/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0d47a1;
    --primary-dark: #0a3578;
    --primary-light: #1565c0;
    --accent-color: #00bcd4;
    --secondary-color: #f5f7fa;
    --text-dark: #1a1a2e;
    --text-light: #6b7280;
    --white: #ffffff;
    --gray-100: #f8fafc;
    --gray-200: #e5e7eb;
    --gray-800: #1f2937;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.brand-logo {
    height: 40px;
    width: auto;
    object-fit: contain;
}

.company-logo {
    height: 30px;
    width: auto;
    object-fit: contain;
    margin-left: 10px;
    opacity: 0.8;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* 语言下拉菜单 */
.lang-dropdown {
    position: relative;
    display: inline-block;
}

.lang-dropbtn {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
    padding: 10px 20px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(13, 71, 161, 0.3);
    min-width: 100px;
    justify-content: center;
}

.lang-dropbtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(13, 71, 161, 0.4);
}

.lang-dropbtn:active {
    transform: translateY(0);
}

.lang-dropbtn .arrow {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.lang-dropbtn.active .arrow {
    transform: rotate(180deg);
}

.lang-dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    margin-top: 8px;
    background: var(--white);
    min-width: 140px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    border-radius: var(--radius);
    z-index: 9999;
    overflow: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: auto;
}

.lang-dropdown-content.show {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.lang-dropdown-content a {
    color: var(--text-dark);
    padding: 14px 20px;
    text-decoration: none;
    display: block;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all 0.2s ease;
    border-bottom: 1px solid var(--gray-100);
    cursor: pointer;
    pointer-events: auto;
    position: relative;
    z-index: 10000;
}

.lang-dropdown-content a:last-child {
    border-bottom: none;
}

.lang-dropdown-content a:hover {
    background: var(--gray-100);
    color: var(--primary-color);
    padding-left: 24px;
}

.lang-dropdown-content a.active {
    background: var(--primary-color);
    color: var(--white);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s;
}

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

.nav-links a:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    border-radius: 3px;
    transition: 0.3s;
}

/* 语言切换 */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1.5rem;
    padding-left: 1.5rem;
    border-left: 1px solid var(--gray-200);
}

.lang-btn {
    padding: 6px 14px;
    border: 1px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.lang-btn:hover,
.lang-btn.active {
    background: var(--primary-color);
    color: var(--white);
}

/* 技术方案区块 */
.solutions {
    padding: 100px 0;
    background: var(--white);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.solution-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--gray-200);
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.solution-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2rem;
}

.solution-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.solution-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 二维码占位符 */
.qrcode-placeholder {
    width: 120px;
    height: 120px;
    background: var(--gray-100);
    border: 2px dashed var(--gray-200);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 1rem auto 0;
    color: var(--text-light);
    font-size: 0.85rem;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
    font-size: 12px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(13, 71, 161, 0.3);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 10px 24px;
    font-size: 0.95rem;
}

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

/* Hero 区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 50%, #90caf9 100%);
    padding-top: 100px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    background: radial-gradient(circle at 20% 80%, rgba(0, 188, 212, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(13, 71, 161, 0.1) 0%, transparent 50%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: rgba(13, 71, 161, 0.1);
    color: var(--primary-color);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
    color: var(--text-dark);
}

.hero-content .highlight {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-slogan {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-weight: 600;
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
}

.hero-visual {
    position: relative;
    height: 450px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 动态楼梯 - 全新美观设计 */
.stairs-container {
    position: relative;
    width: 420px;
    height: 500px;
    perspective: 1500px;
}

.stairs {
    position: relative;
    width: 100%;
    height: 100%;
    transform-style: preserve-3d;
    transform: rotateX(35deg) rotateZ(-5deg);
}

.step {
    position: absolute;
    width: 240px;
    height: 65px;
    transform-style: preserve-3d;
}

