:root {
  --rose-900: #4a0d24;
  --rose-800: #6d1032;
  --rose-700: #8d1440;
  --rose-600: #b3123c;
  --rose-500: #d01a4a;
  --rose-400: #e8456f;
  --rose-300: #f47b9a;
  --rose-200: #f9b8c9;
  --rose-100: #fde3ea;
  --rose-50: #fef5f7;

  --bg: #fdf7f9;
  --bg-elev: #ffffff;
  --bg-soft: #f9eef2;
  --text: #2a1520;
  --text-soft: #5f4552;
  --text-muted: #8a6f7c;
  --border: #f0dbe2;
  --border-strong: #e3c3ce;

  --glass-bg: rgba(255, 255, 255, 0.62);
  --glass-border: rgba(255, 255, 255, 0.7);
  --glass-shadow: 0 8px 32px rgba(74, 13, 36, 0.1);

  --shadow-sm: 0 2px 8px rgba(74, 13, 36, 0.06);
  --shadow-md: 0 8px 24px rgba(74, 13, 36, 0.09);
  --shadow-lg: 0 18px 48px rgba(74, 13, 36, 0.14);
  --shadow-glow: 0 10px 36px rgba(179, 18, 60, 0.24);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-xl: 32px;
  --radius-pill: 999px;

  --grad-hero: linear-gradient(135deg, #b3123c 0%, #8d1440 42%, #4a0d24 100%);
  --grad-accent: linear-gradient(120deg, #e8456f 0%, #b3123c 55%, #6d1032 100%);
  --grad-soft: linear-gradient(135deg, #fef5f7 0%, #fde3ea 100%);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --container: 1180px;
  --header-h: 72px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

  --transition: 0.32s var(--ease-out);
}

[data-theme="dark"] {
  --bg: #150a10;
  --bg-elev: #1f1018;
  --bg-soft: #271420;
  --text: #f6e8ee;
  --text-soft: #d3b8c3;
  --text-muted: #a68795;
  --border: #3a1f2c;
  --border-strong: #4d2a3a;

  --glass-bg: rgba(31, 16, 24, 0.62);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.55);
  --shadow-glow: 0 10px 36px rgba(232, 69, 111, 0.28);

  --grad-soft: linear-gradient(135deg, #1f1018 0%, #2a1420 100%);
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% -8%, rgba(232, 69, 111, 0.13), transparent 42%),
    radial-gradient(circle at 88% 4%, rgba(179, 18, 60, 0.1), transparent 40%),
    radial-gradient(circle at 50% 110%, rgba(244, 123, 154, 0.1), transparent 46%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  transition: background-color var(--transition), color var(--transition);
}

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

a {
  color: var(--rose-600);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--rose-500);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--rose-400);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-4);
  font-weight: 800;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--text);
}

h1 {
  font-size: clamp(1.85rem, 4.4vw, 3rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  position: relative;
  padding-left: var(--space-4);
}

h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 5px;
  border-radius: var(--radius-pill);
  background: var(--grad-accent);
  box-shadow: 0 0 14px rgba(232, 69, 111, 0.5);
}

h3 {
  font-size: clamp(1.12rem, 2vw, 1.38rem);
  color: var(--rose-700);
}

[data-theme="dark"] h3 {
  color: var(--rose-300);
}

p {
  margin: 0 0 var(--space-4);
  color: var(--text-soft);
}

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

ul, ol {
  margin: 0 0 var(--space-4);
  padding-left: 1.4em;
  color: var(--text-soft);
}

li {
  margin-bottom: var(--space-2);
}

li::marker {
  color: var(--rose-500);
}

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

address {
  font-style: normal;
}

blockquote {
  margin: 0;
  padding: var(--space-5);
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--glass-shadow);
  position: relative;
  overflow: hidden;
}

blockquote::before {
  content: "\201C";
  position: absolute;
  top: -12px;
  left: 14px;
  font-size: 5rem;
  line-height: 1;
  color: var(--rose-300);
  opacity: 0.45;
  font-family: Georgia, serif;
  pointer-events: none;
}

blockquote p {
  position: relative;
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: var(--space-3);
}

blockquote footer {
  font-size: 0.9rem;
  color: var(--text-muted);
}

details {
  margin-bottom: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

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

[data-theme="dark"] details:hover {
  border-color: var(--border-strong);
}

details[open] {
  box-shadow: var(--shadow-md);
}

summary {
  cursor: pointer;
  padding: var(--space-4) var(--space-5);
  font-weight: 700;
  color: var(--text);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  transition: background var(--transition), color var(--transition);
}

