/* ========================================
   GOM 游戏引擎网站 - 首页样式
   蓝白经典主题
   ======================================== */

/* ==========================================
   1. Hero 区域
   ========================================== */
.hero {
  position: relative;
  min-height: auto;
  padding: calc(var(--header-height) + var(--space-3xl)) 0 var(--space-3xl);
  display: block;
  overflow: hidden;
  background: var(--white);
}

.hero__bg {
  display: none;
}

.hero__grid {
  display: none;
}

.hero__glow {
  display: none;
}

.hero__content {
  display: grid;
  grid-template-columns: 0.98fr 1.02fr;
  gap: var(--space-xl);
  align-items: center;
  padding: var(--space-lg) 0;
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
}

.hero__text {
  min-width: 0;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 20px;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
  border: 1px solid rgba(37, 99, 235, 0.3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  color: var(--primary);
  margin-bottom: var(--space-lg);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  box-shadow: 
    0 4px 15px rgba(37, 99, 235, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.hero__badge::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent
  );
  animation: badge-shine 3s ease-in-out infinite;
}

@keyframes badge-shine {
  0% { left: -100%; }
  50%, 100% { left: 100%; }
}

.hero__badge .badge--pulse {
  width: 8px;
  height: 8px;
  background: #10b981;
  border-radius: 50%;
  animation: pulse-glow 2s ease-in-out infinite;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
}

@keyframes pulse-glow {
  0%, 100% { 
    transform: scale(1);
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.6);
  }
  50% { 
    transform: scale(1.2);
    box-shadow: 0 0 15px rgba(16, 185, 129, 0.8);
  }
}

.hero__badge-text {
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
}

.hero__badge-version {
  font-weight: 700;
  color: var(--primary);
  background: linear-gradient(135deg, #2563eb, #06b6d4);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 1px;
}

/* Hero Badge 轮播 */
.hero__badge-carousel {
  position: relative;
  height: 20px;
  overflow: hidden;
}

.hero__badge-slide {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  position: absolute;
  top: 0;
  left: 0;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(100%);
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero__badge-slide--active {
  opacity: 1;
  transform: translateY(0);
  position: relative;
}

.hero__badge-slide--exit {
  opacity: 0;
  transform: translateY(-100%);
}

.hero__title {
  font-size: clamp(1.8rem, 4vw, 3rem);
  font-weight: var(--font-weight-bold);
  line-height: 1.1;
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
}

.hero__title .gradient-text {
  background: linear-gradient(
    135deg,
    #2563eb 0%,
    #3b82f6 25%,
    #06b6d4 50%,
    #3b82f6 75%,
    #2563eb 100%
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 4s ease infinite;
  text-shadow: 0 0 40px rgba(59, 130, 246, 0.3);
  filter: drop-shadow(0 2px 4px rgba(37, 99, 235, 0.2));
  letter-spacing: 2px;
  font-weight: 800;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-xl);
}

.hero__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
}

.hero__actions-row {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  align-items: center;
}

.hero__actions-row .btn {
  flex: 1;
  min-width: 0;
  justify-content: center;
}

.hero__actions .btn--tech {
  padding: 13px 24px;
  font-size: var(--font-size-sm);
}

.hero__actions .btn--tech-outline {
  padding: 9px 22px;
  font-size: var(--font-size-sm);
}

/* 科技感按钮样式 */
.btn--tech {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 50%, #1e40af 100%);
  border: none;
  color: #fff;
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 14px 28px;
  border-radius: 10px;
  box-shadow: 
    0 4px 20px rgba(37, 99, 235, 0.4),
    0 2px 6px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.15);
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn--tech::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(255, 255, 255, 0.25),
    transparent
  );
  transition: left 0.6s ease;
}

.btn--tech:hover {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 50%, #1d4ed8 100%);
  transform: translateY(-3px);
  box-shadow: 
    0 8px 30px rgba(37, 99, 235, 0.5),
    0 4px 12px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn--tech:hover::before {
  left: 100%;
}

.btn--tech:active {
  transform: translateY(-1px);
  box-shadow: 
    0 4px 15px rgba(37, 99, 235, 0.4),
    0 2px 4px rgba(0, 0, 0, 0.1);
}

/* 科技感边框按钮 */
.btn--tech-outline {
  background: transparent;
  border: 2px solid rgba(37, 99, 235, 0.6);
  color: var(--primary);
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 12px 26px;
  border-radius: 10px;
  position: relative;
  overflow: hidden;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn--tech-outline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 100%;
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
  transition: width 0.3s ease;
  z-index: -1;
}

.btn--tech-outline:hover {
  border-color: transparent;
  color: #fff;
  transform: translateY(-3px);
  box-shadow: 
    0 8px 25px rgba(37, 99, 235, 0.4),
    0 4px 10px rgba(0, 0, 0, 0.1);
}

.btn--tech-outline:hover::before {
  width: 100%;
}

.btn--tech-outline:active {
  transform: translateY(-1px);
}

.hero__stats {
  display: flex;
  gap: var(--space-2xl);
  flex-wrap: wrap;
  row-gap: var(--space-md);
}

.hero__stat {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  flex: 0 0 auto;
  white-space: nowrap;
}

.hero__stat .counter {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-weight: var(--font-weight-normal);
  margin-left: var(--space-xs);
  display: inline-block;
  white-space: nowrap;
}

/* Hero 3D 图形 */
.hero__visual {
  display: flex;
  align-items: center;
  justify-content: center;
  perspective: 1000px;
  transform: translateX(4px);
}

