/* Modern CSS Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-blue: #2563eb;
    --primary-purple: #7c3aed;
    --accent-orange: #f97316;
    --accent-green: #10b981;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --text-white: #ffffff;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

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

/* Modern Navigation */
.navbar {
    background: linear-gradient(135deg, var(--primary-blue), #64748b);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
}

.navbar-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

.navbar-logo img {
    height: 44px;
    width: auto;
    transition: var(--transition);
}

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

.navbar-list {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.navbar-list a {
    text-decoration: none;
    color: var(--text-white);
    font-weight: 500;
    font-size: 1rem;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
}

.navbar-list a:hover {
    color: var(--text-white);
    transform: translateY(-1px);
}

.navbar-list a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    background: var(--accent-orange);
    transition: var(--transition);
    border-radius: 2px;
}

.navbar-list a:hover::after {
    width: 100%;
    left: 0;
}

.hamburger-menu {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.hamburger-menu:hover {
    background: rgba(255, 255, 255, 0.1);
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: var(--text-white);
    padding: 8rem 5% 6rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Modern Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--accent-orange);
    color: var(--text-white);
}

.btn-primary:hover {
    background: #ea580c;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    text-decoration: none;
}

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

.btn-secondary:hover {
    background: var(--text-white);
    color: var(--primary-blue);
    transform: translateY(-2px);
    text-decoration: none;
}

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

.btn-outline:hover {
    background: var(--primary-blue);
    color: var(--text-white);
    text-decoration: none;
}

/* Trusted By Section */
.trusted-by {
    padding: 4rem 5%;
    background: var(--bg-light);
}

.trusted-by h2 {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-light);
    font-size: 1.125rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.customer-logos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
    align-items: center;
    justify-items: center;
}

.customer-logos img {
    max-width: 100%;
    height: auto;
    opacity: 0.7;
    transition: var(--transition);
    filter: grayscale(100%);
}

.customer-logos img:hover {
    opacity: 1;
    filter: grayscale(0%);
}

/* Features Section */
.features {
    padding: 6rem 5%;
}

.features h2 {
    text-align: center;
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: 4rem;
    color: var(--text-dark);
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 6rem;
}

.feature-grid:nth-child(even) {
    direction: rtl;
}

.feature-grid:nth-child(even) > * {
    direction: ltr;
}

.feature-content h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.feature-content p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
    color: var(--text-light);
}

.feature-image img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

/* Stats Section */
.stats {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: var(--text-white);
    padding: 6rem 5%;
    text-align: center;
}

.stats h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: 2rem;
}

.stats p {
    font-size: 1.25rem;
    margin-bottom: 3rem;
    opacity: 0.9;
}

.stats .rating {
    margin-bottom: 2rem;
}

.stats .rating img {
    width: 30px;
    height: auto;
    margin: 0 2px;
}

.testimonial {
    font-style: italic;
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.author {
    font-weight: 600;
    margin-top: 1rem;
}

/* Capabilities Section */
.capabilities {
    padding: 6rem 5%;
    background: var(--bg-light);
}

.capabilities h2 {
    text-align: center;
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: 4rem;
}

.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.capability-card {
    background: var(--bg-white);
    padding: 2.5rem 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.capability-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--primary-purple));
}

.capability-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    text-align: center;
    line-height: 1;
}

.capability-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary-blue);
    text-align: center;
    font-weight: 600;
}

.capability-card ul {
    list-style: none;
}

.capability-card li {
    padding: 0.7rem 0;
    color: var(--text-light);
    position: relative;
    padding-left: 2rem;
    font-size: 1rem;
    line-height: 1.5;
}

.capability-card li::before {
    content: "✓";
    color: var(--accent-green);
    position: absolute;
    left: 0;
    font-weight: bold;
    font-size: 1.1rem;
}

/* Resources Section */
.resources {
    padding: 6rem 5%;
    background: var(--bg-light);
}

.resources h2 {
    text-align: center;
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: 4rem;
}

.resources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.resource-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.resource-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.resource-card img {
    max-width: 100%;
    height: auto;
    margin-bottom: 1.5rem;
}

.resource-card h3 {
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.resource-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.resource-card a {
    color: var(--primary-blue);
    text-decoration: none;
    font-weight: 600;
}

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

/* CTA Section */
.cta {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: var(--text-white);
    text-align: center;
    padding: 6rem 5%;
}

