/* ===================================
   全局样式重置与基础设置
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #7c3aed;
    --primary-light: #a78bfa;
    --primary-dark: #5b21b6;
    --accent: #06b6d4;
    --accent-light: #67e8f9;
    --surface: #0f172a;
    --surface-light: #1e293b;
    --text-dark: #1e1b4b;
    --text-gray: #64748b;
    --text-light: #94a3b8;
    --white: #ffffff;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.25rem;
    --font-2xl: 1.5rem;
    --font-3xl: 1.875rem;
    --font-4xl: 2.25rem;
    --font-5xl: 3rem;

    --transition: all 0.3s ease;
    --radius: 16px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif, 'Arabic UI Text', 'Geeza Pro';
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
}

body[dir="rtl"] {
    direction: rtl;
    text-align: right;
}

body[dir="rtl"] .nav-menu {
    flex-direction: row-reverse;
}

body[dir="rtl"] ul {
    padding-right: 2rem;
    padding-left: 0;
}

/* ===================================
   容器
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===================================
   固定顶部导航栏
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
}

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

.nav-brand {
    font-size: var(--font-sm);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.08em;
}

.nav-menu {
    display: flex;
    list-style: none;
    align-items: center;
    gap: var(--spacing-lg);
}

.nav-menu li a {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-sm);
    font-weight: 500;
    transition: var(--transition);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 8px;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    color: var(--white);
    background-color: rgba(124, 58, 237, 0.2);
}

.lang-switcher {
    margin-left: var(--spacing-sm);
}

.lang-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    padding: var(--spacing-xs) var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-sm);
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.7);
}

.lang-btn:hover {
    border-color: var(--primary-light);
    background-color: rgba(124, 58, 237, 0.15);
}

.lang-option {
    cursor: pointer;
    padding: 0 0.25rem;
    transition: var(--transition);
    color: rgba(255, 255, 255, 0.6);
}

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

.lang-separator {
    color: rgba(255, 255, 255, 0.3);
}

/* ===================================
   Hero 区域
   =================================== */
.hero {
    margin-top: 56px;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 40%, #312e81 70%, #4c1d95 100%);
    min-height: 520px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 700px;
    height: 700px;
    background: radial-gradient(circle, rgba(6, 182, 212, 0.15) 0%, transparent 60%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.2) 0%, transparent 60%);
    border-radius: 50%;
    pointer-events: none;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-30px) scale(1.05); }
}

.hero-background {
    background-image: none;
    padding: var(--spacing-2xl) 0;
    min-height: 520px;
    display: flex;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-xl);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 0%, var(--accent-light) 50%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.15;
    flex: 1;
    letter-spacing: 0.02em;
}

.hero-subtitle {
    margin-top: 1.2rem;
    font-size: 1.1rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.55);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.hero-icon {
    flex: 0 0 220px;
}

.hero-icon svg {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 0 40px rgba(6, 182, 212, 0.3)) drop-shadow(0 0 80px rgba(124, 58, 237, 0.2));
}

/* ===================================
   About Us 区域
   =================================== */
.about {
    padding: 5rem 0;
    background-color: var(--white);
}

.section-title {
    font-size: var(--font-4xl);
    font-weight: 800;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    letter-spacing: -0.02em;
}

.about-text {
    font-size: var(--font-lg);
    color: var(--text-gray);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.9;
}

/* ===================================
   Products 区域
   =================================== */
.products {
    padding: 5rem 0;
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.product-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: var(--spacing-xl);
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.04);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 6px 24px rgba(0, 0, 0, 0.04);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: var(--transition);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(124, 58, 237, 0.12), 0 4px 12px rgba(0, 0, 0, 0.06);
}

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

.product-image {
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.product-image img {
    width: 100%;
    max-width: 280px;
    height: auto;
    border-radius: 12px;
    object-fit: cover;
}

.product-image svg {
    width: 100%;
    max-width: 250px;
    height: auto;
    margin: 0 auto;
}

.product-title {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-dark);
}

/* ===================================
   页面内容区域（用于协议和联系页面）
   =================================== */
.page-content {
    margin-top: 80px;
    padding: var(--spacing-2xl) 0;
    min-height: calc(100vh - 200px);
}

