/* ================================
   AI音频算法科技 - 网站样式
   深色科技风 · 玻璃拟态 · 声波纹理
   ================================ */

/* ---------- 导航栏 Logo ---------- */
.logo-img {
    height: 114px;
    width: auto;
    /* 将黑色 logo 反转为白色，适配深色主题 */
    filter: brightness(0) invert(1);
    transition: var(--transition);
}

.navbar.scrolled .logo-img {
    filter: brightness(0) invert(1);
}

.nav-logo:hover .logo-img {
    transform: scale(1.05);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-logo .logo-text {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-left: 1px solid var(--border-color);
    padding-left: 12px;
    white-space: nowrap;
}

.navbar.scrolled .nav-logo .logo-text {
    color: var(--text-primary);
}

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

:root {
    /* 色彩变量 */
    --bg-primary: #0A1628;
    --bg-secondary: #0F2847;
    --bg-card: rgba(15, 40, 71, 0.5);
    --bg-card-hover: rgba(20, 55, 95, 0.7);
    --accent-cyan: #00D4FF;
    --accent-blue: #4A9EFF;
    --accent-purple: #7B61FF;
    --text-primary: #E8F1FF;
    --text-secondary: #A8BFD9;
    --text-muted: #6B85A8;
    --border-color: rgba(74, 158, 255, 0.15);
    --border-hover: rgba(0, 212, 255, 0.4);
    --gradient-primary: linear-gradient(135deg, #00D4FF, #4A9EFF);
    --gradient-secondary: linear-gradient(135deg, #4A9EFF, #7B61FF);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);

    /* 尺寸变量 */
    --max-width: 1200px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
                 Helvetica, Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

/* ---------- 通用容器 ---------- */
.section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 100px 24px;
    position: relative;
}

.section-alt {
    max-width: 100%;
    background: linear-gradient(180deg, transparent, rgba(15, 40, 71, 0.3) 15%, rgba(15, 40, 71, 0.3) 85%, transparent);
}

.section-alt > * {
    max-width: var(--max-width);
    margin-left: auto;
    margin-right: auto;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 3px;
    color: var(--accent-cyan);
    padding: 6px 16px;
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 20px;
    margin-bottom: 20px;
    background: rgba(0, 212, 255, 0.05);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

/* ---------- 通用按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #0A1628;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 212, 255, 0.5);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.05);
}

.btn-arrow {
    transition: transform 0.3s;
}

.btn-primary:hover .btn-arrow {
    transform: translateX(4px);
}

/* ---------- 图片占位符样式 ---------- */
.img-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(15, 40, 71, 0.3);
    border: 2px dashed rgba(74, 158, 255, 0.25);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
    transition: var(--transition);
}

.img-placeholder::before {
    content: '';
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 20px,
        rgba(74, 158, 255, 0.03) 20px,
        rgba(74, 158, 255, 0.03) 40px
    );
}

.img-placeholder:hover {
    border-color: var(--accent-cyan);
    background: rgba(15, 40, 71, 0.5);
}

.placeholder-content {
    text-align: center;
    z-index: 1;
}

.placeholder-icon {
    font-size: 2.5rem;
    opacity: 0.5;
    margin-bottom: 8px;
}

.placeholder-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 4px;
}

.placeholder-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.7;
    line-height: 1.5;
}

/* ================================
   导航栏
   ================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 12px 0;
    transition: var(--transition);
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 22, 40, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 8px 0;
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: var(--transition);
    border-radius: var(--radius-sm);
}

.nav-link:hover {
    color: var(--accent-cyan);
    background: rgba(0, 212, 255, 0.05);
}

.nav-link-btn {
    background: var(--gradient-primary);
    color: #0A1628 !important;
    font-weight: 600;
    padding: 8px 20px;
}

.nav-link-btn:hover {
    opacity: 0.9;
    background: var(--gradient-primary);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* ================================
   Hero 首屏
   ================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 24px 60px;
    overflow: hidden;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(74, 158, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(74, 158, 255, 0.04) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}

.hero-bg-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 212, 255, 0.15), transparent 70%);
    top: -100px;
    right: -100px;
    filter: blur(60px);
    animation: glow-pulse 6s ease-in-out infinite;
}

@keyframes glow-pulse {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.1); }
}

/* 声波动画 */
.sound-wave {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100px;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 4px;
    padding: 0 20px;
    opacity: 0.15;
}

.sound-wave span {
    flex: 1;
    max-width: 8px;
    background: var(--gradient-primary);
    border-radius: 4px;
    animation: sound-bar 1.2s ease-in-out infinite;
}

