/* ============================================================
   custom.css — 毅柏科技 自定义样式
   包含：CSS变量 / 渐变文字 / 光效 / 暗色卡片 / FAQ手风琴
         导航栏滚动 / 悬浮栏 / 科技感装饰 / 响应式 / AOS / Swiper
============================================================ */

/* ---------------------------------------------------------
   1. CSS变量体系
--------------------------------------------------------- */
:root {
  /* 颜色 */
  --color-dark: #0b1120;
  --color-darker: #070d1a;
  --color-card: #111c30;
  --color-border: #1e293b;
  --color-cyan: #06b6d4;
  --color-blue: #3b82f6;
  --color-purple: #8b5cf6;
  --color-neon: #22d3ee;
  --color-light: #e2e8f0;
  --color-muted: #94a3b8;
  --color-dim: #64748b;

  /* 间距 */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  /* 字体 */
  --font-sans: 'Inter', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
  --font-mono: 'Fira Code', 'JetBrains Mono', monospace;

  /* 圆角 */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;

  /* 过渡 */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;

  /* 阴影 */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --shadow-glow-cyan: 0 0 20px rgba(6, 182, 212, 0.3);
  --shadow-glow-blue: 0 0 20px rgba(59, 130, 246, 0.3);
}

/* ---------------------------------------------------------
   2. 全局基础样式
--------------------------------------------------------- */
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--color-dark);
  color: var(--color-light);
  line-height: 1.7;
  overflow-x: hidden;
  /* 深蓝渐变背景 + 微噪点纹理，避免纯黑感 */
  background-image:
    radial-gradient(ellipse at 20% 50%, rgba(6, 182, 212, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(59, 130, 246, 0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 100%, rgba(139, 92, 246, 0.02) 0%, transparent 50%);
}

/* 选择文本颜色 */
::selection {
  background-color: rgba(6, 182, 212, 0.3);
  color: #ffffff;
}

/* bg-yibo-darker 替代区域的层次感 */
.bg-yibo-darker {
  background-color: var(--color-darker);
  background-image:
    radial-gradient(ellipse at 30% 0%, rgba(6, 182, 212, 0.02) 0%, transparent 40%),
    radial-gradient(ellipse at 70% 100%, rgba(59, 130, 246, 0.02) 0%, transparent 40%);
}

/* bg-yibo-dark 替代区域的层次感 */
.bg-yibo-dark {
  background-color: var(--color-dark);
}

/* 滚动条样式 */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--color-darker);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-cyan);
}

/* 图片默认 */
img {
  max-width: 100%;
  height: auto;
}

/* 链接默认 */
a {
  text-decoration: none;
  color: inherit;
}

/* ---------------------------------------------------------
   3. 渐变文字效果
--------------------------------------------------------- */
.u-gradient-text {
  background: linear-gradient(to right, var(--color-cyan), var(--color-blue));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.u-gradient-text-alt {
  background: linear-gradient(to right, var(--color-blue), var(--color-purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.u-gradient-text-neon {
  background: linear-gradient(to right, var(--color-neon), var(--color-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---------------------------------------------------------
   4. 光效效果
--------------------------------------------------------- */
.u-glow {
  box-shadow: var(--shadow-glow-cyan);
}

.u-glow-blue {
  box-shadow: var(--shadow-glow-blue);
}

.u-glow-text {
  text-shadow: 0 0 10px rgba(6, 182, 212, 0.5), 0 0 30px rgba(6, 182, 212, 0.2);
}

/* 光效装饰球 — 用于背景 */
.u-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
}

.u-orb-cyan {
  background: radial-gradient(circle, var(--color-cyan), transparent 70%);
}

.u-orb-blue {
  background: radial-gradient(circle, var(--color-blue), transparent 70%);
}

.u-orb-purple {
  background: radial-gradient(circle, var(--color-purple), transparent 70%);
}

/* 脉冲光效 */
.u-pulse-glow {
  animation: pulseGlowVar 2s ease-in-out infinite;
}

@keyframes pulseGlowVar {
  0%, 100% {
    box-shadow: 0 0 5px rgba(6, 182, 212, 0.3);
  }
  50% {
    box-shadow: 0 0 20px rgba(6, 182, 212, 0.6), 0 0 40px rgba(6, 182, 212, 0.2);
  }
}

/* 渐变线 */
.u-gradient-line {
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-border), transparent);
}

.u-gradient-line-cyan {
  height: 2px;
  background: linear-gradient(to right, transparent, var(--color-cyan), var(--color-blue), transparent);
  border-radius: 1px;
}

/* ---------------------------------------------------------
   5. 暗色卡片样式
--------------------------------------------------------- */
.u-card-dark {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.u-card-dark:hover {
  border-color: rgba(6, 182, 212, 0.3);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(6, 182, 212, 0.1);
  transform: translateY(-2px);
}

