:root {
  --primary: #f26b38;
  --primary-dark: #d94f1e;
  --primary-light: #ff8c5f;
  --accent: #ffd166;
  --accent2: #2a9d8f;
  --accent3: #457b9d;
  --navy: #1d3557;
  --bg: #fdf8f4;
  --bg-alt: #fff;
  --bg-card: rgba(255, 255, 255, 0.72);
  --bg-glass: rgba(255, 255, 255, 0.55);
  --text: #2b2b2b;
  --text-soft: #5c5c5c;
  --text-muted: #8a8a8a;
  --border: rgba(242, 107, 56, 0.16);
  --border-soft: rgba(0, 0, 0, 0.07);
  --shadow-sm: 0 2px 10px rgba(29, 53, 87, 0.06);
  --shadow-md: 0 8px 30px rgba(29, 53, 87, 0.1);
  --shadow-lg: 0 18px 50px rgba(29, 53, 87, 0.16);
  --radius-sm: 10px;
  --radius: 18px;
  --radius-lg: 26px;
  --radius-pill: 999px;
  --grad-hero: linear-gradient(135deg, #f26b38 0%, #ff9a5a 38%, #ffd166 100%);
  --grad-soft: linear-gradient(135deg, rgba(242, 107, 56, 0.1), rgba(255, 209, 102, 0.14));
  --grad-btn: linear-gradient(135deg, #f26b38, #ff8c5f);
  --grad-card: linear-gradient(160deg, rgba(255, 255, 255, 0.9), rgba(255, 248, 243, 0.75));
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --transition: 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-h: 72px;
}

body.dark-mode {
  --primary: #ff8c5f;
  --primary-dark: #f26b38;
  --primary-light: #ffb08c;
  --accent: #ffd166;
  --accent2: #4ecdc4;
  --accent3: #6ba3d6;
  --navy: #e8eef7;
  --bg: #0e1621;
  --bg-alt: #131f2e;
  --bg-card: rgba(24, 36, 52, 0.72);
  --bg-glass: rgba(20, 31, 46, 0.6);
  --text: #e9eef5;
  --text-soft: #b6c2d1;
  --text-muted: #7f8ea3;
  --border: rgba(255, 140, 95, 0.2);
  --border-soft: rgba(255, 255, 255, 0.08);
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.38);
  --shadow-lg: 0 18px 50px rgba(0, 0, 0, 0.5);
  --grad-hero: linear-gradient(135deg, #b8431a 0%, #d9662b 40%, #e8a13a 100%);
  --grad-soft: linear-gradient(135deg, rgba(255, 140, 95, 0.12), rgba(255, 209, 102, 0.08));
  --grad-btn: linear-gradient(135deg, #ff7a45, #ffa06a);
  --grad-card: linear-gradient(160deg, rgba(26, 40, 58, 0.9), rgba(19, 31, 46, 0.8));
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 8% 4%, rgba(242, 107, 56, 0.09), transparent 42%),
    radial-gradient(circle at 92% 12%, rgba(255, 209, 102, 0.12), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(42, 157, 143, 0.08), transparent 55%);
  background-attachment: fixed;
  transition: background-color var(--transition), color var(--transition);
  overflow-x: hidden;
  min-height: 100vh;
}

body.dark-mode {
  background-image:
    radial-gradient(circle at 8% 4%, rgba(255, 140, 95, 0.12), transparent 42%),
    radial-gradient(circle at 92% 12%, rgba(255, 209, 102, 0.07), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(78, 205, 196, 0.08), transparent 55%);
}