/* 踏步表面 - 高端大理石纹理效果 */
.step-tread {
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #f5f0e8 0%, #e8e0d5 50%, #ddd5c8 100%);
    border-radius: 4px 4px 0 0;
    box-shadow: 
        inset 0 2px 5px rgba(255,255,255,0.6),
        inset 0 -2px 5px rgba(0,0,0,0.1),
        0 10px 30px rgba(0,0,0,0.25);
    transform: translateZ(30px);
}

/* 踏步表面纹理 */
.step-tread::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    background: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 20px,
            rgba(0,0,0,0.02) 20px,
            rgba(0,0,0,0.02) 21px
        );
    border-radius: 4px 4px 0 0;
}

/* 踏步左侧厚度 */
.step-side-left {
    position: absolute;
    width: 30px;
    height: 100%;
    background: linear-gradient(90deg, #c4b8a8 0%, #a89888 100%);
    left: 0;
    transform-origin: left;
    transform: rotateY(-90deg);
    box-shadow: -5px 0 10px rgba(0,0,0,0.2);
}

/* 踏步右侧厚度 */
.step-side-right {
    position: absolute;
    width: 30px;
    height: 100%;
    background: linear-gradient(90deg, #b8a898 0%, #988878 100%);
    transform-origin: right;
    transform: rotateY(90deg);
}

/* 踏步立面 - 垂直前面 */
.step-riser {
    position: absolute;
    width: 100%;
    height: 30px;
    background: linear-gradient(180deg, #d8d0c0 0%, #b8a898 100%);
    bottom: -30px;
    left: 0;
    transform-origin: top;
    transform: rotateX(-90deg);
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}

/* LED灯带 - 高端设计 */
.led-strip {
    position: absolute;
    left: 10px;
    right: 10px;
    top: 58px;
    height: 5px;
    background: linear-gradient(180deg, #333 0%, #111 100%);
    border-radius: 3px;
    transform: translateZ(31px);
    box-shadow: 0 2px 5px rgba(0,0,0,0.3);
    overflow: hidden;
}

/* LED灯珠发光 */
.led-light {
    position: absolute;
    left: 0;
    top: 1px;
    bottom: 1px;
    background: rgba(255, 220, 180, 0.2);
    border-radius: 2px;
    box-shadow: inset 0 0 3px rgba(0,0,0,0.5);
}

/* 下方踏步光照效果 - 柔和光晕 */
.step-light-beam {
    position: absolute;
    width: 220px;
    height: 70px;
    left: 10px;
    top: 65px;
    background: radial-gradient(ellipse 70% 50% at 50% 0%, 
        rgba(255, 235, 200, 1) 0%,
        rgba(255, 220, 170, 0.6) 25%,
        rgba(255, 200, 140, 0.2) 50%,
        transparent 70%
    );
    opacity: 0;
    pointer-events: none;
    filter: blur(3px);
}

/* 立面反射光 */
.step-riser-glow {
    position: absolute;
    width: 240px;
    height: 30px;
    left: 0;
    top: 65px;
    background: linear-gradient(180deg,
        rgba(255, 230, 190, 0.9) 0%,
        rgba(255, 210, 160, 0.3) 100%
    );
    opacity: 0;
    pointer-events: none;
}

/* 9个楼梯台阶位置 */
.step-1 { bottom: 0; left: 0; }
.step-2 { bottom: 68px; left: 22px; }
.step-3 { bottom: 136px; left: 44px; }
.step-4 { bottom: 204px; left: 66px; }
.step-5 { bottom: 272px; left: 88px; }
.step-6 { bottom: 340px; left: 110px; }
.step-7 { bottom: 408px; left: 132px; }
.step-8 { bottom: 476px; left: 154px; }
.step-9 { bottom: 544px; left: 176px; }

/* 楼梯动画 - 美观流水灯效果 4秒循环 */
.step:nth-child(1) .led-light { animation: stairLight 4s ease-in-out infinite; }
.step:nth-child(1) .step-light-beam { animation: beamLight 4s ease-in-out infinite; }
.step:nth-child(1) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; }

.step:nth-child(2) .led-light { animation: stairLight 4s ease-in-out infinite; animation-delay: 0.2s; }
.step:nth-child(2) .step-light-beam { animation: beamLight 4s ease-in-out infinite; animation-delay: 0.2s; }
.step:nth-child(2) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; animation-delay: 0.2s; }

