/* =============================================
   片多多 修车改装视频社区 - 主样式文件
   配色：碳纤维黑 #0D0D0D + 橙色 #FF6B00 + 金属银 #C0C0C0
   域名：Lvqfuh.cn
   ============================================= */

/* ---- 基础重置 ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', Arial, sans-serif;
  background: #0D0D0D;
  color: #E8E8E8;
  line-height: 1.7;
  overflow-x: hidden;
}
a { color: #FF6B00; text-decoration: none; transition: color .25s; }
a:hover { color: #FFB347; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; outline: none; }

/* ---- CSS变量 ---- */
:root {
  --orange: #FF6B00;
  --orange-light: #FFB347;
  --orange-dark: #CC5500;
  --black: #0D0D0D;
  --dark: #141414;
  --dark2: #1A1A1A;
  --dark3: #222222;
  --silver: #C0C0C0;
  --silver-light: #E8E8E8;
  --white: #FFFFFF;
  --carbon: repeating-linear-gradient(
    45deg,
    #1a1a1a 0px, #1a1a1a 2px,
    #111 2px, #111 4px
  );
  --gradient-orange: linear-gradient(135deg, #FF6B00 0%, #FF9500 100%);
  --gradient-dark: linear-gradient(180deg, #141414 0%, #0D0D0D 100%);
  --shadow-orange: 0 4px 20px rgba(255,107,0,.35);
  --shadow-card: 0 8px 32px rgba(0,0,0,.6);
  --radius: 8px;
  --radius-lg: 16px;
  --transition: .3s cubic-bezier(.4,0,.2,1);
}

/* ---- 滚动条 ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: #1a1a1a; }
::-webkit-scrollbar-thumb { background: #FF6B00; border-radius: 3px; }

/* ============================================================
   顶部公告栏
   ============================================================ */
.4qndr {
  background: var(--gradient-orange);
  color: #fff;
  text-align: center;
  padding: 8px 20px;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .5px;
  position: relative;
  z-index: 100;
}
.notice-strip a { color: #fff; text-decoration: underline; }

/* ============================================================
   导航栏
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(13,13,13,.97);
  border-bottom: 2px solid #FF6B00;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  gap: 20px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.site-logo img {
  width: 48px;
  height: 48px;
  border-radius: 8px;
  object-fit: cover;
  border: 2px solid #FF6B00;
}
.site-logo .logo-text {
  font-size: 1.5rem;
  font-weight: 900;
  color: #FF6B00;
  letter-spacing: 1px;
  text-shadow: 0 0 12px rgba(255,107,0,.5);
}
.site-logo .logo-sub {
  font-size: .7rem;
  color: #C0C0C0;
  display: block;
  line-height: 1.2;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.main-nav a {
  color: #C0C0C0;
  font-size: .9rem;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 6px;
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
  color: #FF6B00;
  background: rgba(255,107,0,.12);
}
.nav-cta {
  background: var(--gradient-orange) !important;
  color: #fff !important;
  border-radius: 6px !important;
  padding: 8px 18px !important;
  box-shadow: var(--shadow-orange);
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(255,107,0,.5) !important; }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 8px;
}
.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: #FF6B00;
  border-radius: 2px;
  transition: all .3s;
}
.mobile-nav {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(13,13,13,.98);
  z-index: 9999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
  color: #E8E8E8;
  font-size: 1.4rem;
  font-weight: 700;
  padding: 12px 40px;
  border-radius: 8px;
  transition: all .25s;
}
.mobile-nav a:hover { color: #FF6B00; background: rgba(255,107,0,.1); }
.mobile-nav-close {
  position: absolute;
  top: 20px; right: 24px;
  background: none;
  color: #FF6B00;
  font-size: 2rem;
  font-weight: 300;
}