.sound-wave span:nth-child(odd) { animation-delay: 0.1s; }
.sound-wave span:nth-child(3n) { animation-delay: 0.2s; }
.sound-wave span:nth-child(4n) { animation-delay: 0.3s; }
.sound-wave span:nth-child(5n) { animation-delay: 0.15s; }
.sound-wave span:nth-child(6n) { animation-delay: 0.25s; }
.sound-wave span:nth-child(7n) { animation-delay: 0.05s; }

@keyframes sound-bar {
    0%, 100% { height: 15px; }
    50% { height: 80px; }
}

.hero-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
    width: 100%;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--accent-cyan);
    margin-bottom: 24px;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-cyan);
    box-shadow: 0 0 10px var(--accent-cyan);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
}

.stat-item {
    text-align: left;
}

.stat-num {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.stat-num sup {
    font-size: 0.9rem;
    font-weight: 600;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-color);
}

.hero-visual {
    min-height: 450px;
}

/* Hero 主图（AI音频可视化） */
.hero-main-img {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: transparent;
    box-shadow: 0 8px 40px rgba(0, 212, 255, 0.15);
    animation: hero-float 6s ease-in-out infinite;
}

.hero-main-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center center;
    display: block;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.hero-main-img:hover img {
    transform: scale(1.05);
}

.hero-main-img::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    pointer-events: none;
    background:
        linear-gradient(180deg, transparent 0%, transparent 85%, rgba(10, 22, 40, 0.4) 100%),
        linear-gradient(135deg, rgba(0, 212, 255, 0.06), transparent 50%);
    z-index: 1;
}

@keyframes hero-float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.scroll-hint {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    z-index: 2;
}

.scroll-hint span {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 8px;
}

.scroll-arrow {
    width: 20px;
    height: 32px;
    border: 2px solid var(--text-muted);
    border-radius: 12px;
    margin: 0 auto;
    position: relative;
}

.scroll-arrow::after {
    content: '';
    width: 4px;
    height: 8px;
    background: var(--accent-cyan);
    border-radius: 2px;
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-down 2s ease-in-out infinite;
}

@keyframes scroll-down {
    0% { opacity: 1; top: 6px; }
    100% { opacity: 0; top: 20px; }
}

/* ================================
   核心优势
   ================================ */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s;
}

.advantage-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    box-shadow: var(--shadow-glow);
}

.advantage-card:hover::before {
    transform: scaleX(1);
}

.adv-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    display: inline-block;
    padding: 16px;
    background: rgba(0, 212, 255, 0.08);
    border-radius: var(--radius-sm);
}

.advantage-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.advantage-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ================================
   核心应用场景
   ================================ */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.scenario-item {
    text-align: center;
    padding: 40px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.scenario-item:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.scenario-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.scenario-item h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ================================
   关于我们
   ================================ */
.about-container {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.about-intro {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 48px;
    align-items: center;
}

.about-text h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.about-text p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.9;
}

.about-visual {
    min-height: 320px;
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.about-visual:hover {
    border-color: var(--border-hover);
    box-shadow: 0 8px 40px rgba(0, 212, 255, 0.2);
    transform: translateY(-4px);
}

.about-visual img {
    width: 100%;
    height: 100%;
    min-height: 320px;
    object-fit: cover;
    object-position: center center;
    display: block;
}

/* 发展历程时间线 */
.timeline {
    margin-top: 20px;
}

.timeline-title {
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.timeline-track {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding-left: 40px;
}

.timeline-line {
    position: absolute;
    left: 11px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--accent-cyan), var(--accent-purple), transparent);
}

.timeline-item {
    position: relative;
    margin-bottom: 48px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: -40px;
    top: 4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 3px solid var(--accent-cyan);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.timeline-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px 32px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.timeline-content:hover {
    border-color: var(--border-hover);
    transform: translateX(8px);
}

.timeline-content h4 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 10px;
}

.timeline-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 核心竞争优势 */
.about-competition {
    margin-top: 20px;
}

.competition-title {
    font-size: 1.75rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.competition-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px 28px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.competition-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
}

.comp-vs {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.competition-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ================================
   产品中心
   ================================ */
.product-category {
    margin-bottom: 60px;
}

.product-category:last-child {
    margin-bottom: 0;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
}

.category-num {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.category-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    padding-left: 16px;
    border-left: 3px solid var(--accent-cyan);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.product-grid-2 {
    grid-template-columns: repeat(2, 1fr);
    max-width: 760px;
}

.product-grid-1 {
    grid-template-columns: 1fr;
}

.product-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.product-icon {
    font-size: 2rem;
    margin-bottom: 16px;
    display: inline-block;
    width: fit-content;
    padding: 12px;
    background: rgba(0, 212, 255, 0.08);
    border-radius: var(--radius-sm);
}

