/* ============================================================
   STEEL MATRIX - 钢铁网格矩阵主题样式表
   风格：钢铁机甲风 (Steel Mecha Style)
   色彩体系：午夜黑 #B0BEC5 | 钢铁洋红 #455A64 | 钢铁青 #0091EA | 深空蓝 #FF1744 | 银灰 #0D0D0D
   ============================================================ */

/* === 本地字体加载 === */
@font-face {
  font-family: 'Chakra Petch';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/ChakraPetch-Regular.ttf') format('truetype');
}
@font-face {
  font-family: 'Chakra Petch';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/ChakraPetch-SemiBold.ttf') format('truetype');
}
@font-face {
  font-family: 'Chakra Petch';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/ChakraPetch-Bold.ttf') format('truetype');
}
@font-face {
  font-family: 'Exo 2';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/Exo2-Regular.ttf') format('truetype');
}
@font-face {
  font-family: 'Exo 2';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/Exo2-Medium.ttf') format('truetype');
}
@font-face {
  font-family: 'Exo 2';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/Exo2-SemiBold.ttf') format('truetype');
}
@font-face {
  font-family: 'Exo 2';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/Exo2-Bold.ttf') format('truetype');
}

/* === CSS变量 === */
:root {
  --steel-midnight: #B0BEC5;
  --steel-magenta: #455A64;
  --steel-cyan: #0091EA;
  --steel-deepblue: #FF1744;
  --steel-silver: #0D0D0D;
  --steel-bg-dark: #0a0a0f;
  --steel-bg-card: rgba(255, 23, 68, 0.08);
  --steel-bg-card-solid: #1a0a10;
  --steel-glow-magenta: 0 0 15px rgba(69, 90, 100, 0.6), 0 0 30px rgba(69, 90, 100, 0.3);
  --steel-glow-cyan: 0 0 15px rgba(0, 145, 234, 0.6), 0 0 30px rgba(0, 145, 234, 0.3);
  --steel-glow-red: 0 0 15px rgba(255, 23, 68, 0.5), 0 0 30px rgba(255, 23, 68, 0.2);
  --steel-font-heading: 'Chakra Petch', 'PingFang SC', sans-serif;
  --steel-font-body: 'Exo 2', 'Microsoft YaHei', sans-serif;
  --steel-radius: 2px;
  --steel-transition: 0.3s ease;
}

/* === 全局重置 === */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--steel-font-body);
  background-color: var(--steel-silver);
  color: var(--steel-midnight);
  line-height: 1.75;
  min-height: 100vh;
  overflow-x: hidden;
  background-image: url('../images/circuit-texture.webp');
  background-repeat: repeat;
  background-size: 400px 400px;
}

/* === 标题字体 === */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--steel-font-heading);
  font-weight: 700;
  line-height: 1.3;
  color: var(--steel-cyan);
  margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.6rem; }
h4 { font-size: 1.3rem; }
h5 { font-size: 1.1rem; }
h6 { font-size: 1rem; }

a {
  color: var(--steel-cyan);
  text-decoration: none;
  transition: color var(--steel-transition), text-shadow var(--steel-transition);
}

a:hover {
  color: var(--steel-midnight);
  text-shadow: 0 0 8px rgba(0, 145, 234, 0.5);
}

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

p {
  margin-bottom: 1rem;
  font-size: 1rem;
  line-height: 1.8;
}

/* === 导航栏 === */
.steel-nav-bar {
  position: relative;
  width: 100%;
  background: rgba(13, 13, 13, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 2px solid var(--steel-magenta);
  box-shadow: 0 2px 20px rgba(69, 90, 100, 0.3);
  z-index: 100;
  padding: 0 1rem;
}

.steel-nav-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.steel-nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.steel-nav-logo img {
  height: 36px;
  width: auto;
}

.steel-nav-links {
  display: flex;
  align-items: center;
  gap: 0;
  list-style: none;
}

