:root {
    /* 品牌色：青色科技风（对标 qing.tv） */
    --primary-color: #00c8d4;
    --primary-hover: #00a8b4;
    --primary-highlight: #00e5f5;
    --brand-gradient: linear-gradient(135deg, #00c8d4 0%, #0080ff 100%);
    --brand-glow: 0 0 24px rgba(0,200,212,0.35);

    /* 亮色主题（保留兼容） */
    --text-color-light: #1a1a2e;
    --bg-color-light: #f0f4f8;
    --card-bg-light: #ffffff;
    --border-color-light: #d8e0ea;

    /* 深色主题：深空黑 */
    --text-color-dark: #e8edf5;
    --bg-color-dark: #070b14;
    --card-bg-dark: #0d1525;
    --border-color-dark: rgba(0,200,212,0.15);
    --card-bg-dark2: #111a2e;

    --font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --ease-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --transition-base: 0.3s var(--ease-expo);
}

html {
    scroll-behavior: smooth
}

body {
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    padding-top: 70px
}

[data-theme="light"] body {
    background-color: var(--bg-color-light);
    color: var(--text-color-light)
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 700;
    margin-top: 0;
    margin-bottom: 0.75rem
}

h1 {
    font-size: 3rem
}

h2 {
    font-size: 2.25rem
}

h3 {
    font-size: 1.5rem
}

p {
    margin-bottom: 1rem
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.2s ease
}


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

.section {
    padding: 70px 0;
    background-color: var(--bg-color-dark);
}

[data-theme="light"] .section {
    background-color: var(--bg-color-light);
}

/* 奇偶交替微妙区分 */
#features, #faq {
    background-color: #060a12;
}

[data-theme="light"] #features, [data-theme="light"] #faq {
    background-color: var(--card-bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--primary-color);
    font-weight: 900;
    letter-spacing: -0.01em;
}

[data-theme="light"] .section-title {
    color: var(--primary-color)
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    text-align: center;
    border: 2px solid transparent;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease
}

.btn i {
    margin-right: 8px
}

.btn-large {
    padding: 15px 30px;
    font-size: 1.15rem
}

.btn-primary {
    background: var(--brand-gradient);
    color: #ffffff;
    border-color: transparent;
    box-shadow: 0 0 20px rgba(0,200,212,0.3);
}


.btn-primary:active {
    background-color: #004494;
    border-color: #004494;
    color: #ffffff;
    transform: translateY(0);
    box-shadow: none
}

.btn-secondary {
    background-color: transparent;
    color: #ffffff;
    border-color: #ffffff
}


.btn-secondary:active {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(0);
    box-shadow: none
}

.btn-back {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--card-bg-dark);
    color: var(--text-color-dark);
    border: 1px solid var(--border-color-dark);
    cursor: pointer;
    transition: all 0.2s ease
}

[data-theme="light"] .btn-back {
    background-color: var(--card-bg-light);
    color: var(--text-color-light);
    border-color: var(--border-color-light)
}


.btn-back:active {
    background-color: var(--primary-hover);
    color: white;
    border-color: var(--primary-hover);
    transform: translateY(0)
}

.header {
    background-color: rgba(7,11,20,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(0,200,212,0.12);
    padding: 10px 0;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color 0.3s, box-shadow 0.3s
}

[data-theme="light"] .header {
    background-color: rgba(255,255,255,0.92);
    box-shadow: 0 1px 0 rgba(0,0,0,0.08);
}

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

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-color-dark)
}

[data-theme="light"] .logo {
    color: var(--text-color-light)
}

.logo img {
    height: 50px;
    margin-right: 10px
}

.logo .title {
    font-size: 1.3rem;
    font-weight: 600
}

.theme-toggle-btn {
    background: none;
    border: 1px solid rgba(0,200,212,0.3);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-color-dark);
    transition: all 0.2s ease
}

[data-theme="light"] .theme-toggle-btn {
    color: var(--text-color-light);
    border-color: var(--border-color-light)
}


.theme-toggle-btn:active {
    transform: scale(0.95)
}

#hero {
    background-color: #0a0a14;
    color: #ffffff;
    text-align: center;
    padding: 60px 0;
    position: relative;
    overflow: hidden
}