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

a {
  color: var(--primary-dark);
  text-decoration: none;
  transition: color var(--transition);
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 2px;
  border-radius: 6px;
}

ul,
ol {
  list-style: none;
}

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

h1 { font-size: clamp(1.7rem, 3.4vw, 2.7rem); }
h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); }
h3 { font-size: clamp(1.12rem, 1.8vw, 1.35rem); }

p {
  color: var(--text-soft);
  margin-bottom: 1rem;
}

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

::selection {
  background: var(--primary);
  color: #fff;
}

.skip-link,
body > a[href="#main-content"] {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 999;
  background: var(--primary);
  color: #fff;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  font-weight: 600;
  box-shadow: var(--shadow-md);
  transition: top var(--transition);
}

body > a[href="#main-content"]:focus {
  top: 16px;
  color: #fff;
}

/* ============ HEADER ============ */
header[role="banner"] {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-glass);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--border-soft);
  transition: background var(--transition), border-color var(--transition);
}

header[role="banner"] > div {
  max-width: 1280px;
  margin: 0 auto;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

header[role="banner"] > div > a[href*="twomall.cn"] {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.18rem;
  color: var(--navy);
  white-space: nowrap;
  transition: transform var(--transition);
}

header[role="banner"] > div > a[href*="twomall.cn"]:hover {
  transform: translateY(-1px) scale(1.02);
  color: var(--primary-dark);
}

header[role="banner"] > div > a[href*="twomall.cn"] svg {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  box-shadow: 0 4px 14px rgba(242, 107, 56, 0.38);
  transition: transform 0.6s var(--transition);
}

header[role="banner"] > div > a[href*="twomall.cn"]:hover svg {
  transform: rotate(90deg);
}

header nav {
  flex: 1 1 auto;
}

header nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 6px;
  align-items: center;
}

header nav ul li a {
  display: inline-block;
  padding: 6px 12px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  position: relative;
  transition: color var(--transition), background var(--transition);
}

header nav ul li a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--grad-btn);
  border-radius: 2px;
  transform: translateX(-50%);
  transition: width var(--transition);
}

header nav ul li a:hover {
  color: var(--primary-dark);
  background: var(--grad-soft);
}

header nav ul li a:hover::after {
  width: 60%;
}

header nav.open {
  display: block;
}

header[role="banner"] > div > div {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

header form[role="search"] {
  display: flex;
  align-items: center;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: 3px 3px 3px 14px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition), border-color var(--transition);
}

header form[role="search"]:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(242, 107, 56, 0.14);
}

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

header form[role="search"] input[type="search"] {
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 0.88rem;
  width: 180px;
  padding: 6px 0;
}

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

header form[role="search"] button[type="submit"] {
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  background: var(--grad-btn);
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  transition: filter var(--transition), transform var(--transition);
}

header form[role="search"] button[type="submit"]:hover {
  filter: brightness(1.08);
  transform: scale(1.04);
}

#theme-toggle,
#menu-toggle {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-soft);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  transition: all var(--transition);
  white-space: nowrap;
}

#theme-toggle:hover,
#menu-toggle:hover {
  color: #fff;
  background: var(--grad-btn);
  border-color: transparent;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

#menu-toggle {
  display: none;
}

/* ============ MAIN LAYOUT ============ */
main {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px 40px;
}

main > section,
main > nav {
  margin-bottom: 28px;
  padding: clamp(22px, 3.4vw, 40px);
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  opacity: 0;
  transform: translateY(28px);
  transition:
    opacity 0.7s ease,
    transform 0.7s cubic-bezier(0.22, 0.61, 0.36, 1),
    box-shadow var(--transition),
    border-color var(--transition);
}

main > section.visible,
main > nav.visible,
main > section#hero,
main > nav[aria-label="面包屑导航"] {
  opacity: 1;
  transform: translateY(0);
}

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

main > section > h2 {
  position: relative;
  padding-left: 20px;
  margin-bottom: 18px;
}

main > section > h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.18em;
  bottom: 0.18em;
  width: 6px;
  border-radius: var(--radius-pill);
  background: var(--grad-btn);
  box-shadow: 0 0 14px rgba(242, 107, 56, 0.4);
}

main > section > h3 {
  margin: 22px 0 10px;
  color: var(--primary-dark);
  position: relative;
  padding-left: 14px;
}

main > section > h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(255, 209, 102, 0.25);
}

main > section ul,
main > section ol {
  margin: 0 0 1rem;
  display: grid;
  gap: 10px;
}