.step:nth-child(3) .led-light { animation: stairLight 4s ease-in-out infinite; animation-delay: 0.4s; }
.step:nth-child(3) .step-light-beam { animation: beamLight 4s ease-in-out infinite; animation-delay: 0.4s; }
.step:nth-child(3) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; animation-delay: 0.4s; }

.step:nth-child(4) .led-light { animation: stairLight 4s ease-in-out infinite; animation-delay: 0.6s; }
.step:nth-child(4) .step-light-beam { animation: beamLight 4s ease-in-out infinite; animation-delay: 0.6s; }
.step:nth-child(4) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; animation-delay: 0.6s; }

.step:nth-child(5) .led-light { animation: stairLight 4s ease-in-out infinite; animation-delay: 0.8s; }
.step:nth-child(5) .step-light-beam { animation: beamLight 4s ease-in-out infinite; animation-delay: 0.8s; }
.step:nth-child(5) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; animation-delay: 0.8s; }

.step:nth-child(6) .led-light { animation: stairLight 4s ease-in-out infinite; animation-delay: 1s; }
.step:nth-child(6) .step-light-beam { animation: beamLight 4s ease-in-out infinite; animation-delay: 1s; }
.step:nth-child(6) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; animation-delay: 1s; }

.step:nth-child(7) .led-light { animation: stairLight 4s ease-in-out infinite; animation-delay: 1.2s; }
.step:nth-child(7) .step-light-beam { animation: beamLight 4s ease-in-out infinite; animation-delay: 1.2s; }
.step:nth-child(7) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; animation-delay: 1.2s; }

.step:nth-child(8) .led-light { animation: stairLight 4s ease-in-out infinite; animation-delay: 1.4s; }
.step:nth-child(8) .step-light-beam { animation: beamLight 4s ease-in-out infinite; animation-delay: 1.4s; }
.step:nth-child(8) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; animation-delay: 1.4s; }

.step:nth-child(9) .led-light { animation: stairLight 4s ease-in-out infinite; animation-delay: 1.6s; }
.step:nth-child(9) .step-light-beam { animation: beamLight 4s ease-in-out infinite; animation-delay: 1.6s; }
.step:nth-child(9) .step-riser-glow { animation: riserLight 4s ease-in-out infinite; animation-delay: 1.6s; }

/* LED灯点亮动画 - 暖白光 */
@keyframes stairLight {
    0%, 4% {
        background: rgba(255, 220, 180, 0.15);
        box-shadow: inset 0 0 3px rgba(0,0,0,0.5);
    }
    5%, 45% {
        background: rgba(255, 248, 230, 1);
        box-shadow: 
            0 0 20px rgba(255, 248, 230, 1),
            0 0 40px rgba(255, 240, 210, 0.9),
            0 0 60px rgba(255, 230, 190, 0.7),
            inset 0 0 5px rgba(255,255,255,0.8);
    }
    50%, 100% {
        background: rgba(255, 220, 180, 0.15);
        box-shadow: inset 0 0 3px rgba(0,0,0,0.5);
    }
}

/* 光斑照亮动画 */
@keyframes beamLight {
    0%, 4% { opacity: 0; }
    5%, 45% { opacity: 1; }
    50%, 100% { opacity: 0; }
}

/* 立面照亮动画 */
@keyframes riserLight {
    0%, 4% { opacity: 0; }
    5%, 45% { opacity: 0.8; }
    50%, 100% { opacity: 0; }
}

/* 浮动卡片 - 靠近楼梯右侧 */
.card-feature {
    position: absolute;
    background: rgba(255, 255, 255, 0.95);
    padding: 0.6rem 0.9rem;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.15);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    animation: floatSide 2.5s ease-in-out infinite;
    backdrop-filter: blur(10px);
    font-size: 0.85rem;
    z-index: 10;
    border: 1px solid rgba(255,255,255,0.5);
}