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

summary::after {
  content: "+";
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--rose-100);
  color: var(--rose-600);
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  transition: transform var(--transition), background var(--transition), color var(--transition);
}

[data-theme="dark"] summary::after {
  background: rgba(232, 69, 111, 0.18);
  color: var(--rose-300);
}

details[open] summary::after {
  transform: rotate(45deg);
  background: var(--rose-600);
  color: #fff;
}

summary:hover {
  background: var(--rose-50);
  color: var(--rose-700);
}

[data-theme="dark"] summary:hover {
  background: rgba(232, 69, 111, 0.08);
  color: var(--rose-300);
}

details > p {
  padding: 0 var(--space-5) var(--space-4);
  margin: 0;
  animation: fadeSlideDown 0.4s var(--ease-out);
}

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

/* ===== Skip link ===== */
body > a[href="#main-content"] {
  position: absolute;
  left: 50%;
  top: -100px;
  transform: translateX(-50%);
  z-index: 999;
  padding: var(--space-3) var(--space-5);
  background: var(--rose-600);
  color: #fff;
  font-weight: 700;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  box-shadow: var(--shadow-md);
  transition: top var(--transition);
}

body > a[href="#main-content"]:focus {
  top: 0;
  color: #fff;
}

/* ===== Header ===== */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--glass-bg);
  border-bottom: 1px solid var(--glass-border);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  box-shadow: 0 4px 24px rgba(74, 13, 36, 0.06);
  transition: background var(--transition), box-shadow var(--transition);
}

header[role="banner"] > div {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-5);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

header[role="banner"] > div > a[aria-label="玫瑰视频首页"] {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 900;
  font-size: 1.18rem;
  color: var(--text);
  letter-spacing: 0.02em;
  flex: 0 0 auto;
}

header[role="banner"] > div > a[aria-label="玫瑰视频首页"] svg {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: var(--shadow-glow);
  transition: transform 0.5s var(--ease-spring);
}

header[role="banner"] > div > a[aria-label="玫瑰视频首页"]:hover svg {
  transform: rotate(-8deg) scale(1.08);
}

header[role="banner"] > div > a[aria-label="玫瑰视频首页"] span {
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

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

header nav[aria-label="主导航"] ul {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}

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

header nav[aria-label="主导航"] a {
  display: inline-block;
  padding: 8px 12px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  position: relative;
  transition: color var(--transition), background var(--transition);
}

header nav[aria-label="主导航"] a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--grad-accent);
  transform: translateX(-50%);
  transition: width var(--transition);
}

header nav[aria-label="主导航"] a:hover {
  color: var(--rose-600);
  background: var(--rose-50);
}

[data-theme="dark"] header nav[aria-label="主导航"] a:hover {
  color: var(--rose-300);
  background: rgba(232, 69, 111, 0.1);
}

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

header form[role="search"] {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 0 1 300px;
  margin-left: auto;
  position: relative;
}

header 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;
}

header form[role="search"] input {
  flex: 1 1 auto;
  min-width: 0;
  padding: 9px 16px;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

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

header form[role="search"] input:focus {
  outline: none;
  border-color: var(--rose-400);
  box-shadow: 0 0 0 4px rgba(232, 69, 111, 0.16);
}

header form[role="search"] button {
  flex: 0 0 auto;
  padding: 9px 18px;
  font-size: 0.9rem;
  font-weight: 700;
  font-family: inherit;
  color: #fff;
  background: var(--grad-accent);
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}

header form[role="search"] button:hover {
  transform: translateY(-2px);
  filter: brightness(1.06);
  box-shadow: 0 14px 32px rgba(179, 18, 60, 0.34);
}

