/* ============================================
   国家电网投标工具站点 · 基础样式
   ============================================ */

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

html {
  font-size: var(--font-size-body);
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-body);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

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

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

/* 容器 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* 区块间距 */
.section {
  padding: var(--spacing-xl) 0;
}

/* 内容区背景框（撑满 container，与无背景模块等宽） */
.section-bg {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin: 0 calc(-1 * var(--spacing-md));
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-h2);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-body);
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: var(--font-size-body);
  font-weight: 500;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  line-height: 1.5;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.btn-accent:hover {
  background-color: #e55a2b;
  color: var(--color-white);
  transform: translateY(-1px);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

.btn-lg {
  padding: 16px 36px;
  font-size: 18px;
}

/* 卡片 */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

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

/* 网格 */
.grid {
  display: grid;
  gap: var(--spacing-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Flex */
.flex {
  display: flex;
  gap: var(--spacing-md);
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ============================================
   轮播 Banner
   ============================================ */
.banner {
  background: linear-gradient(135deg, #007B3E 0%, #005a2e 50%, #003d1f 100%);
  overflow: hidden;
  position: relative;
}

.banner-wrapper {
  max-width: var(--max-width);
  margin: 0 auto;
  position: relative;
  overflow: hidden;
}

.banner-track {
  display: flex;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  will-change: transform;
}

.banner-slide {
  min-width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 60px 120px;
  gap: 60px;
}

.banner-content {
  flex: 1;
  max-width: 560px;
}

.banner-tag {
  display: inline-block;
  background: rgba(255, 255, 255, 0.15);
  color: #fff;
  padding: 4px 16px;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 16px;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.banner-tag-accent {
  background: rgba(255, 107, 53, 0.25);
  border-color: rgba(255, 107, 53, 0.4);
}

.banner-slide h1 {
  color: #fff;
  font-size: 40px;
  line-height: 1.25;
  margin-bottom: 16px;
  font-weight: 700;
}

.banner .banner-subtitle {
  color: rgba(255, 255, 255, 0.85);
  font-size: 18px;
  margin-bottom: 12px;
}

.banner .banner-desc {
  color: rgba(255, 255, 255, 0.7);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 28px;
}

.banner-btns {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.banner-btns .btn-outline {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.5);
}

.banner-btns .btn-outline:hover {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
}

.banner-visual {
  flex: 0 0 320px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.banner-icon-wrap svg {
  width: 260px;
  height: 260px;
  filter: drop-shadow(0 8px 32px rgba(0, 0, 0, 0.2));
}

/* Banner 特性列表（Slide 3） */
.banner-features {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 28px;
}

.banner-feature {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 16px;
}

.banner-feature .bf-icon {
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  flex-shrink: 0;
}

/* 轮播圆点 */
.banner-dots {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding-bottom: 24px;
}

.banner-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  padding: 0;
}

.banner-dots .dot.active {
  background: #fff;
  width: 28px;
  border-radius: 5px;
}

/* 轮播箭头 */
.banner-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: #fff;
  font-size: 24px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
  z-index: 10;
}

.banner-arrow:hover {
  background: rgba(255, 255, 255, 0.3);
}

.banner-prev { left: 48px; }
.banner-next { right: 48px; }

/* ============================================
   痛点卡片（升级版）
   ============================================ */
.pain-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--color-error);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.pain-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.pain-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
}

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

/* 四色变体 */
.pain-card--red {
  border-left-color: #D93026;
}
.pain-card--red::before {
  background: linear-gradient(90deg, #D93026, #ff6b6b);
}
.pain-card--red:hover {
  box-shadow: 0 8px 30px rgba(217, 48, 38, 0.12);
}

.pain-card--orange {
  border-left-color: #E65100;
}
.pain-card--orange::before {
  background: linear-gradient(90deg, #E65100, #FF9800);
}
.pain-card--orange:hover {
  box-shadow: 0 8px 30px rgba(230, 81, 0, 0.12);
}

.pain-card--purple {
  border-left-color: #7B2D8E;
}
.pain-card--purple::before {
  background: linear-gradient(90deg, #7B2D8E, #BA68C8);
}
.pain-card--purple:hover {
  box-shadow: 0 8px 30px rgba(123, 45, 142, 0.12);
}

.pain-card--blue {
  border-left-color: #0369A1;
}
.pain-card--blue::before {
  background: linear-gradient(90deg, #0369A1, #38BDF8);
}
.pain-card--blue:hover {
  box-shadow: 0 8px 30px rgba(3, 105, 161, 0.12);
}

.pain-icon {
  width: 52px;
  height: 52px;
  margin-bottom: var(--spacing-sm);
}

.pain-icon svg {
  width: 100%;
  height: 100%;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.pain-card:hover .pain-icon svg {
  transform: scale(1.15) rotate(-8deg);
}

.pain-card .title {
  font-size: var(--font-size-h3);
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-text);
}

.pain-card .desc {
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  line-height: 1.6;
  margin-bottom: 12px;
}

.pain-tag {
  display: inline-block;
  padding: 3px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.5px;
}

.pain-card--red .pain-tag {
  background: #FEE2E2;
  color: #D93026;
}

.pain-card--orange .pain-tag {
  background: #FFF3E0;
  color: #E65100;
}

.pain-card--purple .pain-tag {
  background: #F3E8FF;
  color: #7B2D8E;
}

.pain-card--blue .pain-tag {
  background: #E0F2FE;
  color: #0369A1;
}

/* 价值卡片 */
.value-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-card);
  text-align: center;
  transition: var(--transition);
}

