sakura-transition);
}

#faq details:hover {
  border-color: var(--sakura-primary-light);
  box-shadow: var(--sakura-shadow-md);
}

#faq details[open] {
  border-color: var(--sakura-primary);
  box-shadow: var(--sakura-shadow-md);
}

#faq summary {
  position: relative;
  padding: 16px 52px 16px 20px;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--sakura-text);
  cursor: pointer;
  list-style: none;
  transition: all var(--sakura-transition);
  user-select: none;
}

#faq summary::-webkit-details-marker {
  display: none;
}

#faq summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  background: var(--sakura-gradient);
  border-radius: 50%;
  transition: all var(--sakura-transition);
  line-height: 1;
}

#faq details[open] summary {
  color: var(--sakura-primary);
  background: var(--sakura-gradient-soft);
}

#faq details[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

#faq summary:hover {
  color: var(--sakura-primary);
}

#faq details p {
  margin: 0;
  padding: 0 20px 18px;
  font-size: 0.92rem;
  animation: sakura-fade-up 0.4s ease both;
}

/* ============ HOWTO ============ */
#howto ol {
  counter-reset: howto-step;
  list-style: none;
  padding-left: 0;
}

#howto ol li {
  position: relative;
  counter-increment: howto-step;
  padding: 14px 18px 14px 60px;
  margin-bottom: 12px;
  border-radius: var(--sakura-radius-sm);
  background: var(--sakura-surface-solid);
  border: 1px solid var(--sakura-border);
  box-shadow: var(--sakura-shadow-sm);
  transition: all var(--sakura-transition);
}

#howto ol li::before {
  content: counter(howto-step);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 800;
  color: #fff;
  background: var(--sakura-gradient);
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(214, 51, 108, 0.32);
  transition: all var(--sakura-transition);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: var(--sakura-shadow-md);
  border-color: var(--sakura-primary-light);
}

#howto ol li:hover::before {
  transform: translateY(-50%) scale(1.12) rotate(8deg);
}

/* ============ CONTACT ============ */
#contact ul {
  list-style: none;
  padding-left: 0;
}

#contact ul li {
  position: relative;
  padding: 10px 14px 10px 34px;
  margin-bottom: 8px;
  border-radius: var(--sakura-radius-sm);
  background: var(--sakura-gradient-soft);
  border: 1px solid var(--sakura-border);
  transition: all var(--sakura-transition);
}

#contact ul li::before {
  content: "◆";
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--sakura-primary);
  font-size: 0.7rem;
}

#contact ul li:hover {
  transform: translateX(6px);
  box-shadow: var(--sakura-shadow-sm);
}

/* ============ SITEMAP & LINKS ============ */
#sitemap ul,
#links ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  list-style: none;
  padding-left: 0;
  margin: 0;
}

#sitemap li,
#links li {
  margin: 0;
}

#sitemap a,
#links a {
  display: block;
  padding: 12px 16px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--sakura-text-soft);
  background: var(--sakura-surface-solid);
  border: 1px solid var(--sakura-border);
  border-radius: var(--sakura-radius-sm);
  text-align: center;
  transition: all var(--sakura-transition);
  position: relative;
  overflow: hidden;
}

#sitemap a::before,
#links a::before {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--sakura-gradient);
  opacity: 0;
  transition: opacity var(--sakura-transition);
  z-index: -1;
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  transform: translateY(-4px);
  border-color: transparent;
  box-shadow: 0 10px 24px rgba(214, 51, 108, 0.32);
  opacity: 1;
}

#sitemap a:hover::before,
#links a:hover::before {
  opacity: 1;
}

/* ============ FOOTER ============ */
footer[role="contentinfo"] {
  position: relative;
  margin-top: 20px;
  padding: clamp(36px, 6vw, 60px) clamp(16px, 4vw, 40px) 40px;
  background: var(--sakura-gradient);
  color: #fff;
  overflow: hidden;
}

footer[role="contentinfo"]::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 20%, rgba(255, 255, 255, 0.18), transparent 42%),
    radial-gradient(circle at 85% 80%, rgba(255, 255, 255, 0.14), transparent 45%);
  pointer-events: none;
}

footer[role="contentinfo"] > section {
  position: relative;
  z-index: 1;
  max-width: var(--sakura-max);
  margin: 0 auto 26px;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  animation: sakura-fade-up 0.7s ease both;
}

footer[role="contentinfo"] > section:last-child {
  margin-bottom: 0;
}

footer[role="contentinfo"] h2 {
  padding-left: 0;
  font-size: 1.05rem;
  color: #fff;
  margin-bottom: 0.5em;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
}

footer[role="contentinfo"] h2::before {
  display: none;
}

footer[role="contentinfo"] p,
footer[role="contentinfo"] li {
  color: rgba(255, 255, 255, 0.92);
  font-size: 0.9rem;
}

footer[role="contentinfo"] ul {
  list-style: none;
  padding-left: 0;
}

footer[role="contentinfo"] ul li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 6px;
}

footer[role="contentinfo"] ul li::before {
  content: "·";
  position: absolute;
  left: 4px;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 700;
}

footer[role="contentinfo"] a {
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.4);
}

footer[role="contentinfo"] a:hover {
  border-bottom-color: #fff;
  opacity: 1;
}

