.btn,
button.btn.btn-6.active 
{
    position: relative;
    padding: 14px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    border-radius: 38px;
    overflow: hidden;
    color: #fff;
    background: #000000;
    transition: 0.3s ease;
    z-index: 0;
}
.btn:hover { color: #fff;}
.btn span {
    position: relative;
    z-index: 2;
}

.btn::before,
.btn::after {
    z-index: 1;
}

/* 1 */
.btn-1::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, #000000, #fd6609);
    transform: translateX(-100%);
    transition: 0.4s;
    z-index: -1;
}
.btn-1:hover::before {
    transform: translateX(0);
    color: #fff;
}

/* 2 */
.btn-2:hover {
    animation: glow 1s infinite alternate;
    color: #ffffff;
    background: #000;
}
@keyframes glow {
    from {box-shadow: 0 0 5px #fa651d;}
    to {box-shadow: 0 0 20px #fa651d;}
}

/* 3 */
.btn-3::before {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 0;
    background: #fa651d;
    transition: 0.4s;
    z-index: -1;
}
.btn-3:hover::before {
    height: 100%;
}

/* 4 */
.btn.btn-4:hover {
    color: #000;
}
.btn-4::after {
    content: "";
    position: absolute;
    inset: 0;
    border: 2px solid #fa651d;
    transform: scale(0);
    transition: 0.3s;
    border-radius: 50px;
}
.btn-4:hover::after {
    transform: scale(1);
}

/* 5 */
.btn-5:active::after {
    content: "";
    position: absolute;
    width: 200%;
    height: 200%;
    background: rgba(255,255,255,0.2);
    top: -50%;
    left: -50%;
    border-radius: 50%;
}

/* 6 */

.btn-6::before {
    content: "";
    position: absolute;
    inset: 0;
    background: #fa651d;
    transform: translateX(-100%);
    transition: 0.4s;
    position: absolute;
    z-index: -1;
}
.btn-6:hover::before {
    transform: translateX(0);
}

.btn-6:hover{ color: #fff; }

/* 7 */
.btn-7 {
    border: 2px solid #fa651d;
}
.btn-7:hover {
    box-shadow: 0 0 15px #fa651d, 0 0 30px #fa651d;
    background: #000;
}

/* 8 */
button.btn.btn-8 {
    position: relative;
    z-index: 1;
}
.btn-8::before {
    content: "";
    position: absolute;
    inset: 0;
    background: #f97316;
    transform: rotate(45deg) scale(0);
    transition: 0.4s;
    z-index: -1;
    border-radius: 50px;
}
.btn-8:hover::before {
    transform: rotate(0) scale(1);
}

/* 9 */
.btn-9 span {
    display: inline-block;
    transition: 0.3s;
}
.btn-9:hover span {
    transform: translateX(5px);
}

/* 10 */
.btn-10:hover {
    transform: translateY(-6px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.4);
}

/* 11 */
.btn-11 {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
}
.btn-11:hover {
    background: rgba(255,255,255,0.2);
}

/* 12 */
.btn-12:hover {
    animation: scalePulse 0.6s;
}
@keyframes scalePulse {
    50% { transform: scale(1.15); }
}

/* 13 */
.btn-13::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2px;
    width: 0;
    background: #0ea5e9;
    transition: 0.3s;
}
.btn-13:hover::after {
    width: 100%;
}

/* 14 */
.btn-14::before {
    content: "";
    position: absolute;
    inset: 0;
    background: #f43f5e;
    transform: translateY(-100%);
    transition: 0.4s;
}
.btn-14:hover::before {
    transform: translateY(0);
}

/* 15 */
.btn-15:hover {
    transform: rotate(3deg) scale(1.05);
}

/* 16 */
.btn-16:hover {
    animation: borderGlow 1s linear infinite;
}
@keyframes borderGlow {
    0% { box-shadow: 0 0 5px #e11d48; }
    50% { box-shadow: 0 0 20px #e11d48; }
    100% { box-shadow: 0 0 5px #e11d48; }
}

/* 17 */
.btn-17:hover {
    filter: blur(1px);
}

/* 18 */
.btn-18::before {
    content: "";
    position: absolute;
    inset: 0;
    background: #84cc16;
    transform: scale(0);
    transition: 0.4s;
}
.btn-18:hover::before {
    transform: scale(1);
}

/* 19 */
.btn-19::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: #06b6d4;
    transition: 0.3s;
}
.btn-19:hover::after {
    width: 100%;
    left: 0;
}

/* 20 */
.btn-20::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 50%;
    height: 100%;
    background: rgba(255,255,255,0.2);
    transform: skewX(-20deg);
}
.btn-20:hover::before {
    left: 150%;
    transition: 0.5s;
}