:root {
  --sakura-50: #fff5f8;
  --sakura-100: #ffe4ed;
  --sakura-200: #ffc9db;
  --sakura-300: #ffa8c4;
  --sakura-400: #f77fa5;
  --sakura-500: #e8547c;
  --sakura-600: #cf3a63;
  --sakura-700: #a82a4e;
  --sakura-800: #7d1e3a;
  --sakura-900: #551327;
  --ink-50: #f8f7fa;
  --ink-100: #efeef4;
  --ink-200: #dddbe6;
  --ink-300: #bfbccd;
  --ink-400: #9a96ad;
  --ink-500: #76718a;
  --ink-600: #57526b;
  --ink-700: #3f3b50;
  --ink-800: #2a2738;
  --ink-900: #1a1826;
  --accent-blue: #4a7fc1;
  --accent-purple: #7c6ad4;
  --accent-teal: #2fa89a;
  --bg: #fdf9fb;
  --bg-elevated: rgba(255, 255, 255, 0.72);
  --bg-card: #ffffff;
  --bg-soft: #fff0f5;
  --text: #2a2738;
  --text-soft: #57526b;
  --text-muted: #76718a;
  --border: rgba(232, 84, 124, 0.14);
  --border-soft: rgba(42, 39, 56, 0.08);
  --shadow-sm: 0 2px 8px rgba(168, 42, 78, 0.06);
  --shadow-md: 0 8px 28px rgba(168, 42, 78, 0.1);
  --shadow-lg: 0 18px 48px rgba(168, 42, 78, 0.16);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.7);
  --glass-blur: blur(18px) saturate(160%);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-pill: 999px;
  --header-h: 68px;
  --maxw: 1200px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 0.32s;
  --grad-sakura: linear-gradient(135deg, #ff9dbd 0%, #e8547c 48%, #b83a6a 100%);
  --grad-sunset: linear-gradient(135deg, #ffb3c9 0%, #f77fa5 40%, #7c6ad4 100%);
  --grad-aurora: linear-gradient(120deg, #ffd3e1 0%, #ff9dbd 35%, #a9c7f5 100%);
  --grad-mist: linear-gradient(160deg, #fff0f5 0%, #f3efff 55%, #eaf4ff 100%);
}

html[data-theme="dark"] {
  --bg: #14121c;
  --bg-elevated: rgba(38, 34, 52, 0.66);
  --bg-card: #201d2c;
  --bg-soft: #2a2538;
  --text: #f2eff7;
  --text-soft: #c8c3d6;
  --text-muted: #9d97b0;
  --border: rgba(247, 127, 165, 0.22);
  --border-soft: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 20px 52px rgba(0, 0, 0, 0.6);
  --glass-bg: rgba(32, 29, 44, 0.6);
  --glass-border: rgba(255, 255, 255, 0.1);
  --grad-sakura: linear-gradient(135deg, #b83a6a 0%, #e8547c 50%, #ff9dbd 100%);
  --grad-sunset: linear-gradient(135deg, #7c6ad4 0%, #e8547c 55%, #ffb3c9 100%);
  --grad-aurora: linear-gradient(120deg, #3a2f52 0%, #6b3a5c 45%, #2c3f66 100%);
  --grad-mist: linear-gradient(160deg, #1e1a2b 0%, #241f33 55%, #1a2130 100%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(1100px 520px at 12% -8%, rgba(247, 127, 165, 0.16), transparent 62%),
    radial-gradient(900px 480px at 92% 4%, rgba(124, 106, 212, 0.13), transparent 60%),
    radial-gradient(800px 600px at 50% 110%, rgba(74, 127, 193, 0.1), transparent 65%);
  background-attachment: fixed;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
  overflow-x: hidden;
}

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

a {
  color: var(--sakura-600);
  text-decoration: none;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

a:hover,
a:focus-visible {
  color: var(--sakura-500);
}

html[data-theme="dark"] a {
  color: var(--sakura-300);
}

html[data-theme="dark"] a:hover,
html[data-theme="dark"] a:focus-visible {
  color: var(--sakura-200);
}

