/* ========== 1.5 产品介绍模块样式 ========== */
.product-intro {
  padding: 60px 40px;
  background: linear-gradient(135deg, #f0f7ff 0%, #e6f2ff 100%);
  border-bottom: 3px solid #2989d8;
  }
.product-intro .section-title {
  color: #1e5799;
  margin-bottom: 30px;
  }
.product-intro .section-title::after {
  background: linear-gradient(90deg, #1e5799, #2989d8);
  }
.product-info-box {
  background: #fff;
  border-radius: 15px;
  padding: 40px;
  box-shadow: 0 10px 40px rgba(30, 87, 153, 0.15);
  border: 2px solid #e1e8f0;
 }
.product-name {
  font-size: 32px;
  color: #1e5799;
  font-weight: 700;
  margin-bottom: 25px;
  display: flex;
  align-items: center;
  }
.product-name::before {
  content: '🏆';
  margin-right: 15px;
  font-size: 36px;
  }
.product-features {
  background: linear-gradient(135deg, #f8fbff 0%, #eef5fc 100%);
  border-radius: 12px;
  padding: 30px;
  border-left: 5px solid #2989d8;
  }
.product-features h3 {
  color: #1e5799;
  font-size: 22px;
  margin-bottom: 20px;
  font-weight: 600;
  }
.feature-list {
  list-style: none;
  }
.feature-list li {
  padding: 12px 0;
  padding-left: 30px;
  position: relative;
  color: #555;
  line-height: 1.8;
  font-size: 15px;
  }
.feature-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: #28a745;
  font-weight: bold;
  font-size: 18px;
  }
.erp-systems {
  color: #2989d8;
  font-weight: 600;
  background: #eef5fc;
  padding: 2px 8px;
  border-radius: 4px;
  }
/* 下载按钮样式 */
.download-btn-group {
  display: flex;
  gap: 15px;
  margin-top: 30px;
  flex-wrap: wrap;
  }
.download-btn {
  display: inline-flex;
  align-items: center;
  padding: 15px 35px;
  background: linear-gradient(135deg, #27ae60, #1e8449);
  color: #fff;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.3s ease;
  box-shadow: 0 5px 20px rgba(39, 174, 96, 0.4);
  }
.download-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(39, 174, 96, 0.6);
  }
.download-btn svg {
  width: 20px;
  height: 20px;
  margin-right: 10px;
  }
.download-btn.secondary {
  background: linear-gradient(135deg, #1e5799, #2989d8);
  box-shadow: 0 5px 20px rgba(30, 87, 153, 0.4);
  }
.download-btn.secondary:hover {
  box-shadow: 0 8px 30px rgba(30, 87, 153, 0.6);
  }
.download-btn.orange {
  background: linear-gradient(135deg, #ff6b35, #e74c3c);
  box-shadow: 0 5px 20px rgba(255, 107, 53, 0.4);
  }
.download-btn.orange:hover {
  box-shadow: 0 8px 30px rgba(255, 107, 53, 0.6);
  }
/* 悬浮下载按钮 */
.float-download {
  position: fixed;
  right: 20px;
  bottom: 100px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  }
.float-download .download-btn {
  padding: 12px 25px;
  font-size: 14px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
  }
.float-download .download-btn:hover {
  transform: scale(1.05);
  }
  
/* 移动端适配 */
@media (max-width: 768px) {
.product-intro {
  padding: 40px 20px;
  }
.product-info-box {
  padding: 25px 20px;
  }
.product-name {
  font-size: 24px;
  }
.product-features {
  padding: 20px;
  }
.feature-list li {
  font-size: 14px;
  }
.download-btn-group {
  flex-direction: column;
  }
.download-btn {
  width: 75%;
  justify-content: center;
  }
.float-download {
  right: 10px;
  bottom: 130px;
  }
.float-download .download-btn {
  padding: 10px 20px;
  font-size: 12px;
  }
}

.container {
    max-width: 1198px;
    margin: 0 auto;
    background: #fff;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.1);
}

