/* --- BASE STYLES --- */
:root {
    --bg-dark: #050505;
    --card-bg: rgba(255, 255, 255, 0.03);
    --border-light: rgba(255, 255, 255, 0.08);
    --text-main: #ffffff;
    --text-muted: #a0a0a0;
    --glow-green: #00df89;
    --glow-cyan: #00f2ff;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: 'Inter', system-ui, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    overflow-x: hidden;
}

/* --- NAVBAR --- */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 5%;
    border-bottom: 1px solid var(--border-light);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.yv-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 20px;
}

.yv-logo {
    background: #fff;
    color: #000;
    padding: 4px 8px;
    border-radius: 4px;
    font-weight: 900;
    letter-spacing: -1px;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 15px;
    font-size: 14px;
    transition: 0.3s;
}

.nav-links a:hover { color: #fff; }

/* --- BUTTONS --- */
.btn-primary {
    background: linear-gradient(90deg, #004d40, var(--glow-green));
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 600;
    cursor: pointer;
    transition: 0.3s;
    text-decoration: none;
    display: inline-block;
}

.btn-primary:hover {
    box-shadow: 0 0 20px rgba(0, 223, 137, 0.4);
    transform: translateY(-2px);
}

/* --- HERO SECTION --- */
.hero {
    text-align: center;
    padding: 100px 20px;
    position: relative;
}

/* Background ambient glow */
.hero::before {
    content: '';
    position: absolute;
    top: 20%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 400px;
    background: radial-gradient(circle, rgba(0,223,137,0.15) 0%, rgba(0,0,0,0) 70%);
    z-index: -1;
}

.hero h1 {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero p {
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px auto;
    font-size: 18px;
}

/* --- MODEL GRID (Pick the best characteristics) --- */
.section-title {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
}

.models-section {
    padding: 80px 5%;
}

.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.model-card {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: 20px;
    padding: 24px;
    display: flex;
    align-items: flex-start;
    gap: 15px;
    transition: 0.3s;
}

.model-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.05);
}

.model-icon {
    font-size: 24px;
}

.model-info h3 { margin: 0 0 5px 0; font-size: 18px; }
.model-badge {
    font-size: 11px;
    color: var(--glow-cyan);
    background: rgba(0, 242, 255, 0.1);
    padding: 3px 8px;
    border-radius: 10px;
    display: inline-block;
    margin-bottom: 10px;
}

.model-info p {
    margin: 0;
    color: var(--text-muted);
    font-size: 14px;
}

/* --- PRICING SECTION --- */
.pricing-section {
    padding: 80px 5%;
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    gap: 30px;
}

.pricing-card {
    background: var(--card-bg);
    border: 1px solid var(--border-light);
    border-radius: 24px;
    padding: 40px;
    flex: 1;
}

.pricing-card.highlight {
    border-color: var(--glow-green);
    position: relative;
    background: linear-gradient(180deg, rgba(0,223,137,0.05) 0%, rgba(0,0,0,0) 100%);
}

.price {
    font-size: 48px;
    font-weight: bold;
    margin: 20px 0;
}

.price span { font-size: 18px; color: var(--text-muted); font-weight: normal; }

.feature-list {
    list-style: none;
    padding: 0;
    margin: 30px 0;
}

.feature-list li {
    margin-bottom: 15px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 10px;
}

.feature-list li::before {
    content: '✔';
    color: var(--glow-green);
}