/* ============================================
   美股智选 - Homepage Styles
   Design System & Layout
   ============================================ */

/* CSS Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 颜色系统 */
  --color-bg-primary: #F5F5F5;
  --color-bg-white: #FFFFFF;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #666666;
  --color-text-tertiary: #999999;
  --color-text-white: #FFFFFF;
  --color-purple-primary: #8B5CF6;
  --color-purple-light: #A78BFA;
  --color-purple-dark: #7C3AED;
  --color-pink-accent: #EC4899;
  --color-blue-accent: #3B82F6;
  --color-border-divider: #D1D1D1;
  --color-black-primary: #1A1A1A;
  --color-black-button: #2D2D2D;
  --color-card-bg: #FFFFFF;
  --color-card-bg-dark: #1A1A2E;
  --color-gradient-start: #8B5CF6;
  --color-gradient-end: #EC4899;
  --color-card-purple: #2D1B69;
  --color-card-purple-mid: #4C1D95;
  
  /* 字体系统 */
  --font-family-primary: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* 字号系统 */
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-md: 18px;
  --font-size-lg: 24px;
  --font-size-xl: 32px;
  --font-size-2xl: 40px;
  --font-size-3xl: 48px;
  --font-size-hero: 56px;
  --font-size-hero-large: 64px;
  
  /* 字重系统 */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* 行高系统 */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.6;
  --line-height-loose: 1.8;
  
  /* 间距系统 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 80px;
  --spacing-5xl: 96px;
  
  /* 圆角系统 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* 阴影系统 */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.16);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
  
  /* 过渡动画 */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* 布局尺寸 */
  --max-width: 1440px;
  --content-width: 1178px;
  --header-height: 78px;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family-primary);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 背景装饰色块 */
.bg-decoration {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.3;
  pointer-events: none;
  z-index: 0;
}

.bg-decoration--1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--color-purple-primary) 0%, transparent 70%);
  top: -200px;
  left: -200px;
}

.bg-decoration--2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-pink-accent) 0%, transparent 70%);
  top: 400px;
  right: -150px;
}

.bg-decoration--3 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--color-blue-accent) 0%, transparent 70%);
  top: 800px;
  left: 100px;
}

.bg-decoration--4 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--color-purple-light) 0%, transparent 70%);
  bottom: 200px;
  right: -100px;
}

.bg-decoration--5 {
  width: 450px;
  height: 450px;
  background: radial-gradient(circle, var(--color-pink-accent) 0%, transparent 70%);
  bottom: -100px;
  left: -100px;
}

/* 主容器 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  position: relative;
  z-index: 1;
}

/* ============================================
   Header 区域
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  transform: translateY(-100%);
  opacity: 0;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

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

.header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  letter-spacing: 0.02em;
}

.header__logo span {
  color: var(--color-purple-primary);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.header__nav-link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

.header__nav-link:hover {
  color: var(--color-purple-primary);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
  min-height: 380px;
  display: flex;
  align-items: center;
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.hero__content {
  flex: 1;
  max-width: 600px;
}

.hero__title-brand {
  font-size: var(--font-size-hero-large);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-purple-primary) 0%, var(--color-pink-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
  letter-spacing: -0.02em;
}

.hero__title-main {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  letter-spacing: -0.02em;
}

.hero__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 520px;
}

.hero__action {
  flex-shrink: 0;
  margin-left: var(--spacing-3xl);
}

/* 按钮样式 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family-primary);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
  white-space: nowrap;
}

.btn--primary {
  background-color: var(--color-black-button);
  color: var(--color-text-white);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  position: relative;
  z-index: 1;
}

.btn--primary::before {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: calc(var(--radius-full) + 4px);
  background: linear-gradient(135deg, var(--color-purple-primary) 0%, var(--color-blue-accent) 50%, var(--color-pink-accent) 100%);
  z-index: -1;
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--secondary {
  background-color: var(--color-black-button);
  color: var(--color-text-white);
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-md);
}

.btn--secondary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--outline {
  background: transparent;
  color: var(--color-text-white);
  border: 2px solid rgba(255, 255, 255, 0.3);
  padding: var(--spacing-md) var(--spacing-xl);
}

.btn--outline:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

.btn--gradient-border {
  background-color: var(--color-black-button);
  color: var(--color-text-white);
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-base);
  position: relative;
  z-index: 1;
}

.btn--gradient-border::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: calc(var(--radius-full) + 3px);
  background: linear-gradient(135deg, var(--color-purple-primary) 0%, var(--color-blue-accent) 50%, var(--color-pink-accent) 100%);
  z-index: -1;
}