/* ========== 2. 头部 Banner 区域 ========== */
.header-banner {
    background: linear-gradient(135deg, #1e5799 0%, #2989d8 50%, #7db9e8 100%);
    padding: 60px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.header-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    animation: pulse 4s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}
.header-banner h1 {
    color: #fff;
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    position: relative;
    z-index: 1;
}
.header-banner p {
    color: #e8f4fd;
    font-size: 18px;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}
.header-tag {
    display: inline-block;
    background: #ff6b35;
    color: #fff;
    padding: 8px 20px;
    border-radius: 25px;
    font-size: 14px;
    margin-top: 20px;
    font-weight: 600;
    position: relative;
    z-index: 1;
}

/* ========== 3. 通用区块样式 ========== */
.section {
    padding: 50px 40px;
    background: #fff;
}
.section-title {
    text-align: center;
    font-size: 32px;
    color: #1e5799;
    margin-bottom: 40px;
    font-weight: 700;
    position: relative;
}
.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #1e5799, #2989d8);
    margin: 15px auto 0;
    border-radius: 2px;
}

/* ========== 4. 系统支持区域 ========== */
.support-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 30px;
}
.support-card {
    background: linear-gradient(145deg, #f8f9fa, #e9ecef);
    padding: 30px;
    border-radius: 12px;
    border-left: 5px solid #2989d8;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}
.support-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(41, 137, 216, 0.2);
}
.support-card h3 {
    color: #1e5799;
    margin-bottom: 15px;
    font-size: 20px;
}
.support-card ul {
    list-style: none;
}
.support-card li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    color: #555;
}
.support-card li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

/* ========== 5. 发票类型区域 ========== */
.invoice-types {
    padding: 50px 40px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e6f2ff 100%);
}
.type-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}
.type-item {
    background: #fff;
    padding: 20px 15px;
    border-radius: 10px;
    text-align: center;
    border: 2px solid #e1e8f0;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
}
.type-item:hover {
    border-color: #2989d8;
    background: linear-gradient(135deg, #eef5fc 0%, #d9e8f7 100%);
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(30, 87, 153, 0.2);
}
.type-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, #ff6b35, #e74c3c);
    color: #fff;
    border-radius: 50%;
    font-size: 14px;
    font-weight: 700;
    margin-right: 10px;
    flex-shrink: 0;
    box-shadow: 0 3px 10px rgba(255, 107, 53, 0.4);
    border: 2px solid #fff;
}
.type-item span {
    color: #333;
    font-size: 14px;
    font-weight: 600;
}

/* ========== 6. 核心优势区域 ========== */
.core-advantages {
    padding: 50px 40px;
    background: #fff;
}
.advantage-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}
.advantage-card {
    background: linear-gradient(145deg, #f8fbff 0%, #eef5fc 100%);
    border-radius: 12px;
    padding: 30px 25px;
    text-align: center;
    border: 2px solid #e1e8f0;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}
.advantage-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(30, 87, 153, 0.2);
    border-color: #2989d8;
}
.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #1e5799, #2989d8, #7db9e8);
}
.advantage-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, #1e5799, #2989d8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 32px;
    color: #fff;
}
.advantage-card h3 {
    color: #1e5799;
    font-size: 20px;
    margin-bottom: 12px;
    font-weight: 600;
}
.advantage-card p {
    color: #666;
    font-size: 14px;
    line-height: 1.8;
}
.advantage-number {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 48px;
    font-weight: 900;
    color: rgba(30, 87, 153, 0.08);
}

/* ========== 7. 软件著作权区域 ========== */
.copyrights {
    padding: 50px 40px;
    background: #fff;
}
.copyright-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}
.copyright-card {
    background: linear-gradient(145deg, #f8fbff 0%, #eef5fc 100%);
    border-radius: 12px;
    padding: 50px 25px;
    text-align: center;
    border: 2px solid #e1e8f0;
    transition: all 0.3s ease;
    position: relative;
    overflow: visible;
    cursor: pointer;
}
.copyright-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(30, 87, 153, 0.2);
    border-color: #2989d8;
}
.copyright-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #1e5799, #2989d8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 40px;
    color: #fff !important;
}
.copyright-card h4 {
    color: #1e5799;
    font-size: 17px;
    margin-bottom: 10px;
    font-weight: 600;
}
.copyright-card p {
    color: #888;
    font-size: 13px;
    line-height: 1.6;
    margin-bottom: 8px;
}
.copyright-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    background: linear-gradient(135deg, #27ae60, #1e8449);
    color: #fff;
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 12px;
    font-weight: 600;
    box-shadow: 0 3px 10px rgba(39, 174, 96, 0.4);
}
.copyright-certify {
    color: #27ae60;
    margin-top: 12px;
    font-weight: 600;
    font-size: 13px;
    display: block;
}
.copyright-view-tip {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: #2989d8;
    font-size: 13px;
    font-weight: 600;
    opacity: 0;
    transition: all 0.3s ease;
    margin-top: 15px;
}
.copyright-card:hover .copyright-view-tip {
    opacity: 1;
    bottom: 25px;
}