.cta h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: 1.5rem;
}

.cta p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Contact Section */
.contact {
    padding: 6rem 5%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-form h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-message {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    display: none;
}

.message-success {
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.message-error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.contact-image img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
    background: var(--text-dark);
    color: var(--text-white);
}

.footer-inner {
    text-align: center;
    padding: 3rem 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.footer a {
    color: var(--text-white);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--primary-blue);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    cursor: pointer;
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

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

.back-to-top:hover {
    background: var(--primary-purple);
    transform: translateY(-3px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-inner {
        padding: 0.5rem 1rem;
    }

    .navbar-list {
        position: fixed;
        top: 70px;
        right: 20px;
        width: 280px;
        background: linear-gradient(135deg, var(--primary-blue), #64748b);
        flex-direction: column;
        align-items: flex-start;
        padding: 1.5rem 0;
        box-shadow: var(--shadow-lg);
        border-radius: 16px;
        transform: translateY(-20px);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 999;
        backdrop-filter: blur(10px);
    }

    .navbar-list.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .navbar-list li {
        width: 100%;
        text-align: left;
        padding: 0.75rem 1.5rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        transition: var(--transition);
    }

    .navbar-list li:last-child {
        border-bottom: none;
    }

    .navbar-list li:hover {
        background: rgba(255, 255, 255, 0.1);
    }

    .navbar-list a {
        font-size: 1.1rem;
        padding: 0.25rem 0;
        display: block;
        width: 100%;
        border-radius: 8px;
        transition: var(--transition);
    }

    .navbar-list li:last-child {
        border-bottom: none;
    }

    .navbar-list a {
        font-size: 1rem;
        padding: 8px 0;
        display: block;
        color: white;
        text-align: left;
        transition: background-color 0.3s;
        width: 100%;
    }

    .navbar-list a:hover {
        background-color: rgba(255, 255, 255, 0.1);
        color: white;
        transform: none;
    }

    .navbar-list a::after {
        display: none;
    }

    .hamburger-menu {
        display: flex;
    }

    .hamburger-menu.active span:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .hamburger-menu.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger-menu.active span:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .feature-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .customer-logos {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
}

@media (max-width: 480px) {
    .navbar-inner {
        padding: 0.3rem 0.8rem;
    }

    .navbar-list {
        top: 50px;
        right: 5px;
        width: 180px;
    }

    .navbar-list li {
        padding: 10px 15px;
    }

    .navbar-list a {
        font-size: 0.9rem;
        padding: 6px 0;
    }

    .hero {
        padding: 6rem 5% 4rem;
    }

    .btn {
        display: block;
        width: 100%;
        margin-bottom: 1rem;
        text-align: center;
    }

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

/* Trial Benefits Section */
.trial-benefits {
    padding: 4rem 5%;
    background-color: var(--background-light);
    text-align: center;
}

.trial-benefits h2 {
    font-size: 2.5rem;
    color: var(--primary-blue);
    margin-bottom: 3rem;
    font-weight: 600;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.benefit-card {
    background: var(--text-white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
}

.benefit-card h3 {
    color: var(--primary-blue);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.benefit-card p {
    color: var(--text-gray);
    line-height: 1.6;
    font-size: 1.1rem;
}

.terms-text {
    margin-top: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.terms-text p {
    font-size: 0.9rem;
    color: var(--text-gray);
    line-height: 1.5;
    margin: 0.5rem 0;
}

.terms-text a {
    color: var(--primary-blue);
    text-decoration: none;
}

.terms-text a:hover {
    text-decoration: underline;
}

/* Mobile responsive for trial benefits */
@media (max-width: 768px) {
    .trial-benefits {
        padding: 3rem 5%;
    }

    .trial-benefits h2 {
        font-size: 2rem;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .wechat-section {
            margin-top: 2rem;
            text-align: center;
            padding-top: 2rem;
            border-top: 1px solid #e5e7eb;
        }
        .wechat-section h3 {
            color: var(--primary-blue);
            margin-bottom: 1rem;
            font-size: 1.3rem;
        }
        .wechat-images {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: nowrap;
        }
        .wechat-image {
            text-align: center;
        }
        .wechat-image img {
            max-width: 150px;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }
        .wechat-image p {
            margin-top: 0.5rem;
            color: var(--text-gray);
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            .wechat-images {
                gap: 1rem;
            }
            .wechat-image img {
                max-width: 120px;
            }
        }    
}