.steel-nav-links li {
  position: relative;
}

.steel-nav-links li a {
  display: block;
  padding: 0.75rem 1rem;
  font-family: var(--steel-font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--steel-midnight);
  white-space: nowrap;
  transition: all var(--steel-transition);
  border-bottom: 2px solid transparent;
}

.steel-nav-links li a:hover {
  color: var(--steel-cyan);
  text-shadow: 0 0 10px rgba(0, 145, 234, 0.5);
  border-bottom-color: var(--steel-cyan);
}

.steel-nav-links li.steel-nav-active a {
  color: var(--steel-cyan);
  border-bottom-color: var(--steel-cyan);
  text-shadow: 0 0 12px rgba(0, 145, 234, 0.6);
  animation: steel-flicker-subtle 3s infinite;
}

.steel-nav-links li.steel-nav-active a::before {
  content: '';
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--steel-cyan);
  border-radius: 50%;
  margin-right: 6px;
  box-shadow: 0 0 8px var(--steel-cyan);
  animation: steel-pulse-dot 1.5s infinite;
}

/* 移动端菜单按钮 */
.steel-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.steel-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--steel-cyan);
  box-shadow: 0 0 6px var(--steel-cyan);
  transition: all var(--steel-transition);
}

/* === 面包屑导航 === */
.steel-breadcrumb {
  max-width: 1440px;
  margin: 1rem auto;
  padding: 0.75rem 1.5rem;
  font-size: 0.9rem;
  color: var(--steel-midnight);
}

.steel-breadcrumb a {
  color: var(--steel-cyan);
}

.steel-breadcrumb span {
  margin: 0 0.5rem;
  color: var(--steel-magenta);
}

/* === Hero区域 === */
.steel-hero-section {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: var(--steel-silver);
}

.steel-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 1;
}

.steel-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.steel-hero-overlay {
  position: absolute;
  inset: 0;
  background: rgba(26, 26, 46, 0.7);
  z-index: 2;
}

.steel-hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  max-width: 900px;
  padding: 2rem;
}

.steel-hero-content h1 {
  font-size: 3.25rem;
  color: var(--steel-cyan);
  text-shadow: 0 0 30px rgba(0, 145, 234, 0.7), 0 0 60px rgba(0, 145, 234, 0.3);
  margin-bottom: 1rem;
  animation: steel-flicker 4s infinite;
}

.steel-hero-subtitle {
  font-family: var(--steel-font-body);
  font-size: 1.35rem;
  color: var(--steel-midnight);
  margin-bottom: 1.5rem;
}

.steel-hero-text {
  font-size: 1rem;
  color: rgba(176, 190, 197, 0.85);
  line-height: 1.9;
  margin-bottom: 2rem;
}

.steel-hero-cta-group {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* === 按钮 === */
.steel-btn-primary {
  display: inline-block;
  padding: 14px 36px;
  font-family: var(--steel-font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--steel-silver);
  background: var(--steel-magenta);
  border: 2px solid var(--steel-magenta);
  cursor: pointer;
  text-align: center;
  transition: all var(--steel-transition);
  box-shadow: var(--steel-glow-magenta);
  min-width: 44px;
  min-height: 44px;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.steel-btn-primary:hover {
  background: transparent;
  color: var(--steel-magenta);
  box-shadow: 0 0 25px rgba(69, 90, 100, 0.8);
}

.steel-btn-secondary {
  display: inline-block;
  padding: 14px 36px;
  font-family: var(--steel-font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--steel-cyan);
  background: transparent;
  border: 2px solid var(--steel-cyan);
  cursor: pointer;
  text-align: center;
  transition: all var(--steel-transition);
  min-width: 44px;
  min-height: 44px;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.steel-btn-secondary:hover {
  box-shadow: var(--steel-glow-cyan);
  background: rgba(0, 145, 234, 0.1);
}

.steel-btn-danger {
  display: inline-block;
  padding: 14px 36px;
  font-family: var(--steel-font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background: var(--steel-deepblue);
  border: 2px solid var(--steel-deepblue);
  cursor: pointer;
  text-align: center;
  transition: all var(--steel-transition);
  min-width: 44px;
  min-height: 44px;
}