/* ========== 8. 软著证书弹出层 ========== */
.copyright-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    backdrop-filter: blur(5px);
}
.copyright-modal.active {
    display: flex;
    animation: modalFadeIn 0.3s ease;
}
@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
.modal-content {
    background: #fff;
    border-radius: 15px;
    max-width: 800px;
    width: 90%;
    max-height: 80vh;
    overflow: auto;
    position: relative;
    animation: modalSlideIn 0.3s ease;
}
@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}
.modal-header {
    background: linear-gradient(135deg, #1e5799, #2989d8);
    color: #fff;
    padding: 20px 30px;
    border-radius: 15px 15px 0 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.modal-header h3 {
    font-size: 20px;
    color: #fff !important;
}
.modal-close {
    width: 35px;
    height: 35px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}
.modal-close:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: rotate(90deg);
}
.modal-body {
    padding: 30px;
}
.certificate-preview {
    border: 3px solid #e1e8f0;
    border-radius: 10px;
    padding: 20px;
    background: #f8fbff;
    text-align: center;
}
.certificate-placeholder {
    width: 100%;
    height: 500px;
    background: linear-gradient(135deg, #f0f5fb 0%, #e1e8f0 100%);
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: #1e5799;
}
.certificate-placeholder-icon {
    font-size: 80px;
    margin-bottom: 20px;
}
.certificate-placeholder p {
    font-size: 16px;
    font-weight: 600;
}
.certificate-info {
    margin-top: 25px;
    text-align: left;
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    border: 1px solid #e1e8f0;
}
.certificate-info-row {
    display: flex;
    margin-bottom: 12px;
    font-size: 14px;
}
.certificate-info-row:last-child {
    margin-bottom: 0;
}
.certificate-info-label {
    width: 100px;
    color: #888;
    font-weight: 600;
    flex-shrink: 0;
}
.certificate-info-value {
    color: #333;
    font-weight: 600;
}
.modal-footer {
    padding: 20px 30px;
    border-top: 1px solid #e1e8f0;
    text-align: center;
}
.modal-btn {
    display: inline-block;
    padding: 12px 35px;
    background: linear-gradient(135deg, #1e5799, #2989d8);
    color: #fff;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    margin: 0 10px;
}
.modal-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(30, 87, 153, 0.4);
}
.modal-btn.secondary {
    background: #f0f5fb;
    color: #1e5799;
}
.modal-btn.secondary:hover {
    background: #e1e8f0;
}

/* ========== 9. 视频展示区域 ========== */
.video-section {
    background: linear-gradient(135deg, #1e5799 0%, #2989d8 100%);
    padding: 60px 40px;
    text-align: center;
}
.video-section .section-title {
    color: #fff;
}
.video-section .section-title::after {
    background: linear-gradient(90deg, #fff, #7db9e8);
}
.video-container {
    max-width: 900px;
    margin: 0 auto;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    position: relative;
}
.video-placeholder {
    width: 100%;
    height: 500px;
    background: linear-gradient(135deg, #2c3e50 0%, #34495e 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
}
.video-container video {
    width: 100%;
    height: auto;
    display: block;
}
.video-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.6) 0%, rgba(0, 0, 0, 0.4) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: opacity 0.3s ease;
    z-index: 10;
}
.video-overlay:hover {
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.5) 0%, rgba(0, 0, 0, 0.3) 100%);
}
.video-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}
.play-btn-wrapper {
    text-align: center;
    transform: scale(1);
    transition: transform 0.3s ease;
}
.video-overlay:hover .play-btn-wrapper {
    transform: scale(1.1);
}
.play-btn {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
    animation: pulseBtn 2s infinite;
}
.play-btn svg {
    width: 35px;
    height: 35px;
    color: #fff;
    margin-left: 5px;
}
.play-hint {
    color: #fff;
    font-size: 16px;
    font-weight: 500;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    margin: 0;
}
@keyframes pulseBtn {
    0% { box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.7); }
    70% { box-shadow: 0 0 0 20px rgba(102, 126, 234, 0); }
    100% { box-shadow: 0 0 0 0 rgba(102, 126, 234, 0); }
}
.play-btn-paused {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 5;
    transition: opacity 0.3s ease;
}
.play-btn-paused svg {
    width: 28px;
    height: 28px;
    color: #fff;
    margin-left: 3px;
}
.play-btn-paused:hover {
    background: rgba(0, 0, 0, 0.9);
    transform: translate(-50%, -50%) scale(1.1);
}
.video-caption {
    color: #fff;
    margin-top: 20px;
    font-size: 16px;
    opacity: 0.9;
}

