a#btn_cocacola {
    display: inline-block;
    position: relative;
    width: 220px;
    height: 78px;
    box-sizing: border-box;
    margin: auto;
    margin-top: 95px;
    border-radius: 40px;
    background: linear-gradient(to bottom, #e41f26 0%, #c4121a 100%);
    border: 2px solid rgba(255,255,255,.3);
    text-decoration: none;
    overflow: hidden;
    box-shadow: 0 10px 18px rgba(0,0,0,.18);
}

a#btn_cocacola .coke-text {
    position: relative;
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: white;
    font-family: "Brush Script MT", "Segoe Script", cursive;
    font-size: 34px;
    text-shadow: 0 2px 4px rgba(0,0,0,.18);
}

a#btn_cocacola .coke-wave-svg {
    position: absolute;
    left: 0;
    bottom: -18px;
    width: 100%;
    height: 58px;
    z-index: 2;
    opacity: 0;
    transition: opacity .35s ease, bottom .45s ease;
}

a#btn_cocacola .coke-parallax use:nth-child(1) {
    fill: #4a2412;
}

a#btn_cocacola .coke-parallax use:nth-child(2) {
    fill: #6b3418;
}

a#btn_cocacola .coke-parallax use:nth-child(3) {
    fill: #8a4722;
}

a#btn_cocacola:hover .coke-wave-svg {
    opacity: 1;
    bottom: -8px;
}

a#btn_cocacola:hover .coke-parallax use:nth-child(1) {
    animation: coke-wave-move 7s linear infinite;
    animation-delay: -2s;
}

a#btn_cocacola:hover .coke-parallax use:nth-child(2) {
    animation: coke-wave-move 5s linear infinite;
    animation-delay: -2s;
}

a#btn_cocacola:hover .coke-parallax use:nth-child(3) {
    animation: coke-wave-move 3.5s linear infinite;
    animation-delay: -4s;
}

@keyframes coke-wave-move {
    0% {
        transform: translate(-90px, 0%);
    }
    100% {
        transform: translate(85px, 0%);
    }
}

a#btn_cocacola img {
    position: relative;
    z-index: 3;
    width: 130px;
    margin-top: 15px;
}

/* samsung button */

a#btn_samsung {
    display: inline-block;
    position: relative;
    width: 240px;
    height: 88px;
    margin: auto;
    margin-top: 90px;
    background: #1428a0;
    color: #fff;
    text-decoration: none;
    overflow: hidden;
    box-sizing: border-box;
    border-radius: 50% / 45%;
    transform: rotate(-12deg);
    box-shadow: 0 10px 18px rgba(0,0,0,.18);
}

a#btn_samsung .samsung-label {
    position: absolute;
    inset: 0;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(12deg);
    pointer-events: none;
}

a#btn_samsung .samsung-label img {
    width: 75%;
    max-width: 180px;
    height: auto;
    display: block;
}

a#btn_samsung .samsung-galaxy {
    position: absolute;
    inset: 0;
    z-index: 1;
    opacity: 0;
    transition: opacity .45s ease;
    background:
        radial-gradient(circle at 30% 35%, rgba(105,140,255,.45), transparent 22%),
        radial-gradient(circle at 68% 65%, rgba(152,92,255,.35), transparent 24%),
        radial-gradient(circle at 50% 50%, rgba(255,255,255,.08), transparent 35%),
        linear-gradient(135deg, #02030a 0%, #070b1f 45%, #000000 100%);
}

a#btn_samsung .samsung-stars {
    position: absolute;
    inset: 0;
    z-index: 2;
    opacity: 0;
    transition: opacity .45s ease;
    background:
        radial-gradient(circle at 18% 28%, white 0 1.2px, transparent 1.8px),
        radial-gradient(circle at 34% 62%, rgba(255,255,255,.9) 0 1px, transparent 1.6px),
        radial-gradient(circle at 52% 20%, white 0 1.4px, transparent 2px),
        radial-gradient(circle at 63% 47%, rgba(255,255,255,.85) 0 1px, transparent 1.7px),
        radial-gradient(circle at 78% 31%, white 0 1.2px, transparent 1.9px),
        radial-gradient(circle at 84% 68%, rgba(255,255,255,.95) 0 1.3px, transparent 2px),
        radial-gradient(circle at 25% 78%, rgba(255,255,255,.8) 0 1.1px, transparent 1.8px);
}

