:root {
    --primary-green: #2ecc71;
    --secondary-blue: #3498db;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --white: #ffffff;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--white);
    color: var(--text-main);
    line-height: 1.6;
    scroll-behavior: smooth;
}

header {
    padding: 1.25rem 5%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid #e2e8f0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-green);
    letter-spacing: -0.5px;
}

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

nav ul li a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    transition: color 0.3s;
}

nav ul li a:hover {
    color: var(--primary-green);
}

.hero {
    height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: radial-gradient(circle at top, #f0fdf4 0%, var(--white) 100%);
    padding: 0 5%;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--dark-bg);
    font-weight: 900;
}

.hero p {
    font-size: clamp(1.1rem, 3vw, 1.5rem);
    color: var(--text-muted);
    max-width: 700px;
    margin-bottom: 2.5rem;
}

.cta-button {
    padding: 1rem 2.5rem;
    background-color: var(--primary-green);
    color: var(--white);
    text-decoration: none;
    border-radius: 99px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(46, 204, 113, 0.3);
}

.info-section {
    padding: 100px 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.alt-bg {
    background-color: var(--light-bg);
    max-width: 100%;
}

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

.content-grid.reverse {
    direction: rtl;
}

.content-grid.reverse .text {
    direction: ltr;
}

.text h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    color: var(--dark-bg);
}

.text p {
    margin-bottom: 1.2rem;
    font-size: 1.15rem;
    color: var(--text-muted);
}

.highlight {
    color: var(--primary-green);
}

.text ul {
    list-style-position: inside;
    margin-bottom: 1.2rem;
    font-size: 1.15rem;
    color: var(--text-muted);
}

.text li {
    margin-bottom: 0.5rem;
}

/* Visual Elements */
.ai-graphic {
    width: 300px;
    height: 300px;
    margin: auto;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.pulse-circle {
    width: 150px;
    height: 150px;
    background: var(--primary-green);
    border-radius: 50%;
    opacity: 0.2;
    animation: pulse 3s infinite ease-in-out;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.2; }
    50% { transform: scale(1.5); opacity: 0.05; }
    100% { transform: scale(1); opacity: 0.2; }
}

.feature-icon {
    font-size: 8rem;
    text-align: center;
}

/* Demo Section */
.demo-section {
    padding: 100px 5%;
    text-align: center;
    background-color: var(--dark-bg);
    color: var(--white);
}

.demo-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.demo-section p {
    color: #94a3b8;
    margin-bottom: 3rem;
}

.demo-box {
    max-width: 500px;
    margin: 0 auto;
    background: var(--white);
    padding: 2.5rem;
    border-radius: 24px;
    text-align: left;
}

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

.input-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.input-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    font-size: 1rem;
}

.button-container {
    text-align: center;
}

button#action-btn {
    width: 100%;
    padding: 1rem;
    background-color: var(--primary-green);
    color: var(--white);
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

button#action-btn:hover {
    background-color: #27ae60;
}

button#action-btn:disabled {
    background-color: #cbd5e1;
    cursor: not-allowed;
}

.status-msg {
    margin-top: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-style: italic;
}

footer {
    padding: 3rem 5%;
    text-align: center;
    border-top: 1px solid #e2e8f0;
    color: var(--text-muted);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .content-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    nav ul {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
        font-size: 0.9rem;
    }
    .hero h1 {
        font-size: 2.5rem;
    }
}