:root {
  --primary: #E8567A;
  --primary-dark: #C93E60;
  --primary-light: #F7B6C8;
  --primary-soft: #FDE8EE;
  --accent: #7FA8D9;
  --accent-soft: #EAF2FB;
  --warm: #F0A8B8;
  --bg: #FFF7FA;
  --bg-alt: #FFFFFF;
  --bg-elevated: rgba(255, 255, 255, 0.72);
  --text: #2C2230;
  --text-soft: #6B5A66;
  --text-muted: #9A8894;
  --border: rgba(232, 86, 122, 0.16);
  --border-soft: rgba(44, 34, 48, 0.08);
  --shadow-sm: 0 2px 8px rgba(232, 86, 122, 0.08);
  --shadow-md: 0 8px 28px rgba(232, 86, 122, 0.12);
  --shadow-lg: 0 18px 48px rgba(232, 86, 122, 0.16);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --glass-bg: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.55);
  --glass-blur: 18px;
  --grad-banner: linear-gradient(135deg, #FDE8EE 0%, #F7D6E2 38%, #EAF2FB 100%);
  --grad-primary: linear-gradient(135deg, #E8567A 0%, #F07A9A 100%);
  --grad-soft: linear-gradient(135deg, #FFF7FA 0%, #FDE8EE 100%);
  --header-h: 68px;
  --maxw: 1200px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
}

html[data-theme="dark"],
body.dark-mode {
  --bg: #17121A;
  --bg-alt: #1F1824;
  --bg-elevated: rgba(31, 24, 36, 0.78);
  --text: #F3EAF0;
  --text-soft: #C9B8C4;
  --text-muted: #9A8894;
  --border: rgba(247, 182, 200, 0.18);
  --border-soft: rgba(255, 255, 255, 0.08);
  --primary-soft: rgba(232, 86, 122, 0.14);
  --accent-soft: rgba(127, 168, 217, 0.14);
  --glass-bg: rgba(31, 24, 36, 0.62);
  --glass-border: rgba(247, 182, 200, 0.16);
  --grad-banner: linear-gradient(135deg, #2A1B26 0%, #3A2130 45%, #1E2436 100%);
  --grad-soft: linear-gradient(135deg, #1F1824 0%, #2A1B26 100%);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]):not([data-theme="dark"]) {
    --bg: #17121A;
    --bg-alt: #1F1824;
    --bg-elevated: rgba(31, 24, 36, 0.78);
    --text: #F3EAF0;
    --text-soft: #C9B8C4;
    --border: rgba(247, 182, 200, 0.18);
    --border-soft: rgba(255, 255, 255, 0.08);
    --primary-soft: rgba(232, 86, 122, 0.14);
    --accent-soft: rgba(127, 168, 217, 0.14);
    --glass-bg: rgba(31, 24, 36, 0.62);
    --glass-border: rgba(247, 182, 200, 0.16);
    --grad-banner: linear-gradient(135deg, #2A1B26 0%, #3A2130 45%, #1E2436 100%);
    --grad-soft: linear-gradient(135deg, #1F1824 0%, #2A1B26 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
  }
}

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

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(247, 182, 200, 0.28), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(127, 168, 217, 0.22), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(232, 86, 122, 0.1), transparent 55%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.25s var(--ease), opacity 0.25s var(--ease);
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

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

h1 {
  font-size: clamp(1.6rem, 3.4vw, 2.5rem);
}

h2 {
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  position: relative;
  padding-left: 18px;
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: 6px;
  background: var(--grad-primary);
  box-shadow: 0 0 12px rgba(232, 86, 122, 0.5);
}

h3 {
  font-size: clamp(1.08rem, 1.8vw, 1.3rem);
  margin-top: 1.6em;
}

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

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

li {
  margin-bottom: 0.45em;
}

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

blockquote {
  margin: 1.2em 0;
  padding: 1em 1.2em;
  border-left: 4px solid var(--primary);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: var(--shadow-sm);
}

blockquote p {
  margin: 0 0 0.4em;
  color: var(--text);
  font-style: italic;
}

blockquote footer {
  font-size: 0.88rem;
  color: var(--text-muted);
  font-style: normal;
}

time {
  color: var(--text-muted);
  font-size: 0.88rem;
}

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

#site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  backdrop-filter: blur(var(--glass-blur)) saturate(160%);
  border-bottom: 1px solid var(--glass-border);
  box-shadow: 0 4px 24px rgba(232, 86, 122, 0.06);
  transition: box-shadow 0.3s var(--ease), background 0.3s var(--ease);
}