.btn--gradient-border:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--contact {
  background-color: var(--color-black-button);
  color: var(--color-text-white);
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-md);
  position: relative;
  z-index: 1;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.btn--contact::before {
  content: '';
  position: absolute;
  inset: -3px;
  border-radius: calc(var(--radius-full) + 3px);
  background: linear-gradient(135deg, var(--color-purple-primary) 0%, var(--color-blue-accent) 50%, var(--color-pink-accent) 100%);
  z-index: -1;
}

.btn--contact:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn__arrow {
  margin-left: var(--spacing-sm);
  font-size: 1.1em;
}

/* ============================================
   通用区块样式
   ============================================ */
.section {
  padding: var(--spacing-4xl) 0;
  position: relative;
  z-index: 1;
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.section__header {
  margin-bottom: var(--spacing-xl);
}

.section__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.01em;
}

.section__title-highlight {
  background: linear-gradient(135deg, var(--color-purple-primary) 0%, var(--color-pink-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section__subtitle {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 800px;
}

/* ============================================
   专家团队区域
   ============================================ */
.experts {
  padding: var(--spacing-3xl) 0 var(--spacing-4xl);
}

.experts__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.experts__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 1100px;
}

/* ============================================
   量化交易Plus大模型 区域
   ============================================ */
.quant-model {
  padding: var(--spacing-3xl) 0 var(--spacing-4xl);
}

.quant-model__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.quant-model__title-highlight {
  color: var(--color-purple-primary);
}

.quant-model__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 1100px;
  margin-bottom: var(--spacing-xl);
}

/* Tab 容器 */
.quant-model__card {
  background-color: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.quant-model__tabs {
  display: inline-flex;
  background-color: var(--color-black-button);
  border-radius: var(--radius-sm);
  padding: 4px;
  margin-bottom: var(--spacing-lg);
}

.quant-model__tab {
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-white);
  background: transparent;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-family-primary);
  white-space: nowrap;
}

.quant-model__tab--active {
  background-color: var(--color-bg-white);
  color: var(--color-text-primary);
}

.quant-model__tab:hover:not(.quant-model__tab--active) {
  color: var(--color-text-white);
  opacity: 0.8;
}

/* 内容展示区域 */
.quant-model__content {
  display: grid;
  grid-template-columns: 30% 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.quant-model__content-left {
  max-width: 340px;
}

.quant-model__content-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.quant-model__content-subtitle {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.quant-model__content-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.quant-model__content-right {
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
}

.quant-model__image {
  width: 100%;
  max-width: 873px;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
  background-color: #8B4513;
}

/* 量化模型按钮容器 */
.quant-model__action {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-xl);
}

/* ============================================
   AI量化交易实盘PUSH 区域
   ============================================ */
.ai-push {
  padding: var(--spacing-4xl) 0;
}

.ai-push__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-md);
}

.ai-push__title-highlight {
  background: linear-gradient(135deg, var(--color-purple-primary) 0%, var(--color-pink-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.ai-push__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 1100px;
  margin-bottom: var(--spacing-xl);
}

/* 卡片容器 */
.ai-push__cards {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.ai-push__card {
  background-color: var(--color-card-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

.ai-push__card--row {
  display: grid;
  grid-template-columns: 30% 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.ai-push__card--row-full {
  display: grid;
  grid-template-columns: 30% 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.ai-push__card-left {
  max-width: 340px;
}

.ai-push__card-right {
  display: flex;
  justify-content: flex-start;
  align-items: flex-start;
}

.ai-push__card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.ai-push__card-subtitle {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.ai-push__card-desc {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

/* 股票卡片滑动容器 */
.ai-push__slider {
  display: flex;
  gap: var(--spacing-md);
  overflow-x: auto;
  padding-bottom: var(--spacing-md);
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none; /* IE 10+ */
  width: 100%;
}

.ai-push__slider::-webkit-scrollbar {
  display: none; /* Chrome Safari */
}

/* 股票卡片 */
.stock-card {
  min-width: 280px;
  flex-shrink: 0;
  background: linear-gradient(135deg, var(--color-card-purple) 0%, var(--color-card-purple-mid) 100%);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  color: var(--color-text-white);
  scroll-snap-align: start;
}

.stock-card__header {
  margin-bottom: var(--spacing-md);
}

.stock-card__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 2px;
}

.stock-card__subtitle {
  font-size: var(--font-size-xs);
  opacity: 0.7;
  margin-bottom: 4px;
}

.stock-card__date {
  font-size: var(--font-size-xs);
  opacity: 0.6;
}

.stock-card__items {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.stock-card__item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.stock-card__item:last-child {
  border-bottom: none;
}