/* ========== 10. 痛点区域 ========== */
.pain-points {
    padding: 50px 40px;
    background: linear-gradient(135deg, #fff5f5 0%, #ffe8e8 100%);
    border-top: 3px solid #ff6b35;
    border-bottom: 3px solid #ff6b35;
}
.pain-points .section-title {
    color: #c0392b;
}
.pain-points .section-title::after {
    background: linear-gradient(90deg, #c0392b, #e74c3c);
}
.pain-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}
.pain-item {
    background: #fff;
    border-radius: 10px;
    padding: 25px;
    display: flex;
    align-items: flex-start;
    box-shadow: 0 4px 15px rgba(192, 57, 43, 0.1);
    transition: all 0.3s ease;
}
.pain-item:hover {
    transform: translateX(10px);
    box-shadow: 0 8px 25px rgba(192, 57, 43, 0.2);
}
.pain-icon {
    width: 45px;
    height: 45px;
    background: #ffe0e0;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-right: 20px;
    flex-shrink: 0;
    font-size: 24px;
}
.pain-content h4 {
    color: #c0392b;
    font-size: 17px;
    margin-bottom: 8px;
    font-weight: 600;
}
.pain-content p {
    color: #666;
    font-size: 14px;
    line-height: 1.7;
}

/* ========== 11. 功能特点区域 ========== */
.features {
    padding: 50px 40px;
    background: #fff;
}
.feature-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 35px;
    justify-content: center;
}
.feature-tab {
    padding: 15px 35px;
    background: #f0f5fb;
    border: 2px solid #e1e8f0;
    border-radius: 30px;
    cursor: pointer;
    font-size: 16px;
    color: #666;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}
.feature-tab:hover {
    background: #e1e8f0;
    border-color: #1e5799;
    color: #1e5799;
}
.feature-tab.active {
    background: linear-gradient(135deg, #1e5799, #2989d8);
    color: #fff;
    border-color: #1e5799;
    box-shadow: 0 5px 20px rgba(30, 87, 153, 0.4);
    transform: scale(1.05);
}
.feature-tab.active::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 8px solid transparent;
    border-right: 8px solid transparent;
    border-top: 8px solid #1e5799;
}
.feature-tab-icon {
    display: inline-block;
    margin-right: 8px;
    font-size: 18px;
}
.feature-content {
    display: none;
    animation: fadeInUp 0.5s ease;
}
.feature-content.active {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
.feature-item {
    background: linear-gradient(135deg, #f8fbff 0%, #eef5fc 100%);
    border-left: 5px solid #2989d8;
    padding: 22px 20px;
    border-radius: 0 10px 10px 0;
    transition: all 0.3s ease;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}
.feature-item:hover {
    background: linear-gradient(135deg, #eef5fc 0%, #d9e8f7 100%);
    transform: translateX(8px);
    box-shadow: 0 5px 20px rgba(30, 87, 153, 0.15);
    border-left-width: 8px;
}
.feature-item h4 {
    color: #1e5799;
    font-size: 17px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    font-weight: 600;
}
.feature-item h4::before {
    content: '✓';
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: linear-gradient(135deg, #2989d8, #1e5799);
    color: #fff;
    border-radius: 50%;
    font-size: 13px;
    margin-right: 12px;
    font-weight: 700;
    flex-shrink: 0;
}
.feature-item p {
    color: #555;
    font-size: 14px;
    line-height: 1.8;
    padding-left: 36px;
}
.feature-content[data-category="all"] .feature-item { border-left-color: #1e5799; }
.feature-content[data-category="all"] .feature-item h4::before { background: linear-gradient(135deg, #1e5799, #2989d8); }
.feature-content[data-category="batch"] .feature-item { border-left-color: #2989d8; }
.feature-content[data-category="batch"] .feature-item h4::before { background: linear-gradient(135deg, #2989d8, #1e5799); }
.feature-content[data-category="smart"] .feature-item { border-left-color: #27ae60; }
.feature-content[data-category="smart"] .feature-item h4::before { background: linear-gradient(135deg, #27ae60, #1e8449); }
.feature-content[data-category="erp"] .feature-item { border-left-color: #8e44ad; }
.feature-content[data-category="erp"] .feature-item h4::before { background: linear-gradient(135deg, #8e44ad, #6c3483); }
.feature-content[data-category="manage"] .feature-item { border-left-color: #e67e22; }
.feature-content[data-category="manage"] .feature-item h4::before { background: linear-gradient(135deg, #e67e22, #d35400); }