main > section ul li,
main > section ol li {
  color: var(--text-soft);
  padding-left: 24px;
  position: relative;
  transition: color var(--transition), transform var(--transition);
}

main > section ul li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.62em;
  width: 9px;
  height: 9px;
  border-radius: 3px;
  background: var(--grad-btn);
  transform: rotate(45deg);
  transition: transform var(--transition);
}

main > section ul li:hover::before {
  transform: rotate(135deg) scale(1.15);
}

main > section ol {
  counter-reset: step;
}

main > section ol li {
  padding-left: 44px;
  counter-increment: step;
}

main > section ol li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.1em;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  background: var(--grad-btn);
  border-radius: 50%;
  box-shadow: 0 3px 10px rgba(242, 107, 56, 0.35);
}

main > section ul li:hover,
main > section ol li:hover {
  color: var(--text);
}

/* ============ HERO ============ */
#hero {
  position: relative;
  overflow: hidden;
  background: var(--grad-hero);
  border: none;
  padding: clamp(28px, 5vw, 56px);
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
  box-shadow: var(--shadow-lg);
}

#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 255, 255, 0.28), transparent 45%),
    radial-gradient(circle at 10% 90%, rgba(255, 255, 255, 0.16), transparent 40%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  right: -120px;
  top: -120px;
  width: 380px;
  height: 380px;
  border-radius: 50%;
  border: 40px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
  animation: spin 40s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

#hero > div {
  position: relative;
  z-index: 2;
}

#hero h1 {
  color: #fff;
  text-shadow: 0 3px 20px rgba(120, 40, 0, 0.28);
  margin-bottom: 18px;
}

#hero p {
  color: rgba(255, 255, 255, 0.94);
  font-size: clamp(0.92rem, 1.2vw, 1.02rem);
  text-shadow: 0 1px 8px rgba(120, 40, 0, 0.18);
}

#hero > div > div {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 24px;
}

#hero > div > div a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-pill);
  transition: all var(--transition);
}

#hero > div > div a:first-child {
  background: #fff;
  color: var(--primary-dark);
  box-shadow: 0 10px 28px rgba(120, 40, 0, 0.28);
}

#hero > div > div a:first-child:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 36px rgba(120, 40, 0, 0.34);
  color: var(--primary-dark);
}

#hero > div > div a:last-child {
  background: rgba(255, 255, 255, 0.16);
  color: #fff;
  border: 1.5px solid rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

#hero > div > div a:last-child:hover {
  background: rgba(255, 255, 255, 0.28);
  transform: translateY(-3px);
  color: #fff;
}

#hero > div[aria-label="Banner轮播"] {
  position: relative;
  z-index: 2;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(60, 20, 0, 0.34);
  border: 4px solid rgba(255, 255, 255, 0.28);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

#hero > div[aria-label="Banner轮播"] ul {
  display: flex;
  gap: 0;
  animation: slide 15s infinite;
  margin: 0;
}

#hero > div[aria-label="Banner轮播"] ul li {
  min-width: 100%;
  padding: 0;
}

#hero > div[aria-label="Banner轮播"] ul li::before {
  display: none;
}

#hero > div[aria-label="Banner轮播"] ul li svg {
  width: 100%;
  height: auto;
  border-radius: calc(var(--radius) - 6px);
  opacity: 0.6;
  transition: opacity 0.6s ease;
}

#hero > div[aria-label="Banner轮播"] ul li svg.loaded {
  opacity: 1;
}

@keyframes slide {
  0%, 28% { transform: translateX(0); }
  33%, 61% { transform: translateX(-100%); }
  66%, 94% { transform: translateX(-200%); }
  100% { transform: translateX(0); }
}

/* ============ BREADCRUMB ============ */
main > nav[aria-label="面包屑导航"] {
  padding: 14px 22px;
  border-radius: var(--radius);
  margin-bottom: 24px;
}

main > nav[aria-label="面包屑导航"] ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 0.88rem;
}

