/* ========================================
   RESET & BASE STYLES
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Source Sans Pro', sans-serif;
}

/* ========================================
   BODY & BACKGROUND
======================================== */
body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #07325f 0%, #3363aa 50%, #6696de 100%);
    overflow: hidden;
    position: relative;
}

/* Animasi background opsional */
body::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(
        circle,
        rgba(255, 255, 255, 0.1) 0%,
        transparent 70%
    );
    animation: rotate 30s linear infinite;
    z-index: 0;
}

@keyframes rotate {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* ========================================
   CONTAINER
======================================== */
.container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    z-index: 1;
    position: relative;
}

/* ========================================
   CARD STYLE (Glassmorphism)
======================================== */
.card {
    width: 420px;
    padding: 2.5rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
    animation: fadeInUp 0.6s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   LOGO (Jika Ada)
======================================== */
.card img.tr {
    width: 100px;
    margin-bottom: 1rem;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.2));
}

/* ========================================
   TITLE
======================================== */
.card h3 {
    font-weight: 700;
    font-size: 1.8rem;
    color: #ffffff;
    margin-bottom: 2rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* ========================================
   FORM GROUPS
======================================== */
.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    font-weight: 600;
    font-size: 0.95rem;
    color: #ffffff;
    display: block;
    margin-bottom: 0.5rem;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    outline: none;
    font-size: 1rem;
    background-color: rgba(255, 255, 255, 0.9);
    transition: all 0.3s ease;
}

.form-group input:focus {
    background-color: rgba(255, 255, 255, 1);
    border-color: #007bff;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
    transform: translateY(-2px);
}

.form-group input::placeholder {
    color: #aaa;
    font-size: 0.9rem;
}

/* ========================================
   BUTTON
======================================== */
button.btn-primary {
    width: 100%;
    background: linear-gradient(135deg, #10437a 0%, #0056b3 100%);
    border: none;
    padding: 0.85rem;
    border-radius: 10px;
    margin-top: 1.5rem;
    font-size: 1.05rem;
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(16, 67, 122, 0.3);
}

button.btn-primary:hover {
    background: linear-gradient(135deg, #0056b3 0%, #003d82 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 67, 122, 0.4);
}

button.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(16, 67, 122, 0.3);
}

/* ========================================
   TEXT & LINKS
======================================== */
.text-center {
    margin-top: 1.5rem;
    color: #ffffff;
    font-size: 0.95rem;
}

.text-center a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    border-bottom: 2px solid transparent;
    transition: all 0.3s ease;
    padding-bottom: 2px;
}

.text-center a:hover {
    border-bottom-color: #ffffff;
    color: #e3f2fd;
}

/* ========================================
   ALERT MESSAGES
======================================== */
.alert {
    background-color: rgba(220, 53, 69, 0.15);
    border-left: 4px solid #dc3545;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    text-align: left;
    color: #ffffff;
    font-weight: 500;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(-10px);
    }
    75% {
        transform: translateX(10px);
    }
}

.alert ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.alert li {
    margin-bottom: 0.3rem;
}

/* Success Alert (Opsional) */
.alert-success {
    background-color: rgba(40, 167, 69, 0.15);
    border-left-color: #28a745;
    color: #ffffff;
}

/* ========================================
   RESPONSIVE DESIGN
======================================== */
@media (max-width: 480px) {
    .card {
        width: 90%;
        padding: 2rem 1.5rem;
    }

    .card h3 {
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .card img.tr {
        width: 80px;
    }

    .form-group {
        margin-bottom: 1.2rem;
    }

    .form-group input {
        padding: 0.65rem 0.9rem;
        font-size: 0.95rem;
    }

    button.btn-primary {
        padding: 0.75rem;
        font-size: 1rem;
        margin-top: 1rem;
    }

    .text-center {
        font-size: 0.9rem;
    }
}

@media (max-width: 360px) {
    .card {
        width: 95%;
        padding: 1.5rem 1rem;
    }

    .card h3 {
        font-size: 1.3rem;
    }
}

/* ========================================
   REMEMBER ME CHECKBOX (Bonus)
======================================== */
.remember-me {
    display: flex;
    align-items: center;
    margin-top: 1rem;
    color: #ffffff;
}

.remember-me input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
    cursor: pointer;
}

.remember-me label {
    margin-bottom: 0;
    cursor: pointer;
    font-size: 0.9rem;
}