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

header button[data-theme-toggle] {
  flex: 0 0 auto;
  padding: 9px 16px;
  font-size: 0.88rem;
  font-weight: 700;
  font-family: inherit;
  color: var(--rose-700);
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-pill);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition);
}

[data-theme="dark"] header button[data-theme-toggle] {
  color: var(--rose-300);
}

header button[data-theme-toggle]:hover {
  background: var(--rose-600);
  border-color: var(--rose-600);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ===== Main layout ===== */
main#main-content {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-6) var(--space-5) var(--space-9);
}

main > nav[aria-label="面包屑导航"] {
  margin-bottom: var(--space-5);
}

main > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.86rem;
  color: var(--text-muted);
}

main > nav[aria-label="面包屑导航"] li {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

main > nav[aria-label="面包屑导航"] li:not(:last-child)::after {
  content: "/";
  color: var(--border-strong);
}

main > nav[aria-label="面包屑导航"] a {
  color: var(--text-muted);
  font-weight: 500;
}

main > nav[aria-label="面包屑导航"] a:hover {
  color: var(--rose-600);
}

main > nav[aria-label="面包屑导航"] [aria-current="page"] {
  color: var(--rose-600);
  font-weight: 700;
}

main > section {
  margin-bottom: var(--space-7);
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}

main > section:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--rose-200);
}

[data-theme="dark"] main > section:hover {
  border-color: var(--border-strong);
}

main > section > p:last-child,
main > section > ul:last-child,
main > section > ol:last-child {
  margin-bottom: 0;
}

/* ===== Hero ===== */
#hero {
  position: relative;
  padding: var(--space-8) var(--space-6);
  border-radius: var(--radius-xl);
  background: var(--grad-hero);
  color: #fff;
  border: none;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 18% 20%, rgba(255, 255, 255, 0.22), transparent 42%),
    radial-gradient(circle at 82% 78%, rgba(244, 123, 154, 0.28), transparent 46%);
  z-index: -1;
}

#hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.14), transparent 68%);
  z-index: -1;
  animation: floatOrb 12s ease-in-out infinite;
}

@keyframes floatOrb {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-28px, 28px) scale(1.08); }
}

#hero h1 {
  color: #fff;
  text-shadow: 0 3px 24px rgba(0, 0, 0, 0.28);
  max-width: 22ch;
}

#hero p {
  color: rgba(255, 255, 255, 0.9);
  max-width: 68ch;
  font-size: 1.02rem;
}

#hero > div {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin: var(--space-5) 0 var(--space-6);
}

#hero > div a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 13px 28px;
  font-weight: 700;
  font-size: 0.96rem;
  border-radius: var(--radius-pill);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

#hero > div a:first-child {
  background: #fff;
  color: var(--rose-700);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.22);
}

#hero > div a:first-child:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  color: var(--rose-600);
}

#hero > div a:last-child {
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

#hero > div a:last-child:hover {
  background: rgba(255, 255, 255, 0.24);
  transform: translateY(-3px);
}

#hero figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
  border: 1px solid rgba(255, 255, 255, 0.24);
  transition: transform 0.6s var(--ease-out);
}

#hero figure:hover {
  transform: translateY(-6px) scale(1.01);
}

#hero figure svg {
  display: block;
  width: 100%;
}

#hero figcaption {
  padding: var(--space-3) var(--space-4);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.82);
  background: rgba(0, 0, 0, 0.24);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

/* ===== Stats ===== */
#stats ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4);
}

#stats li {
  margin: 0;
  padding: var(--space-5) var(--space-4);
  text-align: center;
  border-radius: var(--radius-md);
  background: var(--grad-soft);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-soft);
  font-weight: 600;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#stats li:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--rose-300);
}