.page-title {
    font-size: var(--font-4xl);
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xl);
}

.content-section {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

.content-section h2 {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--text-dark);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.content-section h3 {
    font-size: var(--font-xl);
    font-weight: 600;
    color: var(--text-dark);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.content-section p {
    font-size: var(--font-base);
    color: var(--text-gray);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.content-section ul {
    margin: var(--spacing-md) 0;
    padding-left: 2rem;
}

.content-section li {
    font-size: var(--font-base);
    color: var(--text-gray);
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.update-date {
    font-size: var(--font-sm);
    color: var(--text-light);
    font-style: italic;
    margin-bottom: var(--spacing-lg);
}

/* ===================================
   联系页面特殊样式
   =================================== */
.contact-section {
    max-width: 1200px;
    margin: 0 auto;
}

.contact-intro {
    font-size: var(--font-lg);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.contact-info h2 {
    margin-top: 0;
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.contact-icon {
    flex: 0 0 50px;
    height: 50px;
    background: linear-gradient(135deg, rgba(124, 58, 237, 0.1), rgba(6, 182, 212, 0.1));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.contact-icon svg {
    width: 24px;
    height: 24px;
}

.contact-details h3 {
    margin: 0 0 var(--spacing-xs) 0;
    font-size: var(--font-lg);
}

.contact-details p {
    margin: var(--spacing-xs) 0;
    font-size: var(--font-base);
}

.contact-details a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.contact-details a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

.contact-form-wrapper h2 {
    margin-top: 0;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-size: var(--font-sm);
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: var(--font-base);
    font-family: inherit;
    transition: var(--transition);
    background: var(--light-bg);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
    background: var(--white);
}

.form-group textarea {
    resize: vertical;
}

.submit-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    border: none;
    padding: var(--spacing-sm) var(--spacing-xl);
    border-radius: 10px;
    font-size: var(--font-base);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    align-self: flex-start;
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.35);
}

.additional-info {
    margin-top: var(--spacing-2xl);
}

.additional-info h2 {
    margin-top: 0;
    text-align: center;
}

.additional-info > p {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
}

.info-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.info-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.info-card:hover {
    border-color: rgba(124, 58, 237, 0.2);
    box-shadow: 0 4px 16px rgba(124, 58, 237, 0.08);
}

.info-card h3 {
    font-size: var(--font-lg);
    margin: 0 0 var(--spacing-sm) 0;
}

.info-card p {
    font-size: var(--font-sm);
    margin-bottom: var(--spacing-sm);
}

.info-card a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-base);
}

.info-card a:hover {
    text-decoration: underline;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--surface);
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer p {
    font-size: var(--font-sm);
    color: rgba(255, 255, 255, 0.5);
    margin: 0;
}

/* ===================================
   响应式设计
   =================================== */

@media (min-width: 1920px) {
    .container {
        max-width: 1400px;
    }
}

@media (max-width: 1440px) {
    .hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 1024px) {
    .container {
        padding: 0 var(--spacing-md);
    }

    .nav-menu {
        gap: var(--spacing-md);
    }

    .nav-menu li a {
        font-size: var(--font-xs);
        padding: var(--spacing-xs);
    }

    .nav-brand {
        font-size: var(--font-xs);
        max-width: 200px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-icon {
        flex: 0 0 150px;
    }

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

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

    .info-cards {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-5xl: 2rem;
        --font-4xl: 1.75rem;
        --font-3xl: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
    }

    .navbar .container {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-xs);
    }

    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-icon {
        flex: 0 0 120px;
    }

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

    .section-title {
        font-size: var(--font-3xl);
    }

    .about-text {
        font-size: var(--font-base);
    }

    .contact-item {
        flex-direction: column;
        text-align: center;
    }

    .contact-icon {
        margin: 0 auto;
    }

    .submit-btn {
        width: 100%;
        align-self: stretch;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.5rem;
    }

    .content-section {
        padding: var(--spacing-md);
    }

    .page-title {
        font-size: var(--font-2xl);
    }
}