/* ========== 12. 客户案例区域 ========== */
.cases {
    padding: 50px 40px;
    background: #fff;
}
.case-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}
.case-card {
    background: linear-gradient(145deg, #f8fbff 0%, #eef5fc 100%);
    border-radius: 12px;
    padding: 30px;
    border: 2px solid #e1e8f0;
    transition: all 0.3s ease;
}
.case-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(30, 87, 153, 0.15);
    border-color: #2989d8;
}
.case-logo {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #1e5799, #2989d8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 36px;
    color: #fff;
    font-weight: 700;
}
.case-card h4 {
    color: #1e5799;
    font-size: 18px;
    margin-bottom: 12px;
}
.case-card p {
    color: #666;
    font-size: 13px;
    line-height: 1.8;
    margin-bottom: 15px;
}
.case-stats {
    display: flex;
    justify-content: space-between;
    padding-top: 15px;
    border-top: 1px dashed #d0d8e0;
}
.stat-item {
    text-align: center;
}
.stat-value {
    font-size: 24px;
    font-weight: 700;
    color: #2989d8;
}
.stat-label {
    font-size: 12px;
    color: #888;
}

/* ========== 13. FAQ 问答区域 ========== */
.faq {
    padding: 50px 40px;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
}
.faq-list {
    max-width: 900px;
    margin: 0 auto;
}
.faq-item {
    background: #fff;
    border-radius: 10px;
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: 0 3px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}
.faq-item:hover {
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}
.faq-question {
    padding: 25px 30px;
    background: linear-gradient(135deg, #1e5799 0%, #2989d8 100%);
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}
.faq-question:hover {
    background: linear-gradient(135deg, #2989d8 0%, #1e5799 100%);
}
.faq-question::after {
    content: '−';
    font-size: 24px;
    font-weight: 300;
    transition: all 0.3s ease;
}
.faq-item .faq-question::after {
    content: '−';
}
.faq-item.collapsed .faq-question::after {
    content: '+';
}
.faq-answer {
    max-height: 500px;
    overflow: hidden;
    transition: all 0.4s ease;
    background: #fff;
    padding: 25px 30px;
}
.faq-item.collapsed .faq-answer {
    max-height: 0;
    padding: 0 30px;
}
.faq-answer {
    color: #666;
    line-height: 1.8;
    font-size: 14px;
}
.faq-answer strong {
    color: #1e5799;
}
.faq-controls {
    text-align: center;
    margin-bottom: 30px;
}
.faq-toggle-btn {
    display: inline-block;
    padding: 10px 25px;
    background: linear-gradient(135deg, #1e5799, #2989d8);
    color: #fff;
    border: none;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 0 10px;
}
.faq-toggle-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 20px rgba(30, 87, 153, 0.4);
}
.faq-toggle-btn.secondary {
    background: #f0f5fb;
    color: #1e5799;
}
.faq-toggle-btn.secondary:hover {
    background: #e1e8f0;
}

