* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Segoe UI', Arial, sans-serif;
    background: linear-gradient(135deg, #d9a7ff, #fbc2eb, #a1c4fd);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
}

/* --- 2. CONTAINER KARTU (DENGAN ANIMASI RESIZE) --- */
.auth-card {
    width: 380px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-radius: 25px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    overflow: hidden; 
    position: relative;
    z-index: 10;
    /* PENTING: Transisi halus saat tinggi berubah */
    transition: height 0.4s cubic-bezier(0.25, 1, 0.5, 1); 
}

.form-wrapper {
    width: 100%;
}

.forms-container {
    display: flex;
    width: 200%; /* Lebar 200% untuk menampung Login & Register berdampingan */
    transition: transform 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    align-items: flex-start; 
}

.auth-card.active .forms-container {
    transform: translateX(-50%); /* Geser ke kiri untuk menampilkan Register */
}

/* --- 3. STYLING FORM --- */
form {
    width: 50%;
    flex-shrink: 0;
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h2 {
    margin: 0 0 10px;
    text-align: center;
    font-size: 26px;
    background: linear-gradient(45deg, purple, hotpink);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.subtitle {
    text-align: center; color: gray; font-size: 14px; margin-bottom: 25px;
}

label {
    font-size: 14px; color: #444; width: 100%; margin-bottom: 6px; font-weight: bold;
}

input {
    width: 100%; padding: 12px; border-radius: 12px;
    border: 2px solid #ccc; background: #fafafa;
    margin-bottom: 15px; font-size: 14px; transition: 0.3s;
}

input:focus { outline: none; border-color: purple; background: #fff; box-shadow: 0 0 8px rgba(128, 0, 128, 0.1); }

/* Tombol */
.btn-submit {
    width: 100%; padding: 14px;
    background: linear-gradient(45deg, purple, hotpink);
    color: white; border-radius: 15px; border: none;
    cursor: pointer; font-size: 16px; font-weight: bold;
    transition: 0.25s ease; margin-top: 10px;
    box-shadow: 0 4px 15px rgba(128, 0, 128, 0.2);
}
.btn-submit:hover { transform: scale(1.02); }

/* Link Switch */
.switch-text { margin-top: 20px; font-size: 14px; color: #555; }
.switch-text a { color: purple; text-decoration: none; font-weight: bold; cursor: pointer; }
.switch-text a:hover { text-decoration: underline; }

/* --- ERROR BOX (KOTAK MERAH) --- */
.error-box {
    width: 100%; 
    color: #d8000c; 
    background: #ffbaba;
    border: 1px solid #ff7675;
    padding: 12px; 
    border-radius: 10px; 
    margin-bottom: 20px;
    font-size: 13px; 
    text-align: center; 
    display: none; /* Default sembunyi */
    font-weight: bold;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Dekorasi Buah */
.fruit { position: absolute; width: 90px; opacity: 0.85; animation: float 6s infinite ease-in-out, drift 15s infinite linear; pointer-events: none; z-index: 1; }
.f1 { top: 8%; left: 10%; width: 80px; } .f2 { top: 65%; right: 12%; } .f3 { top: 22%; right: 55%; width: 60px; }
.f4 { bottom: 15%; left: 28%; } .f5 { bottom: 10%; right: 30%; width: 70px; } .f6 { top: 40%; left: 50%; }
.f7 { bottom: 30%; left: 15%; width: 50px; } .f8 { top: 75%; right: 40%; } .f9 { top: 50%; left: 80%; width: 85px; }
.f10 { bottom: 20%; right: 5%; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px) rotate(6deg); } }
@keyframes drift { 0%, 100% { transform: translateX(0); } 50% { transform: translateX(15px); } }

/* Glitter */
.glitter { position: absolute; width: 4px; height: 4px; background: purple; border-radius: 50%; opacity: 0; animation: glitter-burst 2s infinite ease-out; pointer-events: none; z-index: 11; }
@keyframes glitter-burst { 0% { transform: scale(0.4); opacity: 0.9; } 100% { transform: scale(1) translate(var(--x), var(--y)); opacity: 0; } }