#site-header.is-scrolled {
  box-shadow: 0 6px 30px rgba(232, 86, 122, 0.14);
}

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

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  color: var(--text);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
}

.logo:hover {
  color: var(--primary);
}

.logo svg {
  border-radius: 10px;
  box-shadow: 0 4px 14px rgba(232, 86, 122, 0.35);
  transition: transform 0.35s var(--ease);
}

.logo:hover svg {
  transform: rotate(-6deg) scale(1.06);
}

.logo-text {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.main-nav {
  flex: 1;
  min-width: 0;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: nowrap;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.main-nav li {
  margin: 0;
  flex-shrink: 0;
}

.main-nav a {
  display: inline-block;
  padding: 8px 11px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: 999px;
  position: relative;
  white-space: nowrap;
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-primary);
  transform: translateX(-50%);
  transition: width 0.3s var(--ease);
}

.main-nav a:hover,
.main-nav a:focus-visible {
  color: var(--primary);
  background: var(--primary-soft);
}

.main-nav a:hover::after,
.main-nav a:focus-visible::after {
  width: 60%;
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.site-search {
  display: flex;
  align-items: center;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 4px 3px 14px;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
}

.site-search:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(232, 86, 122, 0.14);
}

.site-search input {
  border: none;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 0.86rem;
  width: 150px;
  padding: 6px 4px;
  outline: none;
}

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

.site-search button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: 50%;
  background: var(--grad-primary);
  color: #fff;
  cursor: pointer;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.site-search button:hover {
  transform: scale(1.08);
  box-shadow: 0 4px 14px rgba(232, 86, 122, 0.45);
}

#theme-toggle,
#menu-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--text-soft);
  cursor: pointer;
  transition: color 0.25s var(--ease), background 0.25s var(--ease), transform 0.25s var(--ease), border-color 0.25s var(--ease);
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--primary-soft);
  transform: translateY(-2px);
}

#theme-toggle[aria-pressed="true"] svg {
  transform: rotate(180deg);
}

#theme-toggle svg {
  transition: transform 0.5s var(--ease);
}

#menu-toggle {
  display: none;
}

.mobile-menu {
  border-top: 1px solid var(--border-soft);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  animation: slideDown 0.3s var(--ease);
}

.mobile-menu[hidden] {
  display: none;
}

.mobile-menu ul {
  list-style: none;
  margin: 0;
  padding: 10px 20px 18px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.mobile-menu li {
  margin: 0;
}

.mobile-menu a {
  display: block;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 0.92rem;
  background: var(--bg-elevated);
  border: 1px solid transparent;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.mobile-menu a:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: var(--border);
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px 40px;
}

.breadcrumb {
  padding: 18px 0 6px;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.breadcrumb li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.breadcrumb li + li::before {
  content: "›";
  color: var(--text-muted);
  opacity: 0.6;
}

.breadcrumb a {
  color: var(--text-soft);
}

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

.banner {
  position: relative;
  margin: 18px 0 48px;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--grad-banner);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--glass-border);
  isolation: isolate;
}

.banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 82% 18%, rgba(255, 255, 255, 0.5), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(232, 86, 122, 0.16), transparent 50%);
  pointer-events: none;
  z-index: 1;
}

.slides {
  position: relative;
  min-height: 380px;
}

.slide {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 24px;
  padding: 40px 48px;
  opacity: 0;
  visibility: hidden;
  transform: translateX(30px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease), visibility 0s linear 0.6s;
  z-index: 2;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease), visibility 0s;
  z-index: 3;
}

.slide-art {
  order: 2;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  animation: floatArt 6s ease-in-out infinite;
}