#stats li strong {
  display: block;
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--space-2);
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-variant-numeric: tabular-nums;
}

/* ===== Advantages / lists as cards ===== */
#advantages ul,
#applications ul,
#solutions > p + p,
#knowledge > h3 + p {
  color: var(--text-soft);
}

#advantages ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

#advantages li {
  margin: 0;
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-left: 4px solid var(--rose-500);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
}

#advantages li:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
  background: var(--rose-50);
}

[data-theme="dark"] #advantages li:hover {
  background: rgba(232, 69, 111, 0.08);
}

/* ===== Solutions ===== */
#solutions h3 {
  margin-top: var(--space-5);
  padding-left: var(--space-4);
  border-left: 3px solid var(--rose-400);
}

#solutions h3:first-of-type {
  margin-top: 0;
}

/* ===== Cases ===== */
#cases h3 {
  margin-top: var(--space-5);
  padding-bottom: var(--space-2);
  border-bottom: 1px dashed var(--border-strong);
}

#cases h3:first-of-type {
  margin-top: 0;
}

/* ===== Testimonials ===== */
#testimonials {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
  background: transparent;
  border: none;
  box-shadow: none;
  padding: 0;
}

#testimonials h2 {
  grid-column: 1 / -1;
}

#testimonials blockquote {
  margin: 0;
}

/* ===== News & Articles ===== */
#news article,
#articles article {
  padding: var(--space-5);
  margin-bottom: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#news article:hover,
#articles article:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--rose-300);
}

#news article h3,
#articles article h3 {
  margin-bottom: var(--space-2);
  font-size: 1.14rem;
}

#news article h3 a,
#articles article h3 a {
  color: var(--text);
  transition: color var(--transition);
}

#news article h3 a:hover,
#articles article h3 a:hover {
  color: var(--rose-600);
}

[data-theme="dark"] #news article h3 a:hover,
[data-theme="dark"] #articles article h3 a:hover {
  color: var(--rose-300);
}

#news article p,
#articles article p {
  margin-bottom: var(--space-3);
  font-size: 0.96rem;
}

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

#articles article > p:last-child a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 7px 18px;
  border-radius: var(--radius-pill);
  background: var(--rose-100);
  color: var(--rose-700);
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

[data-theme="dark"] #articles article > p:last-child a {
  background: rgba(232, 69, 111, 0.16);
  color: var(--rose-300);
}

#articles article > p:last-child a:hover {
  background: var(--rose-600);
  color: #fff;
  transform: translateX(4px);
}

/* ===== FAQ grid ===== */
#faq details {
  margin-bottom: var(--space-3);
}

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

#howto ol > li {
  counter-increment: step;
  position: relative;
  padding: var(--space-4) var(--space-4) var(--space-4) 60px;
  margin-bottom: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  transition: transform var(--transition), box-shadow var(--transition);
}

#howto ol > li::before {
  content: counter(step);
  position: absolute;
  left: var(--space-4);
  top: var(--space-4);
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--grad-accent);
  color: #fff;
  font-weight: 800;
  font-size: 0.92rem;
  box-shadow: var(--shadow-glow);
}

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

#howto ul {
  padding-left: 1.3em;
}

/* ===== Knowledge ===== */
#knowledge h3 {
  margin-top: var(--space-5);
}

#knowledge h3:first-of-type {
  margin-top: 0;
}

/* ===== Contact ===== */
#contact address ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

#contact address li {
  margin: 0;
  padding: var(--space-4) var(--space-4) var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  font-size: 0.94rem;
  position: relative;
  transition: border-color var(--transition), transform var(--transition);
}

#contact address li::before {
  content: "";
  position: absolute;
  left: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 60%;
  border-radius: var(--radius-pill);
  background: var(--grad-accent);
}

#contact address li:hover {
  border-color: var(--rose-300);
  transform: translateY(-2px);
}

/* ===== Sitemap & Links ===== */
#sitemap ul,
#links ul {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

