:root {
  --color-bg: #f5f6fa;
  --color-bg-alt: #ffffff;
  --color-surface: #ffffff;
  --color-surface-glass: rgba(255, 255, 255, 0.72);
  --color-border: #e4e6ef;
  --color-text: #1a1a2e;
  --color-text-soft: #4a4d63;
  --color-text-muted: #7a7d94;
  --color-primary: #e94560;
  --color-primary-dark: #c7304a;
  --color-primary-soft: rgba(233, 69, 96, 0.12);
  --color-secondary: #0f3460;
  --color-accent: #16213e;
  --color-link: #0f3460;
  --color-shadow: rgba(26, 26, 46, 0.08);
  --color-shadow-strong: rgba(26, 26, 46, 0.16);
  --gradient-hero: linear-gradient(135deg, #1a1a2e 0%, #16213e 45%, #0f3460 100%);
  --gradient-primary: linear-gradient(135deg, #e94560 0%, #c7304a 100%);
  --gradient-card: linear-gradient(160deg, rgba(255, 255, 255, 0.95) 0%, rgba(245, 246, 250, 0.9) 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.28) 0%, rgba(255, 255, 255, 0.08) 100%);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 30px;
  --radius-pill: 999px;
  --space-xs: 6px;
  --space-sm: 12px;
  --space-md: 20px;
  --space-lg: 32px;
  --space-xl: 52px;
  --space-2xl: 80px;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --transition-fast: 0.18s ease;
  --transition-base: 0.32s cubic-bezier(0.22, 0.61, 0.36, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-height: 72px;
  --max-width: 1200px;
}

[data-theme="dark"] {
  --color-bg: #0d0f1a;
  --color-bg-alt: #12141f;
  --color-surface: #181b2a;
  --color-surface-glass: rgba(24, 27, 42, 0.72);
  --color-border: #262a3d;
  --color-text: #eef0f8;
  --color-text-soft: #c3c6d6;
  --color-text-muted: #8b8fa6;
  --color-primary: #ff5c78;
  --color-primary-dark: #e94560;
  --color-primary-soft: rgba(255, 92, 120, 0.16);
  --color-secondary: #4a7fd4;
  --color-accent: #1f2440;
  --color-link: #7fa8ff;
  --color-shadow: rgba(0, 0, 0, 0.4);
  --color-shadow-strong: rgba(0, 0, 0, 0.6);
  --gradient-hero: linear-gradient(135deg, #0d0f1a 0%, #141a30 45%, #1b2a4a 100%);
  --gradient-primary: linear-gradient(135deg, #ff5c78 0%, #e94560 100%);
  --gradient-card: linear-gradient(160deg, rgba(24, 27, 42, 0.95) 0%, rgba(18, 20, 31, 0.9) 100%);
  --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0d0f1a;
    --color-bg-alt: #12141f;
    --color-surface: #181b2a;
    --color-surface-glass: rgba(24, 27, 42, 0.72);
    --color-border: #262a3d;
    --color-text: #eef0f8;
    --color-text-soft: #c3c6d6;
    --color-text-muted: #8b8fa6;
    --color-primary: #ff5c78;
    --color-primary-dark: #e94560;
    --color-primary-soft: rgba(255, 92, 120, 0.16);
    --color-secondary: #4a7fd4;
    --color-accent: #1f2440;
    --color-link: #7fa8ff;
    --color-shadow: rgba(0, 0, 0, 0.4);
    --color-shadow-strong: rgba(0, 0, 0, 0.6);
    --gradient-hero: linear-gradient(135deg, #0d0f1a 0%, #141a30 45%, #1b2a4a 100%);
    --gradient-primary: linear-gradient(135deg, #ff5c78 0%, #e94560 100%);
    --gradient-card: linear-gradient(160deg, rgba(24, 27, 42, 0.95) 0%, rgba(18, 20, 31, 0.9) 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.08) 0%, rgba(255, 255, 255, 0.02) 100%);
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--color-text);
  background-color: var(--color-bg);
  background-image:
    radial-gradient(circle at 12% 8%, rgba(233, 69, 96, 0.08) 0%, transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(15, 52, 96, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(22, 33, 62, 0.06) 0%, transparent 50%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 12% 8%, rgba(255, 92, 120, 0.1) 0%, transparent 42%),
    radial-gradient(circle at 88% 12%, rgba(74, 127, 212, 0.1) 0%, transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(31, 36, 64, 0.3) 0%, transparent 50%);
}