.slide:nth-child(2) .slide-art {
  animation-delay: -2s;
}

.slide:nth-child(3) .slide-art {
  animation-delay: -4s;
}

@keyframes floatArt {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.slide-text {
  order: 1;
  max-width: 480px;
}

.slide-text h2 {
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  padding-left: 0;
  margin-bottom: 0.5em;
  color: var(--text);
  text-shadow: 0 2px 20px rgba(255, 255, 255, 0.5);
}

html[data-theme="dark"] .slide-text h2,
body.dark-mode .slide-text h2 {
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.4);
}

.slide-text h2::before {
  display: none;
}

.slide-text p {
  font-size: clamp(0.92rem, 1.5vw, 1.02rem);
  color: var(--text-soft);
  margin-bottom: 1.4em;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 999px;
  background: var(--grad-primary);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: 0 8px 24px rgba(232, 86, 122, 0.4);
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.btn-primary::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.4) 50%, transparent 70%);
  transform: translateX(-120%);
  transition: transform 0.6s var(--ease);
}

.btn-primary:hover {
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(232, 86, 122, 0.5);
}

.btn-primary:hover::after {
  transform: translateX(120%);
}

.banner-controls {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  z-index: 5;
}

.banner-controls .prev,
.banner-controls .next {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: var(--text);
  font-size: 1.3rem;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.25s var(--ease), transform 0.25s var(--ease), color 0.25s var(--ease);
}

.banner-controls .prev:hover,
.banner-controls .next:hover {
  background: var(--primary);
  color: #fff;
  transform: scale(1.1);
}

.dots {
  display: flex;
  gap: 8px;
  align-items: center;
}

.dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border-radius: 999px;
  border: none;
  background: rgba(232, 86, 122, 0.3);
  cursor: pointer;
  transition: width 0.35s var(--ease), background 0.35s var(--ease);
}

.dot.active {
  width: 28px;
  background: var(--grad-primary);
}

section {
  margin-bottom: 56px;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

#intro {
  margin-top: 8px;
}

#intro h1 {
  margin-bottom: 0.5em;
  background: linear-gradient(120deg, var(--text) 30%, var(--primary) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.lead {
  font-size: clamp(1rem, 1.7vw, 1.1rem);
  color: var(--text-soft);
  line-height: 1.85;
}

.intro-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 28px;
}

.stat {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 22px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
  position: relative;
  overflow: hidden;
}

.stat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-primary);
  opacity: 0;
  transition: opacity 0.35s var(--ease);
}

.stat:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

.stat:hover::before {
  opacity: 1;
}

.stat .num {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

.stat .unit {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary);
  margin-left: 2px;
}

.stat p {
  margin: 6px 0 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.timeline {
  list-style: none;
  padding-left: 0;
  position: relative;
  margin: 1em 0 1.6em;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: 2px;
  opacity: 0.5;
}

.timeline li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 14px;
  color: var(--text-soft);
  transition: transform 0.3s var(--ease), color 0.3s var(--ease);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: 1px;
  top: 8px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--bg-alt);
  border: 3px solid var(--primary);
  box-shadow: 0 0 0 3px rgba(232, 86, 122, 0.14);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.timeline li:hover {
  transform: translateX(4px);
  color: var(--text);
}

.timeline li:hover::before {
  background: var(--primary);
  box-shadow: 0 0 0 5px rgba(232, 86, 122, 0.2);
}

.author-box {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 24px;
  padding: 20px 24px;
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.35s var(--ease), transform 0.35s var(--ease);
}

.author-box:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}

.author-box svg {
  flex-shrink: 0;
  border-radius: 50%;
  box-shadow: 0 4px 16px rgba(232, 86, 122, 0.3);
}

.author-box p {
  margin: 0 0 2px;
  font-size: 0.9rem;
  color: var(--text-soft);
}

.author-box strong {
  color: var(--text);
}

.feature-list {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
  margin: 1.2em 0;
}

.feature-list li {
  position: relative;
  padding: 18px 18px 18px 46px;
  margin: 0;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  color: var(--text-soft);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.feature-list li::before {
  content: "♥";
  position: absolute;
  left: 16px;
  top: 16px;
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: #fff;
  background: var(--grad-primary);
  border-radius: 50%;
  box-shadow: 0 3px 10px rgba(232, 86, 122, 0.4);
}