/* ---- 搜索框 ---- */
.search-bar-wrap {
  background: #141414;
  border-bottom: 1px solid #222;
  padding: 10px 20px;
}
.search-bar-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
}
.search-bar-inner form {
  display: flex;
  flex: 1;
  max-width: 600px;
  border: 1.5px solid #333;
  border-radius: 24px;
  overflow: hidden;
  transition: border-color .25s;
}
.search-bar-inner form:focus-within { border-color: #FF6B00; }
.search-bar-inner input {
  flex: 1;
  background: #1a1a1a;
  border: none;
  color: #E8E8E8;
  padding: 9px 18px;
  font-size: .9rem;
  outline: none;
}
.search-bar-inner input::placeholder { color: #555; }
.search-bar-inner button[type="submit"] {
  background: var(--gradient-orange);
  color: #fff;
  padding: 9px 20px;
  font-size: .9rem;
  font-weight: 600;
  border-radius: 0 22px 22px 0;
  transition: opacity .2s;
}
.search-bar-inner button[type="submit"]:hover { opacity: .85; }
.search-hot-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.search-hot-tags span { color: #666; font-size: .8rem; }
.search-hot-tags a {
  font-size: .8rem;
  color: #888;
  background: #222;
  padding: 3px 10px;
  border-radius: 12px;
  transition: all .2s;
}
.search-hot-tags a:hover { color: #FF6B00; background: rgba(255,107,0,.1); }

/* ============================================================
   Banner 区域
   ============================================================ */
.hero-banner {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #0D0D0D;
}
.hero-banner .banner-bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/banner.jpg');
  background-size: cover;
  background-position: center;
  filter: brightness(.45);
  transform: scale(1.03);
  transition: transform 8s ease;
}
.hero-banner:hover .banner-bg { transform: scale(1.0); }
.hero-banner .rtlk0r {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(13,13,13,.9) 0%, rgba(13,13,13,.3) 60%, transparent 100%);
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1280px;
  margin: 0 auto;
  padding: 80px 20px;
  width: 100%;
}
.bw38zn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,107,0,.15);
  border: 1px solid rgba(255,107,0,.4);
  color: #FF6B00;
  font-size: .8rem;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: 20px;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.bw38zn::before { content: '▶'; font-size: .7rem; }
.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  color: #fff;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0,0,0,.8);
}
.hero-title .brand-hl { color: #FF6B00; }
.hero-desc {
  font-size: 1.05rem;
  color: #C0C0C0;
  max-width: 560px;
  margin-bottom: 28px;
  line-height: 1.8;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--gradient-orange);
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  padding: 13px 28px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-orange);
  transition: all var(--transition);
  border: none;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,107,0,.5); color: #fff; }
.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: var(--radius);
  border: 2px solid rgba(255,255,255,.3);
  transition: all var(--transition);
}
.btn-outline:hover { border-color: #FF6B00; color: #FF6B00; background: rgba(255,107,0,.08); }
.hero-stats {
  display: flex;
  gap: 32px;
  margin-top: 36px;
  flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat .num { font-size: 1.8rem; font-weight: 900; color: #FF6B00; line-height: 1; }
.hero-stat .label { font-size: .8rem; color: #888; margin-top: 4px; }

/* ============================================================
   通用区块样式
   ============================================================ */
.section { padding: 70px 20px; }
.section-alt { background: #141414; }
.section-carbon { background: var(--carbon); }
.container { max-width: 1280px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 48px; }
.ajd166dw {
  display: inline-block;
  background: rgba(255,107,0,.12);
  color: #FF6B00;
  font-size: .78rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 20px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 12px;
  border: 1px solid rgba(255,107,0,.25);
}
.section-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 900;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 12px;
}
.section-title .hl { color: #FF6B00; }
.section-desc { color: #888; font-size: 1rem; max-width: 560px; margin: 0 auto; }
.section-more {
  text-align: center;
  margin-top: 40px;
}