:focus-visible {
  outline: 2px solid var(--sakura-400);
  outline-offset: 3px;
  border-radius: 6px;
}

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.6em;
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text);
}

h1 { font-size: clamp(1.6rem, 3.6vw, 2.6rem); }
h2 { font-size: clamp(1.35rem, 2.6vw, 2rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.35rem); }

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

ul, ol {
  margin: 0 0 1.2em;
  padding-left: 1.35em;
  color: var(--text-soft);
}

li {
  margin-bottom: 0.5em;
}

li::marker {
  color: var(--sakura-400);
}

blockquote {
  margin: 0 0 1.2em;
  padding: 1.1em 1.4em;
  border-left: 4px solid var(--sakura-400);
  border-radius: var(--radius-sm);
  background: var(--bg-soft);
  color: var(--text-soft);
  font-style: italic;
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-md);
}

blockquote p {
  margin: 0;
}

time {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

/* ===== Header ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 1px 0 var(--border-soft), var(--shadow-sm);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.header-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--text);
  flex-shrink: 0;
}

.brand svg {
  border-radius: 50%;
  box-shadow: 0 4px 14px rgba(232, 84, 124, 0.38);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.brand:hover svg {
  transform: rotate(-12deg) scale(1.08);
  box-shadow: 0 6px 20px rgba(232, 84, 124, 0.55);
}

.brand-name {
  font-size: 1.18rem;
  letter-spacing: 0.04em;
  background: var(--grad-sakura);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#main-nav {
  flex: 1 1 320px;
  min-width: 0;
}

#main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
}

#main-nav li {
  margin: 0;
}

#main-nav a {
  display: inline-block;
  padding: 7px 11px;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

#main-nav a:hover,
#main-nav a:focus-visible {
  color: var(--sakura-600);
  background: var(--sakura-100);
  transform: translateY(-2px);
}

html[data-theme="dark"] #main-nav a:hover,
html[data-theme="dark"] #main-nav a:focus-visible {
  color: var(--sakura-200);
  background: rgba(247, 127, 165, 0.16);
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  flex-wrap: wrap;
}

.header-tools form {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.header-tools form:focus-within {
  border-color: var(--sakura-400);
  box-shadow: 0 0 0 4px rgba(232, 84, 124, 0.14);
}

#site-search {
  border: 0;
  background: transparent;
  padding: 8px 14px;
  font-size: 0.88rem;
  color: var(--text);
  width: 190px;
  min-width: 0;
  outline: none;
  font-family: inherit;
}

#site-search::placeholder {
  color: var(--text-muted);
}

.header-tools button {
  border: 0;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 15px;
  color: #fff;
  background: var(--grad-sakura);
  transition: filter var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.header-tools form button {
  border-radius: 0;
  height: 100%;
}

.header-tools button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(232, 84, 124, 0.32);
}

.header-tools button:active {
  transform: translateY(0);
}

#theme-toggle,
#menu-toggle {
  border-radius: var(--radius-pill);
  background: var(--bg-card);
  color: var(--text-soft);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 8px 16px;
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--sakura-600);
  border-color: var(--sakura-300);
  background: var(--sakura-50);
  box-shadow: var(--shadow-md);
}

html[data-theme="dark"] #theme-toggle:hover,
html[data-theme="dark"] #menu-toggle:hover {
  color: var(--sakura-200);
  background: rgba(247, 127, 165, 0.14);
}

#menu-toggle {
  display: none;
}

/* ===== Main layout ===== */
main {
  display: block;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 20px 72px;
}

main > section {
  margin-bottom: 40px;
  padding: clamp(22px, 3.4vw, 40px);
  background: var(--bg-elevated);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  scroll-margin-top: calc(var(--header-h) + 16px);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
  animation: rise-in 0.7s var(--ease) both;
  animation-timeline: view();
  animation-range: entry 0% entry 42%;
}

