/* ===== 全局重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111927;
    --bg-card: rgba(255, 255, 255, 0.04);
    --bg-card-hover: rgba(255, 255, 255, 0.07);
    --border-color: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);
    --text-primary: #e8edf5;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    --blue: #3b82f6;
    --blue-light: #60a5fa;
    --purple: #8b5cf6;
    --gradient: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --radius: 16px;
    --radius-lg: 24px;
    --transition: 0.25s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, system-ui, sans-serif;
    /* 背景提亮：从 #111927 → #1a2744 */
    background: radial-gradient(ellipse at 50% 0%, #1a2744, #0f1626 70%);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

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

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

img {
    max-width: 100%;
    display: block;
}

/* ===== 语言栏 ===== */
.lang-bar {
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border-color);
    padding: 0.4rem 0;
    font-size: 0.8rem;
    text-align: right;
}

.lang-bar .container {
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
    align-items: center;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8rem;
    padding: 0.15rem 0.4rem;
    transition: var(--transition);
    font-weight: 500;
}

.lang-btn:hover {
    color: var(--text-primary);
}

.lang-btn.active {
    color: var(--blue-light);
    font-weight: 600;
}

.lang-divider {
    color: var(--text-muted);
    font-weight: 300;
}

/* ===== 导航栏 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.8rem 0;
}

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

.nav-left {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    font-size: 1.3rem;
}

.logo img {
    height: 32px;
    width: auto;
}

.logo-text {
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.8rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient);
    transition: var(--transition);
}

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

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

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

.btn-alibaba {
    background: var(--gradient);
    color: white !important;
    padding: 0.5rem 1.2rem;
    border-radius: 40px;
    font-weight: 600;
    font-size: 0.85rem;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-alibaba:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
    color: white !important;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.3rem;
}

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

/* ===== Hero ===== */
.hero {
    padding: 4rem 0 3rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-badge {
    display: inline-block;
    background: rgba(59, 130, 246, 0.12);
    color: var(--blue-light);
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    border: 1px solid rgba(59, 130, 246, 0.1);
    margin-bottom: 0.8rem;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 1rem;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 480px;
    margin-bottom: 1.8rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.btn-primary {
    background: var(--gradient);
    color: white !important;
    padding: 0.8rem 2rem;
    border-radius: 40px;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
    color: white !important;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    padding: 0.8rem 2rem;
    border-radius: 40px;
    font-weight: 600;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
    display: inline-block;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.hero-stats .stat {
    display: flex;
    flex-direction: column;
}

.hero-stats .stat .num {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.hero-stats .stat .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.hero-image-placeholder {
    background: linear-gradient(145deg, #111927, #0a0e1a);
    border-radius: var(--radius-lg);
    padding: 2rem;
    border: 1px solid var(--border-color);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 320px;
    transition: var(--transition);
}

.hero-image-placeholder:hover {
    border-color: var(--border-hover);
}

.hero-image-placeholder img {
    max-width: 100%;
    max-height: 340px;   /* 从 260px 改大 */
    object-fit: contain;
}

.hero-image-tag {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.5px;
}

/* ===== 通用区块标题 ===== */
.section-header {
    text-align: center;
    margin-bottom: 2.5rem;
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

/* ===== 参数 ===== */
.params {
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.params-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1.2rem;
}

.param-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.5rem 1rem;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.param-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.param-icon {
    font-size: 1.8rem;
    margin-bottom: 0.3rem;
    display: block;
}

.param-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.param-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.1rem;
}

/* ===== 特点 ===== */
.features {
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.8rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.feature-icon {
    width: 44px;
    height: 44px;
    color: var(--blue-light);
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    stroke-width: 1.8;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.3rem;
}

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

/* ===== 应用场景 ===== */
.scenes {
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.scenes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.scene-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 1.8rem 1.2rem;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.scene-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.scene-img {
    width: 100%;
    height: 180px;       /* 从 140px 改大 */
    object-fit: cover;
    border-radius: 8px;
    margin-bottom: 0.8rem;
    background: var(--bg-secondary);
}

.scene-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 0.2rem;
}

.scene-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* ===== 联系 ===== */
.contact {
    padding: 4rem 0;
    border-top: 1px solid var(--border-color);
}

.contact-box {
    background: linear-gradient(145deg, #111927, #0a0e1a);
    border-radius: var(--radius-lg);
    padding: 3rem;
    border: 1px solid var(--border-color);
    text-align: center;
}

.contact-content h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.contact-content p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 1.5rem;
}

.contact-info {
    display: flex;
    justify-content: center;
    gap: 2.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.8rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.contact-item .contact-icon {
    color: var(--blue-light);
}

.btn-alibaba-large {
    display: inline-block;
    background: var(--gradient);
    color: white !important;
    padding: 1rem 2.8rem;
    border-radius: 40px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
}

.btn-alibaba-large:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(59, 130, 246, 0.35);
    color: white !important;
}

/* ===== 页脚 ===== */
.footer {
    padding: 2.5rem 0 1.5rem;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo {
    font-size: 1.2rem;
    font-weight: 700;
    display: block;
    margin-bottom: 0.3rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.footer-ali-link {
    font-weight: 600;
    color: var(--blue-light);
    font-size: 1rem;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1.2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.footer-bottom a {
    color: var(--text-muted);
}

.footer-bottom a:hover {
    color: var(--text-secondary);
}