:root {
    --bg-color: #ffffff;
    --text-primary: #000000;
    --text-secondary: #555555;
    --accent: #000000;
    --border-color: #e5e5e5;
    
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Inter', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

/* --- Navigation --- */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 5%;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    width: 32px;
    height: auto;
    object-fit: contain;
}

.brand-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: opacity 0.3s ease;
}

.nav-links a:hover {
    opacity: 0.7;
}

.nav-btn {
    background-color: var(--text-primary);
    color: var(--bg-color) !important;
    padding: 10px 20px;
    border-radius: 4px;
}

.nav-btn:hover {
    opacity: 1 !important;
    background-color: #222;
}


/* --- Hero Section --- */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 80vh;
    padding: 0 5%;
    gap: 40px;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 4rem;
    line-height: 1.1;
    font-weight: 700;
    letter-spacing: -1.5px;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 90%;
}

.hero-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Animating Download Button */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--text-primary);
    color: var(--bg-color);
    text-decoration: none;
    padding: 18px 32px;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 1.1rem;
    border-radius: 6px;
    width: fit-content;
    border: 2px solid var(--text-primary);
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    overflow: hidden;
}

.btn-icon {
    margin-left: 16px;
    transition: transform 0.3s ease;
}

.btn-primary:hover {
    background-color: var(--bg-color);
    color: var(--text-primary);
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.1);
}

.btn-primary:hover .btn-icon {
    transform: translateY(4px);
}

.download-info {
    font-size: 0.85rem;
    color: #888;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-placeholder {
    width: 400px;
    height: 400px;
    background: #f8f8f8;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid var(--border-color);
    position: relative;
}

.floating-logo {
    width: 150px;
    height: auto;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}


/* --- Features Section --- */
.features {
    padding: 100px 5%;
    background-color: #fafafa;
    border-top: 1px solid var(--border-color);
}

.section-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 60px;
    letter-spacing: -1px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.feature-card {
    background: var(--bg-color);
    padding: 40px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.06);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 24px;
}

.feature-card h4 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* --- How It Works Section --- */
.how-it-works {
    padding: 100px 5%;
    background-color: var(--bg-color);
}

.how-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    max-width: 1200px;
    margin: 0 auto;
}

.col-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    margin-bottom: 32px;
}

.step-list {
    list-style: none;
    counter-reset: my-counter;
    display: flex;
    flex-direction: column;
    gap: 32px;
    margin-bottom: 40px;
}

.step-list li {
    position: relative;
    padding-left: 56px;
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.step-list li::before {
    counter-increment: my-counter;
    content: counter(my-counter);
    position: absolute;
    left: 0;
    top: -4px;
    width: 36px;
    height: 36px;
    background-color: var(--text-primary);
    color: var(--bg-color);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1rem;
}

.step-list li strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: 6px;
    font-size: 1.15rem;
}

.step-list li code {
    background: #f0f0f0;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9rem;
    color: #333;
}

.use-cases-box {
    background: #fafafa;
    padding: 32px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.use-cases-box h5 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.use-cases-box ul {
    padding-left: 20px;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    gap: 14px;
    font-size: 0.95rem;
}

.chat-container {
    background: #f8f8f8;
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.chat-bubble {
    padding: 16px 24px;
    border-radius: 16px;
    max-width: 85%;
    font-size: 0.95rem;
    line-height: 1.5;
    animation: fadeIn 0.5s ease-out;
}

.user-bubble {
    background-color: var(--text-primary);
    color: var(--bg-color);
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.bot-bubble {
    background-color: #ffffff;
    color: var(--text-primary);
    align-self: flex-start;
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.04);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 900px) {
    .how-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}


/* --- Footer --- */
.footer {
    padding: 40px 5%;
    background-color: var(--text-primary);
    color: var(--bg-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: var(--font-display);
    font-weight: 700;
}

.footer-brand-img {
    width: 24px;
    filter: invert(1);
}

.copyright {
    font-size: 0.85rem;
    opacity: 0.6;
}

/* --- Scroll Animations --- */
.section-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* Responsive */
@media (max-width: 768px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 60px;
        padding-bottom: 60px;
    }
    
    .hero-title {
        font-size: 2.8rem;
    }
    
    .hero-content {
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        align-items: center;
    }
    
    .hero-subtitle {
        max-width: 100%;
    }
    
    .visual-placeholder {
        width: 300px;
        height: 300px;
    }
    
    .footer {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

/* --- Infinite Marquee --- */
.marquee-container {
    background-color: var(--text-primary);
    color: var(--bg-color);
    overflow: hidden;
    white-space: nowrap;
    display: flex;
    align-items: center;
    padding: 20px 0;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.marquee-content {
    display: flex;
    align-items: center;
    animation: scroll 25s linear infinite;
}

.marquee-item {
    display: flex;
    align-items: center;
    gap: 16px;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.6rem;
    margin-right: 60px;
    letter-spacing: 2px;
}

.marquee-logo {
    width: 36px;
    height: auto;
    filter: invert(1);
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-100%); }
}