* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', 'Segoe UI', sans-serif;
}

:root {
    --primary-color: #2471f3;      /* biru primary seperti toel.my.id */
    --secondary-color: #4fc3f7;    /* biru muda secondary */
    --accent-color: #f8fbff;       /* putih kebiruan sangat terang */
    --text-color: #222;            /* tetap gelap untuk kontras */
    --light-gray: #f8f9fa;         /* abu-abu terang */
    --border-color: #e3f2fd;       /* biru muda soft */
    --success-color: #28a745;      /* hijau success */
    --error-color: #dc3545;        /* merah error */
    --white: #ffffff;
    --sidebar-bg: linear-gradient(135deg, #2471f3 0%, #4fc3f7 100%); /* gradient biru */
    --primary-gradient: linear-gradient(135deg, #2471f3 0%, #4fc3f7 100%); /* gradient biru primary */
    --card-shadow: 0 4px 20px rgba(36, 113, 243, 0.08);
}

body {
    background: var(--light-gray);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    font-family: 'Poppins', 'Segoe UI', sans-serif;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s ease;
    text-align: center;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--white);
    box-shadow: var(--card-shadow);
}

.btn-primary:hover {
    background: #1a5cc8;
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(36, 113, 243, 0.15);
}

/* ========================================
   RESPONSIVE MEDIA QUERIES
======================================== */

/* Extra Large devices (large laptops and desktops, 1200px and up) */
@media (min-width: 1200px) {
    .container {
        max-width: 1400px;
        padding: 0 3rem;
    }
    
    .btn {
        padding: 1rem 2rem;
        font-size: 1.1rem;
    }
}

/* Large devices (laptops/desktops, 992px and up) */
@media (max-width: 1199.98px) {
    .container {
        max-width: 960px;
        padding: 0 2rem;
    }
}

/* Medium devices (tablets, 768px and up) */
@media (max-width: 991.98px) {
    .container {
        max-width: 720px;
        padding: 0 1.5rem;
    }
    
    .btn {
        padding: 0.7rem 1.3rem;
        font-size: 0.95rem;
    }
    
    body {
        font-size: 0.95rem;
    }
}

/* Small devices (landscape phones, 576px and up) */
@media (max-width: 767.98px) {
    .container {
        max-width: 540px;
        padding: 0 1rem;
    }
    
    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
        width: 100%;
        text-align: center;
    }
    
    body {
        font-size: 0.9rem;
        line-height: 1.5;
    }
}

/* Extra small devices (portrait phones, less than 576px) */
@media (max-width: 575.98px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.85rem;
        border-radius: 6px;
    }
    
    body {
        font-size: 0.85rem;
        line-height: 1.4;
    }
}

/* iPad specific (768px x 1024px) */
@media only screen and (min-device-width: 768px) and (max-device-width: 1024px) {
    .container {
        max-width: 90%;
        padding: 0 2rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
        min-height: 44px; /* iOS touch target minimum */
    }
}

/* iPad Pro (1024px x 1366px) */
@media only screen and (min-device-width: 1024px) and (max-device-width: 1366px) {
    .container {
        max-width: 95%;
        padding: 0 2.5rem;
    }
}

/* Touch devices */
@media (hover: none) and (pointer: coarse) {
    .btn {
        min-height: 48px; /* Better touch targets */
        min-width: 48px;
    }
    
    .btn:hover {
        transform: none; /* Disable hover effects on touch devices */
    }
}