.hero-video-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden
}

#hero-video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center bottom
}

.hero-bg-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1
}

.hero-content {
    position: relative;
    z-index: 2
}

.hero-title {
    font-size: 3.8rem;
    margin-bottom: 20px;
    font-weight: 900;
    letter-spacing: -0.02em;
    line-height: 1.1;
    background: linear-gradient(135deg, #ffffff 0%, #a8e6f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(2px 2px 0 rgba(0,0,0,0.6));
}

.hero-subtitle {
    font-size: 1.4rem;
    margin-bottom: 40px;
    font-weight: 700;
    opacity: 1;
    letter-spacing: 0.05em;
    color: #ffffff;
    text-shadow: 2px 2px 0 rgba(0,0,0,0.8), 0 0 2px rgba(0,0,0,0.9);
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 40px
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px
}

.feature-card {
    background-color: var(--card-bg-dark);
    border: 1px solid var(--border-color-dark);
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2)
}

[data-theme="light"] .feature-card {
    background-color: var(--card-bg-light);
    border-color: var(--border-color-light);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.03)
}


.feature-card i {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 2.5rem
}

.feature-card h3 {
    margin-bottom: 10px;
    font-size: 1.25rem
}

.feature-card p {
    font-size: 0.95rem;
    color: #8a9bb8;
    margin-bottom: 0
}

[data-theme="light"] .feature-card p {
    color: #666
}

#preview {
    background-color: #060a12
}

[data-theme="light"] #preview {
    background-color: var(--card-bg-light)
}

.swiper {
    width: 100%;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1)
}

.swiper-slide {
    position: relative;
    background: #000;
    padding-bottom: 56.25%;
    overflow: hidden
}

.swiper-slide img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.9
}

.slide-caption {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.6);
    color: #ffffff;
    padding: 5px 15px;
    border-radius: 5px;
    font-size: 0.9rem;
    backdrop-filter: blur(5px)
}

.swiper-button-prev,
.swiper-button-next {
    color: #ffffff;
    text-shadow: 0 0 8px rgba(0, 0, 0, 0.6)
}

.swiper-pagination-bullet-active {
    background: var(--primary-color)
}

.showcase-header {
    padding: 20px 0;
    display: flex;
    align-items: center;
    gap: 15px
}

.douyin-link {
    margin-left: auto;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 8px 16px;
    border-radius: 20px;
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    font-size: 0.88rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s, color 0.2s, transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
}

.douyin-link:hover {
    background: var(--primary-color);
    color: #0a0a14;
    transform: translateY(-2px);
    box-shadow: 0 4px 18px rgba(0, 200, 212, 0.45);
}

.douyin-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.category-nav {
    position: sticky;
    top: 70px;
    z-index: 90;
    background-color: var(--bg-color-dark);
    padding: 15px 0;
    box-shadow: 0 4px 6px -4px rgba(0, 0, 0, 0.4);
    margin-bottom: 20px;
    transition: background-color 0.3s
}

[data-theme="light"] .category-nav {
    background-color: var(--bg-color-light);
    box-shadow: 0 4px 6px -4px rgba(0, 0, 0, 0.1);
}

.tabs-container {
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative
}

.tabs-wrapper {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 5px;
    scrollbar-width: none;
    -ms-overflow-style: none;
    scroll-behavior: smooth;
    flex: 1;
    min-width: 0
}

.tabs-wrapper::-webkit-scrollbar {
    display: none
}

.tabs-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1px solid var(--border-color-dark);
    background-color: var(--card-bg-dark);
    color: var(--text-color-dark);
    cursor: pointer;
    flex-shrink: 0;
    transition: all 0.2s ease;
    opacity: 0.8
}

[data-theme="light"] .tabs-arrow {
    background-color: var(--card-bg-light);
    color: var(--text-color-light);
    border-color: var(--border-color-light)
}

.tabs-arrow:disabled {
    opacity: 0.3;
    cursor: not-allowed
}


.tabs-arrow:active:not(:disabled) {
    transform: scale(0.95)
}

.tab-btn {
    padding: 8px 20px;
    border-radius: 20px;
    border: 1px solid var(--border-color-dark);
    background-color: var(--card-bg-dark);
    color: var(--text-color-dark);
    font-size: 0.95rem;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease
}