/* ============================================================
   视频卡片
   ============================================================ */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.video-card {
  background: #1A1A1A;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid #2a2a2a;
  transition: all var(--transition);
  cursor: pointer;
  position: relative;
}
.video-card:hover {
  transform: translateY(-6px);
  border-color: #FF6B00;
  box-shadow: 0 12px 40px rgba(255,107,0,.25);
}
.video-thumb {
  position: relative;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: #111;
}
.video-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .5s ease;
}
.video-card:hover .video-thumb img { transform: scale(1.08); }
.i72k5zue {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.45);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.video-card:hover .i72k5zue { opacity: 1; }
.v8thnt {
  width: 60px;
  height: 60px;
  background: rgba(255,107,0,.9);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(.8);
  transition: transform .3s;
  box-shadow: 0 0 30px rgba(255,107,0,.6);
}
.video-card:hover .v8thnt { transform: scale(1); }
.v8thnt::after {
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 10px 0 10px 18px;
  border-color: transparent transparent transparent #fff;
  margin-left: 4px;
}
.video-duration {
  position: absolute;
  bottom: 8px;
  right: 8px;
  background: rgba(0,0,0,.8);
  color: #fff;
  font-size: .75rem;
  padding: 2px 7px;
  border-radius: 4px;
  font-weight: 600;
}
.video-quality {
  position: absolute;
  top: 8px;
  left: 8px;
  background: #FF6B00;
  color: #fff;
  font-size: .7rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: .5px;
}
.video-info {
  padding: 14px 16px;
}
.video-title {
  font-size: .95rem;
  font-weight: 700;
  color: #E8E8E8;
  line-height: 1.4;
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.video-card:hover .video-title { color: #FF6B00; }
.video-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: .8rem;
  color: #666;
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.q9mcz {
  font-size: .72rem;
  background: rgba(255,107,0,.1);
  color: #FF6B00;
  padding: 2px 8px;
  border-radius: 10px;
  border: 1px solid rgba(255,107,0,.2);
}

/* ---- 视频模态框 ---- */
.vid-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.92);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.vid-modal.active { display: flex; }
.vid-modal-inner {
  background: #1a1a1a;
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: 100%;
  max-width: 900px;
  border: 1px solid #333;
  box-shadow: 0 20px 80px rgba(0,0,0,.8);
  position: relative;
}
.vid-modal-close {
  position: absolute;
  top: 12px; right: 16px;
  background: rgba(255,107,0,.8);
  color: #fff;
  width: 32px; height: 32px;
  border-radius: 50%;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: background .2s;
}
.vid-modal-close:hover { background: #FF6B00; }
.vid-modal-body video {
  width: 100%;
  aspect-ratio: 16/9;
  background: #000;
  display: block;
}
.vid-modal-info { padding: 16px 20px; }
.vid-modal-info h3 { font-size: 1.1rem; color: #fff; margin-bottom: 6px; }
.vid-modal-info p { font-size: .85rem; color: #888; }

/* ============================================================
   分类标签筛选
   ============================================================ */
.qwlx0z {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}
.qwa6gal {
  background: #1a1a1a;
  color: #888;
  border: 1px solid #2a2a2a;
  padding: 7px 18px;
  border-radius: 20px;
  font-size: .88rem;
  font-weight: 600;
  transition: all .2s;
  cursor: pointer;
}
.qwa6gal:hover,
.filter-tab.active {
  background: rgba(255,107,0,.15);
  color: #FF6B00;
  border-color: #FF6B00;
}

/* ============================================================
   服务模块
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.service-card {
  background: #1A1A1A;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}
.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--gradient-orange);
  transform: scaleX(0);
  transition: transform .3s;
}
.service-card:hover { border-color: #FF6B00; transform: translateY(-4px); box-shadow: var(--shadow-card); }
.service-card:hover::before { transform: scaleX(1); }
.service-icon {
  width: 60px;
  height: 60px;
  background: rgba(255,107,0,.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.6rem;
  border: 2px solid rgba(255,107,0,.25);
  transition: all .3s;
}
.service-card:hover .service-icon { background: rgba(255,107,0,.2); border-color: #FF6B00; }
.service-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: #E8E8E8;
  margin-bottom: 8px;
}
.service-desc { font-size: .85rem; color: #777; line-height: 1.6; }

/* ============================================================
   专家展示
   ============================================================ */
.experts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
}
.ne0kst8i {
  background: #1A1A1A;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  text-align: center;
}
.ne0kst8i:hover { border-color: #FF6B00; transform: translateY(-4px); box-shadow: var(--shadow-card); }
.expert-photo {
  width: 100%;
  aspect-ratio: 1/1;
  object-fit: cover;
  filter: grayscale(20%);
  transition: filter .3s;
}
.ne0kst8i:hover .expert-photo { filter: grayscale(0%); }
.expert-info { padding: 20px; }
.expert-name { font-size: 1.1rem; font-weight: 800; color: #fff; margin-bottom: 4px; }
.expert-role { font-size: .82rem; color: #FF6B00; font-weight: 600; margin-bottom: 10px; }
.expert-bio { font-size: .83rem; color: #777; line-height: 1.6; margin-bottom: 14px; }
.expert-actions { display: flex; gap: 10px; justify-content: center; }
.expert-btn {
  font-size: .8rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 6px;
  transition: all .2s;
}
.expert-btn-primary { background: #FF6B00; color: #fff; }
.expert-btn-primary:hover { background: #CC5500; color: #fff; }
.expert-btn-outline { border: 1px solid #444; color: #aaa; }
.expert-btn-outline:hover { border-color: #FF6B00; color: #FF6B00; }

