/* ===== Variables ===== */
:root {
    --color-bg-dark: #0f1a24; /* smooth dark background */
    --color-green: #4cd188;
    --color-blue: #2da1f2;
    --color-yellow: #ffcc48; /* buttons & highlights */
    --color-text-light: #ffffff;
    --color-text-dark: #0f1a24;

    --font-main: 'Inter', sans-serif;

    --spacing-section: 80px;
}

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

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* ===== Header ===== */
.site-header {
    padding: 20px 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
}

.nav a {
    color: var(--color-text-light);
    margin-left: 20px;
    text-decoration: none;
    font-weight: 500;
}

.nav a:hover {
    opacity: 0.8;
}

/* ===== Hero ===== */
.hero {
    padding: var(--spacing-section) 0;
    text-align: center;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.hero p {
    max-width: 600px;
    margin: 0 auto 30px;
}

/* ===== Buttons ===== */
.btn-primary {
    display: inline-block;
    padding: 12px 24px;
    background-color: var(--color-yellow);
    color: var(--color-text-dark);
    font-weight: 600;
    border-radius: 6px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0px 4px 12px rgba(0,0,0,0.2);
}

/* ===== Features ===== */
.features {
    padding: var(--spacing-section) 0;
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.feature-card {
    flex: 1;
    min-width: 280px;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
}

.feature-card.green {
    background-color: var(--color-green);
    color: var(--color-text-dark);
}

.feature-card.blue {
    background-color: var(--color-blue);
    color: var(--color-text-light);
}

/* ===== Footer ===== */
.site-footer {
    padding: 40px 0;
    text-align: center;
    font-size: 0.9rem;
    opacity: 0.7;
}