@supports not (animation-timeline: view()) {
  main > section {
    animation: none;
  }
}

main > section:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--border);
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(28px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

main > section > h2 {
  position: relative;
  padding-bottom: 14px;
  margin-bottom: 22px;
}

main > section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--grad-sakura);
  transition: width var(--dur) var(--ease);
}

main > section:hover > h2::after {
  width: 110px;
}

/* ===== Banner ===== */
#banner {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 3.4vw, 40px);
  background: var(--grad-mist);
  border-radius: var(--radius-xl);
}

#banner::before {
  content: "";
  position: absolute;
  inset: -40% -20% auto -20%;
  height: 220%;
  background:
    radial-gradient(closest-side, rgba(255, 157, 189, 0.55), transparent 70%) 12% 20% / 46% 60% no-repeat,
    radial-gradient(closest-side, rgba(124, 106, 212, 0.35), transparent 70%) 88% 12% / 42% 55% no-repeat,
    radial-gradient(closest-side, rgba(74, 127, 193, 0.3), transparent 70%) 62% 92% / 50% 60% no-repeat;
  filter: blur(6px);
  pointer-events: none;
  animation: drift 18s ease-in-out infinite alternate;
}

@keyframes drift {
  from { transform: translate3d(-2%, -1%, 0) scale(1); }
  to { transform: translate3d(2%, 2%, 0) scale(1.06); }
}

.banner-slide {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 16px;
  box-shadow: var(--shadow-md);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.banner-slide:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.banner-slide svg {
  display: block;
  width: 100%;
  height: auto;
}

#banner-title {
  position: relative;
  margin-top: 8px;
  text-align: center;
  background: var(--grad-sunset);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

#banner > p {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
  color: var(--text-soft);
}

/* ===== Content blocks ===== */
#intro h3,
#concept h3,
#products h3,
#solutions h3,
#applications h3,
#cases h3,
#news h3,
#articles h3,
#howto h3,
#knowledge h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 1.6em;
}

#intro h3::before,
#concept h3::before,
#products h3::before,
#solutions h3::before,
#applications h3::before,
#cases h3::before,
#news h3::before,
#articles h3::before,
#howto h3::before,
#knowledge h3::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--grad-sakura);
  box-shadow: 0 0 0 4px rgba(232, 84, 124, 0.14);
  transform: rotate(45deg);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

#intro h3:hover::before,
#concept h3:hover::before,
#products h3:hover::before,
#solutions h3:hover::before,
#applications h3:hover::before,
#cases h3:hover::before,
#news h3:hover::before,
#articles h3:hover::before,
#howto h3:hover::before,
#knowledge h3:hover::before {
  transform: rotate(135deg) scale(1.15);
  box-shadow: 0 0 0 6px rgba(232, 84, 124, 0.18);
}

/* ===== Products list ===== */
#products ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  list-style: none;
  padding: 0;
  margin-top: 1.4em;
}

#products ul li {
  position: relative;
  margin: 0;
  padding: 16px 18px 16px 46px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 0.95rem;
  color: var(--text-soft);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

#products ul li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 50%;
  width: 14px;
  height: 14px;
  margin-top: -7px;
  border-radius: 50%;
  background: var(--grad-sakura);
  box-shadow: 0 0 0 4px rgba(232, 84, 124, 0.12);
  transition: transform var(--dur) var(--ease);
}

#products ul li:hover {
  transform: translateY(-4px);
  border-color: var(--sakura-200);
  box-shadow: var(--shadow-md);
}

#products ul li:hover::before {
  transform: scale(1.3);
}

/* ===== Articles ===== */
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  align-items: start;
}

#articles > h2,
#articles > p {
  grid-column: 1 / -1;
}

#articles article {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

#articles article:hover {
  transform: translateY(-6px);
  border-color: var(--sakura-200);
  box-shadow: var(--shadow-lg);
}

#articles article h3 {
  margin-top: 0;
  margin-bottom: 10px;
  font-size: 1.08rem;
  line-height: 1.5;
}