/* ============================================================
   AI赋能区块
   ============================================================ */
.ai-features {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.ai-card {
  background: linear-gradient(135deg, #1a1a1a 0%, #141414 100%);
  border: 1px solid #2a2a2a;
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}
.ai-card::after {
  content: '';
  position: absolute;
  bottom: -40px; right: -40px;
  width: 120px; height: 120px;
  background: radial-gradient(circle, rgba(255,107,0,.15) 0%, transparent 70%);
  border-radius: 50%;
  transition: all .4s;
}
.ai-card:hover { border-color: rgba(255,107,0,.5); box-shadow: 0 8px 32px rgba(255,107,0,.15); }
.ai-card:hover::after { bottom: -20px; right: -20px; width: 160px; height: 160px; }
.ai-icon { font-size: 2.2rem; margin-bottom: 14px; }
.ai-title { font-size: 1.1rem; font-weight: 800; color: #fff; margin-bottom: 8px; }
.ai-desc { font-size: .87rem; color: #777; line-height: 1.7; }
.sp05iii {
  display: inline-block;
  background: rgba(255,107,0,.12);
  color: #FF6B00;
  font-size: .72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 10px;
  margin-top: 12px;
  border: 1px solid rgba(255,107,0,.2);
}

/* ============================================================
   合作品牌 Logo 墙
   ============================================================ */
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: center;
  align-items: center;
}
.partner-item {
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius);
  padding: 16px 28px;
  font-size: .9rem;
  font-weight: 700;
  color: #888;
  transition: all .25s;
  text-align: center;
  min-width: 120px;
}
.partner-item:hover { border-color: #FF6B00; color: #FF6B00; background: rgba(255,107,0,.06); }

/* ============================================================
   FAQ 区块
   ============================================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.mpb77dy {
  background: #1A1A1A;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color .25s;
}
.faq-item.open { border-color: rgba(255,107,0,.4); }
.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  cursor: pointer;
  font-size: .97rem;
  font-weight: 700;
  color: #E8E8E8;
  transition: color .2s;
  gap: 12px;
}
.faq-question:hover { color: #FF6B00; }
.faq-item.open .faq-question { color: #FF6B00; }
.faq-icon {
  width: 24px; height: 24px;
  background: rgba(255,107,0,.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .8rem;
  flex-shrink: 0;
  transition: all .3s;
  color: #FF6B00;
}
.faq-item.open .faq-icon { background: #FF6B00; color: #fff; transform: rotate(45deg); }
.faq-answer {
  display: none;
  padding: 0 22px 18px;
  font-size: .9rem;
  color: #888;
  line-height: 1.8;
}
.faq-item.open .faq-answer { display: block; }

/* ============================================================
   用户评价
   ============================================================ */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}
.xog09c9w {
  background: #1A1A1A;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius-lg);
  padding: 22px;
  transition: all var(--transition);
  position: relative;
}
.xog09c9w:hover { border-color: rgba(255,107,0,.3); box-shadow: var(--shadow-card); }
.xog09c9w::before {
  content: '"';
  position: absolute;
  top: 12px; right: 18px;
  font-size: 4rem;
  color: rgba(255,107,0,.1);
  font-family: Georgia, serif;
  line-height: 1;
}
.review-stars { color: #FF6B00; font-size: 1rem; margin-bottom: 10px; letter-spacing: 2px; }
.review-text { font-size: .9rem; color: #aaa; line-height: 1.7; margin-bottom: 16px; }
.review-author { display: flex; align-items: center; gap: 10px; }
.review-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--gradient-orange);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .9rem;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}
.review-name { font-size: .88rem; font-weight: 700; color: #E8E8E8; }
.review-date { font-size: .75rem; color: #555; }