.hero-laptop {
  width: min(100%, 680px);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-laptop__screen-shell {
  width: 100%;
  max-width: 656px;
  padding: 10px 10px 12px;
  background: linear-gradient(180deg, #4b5058 0%, #272b31 48%, #1b1f24 100%);
  border-radius: 18px 18px 12px 12px;
  box-shadow:
    0 20px 34px rgba(9, 12, 18, 0.18),
    0 40px 88px rgba(9, 12, 18, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    inset 0 -1px 0 rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  position: relative;
}

.hero-laptop__screen-shell::before {
  content: "";
  position: absolute;
  inset: 8px 8px 10px;
  border-radius: 13px 13px 10px 10px;
  box-shadow:
    inset 0 0 0 1px rgba(236, 239, 243, 0.18),
    inset 0 0 0 2px rgba(114, 121, 132, 0.22);
  pointer-events: none;
}

.hero-laptop__screen-shell::after {
  content: "";
  position: absolute;
  left: 54px;
  right: 54px;
  bottom: -20px;
  height: 30px;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(8, 10, 14, 0.2) 0%, rgba(8, 10, 14, 0.12) 46%, rgba(8, 10, 14, 0) 78%);
  filter: blur(12px);
  pointer-events: none;
}

.hero-laptop__camera {
  position: absolute;
  top: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #070809;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.06);
  z-index: 2;
}

.hero-laptop__screen {
  position: relative;
  aspect-ratio: 16 / 10;
  border-radius: 10px;
  overflow: hidden;
  background: #0d1014;
  box-shadow:
    inset 0 0 0 1px rgba(255, 255, 255, 0.05),
    0 1px 0 rgba(255, 255, 255, 0.06);
}

.hero-laptop__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.hero-laptop__slide.active {
  opacity: 1;
  pointer-events: auto;
}

.hero-laptop__slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-laptop__screen::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0.04) 20%, transparent 38%);
  pointer-events: none;
}

.hero-laptop__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.36);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 2;
}

.hero-laptop__nav--prev {
  left: 14px;
}

.hero-laptop__nav--next {
  right: 14px;
}

.hero-laptop__dots {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 2;
}

.hero-laptop__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  padding: 0;
  background: rgba(255, 255, 255, 0.45);
  cursor: pointer;
}

.hero-laptop__dot.active {
  background: var(--white);
}

/* Hero 滚动提示 */
.hero__scroll {
  display: none;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--primary), transparent);
}

/* ==========================================
   1.5 广告专区（三排网格布局）
   ========================================== */
.ad-banner {
  padding: var(--space-xl) 0;
  background: var(--bg-primary);
  position: relative;
  z-index: 10;
}

.ad-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(66, 133, 244, 0.15), transparent);
}

/* 网格容器 */
.ad-banner__grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.ad-banner__row {
  display: flex;
  gap: var(--space-md);
}

.ad-banner__row--double .ad-banner__slot {
  flex: 1;
  min-width: 0;
}

.ad-banner__row--single .ad-banner__slot {
  flex: 1;
}

/* 轮播容器 */
.ad-banner__slot {
  position: relative;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.08),
    0 1px 4px rgba(0, 0, 0, 0.04);
  transition: all var(--transition-normal);
}

.ad-banner__slot:hover {
  box-shadow:
    0 8px 40px rgba(0, 0, 0, 0.12),
    0 2px 8px rgba(0, 0, 0, 0.06);
  transform: translateY(-2px);
}

.ad-banner__viewport {
  overflow: hidden;
  width: 100%;
}

.ad-banner__track {
  display: flex;
  transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.ad-banner__slide {
  min-width: 100%;
  flex-shrink: 0;
  display: block;
  text-decoration: none;
  color: inherit;
}

/* 轮播指示点 */
.ad-banner__dots {
  display: none;
  position: absolute;
  bottom: 6px;
  left: 50%;
  transform: translateX(-50%);
  gap: 6px;
  z-index: 5;
  align-items: center;
}

.ad-banner__dots.is-active {
  display: flex;
}

.ad-banner__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  border: none;
  padding: 0;
  cursor: pointer;
  transition: all 0.3s ease;
}

.ad-banner__dot.is-current {
  width: 18px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.9);
}

.ad-banner__visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 130px; /* 双列广告位固定高度 */
  padding: var(--space-sm) var(--space-xl) var(--space-sm) calc(var(--space-xl) + 12px);
  overflow: hidden;
}

/* 单排广告稍矮一些 */
.ad-banner__row--single .ad-banner__visual {
  height: 130px; /* 单列广告位固定高度 */
}

/* 广告图片自适应容器 */
.ad-banner__visual--img {
  padding: 0;
}

.ad-banner__visual--img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

/* 网格背景纹理 */
.ad-banner__bg-pattern {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: 0;
  pointer-events: none;
}

/* 光晕效果 */
.ad-banner__glow {
  position: absolute;
  top: -40%;
  right: -10%;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.12) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

/* 左侧高亮装饰条 */
.ad-banner__visual::before {
  content: '';
  position: absolute;
  left: 0;
  top: 15%;
  bottom: 15%;
  width: 4px;
  border-radius: 0 4px 4px 0;
  background: rgba(255, 255, 255, 0.5);
  z-index: 3;
}

/* 渐变色 */
.ad-banner__visual--1 {
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 35%, #3b82f6 70%, #1e40af 100%);
}