.product-card h4 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.product-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    flex: 1;
}

.product-img {
    min-height: 130px;
    border-radius: var(--radius-sm);
}

/* ================================
   行业解决方案
   ================================ */
.solutions-container {
    margin-top: 20px;
}

.solution-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 32px;
    justify-content: center;
}

.solution-tab {
    padding: 12px 28px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.solution-tab:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

.solution-tab.active {
    background: var(--gradient-primary);
    color: #0A1628;
    border-color: transparent;
    font-weight: 600;
}

.solution-panels {
    position: relative;
}

.solution-panel {
    display: none;
    grid-template-columns: 1.3fr 1fr;
    gap: 40px;
    align-items: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 48px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.solution-panel.active {
    display: grid;
    animation: fade-in 0.5s ease;
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.solution-num {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    margin-bottom: 12px;
}

.solution-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 28px;
    color: var(--text-primary);
}

.solution-detail {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.detail-block {
    padding-left: 16px;
    border-left: 3px solid var(--accent-cyan);
}

.detail-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.detail-block p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.solution-visual {
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ================================
   标杆案例
   ================================ */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.case-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.case-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.case-img {
    min-height: 180px;
    border-radius: 0;
    border: none;
    border-bottom: 2px dashed rgba(74, 158, 255, 0.2);
}

.case-body {
    padding: 24px;
}

.case-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-cyan);
    padding: 4px 12px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 12px;
    margin-bottom: 12px;
}

.case-body h4 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
    line-height: 1.5;
}

.case-body p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ================================
   资讯动态
   ================================ */
.news-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.news-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 32px 28px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.news-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.news-icon {
    font-size: 2rem;
    margin-bottom: 16px;
    display: inline-block;
    padding: 12px;
    background: rgba(0, 212, 255, 0.08);
    border-radius: var(--radius-sm);
}

.news-card h4 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.news-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.news-link {
    font-size: 0.85rem;
    color: var(--accent-cyan);
    font-weight: 500;
    transition: var(--transition);
}

.news-link:hover {
    opacity: 0.8;
    gap: 4px;
}

/* ================================
   联系我们
   ================================ */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: stretch;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 20px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.contact-item:hover {
    border-color: var(--border-hover);
    transform: translateX(4px);
}

.contact-icon {
    font-size: 1.5rem;
    padding: 12px;
    background: rgba(0, 212, 255, 0.08);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.contact-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.contact-channels {
    padding: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.channels-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 16px;
}

.channels-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.channel-tag {
    font-size: 0.8rem;
    padding: 6px 14px;
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: 16px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.channel-tag:hover {
    background: rgba(0, 212, 255, 0.15);
    color: var(--accent-cyan);
}

.contact-map {
    min-height: 100%;
}

/* ================================
   页脚
   ================================ */
.footer {
    background: rgba(10, 22, 40, 0.8);
    border-top: 1px solid var(--border-color);
    padding: 60px 24px 24px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo .logo-img {
    height: 48px;
}

.footer-logo span {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-left: 1px solid var(--border-color);
    padding-left: 12px;
    white-space: nowrap;
}

.footer-slogan {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.footer-col h5 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--accent-cyan);
    padding-left: 4px;
}

.footer-bottom {
    max-width: var(--max-width);
    margin: 24px auto 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.footer-note {
    font-size: 0.75rem !important;
    opacity: 0.6;
}

/* ================================
   返回顶部
   ================================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    color: #0A1628;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 30px rgba(0, 212, 255, 0.5);
}

/* ================================
   滚动动画
   ================================ */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ================================
   响应式
   ================================ */
@media (max-width: 1024px) {
    .hero-title { font-size: 2.4rem; }
    .section-title { font-size: 2rem; }

    .advantages-grid,
    .scenarios-grid,
    .cases-grid,
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .competition-grid {
        grid-template-columns: 1fr;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-visual {
        min-height: 300px;
    }

    .about-intro,
    .solution-panel.active,
    .contact-container {
        grid-template-columns: 1fr;
    }

    .solution-panel.active {
        padding: 32px;
    }

    .footer-container {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(10, 22, 40, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: 20px;
        gap: 4px;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-title { font-size: 1.8rem; }
    .hero-subtitle { font-size: 1rem; }
    .section-title { font-size: 1.6rem; }
    .section { padding: 60px 16px; }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        justify-content: center;
        width: 100%;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }

    .stat-divider {
        display: none;
    }

    .advantages-grid,
    .scenarios-grid,
    .cases-grid,
    .news-grid,
    .product-grid,
    .product-grid-2 {
        grid-template-columns: 1fr;
    }