.card-feature.card-1 {
    right: -140px;
    top: 15%;
    animation-delay: 0s;
}

.card-feature.card-2 {
    right: -155px;
    top: 45%;
    animation-delay: 0.5s;
}

.card-feature.card-3 {
    right: -140px;
    top: 75%;
    animation-delay: 1s;
}

.card-feature .card-icon {
    font-size: 1.3rem;
}

.card-feature .card-text {
    font-weight: 600;
    color: var(--text-dark);
    font-size: 0.85rem;
    white-space: nowrap;
}

@keyframes floatSide {
    0%, 100% { transform: translateX(0); }
    50% { transform: translateX(-10px); }
}

.scroll-indicator {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--text-light);
    font-size: 0.9rem;
}

.arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--text-light);
    border-bottom: 2px solid var(--text-light);
    transform: rotate(45deg);
    margin: 10px auto 0;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0) rotate(45deg); }
    50% { transform: translateY(10px) rotate(45deg); }
}

/* 区块标题 */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-header p {
    font-size: 1.2rem;
    color: var(--text-light);
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 4rem;
}

.about-card {
    background: var(--gray-100);
    padding: 2rem;
    border-radius: var(--radius-lg);
    margin-bottom: 2rem;
}

.about-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.about-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about-card strong {
    color: var(--primary-color);
}

.advantages h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.advantage-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.advantage-item {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-left: 4px solid var(--primary-color);
}

.adv-icon {
    font-size: 2rem;
}

.adv-content h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.adv-content p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    align-content: start;
}

.stat-card.highlight-card {
    background: linear-gradient(135deg, #ff8c00, #ffa500);
    transform: scale(1.05);
}

.stat-card.highlight-card .stat-label {
    color: white;
    font-weight: 600;
}

.stat-number.big {
    font-size: 2.2rem;
}

.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--white);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.95rem;
    opacity: 0.9;
}

/* 核心技术 */
.technology {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--gray-100) 0%, var(--white) 100%);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.tech-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--gray-200);
}

.tech-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.tech-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.tech-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.tech-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 技术方案 */
.solutions {
    padding: 100px 0;
    background: var(--white);
}

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.solution-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--gray-200);
}

.solution-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.solution-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.solution-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.solution-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 产品系列 */
.products {
    padding: 100px 0;
    background: var(--white);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.product-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid var(--gray-200);
}

.product-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.product-image {
    height: 200px;
    background: linear-gradient(135deg, #e3f2fd, #bbdefb);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-icon {
    font-size: 5rem;
}

.product-info {
    padding: 2rem;
}

.product-info h3 {
    font-size: 1.3rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.product-slogan {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 1rem;
}

.product-features {
    list-style: none;
    margin-bottom: 1.5rem;
}

.product-features li {
    padding: 0.5rem 0;
    color: var(--text-light);
    font-size: 0.95rem;
    padding-left: 1.5rem;
    position: relative;
}

.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 资质荣誉 */
.honors {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--white);
}

.honors .section-header h2,
.honors .section-header p {
    color: var(--white);
}

.honors-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.honor-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform 0.3s;
}

.honor-card:hover {
    transform: translateY(-5px);
    background: rgba(255, 255, 255, 0.15);
}

.honor-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.honor-card h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

.honor-card p {
    font-size: 0.9rem;
    opacity: 0.9;
}

/* 联系我们 */
.contact {
    padding: 100px 0;
    background: var(--gray-100);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

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

.contact-card.qrcode-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.qrcode-small {
    width: 100px;
    height: 100px;
    margin: 1rem 0;
    border-radius: 8px;
    overflow: hidden;
}

.qrcode-small img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.qrcode-text {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.contact-type.highlight {
    background: linear-gradient(135deg, #ff8c00, #ffa500);
}

.contact-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.contact-type {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.contact-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 0.8rem;
}

.contact-item .icon {
    font-size: 1.2rem;
}

.contact-item p {
    color: var(--text-light);
}

.qr-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.qr-code {
    width: 150px;
    height: 150px;
    object-fit: contain;
    margin-bottom: 1rem;
    border-radius: var(--radius);
}