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

main > nav[aria-label="面包屑导航"] ol li::before {
  display: none;
}

main > nav[aria-label="面包屑导航"] ol li + li::before {
  content: "›";
  display: inline;
  position: static;
  width: auto;
  height: auto;
  background: none;
  color: var(--text-muted);
  margin-right: 8px;
  transform: none;
  border-radius: 0;
}

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

/* ============ STATS ============ */
#stats ul {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin: 0;
}

#stats ul li {
  padding: 26px 18px;
  text-align: center;
  border-radius: var(--radius);
  background: var(--grad-card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#stats ul li::before {
  display: none;
}

#stats ul li::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--grad-soft);
  opacity: 0;
  transition: opacity var(--transition);
  pointer-events: none;
}

#stats ul li:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

#stats ul li:hover::after {
  opacity: 1;
}

#stats ul li strong {
  display: block;
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  font-weight: 800;
  background: var(--grad-btn);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
  position: relative;
  z-index: 1;
}

#stats ul li span {
  display: block;
  margin-top: 6px;
  font-size: 0.88rem;
  color: var(--text-muted);
  position: relative;
  z-index: 1;
}

/* ============ BRAND INTRO ============ */
#brand-intro {
  position: relative;
}

#brand-intro ul li strong {
  color: var(--primary-dark);
}

/* ============ PRODUCTS ============ */
#products {
  position: relative;
}

#products > h3 {
  padding: 14px 18px 14px 34px;
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-top: 18px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#products > h3::before {
  left: 16px;
}

#products > h3:hover {
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
  border-color: var(--primary);
}

#products > h3 + p {
  padding: 0 6px;
}

#products > ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

#products > ul li {
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 16px 16px 40px;
  font-size: 0.94rem;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#products > ul li::before {
  left: 18px;
  top: 1.35em;
}

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

/* ============ SOLUTIONS ============ */
#solutions > h3 {
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-top: 16px;
  transition: transform var(--transition), box-shadow var(--transition);
}

#solutions > h3::before {
  display: none;
}

#solutions > h3:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

#solutions > h3 + p {
  margin-top: 10px;
  padding: 0 6px;
}

/* ============ CASES ============ */
#cases > h3 {
  background: var(--grad-soft);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  margin-top: 18px;
}

#cases > h3::before {
  display: none;
}

#cases > ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 20px;
}

#cases > ul li {
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 20px 20px 26px;
  font-size: 0.94rem;
  font-style: italic;
  color: var(--text-soft);
  position: relative;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

#cases > ul li::before {
  content: "“";
  position: absolute;
  left: 10px;
  top: -6px;
  font-size: 3rem;
  font-weight: 800;
  color: var(--primary);
  opacity: 0.35;
  background: none;
  width: auto;
  height: auto;
  border-radius: 0;
  transform: none;
  line-height: 1;
}

#cases > ul li:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

#cases > ul li:hover::before {
  transform: none;
}

/* ============ NEWS ============ */
#news > ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}

#news > ul > li {
  padding: 22px;
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

#news > ul > li::before {
  display: none;
}

#news > ul > li::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--grad-btn);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--transition);
}

#news > ul > li:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

#news > ul > li:hover::after {
  transform: scaleY(1);
}

#news > ul > li h3 {
  font-size: 1.02rem;
  margin: 0 0 8px;
  color: var(--text);
}

#news > ul > li p {
  margin-bottom: 6px;
  font-size: 0.9rem;
}

#news > ul > li p:first-of-type {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--primary-dark);
  background: var(--grad-soft);
  padding: 2px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 10px;
}

/* ============ ARTICLES ============ */
#articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 18px;
  align-items: start;
}

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

#articles > article {
  padding: 24px;
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

#articles > article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--grad-btn);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

#articles > article:hover {
  transform: translateY(-7px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}

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

#articles > article h3 {
  font-size: 1.06rem;
  margin: 0 0 8px;
  color: var(--text);
  transition: color var(--transition);
}

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

#articles > article p {
  font-size: 0.9rem;
  margin-bottom: 8px;
}

#articles > article p:first-of-type {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