.ad-banner__visual--2 {
  background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 35%, #8b5cf6 70%, #5b21b6 100%);
}

.ad-banner__visual--3 {
  background: linear-gradient(135deg, #059669 0%, #047857 35%, #10b981 70%, #065f46 100%);
}

.ad-banner__visual--4 {
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 35%, #ef4444 70%, #991b1b 100%);
}

/* 额外渐变主题 */
.ad-banner__visual--blue2 {
  background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 35%, #3b82f6 70%, #1d4ed8 100%);
}

.ad-banner__visual--green2 {
  background: linear-gradient(135deg, #16a34a 0%, #15803d 35%, #22c55e 70%, #166534 100%);
}

.ad-banner__visual--teal {
  background: linear-gradient(135deg, #0d9488 0%, #0f766e 35%, #14b8a6 70%, #115e59 100%);
}

.ad-banner__visual--orange {
  background: linear-gradient(135deg, #ea580c 0%, #c2410c 35%, #f97316 70%, #9a3412 100%);
}

.ad-banner__slide-content {
  position: relative;
  z-index: 2;
  max-width: 55%;
}

.ad-banner__tag {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  background: rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--white);
  letter-spacing: 0.8px;
  margin-bottom: var(--space-xs);
  text-transform: uppercase;
}

.ad-banner__title {
  font-size: clamp(0.95rem, 1.5vw, 1.25rem);
  font-weight: var(--font-weight-bold);
  color: var(--white);
  margin: 0 0 var(--space-xs) 0;
  line-height: var(--line-height-tight);
  letter-spacing: -0.02em;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.ad-banner__desc {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.8);
  margin: 0 0 var(--space-xs) 0;
  line-height: var(--line-height-relaxed);
  max-width: 420px;
}

/* CTA 按钮 */
.ad-banner__cta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 14px;
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-full);
  color: var(--white);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.3px;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.ad-banner__slot:hover .ad-banner__cta {
  background: rgba(255, 255, 255, 0.35);
  border-color: rgba(255, 255, 255, 0.5);
  transform: translateX(4px);
}

/* 装饰 SVG */
.ad-banner__deco {
  position: absolute;
  right: var(--space-xl);
  top: 50%;
  transform: translateY(-50%);
  width: 120px;
  height: 120px;
  opacity: 1;
  z-index: 1;
  pointer-events: none;
  animation: adDecoSpin 30s linear infinite;
}

@keyframes adDecoSpin {
  from { transform: translateY(-50%) rotate(0deg); }
  to   { transform: translateY(-50%) rotate(360deg); }
}

.ad-banner__deco-svg {
  width: 100%;
  height: 100%;
}

/* ==========================================
   2. 快速下载 - 科技感升级版
   ========================================== */
.quick-download {
  padding: var(--space-3xl) 0;
  position: relative;
  z-index: 10;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, #f0f4ff 100%);
  overflow: hidden;
}

.quick-download::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.3), transparent);
}

.quick-download__header {
  max-width: 860px;
  margin: 0 auto calc(var(--space-xl) + 4px);
  text-align: center;
}

.quick-download__header h2 {
  margin-bottom: var(--space-sm);
  font-size: clamp(1.5rem, 2vw, 2rem);
  font-weight: 700;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: 2px;
}

.quick-download__header p {
  margin: 0;
  color: var(--text-secondary);
  line-height: 1.7;
}

.quick-download__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
  max-width: 1200px;
  margin: 0 auto;
  align-items: stretch;
}

.quick-download__item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 16px;
  min-height: 324px;
  padding: 26px 14px 20px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: 20px;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 
    0 4px 20px rgba(17, 24, 39, 0.06),
    0 1px 3px rgba(17, 24, 39, 0.04);
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.quick-download__item:hover {
  transform: translateY(-6px);
  box-shadow: 
    0 20px 40px rgba(17, 24, 39, 0.12),
    0 0 0 1px var(--quick-glow, rgba(37, 99, 235, 0.2));
  border-color: var(--quick-glow, rgba(37, 99, 235, 0.3));
}

.quick-download__item::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 3px;
  background: var(--quick-accent, var(--primary));
}

.quick-download__item::after {
  content: "";
  position: absolute;
  inset: auto -40px -40px auto;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--quick-soft, rgba(66, 133, 244, 0.08));
  opacity: 0.6;
  pointer-events: none;
  transition: all 0.4s ease;
}

.quick-download__item:hover::after {
  transform: scale(1.3);
  opacity: 0.8;
}

.quick-download__item--a {
  --quick-accent: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #60a5fa 100%);
  --quick-soft: rgba(59, 130, 246, 0.12);
  --quick-glow: rgba(59, 130, 246, 0.3);
}

.quick-download__item--b {
  --quick-accent: linear-gradient(135deg, #7c3aed 0%, #8b5cf6 50%, #a78bfa 100%);
  --quick-soft: rgba(139, 92, 246, 0.12);
  --quick-glow: rgba(139, 92, 246, 0.3);
}

.quick-download__item--c {
  --quick-accent: linear-gradient(135deg, #0891b2 0%, #06b6d4 50%, #67e8f9 100%);
  --quick-soft: rgba(6, 182, 212, 0.12);
  --quick-glow: rgba(6, 182, 212, 0.3);
}

.quick-download__item--d {
  --quick-accent: linear-gradient(135deg, #d97706 0%, #f59e0b 50%, #fbbf24 100%);
  --quick-soft: rgba(245, 158, 11, 0.14);
  --quick-glow: rgba(245, 158, 11, 0.3);
}

