:root {
    --primary: #4A90E2;
    --accent: #004688;
    --danger: #FF6B6B;
    --light: #FFFFFF;
    --gray: #6C757D;
    --text-dark: #2C3E50;
    --text-light: #F8F9FA;
}
* {
    font-family: 'Poppins', sans-serif;
}

html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

/* Navbar */
nav.navbar {
    background-color: var(--primary);
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: background-color 0.3s ease;
    box-shadow: none !important;
    border: none;
}
nav.navbar .logo {
    height: 70px;
    width: auto;
    /* Outline putih tipis di sekeliling logo PNG */
    filter: drop-shadow(1px 0 0 #fff)
            drop-shadow(-1px 0 0 #fff)
            drop-shadow(0 1px 0 #fff)
            drop-shadow(0 -1px 0 #fff);
}

nav.navbar .navbar-brand {
    color: var(--light);
    font-size: 24px;
    font-weight: 700;
}
nav.navbar .navbar-brand:hover {
    color: var(--text-light);
}
nav.navbar .nav-link {
    color: var(--text-light);
    font-weight: 500;
    margin-right: 20px;
    transition: 0.3s;
}
nav.navbar .nav-link:hover {
    color: var(--accent);
}
nav.navbar .btn-login {
    border: 2px solid var(--light);
    color: var(--light);
    border-radius: 20px;
    padding: 5px 15px;
    transition: 0.3s;
}
nav.navbar .btn-login:hover {
    background-color: var(--light);
    color: var(--primary);
}
nav.navbar .btn-register {
    background-color: var(--danger);
    border: none;
    color: var(--light);
    border-radius: 20px;
    padding: 5px 15px;
    margin-left: 10px;
    transition: 0.3s;
}
nav.navbar .btn-register:hover {
    background-color: #e05555;
}

/* Hero */
.hero {
    background-color: var(--primary);
    min-height: 70vh;
    position: relative;
    color: var(--text-light);
    overflow: hidden;
    display: flex;
    align-items: center;
}
.hero-img {
    max-width: 320px;
    width: 100%;
    height: auto;
    filter: drop-shadow(1px 0 0 #fff)
            drop-shadow(-1px 0 0 #fff)
            drop-shadow(0 1px 0 #fff)
            drop-shadow(0 -1px 0 #fff);
}
@media (max-width: 768px) {
    .hero-img {
        max-width: 250px;
        padding-top: 50px;
    }
}
.hero .btn {
    background-color: var(--light);
    color: var(--primary);
    font-weight: 600;
    transition: 0.3s;
}
.hero .btn:hover {
    background-color: var(--accent);
    color: var(--light);
}

/* About */
.about h2 {
    font-weight: 700;
    margin-bottom: 20px;
}
.about h2 .highlight {
    color: var(--accent);
    font-size: 2.5rem;
}
.about p {
    color: var(--text-dark);
    font-size: 1.1rem;
    line-height: 1.6;
    text-align: justify;
}

/* Footer */
footer {
    background-color: var(--primary);
    color: var(--text-light);
    padding: 40px 20px;
}
footer a {
    color: var(--light);
    text-decoration: none;
}
footer a:hover {
    color: var(--accent);
}
.footer-list li {
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}
.footer-list li:last-child {
    border-bottom: none;
}

/* Login */
.login-header {
    background-color: var(--primary);
}
.btn-primary {
    background-color: var(--primary);
    border-color: var(--primary);
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
    background-color: var(--accent);
    border-color: var(--accent);
    box-shadow: none;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.2rem rgba(74, 144, 226, 0.25);
}
.text-danger {
    color: var(--danger);
}

.stat-card {
    background-color: #fff;
    border: 1px solid #e0e0e0;
    padding: 1.5rem;
    border-radius: 0.75rem;
    transition: box-shadow 0.3s ease;
}

.stat-card:hover {
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.stat-icon {
    color: var(--accent);
    font-size: 3.5rem;
    margin-bottom: 1rem;
    transition: color 0.3s ease;
}

.stat-card:hover .stat-icon {
    color: #2a6ad8;
}

.stat-card p {
    color: var(--primary);
    font-size: 0.9rem;
    line-height: 1.3;
    margin-top: 0.5rem;
}

/* Responsive */
@media (max-width: 767px) {
    .stat-card {
        padding: 1rem;       /* padding diperkecil */
        max-width: 320px;    /* supaya card tidak terlalu melebar */
        margin-left: auto;
        margin-right: auto;  /* center di layar kecil */
    }
    .stat-icon {
        font-size: 2.5rem;
    }
}