#articles > article a {
  margin-top: auto;
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--primary-dark);
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--grad-soft);
  border: 1px solid var(--border);
  transition: all var(--transition);
}

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

#articles > article a:hover {
  color: #fff;
  background: var(--grad-btn);
  border-color: transparent;
  box-shadow: 0 6px 18px rgba(242, 107, 56, 0.35);
}

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

/* ============ KNOWLEDGE ============ */
#knowledge > h3 {
  margin-top: 20px;
}

#knowledge > h3 + p {
  padding-left: 14px;
  border-left: 2px dashed var(--border);
}

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

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

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

#faq summary {
  cursor: pointer;
  list-style: none;
  padding: 16px 48px 16px 20px;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--text);
  position: relative;
  transition: color var(--transition), background var(--transition);
}

#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: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 400;
  color: var(--primary-dark);
  background: var(--grad-soft);
  border-radius: 50%;
  transition: transform 0.35s ease, background var(--transition), color var(--transition);
}

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

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

#faq details p {
  padding: 0 20px 18px;
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-soft);
  animation: fadeIn 0.4s ease;
}

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

/* ============ HOWTO ============ */
#howto {
  position: relative;
}

#howto ol {
  counter-reset: step;
}

#howto > ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

#howto > ul li {
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px 12px 38px;
  font-size: 0.9rem;
}

#howto > ul li::before {
  left: 16px;
  top: 1.25em;
}

#howto > ol li {
  background: var(--grad-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 14px 16px 14px 52px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#howto > ol li::before {
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
}

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

#howto > ul:last-of-type li::before {
  background: var(--accent2);
}

/* ============ CONTACT ============ */
#contact > ul {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
}

#contact > ul li {
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px 14px 38px;
  font-size: 0.92rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

#contact > ul li::before {
  left: 16px;
  top: 1.3em;
}

#contact > ul li:hover {
  transform: translateY(-3px);
  border-color: var(--primary);
  box-shadow: var(--shadow-sm);
}

#contact > h3 {
  margin-top: 26px;
}

/* ============ SITEMAP & LINKS ============ */
#sitemap ul,
#links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

#sitemap ul li,
#links ul li {
  padding: 0;
}

#sitemap ul li::before,
#links ul li::before {
  display: none;
}

#sitemap ul li a,
#links ul li a {
  display: inline-block;
  padding: 8px 18px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-soft);
  background: var(--grad-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  transition: all var(--transition);
}

#sitemap ul li a:hover,
#links ul li a:hover {
  color: #fff;
  background: var(--grad-btn);
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(242, 107, 56, 0.3);
}

/* ============ FOOTER ============ */
footer[role="contentinfo"] {
  margin-top: 48px;
  background: linear-gradient(180deg, rgba(29, 53, 87, 0.04), rgba(29, 53, 87, 0.09));
  border-top: 1px solid var(--border-soft);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

body.dark-mode footer[role="contentinfo"] {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.18), rgba(0, 0, 0, 0.34));
}

footer[role="contentinfo"] > div {
  max-width: 1280px;
  margin: 0 auto;
  padding: 44px 24px 32px;
}

footer[role="contentinfo"] > div > p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

footer[role="contentinfo"] > div > p:first-child {
  font-weight: 700;
  color: var(--text);
}

footer nav[aria-label="页脚导航"] {
  margin: 18px 0 26px;
}

footer nav[aria-label="页脚导航"] ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

footer nav[aria-label="页脚导航"] ul li a {
  font-size: 0.88rem;
  color: var(--text-soft);
  position: relative;
  transition: color var(--transition);
}

footer nav[aria-label="页脚导航"] ul li a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 2px;
  background: var(--grad-btn);
  border-radius: 2px;
  transition: width var(--transition);
}

footer nav[aria-label="页脚导航"] ul li a:hover {
  color: var(--primary-dark);
}

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

footer section {
  margin-top: 20px;
  padding: 18px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
}

footer section:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

footer section h2 {
  font-size: 0.98rem;
  margin-bottom: 8px;
  color: var(--primary-dark);
}

footer section p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* ============ BACK TO TOP ============ */
#back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  z-index: 90;
  display: none;
  align-items: center;
  justify-content: center;
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  border: none;
  padding: 14px 18px;
  border-radius: var(--radius-pill);
  background: var(--grad-btn);
  box-shadow: 0 10px 28px rgba(242, 107, 56, 0.42);
  transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
  animation: floatIn 0.4s ease;
}

