:root{
    --bg-main: linear-gradient(135deg,#020617 0%,#0f172a 50%,#020617 100%);
    --card-bg: rgba(15,23,42,.95);
    --border: rgba(148,163,184,.25);
    --accent: #38bdf8;
    --accent-soft: rgba(56,189,248,.25);
    --accent-dark: #0ea5e9;
    --text-main: #f8fafc;
    --text-muted: #cbd5e1;
    --danger: #ef4444;
    --success: #22c55e;
    --glass: rgba(255,255,255,0.05);
}

*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg-main);
    color:var(--text-main);
    min-height:100vh;
    display:flex;
    align-items:center;
    justify-content:center;
    padding:20px;
    overflow-x:hidden;
    position:relative;
}

body::before{
    content:'';
    position:fixed;
    top:0;
    left:0;
    right:0;
    bottom:0;
    background:radial-gradient(circle at 20% 30%, rgba(56,189,248,.15) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(34,197,94,.12) 0%, transparent 50%);
    z-index:-1;
    animation:backgroundShift 8s ease-in-out infinite alternate;
}

@keyframes backgroundShift{
    0%{transform:scale(1)}
    100%{transform:scale(1.1)}
}

/* ===== CONTAINER ===== */
.container{
    width:100%;
    max-width:450px;
}

.form-container{
    background:var(--card-bg);
    backdrop-filter:blur(30px);
    border:1px solid var(--border);
    border-radius:32px;
    padding:60px 50px;
    box-shadow:0 50px 100px rgba(0,0,0,.6);
    position:relative;
    overflow:hidden;
    animation:fadeUp 0.8s cubic-bezier(0.25,0.46,0.45,0.94);
}

.form-container::before{
    content:'';
    position:absolute;
    top:0;
    left:0;
    right:0;
    height:4px;
    background:linear-gradient(90deg, var(--accent), var(--accent-dark), var(--accent));
    border-radius:32px 32px 0 0;
}

.form-container::after{
    content:'';
    position:absolute;
    top:-50%;
    left:-50%;
    width:200%;
    height:200%;
    background:conic-gradient(transparent, rgba(56,189,248,.05), transparent);
    animation:spin 4s linear infinite;
    z-index:0;
}

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

.form-container h2{
    text-align:center;
    font-size:2.5rem;
    font-weight:900;
    margin-bottom:40px;
    background:linear-gradient(135deg, var(--accent), #60a5fa, var(--accent));
    -webkit-background-clip:text;
    -webkit-text-fill-color:transparent;
    background-clip:text;
    position:relative;
    z-index:1;
}

/* ===== ALERTS ===== */
.alert{
    padding:18px 24px;
    border-radius:20px;
    margin-bottom:30px;
    font-weight:600;
    font-size:0.95rem;
    display:flex;
    align-items:center;
    gap:12px;
    position:relative;
    z-index:1;
    backdrop-filter:blur(20px);
}

.alert-error{
    background:linear-gradient(135deg, var(--danger), #dc2626);
    border:1px solid rgba(239,68,68,.3);
    color:#fff;
    animation:shake 0.5s ease-in-out;
}

@keyframes shake{
    0%,100%{transform:translateX(0)}
    25%{transform:translateX(-5px)}
    75%{transform:translateX(5px)}
}

/* ===== FORM ===== */
form{
    position:relative;
    z-index:1;
}

.form-group{
    margin-bottom:28px;
}

.form-group label{
    display:block;
    margin-bottom:10px;
    font-weight:700;
    font-size:0.95rem;
    color:var(--text-main);
}

.form-group input{
    width:100%;
    background:rgba(2,6,23,.85);
    border:2px solid var(--border);
    border-radius:20px;
    padding:18px 24px;
    font-size:1rem;
    color:var(--text-main);
    font-family:inherit;
    transition:all 0.4s cubic-bezier(0.4,0,0.2,1);
    backdrop-filter:blur(15px);
}

.form-group input::placeholder{
    color:var(--text-muted);
}

.form-group input:focus{
    outline:none;
    border-color:var(--accent);
    box-shadow:0 0 0 4px var(--accent-soft);
    background:rgba(2,6,23,1);
    transform:translateY(-2px);
}

/* ===== REGISTER BUTTON ===== */
.btn{
    width:100%;
    padding:22px;
    background:linear-gradient(135deg, var(--accent), var(--accent-dark));
    border:none;
    border-radius:20px;
    color:#020617;
    font-weight:900;
    font-size:1.1rem;
    cursor:pointer;
    display:flex;
    align-items:center;
    justify-content:center;
    gap:12px;
    transition:all 0.4s cubic-bezier(0.4,0,0.2,1);
    position:relative;
    text-transform:uppercase;
    letter-spacing:0.5px;
    margin:20px 0;
    font-family:inherit;
}

.btn::before{
    content:'';
    position:absolute;
    top:0;
    left:-100%;
    width:100%;
    height:100%;
    background:linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition:left 0.6s;
}

.btn:hover::before{
    left:100%;
}

.btn:hover{
    transform:translateY(-5px);
    box-shadow:0 25px 50px rgba(56,189,248,.5);
}

.btn:active{
    transform:translateY(-3px);
}

/* ===== LOGIN LINK ===== */
.soliman{
    text-align:center;
    color:var(--text-muted);
    font-size:0.95rem;
    margin-top:30px;
    position:relative;
    z-index:1;
}

.soliman a{
    color:var(--accent);
    text-decoration:none;
    font-weight:700;
    transition:all 0.3s ease;
}

.soliman a:hover{
    text-shadow:0 0 10px var(--accent-soft);
    color:#60a5fa;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp{
    from{opacity:0;transform:translateY(40px)}
    to{opacity:1;transform:translateY(0)}
}

/* ===== RESPONSIVE ===== */
@media(max-width:480px){
    .container{max-width:100%}
    .form-container{padding:45px 35px;margin:10px;}
    .form-container h2{font-size:2.1rem}
    .form-group input{padding:16px 20px}
    .btn{padding:20px;font-size:1rem}
}

@media(max-width:360px){
    .form-container{padding:40px 25px}
}