/* ============================================================
   How-To 加入社区
   ============================================================ */
.howto-steps {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.howto-step {
  background: #1A1A1A;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius-lg);
  padding: 28px 22px;
  text-align: center;
  position: relative;
  transition: all var(--transition);
}
.howto-step:hover { border-color: #FF6B00; transform: translateY(-4px); }
.step-num {
  width: 48px; height: 48px;
  background: var(--gradient-orange);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 900;
  color: #fff;
  margin: 0 auto 16px;
  box-shadow: var(--shadow-orange);
}
.step-title { font-size: 1rem; font-weight: 800; color: #fff; margin-bottom: 8px; }
.step-desc { font-size: .85rem; color: #777; line-height: 1.6; }

/* ============================================================
   联系我们 / 社区入口
   ============================================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info-card {
  background: #1A1A1A;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius-lg);
  padding: 32px;
}
.contact-info-card h3 { font-size: 1.2rem; font-weight: 800; color: #fff; margin-bottom: 20px; }
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
  padding-bottom: 18px;
  border-bottom: 1px solid #222;
}
.contact-item:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.contact-icon {
  width: 40px; height: 40px;
  background: rgba(255,107,0,.12);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  border: 1px solid rgba(255,107,0,.2);
}
.contact-label { font-size: .8rem; color: #666; margin-bottom: 2px; }
.contact-value { font-size: .92rem; color: #E8E8E8; font-weight: 600; }
.qr-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.qr-card {
  background: #1A1A1A;
  border: 1px solid #2a2a2a;
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: all .25s;
}
.qr-card:hover { border-color: #FF6B00; }
.qr-placeholder {
  width: 120px; height: 120px;
  background: #fff;
  border-radius: 8px;
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .7rem;
  color: #333;
  text-align: center;
  padding: 8px;
  line-height: 1.4;
}
.qr-label { font-size: .85rem; font-weight: 700; color: #E8E8E8; margin-bottom: 4px; }
.qr-sub { font-size: .75rem; color: #666; }

/* ============================================================
   分享按钮
   ============================================================ */
.k1m2vypu {
  background: #141414;
  border-top: 1px solid #222;
  padding: 30px 20px;
}
.onw8gcf4 {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.pndvn1vn { font-size: .9rem; color: #888; font-weight: 600; }
.500ym4ni { display: flex; gap: 10px; flex-wrap: wrap; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 6px;
  font-size: .82rem;
  font-weight: 600;
  transition: all .2s;
  border: 1px solid transparent;
}
.0pv5b { background: rgba(7,193,96,.12); color: #07C160; border-color: rgba(7,193,96,.25); }
.0pv5b:hover { background: rgba(7,193,96,.2); color: #07C160; }
.8tjnq { background: rgba(230,22,45,.12); color: #E6162D; border-color: rgba(230,22,45,.25); }
.8tjnq:hover { background: rgba(230,22,45,.2); color: #E6162D; }
.g80ma6 { background: rgba(254,44,85,.12); color: #FE2C55; border-color: rgba(254,44,85,.25); }
.g80ma6:hover { background: rgba(254,44,85,.2); color: #FE2C55; }
.yi07qu3d { background: rgba(0,161,214,.12); color: #00A1D6; border-color: rgba(0,161,214,.25); }
.yi07qu3d:hover { background: rgba(0,161,214,.2); color: #00A1D6; }
.40yn7k95 { background: rgba(18,183,245,.12); color: #12B7F5; border-color: rgba(18,183,245,.25); }
.40yn7k95:hover { background: rgba(18,183,245,.2); color: #12B7F5; }