/* ========== 14. 联系方式区域 ========== */
.contact157 {
    padding: 50px 40px;
    background: linear-gradient(135deg, #1e5799 0%, #2989d8 50%, #7db9e8 100%);
    text-align: center;
}
.contact157 .section-title {
    color: #fff;
}
.contact157 .section-title::after {
    background: #fff;
}
.contact157-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
    max-width: 900px;
    margin: 0 auto;
}
.contact157-item {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    padding: 30px 20px;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
    border: 2px solid rgba(255, 255, 255, 0.2);
}
.contact157-item:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.4);
}
.contact157-icon {
    width: 60px;
    height: 60px;
    background: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
    font-size: 28px;
    color: #1e5799;
}
.contact157-item h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 8px;
}
.contact157-item p {
    color: #e8f4fd;
    font-size: 18px;
    font-weight: 700;
}
.qr-popup {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-10px);
    background: #fff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 1000;
    min-width: 180px;
}
.contact157-item:hover .qr-popup {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-15px);
}
.qr-popup img {
    width: 150px;
    height: 150px;
    display: block;
    margin: 0 auto;
}
.qr-popup p {
    color: #333;
    font-size: 13px;
    margin-top: 12px;
    font-weight: 500;
    text-align: center;
}
.qr-placeholder {
    width: 150px;
    height: 150px;
    background: linear-gradient(135deg, #f0f5fb 0%, #e1e8f0 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    color: #1e5799;
    font-size: 12px;
}

/* ========== 15. 底部 CTA 区域 ========== */
.cta-bar {
    background: linear-gradient(135deg, #ff6b35, #e74c3c);
    padding: 30px 40px;
    text-align: center;
}
.cta-bar p {
    color: #fff;
    font-size: 18px;
    margin-bottom: 20px;
    font-weight: 600;
}
.cta-button {
    display: inline-block;
    background: #fff;
    color: #ff6b35;
    padding: 18px 60px;
    border-radius: 35px;
    font-size: 20px;
    font-weight: 700;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.3);
}
.cta-button:hover {
    transform: scale(1.08);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

/* ========== 16. 图片响应式 ========== */
img {
    max-width: 100%;
    height: auto;
}
.certificate-placeholder img,
.qr-popup img {
    max-width: 100%;
}

/* ========== 17. SEO 优化内容 (隐藏) ========== */
.seo-content {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ==================== 移动端适配样式 ==================== */
/* 平板端 (992px 以下) */
@media (max-width: 992px) {
    .advantage-grid,
    .case-grid,
    .copyright-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .type-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .contact157-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .feature-content.active {
        grid-template-columns: 1fr;
    }
}

/* 手机端 (768px 以下) */
@media (max-width: 768px) {
    .container {
        width: 100%;
    }
    .header-banner,
    .core-advantages,
    .pain-points,
    .features,
    .invoice-types,
    .cases,
    .faq,
    .copyrights,
    .contact157,
    .video-section,
    .cta-bar,
    .section {
        padding-left: 20px;
        padding-right: 20px;
    }
    .advantage-grid,
    .pain-grid,
    .case-grid,
    .type-grid,
    .copyright-grid,
    .contact157-grid {
        grid-template-columns: 1fr;
    }
    .header-banner h1 {
        font-size: 28px;
        padding: 0 10px;
    }
    .header-banner p {
        font-size: 15px;
    }
    .section-title {
        font-size: 24px;
        padding: 0 10px;
    }
    .advantage-card h3,
    .case-card h4 {
        font-size: 17px;
    }
    .advantage-card p,
    .pain-content p,
    .feature-item p {
        font-size: 13px;
        line-height: 1.7;
    }
    .feature-tabs {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 10px;
        justify-content: flex-start;
    }
    .feature-tab {
        flex-shrink: 0;
        padding: 12px 25px;
        font-size: 14px;
        white-space: nowrap;
    }
    .video-section {
        padding: 40px 20px;
    }
    .video-container {
        margin: 0 10px;
    }
    .video-container video {
        height: auto;
    }
    .play-btn {
        width: 60px;
        height: 60px;
    }
    .play-btn svg {
        width: 28px;
        height: 28px;
    }
    .play-hint {
        font-size: 14px;
    }
    .qr-popup {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
    }
    .contact157-item:hover .qr-popup {
        opacity: 0;
        visibility: hidden;
    }
    .contact157-item.show-qr .qr-popup {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(-15px);
    }
    .faq-question {
        padding: 20px;
        font-size: 15px;
    }
    .faq-answer {
        padding: 20px;
        font-size: 13px;
    }
    .faq-toggle-btn {
        padding: 8px 20px;
        font-size: 13px;
        margin: 5px;
    }
    .cta-bar {
        padding: 25px 20px;
    }
    .cta-bar p {
        font-size: 16px;
        margin-bottom: 15px;
    }
    .cta-button {
        padding: 15px 40px;
        font-size: 16px;
        display: block;
        width: 100%;
        max-width: 300px;
        margin: 0 auto;
    }
    .modal-content {
        width: 95%;
        max-height: 90vh;
    }
    .modal-header {
        padding: 15px 20px;
        background: linear-gradient(135deg, #1e5799, #2989d8) !important;
        color: #fff !important;
    }
    .modal-header h3 {
        font-size: 16px;
        color: #fff !important;
    }
    .modal-close {
        background: rgba(255, 255, 255, 0.2) !important;
        color: #fff !important;
    }
    .modal-body {
        padding: 20px 15px;
    }
    .certificate-placeholder {
        height: 400px;
    }
    .modal-btn {
        padding: 10px 25px;
        font-size: 14px;
        display: block;
        margin: 10px auto;
        width: 80%;
    }
    .support-grid {
        grid-template-columns: 1fr;
    }
    .support-card {
        padding: 25px 20px;
    }
    .support-card h3 {
        font-size: 18px;
    }
    .support-card li {
        font-size: 14px;
    }
    /* 【修复】著作权图标颜色 - 手机端强制保持白色 */
    .copyright-icon {
        color: #fff !important;
        background: linear-gradient(135deg, #1e5799, #2989d8) !important;
    }
}