[data-theme="light"] .tab-btn {
    background-color: var(--card-bg-light);
    color: var(--text-color-light);
    border-color: var(--border-color-light)
}

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


.tab-btn:active {
    transform: scale(0.96);
    background-color: var(--primary-hover);
    color: white;
    border-color: var(--primary-hover)
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 15px;
    padding-bottom: 50px
}

.video-card {
    position: relative;
    aspect-ratio: 9 / 16;
    background-color: #000;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease
}


.video-card:active {
    transform: scale(0.98)
}

.video-poster {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block
}

.play-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: transparent;
    transition: background-color 0.3s ease
}

.play-overlay i {
    color: white;
    font-size: 2.5rem;
    text-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    opacity: 0.8;
    transition: transform 0.3s ease, opacity 0.3s ease
}

.video-info {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 10px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    color: white;
    font-size: 0.85rem;
    pointer-events: none
}

.page-view {
    display: none;
    animation: fadeIn 0.4s ease-in-out
}

.page-view.active {
    display: block
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

.video-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s;
    backdrop-filter: blur(5px)
}

.video-modal.active {
    display: flex
}

.modal-content {
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 500px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin: auto
}

.video-wrapper {
    width: 100%;
    height: 100%;
    background: #000;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
    position: relative
}

.video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: contain
}

.close-btn {
    position: absolute;
    top: -40px;
    right: 0;
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    z-index: 2001;
    transition: color 0.2s
}


.close-btn:active {
    transform: scale(0.9)
}

.modal-video-title {
    color: #fff;
    text-align: center;
    margin-top: 15px;
    font-weight: normal;
    font-size: 1rem
}

[data-theme="dark"] .footer {
    background-color: var(--card-bg-dark);
    border-top-color: var(--border-color-dark)
}

.copyright {
    margin: 0;
    font-size: 0.9rem;
    color: #777
}

[data-theme="dark"] .copyright {
    color: #888
}

@media (max-width:1200px) {
    .video-grid {
        grid-template-columns: repeat(4, 1fr)
    }
}


/* 新增：置顶标签样式 */
.top-tag {
    position: absolute;
    top: 0;
    left: 0;
    background-color: #000000;
    color: #ff9900;
    padding: 4px 8px;
    font-size: 12px;
    font-weight: bold;
    border-top-left-radius: 8px;
    border-bottom-right-radius: 8px;
    z-index: 10;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.5);
}

/* ==========================================
   导航菜单
   ========================================== */
.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 8px;
}

.nav-link {
    display: block;
    padding: 6px 14px;
    color: rgba(232,237,245,0.85);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 6px;
    transition: color 0.2s, background-color 0.2s;
    text-decoration: none;
}

[data-theme="light"] .nav-link {
    color: var(--text-color-light);
}


.nav-link.active {
    color: var(--primary-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.hamburger-btn {
    display: none;
    background: none;
    border: 1px solid rgba(0,200,212,0.3);
    border-radius: 6px;
    width: 40px;
    height: 40px;
    font-size: 1.1rem;
    cursor: pointer;
    color: var(--text-color-dark);
    transition: all 0.2s;
}

[data-theme="light"] .hamburger-btn {
    color: var(--text-color-light);
    border-color: var(--border-color-light);
}

.header.scrolled {
    box-shadow: 0 4px 20px rgba(0,0,0,0.12);
    backdrop-filter: blur(8px);
}

[data-theme="dark"] .header.scrolled {
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
}

/* ==========================================
   Hero 滚动提示
   ========================================== */
.hero-scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    color: rgba(255,255,255,0.7);
    font-size: 1.4rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ==========================================
   滚动动画
   ========================================== */
.animate-section {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ==========================================
   Overview 产品亮点
   ========================================== */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.overview-item {
    background-color: var(--card-bg-dark);
    border: 1px solid var(--border-color-dark);
    border-radius: 12px;
    padding: 28px 20px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

[data-theme="light"] .overview-item {
    background-color: var(--card-bg-light);
    border-color: var(--border-color-light);
}


.overview-item i {
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 14px;
}

.overview-item h3 {
    font-size: 1rem;
    margin-bottom: 6px;
}

.overview-item p {
    font-size: 0.85rem;
    color: #6a7f9a;
    margin: 0;
}

[data-theme="light"] .overview-item p {
    color: #666;
}

/* ==========================================
   Features 升级
   ========================================== */
.feature-card {
    border-radius: 12px !important;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    padding: 1px;
    background: linear-gradient(135deg, var(--primary-color), transparent 60%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s;
}