.quick-download__item--a .quick-download__icon,
.quick-download__item--a .quick-download__link:hover {
  color: #2563eb;
}

.quick-download__item--b .quick-download__icon,
.quick-download__item--b .quick-download__link:hover {
  color: #7c3aed;
}

.quick-download__item--c .quick-download__icon,
.quick-download__item--c .quick-download__link:hover {
  color: #0891b2;
}

.quick-download__item--d .quick-download__icon,
.quick-download__item--d .quick-download__link:hover {
  color: #d97706;
}

.quick-download__icon {
  width: 78px;
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--quick-soft, rgba(66, 133, 244, 0.08));
  border-radius: 20px;
  flex-shrink: 0;
  color: var(--primary);
  box-shadow: 
    inset 0 0 0 1px rgba(255, 255, 255, 0.5),
    0 4px 15px rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
  position: relative;
}

.quick-download__item:hover .quick-download__icon {
  transform: scale(1.05);
  box-shadow: 
    inset 0 0 0 1px rgba(255, 255, 255, 0.6),
    0 8px 25px rgba(0, 0, 0, 0.08);
}

.quick-download__ok-icon,
.quick-download__nt-icon,
.quick-download__shenpan-icon,
.quick-download__qingyuan-icon {
  width: 66px;
  height: 66px;
  display: block;
}

.quick-download__ok-icon {
  filter: drop-shadow(0 6px 15px rgba(124, 58, 237, 0.25));
}

.quick-download__nt-icon {
  filter: drop-shadow(0 6px 15px rgba(37, 99, 235, 0.25));
}

.quick-download__shenpan-icon {
  filter: drop-shadow(0 6px 15px rgba(8, 145, 178, 0.25));
}

.quick-download__qingyuan-icon {
  filter: drop-shadow(0 6px 15px rgba(217, 119, 6, 0.25));
}

.quick-download__info {
  flex: 1;
  position: relative;
  z-index: 1;
  width: 100%;
  display: grid;
  justify-items: center;
  gap: 8px;
}

.quick-download__eyebrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  margin: 0;
  padding: 0 16px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: var(--font-weight-semibold);
  color: var(--white);
  background: var(--quick-accent, var(--primary));
  line-height: 1;
  white-space: nowrap;
  box-shadow: 0 4px 12px var(--quick-soft, rgba(66, 133, 244, 0.3));
  letter-spacing: 0.5px;
}

.quick-download__info h3 {
  font-size: clamp(1.95rem, 2vw, 2.15rem);
  font-weight: var(--font-weight-semibold);
  margin: 0;
  color: var(--text-primary);
  line-height: 1.2;
}

.quick-download__info p {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.65;
  max-width: 236px;
}

.quick-download__intro {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 6px;
  width: 100%;
  max-width: none;
  text-align: left;
}

.quick-download__intro li {
  display: grid;
  grid-template-columns: 14px 1fr;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-secondary);
}

.quick-download__intro-icon {
  width: 14px;
  height: 14px;
  color: currentColor;
  opacity: 0.9;
}

.quick-download__intro li span {
  display: block;
  white-space: nowrap;
}

.quick-download__link {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: auto;
  width: auto;
  min-height: 44px;
  min-width: 130px;
  padding: 0 24px;
  border-radius: 12px;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  border: 1px solid rgba(17, 24, 39, 0.1);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.quick-download__link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--quick-accent, linear-gradient(135deg, #2563eb, #3b82f6));
  opacity: 0;
  transition: opacity 0.3s ease;
}

.quick-download__link span {
  position: relative;
  z-index: 1;
  transition: color 0.3s ease;
}

.quick-download__link:hover {
  transform: translateY(-2px);
  border-color: transparent;
  box-shadow: 0 8px 20px var(--quick-soft, rgba(37, 99, 235, 0.25));
}

.quick-download__link:hover::before {
  opacity: 1;
}

.quick-download__link:hover span {
  color: #ffffff;
}

.quick-download__item--a .quick-download__icon {
  background: rgba(59, 130, 246, 0.18);
}

.quick-download__item--a .quick-download__eyebrow {
  background: #3b82f6;
  color: #ffffff;
}

.quick-download__item--b .quick-download__icon {
  background: rgba(139, 92, 246, 0.18);
}

.quick-download__item--b .quick-download__eyebrow {
  background: #8b5cf6;
  color: #ffffff;
}

.quick-download__item--c .quick-download__icon {
  background: rgba(6, 182, 212, 0.18);
}

.quick-download__item--c .quick-download__eyebrow {
  background: #06b6d4;
  color: #ffffff;
}

.quick-download__item--d .quick-download__icon {
  background: rgba(245, 158, 11, 0.2);
}

.quick-download__item--d .quick-download__eyebrow {
  background: #f59e0b;
  color: #ffffff;
}

/* ==========================================
   3. 功能特性 - 科技感升级版
   ========================================== */
.features {
  padding: var(--space-3xl) 0;
  position: relative;
  background: linear-gradient(180deg, #f0f4ff 0%, var(--bg-secondary) 100%);
  overflow: hidden;
}

.features::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.08) 0%, transparent 60%);
  pointer-events: none;
}

.features::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.2), transparent);
}

.features .container {
  position: relative;
  z-index: 1;
}

.features .section-title {
  margin-bottom: var(--space-2xl);
}

.features .section-title h2 {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 700;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.features .section-title p {
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-xl);
}