/* ============================================================
   面包屑
   ============================================================ */
.breadcrumb {
  background: #141414;
  border-bottom: 1px solid #1e1e1e;
  padding: 10px 20px;
}
.breadcrumb-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: .82rem;
  color: #666;
  flex-wrap: wrap;
}
.breadcrumb-inner a { color: #888; }
.breadcrumb-inner a:hover { color: #FF6B00; }
.breadcrumb-sep { color: #444; }
.breadcrumb-current { color: #FF6B00; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  background: #0A0A0A;
  border-top: 2px solid #1e1e1e;
  padding: 60px 20px 0;
}
.footer-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid #1e1e1e;
}
.footer-brand .logo-wrap { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.footer-brand img { width: 44px; height: 44px; border-radius: 8px; border: 2px solid #FF6B00; }
.footer-brand .brand-name { font-size: 1.4rem; font-weight: 900; color: #FF6B00; }
.footer-brand p { font-size: .87rem; color: #666; line-height: 1.7; margin-bottom: 20px; }
.footer-social { display: flex; gap: 10px; }
.social-btn {
  width: 36px; height: 36px;
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  color: #888;
  transition: all .2s;
}
.social-btn:hover { background: rgba(255,107,0,.15); border-color: #FF6B00; color: #FF6B00; }
.footer-col h4 {
  font-size: .95rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #FF6B00;
  display: inline-block;
}
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: .85rem; color: #666; transition: color .2s; }
.footer-col ul li a:hover { color: #FF6B00; }
.footer-bottom {
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  font-size: .82rem;
  color: #555;
}
.footer-bottom a { color: #666; }
.footer-bottom a:hover { color: #FF6B00; }
.footer-update { color: #FF6B00; font-weight: 600; }

/* ============================================================
   回到顶部
   ============================================================ */
.dzhq1 {
  position: fixed;
  bottom: 32px; right: 24px;
  width: 44px; height: 44px;
  background: #FF6B00;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: var(--shadow-orange);
  opacity: 0;
  pointer-events: none;
  transition: all .3s;
  z-index: 500;
  border: none;
}
.back-top.visible { opacity: 1; pointer-events: auto; }
.dzhq1:hover { transform: translateY(-3px); background: #CC5500; }

/* ============================================================
   内页 Hero
   ============================================================ */
.inner-hero {
  background: linear-gradient(135deg, #141414 0%, #0D0D0D 100%);
  border-bottom: 1px solid #1e1e1e;
  padding: 48px 20px;
  position: relative;
  overflow: hidden;
}
.inner-hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(255,107,0,.08) 0%, transparent 70%);
  border-radius: 50%;
}
.inner-hero-content { max-width: 1280px; margin: 0 auto; position: relative; z-index: 1; }
.inner-hero h1 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 900; color: #fff; margin-bottom: 10px; }
.inner-hero h1 .hl { color: #FF6B00; }
.inner-hero p { font-size: 1rem; color: #888; max-width: 600px; }

/* ============================================================
   通用工具类
   ============================================================ */
.text-orange { color: #FF6B00; }
.text-silver { color: #C0C0C0; }
.text-muted { color: #666; }
.font-bold { font-weight: 700; }
.font-black { font-weight: 900; }
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-24 { margin-bottom: 24px; }
.divider { height: 1px; background: #1e1e1e; margin: 40px 0; }
.tag-list { display: flex; gap: 8px; flex-wrap: wrap; }
.tag {
  font-size: .78rem;
  background: #1a1a1a;
  color: #888;
  border: 1px solid #2a2a2a;
  padding: 3px 10px;
  border-radius: 10px;
}
.tag-orange { background: rgba(255,107,0,.1); color: #FF6B00; border-color: rgba(255,107,0,.2); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .main-nav { display: none; }
  .hamburger { display: flex; }
  .nav-cta { display: none; }
  .hero-banner { min-height: 380px; }
  .hero-content { padding: 60px 20px; }
  .hero-stats { gap: 20px; }
  .section { padding: 48px 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
  .qr-grid { grid-template-columns: 1fr 1fr; }
  .search-hot-tags { display: none; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 1.7rem; }
  .hero-actions { flex-direction: column; }
  .btn-primary, .btn-outline { width: 100%; justify-content: center; }
  .video-grid { grid-template-columns: 1fr; }
  .qr-grid { grid-template-columns: 1fr; }
  .onw8gcf4 { flex-direction: column; align-items: flex-start; }
}

/* ============================================================
   懒加载占位
   ============================================================ */
img[loading="lazy"] { background: #1a1a1a; }
.lazy-placeholder {
  background: linear-gradient(90deg, #1a1a1a 25%, #222 50%, #1a1a1a 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* ============================================================
   动画
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp .5s ease forwards; }
.delay-1 { animation-delay: .1s; }
.delay-2 { animation-delay: .2s; }
.delay-3 { animation-delay: .3s; }