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

body{
    font-family:'Segoe UI',sans-serif;
    min-height:100vh;
    background:
        radial-gradient(circle at top,#26110b 0%,#120707 40%,#050202 100%);
    color:#f6e7c1;
    overflow-x:hidden;
}

/* Hiệu ứng nền */
body::before{
    content:"";
    position:fixed;
    inset:0;
    background:
        repeating-linear-gradient(
            45deg,
            rgba(255,215,120,0.02) 0px,
            rgba(255,215,120,0.02) 2px,
            transparent 2px,
            transparent 12px
        );
    pointer-events:none;
    animation:bgmove 18s linear infinite;
}

@keyframes bgmove{
    from{transform:translateY(0);}
    to{transform:translateY(-120px);}
}

/* ================== MENU ================== */
.menu-icon{
    display:none;
    width:100%;
    border:none;
    padding:14px;
    font-size:24px;
    cursor:pointer;
    background:linear-gradient(to right,#8a1d1d,#300606);
    color:#ffd67a;
    border-bottom:1px solid rgba(255,214,122,0.3);
}

.navbar{
    width:100%;
    display:flex;
    justify-content:center;
    align-items:center;
    gap:8px;
    padding:10px 0;
    position:sticky;
    top:0;
    z-index:999;
    backdrop-filter:blur(10px);
    background:rgba(20,5,5,0.82);
    border-bottom:1px solid rgba(255,214,122,0.2);
    box-shadow:0 8px 30px rgba(0,0,0,0.55);
}

.navbar a{
    position:relative;
    padding:14px 24px;
    text-decoration:none;
    color:#f8dfaa;
    font-weight:600;
    border-radius:12px;
    transition:.35s;
    overflow:hidden;
}

.navbar a::before{
    content:"";
    position:absolute;
    inset:0;
    background:linear-gradient(
        135deg,
        rgba(255,214,122,0.15),
        transparent
    );
    opacity:0;
    transition:.35s;
}

.navbar a:hover{
    color:#fff2cc;
    transform:translateY(-2px);
    background:rgba(255,214,122,0.08);
    box-shadow:0 0 18px rgba(255,214,122,0.15);
}

.navbar a:hover::before{
    opacity:1;
}

/* ================== MAIN BOX ================== */
.container{
    position:relative;
    width:100%;
    max-width:560px;
    margin:60px auto;
    padding:38px;
    border-radius:28px;

    background:
        linear-gradient(
            180deg,
            rgba(48,13,13,0.96),
            rgba(15,5,5,0.96)
        );

    border:1px solid rgba(255,214,122,0.2);

    box-shadow:
        0 0 50px rgba(0,0,0,0.8),
        0 0 20px rgba(255,214,122,0.08),
        inset 0 0 25px rgba(255,214,122,0.03);
}

/* Glow */
.container::before{
    content:"";
    position:absolute;
    inset:-2px;
    border-radius:30px;
    padding:1px;
    background:linear-gradient(
        135deg,
        rgba(255,214,122,0.6),
        transparent,
        rgba(255,214,122,0.3)
    );

    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);

    -webkit-mask-composite:xor;
            mask-composite:exclude;

    pointer-events:none;
}

/* ================== TITLE ================== */
h1{
    text-align:center;
    font-size:2.1rem;
    margin-bottom:35px;
    color:#ffd67a;
    letter-spacing:3px;
    text-transform:uppercase;
    text-shadow:
        0 0 12px rgba(255,214,122,0.45),
        0 0 30px rgba(255,214,122,0.15);
}

h1 span{
    color:#fff;
}

h3{
    margin:22px 0 12px;
    color:#ffcf6b;
    font-size:1rem;
    text-align:center;
    letter-spacing:2px;
}

/* ================== TABLE ================== */
table{
    width:100%;
    border-collapse:collapse;
}

td{
    padding:12px 0;
}

td:first-child{
    width:38%;
    color:#eac06b;
    font-weight:600;
    letter-spacing:.5px;
}

/* ================== INPUT ================== */
input[type="text"],
input[type="password"]{
    width:100%;
    padding:14px 16px;
    border:none;
    outline:none;
    border-radius:14px;

    background:
        linear-gradient(
            180deg,
            rgba(255,255,255,0.04),
            rgba(255,255,255,0.01)
        );

    color:#ffe9b3;
    font-size:15px;

    border:1px solid rgba(255,214,122,0.15);

    transition:.35s;
}

input::placeholder{
    color:#b69252;
}

input:focus{
    border-color:#ffd67a;
    box-shadow:
        0 0 0 4px rgba(255,214,122,0.08),
        0 0 20px rgba(255,214,122,0.12);
    transform:translateY(-1px);
}

/* ================== CAPTCHA ================== */
.captcha{
    display:flex;
    align-items:center;
    gap:12px;
    margin-top:15px;
}

.captcha img{
    border-radius:14px;
    border:1px solid rgba(255,214,122,0.3);
    background:#000;
    padding:4px;
    box-shadow:0 0 18px rgba(255,214,122,0.12);
}

.refresh-btn{
    border:none;
    padding:12px 16px;
    border-radius:12px;
    cursor:pointer;

    background:linear-gradient(
        135deg,
        #a92828,
        #581010
    );

    color:#ffe09a;
    font-weight:bold;
    transition:.3s;
}

.refresh-btn:hover{
    transform:translateY(-2px);
    box-shadow:0 0 15px rgba(255,214,122,0.25);
}

/* ================== BUTTON ================== */
input[type="submit"]{
    width:100%;
    margin-top:28px;
    padding:16px;

    border:none;
    border-radius:16px;

    background:
        linear-gradient(
            135deg,
            #ffb347,
            #d86d1f,
            #7a1c12
        );

    color:white;
    font-size:16px;
    font-weight:700;
    letter-spacing:2px;
    cursor:pointer;

    transition:.35s;
    position:relative;
    overflow:hidden;
}

input[type="submit"]::before{
    content:"";
    position:absolute;
    top:0;
    left:-120%;
    width:80%;
    height:100%;
    background:linear-gradient(
        90deg,
        transparent,
        rgba(255,255,255,0.25),
        transparent
    );
    transition:.7s;
}

input[type="submit"]:hover::before{
    left:140%;
}

input[type="submit"]:hover{
    transform:translateY(-3px);
    box-shadow:
        0 10px 30px rgba(255,140,0,0.35),
        0 0 18px rgba(255,214,122,0.22);
}

/* ================== FOOTER ================== */
footer{
    margin-top:60px;
    padding:24px;
    text-align:center;

    background:
        linear-gradient(
            to top,
            rgba(0,0,0,0.8),
            rgba(20,5,5,0.8)
        );

    color:#c9a35d;
    border-top:1px solid rgba(255,214,122,0.15);
}

footer a{
    color:#ffd67a;
    text-decoration:none;
}

footer a:hover{
    color:white;
}

/* ================== MOBILE ================== */
@media(max-width:768px){

    .menu-icon{
        display:block;
    }

    .navbar{
        display:none;
        flex-direction:column;
        gap:0;
        padding:0;
    }

    .navbar.show{
        display:flex;
    }

    .navbar a{
        width:100%;
        text-align:center;
        border-radius:0;
    }

    .container{
        margin:20px;
        padding:24px;
        border-radius:22px;
    }

    h1{
        font-size:1.6rem;
    }

    .captcha{
        flex-direction:column;
        align-items:flex-start;
    }
}