/* ============================================
   正晔网红财税官网 - 公共样式系统
   配色：主色#C8161D中国红 + 黑灰白中性色
   风格：高级感 + 科技感 + 商务感
============================================ */

:root {
  /* 品牌主色 - 中国红 */
  --color-primary: #C8161D;
  --color-primary-dark: #A50F16;
  --color-primary-light: #E63E45;
  --color-primary-bg: #FDECEC;
  --color-primary-50: #FFF5F5;

  /* 中性色 */
  --color-black: #0A0A0A;
  --color-gray-900: #1A1A1A;
  --color-gray-800: #2D2D2D;
  --color-gray-700: #4A4A4A;
  --color-gray-600: #666666;
  --color-gray-500: #888888;
  --color-gray-400: #B8B8B8;
  --color-gray-300: #D9D9D9;
  --color-gray-200: #E8E8E8;
  --color-gray-100: #F5F5F5;
  --color-white: #FFFFFF;

  /* 渐变 */
  --gradient-red: linear-gradient(135deg, #C8161D 0%, #A50F16 100%);
  --gradient-red-light: linear-gradient(135deg, #E63E45 0%, #C8161D 100%);
  --gradient-dark: linear-gradient(135deg, #1A1A1A 0%, #0A0A0A 100%);

  /* 阴影 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.12);
  --shadow-red: 0 8px 24px rgba(200, 22, 29, 0.24);

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* 间距 */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;
  --space-32: 128px;

  /* 字号 */
  --text-xs: 12px;
  --text-sm: 14px;
  --text-base: 16px;
  --text-lg: 18px;
  --text-xl: 20px;
  --text-2xl: 24px;
  --text-3xl: 30px;
  --text-4xl: 36px;
  --text-5xl: 48px;
  --text-6xl: 60px;
  --text-7xl: 72px;

  /* 容器 */
  --container-max: 1280px;
  --container-pad: 24px;

  /* 过渡 */
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

/* ===== Reset ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
               "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-gray-800);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-fast);
}

a:hover {
  color: var(--color-primary);
}

ul, ol {
  list-style: none;
}

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

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
  background: none;
}

/* ===== 工具类 ===== */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

.text-primary { color: var(--color-primary); }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.font-medium { font-weight: 500; }

/* ===== 顶部导航 ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: var(--transition-base);
}

.header.scrolled {
  border-bottom-color: var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  text-decoration: none;
}

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

@media (max-width: 768px) {
  .logo-img { height: 36px; }
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--gradient-red);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  font-size: 18px;
  font-weight: 900;
  box-shadow: var(--shadow-red);
  letter-spacing: -1px;
}

.logo-text {
  font-size: var(--text-lg);
  color: var(--color-gray-900);
  letter-spacing: 0.5px;
}

.logo-text small {
  display: block;
  font-size: 10px;
  color: var(--color-gray-500);
  font-weight: 400;
  letter-spacing: 1.5px;
  margin-top: 2px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
  display: flex;
  align-items: center;
}

.nav a,
.nav-parent {
  position: relative;
  padding: 8px 18px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-700);
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  line-height: 1.1;
  border: 0;
  background: transparent;
  cursor: default;
  font-family: inherit;
}
.nav a .nav-zh,
.nav-parent .nav-zh {
  font-size: 14px;
  font-weight: 600;
}
.nav a .nav-en,
.nav-parent .nav-en {
  font-size: 9px;
  font-weight: 500;
  letter-spacing: 1.5px;
  color: var(--color-gray-500);
  text-transform: uppercase;
  font-family: 'Inter', 'Helvetica Neue', Arial, sans-serif;
}
.nav a:hover,
.nav-parent:hover,
.nav-parent:focus-visible {
  color: var(--color-primary);
  background: var(--color-primary-bg);
}

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 12px);
  left: 50%;
  width: 260px;
  padding: 10px;
  background: rgba(26, 26, 26, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.22);
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, 8px);
  transition: var(--transition-base);
}