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

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

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

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

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

h1 { font-size: clamp(1.7rem, 4.2vw, 2.6rem); }
h2 { font-size: clamp(1.4rem, 3.2vw, 2rem); }
h3 { font-size: clamp(1.15rem, 2.4vw, 1.4rem); }
h4 { font-size: clamp(1.05rem, 2vw, 1.2rem); }

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

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
  color: var(--color-text-soft);
}

li {
  margin-bottom: 0.45em;
}

li::marker {
  color: var(--color-primary);
}

blockquote {
  margin: 0 0 1.2em;
  padding: 1.1em 1.4em;
  border-left: 4px solid var(--color-primary);
  background: var(--color-primary-soft);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-soft);
  font-style: normal;
  position: relative;
}

blockquote p {
  margin: 0;
}

blockquote p::before {
  content: "\201C";
  font-size: 2em;
  line-height: 0;
  color: var(--color-primary);
  vertical-align: -0.35em;
  margin-right: 4px;
  opacity: 0.6;
}

time {
  display: inline-block;
  font-size: 0.85em;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.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;
}

/* ===== Header ===== */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background: var(--color-surface-glass);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  backdrop-filter: blur(18px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

#site-header.is-scrolled {
  box-shadow: 0 4px 24px var(--color-shadow);
}

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

.brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.brand a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-weight: 700;
}

.brand a:hover {
  color: var(--color-text);
}

.brand svg {
  border-radius: 10px;
  transition: transform var(--transition-base);
  flex-shrink: 0;
}

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

.brand-name {
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.brand-slogan {
  margin: 0;
  font-size: 0.72rem;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

#main-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
}

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

#main-nav li {
  margin: 0;
}

#main-nav a {
  display: block;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-soft);
  border-radius: var(--radius-pill);
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

#site-search {
  display: flex;
  align-items: center;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

#site-search:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

#search-input {
  border: 0;
  background: transparent;
  padding: 9px 14px;
  font-size: 0.88rem;
  font-family: inherit;
  color: var(--color-text);
  width: 180px;
  outline: none;
  transition: width var(--transition-base);
}

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

#site-search:focus-within #search-input {
  width: 220px;
}

#site-search button {
  border: 0;
  background: var(--gradient-primary);
  color: #fff;
  padding: 9px 18px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

#site-search button:hover {
  opacity: 0.9;
}

#site-search button:active {
  transform: scale(0.97);
}

#theme-toggle,
#menu-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  color: var(--color-text-soft);
  padding: 9px 14px;
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 500;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

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

#menu-toggle {
  display: none;
}

/* ===== Breadcrumb ===== */
#breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-md) 0;
}

#breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

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

#breadcrumb li + li::before {
  content: "/";
  color: var(--color-text-muted);
  opacity: 0.5;
}

#breadcrumb a {
  color: var(--color-text-muted);
}

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

#breadcrumb [aria-current="page"] {
  color: var(--color-text-soft);
  font-weight: 500;
}

/* ===== Main ===== */
#main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md) var(--space-2xl);
}

section {
  margin-bottom: var(--space-2xl);
  scroll-margin-top: calc(var(--header-height) + 20px);
}

section > h2 {
  position: relative;
  padding-bottom: 14px;
  margin-bottom: var(--space-lg);
}

section > h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 64px;
  height: 4px;
  border-radius: var(--radius-pill);
  background: var(--gradient-primary);
}

section > h3 {
  margin-top: var(--space-lg);
  color: var(--color-text);
}

section > h3::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  margin-right: 10px;
  vertical-align: middle;
  box-shadow: 0 0 0 4px var(--color-primary-soft);
}