.features .card {
  position: relative;
  padding: 28px 24px;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.8);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  box-shadow: 
    0 4px 20px rgba(17, 24, 39, 0.06),
    0 1px 3px rgba(17, 24, 39, 0.04);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.features .card__header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 16px;
}

.features .card__header .card__icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  min-width: 36px;
  margin-bottom: 0;
}

.features .card__header h3.card__title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  line-height: 1;
  margin: 0;
  padding: 0;
  color: var(--text-primary);
  white-space: nowrap;
}

.features .card::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, #2563eb 0%, #3b82f6 50%, #06b6d4 100%);
}

.features .card::after {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    45deg,
    transparent 40%,
    rgba(59, 130, 246, 0.03) 50%,
    transparent 60%
  );
  transform: rotate(45deg) translateY(100%);
  transition: transform 0.6s ease;
}

.features .card:hover::after {
  transform: rotate(45deg) translateY(-100%);
}

.features .card:hover {
  transform: translateY(-8px);
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: 
    0 20px 40px rgba(59, 130, 246, 0.15),
    0 0 0 1px rgba(59, 130, 246, 0.1);
}

.features .card__icon {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
  color: #2563eb;
  transition: all 0.3s ease;
}

.features .card:hover .card__icon {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  color: #fff;
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
  transform: scale(1.05);
}

.features .card__icon .icon {
  width: 18px !important;
  height: 18px !important;
}

.features .card__icon--dark {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  color: #fff;
  box-shadow: 0 0 20px rgba(59, 130, 246, 0.34);
}

.features .card__icon--accent {
  background: linear-gradient(135deg, rgba(244, 162, 97, 0.15) 0%, rgba(251, 191, 36, 0.15) 100%);
  color: #d97706;
}

.features .card:hover .card__icon--accent {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #fff;
  box-shadow: 0 8px 20px rgba(245, 158, 11, 0.3);
}

.features .card__desc {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  color: var(--text-secondary);
  position: relative;
  z-index: 1;
}

/* ==========================================
   4. 功能介绍 - 科技感升级版
   ========================================== */
.intro {
  padding: var(--space-3xl) 0;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, #e8f0fe 50%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.intro::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(37, 99, 235, 0.15), transparent);
}

.intro .section-title h2 {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 700;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.intro__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
}

.intro__item {
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 
    0 4px 20px rgba(17, 24, 39, 0.05),
    0 1px 3px rgba(17, 24, 39, 0.03);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.intro__item::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, #2563eb, #06b6d4);
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.intro__item::after {
  content: '';
  position: absolute;
  bottom: -60px;
  right: -60px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(6, 182, 212, 0.05) 100%);
  transition: transform 0.4s ease;
}

.intro__item:hover::after {
  transform: scale(1.5);
}

.intro__item:hover {
  border-color: rgba(59, 130, 246, 0.25);
  transform: translateY(-6px);
  box-shadow: 
    0 20px 40px rgba(59, 130, 246, 0.12),
    0 0 0 1px rgba(59, 130, 246, 0.08);
}

.intro__header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-sm);
  position: relative;
  z-index: 1;
}

.intro__icon {
  width: 36px;
  height: 36px;
  min-width: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(6, 182, 212, 0.08) 100%);
  border-radius: 10px;
  color: #2563eb;
  transition: all 0.3s ease;
  box-shadow: inset 0 0 0 1px rgba(59, 130, 246, 0.1);
}

.intro__icon .icon {
  width: 18px !important;
  height: 18px !important;
}

.intro__item:hover .intro__icon {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  color: var(--white);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
  transform: scale(1.05);
}

.intro__icon--primary {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.25);
}

.intro__icon--accent {
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.15) 0%, rgba(251, 191, 36, 0.1) 100%);
  color: #d97706;
  box-shadow: inset 0 0 0 1px rgba(245, 158, 11, 0.15);
}

.intro__item:hover .intro__icon--accent {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: var(--white);
  box-shadow: 0 8px 20px rgba(245, 158, 11, 0.3);
}

.intro__item h3 {
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1;
  margin: 0;
  padding: 0;
  color: var(--text-primary);
  white-space: nowrap;
}

.intro__item p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
  position: relative;
  z-index: 1;
}

/* ==========================================
   5. 版本展示 - 科技感升级版
   ========================================== */
.versions {
  padding: var(--space-3xl) 0;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, #f0f4ff 50%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.versions::before {
  content: '';
  position: absolute;
  top: 20%;
  right: -200px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.versions::after {
  content: '';
  position: absolute;
  bottom: 20%;
  left: -200px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.versions__wrapper {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(360px, 1fr);
  gap: var(--space-xl);
  align-items: start;
  position: relative;
  z-index: 1;
}

.versions__display,
.versions__security {
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  box-shadow: 
    0 4px 25px rgba(17, 24, 39, 0.06),
    0 1px 3px rgba(17, 24, 39, 0.04);
  height: 100%;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.versions__display::before,
.versions__security::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #2563eb 0%, #3b82f6 50%, #06b6d4 100%);
}

.versions__security {
  display: flex;
  flex-direction: column;
}

.versions__header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  min-height: 84px;
}

.versions__title {
  margin: 0;
  font-size: var(--font-size-3xl);
  line-height: 1.2;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.versions__title span {
  background: linear-gradient(135deg, #2563eb 0%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.versions__subtitle {
  margin: 0;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.versions__tabs {
  display: inline-flex;
  gap: var(--space-xs);
  border-bottom: none;
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-full);
  padding: 4px;
  background: rgba(59, 130, 246, 0.05);
  backdrop-filter: blur(10px);
}

