:root {
    --color-primary: #707070;
    --color-dark: #333;
    --color-white: #ffffff;
    --color-green: #618A72;
    --color-green-dark: #4d6e5a;
    --color-bg-light: #f4f7f5;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

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

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--color-dark);
    background-color: var(--color-white);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center { text-align: center; }
.mt-4 { margin-top: 2rem; }
.narrow { max-width: 800px; margin-left: auto; margin-right: auto; }

/* Header & Nav */
header {
    background: var(--color-white);
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 50px;
}

nav ul {
    display: flex;
    list-style: none;
    align-items: center;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    text-decoration: none;
    color: var(--color-primary);
    font-weight: 400;
    transition: color 0.3s;
}

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

/* Buttons */
.btn-primary, .btn-secondary, .btn-cta {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

.btn-primary, .btn-cta {
    background-color: var(--color-green);
    color: var(--color-white) !important;
}

.btn-primary:hover, .btn-cta:hover {
    background-color: var(--color-green-dark);
}

.btn-secondary {
    border: 2px solid var(--color-green);
    color: var(--color-green);
    margin-left: 10px;
}

.btn-secondary:hover {
    background-color: var(--color-green);
    color: var(--color-white);
}

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

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

h2 {
    font-size: 2.2rem;
    margin-bottom: 30px;
    font-weight: 300;
    color: var(--color-primary);
}

h3 {
    font-size: 1.5rem;
    margin: 20px 0 15px;
    font-weight: 600;
}

/* Hero */
.hero {
    padding: 100px 0;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    align-items: center;
}

.hero-text h1 {
    font-size: 3rem;
    line-height: 1.2;
    margin-bottom: 20px;
    font-weight: 300;
}

.hero-text p {
    font-size: 1.2rem;
    color: var(--color-primary);
    margin-bottom: 30px;
}

.hero-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

/* Grid layout */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

/* Lists */
ul.check-list, ul.why-list, ul.ref-list {
    list-style: none;
}

ul.check-list li, ul.why-list li, ul.ref-list li {
    margin-bottom: 12px;
    position: relative;
    padding-left: 25px;
}

ul.check-list li::before, ul.why-list li::before, ul.ref-list li::before {
    content: "•";
    color: var(--color-green);
    position: absolute;
    left: 0;
    font-weight: bold;
}

.benefits-card {
    background: var(--color-bg-light);
    padding: 30px;
    border-radius: 10px;
    border-left: 5px solid var(--color-green);
}

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

.benefits-list li {
    margin-bottom: 12px;
}

.benefits-list span {
    color: var(--color-green);
    margin-right: 10px;
    font-weight: bold;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stat-item {
    text-align: center;
    padding: 20px;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 600;
    color: var(--color-green);
}

.stat-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-primary);
}

/* Cards */
.card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

/* Footer */
footer {
    background: var(--color-dark);
    color: var(--color-white);
    padding: 60px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 40px;
}

footer h3 {
    margin-top: 0;
}

footer a {
    color: var(--color-white);
    text-decoration: none;
}

.footer-cert img {
    max-height: 80px;
    background: white;
    padding: 10px;
    border-radius: 5px;
}

.footer-bottom {
    grid-column: 1 / -1;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.7;
}

.tag {
    display: inline-block;
    color: var(--color-green);
    text-transform: uppercase;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 1.5px;
    margin-bottom: 10px;
}

/* Responsive */
@media (max-width: 768px) {
    .hero-grid, .grid-2, .stats-grid, .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-text h1 {
        font-size: 2.2rem;
    }
    
    .header-content {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 20px;
    }
    
    nav ul li {
        margin: 0 10px;
    }
    
    .hero-actions {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    
    .btn-secondary {
        margin-left: 0;
    }
}