a#btn_samsung:hover {
    background: #03050d;
    box-shadow: 0 14px 24px rgba(0,0,0,.28);
}

a#btn_samsung:hover .samsung-galaxy,
a#btn_samsung:hover .samsung-stars {
    opacity: 1;
}

a#btn_samsung:hover .samsung-stars {
    opacity: 1;
    animation: samsung-twinkle 2.6s ease-in-out infinite alternate;
}

@keyframes samsung-twinkle {
    0% {
        transform: translateY(0) scale(1);
        opacity: .8;
    }
    100% {
        transform: translateY(-1px) scale(1.03);
        opacity: 1;
    }
}

/* exploding kittens button */

a#btn_explodingkittens {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 220px;
    height: 80px;
    margin: auto;
    margin-top: 92px;
    background: transparent;
    border-radius: 16px;
    overflow: visible;
    text-decoration: none;
    box-sizing: border-box;
    transition: transform .25s ease;
}

a#btn_explodingkittens .ek-logo {
    position: relative;
    z-index: 2;
    width: 80%;
    height: auto;
    transition: transform .3s ease, opacity .3s ease;
    pointer-events: none;
}

a#btn_explodingkittens .ek-kitten {
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 140px;
    height: auto;
    opacity: 0;
    z-index: 5;
    pointer-events: none;
    transform: translate(-50%, 60px) scale(.6);
    transition: transform .45s cubic-bezier(.2,.8,.2,1.2), opacity .3s ease;
}

a#btn_explodingkittens:hover {
    transform: translateY(-2px);
}

a#btn_explodingkittens:hover .ek-logo {
    transform: translateY(30px) scale(.92);
}

a#btn_explodingkittens:hover .ek-kitten {
    opacity: 1;
    transform: translate(-50%, -45px) scale(0.9);
}

/* npr logo */

a#btn_npr {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
    margin: auto;
    margin-top: 96px;
    text-decoration: none;
    cursor: pointer;
    user-select: none;
    transition: transform .25s ease;
}

a#btn_npr .npr-block {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 34px;
    font-weight: 700;
    color: #ffffff;
    text-transform: lowercase;
    transition: transform .25s ease, filter .25s ease;
}

a#btn_npr .npr-n { background: #d62021; }
a#btn_npr .npr-p { background: #000000; }
a#btn_npr .npr-r { background: #237bbd; }

a#btn_npr:hover {
    transform: translateY(-5px);
}

a#btn_npr:hover .npr-block {
    transform: translateY(-2px);
    filter: brightness(1.3);
}

/* foreflight logo */

a#btn_foreflight {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    width: 180px;
    height: 180px;
    margin: auto;
    margin-top: 55px;
    background: #13233f;
    border-radius: 18px;
    overflow: hidden;
    text-decoration: none;
    box-sizing: border-box;
    box-shadow: 0 10px 18px rgba(0,0,0,.16);
    transition: transform .25s ease, box-shadow .25s ease, background .25s ease;
    cursor: pointer;
    user-select: none;
}

a#btn_foreflight .ff-base {
    position: relative;
    z-index: 1;
    width: 72%;
    height: auto;
    display: block;
    pointer-events: none;
}

a#btn_foreflight .ff-plane {
    position: absolute;
    z-index: 3;
    width: 25%;
    height: auto;
    display: block;
    pointer-events: none;
    transition: transform .7s cubic-bezier(.2,.8,.2,1), opacity .45s ease;
}

a#btn_foreflight:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 26px rgba(0,0,0,.22);
    background: #172b4d;
}

a#btn_foreflight:hover .ff-plane {
    transform: translateY(-70px) scale(0.7);
    opacity: .2;
}

a#btn_foreflight:hover .ff-trail {
    opacity: 1;
}