.versions__tabs .tab {
  border-radius: var(--radius-full);
  padding: 10px 16px;
  font-size: var(--font-size-sm);
  line-height: 1;
  transition: all 0.3s ease;
  color: var(--text-secondary);
}

.versions__tabs .tab:hover {
  color: var(--primary);
  background: rgba(59, 130, 246, 0.08);
}

.versions__tabs .tab--active {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  color: var(--white);
  border: none;
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.35);
}

.versions__tabs .tab--active::after {
  display: none;
}

.versions__panels {
  margin-top: var(--space-lg);
}

.versions__panel.hidden {
  display: none;
}

.versions__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
  align-items: stretch;
}

.version-card {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 2px 10px rgba(17, 24, 39, 0.04);
  display: flex;
  flex-direction: column;
}

.version-card:hover {
  transform: translateY(-5px);
  border-color: rgba(59, 130, 246, 0.3);
  box-shadow: 
    0 15px 35px rgba(59, 130, 246, 0.12),
    0 0 0 1px rgba(59, 130, 246, 0.08);
}

.version-card__image {
  height: 140px;
  position: relative;
  overflow: hidden;
}

.version-card__thumb {
  width: 100%;
  height: 100%;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: var(--space-sm) var(--space-sm) var(--space-xs);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.version-card__thumb::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0) 55%, rgba(0, 0, 0, 0.36) 100%);
}

.version-card__badge {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0.15) 100%);
  color: var(--white);
  font-size: var(--font-size-xs);
  border: 1px solid rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(8px);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.version-card__thumb--single-1,
.version-card__thumb--three-1,
.version-card__thumb--hero-1 {
  background-image: url('../images/version-thumbs/single-1.svg');
}

.version-card__thumb--single-2,
.version-card__thumb--three-2,
.version-card__thumb--hero-2 {
  background-image: url('../images/version-thumbs/single-2.svg');
}

.version-card__thumb--single-3,
.version-card__thumb--three-3,
.version-card__thumb--hero-3 {
  background-image: url('../images/version-thumbs/single-3.svg');
}

.version-card__thumb--single-4,
.version-card__thumb--three-4,
.version-card__thumb--hero-4 {
  background-image: url('../images/version-thumbs/single-4.svg');
}

.version-card__thumb--three-1,
.version-card__thumb--three-3 {
  background-image: url('../images/version-thumbs/team-1.svg');
}

.version-card__thumb--hero-1,
.version-card__thumb--hero-2,
.version-card__thumb--hero-4 {
  background-image: url('../images/version-thumbs/hero-1.svg');
}

.version-card__name {
  font-size: var(--font-size-lg);
  margin: var(--space-sm) var(--space-md) var(--space-xs);
  color: var(--text-primary);
  line-height: var(--line-height-tight);
}

.version-card__desc {
  margin: 0 var(--space-md) var(--space-sm);
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
  line-height: var(--line-height-normal);
  min-height: 30px;
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-md);
  align-items: stretch;
  margin-bottom: var(--space-md);
}

.security-card {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.04) 0%, rgba(6, 182, 212, 0.03) 100%);
  border: 1px solid rgba(59, 130, 246, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-sm);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  min-height: 96px;
  position: relative;
  overflow: hidden;
}

.security-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, #2563eb 0%, #06b6d4 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.security-card:hover::before {
  opacity: 1;
}

.security-card:hover {
  border-color: rgba(59, 130, 246, 0.25);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.1);
  transform: translateY(-2px);
}

.security-card__icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #2563eb;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12) 0%, rgba(6, 182, 212, 0.08) 100%);
  flex-shrink: 0;
  transition: all 0.3s ease;
}

.security-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.security-card:hover .security-card__icon {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  color: #fff;
  box-shadow: 0 6px 15px rgba(59, 130, 246, 0.25);
}

.security-card__title {
  margin: 0;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  line-height: 1;
}

.security-card__desc {
  margin: 0;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  line-height: var(--line-height-normal);
  padding-left: 0;
}

.security-ad {
  margin-top: auto;
  border: 1px solid rgba(var(--primary-rgb), 0.12);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: relative;
  background: var(--white);
  box-shadow: var(--shadow-sm);
}

.security-ad__viewport {
  position: relative;
  aspect-ratio: 16 / 10;
  min-height: 220px;
}

.security-ad__slide {
  position: absolute;
  inset: 0;
  display: block;
  overflow: hidden;
  background: #eef2f7;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.security-ad__slide.active {
  opacity: 1;
  pointer-events: auto;
}

.security-ad__slide img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  display: block;
}

.security-ad__caption {
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 10px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  background: rgba(0, 0, 0, 0.48);
  color: var(--white);
  font-size: var(--font-size-xs);
}

.security-ad__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.38);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.security-ad[hidden],
.security-ad__nav[hidden],
.security-ad__dots[hidden] {
  display: none !important;
}

.security-ad__nav--prev {
  left: 8px;
}

.security-ad__nav--next {
  right: 8px;
}

.security-ad__dots {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
}

.security-ad__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  border: none;
  padding: 0;
  background: rgba(255, 255, 255, 0.5);
  cursor: pointer;
}

.security-ad__dot.active {
  background: var(--white);
}

/* ==========================================
   6. 教程与社区 - 科技感升级版
   ========================================== */
.community {
  padding: var(--space-3xl) 0;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, #e8f0fe 50%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.community::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 1000px;
  height: 600px;
  background: radial-gradient(ellipse, rgba(59, 130, 246, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