/* ===== Hero ===== */
#hero {
  position: relative;
  margin-top: var(--space-md);
  padding: var(--space-xl) var(--space-lg);
  border-radius: var(--radius-xl);
  background: var(--gradient-hero);
  color: #fff;
  overflow: hidden;
  box-shadow: 0 24px 60px -20px var(--color-shadow-strong);
}

#hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -15%;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.45) 0%, transparent 68%);
  pointer-events: none;
  animation: heroFloat 14s ease-in-out infinite alternate;
}

#hero::after {
  content: "";
  position: absolute;
  bottom: -50%;
  left: -12%;
  width: 460px;
  height: 460px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(74, 127, 212, 0.4) 0%, transparent 68%);
  pointer-events: none;
  animation: heroFloat 18s ease-in-out infinite alternate-reverse;
}

@keyframes heroFloat {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(-30px, 30px, 0) scale(1.12); }
}

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

#hero-title {
  color: #fff;
  margin-bottom: var(--space-md);
  text-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
}

#hero .hero-lead,
#hero .hero-answer {
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.02rem;
  max-width: 62ch;
}

#hero .hero-answer {
  padding: var(--space-sm) var(--space-md);
  border-left: 3px solid var(--color-primary);
  background: rgba(255, 255, 255, 0.06);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

/* ===== Carousel ===== */
.hero-carousel {
  position: relative;
  margin: var(--space-lg) 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.slide {
  display: none;
  padding: var(--space-md);
  animation: slideFade var(--transition-slow) both;
}

.slide.is-active {
  display: block;
}

@keyframes slideFade {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: translateY(0); }
}

.slide svg {
  width: 100%;
  border-radius: var(--radius-md);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.slide h2 {
  color: #fff;
  margin: var(--space-md) 0 6px;
  font-size: 1.3rem;
}

.slide p {
  color: rgba(255, 255, 255, 0.78);
  margin: 0;
  font-size: 0.95rem;
}

.carousel-controls {
  display: flex;
  gap: 10px;
  padding: 0 var(--space-md) var(--space-md);
  justify-content: center;
}

.carousel-controls button {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: all var(--transition-base);
}

.carousel-controls button:hover,
.carousel-controls button[aria-current="true"] {
  background: var(--gradient-primary);
  border-color: transparent;
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 20px rgba(233, 69, 96, 0.45);
}

/* ===== Hero Stats ===== */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-md);
  list-style: none;
  margin: var(--space-lg) 0 0;
  padding: 0;
}

.hero-stats li {
  margin: 0;
  padding: var(--space-md) var(--space-sm);
  text-align: center;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: transform var(--transition-base), background var(--transition-base);
}

.hero-stats li:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, 0.13);
}

.hero-stats strong {
  display: block;
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 800;
  background: linear-gradient(135deg, #fff 0%, #ffb3c1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.hero-stats span {
  display: block;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.72);
  margin-top: 4px;
}

/* ===== TOC ===== */
#page-toc {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  box-shadow: 0 8px 28px var(--color-shadow);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

#page-toc h2 {
  font-size: 1.15rem;
  margin-bottom: var(--space-md);
}

#page-toc ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px var(--space-md);
  list-style: none;
  padding: 0;
  margin: 0;
}

#page-toc li {
  margin: 0;
}

#page-toc a {
  display: block;
  padding: 9px 14px;
  font-size: 0.9rem;
  color: var(--color-text-soft);
  border-radius: var(--radius-sm);
  border-left: 3px solid transparent;
  transition: all var(--transition-fast);
}

#page-toc a:hover {
  color: var(--color-primary);
  background: var(--color-primary-soft);
  border-left-color: var(--color-primary);
  transform: translateX(4px);
}

/* ===== Cards / Articles ===== */
#articles > article,
#news > h3,
#cases blockquote {
  position: relative;
}

#articles > article {
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-md);
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 18px var(--color-shadow);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  overflow: hidden;
}

#articles > article::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
}

#articles > article:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 42px -12px var(--color-shadow-strong);
  border-color: var(--color-primary);
}

#articles > article:hover::before {
  opacity: 1;
}

#articles > article h3 {
  margin-top: 0;
  color: var(--color-text);
}

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

#articles > article p {
  font-size: 0.95rem;
}

#articles > article a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-primary);
  transition: gap var(--transition-fast);
}