/* ==========================================
   Scenarios 应用场景
   ========================================== */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.scenario-card {
    background-color: var(--card-bg-dark);
    border: 1px solid var(--border-color-dark);
    border-radius: 12px;
    padding: 32px 24px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

[data-theme="light"] .scenario-card {
    background-color: var(--card-bg-light);
    border-color: var(--border-color-light);
}


.scenario-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), #0056b3);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}

.scenario-icon i {
    font-size: 1.6rem;
    color: #fff;
}

.scenario-card h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.scenario-card p {
    font-size: 0.9rem;
    color: #6a7f9a;
    margin: 0;
}

[data-theme="light"] .scenario-card p {
    color: #666;
}

/* ==========================================
   Pricing 定价方案
   ========================================== */
.section-subtitle {
    text-align: center;
    color: #6a7f9a;
    margin-top: -30px;
    margin-bottom: 40px;
    font-size: 1rem;
}

[data-theme="light"] .section-subtitle {
    color: #666;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: start;
}

.pricing-card {
    background-color: var(--card-bg-dark);
    border: 1px solid var(--border-color-dark);
    border-radius: 16px;
    padding: 32px 28px;
    position: relative;
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
}

[data-theme="light"] .pricing-card {
    background-color: var(--card-bg-light);
    border-color: var(--border-color-light);
}

.pricing-card-featured {
    border-color: var(--primary-color);
    box-shadow: 0 8px 32px rgba(0,200,212,0.2), 0 0 0 1px rgba(0,200,212,0.3);
    transform: scale(1.03);
}

[data-theme="light"] .pricing-card-featured {
    box-shadow: 0 8px 32px rgba(0,200,212,0.15);
}


.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary-color), #0056b3);
    color: #fff;
    padding: 4px 20px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.pricing-header {
    margin-bottom: 24px;
}

.pricing-header h3 {
    font-size: 1.2rem;
    margin-bottom: 12px;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 4px;
}

.price-amount {
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-range {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.price-period {
    font-size: 0.95rem;
    color: #888;
}

.pricing-features {
    list-style: none;
    padding: 0;
    margin: 0 0 28px;
    text-align: left;
}

.pricing-features li {
    padding: 8px 0;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color-dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

[data-theme="light"] .pricing-features li {
    border-color: var(--border-color-light);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features li i {
    color: var(--primary-color);
    flex-shrink: 0;
}

.btn-outline-primary {
    background: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    border-radius: 50px;
    padding: 10px 24px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-block;
    text-decoration: none;
    font-size: 1rem;
}

.btn-outline-primary:active {
    background: var(--primary-color);
    color: #fff;
    transform: scale(0.97)
}

/* ==========================================
   FAQ 手风琴
   ========================================== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border-color-dark);
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    transition: box-shadow 0.2s;
}

[data-theme="light"] .faq-item {
    border-color: var(--border-color-light);
}

.faq-item.open {
    box-shadow: 0 4px 16px rgba(0,200,212,0.15);
    border-color: var(--primary-color);
}

.faq-question {
    width: 100%;
    background: var(--card-bg-dark);
    border: none;
    padding: 18px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-color-dark);
    text-align: left;
    transition: background-color 0.2s;
}

[data-theme="light"] .faq-question {
    background: var(--card-bg-light);
    color: var(--text-color-light);
}


.faq-icon {
    flex-shrink: 0;
    color: var(--primary-color);
    transition: transform 0.3s;
}

.faq-item.open .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    background: var(--card-bg-dark);
    padding: 0 24px;
}

[data-theme="light"] .faq-answer {
    background: var(--card-bg-light);
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding: 0 24px 18px;
}

.faq-answer p {
    margin: 0;
    color: #6a7f9a;
    font-size: 0.95rem;
    line-height: 1.7;
}

[data-theme="light"] .faq-answer p {
    color: #555;
}

/* ==========================================
   CTA 行动号召
   ========================================== */
.section-cta {
    background: linear-gradient(135deg, #051525 0%, #0a2040 50%, #061830 100%);
    border-top: 1px solid rgba(0,200,212,0.2);
    padding: 80px 0;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.section-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(0,200,212,0.12) 0%, transparent 70%);
    pointer-events: none;
}