.steel-btn-danger:hover {
  box-shadow: var(--steel-glow-red);
}

/* === 模块通用容器 === */
.steel-section {
  max-width: 1440px;
  margin: 0 auto;
  padding: 4rem 1.5rem;
}

.steel-section-full {
  width: 100%;
  padding: 4rem 0;
}

.steel-section-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.steel-section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.steel-section-title h2 {
  font-size: 2.2rem;
  color: var(--steel-cyan);
  text-shadow: 0 0 20px rgba(0, 145, 234, 0.4);
  position: relative;
  display: inline-block;
  padding-bottom: 0.75rem;
}

.steel-section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--steel-cyan), transparent);
}

.steel-section-title p {
  color: rgba(176, 190, 197, 0.7);
  font-size: 1rem;
  margin-top: 0.75rem;
}

/* === 卡片系统 === */
.steel-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.steel-card {
  background: var(--steel-bg-card);
  border: 1px solid rgba(69, 90, 100, 0.3);
  padding: 1.5rem;
  transition: all var(--steel-transition);
  position: relative;
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.steel-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--steel-magenta), transparent);
  opacity: 0;
  transition: opacity var(--steel-transition);
}

.steel-card:hover {
  border-color: var(--steel-magenta);
  box-shadow: var(--steel-glow-magenta);
  transform: translateY(-4px);
}

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

.steel-card-image {
  width: 100%;
  aspect-ratio: 16/10;
  overflow: hidden;
  margin-bottom: 1rem;
  border: 1px solid rgba(69, 90, 100, 0.2);
}

.steel-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.steel-card:hover .steel-card-image img {
  transform: scale(1.05);
}

.steel-card h3 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.steel-card-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: rgba(176, 190, 197, 0.6);
  margin-bottom: 0.75rem;
}

.steel-card-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.steel-card p {
  font-size: 0.95rem;
  color: rgba(176, 190, 197, 0.8);
  margin-bottom: 1rem;
}

/* === 全息投影屏幕（影院模块） === */
.steel-cinema-screen {
  background: rgba(255, 23, 68, 0.05);
  border: 2px solid rgba(69, 90, 100, 0.4);
  padding: 2rem;
  position: relative;
}

.steel-cinema-screen::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 145, 234, 0.03) 2px,
    rgba(0, 145, 234, 0.03) 4px
  );
  pointer-events: none;
}

/* === 表单样式 === */
.steel-form-group {
  margin-bottom: 1.5rem;
}

.steel-form-label {
  display: block;
  font-family: var(--steel-font-heading);
  font-size: 0.9rem;
  color: var(--steel-cyan);
  margin-bottom: 0.5rem;
}

.steel-form-input {
  width: 100%;
  padding: 12px 16px;
  font-family: var(--steel-font-body);
  font-size: 1rem;
  color: var(--steel-midnight);
  background: rgba(255, 23, 68, 0.06);
  border: none;
  border-bottom: 2px solid var(--steel-magenta);
  outline: none;
  transition: all var(--steel-transition);
  min-height: 44px;
}

.steel-form-input:focus {
  border-bottom-color: var(--steel-cyan);
  box-shadow: 0 2px 10px rgba(0, 145, 234, 0.3);
  animation: steel-flicker-subtle 1s;
}

/* === VIP楼层 === */
.steel-vip-tower {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.steel-vip-floor {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--steel-bg-card);
  border-left: 3px solid var(--steel-magenta);
  transition: all var(--steel-transition);
  cursor: pointer;
}

.steel-vip-floor:hover {
  border-left-color: var(--steel-cyan);
  box-shadow: var(--steel-glow-cyan);
  transform: translateX(8px);
}

.steel-vip-floor-level {
  font-family: var(--steel-font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--steel-cyan);
  min-width: 60px;
  text-align: center;
  text-shadow: 0 0 15px rgba(0, 145, 234, 0.5);
}

