/* ==========================================================================
   海豚加速器 (htjsq.xyz) 2026 高级品牌官网视觉设计系统
   视觉方向 A：深蓝 + 蓝紫电竞机甲科技风
   ========================================================================== */

:root {
  --color-bg: #080B16;
  --color-bg-alt: #0D1224;
  --color-surface: #111827;
  --color-surface-card: #141C33;
  --color-surface-hover: #1A2442;
  --color-primary: #267BFF;
  --color-primary-light: #3B92FF;
  --color-primary-glow: rgba(59, 146, 255, 0.4);
  --color-accent-purple: #7046DB;
  --color-accent-cyan: #00F0FF;
  --color-accent-cyan-glow: rgba(0, 240, 255, 0.4);
  --color-text-white: #FFFFFF;
  --color-text-muted: #AAB3C7;
  --color-text-dim: #717D96;
  --color-border: rgba(59, 146, 255, 0.18);
  --color-border-bright: rgba(59, 146, 255, 0.5);
  
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
  --container-max-width: 1240px;
  --nav-height: 80px;
  --transition-smooth: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 30px rgba(38, 123, 255, 0.35);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-bg);
  color: var(--color-text-white);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  line-height: 1.6;
  overflow-x: hidden;
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 链接与排版 */
a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-smooth);
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
  background: none;
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* 滚动条 */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: #1F2A4A;
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* ==========================================================================
   Header & 导航条
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  z-index: 1000;
  transition: var(--transition-smooth);
  background: transparent;
}

.site-header.scrolled {
  background: rgba(8, 11, 22, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(59, 146, 255, 0.15);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
  height: 70px;
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-logo img {
  height: 44px;
  width: auto;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 36px;
}

.site-nav a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding: 8px 0;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-text-white);
}

.site-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-cyan), var(--color-primary-light));
  transition: var(--transition-smooth);
  border-radius: 2px;
}

.site-nav a:hover::after,
.site-nav a.active::after {
  width: 100%;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* 按钮规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 28px;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  transition: var(--transition-smooth);
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 50%, var(--color-accent-purple) 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 20px rgba(38, 123, 255, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59, 146, 255, 0.65), 0 0 15px rgba(0, 240, 255, 0.5);
  border-color: rgba(255, 255, 255, 0.4);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-text-white);
  border: 1px solid rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-primary-light);
  transform: translateY(-2px);
  color: var(--color-primary-light);
}

.btn-lg {
  padding: 16px 38px;
  font-size: 1.1rem;
}

/* 汉堡按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.menu-toggle span {
  width: 100%;
  height: 2px;
  background-color: var(--color-text-white);
  border-radius: 2px;
  transition: var(--transition-smooth);
}

.menu-toggle.active span:nth-child(1) {
  transform: translateY(9px) rotate(45deg);
}
.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.active span:nth-child(3) {
  transform: translateY(-9px) rotate(-45deg);
}

/* ==========================================================================
   Hero 首屏沉浸式设计
   ========================================================================== */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: calc(var(--nav-height) + 20px);
  padding-bottom: 80px;
  background: url('../images/hero-bg.svg') center center / cover no-repeat;
  overflow: hidden;
}

.hero-overlay-grid {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 75% 30%, rgba(59, 146, 255, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 820px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(59, 146, 255, 0.12);
  border: 1px solid rgba(59, 146, 255, 0.35);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent-cyan);
  margin-bottom: 24px;
  backdrop-filter: blur(8px);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  background-color: var(--color-accent-cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-accent-cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4.2rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
  color: #FFFFFF;
  text-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
}

.hero-title .highlight {
  background: linear-gradient(135deg, #FFFFFF 20%, var(--color-primary-light) 60%, var(--color-accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--color-text-muted);
  max-width: 650px;
  margin: 0 auto 36px auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.hero-platform-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  color: var(--color-text-dim);
  font-size: 0.85rem;
}

.hero-platform-hint span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.hero-scroll-down {
  position: absolute;
  bottom: 25px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-dim);
  font-size: 0.75rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  z-index: 2;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.hero-scroll-down:hover {
  color: var(--color-primary-light);
}

.mouse-icon {
  width: 20px;
  height: 32px;
  border: 2px solid var(--color-text-dim);
  border-radius: 12px;
  position: relative;
}

.mouse-icon::after {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 6px;
  background: var(--color-primary-light);
  border-radius: 2px;
  animation: scrollDown 2s infinite;
}

@keyframes scrollDown {
  0% { transform: translate(-50%, 0); opacity: 1; }
  100% { transform: translate(-50%, 12px); opacity: 0; }
}

/* ==========================================================================
   全平台支持展示带
   ========================================================================== */
.platforms-section {
  position: relative;
  margin-top: -30px;
  z-index: 10;
  padding-bottom: 60px;
}

.platforms-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition-smooth);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.platform-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-primary-light), transparent);
  transform: translateX(-100%);
  transition: transform 0.5s ease;
}

.platform-card:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-bright);
  transform: translateY(-4px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4), var(--shadow-glow);
}