.cta-title {
    font-size: 2.4rem;
    margin-bottom: 16px;
    color: #fff;
    font-weight: 900;
    background: linear-gradient(135deg, #ffffff 0%, #a0e8f0 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 40px;
}

.cta-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-outline-white {
    background: transparent;
    border: 2px solid rgba(255,255,255,0.8);
    color: #fff;
    border-radius: 50px;
    padding: 15px 30px;
    font-size: 1.15rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-block;
    text-decoration: none;
}

.btn-outline-white:active {
    background: rgba(255,255,255,0.25);
    border-color: #fff;
    transform: scale(0.97)
}

/* ==========================================
   Footer 丰富化
   ========================================== */
.footer {
    background-color: #060a12;
    padding: 60px 0 0;
    border-top: 1px solid rgba(0,200,212,0.15);
}

[data-theme="light"] .footer {
    background-color: var(--card-bg-light);
    border-top-color: var(--border-color-light);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 40px;
    padding-bottom: 40px;
}

.footer-brand .footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
}

.footer-brand .footer-logo img {
    height: 40px;
}

.footer-brand .footer-logo span {
    font-size: 1.1rem;
    font-weight: 600;
}

.footer-brand {
    text-align: left;
}

.footer-company {
    font-size: 0.85rem;
    color: #888 !important;
    margin-bottom: 12px;
}

[data-theme="dark"] .footer-company {
    color: #aaa !important;
}

.footer-contact p {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

[data-theme="dark"] .footer-contact p {
    color: #aaa;
}

.footer-contact i {
    color: var(--primary-color);
    width: 16px;
}

.footer-links h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-color-dark);
}

[data-theme="light"] .footer-links h4 {
    color: var(--text-color-light);
}

.footer-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links ul li a {
    font-size: 0.9rem;
    color: #6a7f9a;
    text-decoration: none;
    transition: color 0.2s;
}

[data-theme="light"] .footer-links ul li a {
    color: #666;
}


.footer-bottom {
    border-top: 1px solid rgba(0,200,212,0.1);
    padding: 20px 0;
    text-align: center;
}

[data-theme="light"] .footer-bottom {
    border-top-color: var(--border-color-light);
}

.footer-bottom .copyright {
    font-size: 0.85rem;
    color: #888;
    margin: 0;
}

.footer-bottom .copyright a {
    color: #888;
    text-decoration: none;
}


/* 页脚二维码 */
.footer-qr h4 {
    font-size: 1rem;
    margin-bottom: 16px;
    color: var(--text-color-dark);
}

[data-theme="light"] .footer-qr h4 {
    color: var(--text-color-light);
}

.footer-qr-list {
    display: flex;
    gap: 16px;
}

.footer-qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.footer-qr-item img {
    width: 90px;
    height: 90px;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid var(--border-color-dark);
    background: #fff;
}

[data-theme="light"] .footer-qr-item img {
    border-color: var(--border-color-light);
}

.footer-qr-item span {
    font-size: 0.8rem;
    color: #888;
}

/* 联系客服弹窗 */
.contact-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.contact-modal.active {
    display: flex;
}

.contact-modal-content {
    background: var(--card-bg-dark);
    border-radius: 16px;
    padding: 36px 40px;
    position: relative;
    max-width: 420px;
    width: 90%;
    text-align: center;
    border: 1px solid var(--border-color-dark);
}

[data-theme="light"] .contact-modal-content {
    background: var(--bg-color-light);
    border-color: var(--border-color-light);
}

.contact-modal-content h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
}

.contact-phone {
    font-size: 0.95rem;
    color: #6a7f9a;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

[data-theme="light"] .contact-phone {
    color: #666;
}

.contact-phone i {
    color: var(--primary-color);
}

.contact-qr-list {
    display: flex;
    gap: 24px;
    justify-content: center;
}

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

.contact-qr-item img {
    width: 140px;
    height: 140px;
    object-fit: contain;
    border-radius: 10px;
    border: 1px solid var(--border-color-dark);
    background: #fff;
}