#articles > article a::after {
  content: "\2192";
  transition: transform var(--transition-fast);
}

#articles > article a:hover {
  gap: 10px;
}

#articles > article a:hover::after {
  transform: translateX(3px);
}

/* ===== News ===== */
#news h3 {
  padding: var(--space-md) var(--space-lg);
  margin-top: var(--space-md);
  border-radius: var(--radius-lg);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 18px var(--color-shadow);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#news h3:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px -12px var(--color-shadow-strong);
}

#news h3::before {
  display: none;
}

#news h3 + p {
  margin-top: -0.6em;
  padding: 0 var(--space-lg);
  font-size: 0.9rem;
}

#news > p {
  padding: 0 var(--space-lg);
}

#news a {
  font-weight: 600;
}

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

#cases blockquote:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px -12px var(--color-shadow-strong);
}

/* ===== FAQ ===== */
#faq details {
  margin-bottom: var(--space-sm);
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 12px var(--color-shadow);
  overflow: hidden;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

#faq details[open] {
  border-color: var(--color-primary);
  box-shadow: 0 12px 32px -12px var(--color-shadow-strong);
}

#faq details:hover {
  border-color: var(--color-primary);
}

#faq summary {
  cursor: pointer;
  padding: var(--space-md) var(--space-lg);
  padding-right: 52px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--color-text);
  list-style: none;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast);
}

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

#faq summary::after {
  content: "+";
  position: absolute;
  right: var(--space-lg);
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.5rem;
  font-weight: 400;
  line-height: 1;
  color: var(--color-primary);
  transition: transform var(--transition-base);
}

#faq details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

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

#faq details p {
  padding: 0 var(--space-lg) var(--space-md);
  margin: 0;
  font-size: 0.94rem;
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-md);
  animation: slideFade var(--transition-base) both;
}

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

#howto ol li {
  counter-increment: howto;
  position: relative;
  padding: var(--space-sm) var(--space-md) var(--space-sm) 56px;
  margin-bottom: 10px;
  border-radius: var(--radius-md);
  background: var(--gradient-card);
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

#howto ol li::before {
  content: counter(howto);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: #fff;
  font-size: 0.85rem;
  font-weight: 700;
  box-shadow: 0 4px 12px rgba(233, 69, 96, 0.35);
}

#howto ol li:hover {
  transform: translateX(6px);
  box-shadow: 0 10px 26px -10px var(--color-shadow-strong);
}

/* ===== Contact ===== */
#contact p {
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-border);
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

#contact p:last-of-type {
  border-bottom: 0;
}

#contact a {
  font-weight: 600;
}

/* ===== Sitemap ===== */
#sitemap ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
  list-style: none;
  padding: 0;
}

#sitemap li {
  margin: 0;
}

#sitemap a {
  display: block;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-size: 0.9rem;
  color: var(--color-text-soft);
  transition: all var(--transition-fast);
}

#sitemap a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px -8px var(--color-shadow-strong);
}

/* ===== Footer ===== */
#site-footer {
  margin-top: var(--space-2xl);
  padding: var(--space-xl) var(--space-md) var(--space-md);
  background: var(--gradient-hero);
  color: rgba(255, 255, 255, 0.85);
  position: relative;
  overflow: hidden;
}

#site-footer::before {
  content: "";
  position: absolute;
  top: -60%;
  right: -10%;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(233, 69, 96, 0.22) 0%, transparent 70%);
  pointer-events: none;
}

#site-footer > section {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto var(--space-lg);
  z-index: 1;
}

#site-footer h2 {
  color: #fff;
  font-size: 1.05rem;
  margin-bottom: var(--space-sm);
  padding-bottom: 8px;
  position: relative;
}

#site-footer h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 36px;
  height: 3px;
  border-radius: var(--radius-pill);
  background: var(--gradient-primary);
}

#site-footer p {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
}

#site-footer ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

#site-footer li {
  margin: 0;
}

#site-footer a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.9rem;
  transition: color var(--transition-fast), transform var(--transition-fast);
  display: inline-block;
}