.platform-card:hover::before {
  transform: translateX(100%);
}

.platform-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: rgba(59, 146, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-primary-light);
  transition: var(--transition-smooth);
}

.platform-card:hover .platform-icon {
  background: var(--color-primary);
  color: #FFFFFF;
}

.platform-info h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 4px;
}

.platform-info p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.platform-badge {
  position: absolute;
  top: 10px;
  right: 12px;
  font-size: 0.7rem;
  padding: 2px 8px;
  background: rgba(0, 240, 255, 0.15);
  color: var(--color-accent-cyan);
  border-radius: 4px;
  font-weight: 600;
}

/* ==========================================================================
   板块公用标题
   ========================================================================== */
.section {
  padding: 100px 0;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 60px auto;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-primary-light);
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
  color: var(--color-text-white);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   核心产品理念 (大型图文交错结构，01/02/03)
   ========================================================================== */
.concept-item {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  margin-bottom: 90px;
}

.concept-item:last-child {
  margin-bottom: 0;
}

.concept-item.reverse {
  direction: rtl;
}

.concept-item.reverse .concept-text {
  direction: ltr;
}

.concept-text {
  position: relative;
}

.concept-num {
  font-size: 4rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(180deg, rgba(59, 146, 255, 0.4), rgba(112, 70, 219, 0.05));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 10px;
  font-family: 'Segoe UI', sans-serif;
}

.concept-text h3 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-text-white);
  margin-bottom: 16px;
}

.concept-text p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 24px;
}

.concept-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.concept-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--color-text-white);
}

.concept-features li svg {
  color: var(--color-accent-cyan);
  flex-shrink: 0;
}

.concept-visual {
  position: relative;
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.concept-visual::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(59, 146, 255, 0.15), transparent 70%);
  pointer-events: none;
}

/* ==========================================================================
   技术与体验展示 (5大核心能力)
   ========================================================================== */
.tech-section {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 50%, var(--color-bg) 100%);
  border-top: 1px solid rgba(59, 146, 255, 0.1);
  border-bottom: 1px solid rgba(59, 146, 255, 0.1);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.tech-card {
  background: rgba(17, 24, 39, 0.7);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: var(--transition-smooth);
  backdrop-filter: blur(8px);
}

.tech-card:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-bright);
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.4), 0 0 20px rgba(38, 123, 255, 0.2);
}

.tech-icon-wrap {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(59, 146, 255, 0.15), rgba(112, 70, 219, 0.25));
  border: 1px solid rgba(59, 146, 255, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent-cyan);
  margin-bottom: 24px;
}

.tech-card h4 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--color-text-white);
  margin-bottom: 12px;
}

.tech-card p {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ==========================================================================
   应用与游戏场景分类展示
   ========================================================================== */
.scenarios-filter {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 24px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition-smooth);
}

.filter-btn:hover,
.filter-btn.active {
  background: var(--color-primary);
  color: #FFFFFF;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 15px rgba(38, 123, 255, 0.4);
}

.scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.scenario-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: var(--transition-smooth);
}

.scenario-card:hover {
  border-color: var(--color-primary-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.scenario-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 10px;
  background: rgba(59, 146, 255, 0.15);
  color: var(--color-primary-light);
  border-radius: 4px;
  margin-bottom: 16px;
}

.scenario-card h4 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--color-text-white);
  margin-bottom: 10px;
}

.scenario-card p {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   客户端下载大横幅展示区 (双端展示)
   ========================================================================== */
.client-showcase-section {
  background: radial-gradient(circle at 50% 50%, rgba(59, 146, 255, 0.1) 0%, transparent 70%);
  overflow: hidden;
}

.client-showcase-box {
  background: linear-gradient(135deg, rgba(20, 28, 51, 0.8) 0%, rgba(13, 18, 36, 0.95) 100%);
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-lg);
  padding: 60px;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 50px;
  align-items: center;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.client-text h3 {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 16px;
}

.client-text p {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 30px;
}

.client-mockups-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mockup-desktop {
  width: 100%;
  max-width: 600px;
  border-radius: 12px;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.7);
  transition: var(--transition-smooth);
}

.mockup-mobile {
  position: absolute;
  right: -20px;
  bottom: -40px;
  width: 180px;
  border-radius: 24px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.8);
  transition: var(--transition-smooth);
}

.client-mockups-wrap:hover .mockup-desktop {
  transform: scale(1.02);
}
.client-mockups-wrap:hover .mockup-mobile {
  transform: translateY(-8px) scale(1.05);
}

/* ==========================================================================
   三步使用流程
   ========================================================================== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  position: relative;
}

.step-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 40px 30px;
  position: relative;
  text-align: center;
  transition: var(--transition-smooth);
}

.step-card:hover {
  border-color: var(--color-primary-light);
  transform: translateY(-5px);
  box-shadow: var(--shadow-card);
}

.step-number {
  font-size: 2.8rem;
  font-weight: 900;
  color: var(--color-primary-light);
  font-family: 'Segoe UI', sans-serif;
  opacity: 0.85;
  margin-bottom: 16px;
}