[data-theme="light"] .contact-qr-item img {
    border-color: var(--border-color-light);
}

.contact-qr-item span {
    font-size: 0.85rem;
    color: #888;
}

/* 二维码点击放大 */
.contact-qr-item img {
    cursor: zoom-in;
}

.image-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.85);
    z-index: 3000;
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
}

.image-modal.active {
    display: flex;
}

.image-modal img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

/* ==========================================
   响应式
   ========================================== */
@media (max-width: 1024px) {
    .overview-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 420px;
        margin: 0 auto;
    }
    .pricing-card-featured {
        transform: none;
    }
}

@media (hover: hover) and (max-width: 1024px) {
    .pricing-card-featured:hover {
        transform: translateY(-4px);
    }
}

@media (max-width: 992px) {
    .video-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .footer-brand {
        grid-column: 1 / -1;
    }
    .footer-qr {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .category-nav {
        top: 60px
    }
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px
    }
    .modal-content {
        max-width: 100%;
        max-height: 100%;
        border-radius: 0
    }
    .video-wrapper {
        border-radius: 0
    }
    .close-btn {
        top: 20px;
        right: 20px;
        background: rgba(0, 0, 0, 0.5);
        width: 40px;
        height: 40px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.5rem
    }
    .modal-video-title {
        position: absolute;
        bottom: 40px;
        left: 20px;
        text-align: left;
        text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
        margin: 0;
        pointer-events: none
    }
    .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: rgba(7,11,20,0.97);
        box-shadow: 0 8px 20px rgba(0,0,0,0.3);
        z-index: 999;
        padding: 10px 0;
    }
    [data-theme="light"] .main-nav {
        background-color: var(--bg-color-light);
    }
    .main-nav.open {
        display: block;
    }
    .nav-list {
        flex-direction: column;
        gap: 0;
        padding: 0 20px;
    }
    .nav-link {
        padding: 12px 0;
        border-bottom: 1px solid rgba(0,200,212,0.1);
        border-radius: 0;
    }
    [data-theme="light"] .nav-link {
        border-color: var(--border-color-light);
    }
    .hamburger-btn {
        display: flex;
        align-items: center;
        justify-content: center;
    }
    .overview-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    /* 移动端 footer：单列，紧凑排版 */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    .footer {
        padding: 36px 0 0;
    }
    .footer-brand .footer-logo img {
        height: 32px;
    }
    .footer-brand .footer-logo span {
        font-size: 1rem;
    }
    /* 移动端二维码：横排，缩小尺寸，不占整行 */
    .footer-qr {
        border-top: 1px solid rgba(0,200,212,0.1);
        padding-top: 20px;
    }
    [data-theme="light"] .footer-qr {
        border-top-color: var(--border-color-light);
    }
    .footer-qr h4 {
        margin-bottom: 12px;
    }
    .footer-qr-list {
        flex-direction: row;
        gap: 12px;
        align-items: flex-start;
    }
    .footer-qr-item img {
        width: 70px;
        height: 70px;
    }
    .cta-title {
        font-size: 1.8rem;
    }
}

/* ==========================================
   客服悬浮球
   ========================================== */
.float-cs {
    position: fixed;
    right: 20px;
    bottom: 80px;
    z-index: 1500;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0;
}

/* 悬浮按钮容器（图标+文字纵向排列） */
.float-cs-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
    position: relative;
    z-index: 2;
}

.float-cs-btn-icon {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    background: #fff;
    box-shadow: 0 4px 16px rgba(0,0,0,0.18);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s, box-shadow 0.2s;
}


.float-cs-btn i {
    font-size: 1.4rem;
    color: var(--primary-color);
    transition: opacity 0.2s;
}

.float-cs-btn .icon-open  { display: block; }
.float-cs-btn .icon-close { display: none; }
.float-cs.open .float-cs-btn .icon-open  { display: none; }
.float-cs.open .float-cs-btn .icon-close { display: block; }

/* 按钮下方文字标签 */
.float-cs-label {
    font-size: 0.75rem;
    color: #6a7f9a;
    white-space: nowrap;
    pointer-events: none;
    font-weight: 500;
}