#site-footer a:hover {
  color: #ff8fa3;
  transform: translateX(3px);
}

#site-footer section[id] {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background var(--transition-base);
}

#site-footer section[id]:hover {
  background: rgba(255, 255, 255, 0.08);
}

.footer-bottom {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  text-align: center;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ===== Back to top ===== */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 900;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 0;
  background: var(--gradient-primary);
  color: #fff;
  font-family: inherit;
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: all var(--transition-base);
  box-shadow: 0 10px 28px rgba(233, 69, 96, 0.42);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1.1;
  padding: 4px;
}

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

#back-to-top:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 16px 36px rgba(233, 69, 96, 0.55);
}

/* ===== Scroll animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  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);
  will-change: opacity, transform;
}

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

@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;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ===== Responsive ===== */
@media (max-width: 1080px) {
  #main-nav a {
    padding: 8px 9px;
    font-size: 0.85rem;
  }
  #search-input {
    width: 140px;
  }
  #site-search:focus-within #search-input {
    width: 170px;
  }
}

@media (max-width: 900px) {
  :root {
    --header-height: 64px;
  }
  .header-inner {
    padding: 10px var(--space-md);
  }
  #main-nav {
    order: 3;
    flex-basis: 100%;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 4px;
  }
  #main-nav::-webkit-scrollbar {
    display: none;
  }
  #main-nav ul {
    flex-wrap: nowrap;
  }
  .header-actions {
    margin-left: auto;
  }
  #menu-toggle {
    display: inline-block;
  }
  #main-nav {
    display: none;
  }
  #main-nav.is-open {
    display: flex;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  #page-toc ul {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 680px) {
  body {
    font-size: 15px;
  }
  #main-content {
    padding: 0 var(--space-sm) var(--space-xl);
  }
  #hero {
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-lg);
  }
  #hero .hero-answer {
    padding: var(--space-sm);
  }
  .slide {
    padding: var(--space-sm);
  }
  .slide h2 {
    font-size: 1.1rem;
  }
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }
  .hero-stats li {
    padding: var(--space-sm) var(--space-xs);
  }
  #page-toc {
    padding: var(--space-md);
  }
  #page-toc ul {
    grid-template-columns: 1fr;
  }
  #articles > article {
    padding: var(--space-md);
  }
  #faq summary {
    padding: var(--space-sm) var(--space-md);
    padding-right: 44px;
    font-size: 0.92rem;
  }
  #faq summary::after {
    right: var(--space-md);
  }
  #faq details p {
    padding: 0 var(--space-md) var(--space-md);
    padding-top: var(--space-sm);
  }
  #howto ol li {
    padding: var(--space-sm) var(--space-md) var(--space-sm) 50px;
  }
  #contact p {
    flex-direction: column;
    gap: 2px;
  }
  .header-inner {
    gap: var(--space-sm);
  }
  .brand-slogan {
    display: none;
  }
  #site-search {
    display: none;
  }
  #back-to-top {
    right: 14px;
    bottom: 14px;
    width: 44px;
    height: 44px;
    font-size: 0.68rem;
  }
  #site-footer {
    padding: var(--space-lg) var(--space-md) var(--space-md);
  }
  .footer-bottom {
    font-size: 0.75rem;
  }
}

@media (max-width: 420px) {
  .header-inner {
    padding: 8px var(--space-sm);
  }
  .brand-name {
    font-size: 1.05rem;
  }
  .brand svg {
    width: 32px;
    height: 32px;
  }
  #theme-toggle,
  #menu-toggle {
    padding: 8px 11px;
    font-size: 0.78rem;
  }
  .hero-stats strong {
    font-size: 1.35rem;
  }
  .hero-stats span {
    font-size: 0.72rem;
  }
  .carousel-controls button {
    width: 34px;
    height: 34px;
  }
}

/* ===== Print ===== */
@media print {
  #site-header,
  #back-to-top,
  .carousel-controls,
  #page-toc {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  #hero {
    background: #fff;
    color: #000;
    box-shadow: none;
  }
  #hero-title,
  .slide h2 {
    color: #000;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}