* {
    box-sizing: border-box;
}

html {
    overflow-y: scroll;
}

:root {
    --header-height: 120px;
    --bg-color: #f3f1eb;
    --text-color: #333;
    --menu-bg: #fffffff6;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--bg-color);
    margin: 0;
    color: var(--text-color);
}

#main-header {
    position: sticky;
    top: 0;
    background-color: var(--bg-color);
    padding: 0 2rem;
    height: var(--header-height);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: all 0.3s ease;
    width: 100%;
    box-sizing: border-box;
}

.logo-image {
    height: 100px;
    width: auto;
    display: block;
}

#main-header>a {
    display: flex;
    align-items: center;
}

.header-pay-container {
    position: absolute;
    right: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    z-index: 1002;
}

.header-pay-btn {
    background-color: var(--link-color, #000);
    color: white;
    text-decoration: none;
    padding: 0.75rem 1.25rem;
    border-radius: 8px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-width: 180px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.2s ease;
}

.header-pay-btn:hover {
    background-color: #000000ac;
    transform: translateY(-2px);
    box-shadow: 0 6px 8px rgba(0, 0, 0, 0.15);
}

.header-pay-btn i,
.header-pay-btn span.material-icons {
    font-size: 1.1rem;
}

.pay-by-phone {
    margin: 0;
    font-size: 0.7rem;
    font-weight: bold;
    color: var(--text-color);
    white-space: nowrap;
    letter-spacing: 0.5px;
}

#main-content {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem;
}

.menu-container {
    position: absolute;
    left: 2rem;
    z-index: 1001;
}

.hamburger-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-color);
}

.side-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 300px;
    height: calc(100vh - var(--header-height));
    background-color: var(--menu-bg);
    box-shadow: 2px 0 5px var(--shadow-color);
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out;
    z-index: 999;
    padding-top: 1rem;
    box-sizing: border-box;
}

.side-menu.open {
    transform: translateX(0);
}

.side-menu a {
    display: block;
    padding: 0.8rem 1.5rem;
    color: var(--text-color);
    text-decoration: none;
    font-size: 1.05rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.2s ease;
}

.side-menu a:hover {
    background-color: #f9f9f9;
}

/* Responsive */
@media (max-width: 600px) {
    #main-header {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100px;
        padding: 0 1rem;
        justify-content: center;
        box-sizing: border-box;
    }

    body {
        padding-top: 100px;
    }

    .logo-image {
        height: 60px;
        /* Smaller logo */
    }

    .menu-container {
        left: 1rem;
    }

    .header-pay-container {
        position: static;
        gap: 0.15rem;
    }

    .header-pay-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.9rem;
        min-width: 160px;
    }

    .header-pay-btn .btn-text {
        display: inline;
    }

    .header-pay-btn i,
    .header-pay-btn span.material-icons {
        margin: 0;
    }

    .pay-by-phone {
        font-size: 0.6rem;
    }

    #main-content {
        padding: 1rem;
    }

    .side-menu {
        width: 100%;
    }
}