.feature-list li:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

#scenarios,
#knowledge {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: 32px clamp(20px, 4vw, 40px);
  box-shadow: var(--shadow-sm);
}

.news-list {
  list-style: none;
  padding: 0;
  margin: 1.4em 0 0;
  display: grid;
  gap: 16px;
}

.news-list li {
  margin: 0;
  padding: 20px 22px;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.news-list li:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-md);
  border-left-color: var(--accent);
}

.news-list h3 {
  margin: 6px 0 6px;
  font-size: 1.08rem;
}

.news-list p {
  margin: 0;
  font-size: 0.92rem;
}

.post {
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

.post::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--grad-primary);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.35s var(--ease);
}

.post:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--border);
}

.post:hover::before {
  transform: scaleY(1);
}

.post h3 {
  margin: 0 0 6px;
  font-size: 1.1rem;
  color: var(--text);
}

.post .meta {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.post p {
  font-size: 0.94rem;
  margin-bottom: 12px;
}

.post a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  position: relative;
}

.post a::after {
  content: "→";
  transition: transform 0.25s var(--ease);
}

.post a:hover::after {
  transform: translateX(4px);
}

#faq details {
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  margin-bottom: 12px;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

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

#faq summary {
  list-style: none;
  cursor: pointer;
  padding: 16px 52px 16px 20px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  position: relative;
  transition: background 0.25s var(--ease), color 0.25s var(--ease);
  user-select: none;
}

#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: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--primary-soft);
  color: var(--primary);
  font-size: 1.2rem;
  font-weight: 700;
  line-height: 1;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), color 0.3s var(--ease);
}

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

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

#faq details p {
  padding: 0 20px 18px;
  margin: 0;
  font-size: 0.94rem;
  animation: fadeIn 0.35s var(--ease);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

#howto ol {
  counter-reset: step;
  list-style: none;
  padding: 0;
}

#howto ol li {
  counter-increment: step;
  position: relative;
  padding: 14px 18px 14px 56px;
  margin-bottom: 10px;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

#howto ol li::before {
  content: counter(step);
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--grad-primary);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  box-shadow: 0 4px 12px rgba(232, 86, 122, 0.35);
}

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

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 1.4em;
}

.contact-grid > div {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: 24px 26px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.contact-grid > div:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.contact-grid h3 {
  margin-top: 0;
  color: var(--primary);
}

.contact-grid ul {
  list-style: none;
  padding: 0;
}

.contact-grid li {
  padding: 6px 0;
  border-bottom: 1px dashed var(--border-soft);
  font-size: 0.92rem;
}

.contact-grid li:last-child {
  border-bottom: none;
}

.sitemap-list,
.friend-links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.sitemap-list li,
.friend-links li {
  margin: 0;
}

.sitemap-list a,
.friend-links a {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  color: var(--text-soft);
  font-size: 0.9rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.sitemap-list a:hover,
.friend-links a:hover {
  color: #fff;
  background: var(--grad-primary);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(232, 86, 122, 0.35);
}

#site-footer {
  background: var(--glass-bg);
  -webkit-backdrop-filter: blur(var(--glass-blur));
  backdrop-filter: blur(var(--glass-blur));
  border-top: 1px solid var(--glass-border);
  margin-top: 40px;
  padding: 44px 20px 20px;
  position: relative;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-primary);
}

.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 28px;
}

.footer-inner h2 {
  font-size: 1.2rem;
  padding-left: 0;
  margin-bottom: 0.6em;
}

.footer-inner h2::before {
  display: none;
}

.footer-inner h3 {
  font-size: 1rem;
  margin-top: 0;
  color: var(--text);
  margin-bottom: 0.6em;
}

.footer-inner p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0.6em;
  line-height: 1.7;
}

.footer-inner a {
  color: var(--primary);
}

.copyright {
  max-width: var(--maxw);
  margin: 32px auto 0;
  padding-top: 20px;
  border-top: 1px solid var(--border-soft);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
}