/* ============ BACK TO TOP ============ */
#back-to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 90;
  padding: 12px 18px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
  background: var(--sakura-gradient);
  border: none;
  border-radius: var(--sakura-radius-pill);
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(214, 51, 108, 0.4);
  transition: all var(--sakura-transition);
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

#back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 14px 34px rgba(214, 51, 108, 0.55);
}

/* ============ ANIMATIONS ============ */
@keyframes sakura-fade-up {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sakura-gradient-shift {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

@keyframes sakura-float {
  0%,
  100% {
    transform: translateY(0) scale(1);
  }
  50% {
    transform: translateY(18px) scale(1.06);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ SCROLL REVEAL ============ */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 0.61, 0.36, 1), transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

/* ============ RESPONSIVE ============ */
@media (max-width: 1024px) {
  header[role="banner"] {
    gap: 12px 16px;
  }

  nav[aria-label="主导航"] ul {
    gap: 2px 4px;
  }

  nav[aria-label="主导航"] a {
    padding: 6px 10px;
    font-size: 0.85rem;
  }

  form[role="search"] {
    flex: 1 1 100%;
    order: 10;
  }
}

@media (max-width: 768px) {
  html {
    scroll-padding-top: 76px;
  }

  body {
    font-size: 15px;
  }

  header[role="banner"] {
    padding: 10px 16px;
    gap: 10px;
  }

  header[role="banner"] > a svg {
    width: 130px;
    height: 40px;
  }

  #menu-toggle {
    display: inline-block;
    order: 5;
  }

  nav[aria-label="主导航"] {
    flex: 1 1 100%;
    order: 20;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.45s cubic-bezier(0.22, 0.61, 0.36, 1), opacity 0.3s ease;
    opacity: 0;
  }

  nav[aria-label="主导航"].is-open {
    max-height: 520px;
    opacity: 1;
    padding-top: 8px;
    border-top: 1px solid var(--sakura-border);
  }

  nav[aria-label="主导航"] ul {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  nav[aria-label="主导航"] a {
    display: block;
    padding: 11px 16px;
    font-size: 0.95rem;
    border-radius: var(--sakura-radius-sm);
    background: var(--sakura-surface-solid);
    border: 1px solid var(--sakura-border);
  }

  nav[aria-label="主导航"] a::after {
    display: none;
  }

  form[role="search"] {
    flex: 1 1 100%;
    order: 30;
  }

  #theme-toggle {
    order: 4;
    padding: 8px 12px;
    font-size: 0.8rem;
  }

  #hero {
    padding: 28px 20px;
    border-radius: var(--sakura-radius);
  }

  #hero > div[aria-label="平台数据概览"] ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  #hero > div[aria-label="平台数据概览"] li {
    padding: 12px 10px;
    font-size: 0.82rem;
  }

  #brand,
  #products,
  #solutions,
  #cases,
  #news,
  #articles,
  #faq,
  #howto,
  #contact,
  #sitemap,
  #links {
    padding: 22px 18px;
    border-radius: var(--sakura-radius);
  }

  #faq summary {
    padding: 14px 48px 14px 16px;
    font-size: 0.92rem;
  }

  #faq summary::after {
    right: 14px;
    width: 24px;
    height: 24px;
    font-size: 1rem;
  }

  #howto ol li {
    padding: 12px 14px 12px 52px;
  }

  #howto ol li::before {
    left: 12px;
    width: 28px;
    height: 28px;
    font-size: 0.82rem;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
  }

  #sitemap a,
  #links a {
    padding: 10px 12px;
    font-size: 0.85rem;
  }

  #back-to-top {
    padding: 10px 14px;
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  h2 {
    padding-left: 14px;
  }

  h2::before {
    width: 5px;
  }

  #hero > div[aria-label="平台数据概览"] ul {
    grid-template-columns: 1fr 1fr;
  }

  #sitemap ul,
  #links ul {
    grid-template-columns: 1fr;
  }

  form[role="search"] button {
    padding: 9px 14px;
    font-size: 0.85rem;
  }

  #theme-toggle,
  #menu-toggle {
    padding: 8px 10px;
    font-size: 0.78rem;
  }
}

/* ============ PRINT ============ */
@media print {
  header[role="banner"],
  #back-to-top,
  #theme-toggle,
  #menu-toggle,
  form[role="search"] {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }

  section {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
}