.stock-card__item-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.stock-card__item-icon {
  width: 20px;
  height: 20px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: var(--font-weight-bold);
}

.stock-card__item-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

.stock-card__item-code {
  font-size: var(--font-size-xs);
  opacity: 0.6;
}

.stock-card__item-right {
  text-align: right;
}

.stock-card__item-price {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
}

.stock-card__item-label {
  font-size: var(--font-size-xs);
  opacity: 0.6;
}

/* 图片占位 */
.ai-push__image {
  width: 100%;
  max-width: 873px;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-md);
/*  background-color: #8B4513; */
}

/* AI Push按钮容器 */
.ai-push__action {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-xl);
}

/* ============================================
   联系我们区域
   ============================================ */
.contact {
  padding: var(--spacing-4xl) 0;
  text-align: center;
}

.contact__title-brand {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--color-purple-primary) 0%, var(--color-blue-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-xs);
}

.contact__title-main {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.contact__title-highlight {
  color: var(--color-purple-primary);
}

.contact__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

.contact__action {
  display: flex;
  justify-content: center;
}

/* ============================================
   Footer 区域
   ============================================ */
.footer {
  border-top: 1px solid var(--color-border-divider);
  padding: var(--spacing-xl) 0;
  position: relative;
  z-index: 1;
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.footer__left {
  max-width: 800px;
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.footer__risk {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-sm);
}

.footer__disclaimer {
  font-size: 11px;
  color: var(--color-text-tertiary);
  line-height: var(--line-height-relaxed);
}

.footer__right {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  flex-shrink: 0;
}

.footer__link {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-purple-primary);
}

.footer__separator {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
}

/* ============================================
   模态框（浮层）
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

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

.modal {
  background-color: var(--color-bg-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  max-width: 480px;
  width: 90%;
  box-shadow: var(--shadow-xl);
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition-normal);
  position: relative;
}

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

.modal__close {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text-tertiary);
  font-size: 20px;
  transition: color var(--transition-fast);
}

.modal__close:hover {
  color: var(--color-text-primary);
}

.modal__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.modal__content {
  text-align: center;
}

.modal__text {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--spacing-lg);
}

.modal__form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.modal__input {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-family: var(--font-family-primary);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition-fast);
  outline: none;
}

.modal__input:focus {
  border-color: var(--color-purple-primary);
}

.modal__input::placeholder {
  color: var(--color-text-tertiary);
}

.modal__submit {
  width: 100%;
  padding: var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family-primary);
  background: linear-gradient(135deg, var(--color-purple-primary) 0%, var(--color-pink-accent) 100%);
  color: var(--color-text-white);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.modal__submit:hover {
  opacity: 0.9;
}

/* 价格浮层特殊样式 */
.modal--pricing {
  max-width: 720px;
}

.modal--pricing .modal__plans {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* 价格表格 */
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.pricing-table__header {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  background-color: #1A1A3E;
  color: var(--color-text-white);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.pricing-table__row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

.pricing-table__row--subheader {
  background-color: #2A2A5E;
  color: var(--color-text-white);
  font-weight: var(--font-weight-medium);
}

.pricing-table__row--price {
  background-color: rgba(139, 92, 246, 0.08);
}

.pricing-table__cell {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 56px;
}

.pricing-table__cell--label {
  align-items: flex-start;
  text-align: left;
  padding-left: var(--spacing-lg);
}

.pricing-table__cell--free {
  background-color: rgba(0, 0, 0, 0.03);
}

.pricing-table__cell--paid {
  grid-column: span 3;
  font-weight: var(--font-weight-semibold);
}

.pricing-table__cell--check {
  color: var(--color-purple-primary);
  font-size: 18px;
  font-weight: var(--font-weight-bold);
}

.pricing-table__cell--cross {
  color: var(--color-text-tertiary);
  font-size: 16px;
}

.pricing-table__badge {
  background: linear-gradient(135deg, var(--color-purple-primary), var(--color-pink-accent));
  padding: 4px 16px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-white);
}

.pricing-table__price-usd {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.pricing-table__price-cny {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-top: 2px;
}

.pricing-table__feature-name {
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  margin-bottom: 2px;
}

.pricing-table__feature-desc {
  font-size: var(--font-size-xs);
  color: var(--color-text-tertiary);
}

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

/* Tablet: 1024px */
@media (max-width: 1024px) {
  :root {
    --font-size-hero: 48px;
    --font-size-hero-large: 52px;
    --font-size-xl: 28px;
  }
  