    .timeline-track {
        padding-left: 32px;
    }

    .solution-tabs {
        gap: 6px;
    }

    .solution-tab {
        padding: 10px 20px;
        font-size: 0.85rem;
    }

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

    .back-to-top {
        bottom: 20px;
        right: 20px;
    }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.5rem; }
    .stat-num { font-size: 1.5rem; }
    .category-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .category-title {
        padding-left: 0;
        border-left: none;
    }
}

/* ================================
   产品中心 - 旗舰款特色样式
   ================================ */
.product-grid-featured {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}

/* 旗舰款产品卡 */
.product-featured {
    background: linear-gradient(135deg, rgba(15, 40, 71, 0.7), rgba(20, 55, 95, 0.5));
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-md);
    padding: 0;
    overflow: hidden;
    position: relative;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 8px 32px rgba(0, 212, 255, 0.1);
}

.product-featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple), var(--accent-cyan));
    background-size: 200% 100%;
    animation: shimmer 3s linear infinite;
}

@keyframes shimmer {
    0% { background-position: 0% 0; }
    100% { background-position: 200% 0; }
}

.featured-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    background: linear-gradient(135deg, #FFB800, #FF8C42);
    color: #0A1628;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    border-radius: 0 0 12px 0;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
}

.featured-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    align-items: center;
}

.featured-img-wrap {
    position: relative;
    height: 100%;
    min-height: 600px;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    padding: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.featured-img {
    max-width: 100%;
    max-height: 540px;
    object-fit: contain;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.15));
    transition: transform 0.4s;
}

.featured-img-wrap:hover .featured-img {
    transform: scale(1.03);
}

.featured-icon {
    position: absolute;
    bottom: 16px;
    right: 16px;
    width: 60px;
    height: 60px;
    object-fit: contain;
    opacity: 0.85;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    padding: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.featured-icon:hover {
    opacity: 1;
    transform: scale(1.1);
}

.featured-content {
    padding: 36px 32px;
}

.featured-content h4 {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.featured-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--border-color);
}

.selling-points {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.selling-point {
    display: flex;
    gap: 14px;
    align-items: flex-start;
}

.sp-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 10px;
}

.selling-point:nth-child(2) .sp-icon {
    background: rgba(74, 158, 255, 0.1);
    border-color: rgba(74, 158, 255, 0.3);
}

.selling-point:nth-child(3) .sp-icon {
    background: rgba(123, 97, 255, 0.1);
    border-color: rgba(123, 97, 255, 0.3);
}

.sp-content h5 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 4px;
}

.selling-point:nth-child(2) .sp-content h5 {
    color: var(--accent-blue);
}

.selling-point:nth-child(3) .sp-content h5 {
    color: var(--accent-purple);
}

.sp-content p {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.sp-content p strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* 声纹采集终端特性列表 */
.feature-list {
    list-style: none;
    margin: 0 0 20px;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.feature-list li {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.5;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.feat-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent-cyan);
    margin-top: 7px;
    flex-shrink: 0;
    box-shadow: 0 0 8px var(--accent-cyan);
}

.feature-list li strong {
    color: var(--text-primary);
    font-weight: 600;
}

/* 真实产品图样式 */
.product-img-real {
    min-height: 140px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: linear-gradient(135deg, #f5f7fa 0%, #e8ecf1 100%);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    transition: var(--transition);
}

.product-img-real:hover {
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.product-img-real img {
    max-width: 100%;
    max-height: 140px;
    object-fit: contain;
    filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.15));
}

/* 真实案例图样式 */
.case-img-real {
    min-height: 180px;
    overflow: hidden;
    border-bottom: 2px solid var(--border-color);
}

.case-img-real img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    transition: transform 0.4s;
}

.case-card:hover .case-img-real img {
    transform: scale(1.08);
}

/* 解决方案海报 */
.solution-poster {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.solution-poster:hover {
    transform: scale(1.02);
}

/* ================================
   响应式 - 旗舰款产品
   ================================ */
@media (max-width: 1024px) {
    .product-grid-featured {
        grid-template-columns: 1fr;
    }
    .featured-body {
        grid-template-columns: 1fr;
    }
    .featured-img-wrap {
        min-height: 500px;
    }
    .featured-img {
        max-height: 440px;
    }
    .solution-panel.active {
        padding: 24px;
    }
}

@media (max-width: 768px) {
    .featured-content {
        padding: 24px 20px;
    }
    .featured-content h4 {
        font-size: 1.2rem;
    }
    .nav-logo .logo-text {
        display: none;
    }
}