.value-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.value-card .icon {
  width: 56px;
  height: 56px;
  background: var(--color-primary-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-sm);
  font-size: 24px;
}

.value-card .title {
  font-size: var(--font-size-h3);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
}

/* Hero 区 */
.hero {
  background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-white) 100%);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero h1 {
  font-size: var(--font-size-h1);
  margin-bottom: var(--spacing-sm);
}

.hero .subtitle {
  font-size: var(--font-size-h3);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.hero .desc {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto var(--spacing-lg);
}

.hero .btn-group {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* FAQ 手风琴 */
.faq-item {
  background: var(--color-white);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-xs);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.faq-question {
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-question:hover {
  background: var(--color-primary-light);
}

.faq-answer {
  padding: 0 var(--spacing-md);
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
  max-height: 500px;
  padding: 0 var(--spacing-md) var(--spacing-sm);
}

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

.arrow {
  transition: transform 0.3s ease;
  font-size: 12px;
}

/* 下载区 */
.download-section {
  background: var(--color-white);
  text-align: center;
}

.download-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
}

.download-card .version {
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  margin-bottom: var(--spacing-sm);
}

.download-card .features {
  text-align: left;
  max-width: 400px;
  margin: var(--spacing-sm) auto;
}

.download-card .features li {
  list-style: none;
  padding: 4px 0;
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
}

.download-card .features li::before {
  content: "✓ ";
  color: var(--color-success);
  font-weight: bold;
}

/* 页头 */
.header {
  background: var(--color-white);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.header .logo {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-primary);
}

.header nav {
  display: flex;
  gap: var(--spacing-md);
}

.header nav a {
  color: var(--color-text);
  font-size: var(--font-size-small);
  font-weight: 500;
}

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

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--color-text);
}

/* 页脚 */
.footer {
  background: var(--color-text);
  color: rgba(255, 255, 255, 0.7);
  padding: var(--spacing-lg) 0;
  text-align: center;
  font-size: var(--font-size-small);
}

.footer a {
  color: rgba(255, 255, 255, 0.9);
}

.footer a:hover {
  color: var(--color-white);
}

.footer .links {
  margin-bottom: var(--spacing-sm);
}

.footer .links a {
  margin: 0 var(--spacing-xs);
}

/* 交叉推荐 */
.cross-recommend {
  background: var(--color-primary-light);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
}

.cross-recommend h3 {
  margin-bottom: var(--spacing-xs);
}

.cross-recommend p {
  margin-bottom: var(--spacing-sm);
}

/* 表单 */
.form-group {
  margin-bottom: var(--spacing-sm);
}

.form-group label {
  display: block;
  margin-bottom: 4px;
  font-weight: 500;
  font-size: var(--font-size-small);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  font-size: var(--font-size-body);
  font-family: var(--font-family);
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 123, 62, 0.1);
}

/* 工具类 */
.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-accent { color: var(--color-accent); }
.text-secondary { color: var(--color-text-secondary); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ============================================
   购买页 / 支付 / 弹窗
   ============================================ */
.price-line {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 14px;
  margin: 8px 0 4px;
}

.price-original {
  color: var(--color-text-secondary);
  font-size: 20px;
  text-decoration: line-through;
}

.price-now {
  color: var(--color-accent);
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
}

.price-badge {
  background: var(--color-accent);
  color: #fff;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 12px;
  font-weight: 500;
}

.buy-box {
  max-width: 460px;
  margin: 0 auto;
}

.buy-box label {
  display: block;
  font-size: var(--font-size-small);
  margin-bottom: 6px;
  color: var(--color-text-secondary);
}

.buy-box input[type="tel"] {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-body);
  margin-bottom: 14px;
}

.btn-block {
  display: block;
  width: 100%;
  text-align: center;
}

.pay-panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  background: var(--color-bg);
  text-align: center;
}

.pay-qr-wrap {
  margin: var(--spacing-md) auto;
}

.pay-qr-wrap img {
  width: 220px;
  height: 220px;
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px;
}

.pay-qr-fallback {
  width: 220px;
  min-height: 120px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--color-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
}

.pay-tip {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
}

.pay-status {
  margin-top: 10px;
  font-size: var(--font-size-small);
  color: var(--color-primary);
  font-weight: 500;
}

.recover-form {
  display: flex;
  gap: 10px;
  max-width: 560px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.recover-form input {
  flex: 1;
  min-width: 140px;
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.recover-result {
  max-width: 560px;
  margin: var(--spacing-md) auto 0;
  text-align: center;
}

/* 弹窗 */
.modal-mask {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
}

.modal {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  max-width: 420px;
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.modal h3 {
  margin-bottom: 10px;
}

/* 保证 hidden 属性始终生效（防止作者样式 display 覆盖 UA 的 [hidden] 规则） */
[hidden] {
  display: none !important;
}

/* 终身使用价值条 */
.lifetime-strip {
  margin-top: var(--spacing-md);
  background: linear-gradient(90deg, var(--color-primary-light), #fff);
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.lifetime-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.lifetime-text strong {
  font-size: var(--font-size-h3);
  color: var(--color-primary);
}

.lifetime-price {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lifetime-price .price-now {
  font-size: 32px;
}