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

:root {
    --primary-color: #7C3AED;
    --secondary-color: #3B82F6;
    --text-color: #333;
    --text-light: #666;
    --bg-color: #ffffff;
    --bg-light: #f5f3ff;
    --bg-dark: #1a1a2e;
    --border-color: #e0e0e0;
    --shadow: 0 2px 10px rgba(124, 58, 237, 0.12);
    --shadow-lg: 0 10px 30px rgba(124, 58, 237, 0.2);
    --transition: all 0.3s ease;
}

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

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

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

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
    font-weight: 700;
}

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

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

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

.nav-menu a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    gap: 4px;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    background: linear-gradient(135deg, #fff 0%, #f0ebff 100%);
}

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

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    line-height: 1.8;
}

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

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-placeholder,
.feature-placeholder {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 1;
}

.hero-placeholder svg,
.feature-placeholder svg {
    width: 100%;
    height: 100%;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* Features Preview */
.features-preview {
    padding: 5rem 0;
    background: var(--bg-light);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-color);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

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

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

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

.feature-card p {
    color: var(--text-light);
    line-height: 1.6;
}

/* Page Header */
.page-header {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    text-align: center;
    color: #ffffff;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.page-header p {
    font-size: 1.25rem;
    opacity: 0.9;
}

/* Features Detailed */
.features-detailed {
    padding: 5rem 0;
}

.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 5rem;
}

.feature-detail.reverse {
    direction: rtl;
}

.feature-detail.reverse > * {
    direction: ltr;
}

.feature-number {
    font-size: 4rem;
    font-weight: 800;
    color: var(--primary-color);
    opacity: 0.3;
    margin-bottom: 1rem;
}

.feature-detail-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-detail-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    padding: 0.5rem 0;
    color: var(--text-light);
    font-size: 1.05rem;
}

/* Additional Features */
.additional-features {
    padding: 5rem 0;
    background: var(--bg-light);
}

/* CTA Section */
.cta {
    padding: 5rem 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    text-align: center;
}

.cta .btn-primary {
    background: #ffffff;
    color: var(--primary-color);
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #ffffff;
}

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

/* Contact Section */
.contact {
    padding: 5rem 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    margin-top: 2rem;
}

.contact-info h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

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

.contact-details {
    margin-top: 2rem;
}

.contact-details p {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

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

.contact-form input,
.contact-form textarea {
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
}

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

.contact-form textarea {
    resize: vertical;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: #fff;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
    transition: var(--transition);
}

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

.social-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #333;
    color: #999;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: var(--bg-color);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: var(--shadow);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

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

    .hero-title {
        font-size: 2.5rem;
    }

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

    .feature-detail,
    .feature-detail.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }

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

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

    .page-header h1 {
        font-size: 2rem;
    }

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .btn {
        padding: 0.6rem 1.5rem;
        font-size: 0.9rem;
    }

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

/* Download Modal */
.download-modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.download-modal-backdrop.is-open {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.download-modal {
    width: 100%;
    max-width: 520px;
    background: var(--bg-color);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 28px;
    position: relative;
    transform: translateY(10px);
    transition: transform 0.2s ease;
}

.download-modal-backdrop.is-open .download-modal {
    transform: translateY(0);
}

.download-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 40px;
    height: 40px;
    border-radius: 999px;
    border: 2px solid var(--border-color);
    background: var(--bg-color);
    cursor: pointer;
    font-size: 24px;
    line-height: 1;
    color: var(--text-color);
    transition: var(--transition);
}

.download-modal-close:hover {
    border-color: var(--primary-color);
}

.download-modal-title {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.download-modal-text {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.download-modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
    flex-wrap: wrap;
}

/* Minimal landing page (download-only layout) */
.landing-page {
    min-height: 100vh;
    background: var(--bg-color);
    padding: 2rem 1.5rem 3rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.landing-version {
    font-size: 2.5rem;
    font-weight: 800;
    color: #333;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

.landing-logo {
    width: 80px;
    height: 80px;
    background: var(--primary-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
}

.landing-logo svg {
    width: 48px;
    height: 48px;
    color: #fff;
}

.landing-product-name {
    font-size: 2.25rem;
    font-weight: 700;
    color: #333;
    margin-bottom: 2rem;
}

.landing-download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: #ffffff;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: var(--shadow);
}

.landing-download-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.landing-download-btn svg {
    width: 22px;
    height: 22px;
}

.landing-disclaimer {
    max-width: 420px;
    margin: 1.25rem auto 2.5rem;
    font-size: 0.875rem;
    color: #666;
    line-height: 1.5;
}

.landing-disclaimer a {
    color: #2563eb;
    text-decoration: underline;
}

.landing-disclaimer a:hover {
    color: #1d4ed8;
}

.landing-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem 1rem;
    margin-bottom: 2.5rem;
}

.landing-step {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    color: #333;
}

.landing-step-num {
    width: 28px;
    height: 28px;
    background: var(--primary-color);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
}

.landing-step-arrow {
    color: #999;
    font-size: 1.25rem;
    margin: 0 0.25rem;
}

.landing-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem 2rem;
    max-width: 520px;
    text-align: left;
    font-size: 0.9rem;
    color: #333;
}

.landing-details dt {
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.landing-details dd {
    margin: 0 0 0.75rem 0;
    color: #666;
}

@media (max-width: 600px) {
    .landing-version { font-size: 2rem; }
    .landing-product-name { font-size: 1.75rem; }
    .landing-steps { flex-direction: column; }
    .landing-step-arrow { transform: rotate(90deg); }
    .landing-details { grid-template-columns: 1fr; text-align: center; }
}