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

#sitemap a,
#links a {
  display: inline-block;
  padding: 7px 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-soft);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: all var(--transition);
}

#sitemap a:hover,
#links a:hover {
  color: #fff;
  background: var(--grad-accent);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* ===== Legal ===== */
#legal h3 {
  margin-top: var(--space-5);
}

#legal h3:first-of-type {
  margin-top: 0;
}

/* ===== Meta info ===== */
#meta-info dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-3);
  margin: 0;
}

#meta-info dt {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  margin-bottom: 2px;
}

#meta-info dd {
  margin: 0 0 var(--space-3);
  font-weight: 600;
  color: var(--text);
}

/* ===== Footer ===== */
footer[role="contentinfo"] {
  background: var(--grad-hero);
  color: rgba(255, 255, 255, 0.82);
  padding: var(--space-7) var(--space-5) var(--space-6);
  position: relative;
  overflow: hidden;
}

footer[role="contentinfo"]::before {
  content: "";
  position: absolute;
  top: -60%;
  left: -10%;
  width: 520px;
  height: 520px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent 68%);
  pointer-events: none;
}

footer[role="contentinfo"] > div {
  max-width: var(--container);
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

footer[role="contentinfo"] p {
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: var(--space-3);
  font-size: 0.9rem;
}

footer[role="contentinfo"] p:first-child {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: var(--space-4);
}

footer[role="contentinfo"] nav[aria-label="页脚导航"] {
  margin: var(--space-5) 0;
}

footer[role="contentinfo"] nav[aria-label="页脚导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3) var(--space-5);
  list-style: none;
  padding: 0;
  margin: 0;
}

footer[role="contentinfo"] nav[aria-label="页脚导航"] li {
  margin: 0;
}

footer[role="contentinfo"] nav[aria-label="页脚导航"] a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9rem;
  font-weight: 600;
  position: relative;
  padding-bottom: 2px;
}

footer[role="contentinfo"] nav[aria-label="页脚导航"] a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--rose-300);
  border-radius: 2px;
  transition: width var(--transition);
}

footer[role="contentinfo"] nav[aria-label="页脚导航"] a:hover {
  color: #fff;
}

footer[role="contentinfo"] nav[aria-label="页脚导航"] a:hover::after {
  width: 100%;
}

footer[role="contentinfo"] p:last-child {
  margin-top: var(--space-5);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.62);
}

/* ===== Back to top ===== */
button[data-back-to-top] {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  z-index: 90;
  width: 52px;
  height: 52px;
  padding: 0;
  font-size: 0.72rem;
  font-weight: 700;
  font-family: inherit;
  color: #fff;
  background: var(--grad-accent);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition), box-shadow var(--transition);
}

button[data-back-to-top].is-visible,
body.is-scrolled button[data-back-to-top] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

button[data-back-to-top]:hover {
  transform: translateY(-4px) scale(1.06);
  box-shadow: 0 16px 40px rgba(179, 18, 60, 0.42);
}

button[data-back-to-top]:active {
  transform: translateY(0) scale(0.98);
}

/* ===== Scroll reveal animation ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  will-change: opacity, transform;
}

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

main > section {
  animation: sectionIn 0.7s var(--ease-out) both;
}

@keyframes sectionIn {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    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;
  }
}

/* ===== Responsive ===== */
@media (max-width: 1080px) {
  header[role="banner"] > div {
    gap: var(--space-3);
  }

  header form[role="search"] {
    flex-basis: 240px;
  }
}

@media (max-width: 900px) {
  :root {
    --header-h: 64px;
  }

  header[role="banner"] > div {
    padding: var(--space-3) var(--space-4);
    row-gap: var(--space-3);
  }

  header nav[aria-label="主导航"] {
    order: 3;
    flex: 1 1 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  header nav[aria-label="主导航"]::-webkit-scrollbar {
    display: none;
  }

  header nav[aria-label="主导航"] ul {
    flex-wrap: nowrap;
    gap: 0;
  }

  header nav[aria-label="主导航"] a {
    white-space: nowrap;
    font-size: 0.86rem;
    padding: 7px 10px;
  }

  header form[role="search"] {
    flex: 1 1 160px;
    margin-left: 0;
  }

  header button[data-theme-toggle] {
    padding: 8px 12px;
    font-size: 0.82rem;
  }

  main#main-content {
    padding: var(--space-5) var(--space-4) var(--space-8);
  }

  main > section {
    padding: var(--space-5);
    border-radius: var(--radius-md);
  }