[data-theme="light"] .float-cs-label {
    color: #555;
}

/* 弹出面板 */
.float-cs-panel {
    position: absolute;
    bottom: 62px;
    right: 0;
    background: var(--card-bg-dark);
    border: 1px solid var(--border-color-dark);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    width: 240px;
    text-align: center;
    opacity: 0;
    transform: translateY(12px) scale(0.95);
    transform-origin: bottom right;
    pointer-events: none;
    transition: opacity 0.22s ease, transform 0.22s ease;
}

[data-theme="light"] .float-cs-panel {
    background: var(--bg-color-light);
    border-color: var(--border-color-light);
}

.float-cs.open .float-cs-panel {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.float-cs-panel h5 {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 0 0 6px;
    color: var(--text-color-dark);
}

[data-theme="light"] .float-cs-panel h5 {
    color: var(--text-color-light);
}

.float-cs-panel .cs-phone {
    font-size: 0.82rem;
    color: #888;
    margin: 0 0 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.float-cs-panel .cs-phone i {
    color: var(--primary-color);
    font-size: 0.8rem;
}

.float-cs-qr-list {
    display: flex;
    gap: 12px;
    justify-content: center;
}

.float-cs-qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.float-cs-qr-item img {
    width: 88px;
    height: 88px;
    object-fit: contain;
    border-radius: 8px;
    border: 1px solid var(--border-color-dark);
    background: #fff;
    cursor: zoom-in;
    transition: transform 0.15s;
}

[data-theme="light"] .float-cs-qr-item img {
    border-color: var(--border-color-light);
}


.float-cs-qr-item span {
    font-size: 0.78rem;
    color: #888;
}

/* 移动端适配 */
@media (max-width: 576px) {
    .features-grid {
        grid-template-columns: 1fr
    }
    .section-title {
        margin-bottom: 30px
    }
    .swiper {
        border-radius: 0
    }
    .container {
        padding: 0 15px
    }
    .hero-title {
        font-size: 2.2rem
    }
    .hero-subtitle {
        font-size: 1.1rem
    }
    .btn-back {
        width: 35px;
        height: 35px
    }
    .tab-btn {
        padding: 6px 15px;
        font-size: 0.85rem
    }
    .overview-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px
    }
    .scenarios-grid {
        grid-template-columns: 1fr
    }
    .pricing-grid {
        max-width: 100%
    }
    .float-cs {
        right: 14px;
        bottom: 70px;
    }
    .float-cs-btn-icon {
        width: 46px;
        height: 46px;
    }
    .float-cs-btn i {
        font-size: 1.2rem;
    }
    .float-cs-panel {
        width: 210px;
        padding: 16px;
    }
    .float-cs-qr-item img {
        width: 76px;
        height: 76px;
    }
}

/* ==========================================
   统一 hover 效果
   ========================================== */
@media (hover: hover) {
    a:hover { color: var(--primary-hover) }

    .btn-primary:hover {
        background: linear-gradient(135deg, #00e5f5 0%, #0096ff 100%);
        border-color: transparent;
        color: #ffffff;
        transform: translateY(-2px);
        box-shadow: 0 8px 24px rgba(0,200,212,0.4)
    }

    .btn-secondary:hover {
        background-color: rgba(255, 255, 255, 0.1);
        color: #ffffff;
        transform: translateY(-2px);
        box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1)
    }

    .btn-back:hover {
        background-color: var(--primary-color);
        color: white;
        border-color: var(--primary-color);
        transform: translateY(-2px)
    }

    .theme-toggle-btn:hover {
        background-color: var(--card-bg-light)
    }
    [data-theme="dark"] .theme-toggle-btn:hover {
        background-color: var(--border-color-dark)
    }

    .feature-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 8px 25px rgba(0,200,212,0.12)
    }
    [data-theme="light"] .feature-card:hover {
        box-shadow: 0 8px 25px rgba(0, 0, 0, 0.07)
    }

    .tabs-arrow:not(:disabled):hover {
        background-color: var(--primary-color);
        color: white;
        border-color: var(--primary-color);
        opacity: 1
    }

    .tab-btn:not(.active):hover {
        border-color: var(--primary-color);
        color: var(--primary-color)
    }

    .close-btn:hover { color: var(--primary-color) }

    .nav-link:hover {
        color: var(--primary-color);
        background-color: rgba(0,123,255,0.08);
    }