.qr-card p {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* 二维码区域 */
.qrcode-section {
    margin-top: 3rem;
    display: flex;
    justify-content: center;
}

.qrcode-box {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    text-align: center;
}

.qrcode-img {
    width: 180px;
    height: 180px;
    object-fit: contain;
    margin-bottom: 1rem;
    border-radius: var(--radius);
}

.qrcode-box p {
    color: var(--text-light);
    font-size: 0.95rem;
}

.contact-form-card {
    background: var(--white);
    padding: 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.contact-form-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.contact-form .form-group {
    margin-bottom: 1rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    font-size: 12px;
    font-family: inherit;
    transition: border-color 0.3s;
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* 页脚 */
.footer {
    background: var(--gray-800);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-brand .footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 1rem;
}

.footer-brand-logo {
    height: 35px;
    width: auto;
    object-fit: contain;
}

.footer-company-logo {
    height: 25px;
    width: auto;
    object-fit: contain;
    opacity: 0.8;
}

.footer-brand p {
    color: #9ca3af;
    line-height: 1.8;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-column h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-column a {
    display: block;
    color: #9ca3af;
    text-decoration: none;
    margin-bottom: 0.5rem;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #6b7280;
    font-size: 0.9rem;
}

/* AI客服悬浮窗 */
.ai-chat-widget {
    position: fixed;
    bottom: 20px;
    right: 20px;
    left: auto;
    z-index: 9999;
    font-family: inherit;
}

.ai-chat-button {
    background: linear-gradient(135deg, #ff8c00, #ffa500);
    color: white;
    padding: 8px 14px;
    border-radius: 20px;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(255, 140, 0, 0.4);
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    font-weight: 600;
    font-size: 12px;
}

.ai-chat-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 25px rgba(255, 140, 0, 0.5);
}

.ai-chat-button:active {
    transform: translateY(-1px);
}

.ai-icon {
    font-size: 1.3rem;
}

.ai-chat-panel {
    position: absolute;
    bottom: 80px;
    right: 0;
    left: auto;
    width: 380px;
    height: 550px;
    background: white;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    display: none;
    flex-direction: column;
    overflow: hidden;
    animation: slideUp 0.3s ease;
}

.ai-chat-panel.active {
    display: flex;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.ai-chat-header {
    background: linear-gradient(135deg, #ff8c00, #ffa500);
    color: white;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.ai-header-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ai-avatar {
    font-size: 2rem;
}

.ai-title h4 {
    margin: 0;
    font-size: 1.1rem;
}

.ai-status {
    font-size: 0.8rem;
    opacity: 0.9;
    display: flex;
    align-items: center;
    gap: 5px;
}

.ai-status::before {
    content: '';
    width: 8px;
    height: 8px;
    background: #4ade80;
    border-radius: 50%;
    display: inline-block;
}

.ai-close-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.ai-close-btn:hover {
    background: rgba(255, 255, 255, 0.3);
}

.ai-chat-messages {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: #f8f9fa;
}

.ai-message {
    margin-bottom: 15px;
    animation: fadeIn 0.3s ease;
}

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

.ai-welcome .ai-message-content {
    background: white;
    padding: 15px;
    border-radius: 15px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.ai-welcome .ai-message-content p {
    margin: 8px 0;
    color: var(--text-dark);
    line-height: 1.6;
}

.ai-welcome .ai-message-content ul {
    margin: 10px 0;
    padding-left: 20px;
    color: var(--text-light);
}

.ai-welcome .ai-message-content li {
    margin: 5px 0;
}

.ai-chat-input-area {
    padding: 15px 20px;
    background: white;
    border-top: 1px solid #eee;
}

.ai-input-wrap {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.ai-chat-input {
    flex: 1;
    padding: 12px 18px;
    border: 2px solid #e5e7eb;
    border-radius: 25px;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.3s;
}

.ai-chat-input:focus {
    border-color: #ff8c00;
}

.ai-send-btn {
    background: linear-gradient(135deg, #ff8c00, #ffa500);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s;
}