.community .section-title h2 {
  font-size: clamp(1.5rem, 2.5vw, 2.2rem);
  font-weight: 700;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.community .section-title p {
  white-space: nowrap;
  text-align: center;
  max-width: none;
}

.community__grid {
  display: grid;
  grid-template-columns: 1fr 1fr 280px;
  gap: var(--space-xl);
  align-items: stretch;
  position: relative;
  z-index: 1;
}

/* 教程卡片 */
.community__tutorials {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.community__tutorials .tutorial-card {
  display: flex;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl);
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 
    0 4px 15px rgba(17, 24, 39, 0.04),
    0 1px 3px rgba(17, 24, 39, 0.03);
  backdrop-filter: blur(10px);
}

.community__tutorials .tutorial-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-4px) translateX(4px);
  box-shadow: 
    0 15px 35px rgba(59, 130, 246, 0.12),
    0 0 0 1px rgba(59, 130, 246, 0.08);
}

.community__tutorials .tutorial-card__thumb {
  width: 120px;
  min-width: 120px;
  height: 100px;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12) 0%, rgba(6, 182, 212, 0.08) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  position: relative;
  overflow: hidden;
}

.community__tutorials .tutorial-card__thumb::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 60px;
  height: 60px;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.15) 0%, transparent 70%);
  transform: translate(-50%, -50%);
}

.community__tutorials .tutorial-card__body {
  flex: 1;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.community__tutorials .tutorial-card__body .tag {
  font-size: 11px;
  padding: 3px 10px;
  margin-bottom: 6px;
  width: fit-content;
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(6, 182, 212, 0.08) 100%);
  color: #2563eb;
  border-radius: 999px;
}

.community__tutorials .tutorial-card__body h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin: 0 0 4px;
  color: var(--text-primary);
}

.community__tutorials .tutorial-card__body p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* 交流群组 */
.community__groups {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.community__groups .group-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-lg);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 
    0 4px 15px rgba(17, 24, 39, 0.04),
    0 1px 3px rgba(17, 24, 39, 0.03);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.community__groups .group-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, #12B7F5 0%, #0D9FDB 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.community__groups .group-item:hover::before {
  opacity: 1;
}

.community__groups .group-item:hover {
  border-color: rgba(18, 183, 245, 0.25);
  transform: translateX(6px);
  box-shadow: 
    0 12px 30px rgba(18, 183, 245, 0.1),
    0 0 0 1px rgba(18, 183, 245, 0.08);
}

/* 联系我们 */
.community__contact {
  display: flex;
  flex-direction: column;
}

.community__contact .contact-card {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.8);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  text-align: center;
  box-shadow: 
    0 4px 20px rgba(17, 24, 39, 0.05),
    0 1px 3px rgba(17, 24, 39, 0.03);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.community__contact .contact-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, #2563eb 0%, #06b6d4 100%);
}

.community__contact .contact-card h3 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.community__contact .contact-card__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(6, 182, 212, 0.03) 100%);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-md);
  text-align: left;
  border: 1px solid rgba(59, 130, 246, 0.08);
  transition: all 0.3s ease;
}

.community__contact .contact-card__item:hover {
  border-color: rgba(59, 130, 246, 0.2);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(6, 182, 212, 0.05) 100%);
}

.community__contact .contact-card__icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  border-radius: var(--radius-md);
  color: var(--white);
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.community__contact .contact-card__icon--qq {
  background: linear-gradient(135deg, #12B7F5 0%, #0D9FDB 100%);
  box-shadow: 0 4px 12px rgba(18, 183, 245, 0.25);
}

.community__contact .contact-card__label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin: 0;
}

.community__contact .contact-card__value {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  margin: 0;
}

.community__contact .contact-card__qrcode {
  width: 160px;
  height: 160px;
  margin: auto auto var(--space-xs);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(6, 182, 212, 0.03) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  border: 1px solid rgba(59, 130, 246, 0.1);
}

.community__contact .contact-card__tip {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

/* 保留旧样式兼容 */
.group-item__num {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--white);
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.group-item__icon {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #12B7F5 0%, #0D9FDB 100%);
  border-radius: var(--radius-md);
  color: var(--white);
  flex-shrink: 0;
  box-shadow: 0 6px 18px rgba(18, 183, 245, 0.35);
  transition: all 0.3s ease;
}

.group-item:hover .group-item__icon {
  transform: scale(1.05);
  box-shadow: 0 8px 25px rgba(18, 183, 245, 0.45);
}

.group-item__icon .icon {
  width: 22px;
  height: 20px;
}

.group-item__info {
  flex: 1;
}

.group-item__info h4 {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-xs);
  color: var(--text-primary);
}

.group-item__id {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* ==========================================
   8. CTA 区域 - 科技感升级版
   ========================================== */
.cta {
  padding: var(--space-4xl) 0;
  text-align: center;
  background: linear-gradient(180deg, var(--bg-secondary) 0%, #e8f0fe 50%, var(--bg-secondary) 100%);
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 1000px;
  height: 500px;
  background: radial-gradient(ellipse, rgba(59, 130, 246, 0.08) 0%, rgba(6, 182, 212, 0.05) 30%, transparent 60%);
  pointer-events: none;
}

.cta::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
}

.cta__content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3xl);
  position: relative;
  z-index: 1;
}

