@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700;800&display=swap');

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: radial-gradient(circle at top left, rgba(41, 128, 185, 0.30), transparent 24%),
                radial-gradient(circle at bottom right, rgba(243, 156, 18, 0.24), transparent 26%),
                linear-gradient(135deg, #06111d 0%, #0f2f56 44%, #121a36 100%);
    font-family: 'Montserrat', sans-serif;
    overflow-x: hidden;
}

body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(80px);
    opacity: 0.30;
}
body::before {
    width: 380px;
    height: 380px;
    top: -120px;
    left: -100px;
    background: rgba(41, 128, 185, 0.45);
}
body::after {
    width: 420px;
    height: 420px;
    bottom: -140px;
    right: -120px;
    background: rgba(243, 156, 18, 0.38);
}

h1 { font-weight: 800; margin: 0; color: #f4f7fb; text-shadow: 0 10px 25px rgba(0,0,0,0.45); letter-spacing: 0.4px; }
p { font-size: 14px; font-weight: 300; line-height: 22px; letter-spacing: 0.4px; margin: 20px 0 30px; color: #d0d7e0; }
span { font-size: 12px; color: #b8c7d0; }
a { color: #f1c40f; font-size: 14px; text-decoration: none; margin: 15px 0; font-weight: 700; }

.container {
    position: relative;
    width: 820px;
    max-width: 100%;
    min-height: 520px;
    border-radius: 32px;
    overflow: hidden;
    background: rgba(9, 18, 35, 0.92);
    border: 1px solid rgba(255,255,255,0.10);
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.45);
}

.container::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.04), transparent 35%);
    pointer-events: none;
}

.form-container {
    position: absolute;
    top: 0;
    height: 100%;
    transition: all 0.7s ease-in-out;
}

.sign-in-container,
.sign-up-container {
    width: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 60px;
}

.sign-in-container { left: 0; z-index: 2; }
.container.right-panel-active .sign-in-container { transform: translateX(100%); opacity: 0; pointer-events: none; }

.sign-up-container { left: 0; opacity: 0; pointer-events: none; }
.container.right-panel-active .sign-up-container { transform: translateX(100%); opacity: 1; z-index: 5; pointer-events: auto; }

form {
    width: 100%;
    max-width: 380px;
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 28px;
    box-shadow: 0 20px 45px rgba(0,0,0,0.30);
    padding: 46px 34px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    backdrop-filter: blur(18px);
}

input {
    width: 100%;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.16);
    color: #f4f7fb;
    padding: 15px 18px;
    margin: 10px 0;
    border-radius: 16px;
    outline: none;
    transition: all 0.3s ease;
}
input::placeholder { color: rgba(244,247,251,0.7); }
input:focus { border-color: rgba(241,196,15,0.9); background: rgba(255,255,255,0.13); }

button {
    width: 100%;
    border: none;
    border-radius: 999px;
    padding: 16px 24px;
    margin-top: 18px;
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0.8px;
    color: #08101a;
    background: linear-gradient(135deg, #f1c40f 0%, #f39c12 100%);
    cursor: pointer;
    transition: transform 0.22s ease, box-shadow 0.22s ease, filter 0.22s ease;
    box-shadow: 0 18px 30px rgba(243,156,18,0.28);
}
button:hover { transform: translateY(-2px); filter: brightness(1.05); box-shadow: 0 22px 36px rgba(243,156,18,0.36); }
button:active { transform: translateY(0); }
button.ghost { background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.26); color: #f4f7fb; }

.overlay-container {
    position: absolute;
    top: 0;
    left: 50%;
    width: 50%;
    height: 100%;
    overflow: hidden;
    transition: transform 0.7s ease-in-out;
    z-index: 100;
}
.container.right-panel-active .overlay-container { transform: translateX(-100%); }

overlay {
    position: relative;
    background: linear-gradient(135deg, rgba(41,128,185,0.96), rgba(169,50,38,0.96));
    color: #fff;
    height: 100%;
    width: 200%;
    transform: translateX(0);
    transition: transform 0.7s ease-in-out;
}
.container.right-panel-active .overlay { transform: translateX(50%); }

overlay::before {
    content: '';
    position: absolute;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    top: -90px;
    right: 90px;
    background: rgba(255,255,255,0.12);
}

overlay-panel {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 0 40px;
    text-align: center;
    top: 0;
    height: 100%;
    width: 50%;
    transition: transform 0.7s ease-in-out;
}
.overlay-left { transform: translateX(-20%); }
.container.right-panel-active .overlay-left { transform: translateX(0); }
.overlay-right { right: 0; transform: translateX(0); }
.container.right-panel-active .overlay-right { transform: translateX(20%); }

overlay-panel h1,
.overlay-panel p,
.overlay-panel button { color: #ffffff; }

overlay-panel button { background: rgba(255,255,255,0.14); border: 1px solid rgba(255,255,255,0.28); }

.mobile-text { display: none; margin-top: 25px; font-size: 14px; color: #ffffff; }
.mobile-text a { color: #f1c40f; font-weight: 700; }

@media (max-width: 768px) {
    body { padding: 20px; }
    .container { width: 100%; max-width: 420px; min-height: 650px; }
    .overlay-container { display: none; }
    .sign-in-container, .sign-up-container { width: 100%; }
    .sign-up-container { transform: translateX(100%); opacity: 1; z-index: 5; pointer-events: auto; }
    .container.right-panel-active .sign-in-container { transform: translateX(-100%); opacity: 0; }
    .container.right-panel-active .sign-up-container { transform: translateX(0); }
    form { padding: 0 24px; }
    .mobile-text { display: block; }
}