.has-dropdown:hover .nav-dropdown-menu,
.has-dropdown:focus-within .nav-dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

.nav-dropdown-menu a {
  display: block;
  padding: 14px 16px;
  color: rgba(255, 255, 255, 0.88);
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
}

.nav-dropdown-menu a:hover {
  color: var(--color-white);
  background: var(--gradient-red);
}
.nav a:hover .nav-en,
.nav-parent:hover .nav-en,
.nav-parent:focus-visible .nav-en {
  color: var(--color-primary);
  opacity: 0.7;
}

.nav a:hover,
.nav-parent:hover,
.nav-parent:focus-visible {
  color: var(--color-primary);
  background: var(--color-primary-bg);
}

.nav a.active,
.nav-parent.active {
  color: var(--color-primary);
  font-weight: 600;
}
.nav a.active .nav-en,
.nav-parent.active .nav-en {
  color: var(--color-primary);
  opacity: 0.75;
}

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

.nav a.header-cta {
  position: relative;
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  overflow: hidden;
  padding: 11px 22px 11px 24px;
  border: 1px solid rgba(255, 255, 255, 0.52);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.18) 0%, rgba(255, 255, 255, 0) 36%),
    linear-gradient(135deg, #D71920 0%, #B20E16 58%, #8F0C12 100%);
  color: var(--color-white);
  border-radius: 12px;
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow:
    0 14px 32px rgba(200, 22, 29, 0.28),
    0 0 0 7px rgba(200, 22, 29, 0.08);
  transition: transform 0.24s ease, box-shadow 0.24s ease, filter 0.24s ease;
}

.nav a.header-cta::before {
  content: '';
  position: absolute;
  inset: 1px;
  pointer-events: none;
  border-radius: 10px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0));
  transform: translateX(-105%);
  transition: transform 0.55s ease;
}

.nav a.header-cta::after {
  content: '→';
  position: static;
  width: auto;
  height: auto;
  transform: none;
  background: none;
  border-radius: 0;
  color: rgba(255, 255, 255, 0.92);
  font-size: 15px;
  line-height: 1;
  transition: transform 0.24s ease;
}

.nav a.header-cta:hover,
.nav a.header-cta:focus-visible {
  transform: translateY(-2px);
  filter: saturate(1.05);
  box-shadow:
    0 18px 38px rgba(200, 22, 29, 0.34),
    0 0 0 8px rgba(200, 22, 29, 0.11);
  color: var(--color-white);
}

.nav a.header-cta:hover::before,
.nav a.header-cta:focus-visible::before {
  transform: translateX(105%);
}

.nav a.header-cta:hover::after,
.nav a.header-cta:focus-visible::after {
  transform: translateX(2px);
}

.mobile-toggle {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
}

.mobile-toggle span {
  width: 20px;
  height: 2px;
  background: var(--color-gray-900);
  position: relative;
}

.mobile-toggle span::before,
.mobile-toggle span::after {
  content: '';
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--color-gray-900);
}

.mobile-toggle span::before { top: -6px; }
.mobile-toggle span::after { top: 6px; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: var(--transition-base);
  white-space: nowrap;
  cursor: pointer;
}

.btn-primary {
  background: var(--gradient-red);
  color: var(--color-white);
  box-shadow: var(--shadow-red);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(200, 22, 29, 0.4);
  color: var(--color-white);
}

.btn-outline {
  background: transparent;
  color: var(--color-gray-900);
  border: 1.5px solid var(--color-gray-300);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-ghost {
  background: var(--color-primary-bg);
  color: var(--color-primary);
}

.btn-ghost:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

.btn-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary);
  font-weight: 600;
  font-size: var(--text-sm);
  transition: var(--transition-fast);
}

.btn-arrow::after {
  content: '→';
  transition: var(--transition-fast);
}

.btn-arrow:hover {
  gap: 10px;
}

/* ===== Section通用 ===== */
.section {
  padding: var(--space-24) 0;
}

.section-sm {
  padding: var(--space-16) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-4);
  letter-spacing: 1px;
}