/* === 安全认证 === */
.steel-security-badges {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 3rem;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.steel-security-badge {
  text-align: center;
  transition: all var(--steel-transition);
}

.steel-security-badge img {
  width: 120px;
  height: 120px;
  margin: 0 auto 0.75rem;
  border: 2px solid var(--steel-magenta);
  padding: 10px;
}

.steel-security-badge:hover {
  transform: scale(1.05);
}

.steel-security-badge:hover img {
  box-shadow: var(--steel-glow-magenta);
}

/* === 负责任博弈 === */
.steel-responsible-section {
  background: rgba(13, 13, 13, 0.95);
  border-top: 1px solid rgba(69, 90, 100, 0.2);
  padding: 3rem 0;
}

.steel-responsible-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  gap: 2rem;
  align-items: flex-start;
}

.steel-responsible-icon {
  flex-shrink: 0;
}

.steel-responsible-icon img {
  width: 100px;
  height: 100px;
  box-shadow: var(--steel-glow-red);
}

/* === 活动广场 === */
.steel-event-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.steel-event-item {
  padding: 1.5rem;
  background: var(--steel-bg-card);
  border: 1px solid rgba(69, 90, 100, 0.2);
  transition: all var(--steel-transition);
}

.steel-event-item:hover {
  border-color: var(--steel-cyan);
  box-shadow: var(--steel-glow-cyan);
}

.steel-event-item h4 {
  color: var(--steel-deepblue);
  margin-bottom: 0.5rem;
}

/* === 页脚 === */
.steel-footer {
  background: rgba(10, 10, 15, 0.98);
  border-top: 2px solid var(--steel-magenta);
  padding: 3rem 0 1.5rem;
}

.steel-footer-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.steel-footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 2rem;
}

.steel-footer-col h4 {
  font-family: var(--steel-font-heading);
  font-size: 1rem;
  color: var(--steel-cyan);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(69, 90, 100, 0.3);
}

.steel-footer-col ul {
  list-style: none;
}

.steel-footer-col ul li {
  margin-bottom: 0.5rem;
}

.steel-footer-col ul li a {
  font-size: 0.9rem;
  color: rgba(176, 190, 197, 0.7);
  transition: color var(--steel-transition);
}

.steel-footer-col ul li a:hover {
  color: var(--steel-cyan);
}

.steel-footer-social {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.steel-footer-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(69, 90, 100, 0.3);
  transition: all var(--steel-transition);
}

.steel-footer-social a:hover {
  border-color: var(--steel-cyan);
  box-shadow: var(--steel-glow-cyan);
}

.steel-footer-social a img {
  width: 24px;
  height: 24px;
}

.steel-footer-payments {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.steel-footer-payments img {
  height: 30px;
  width: auto;
  opacity: 0.6;
  transition: opacity var(--steel-transition);
}

.steel-footer-payments img:hover {
  opacity: 1;
}

.steel-footer-license {
  text-align: center;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(69, 90, 100, 0.15);
  margin-top: 1.5rem;
}

.steel-footer-license p {
  font-size: 0.85rem;
  color: rgba(176, 190, 197, 0.5);
  margin-bottom: 0.5rem;
}

.steel-footer-18plus {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 1rem;
}

.steel-footer-18plus img {
  width: 48px;
  height: 48px;
  box-shadow: var(--steel-glow-red);
}

.steel-footer-18plus p {
  font-size: 0.8rem;
  color: rgba(176, 190, 197, 0.5);
  max-width: 500px;
}

/* === 内页通用 === */
.steel-page-header {
  padding: 6rem 1.5rem 3rem;
  text-align: center;
  background: linear-gradient(180deg, rgba(13, 13, 13, 1) 0%, rgba(255, 23, 68, 0.05) 100%);
  border-bottom: 1px solid rgba(69, 90, 100, 0.15);
}

.steel-page-header h1 {
  font-size: 2.8rem;
  color: var(--steel-cyan);
  text-shadow: 0 0 25px rgba(0, 145, 234, 0.5);
}