.u-card-dark-static {
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
}

/* 卡片内部光效（顶部） */
.u-card-glow-top {
  position: relative;
  overflow: hidden;
}

.u-card-glow-top::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-cyan), transparent);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.u-card-glow-top:hover::before {
  opacity: 1;
}

/* ---------------------------------------------------------
   6. FAQ手风琴样式
--------------------------------------------------------- */
.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item:hover {
  border-color: rgba(6, 182, 212, 0.2);
}

.faq-item.active {
  border-color: rgba(6, 182, 212, 0.4);
  box-shadow: 0 0 20px rgba(6, 182, 212, 0.05);
}

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1.25rem 1.5rem;
  background: transparent;
  border: none;
  color: var(--color-light);
  font-size: 1rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: color var(--transition-fast);
  min-height: 44px; /* 最小触控区域 */
}

.faq-question:hover {
  color: var(--color-cyan);
}

.faq-question:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: -2px;
  border-radius: var(--radius-md);
}

.faq-question svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-normal);
  color: var(--color-cyan);
  flex-shrink: 0;
  margin-left: 1rem;
}

.faq-item.active .faq-question svg {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal), padding var(--transition-normal);
}

.faq-item.active .faq-answer {
  max-height: 500px;
}

.faq-answer p {
  padding: 0 1.5rem 1.25rem;
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.8;
}

/* ---------------------------------------------------------
   7. 导航栏滚动效果
--------------------------------------------------------- */
#site-header {
  background-color: transparent;
  transition: background-color var(--transition-normal),
              box-shadow var(--transition-normal),
              backdrop-filter var(--transition-normal);
}

#site-header.scrolled {
  background-color: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

#site-header.scrolled #header-border {
  opacity: 1;
}

/* Hamburger动画 — 打开状态 */
#mobile-menu-btn.active .hamburger-line:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

#mobile-menu-btn.active .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: translateX(-10px);
}

#mobile-menu-btn.active .hamburger-line:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
  width: 1.5rem;
}

/* ---------------------------------------------------------
   8. 全局悬浮栏样式
--------------------------------------------------------- */
#floating-bar.visible {
  opacity: 1;
  transform: translateX(0);
  pointer-events: auto;
}

/* 微信弹窗 */
#wechat-float-popup.visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
  pointer-events: auto;
}

/* ---------------------------------------------------------
   9. 科技感装饰效果
--------------------------------------------------------- */

/* 光球背景 — 大尺寸模糊光效 */
.deco-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.2;
}

.deco-orb-sm {
  width: 200px;
  height: 200px;
}

.deco-orb-md {
  width: 400px;
  height: 400px;
}

.deco-orb-lg {
  width: 600px;
  height: 600px;
}

/* 渐变线装饰 */
.deco-gradient-line {
  position: relative;
}

.deco-gradient-line::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--color-border), transparent);
}

/* 网格背景 */
.deco-grid {
  background-image:
    linear-gradient(rgba(30, 41, 59, 0.3) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30, 41, 59, 0.3) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* 闪烁点 */
.deco-dot-pulse {
  position: relative;
}

.deco-dot-pulse::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 6px;
  height: 6px;
  background-color: var(--color-neon);
  border-radius: 50%;
  animation: dotPulse 2s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.4);
  }
  50% {
    box-shadow: 0 0 0 10px rgba(34, 211, 238, 0);
  }
}

/* 科技感边框动画 */
.deco-border-animate {
  position: relative;
  overflow: hidden;
}

.deco-border-animate::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, var(--color-cyan), var(--color-blue), var(--color-purple), var(--color-cyan));
  background-size: 400% 400%;
  border-radius: inherit;
  z-index: -1;
  animation: borderGradient 6s ease infinite;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.deco-border-animate:hover::before {
  opacity: 1;
}

@keyframes borderGradient {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* ---------------------------------------------------------
   10. 响应式断点覆写
--------------------------------------------------------- */

/* 小屏幕：手机竖屏 */
@media (max-width: 639px) {
  :root {
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
    --spacing-3xl: 3rem;
  }

  .u-card-dark:hover {
    transform: none;
  }

  .deco-orb-md,
  .deco-orb-lg {
    width: 200px;
    height: 200px;
    filter: blur(60px);
  }
}

/* 中等屏幕：平板 */
@media (min-width: 640px) and (max-width: 1023px) {
  .deco-orb-lg {
    width: 400px;
    height: 400px;
  }
}

/* 大屏幕 */
@media (min-width: 1024px) {
  /* 桌面端特有样式 */
}

/* ---------------------------------------------------------
   11. AOS动画覆写（暗色主题适配）
--------------------------------------------------------- */