.ai-send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(255, 140, 0, 0.3);
}

.ai-contact-toggle {
    width: 100%;
    background: transparent;
    border: 2px dashed #ddd;
    padding: 10px;
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-light);
    font-size: 0.9rem;
    transition: all 0.3s;
}

.ai-contact-toggle:hover {
    border-color: #ff8c00;
    color: #ff8c00;
}

.ai-contact-form {
    background: #f8f9fa;
    padding: 15px;
    border-radius: 15px;
    margin-bottom: 10px;
}

.ai-form-title {
    font-size: 0.9rem;
    color: var(--text-dark);
    margin-bottom: 12px;
    font-weight: 600;
}

.ai-contact-form input,
.ai-contact-form textarea {
    width: 100%;
    padding: 10px 15px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-size: 0.9rem;
    outline: none;
}

.ai-contact-form input:focus,
.ai-contact-form textarea:focus {
    border-color: #ff8c00;
}

.ai-contact-form textarea {
    min-height: 60px;
    resize: vertical;
}

/* AI加载动画 */
.ai-loading {
    display: flex;
    gap: 6px;
    padding: 10px 0;
}

.ai-loading span {
    width: 8px;
    height: 8px;
    background: #ff8c00;
    border-radius: 50%;
    animation: aiLoading 1.4s ease-in-out infinite;
}

.ai-loading span:nth-child(1) { animation-delay: 0s; }
.ai-loading span:nth-child(2) { animation-delay: 0.2s; }
.ai-loading span:nth-child(3) { animation-delay: 0.4s; }

@keyframes aiLoading {
    0%, 80%, 100% { transform: scale(0.6); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* AI消息样式优化 */
.ai-message {
    margin-bottom: 15px;
    animation: fadeIn 0.3s ease;
}

.ai-message.user {
    text-align: right;
}

.ai-message.user .ai-message-content {
    background: linear-gradient(135deg, #0d47a1, #1565c0);
    color: white;
    display: inline-block;
    border-radius: 18px 18px 4px 18px;
}

.ai-message.ai .ai-message-content {
    background: #f0f2f5;
    color: var(--text-dark);
    display: inline-block;
    border-radius: 18px 18px 18px 4px;
}

.ai-message-content {
    padding: 12px 16px;
    max-width: 85%;
    word-wrap: break-word;
}

.ai-message-content p {
    margin: 0;
    line-height: 1.5;
}

.ai-form-buttons {
    display: flex;
    gap: 10px;
}

.ai-btn-primary,
.ai-btn-secondary {
    flex: 1;
    padding: 10px;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.ai-btn-primary {
    background: linear-gradient(135deg, #ff8c00, #ffa500);
    color: white;
    border: none;
}

.ai-btn-primary:hover {
    transform: scale(1.02);
}

.ai-btn-secondary {
    background: transparent;
    color: var(--text-dark);
    border: 2px solid #ddd;
}

.ai-btn-secondary:hover {
    border-color: #ff8c00;
    color: #ff8c00;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        order: 1;
    }

    .hero-visual {
        order: 0;
        height: 300px;
    }

    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-buttons {
        justify-content: center;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

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

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

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

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

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

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

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

    .qrcode-small {
        width: 80px;
        height: 80px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        background: var(--white);
        flex-direction: column;
        padding: 1rem;
        box-shadow: var(--shadow);
    }

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

    .hamburger {
        display: flex;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

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

    .stat-card.highlight-card {
        transform: scale(1);
    }

    .stat-number.big {
        font-size: 1.8rem;
    }

    .tech-grid,
    .solutions-grid,
    .product-grid,
    .honors-grid {
        grid-template-columns: 1fr;
    }

    .lang-dropbtn {
        padding: 12px 24px;
        font-size: 12px;
        min-width: 110px;
    }
    
    .lang-dropdown-content {
        min-width: 160px;
        right: 50%;
        transform: translateX(50%) translateY(-10px);
    }
    
    .lang-dropdown-content.show {
        transform: translateX(50%) translateY(0);
    }
    