.steel-page-header p {
  color: rgba(176, 190, 197, 0.7);
  max-width: 700px;
  margin: 1rem auto 0;
}

.steel-content-area {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.steel-content-area h2 {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(69, 90, 100, 0.15);
}

.steel-content-area h2:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: none;
}

.steel-content-image {
  margin: 2rem 0;
  border: 1px solid rgba(69, 90, 100, 0.2);
  overflow: hidden;
}

.steel-content-image img {
  width: 100%;
  height: auto;
  display: block;
}

/* === 数据表格 === */
.steel-data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.steel-data-table th {
  font-family: var(--steel-font-heading);
  background: rgba(69, 90, 100, 0.15);
  color: var(--steel-cyan);
  padding: 12px 16px;
  text-align: left;
  border-bottom: 2px solid var(--steel-magenta);
}

.steel-data-table td {
  padding: 10px 16px;
  border-bottom: 1px solid rgba(69, 90, 100, 0.1);
  color: var(--steel-midnight);
}

.steel-data-table tr:hover td {
  background: rgba(0, 145, 234, 0.05);
}

/* === APP下载页 === */
.steel-app-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.steel-app-phone {
  text-align: center;
}

.steel-app-phone img {
  max-width: 300px;
  margin: 0 auto;
  border: 2px solid var(--steel-magenta);
  box-shadow: var(--steel-glow-magenta);
}

.steel-app-downloads {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 2rem;
}

.steel-app-download-card {
  text-align: center;
  padding: 2rem;
  background: var(--steel-bg-card);
  border: 1px solid rgba(69, 90, 100, 0.3);
}

.steel-app-download-card img {
  width: 180px;
  height: 180px;
  margin: 0 auto 1rem;
}

/* === FAQ模块 === */
.steel-faq-item {
  margin-bottom: 1rem;
  border: 1px solid rgba(69, 90, 100, 0.2);
  background: var(--steel-bg-card);
}

.steel-faq-question {
  padding: 1rem 1.5rem;
  font-family: var(--steel-font-heading);
  font-weight: 600;
  color: var(--steel-cyan);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 44px;
}

.steel-faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--steel-magenta);
  transition: transform var(--steel-transition);
}

.steel-faq-item.steel-active .steel-faq-question::after {
  transform: rotate(45deg);
}

.steel-faq-answer {
  padding: 0 1.5rem;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
}

.steel-faq-item.steel-active .steel-faq-answer {
  max-height: 500px;
  padding: 0 1.5rem 1.5rem;
}

/* ============================================================
   动画效果
   ============================================================ */

/* 1. 钢铁闪烁 (Neon Flicker) */
@keyframes steel-flicker {
  0%, 100% { opacity: 1; text-shadow: 0 0 20px rgba(0, 145, 234, 0.7); }
  5% { opacity: 0.85; text-shadow: 0 0 10px rgba(0, 145, 234, 0.4); }
  10% { opacity: 1; text-shadow: 0 0 25px rgba(0, 145, 234, 0.8); }
  15% { opacity: 0.9; text-shadow: 0 0 15px rgba(0, 145, 234, 0.5); }
  50% { opacity: 1; text-shadow: 0 0 20px rgba(0, 145, 234, 0.7); }
  55% { opacity: 0.8; text-shadow: 0 0 8px rgba(0, 145, 234, 0.3); }
  57% { opacity: 1; text-shadow: 0 0 30px rgba(0, 145, 234, 0.9); }
}

@keyframes steel-flicker-subtle {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.92; }
  52% { opacity: 1; }
  80% { opacity: 0.95; }
}

@keyframes steel-pulse-dot {
  0%, 100% { box-shadow: 0 0 4px var(--steel-cyan); }
  50% { box-shadow: 0 0 12px var(--steel-cyan), 0 0 20px var(--steel-cyan); }
}