/* AOS基础覆写 */
[data-aos] {
  pointer-events: none;
}

[data-aos].aos-animate {
  pointer-events: auto;
}

/* 延迟梯度 */
[data-aos-delay="100"] { transition-delay: 100ms !important; }
[data-aos-delay="200"] { transition-delay: 200ms !important; }
[data-aos-delay="300"] { transition-delay: 300ms !important; }
[data-aos-delay="400"] { transition-delay: 400ms !important; }
[data-aos-delay="500"] { transition-delay: 500ms !important; }

/* 暗色主题下fade效果增强 */
[data-aos="fade-up"] {
  opacity: 0;
  transform: translateY(30px);
  transition-property: opacity, transform;
}

[data-aos="fade-up"].aos-animate {
  opacity: 1;
  transform: translateY(0);
}

[data-aos="fade-right"] {
  opacity: 0;
  transform: translateX(-30px);
  transition-property: opacity, transform;
}

[data-aos="fade-right"].aos-animate {
  opacity: 1;
  transform: translateX(0);
}

[data-aos="fade-left"] {
  opacity: 0;
  transform: translateX(30px);
  transition-property: opacity, transform;
}

[data-aos="fade-left"].aos-animate {
  opacity: 1;
  transform: translateX(0);
}

[data-aos="zoom-in"] {
  opacity: 0;
  transform: scale(0.9);
  transition-property: opacity, transform;
}

[data-aos="zoom-in"].aos-animate {
  opacity: 1;
  transform: scale(1);
}

/* ---------------------------------------------------------
   12. Swiper样式定制
--------------------------------------------------------- */

/* Swiper容器 */
.swiper {
  width: 100%;
  overflow: hidden;
}

/* Swiper分页器 — 暗色主题 */
.swiper-pagination-bullet {
  width: 8px;
  height: 8px;
  background-color: var(--color-dim);
  opacity: 1;
  transition: all var(--transition-normal);
}

.swiper-pagination-bullet-active {
  background-color: var(--color-cyan);
  width: 24px;
  border-radius: 4px;
  box-shadow: 0 0 10px rgba(6, 182, 212, 0.4);
}

/* Swiper导航箭头 */
.swiper-button-prev,
.swiper-button-next {
  width: 44px;
  height: 44px;
  background-color: rgba(17, 24, 39, 0.8);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-light);
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.swiper-button-prev:hover,
.swiper-button-next:hover {
  border-color: var(--color-cyan);
  color: var(--color-cyan);
  box-shadow: var(--shadow-glow-cyan);
}

.swiper-button-prev::after,
.swiper-button-next::after {
  font-size: 16px;
  font-weight: 700;
}

/* Swiper滚动条 */
.swiper-scrollbar {
  background-color: var(--color-border);
  border-radius: 2px;
}

.swiper-scrollbar-drag {
  background: linear-gradient(to right, var(--color-cyan), var(--color-blue));
  border-radius: 2px;
}

/* ---------------------------------------------------------
   13. 数字增长动画
--------------------------------------------------------- */
.counter-number {
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
}

/* ---------------------------------------------------------
   14. 表单样式增强
--------------------------------------------------------- */

/* 输入框暗色主题 */
.form-input-dark {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  color: var(--color-light);
  font-size: 0.9375rem;
  transition: all var(--transition-normal);
  min-height: 44px;
}

.form-input-dark::placeholder {
  color: var(--color-dim);
}

.form-input-dark:focus {
  outline: none;
  border-color: var(--color-cyan);
  box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
}

.form-input-dark:hover {
  border-color: var(--color-dim);
}

/* 表单标签 */
.form-label-dark {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-muted);
}

/* 表单错误 */
.form-error {
  color: #f87171;
  font-size: 0.8125rem;
  margin-top: 0.375rem;
  display: none;
}

.form-input-dark.error {
  border-color: #f87171;
}

.form-input-dark.error + .form-error {
  display: block;
}

/* ---------------------------------------------------------
   15. 加载动画
--------------------------------------------------------- */
.u-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-cyan);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* 骨架屏 */
.u-skeleton {
  background: linear-gradient(
    90deg,
    var(--color-card) 25%,
    var(--color-border) 50%,
    var(--color-card) 75%
  );
  background-size: 200% 100%;
  animation: skeleton 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---------------------------------------------------------
   16. 工具类补充
--------------------------------------------------------- */

/* 文字截断 */
.u-truncate-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.u-truncate-3 {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 毛玻璃 */
.u-glass {
  background: rgba(17, 24, 39, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(30, 41, 59, 0.5);
}

/* 无障碍：仅屏幕阅读器可见 */
.u-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* 焦点可见 */
:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 2px;
}

/* 移除默认焦点（仅鼠标） */
:focus:not(:focus-visible) {
  outline: none;
}