.step-card h4 {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--color-text-white);
  margin-bottom: 12px;
}

.step-card p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ==========================================================================
   套餐介绍
   ========================================================================== */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  align-items: stretch;
}

.pricing-card {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: var(--transition-smooth);
}

.pricing-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card);
}

.pricing-card.popular {
  border-color: var(--color-primary-light);
  background: linear-gradient(180deg, rgba(38, 123, 255, 0.12) 0%, rgba(20, 28, 51, 0.9) 100%);
  box-shadow: 0 10px 40px rgba(38, 123, 255, 0.25);
  transform: scale(1.03);
}

.pricing-card.popular:hover {
  transform: scale(1.03) translateY(-6px);
  box-shadow: 0 15px 50px rgba(38, 123, 255, 0.4);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-purple));
  color: #FFFFFF;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 4px 18px;
  border-radius: var(--radius-full);
  box-shadow: 0 4px 12px rgba(38, 123, 255, 0.4);
}

.pricing-header {
  text-align: center;
  padding-bottom: 24px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  margin-bottom: 24px;
}

.pricing-header h3 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--color-text-white);
  margin-bottom: 8px;
}

.pricing-header p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
}

.pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  margin: 16px 0 8px 0;
}

.currency {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary-light);
}

.amount {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-text-white);
  font-family: 'Segoe UI', sans-serif;
  margin: 0 4px;
}

.period {
  font-size: 0.9rem;
  color: var(--color-text-dim);
}

.pricing-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
  flex-grow: 1;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  color: var(--color-text-white);
}

.pricing-features li svg {
  color: var(--color-accent-cyan);
  flex-shrink: 0;
}

/* ==========================================================================
   FAQ 折叠列表
   ========================================================================== */
.faq-wrap {
  max-width: 820px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.faq-question {
  width: 100%;
  padding: 22px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-white);
  cursor: pointer;
  background: none;
  border: none;
}

.faq-icon {
  font-size: 1.3rem;
  transition: transform 0.3s ease;
  color: var(--color-primary-light);
}

.faq-item.active .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease-out;
  padding: 0 26px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
}

.faq-item.active .faq-answer {
  padding-bottom: 22px;
}

/* ==========================================================================
   Footer 页脚
   ========================================================================== */
.site-footer {
  background: #05070E;
  border-top: 1px solid rgba(59, 146, 255, 0.12);
  padding: 70px 0 30px 0;
  margin-top: auto;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 50px;
  margin-bottom: 50px;
}

.footer-brand p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-top: 16px;
  line-height: 1.7;
  max-width: 320px;
}

.footer-col h5 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-white);
  margin-bottom: 20px;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.footer-col a:hover {
  color: var(--color-primary-light);
}

.footer-bottom {
  padding-top: 30px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-dim);
  font-size: 0.85rem;
  flex-wrap: wrap;
  gap: 15px;
}

/* ==========================================================================
   下载弹窗 (Modal)
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 7, 14, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-container {
  background: linear-gradient(135deg, #11182D 0%, #0A0E1C 100%);
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  padding: 40px;
  position: relative;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.7), 0 0 40px rgba(38, 123, 255, 0.25);
  transform: translateY(20px) scale(0.96);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active .modal-container {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-smooth);
}

.modal-close:hover {
  background: var(--color-primary);
  color: #FFFFFF;
}

.modal-header {
  text-align: center;
  margin-bottom: 28px;
}

.modal-header h3 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-text-white);
  margin-bottom: 8px;
}

.modal-header p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.modal-platform-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-platform-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  background: var(--color-surface-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition-smooth);
}

.modal-platform-item:hover {
  border-color: var(--color-primary-light);
  background: var(--color-surface-hover);
}

.modal-platform-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.modal-platform-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text-white);
}

.modal-platform-desc {
  font-size: 0.8rem;
  color: var(--color-text-dim);
}

/* ==========================================================================
   响应式断点适配 (768px 平板 / 390px 手机端)
   ========================================================================== */
@media (max-width: 1024px) {
  .platforms-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .client-showcase-box {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .footer-top {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    width: 100%;
    background: rgba(8, 11, 22, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 30px 24px;
    gap: 20px;
    border-bottom: 1px solid rgba(59, 146, 255, 0.2);
    transform: translateY(-150%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
  }

  .site-nav.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .header-actions .btn {
    display: none;
  }

  .hero-section {
    padding-top: calc(var(--nav-height) + 40px);
  }

  .concept-item,
  .concept-item.reverse {
    grid-template-columns: 1fr;
    gap: 30px;
    direction: ltr;
  }

  .steps-grid,
  .pricing-grid,
  .scenarios-grid,
  .tech-grid {
    grid-template-columns: 1fr;
  }

  .pricing-card.popular {
    transform: none;
  }
  .pricing-card.popular:hover {
    transform: translateY(-6px);
  }

  .mockup-mobile {
    display: none;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

@media (max-width: 480px) {
  .platforms-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .client-showcase-box {
    padding: 30px 20px;
  }
  .modal-container {
    padding: 24px 16px;
  }
}

/* 动效降级支持 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}