/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --bg-light: #f8fafc;
    --white: #ffffff;
    --success: #10b981;
    --error: #ef4444;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

html {
    scroll-behavior: smooth;
}

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

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

/* Header and Navigation */
header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-img {
    width: 35px;
    height: 35px;
    border-radius: 8px;
    object-fit: cover;
}

.logo h1 {
    font-size: 1.75rem;
    color: var(--primary-color);
    font-weight: 700;
}

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

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

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

.lang-btn {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 8px 16px;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 120px 0;
    text-align: center;
}

.hero-content h2 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background-color: var(--white);
    color: var(--text-dark);
    padding: 14px 28px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.btn-download:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* Sections */
section {
    padding: 80px 0;
}

section h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.section-subtitle {
    text-align: center;
    font-size: 1.125rem;
    color: var(--text-light);
    margin-bottom: 3rem;
}

/* Features Section */
.features {
    background-color: var(--bg-light);
}

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

.feature-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.feature-card .icon {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Pricing/Comparison Section */
.pricing {
    background-color: var(--white);
}

.comparison-table {
    max-width: 900px;
    margin: 0 auto;
    overflow-x: auto;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.comparison-table thead {
    background-color: var(--primary-color);
    color: var(--white);
}

.comparison-table th {
    padding: 1.25rem;
    text-align: center;
    font-weight: 600;
    font-size: 1.125rem;
}

.comparison-table th.highlighted {
    background-color: var(--secondary-color);
}

.comparison-table tbody td:nth-child(3) {
    background-color: #f3e8ff;
}

.comparison-table td {
    padding: 1rem 1.25rem;
    text-align: center;
    border-bottom: 1px solid #e2e8f0;
}

.comparison-table tbody tr:last-child td {
    border-bottom: none;
}

.comparison-table tbody tr:nth-child(even) {
    background-color: var(--bg-light);
}

.comparison-table td:first-child {
    text-align: left;
    font-weight: 500;
}

.check {
    color: var(--success);
    font-size: 1.5rem;
    font-weight: bold;
}

.cross {
    color: var(--error);
    font-size: 1.5rem;
    font-weight: bold;
}

/* Reviews Section */
.reviews {
    background-color: var(--bg-light);
}

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

.review-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

.review-card:hover {
    transform: translateY(-5px);
}

.stars {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: #fbbf24;
}

.review-text {
    color: var(--text-dark);
    font-style: italic;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.reviewer {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.reviewer strong {
    color: var(--text-dark);
    font-size: 1.125rem;
}

.reviewer span {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* FAQ Section */
.faq {
    background-color: var(--white);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1rem;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    width: 100%;
    background-color: var(--white);
    border: none;
    padding: 1.25rem 1.5rem;
    text-align: left;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s;
}

.faq-question:hover {
    background-color: var(--bg-light);
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary-color);
    transition: transform 0.3s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out, padding 0.3s ease-out;
    background-color: var(--bg-light);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 1.25rem 1.5rem;
}

.faq-answer p {
    color: var(--text-dark);
    line-height: 1.7;
    margin: 0;
}

/* Footer */
footer {
    background-color: var(--text-dark);
    color: var(--white);
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-branding {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.footer-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    object-fit: cover;
}

.footer-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s;
    opacity: 1;
}

.footer-links a:hover {
    color: var(--primary-color);
    opacity: 1;
}

.footer-copyright {
    margin: 0;
    opacity: 0.7;
    font-size: 0.9rem;
}

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

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

    .nav-links li {
        width: 100%;
        text-align: center;
        padding: 0.75rem 20px;
    }

    .hamburger {
        display: flex;
    }

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

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero {
        padding: 80px 0;
    }

    .hero-content h2 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn-download {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }

    section {
        padding: 60px 0;
    }

    section h2 {
        font-size: 2rem;
    }

    .features-grid,
    .reviews-grid {
        grid-template-columns: 1fr;
    }

    .comparison-table {
        font-size: 0.9rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 0.75rem;
    }

    .footer-links {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .logo-img {
        width: 30px;
        height: 30px;
    }
}

/* Scroll Animation */
section {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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