/* ===== Reset & Base ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Vazirmatn', sans-serif;
    background: #f8faf9;
    color: #1a2e1a;
    line-height: 1.8;
    scroll-behavior: smooth;
}

/* ===== Green Theme Variables ===== */
:root {
    --green-dark: #1b5e20;
    --green-main: #2e7d32;
    --green-light: #4caf50;
    --green-pale: #e8f5e9;
    --green-accent: #81c784;
    --text-dark: #1a2e1a;
    --text-light: #555;
    --white: #ffffff;
}

/* ===== Header / Navigation ===== */
.header {
    background: var(--green-dark);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

.nav {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--white);
}

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

.nav-links a {
    color: var(--green-accent);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: var(--white);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--green-dark), var(--green-main));
    color: var(--white);
    text-align: center;
    padding: 5rem 2rem;
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 0.5rem;
}

.hero-subtitle {
    font-size: 1.3rem;
    color: var(--green-accent);
    margin-bottom: 1rem;
}

.hero-desc {
    font-size: 1.05rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    background: var(--white);
    color: var(--green-dark);
    pad