/* 2. 全息投影显现 (Hologram Reveal) */
@keyframes steel-hologram-reveal {
  0% {
    opacity: 0;
    transform: translateY(30px) scaleY(0.95);
    filter: blur(4px) hue-rotate(20deg);
    clip-path: inset(0 0 100% 0);
  }
  30% {
    opacity: 0.5;
    filter: blur(2px) hue-rotate(10deg);
    clip-path: inset(0 0 50% 0);
  }
  60% {
    opacity: 0.8;
    transform: translateY(5px) scaleY(1);
    filter: blur(0) hue-rotate(0deg);
    clip-path: inset(0 0 10% 0);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scaleY(1);
    filter: none;
    clip-path: inset(0 0 0 0);
  }
}

.steel-hologram {
  opacity: 0;
  transform: translateY(30px);
}

.steel-hologram.steel-revealed {
  animation: steel-hologram-reveal 0.8s ease-out forwards;
}

/* 3. 脉冲波纹 (Pulse Ripple) */
@keyframes steel-ripple {
  0% {
    box-shadow: 0 0 0 0 rgba(69, 90, 100, 0.4);
  }
  50% {
    box-shadow: 0 0 0 15px rgba(69, 90, 100, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(69, 90, 100, 0);
  }
}

.steel-ripple-hover:hover {
  animation: steel-ripple 0.6s ease-out;
}

/* 4. 数据流瀑布 (Data Waterfall) - Canvas背景 */
#mech-data-waterfall {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
  opacity: 0.08;
}

/* === 扫描线效果 === */
.steel-scanlines::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 145, 234, 0.015) 2px,
    rgba(0, 145, 234, 0.015) 4px
  );
  pointer-events: none;
  z-index: 10;
}

/* ============================================================
   响应式设计
   ============================================================ */

@media (max-width: 1280px) {
  .steel-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .steel-footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1024px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.6rem; }
  .steel-hero-content h1 { font-size: 2.5rem; }
  .steel-event-list { grid-template-columns: 1fr; }
  .steel-app-section { grid-template-columns: 1fr; }
}

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

  .steel-nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(13, 13, 13, 0.98);
    flex-direction: column;
    border-bottom: 2px solid var(--steel-magenta);
    padding: 1rem 0;
    z-index: 200;
  }

  .steel-nav-links.steel-nav-open {
    display: flex;
  }

  .steel-nav-links li a {
    padding: 1rem 1.5rem;
    font-size: 1rem;
  }

  /* 布局 */
  .steel-card-grid {
    grid-template-columns: 1fr;
  }

  .steel-hero-content h1 {
    font-size: 1.8rem;
  }

  .steel-hero-subtitle {
    font-size: 1.1rem;
  }

  .steel-section {
    padding: 2.5rem 1rem;
  }

  .steel-footer-grid {
    grid-template-columns: 1fr;
  }

  .steel-responsible-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .steel-security-badges {
    gap: 1.5rem;
  }

  .steel-app-downloads {
    grid-template-columns: 1fr;
  }

  .steel-page-header {
    padding: 4rem 1rem 2rem;
  }

  .steel-page-header h1 {
    font-size: 2rem;
  }
}

@media (max-width: 414px) {
  html { font-size: 14px; }
  .steel-hero-content h1 { font-size: 1.5rem; }
  .steel-hero-cta-group { flex-direction: column; align-items: center; }
  .steel-btn-primary, .steel-btn-secondary { width: 100%; max-width: 280px; }
}

@media (max-width: 320px) {
  html { font-size: 14px; }
  .steel-nav-inner { padding: 0 0.5rem; }
}

/* 4K适配 */
@media (min-width: 1920px) {
  .steel-section { max-width: 1600px; }
  .steel-section-inner { max-width: 1600px; }
  .steel-footer-inner { max-width: 1600px; }
  .steel-nav-inner { max-width: 1600px; }
  h1 { font-size: 3rem; }
}

/* === 打印样式 === */
@media print {
  .steel-nav-bar, .steel-footer, #mech-data-waterfall { display: none; }
  body { background: #fff; color: #000; }
}