  .hero__inner {
    flex-direction: column;
    text-align: center;
  }
  
  .hero__content {
    max-width: 100%;
    margin-bottom: var(--spacing-xl);
  }
  
  .hero__description {
    max-width: 100%;
  }
  
  .hero__action {
    margin-left: 0;
  }
  
  .quant-model__content {
    grid-template-columns: 1fr;
  }
  
  .quant-model__image {
    width: 100%;
    height: auto;
    aspect-ratio: 751/514;
  }
  
  .ai-push__card--row {
    grid-template-columns: 1fr;
  }
  
  .ai-push__card--row-full {
    grid-template-columns: 1fr;
  }
  
  .ai-push__image {
    width: 100%;
    height: auto;
    aspect-ratio: 751/488;
  }
  
  .footer__inner {
    flex-direction: column;
    gap: var(--spacing-lg);
  }
  
  .footer__right {
    align-self: flex-start;
  }
}

/* Mobile: 768px */
@media (max-width: 768px) {
  :root {
    --font-size-hero: 36px;
    --font-size-hero-large: 40px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --spacing-4xl: 48px;
    --spacing-5xl: 64px;
  }
  
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .section__inner {
    padding: 0 var(--spacing-md);
  }
  
  .header__inner {
    padding: 0 var(--spacing-md);
  }
  
  .header__nav {
    gap: var(--spacing-md);
  }
  
  .header__nav-link {
    font-size: var(--font-size-xs);
  }
  
  .hero {
    min-height: auto;
    padding: var(--spacing-4xl) 0;
  }
  
  .hero__title-brand {
    font-size: var(--font-size-hero-large);
  }
  
  .hero__title-main {
    font-size: var(--font-size-hero);
  }
  
  .quant-model__tabs {
    display: flex;
    width: 100%;
  }
  
  .quant-model__tab {
    flex: 1;
    text-align: center;
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .quant-model__content-left {
    padding: 0;
  }
  
  .stock-card {
    min-width: 260px;
  }
  
  /* 价格浮层移动端优化 */
  .modal--pricing {
    max-width: 95%;
    padding: var(--spacing-lg);
  }
  
  .pricing-table {
    font-size: var(--font-size-xs);
  }
  
  .pricing-table__header,
  .pricing-table__row {
    grid-template-columns: 1.5fr 0.8fr 0.8fr 0.8fr 0.8fr;
  }
  
  .pricing-table__cell {
    padding: var(--spacing-sm) var(--spacing-xs);
    min-height: 48px;
  }
  
  .pricing-table__cell--label {
    padding-left: var(--spacing-sm);
  }
  
  .pricing-table__price-usd {
    font-size: var(--font-size-sm);
  }
  
  .pricing-table__price-cny {
    font-size: 10px;
  }
  
  .pricing-table__feature-name {
    font-size: var(--font-size-xs);
  }
  
  .pricing-table__feature-desc {
    font-size: 10px;
  }
  
  .pricing-table__badge {
    font-size: 10px;
    padding: 2px 10px;
  }
  
  .bg-decoration {
    display: none;
  }
  
  .footer__disclaimer {
    font-size: 10px;
  }
}

/* Mobile Small: 480px */
@media (max-width: 480px) {
  :root {
    --font-size-hero: 28px;
    --font-size-hero-large: 32px;
    --font-size-xl: 20px;
    --font-size-2xl: 26px;
  }
  
  .header__nav {
    display: none;
  }
  
  .hero__description {
    font-size: var(--font-size-sm);
  }
  
  .section__subtitle {
    font-size: var(--font-size-sm);
  }
  
  .quant-model__description {
    font-size: var(--font-size-sm);
  }
  
  .ai-push__description {
    font-size: var(--font-size-sm);
  }
  
  .contact__description {
    font-size: var(--font-size-sm);
  }
  
  .btn--primary,
  .btn--secondary,
  .btn--contact,
  .btn--gradient-border {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-sm);
  }
  
  /* 价格浮层小屏幕优化 */
  .modal--pricing {
    max-width: 98%;
    padding: var(--spacing-md);
  }
  
  .pricing-table__header,
  .pricing-table__row {
    grid-template-columns: 1.2fr 0.7fr 0.7fr 0.7fr 0.7fr;
  }
  
  .pricing-table__cell {
    padding: var(--spacing-xs) 2px;
    min-height: 44px;
  }
  
  .pricing-table__cell--label {
    padding-left: 4px;
  }
  
  .pricing-table__price-usd {
    font-size: var(--font-size-xs);
  }
  
  .pricing-table__price-cny {
    font-size: 9px;
  }
  
  .pricing-table__feature-name {
    font-size: 11px;
  }
  
  .pricing-table__feature-desc {
    display: none;
  }
  
  .pricing-table__badge {
    font-size: 9px;
    padding: 2px 8px;
  }
}