    .lang-dropdown-content a {
        padding: 16px 24px;
        font-size: 12px;
    }
    
    .lang-switch {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        margin-top: 1rem;
    }
    
    .lang-dropdown {
        margin-top: 1rem;
    }
    
    .lang-dropdown-content {
        right: auto;
        left: 0;
    }
    
    .brand-logo {
        height: 32px;
    }
    
    .company-logo {
        height: 24px;
        margin-left: 5px;
    }
    
    .qrcode-img {
        width: 150px;
        height: 150px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    /* 移动端楼梯适配 - 9个台阶 */
    .stairs-container {
        width: 320px;
        height: 400px;
    }

    .stairs {
        transform: rotateX(30deg) rotateZ(-3deg);
    }

    .step {
        width: 180px;
        height: 50px;
    }

    .step-side-left,
    .step-side-right {
        width: 20px;
    }

    .step-riser {
        height: 22px;
        bottom: -22px;
    }

    .led-strip {
        left: 8px;
        right: 8px;
        top: 45px;
        height: 4px;
    }

    .step-light-beam {
        width: 165px;
        height: 55px;
        left: 7px;
        top: 50px;
    }

    .step-riser-glow {
        width: 180px;
        height: 22px;
        top: 50px;
    }

    .step-1 { bottom: 0; left: 0; }
    .step-2 { bottom: 54px; left: 16px; }
    .step-3 { bottom: 108px; left: 32px; }
    .step-4 { bottom: 162px; left: 48px; }
    .step-5 { bottom: 216px; left: 64px; }
    .step-6 { bottom: 270px; left: 80px; }
    .step-7 { bottom: 324px; left: 96px; }
    .step-8 { bottom: 378px; left: 112px; }
    .step-9 { bottom: 432px; left: 128px; }

    .card-feature {
        padding: 0.4rem 0.6rem;
        font-size: 0.7rem;
    }

    .card-feature .card-icon {
        font-size: 12px;
    }

    .card-feature .card-text {
        font-size: 0.65rem;
    }

    .card-feature.card-1 {
        right: -90px;
        top: 15%;
    }

    .card-feature.card-2 {
        right: -100px;
        top: 45%;
    }

    .card-feature.card-3 {
        right: -90px;
        top: 75%;
    }

    .card-feature.card-3 {
        top: 170px;
        right: -10px;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }

    .floating-card {
        position: relative;
        margin-bottom: 1rem;
        animation: none;
    }

    .light-effect {
        display: none;
    }


.contact-float-btn:hover {
    padding-right: 20px;
    box-shadow: -4px 4px 15px rgba(0,0,0,0.3);
}
.contact-float-btn .icon {
    font-size: 20px;
}
@media (max-width: 768px) {
    .contact-float-btn {
        padding: 12px 15px;
        font-size: 12px;
    }
    .contact-float-btn .text {
        display: none;
    }
}
.ai-contact-quick:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(238, 90, 90, 0.5);
}
.ai-contact-quick .icon {
    font-size: 18px;
}
@media (max-width: 768px) {
    .ai-contact-quick {
        right: 10px;
        bottom: 90px;
        padding: 10px 15px;
        font-size: 12px;
    }
    .ai-contact-quick .text {
        display: none;
    }
}

/* 语言切换下拉菜单修复 */
.lang-dropdown {
    position: relative;
    display: inline-block;
    z-index: 10000;
}

.lang-dropbtn {
    position: relative;
    z-index: 10001;
    cursor: pointer;
}

.lang-dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    margin-top: 8px;
    background: white;
    min-width: 140px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    border-radius: 8px;
    z-index: 10002;
    overflow: hidden;
}

.lang-dropdown-content.show {
    display: block !important;
}

.lang-dropdown-content a {
    display: block;
    padding: 12px 20px;
    color: #333;
    text-decoration: none;
    font-weight: 500;
    cursor: pointer;
    pointer-events: auto;
}

.lang-dropdown-content a:hover {
    background: #f0f0f0;
    color: #0d47a1;
}