.cta__text {
  text-align: left;
}

.cta__content h2 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
  white-space: nowrap;
}

.cta__content h2 .gradient-text {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #06b6d4 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 4s ease infinite;
  background-size: 200% 200%;
}

.cta__content p {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin: 0;
}

.cta__actions {
  display: flex;
  gap: var(--space-md);
  flex-shrink: 0;
}

.cta__actions .btn--primary {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 50%, #06b6d4 100%);
  border: none;
  color: #fff;
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.35);
  position: relative;
  overflow: hidden;
}

.cta__actions .btn--primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s ease;
}

.cta__actions .btn--primary:hover::before {
  left: 100%;
}

.cta__actions .btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 35px rgba(59, 130, 246, 0.45);
}

.cta__actions .btn--ghost {
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: var(--text-primary);
  backdrop-filter: blur(10px);
}

.cta__actions .btn--ghost:hover {
  background: rgba(255, 255, 255, 1);
  border-color: rgba(59, 130, 246, 0.4);
  color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(59, 130, 246, 0.15);
}

/* ==========================================
   动画
   ========================================== */
@keyframes rotateCube {
  0% {
    transform: rotateX(0deg) rotateY(0deg);
  }
  100% {
    transform: rotateX(360deg) rotateY(360deg);
  }
}

/* ==========================================
   响应式
   ========================================== */
@media (max-width: 1200px) {
  .hero__content {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .hero__actions {
    justify-content: center;
  }

  .hero__stats {
    justify-content: center;
  }

  .hero__visual {
    display: flex;
  }

  .hero-laptop {
    max-width: 560px;
  }

  .quick-download__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .quick-download__item {
    min-height: 252px;
  }

  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .intro__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .versions__wrapper {
    grid-template-columns: 1fr;
  }

  .versions__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .versions__display,
  .versions__security {
    padding: var(--space-lg);
    height: auto;
  }

  .security-ad {
    margin-top: var(--space-md);
  }

  .versions__header {
    min-height: auto;
  }

  .community__grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .ad-banner__visual {
    min-height: 70px;
    padding: var(--space-sm) var(--space-lg) var(--space-sm) calc(var(--space-lg) + 10px);
  }

  .ad-banner__row--single .ad-banner__visual {
    min-height: 60px;
  }

  .ad-banner__title {
    font-size: var(--font-size-xl);
  }

  .ad-banner__deco {
    width: 180px;
    height: 180px;
    right: var(--space-lg);
  }
}

@media (max-width: 768px) {
  .hero__title {
    font-size: var(--font-size-3xl);
  }

  .hero__actions {
    align-items: center;
  }

  .hero__actions-row {
    flex-direction: column;
    width: 100%;
    max-width: 300px;
    gap: var(--space-sm);
  }

  .hero__actions .btn--tech,
  .hero__actions .btn--tech-outline {
    width: 100%;
    justify-content: center;
  }

  .hero__stats {
    flex-direction: column;
    gap: var(--space-md);
  }

  .hero__visual {
    display: none;
  }

  .quick-download__grid {
    grid-template-columns: 1fr;
  }

  .quick-download__header {
    margin-bottom: var(--space-lg);
  }

  .features__grid,
  .intro__grid {
    grid-template-columns: 1fr;
  }

  .community__grid {
    grid-template-columns: 1fr;
  }

  .community__contact .contact-card__qrcode {
    width: 140px;
    height: 140px;
  }

  .versions__grid {
    grid-template-columns: 1fr;
  }

  .versions__tabs {
    width: 100%;
    overflow-x: auto;
  }

  .versions__tabs .tab {
    white-space: nowrap;
  }

  .security-card {
    grid-template-columns: 36px 1fr;
    gap: var(--space-sm);
  }

  .security-grid {
    grid-template-columns: 1fr;
  }

  .security-ad__viewport {
    min-height: 200px;
  }

  .ad-banner {
    padding: var(--space-lg) 0;
  }

  .ad-banner__row--double {
    flex-direction: column;
  }

  .ad-banner__visual {
    min-height: 65px;
    padding: var(--space-xs) var(--space-md) var(--space-xs) calc(var(--space-md) + 8px);
  }

  .ad-banner__row--single .ad-banner__visual {
    min-height: 55px;
  }

  .ad-banner__slide-content {
    max-width: 100%;
  }

  .ad-banner__tag {
    margin-bottom: var(--space-sm);
    padding: 4px 12px;
    font-size: 11px;
  }

  .ad-banner__title {
    font-size: var(--font-size-lg);
  }

  .ad-banner__desc {
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-sm);
  }

  .ad-banner__cta {
    padding: 7px 16px;
    font-size: var(--font-size-xs);
  }

  .ad-banner__deco {
    display: none;
  }

  .ad-banner__glow {
    width: 250px;
    height: 250px;
  }

  .ad-banner__slot {
    border-radius: var(--radius-xl);
  }

  .ad-banner__dots {
    bottom: 4px;
  }

  .ad-banner__dot {
    width: 5px;
    height: 5px;
  }

  .ad-banner__dot.is-current {
    width: 14px;
  }

  .tab {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--font-size-sm);
  }

  .cta__content {
    flex-direction: column;
    gap: var(--space-xl);
  }

  .cta__text {
    text-align: center;
  }

  .cta__content h2 {
    font-size: var(--font-size-2xl);
    white-space: normal;
  }

  .cta__actions {
    flex-direction: column;
    width: 100%;
    max-width: 280px;
  }
}