.section-title {
  font-size: var(--text-5xl);
  font-weight: 800;
  color: var(--color-gray-900);
  line-height: 1.2;
  letter-spacing: -0.5px;
  margin-bottom: var(--space-4);
}

.section-title .accent {
  color: var(--color-primary);
  position: relative;
}

.section-subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
  max-width: 720px;
  margin: 0 auto;
  line-height: 1.7;
}

.section-subtitle strong {
  color: var(--color-primary);
  font-weight: 600;
}

.section-title-en {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-gray-400);
  letter-spacing: 4px;
  margin-top: 8px;
  text-transform: uppercase;
}

/* ===== 卡片 ===== */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: var(--transition-base);
  border: 1px solid var(--color-gray-200);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

/* ===== 装饰元素 ===== */
.deco-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(200, 22, 29, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 22, 29, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

.deco-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(200, 22, 29, 0.15) 0%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
}

/* ===== 数字标识 ===== */
.num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: var(--color-primary-bg);
  color: var(--color-primary);
  border-radius: var(--radius-md);
  font-weight: 700;
  font-size: var(--text-base);
}

.num-badge.dark {
  background: var(--color-gray-900);
  color: var(--color-white);
}

/* ===== 底部 ===== */
.footer {
  background: var(--color-gray-900);
  color: var(--color-gray-400);
  padding: var(--space-20) 0 var(--space-8);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-red);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.footer-brand h3 {
  color: var(--color-white);
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.8;
  color: var(--color-gray-400);
}

.footer h4 {
  color: var(--color-white);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-5);
}

.footer ul li {
  margin-bottom: var(--space-3);
}

.footer ul li a {
  font-size: var(--text-sm);
  color: var(--color-gray-400);
  transition: var(--transition-fast);
}

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

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.footer-contact-item {
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-contact-item .ico {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(200, 22, 29, 0.15);
  color: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  flex-shrink: 0;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: var(--space-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

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

/* ===== 动画 ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes rotate {
  from { transform: rotate(0); }
  to { transform: rotate(360deg); }
}

@keyframes drawLine {
  from { stroke-dashoffset: 1000; }
  to { stroke-dashoffset: 0; }
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  :root {
    --text-5xl: 36px;
    --text-6xl: 48px;
    --text-7xl: 56px;
  }
  .section { padding: var(--space-16) 0; }
  .nav a { padding: 8px 12px; font-size: 13px; }
  .nav a .nav-zh { font-size: 13px; }
  .nav a .nav-en { font-size: 8px; letter-spacing: 1.2px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  :root {
    --text-5xl: 30px;
    --text-6xl: 38px;
    --text-7xl: 42px;
    --space-24: 64px;
    --space-20: 48px;
  }
  .nav { display: none; }
  .nav.nav-open {
    display: flex;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    flex-direction: column;
    padding: 16px;
    background: var(--color-white);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.12);
    gap: 4px;
  }
  .nav-item {
    display: block;
    width: 100%;
  }
  .nav-item > a,
  .nav-item > .nav-parent {
    width: 100%;
  }
  .nav-dropdown-menu {
    position: static;
    width: 100%;
    margin: 4px 0 10px;
    padding: 8px;
    opacity: 1;
    visibility: visible;
    transform: none;
    background: var(--color-gray-100);
    border: 1px solid var(--color-gray-200);
    box-shadow: none;
  }
  .nav-dropdown-menu a {
    color: var(--color-gray-700);
    padding: 10px 14px;
  }
  .nav-dropdown-menu a:hover {
    color: var(--color-primary);
    background: var(--color-primary-bg);
  }
  .mobile-toggle { display: flex; }
  .header-cta { display: none; }
  .section-title { font-size: var(--text-4xl); }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-8); }
  .footer-bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
}