  #hero {
    padding: var(--space-6) var(--space-5);
    border-radius: var(--radius-lg);
  }

  #hero h1 {
    max-width: none;
  }

  #testimonials {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  body {
    font-size: 15px;
    line-height: 1.72;
  }

  header[role="banner"] > div {
    padding: var(--space-2) var(--space-3);
  }

  header[role="banner"] > div > a[aria-label="玫瑰视频首页"] {
    font-size: 1.02rem;
  }

  header[role="banner"] > div > a[aria-label="玫瑰视频首页"] svg {
    width: 34px;
    height: 34px;
  }

  header form[role="search"] {
    order: 4;
    flex: 1 1 100%;
  }

  header form[role="search"] input {
    padding: 8px 14px;
    font-size: 0.86rem;
  }

  header form[role="search"] button {
    padding: 8px 14px;
    font-size: 0.86rem;
  }

  header button[data-theme-toggle] {
    padding: 7px 10px;
    font-size: 0.78rem;
  }

  main#main-content {
    padding: var(--space-4) var(--space-3) var(--space-7);
  }

  main > section {
    padding: var(--space-4);
    margin-bottom: var(--space-5);
  }

  h2 {
    padding-left: var(--space-3);
  }

  h2::before {
    width: 4px;
  }

  #hero {
    padding: var(--space-5) var(--space-4);
  }

  #hero > div {
    flex-direction: column;
    align-items: stretch;
  }

  #hero > div a {
    justify-content: center;
    padding: 12px 20px;
  }

  #hero figure {
    border-radius: var(--radius-md);
  }

  #hero figcaption {
    font-size: 0.78rem;
    padding: var(--space-2) var(--space-3);
  }

  #stats ul {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
  }

  #stats li {
    padding: var(--space-4) var(--space-2);
    font-size: 0.82rem;
  }

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

  #advantages li {
    padding: var(--space-3) var(--space-4);
  }

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

  #meta-info dl {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }

  summary {
    padding: var(--space-3) var(--space-4);
    font-size: 0.94rem;
  }

  details > p {
    padding: 0 var(--space-4) var(--space-4);
    font-size: 0.92rem;
  }

  #howto ol > li {
    padding: var(--space-3) var(--space-3) var(--space-3) 52px;
  }

  #howto ol > li::before {
    left: var(--space-3);
    top: var(--space-3);
    width: 28px;
    height: 28px;
    font-size: 0.82rem;
  }

  #news article,
  #articles article {
    padding: var(--space-4);
  }

  #sitemap a,
  #links a {
    padding: 6px 12px;
    font-size: 0.82rem;
  }

  footer[role="contentinfo"] {
    padding: var(--space-6) var(--space-4) var(--space-5);
  }

  footer[role="contentinfo"] nav[aria-label="页脚导航"] ul {
    gap: var(--space-2) var(--space-4);
  }

  button[data-back-to-top] {
    right: var(--space-3);
    bottom: var(--space-3);
    width: 46px;
    height: 46px;
    font-size: 0.66rem;
  }
}

@media (max-width: 380px) {
  #stats ul {
    grid-template-columns: 1fr;
  }

  header nav[aria-label="主导航"] a {
    font-size: 0.8rem;
    padding: 6px 8px;
  }
}

/* ===== Print ===== */
@media print {
  header[role="banner"],
  footer[role="contentinfo"],
  button[data-back-to-top],
  body > a[href="#main-content"] {
    display: none !important;
  }

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

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

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

  #hero h1,
  #hero p {
    color: #000;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}