#articles article h3::before {
  display: none;
}

#articles article p {
  font-size: 0.92rem;
  margin-bottom: 0.9em;
}

#articles article p:has(time) {
  margin-bottom: 0.7em;
}

#articles article a {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  font-size: 0.86rem;
  font-weight: 600;
  color: #fff;
  background: var(--grad-sakura);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 14px rgba(232, 84, 124, 0.28);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), filter var(--dur) var(--ease);
}

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

#articles article a:hover {
  color: #fff;
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(232, 84, 124, 0.4);
}

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

/* ===== Howto ===== */
#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 12px;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  margin: 0;
  padding: 16px 18px 16px 58px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  font-size: 0.95rem;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  font-size: 0.9rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-sunset);
  border-radius: 50%;
  box-shadow: 0 4px 12px rgba(232, 84, 124, 0.3);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

#howto ol li:hover {
  transform: translateX(4px);
  border-color: var(--sakura-200);
  box-shadow: var(--shadow-md);
}

#howto ol li:hover::before {
  transform: translateY(-50%) scale(1.12) rotate(-8deg);
  box-shadow: 0 6px 18px rgba(232, 84, 124, 0.45);
}

/* ===== FAQ ===== */
#faq details {
  margin-bottom: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

#faq details:hover {
  border-color: var(--sakura-200);
  box-shadow: var(--shadow-md);
}

#faq details[open] {
  border-color: var(--sakura-300);
  box-shadow: var(--shadow-md);
}

#faq summary {
  position: relative;
  padding: 16px 52px 16px 20px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--sakura-600);
  background: var(--sakura-100);
  border-radius: 50%;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease), color var(--dur) var(--ease);
}

html[data-theme="dark"] #faq summary::after {
  color: var(--sakura-200);
  background: rgba(247, 127, 165, 0.16);
}

#faq details[open] summary {
  background: var(--bg-soft);
  color: var(--sakura-700);
}

html[data-theme="dark"] #faq details[open] summary {
  color: var(--sakura-200);
}

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

#faq summary:hover {
  background: var(--bg-soft);
}

#faq details p {
  margin: 0;
  padding: 4px 20px 18px;
  font-size: 0.93rem;
  color: var(--text-soft);
  animation: fade-slide 0.4s var(--ease) both;
}

@keyframes fade-slide {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== Contact ===== */
#contact p {
  font-size: 0.95rem;
}

#contact h3 + p {
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  line-height: 2;
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

#contact h3 + p:hover {
  border-color: var(--sakura-200);
  box-shadow: var(--shadow-md);
}

/* ===== Sitemap ===== */
#sitemap ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  padding: 0;
  margin: 0 0 1.4em;
}

#sitemap li {
  margin: 0;
}

#sitemap ul a {
  display: inline-block;
  padding: 8px 16px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

#sitemap ul a:hover {
  transform: translateY(-3px);
  color: #fff;
  background: var(--grad-sakura);
  border-color: transparent;
  box-shadow: 0 8px 20px rgba(232, 84, 124, 0.32);
}

#sitemap h3 {
  margin-top: 1.4em;
}

/* ===== Footer ===== */
#site-footer {
  position: relative;
  background:
    linear-gradient(180deg, transparent, rgba(232, 84, 124, 0.06) 40%, rgba(124, 106, 212, 0.08));
  border-top: 1px solid var(--border-soft);
  padding: 48px 20px 32px;
}

#site-footer > section {
  max-width: var(--maxw);
  margin: 0 auto 26px;
  padding: 22px 24px;
  background: var(--bg-elevated);
  -webkit-backdrop-filter: var(--glass-blur);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

#site-footer > section:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

#site-footer h2 {
  font-size: 1.02rem;
  margin-bottom: 10px;
  color: var(--text);
}

#site-footer p {
  font-size: 0.9rem;
  margin: 0;
  color: var(--text-soft);
}

#site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

#site-footer ul li {
  margin: 0;
}

#site-footer ul a {
  font-size: 0.9rem;
  color: var(--text-soft);
  position: relative;
  transition: color var(--dur) var(--ease);
}

#site-footer ul a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-sakura);
  transition: width var(--dur) var(--ease);
}

