body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: linear-gradient(135deg, #e0f7fa 0%, #80deea 100%);
    margin: 0;
    min-height: 100vh;
}
.container {
    max-width: 400px;
    margin: 60px auto;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08);
    padding: 32px 24px;
}
h1 {
    text-align: center;
    color: #00796b;
    margin-bottom: 24px;
}
#login-box h2 {
    color: #0097a7;
    margin-bottom: 16px;
}
label {
    display: block;
    margin-top: 12px;
    margin-bottom: 4px;
    color: #00796b;
    cursor: pointer;
}
input, select {
    width: 100%;
    padding: 8px;
    border-radius: 6px;
    border: 1px solid #b2ebf2;
    margin-bottom: 12px;
    font-size: 1em;
}
button {
    width: 100%;
    padding: 14px;
    background: linear-gradient(90deg, #2e8b57 60%, #4fc3f7 100%);
    color: #fff;
    border: none;
    border-radius: 12px;
    font-size: 1.1em;
    cursor: pointer;
    margin-top: 16px;
    box-shadow: 0 2px 8px rgba(46,139,87,0.12);
    transition: background 0.2s, transform 0.2s;
}
button:hover {
    background: linear-gradient(90deg, #388e3c 60%, #039be5 100%);
    transform: scale(1.04);
}
#game-box {
    margin-top: 24px;
}
/* Tambahan style untuk gamification dan ilustrasi interaktif */
.illustration {
    display: flex;
    justify-content: center;
    margin-bottom: 16px;
}
.score-box {
    background: #e1f5fe;
    color: #0277bd;
    border-radius: 8px;
    padding: 10px 16px;
    font-weight: bold;
    text-align: center;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(2,119,189,0.08);
}
.progress-bar {
    width: 100%;
    background: #eee;
    border-radius: 8px;
    margin-bottom: 10px;
    height: 18px;
    overflow: hidden;
}
.progress {
    background: linear-gradient(90deg, #4fc3f7, #2e8b57);
    height: 100%;
    transition: width 0.3s;
}
.welcome-card, .materi-card, .quiz-card, .sertifikat-card {
    animation: fadeIn 0.7s;
    border-radius: 18px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    padding: 24px;
    margin: 20px auto;
    max-width: 420px;
    text-align: center;
}
.sertifikat-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
}
.sertifikat-body h3 {
    margin: 8px 0;
    color: #2e8b57;
}
.sertifikat-footer {
    margin-top: 24px;
    font-size: 1.1em;
    color: #555;
}
.quiz-feedback {
    color: #388e3c;
    font-weight: bold;
    margin-top: 12px;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px);}
    to { opacity: 1; transform: translateY(0);}
}