    .overview-item:hover {
        transform: translateY(-4px);
        box-shadow: 0 8px 24px rgba(0,200,212,0.15);
        border-color: var(--primary-color);
    }

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

    .scenario-card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 30px rgba(0,200,212,0.1);
    }

    .pricing-card:hover {
        transform: translateY(-4px);
        box-shadow: 0 12px 36px rgba(0,0,0,0.1);
    }
    .pricing-card-featured:hover {
        transform: scale(1.03) translateY(-4px);
    }

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

    .faq-question:hover {
        background-color: rgba(0,123,255,0.05);
    }

    .btn-outline-white:hover {
        background: rgba(255,255,255,0.15);
        border-color: #fff;
        color: #fff;
        transform: translateY(-2px);
    }

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

    .float-cs-btn:hover .float-cs-btn-icon {
        transform: scale(1.08);
        box-shadow: 0 6px 24px rgba(0,0,0,0.22);
    }

    .float-cs-qr-item img:hover { transform: scale(1.04); }

    .video-card:hover {
        transform: scale(1.02);
        box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
        z-index: 5
    }
    .video-card:hover .play-overlay {
        background-color: rgba(0, 0, 0, 0.1)
    }
    .video-card:hover .play-overlay i {
        transform: scale(1.1);
        opacity: 1
    }
}

/* ==========================================
   Hero 增强层：badge / 网格线 / 顶部光晕
   ========================================== */
.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    border: 1px solid rgba(0,200,212,0.5);
    border-radius: 30px;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: #00c8d4;
    background: rgba(0,200,212,0.08);
    margin-bottom: 24px;
    text-transform: uppercase;
    backdrop-filter: blur(4px);
}

.hero-grid-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background-image:
        linear-gradient(rgba(0,200,212,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,200,212,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero-glow-top {
    position: absolute;
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 400px;
    background: radial-gradient(ellipse at center, rgba(0,200,212,0.12) 0%, transparent 70%);
    z-index: 1;
    pointer-events: none;
}

/* Header scrolled 深色阴影 */
.header.scrolled {
    box-shadow: 0 4px 24px rgba(0,0,0,0.4), 0 1px 0 rgba(0,200,212,0.1);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
}

/* hero 固定高度，不遮挡页面内容 */
#hero {
    height: 62vh;
    min-height: 480px;
    max-height: 680px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 60px 0;
    position: relative;
    overflow: hidden;
    background-color: #070b14;
    color: #fff;
    text-align: center;
}

/* showcase view 深色背景 */
#showcase-view {
    background-color: var(--bg-color-dark);
    min-height: 100vh;
}

[data-theme="light"] #showcase-view {
    background-color: var(--bg-color-light);
}

/* showcase header 文字颜色 */
.showcase-header h3 {
    color: var(--text-color-dark);
}

[data-theme="light"] .showcase-header h3 {
    color: var(--text-color-light);
}

/* footer 公司名 / 联系 */
.footer-company {
    color: #6a7f9a !important;
}

.footer-contact p {
    color: #6a7f9a;
}

[data-theme="light"] .footer-contact p {
    color: #666;
}

.footer-bottom .copyright,
.footer-bottom .copyright a {
    color: #4a5a72;
}

[data-theme="light"] .footer-bottom .copyright,
[data-theme="light"] .footer-bottom .copyright a {
    color: #888;
}

/* nav-link active 深色下 */
.nav-link.active {
    color: var(--primary-color);
}

/* theme toggle hover */
@media (hover: hover) {
    .theme-toggle-btn:hover {
        background-color: rgba(0,200,212,0.08);
        border-color: var(--primary-color);
    }
}

/* pricing featured 深色发光旋转边框 */
@keyframes border-rotate {
    from { --border-angle: 0turn; }
    to   { --border-angle: 1turn; }
}

/* hero 载入动画 */
@keyframes heroFadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

.hero-badge {
    animation: heroFadeUp 0.6s var(--ease-expo) 0.1s both;
}

.hero-title {
    animation: heroFadeUp 0.7s var(--ease-expo) 0.25s both;
}

.hero-subtitle {
    animation: heroFadeUp 0.7s var(--ease-expo) 0.4s both;
}

.hero-buttons {
    animation: heroFadeUp 0.7s var(--ease-expo) 0.55s both;
}