/* --- CSS Reset & Basic Setup --- */
:root {
    --sea-blue: #005f73;
    --teal: #0a9396;
    --light-blue: #94d2bd;
    --background-color: #e9f5f5;
    --white: #ffffff;
    --text-color: #001219;
}

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

body {
    font-family: 'Sarabun', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

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

/* --- Header & Footer --- */
.site-header, .site-footer {
    background-color: var(--sea-blue);
    color: var(--white);
    padding: 1rem 0;
}

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

.logo {
    font-weight: 700;
    font-size: 1.2rem;
}

.login-button-nav {
    color: var(--sea-blue);
    background-color: var(--white);
    padding: 0.5rem 1.5rem;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 700;
    transition: background-color 0.3s, color 0.3s;
}

.login-button-nav:hover {
    background-color: var(--light-blue);
}

.site-footer a {
    color: var(--white);
    text-decoration: none;
    margin: 0 1rem;
}

.site-footer a:hover {
    text-decoration: underline;
}

/* --- Hero Section (Main Content) --- */
.hero-section {
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem 0;
}

.hero-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: #333;
}

.cta-button {
    display: inline-block;
    background-color: var(--teal);
    color: var(--white);
    font-size: 1.2rem;
    font-weight: 700;
    padding: 1rem 3rem;
    text-decoration: none;
    border-radius: 8px;
    transition: background-color 0.3s;
}

.cta-button:hover {
    background-color: var(--sea-blue);
}

/* --- Responsive for Mobile --- */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 2rem;
    }
    .hero-content p {
        font-size: 1rem;
    }
}