#site-footer ul a:hover {
  color: var(--sakura-600);
}

html[data-theme="dark"] #site-footer ul a:hover {
  color: var(--sakura-200);
}

#site-footer ul a:hover::after {
  width: 100%;
}

/* ===== Back to top ===== */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  padding: 12px 18px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--grad-sakura);
  border: 0;
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(232, 84, 124, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.94);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) var(--ease), box-shadow var(--dur) var(--ease), filter var(--dur) var(--ease);
}

#back-to-top.is-visible,
#back-to-top:focus-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#back-to-top:hover {
  filter: brightness(1.08);
  box-shadow: 0 14px 34px rgba(232, 84, 124, 0.55);
  transform: translateY(-3px) scale(1.03);
}

#back-to-top:active {
  transform: translateY(0) scale(0.98);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  #site-search {
    width: 150px;
  }
  #main-nav a {
    padding: 6px 9px;
    font-size: 0.86rem;
  }
}

@media (max-width: 860px) {
  :root {
    --header-h: 60px;
  }

  .header-inner {
    padding: 10px 16px;
    gap: 12px;
    align-items: center;
  }

  #menu-toggle {
    display: inline-block;
    order: 3;
  }

  #main-nav {
    order: 4;
    flex: 1 1 100%;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.42s var(--ease), opacity 0.32s var(--ease), margin var(--dur) var(--ease);
  }

  #main-nav.is-open {
    max-height: 520px;
    opacity: 1;
    margin-top: 4px;
  }

  #main-nav ul {
    flex-direction: column;
    gap: 4px;
    padding: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
  }

  #main-nav a {
    display: block;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.94rem;
  }

  .header-tools {
    order: 2;
    margin-left: auto;
    gap: 6px;
  }

  .header-tools form {
    order: 5;
    flex: 1 1 100%;
    margin-top: 8px;
  }

  #site-search {
    width: 100%;
    flex: 1;
  }

  .header-tools form button {
    border-radius: 0;
  }

  main {
    padding: 22px 14px 56px;
  }

  main > section {
    margin-bottom: 26px;
    padding: 22px 18px;
    border-radius: var(--radius-md);
  }

  #banner {
    border-radius: var(--radius-lg);
    padding: 20px 16px;
  }

  .banner-slide {
    border-radius: var(--radius-md);
  }

  #articles {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  #products ul {
    grid-template-columns: 1fr;
  }

  #back-to-top {
    right: 14px;
    bottom: 14px;
    padding: 10px 15px;
    font-size: 0.8rem;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 15px;
  }

  .brand-name {
    font-size: 1.05rem;
  }

  .brand svg {
    width: 34px;
    height: 34px;
  }

  #theme-toggle,
  #menu-toggle {
    padding: 7px 12px;
    font-size: 0.78rem;
  }

  #banner > p {
    font-size: 0.92rem;
    text-align: left;
  }

  #banner-title {
    font-size: 1.32rem;
    text-align: left;
  }

  #faq summary {
    padding: 14px 46px 14px 16px;
    font-size: 0.92rem;
  }

  #faq details p {
    padding: 2px 16px 16px;
    font-size: 0.88rem;
  }

  #howto ol li {
    padding: 14px 14px 14px 52px;
    font-size: 0.9rem;
  }

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

  #sitemap ul {
    gap: 8px;
  }

  #sitemap ul a {
    padding: 7px 13px;
    font-size: 0.82rem;
  }

  #site-footer {
    padding: 32px 14px 24px;
  }

  #site-footer > section {
    padding: 18px 16px;
  }
}

/* ===== Motion preferences ===== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  main > section {
    animation: none;
    opacity: 1;
    transform: none;
  }
  #banner::before {
    animation: none;
  }
}

/* ===== Print ===== */
@media print {
  #site-header,
  #back-to-top,
  .header-tools,
  #menu-toggle,
  #theme-toggle {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  main > section {
    box-shadow: none;
    border: 1px solid #ddd;
    break-inside: avoid;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}