#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--grad-primary);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(232, 86, 122, 0.45);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  z-index: 90;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), opacity 0.3s var(--ease);
  animation: popIn 0.3s var(--ease);
}

#back-to-top[hidden] {
  display: none;
}

#back-to-top:hover {
  transform: translateY(-5px) scale(1.06);
  box-shadow: 0 14px 32px rgba(232, 86, 122, 0.55);
}

@keyframes popIn {
  from { opacity: 0; transform: scale(0.6); }
  to { opacity: 1; transform: scale(1); }
}

.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

.reveal-zoom {
  opacity: 0;
  transform: scale(0.94);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

.reveal-zoom.is-visible {
  opacity: 1;
  transform: scale(1);
}

@media (max-width: 1080px) {
  .main-nav a {
    padding: 8px 8px;
    font-size: 0.85rem;
  }
  .site-search input {
    width: 120px;
  }
}

@media (max-width: 920px) {
  .main-nav {
    display: none;
  }
  #menu-toggle {
    display: inline-flex;
  }
  .site-search input {
    width: 140px;
  }
  .slide {
    grid-template-columns: 1fr;
    padding: 32px 28px 64px;
    text-align: center;
    gap: 16px;
  }
  .slide-art {
    order: 1;
    max-width: 380px;
    margin: 0 auto;
  }
  .slide-text {
    order: 2;
    max-width: 100%;
    margin: 0 auto;
  }
  .slide-text h2 {
    font-size: 1.4rem;
  }
  .slides {
    min-height: 520px;
  }
  .intro-stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  :root {
    --header-h: 60px;
  }
  .header-inner {
    padding: 0 14px;
    gap: 10px;
  }
  .logo-text {
    font-size: 1rem;
  }
  .site-search {
    display: none;
  }
  main {
    padding: 0 14px 30px;
  }
  .banner {
    border-radius: var(--radius-lg);
    margin-bottom: 36px;
  }
  .slides {
    min-height: 500px;
  }
  .slide {
    padding: 24px 18px 60px;
  }
  .slide-art {
    max-width: 300px;
  }
  .slide-text h2 {
    font-size: 1.2rem;
  }
  .slide-text p {
    font-size: 0.88rem;
  }
  .btn-primary {
    padding: 10px 22px;
    font-size: 0.88rem;
  }
  .banner-controls {
    bottom: 12px;
    gap: 10px;
  }
  .banner-controls .prev,
  .banner-controls .next {
    width: 32px;
    height: 32px;
    font-size: 1.1rem;
  }
  .intro-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .stat {
    padding: 16px 10px;
    border-radius: var(--radius-md);
  }
  .stat p {
    font-size: 0.76rem;
  }
  section {
    margin-bottom: 40px;
  }
  h2 {
    font-size: 1.25rem;
    padding-left: 14px;
  }
  h2::before {
    width: 4px;
  }
  #scenarios,
  #knowledge {
    padding: 22px 16px;
    border-radius: var(--radius-lg);
  }
  .author-box {
    flex-direction: column;
    text-align: center;
    padding: 18px;
  }
  .feature-list {
    grid-template-columns: 1fr;
  }
  .post {
    padding: 18px;
  }
  #faq summary {
    padding: 14px 48px 14px 16px;
    font-size: 0.92rem;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid > div {
    padding: 20px;
  }
  .mobile-menu ul {
    grid-template-columns: 1fr;
  }
  #back-to-top {
    right: 14px;
    bottom: 18px;
    width: 42px;
    height: 42px;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 22px;
  }
}

@media (max-width: 380px) {
  .slide-text h2 {
    font-size: 1.08rem;
  }
  .intro-stats {
    grid-template-columns: 1fr;
  }
}

@media (hover: none) {
  .slide-art {
    animation: none;
  }
  .stat:hover,
  .feature-list li:hover,
  .post:hover,
  .news-list li:hover,
  .author-box:hover,
  .contact-grid > div:hover {
    transform: none;
  }
}

@media print {
  #site-header,
  .banner-controls,
  #back-to-top,
  .site-search,
  .mobile-menu,
  #theme-toggle,
  #menu-toggle {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  .banner {
    box-shadow: none;
    border: 1px solid #ccc;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}