@keyframes floatIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

#back-to-top:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 16px 36px rgba(242, 107, 56, 0.5);
  filter: brightness(1.06);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1080px) {
  header[role="banner"] > div {
    gap: 12px;
  }
  header form[role="search"] input[type="search"] {
    width: 140px;
  }
  #stats ul {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 920px) {
  #hero {
    grid-template-columns: 1fr;
  }
  #hero > div[aria-label="Banner轮播"] {
    order: -1;
    max-width: 560px;
    margin: 0 auto;
    width: 100%;
  }
  #hero > div > div a {
    padding: 11px 22px;
    font-size: 0.9rem;
  }
}

@media (max-width: 820px) {
  :root {
    --header-h: 64px;
    --radius-lg: 20px;
  }

  header[role="banner"] > div {
    padding: 10px 16px;
    flex-wrap: wrap;
  }

  header nav {
    order: 3;
    flex-basis: 100%;
    display: none;
    padding-top: 8px;
    border-top: 1px solid var(--border-soft);
    margin-top: 6px;
  }

  header nav.open {
    display: block;
    animation: fadeIn 0.3s ease;
  }

  header nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  header nav ul li a {
    display: block;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
  }

  header nav ul li a::after {
    display: none;
  }

  header[role="banner"] > div > div {
    flex: 1 1 auto;
    justify-content: flex-end;
    gap: 8px;
  }

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

  header form[role="search"] input[type="search"] {
    width: 100%;
    flex: 1;
  }

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

  #theme-toggle,
  #menu-toggle {
    padding: 7px 12px;
    font-size: 0.8rem;
  }

  main {
    padding: 0 16px 28px;
  }

  main > section,
  main > nav {
    padding: 22px 18px;
    border-radius: var(--radius);
    margin-bottom: 20px;
  }

  #hero {
    padding: 24px 18px;
  }

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

  #stats ul {
    gap: 12px;
  }

  #stats ul li {
    padding: 20px 12px;
  }

  #back-to-top {
    right: 14px;
    bottom: 16px;
    padding: 12px 15px;
    font-size: 0.76rem;
  }

  footer[role="contentinfo"] > div {
    padding: 32px 16px 24px;
  }
}

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

  header[role="banner"] > div > a[href*="twomall.cn"] span {
    font-size: 1rem;
  }

  header[role="banner"] > div > a[href*="twomall.cn"] svg {
    width: 34px;
    height: 34px;
  }

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

  #stats ul li strong {
    font-size: 1.7rem;
  }

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

  #hero > div > div a {
    justify-content: center;
    width: 100%;
  }

  #products > ul,
  #cases > ul,
  #news > ul,
  #contact > ul,
  #howto > ul {
    grid-template-columns: 1fr;
  }

  footer nav[aria-label="页脚导航"] ul {
    gap: 6px 16px;
  }
}

/* ============ ACCESSIBILITY & MOTION ============ */
@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;
  }
  main > section,
  main > nav {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-contrast: more) {
  :root {
    --text-soft: #333;
    --border: rgba(242, 107, 56, 0.5);
  }
  body.dark-mode {
    --text-soft: #e0e0e0;
  }
}

@media print {
  header[role="banner"],
  #back-to-top,
  #hero > div[aria-label="Banner轮播"],
  footer nav[aria-label="页脚导航"] {
    display: none !important;
  }
  body {
    background: #fff;
    color: #000;
  }
  main > section,
  main > nav {
    box-shadow: none;
    border: 1px solid #ccc;
    opacity: 1;
    transform: none;
    page-break-inside: avoid;
  }
  a {
    color: #000;
    text-decoration: underline;
  }
}
</html>