/* 小屏手机 (576px 以下) */
@media (max-width: 576px) {
    .header-banner {
        padding: 40px 15px;
    }
    .header-banner h1 {
        font-size: 24px;
    }
    .header-banner p {
        font-size: 14px;
    }
    .section-title {
        font-size: 20px;
    }
    .advantage-card,
    .pain-item,
    .case-card,
    .contact157-item {
        padding: 20px 15px;
    }
    .copyright-card {
        padding: 50px 15px;
    }
    .type-item {
        padding: 15px 10px;
    }
    .type-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .advantage-card:hover,
    .pain-item:hover,
    .feature-item:hover,
    .case-card:hover,
    .copyright-card:hover,
    .contact157-item:hover,
    .support-card:hover {
        transform: none;
    }
    .feature-tab,
    .faq-question,
    .copyright-card,
    .contact157-item,
    .cta-button,
    .modal-btn,
    .faq-toggle-btn {
        min-height: 44px;
    }
}

/* ========== 下载按钮基础样式 ========== */
.download-btn {
    display: inline-flex;
    align-items: center;
    padding: 15px 35px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

/* 强制文字和图标为白色 */
.download-btn,
.download-btn:link,
.download-btn:visited,
.download-btn:hover,
.download-btn:active,
.download-btn:focus {
    color: #ffffff !important;
}

.download-btn svg {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    fill: #ffffff !important;
}

/* ========== 绿色按钮（下载试用版、下载使用）========== */
.download-btn {
    background: linear-gradient(135deg, #27ae60, #1e8449);
    box-shadow: 0 5px 20px rgba(39, 174, 96, 0.4);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(39, 174, 96, 0.6);
}

/* ========== 蓝色按钮（下载产品手册）========== */
.download-btn.secondary {
    background: linear-gradient(135deg, #1e5799, #2989d8);
    box-shadow: 0 5px 20px rgba(30, 87, 153, 0.4);
}

.download-btn.secondary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(30, 87, 153, 0.6);
}

/* ========== 橙色按钮（免费咨询报价、在线咨询）========== */
.download-btn.orange {
    background: linear-gradient(135deg, #ff6b35, #e74c3c);
    box-shadow: 0 5px 20px rgba(255, 107, 53, 0.4);
}

.download-btn.orange:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.6);
}

/* ========== 悬浮下载按钮 ========== */
.float-download {
    position: fixed;
    right: 20px;
    bottom: 120px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.float-download .download-btn {
    padding: 12px 25px;
    font-size: 14px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.float-download .download-btn:hover {
    transform: scale(1.05);
}