:root {
    --bg: #0b0d10;
    --card: #12151a;
    --line: #292e36;
    --text: #f2f4f5;
    --muted: #858d98;
    --accent: #b8ff54;
}
* {
    box-sizing: border-box;
}
body {
    margin: 0;
    background-color: var(--bg);
    color: #f2f4f5;
    font-family: Arial, sans-serif;
}
header {
    height: 70px;
    max-width: 1100px;
    margin: auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--line);
}
.logo {
    font-weight: bold;
    font-size: 18px;
}
.logo span {
    color: var(--accent);
}
#theme {
    background: none;
    color: var(--text);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 8px 11px;
    cursor: pointer;
}
main {
    max-width: 1100px;
    margin: auto;
    padding: 50px 20px;
}
.hero {
    min-height: 330px;
    display: grid;
    grid-template-columns: 1.3fr .7fr;
    align-items: center;
}
.tag small {
    color: var(--accent);
    font-size: 10px;
    letter-spacing: 2px;
    font-weight: bold;
}
h1 {
    font-size: clamp(48px, 7vw, 78px);
    line-height: .92;
    letter-spacing: -5px;
    margin: 15px 0;
}
h1 em {
    color: var(--accent);
    font-style: normal;
    font-weight: normal;
}
.intro {
    max-width: 520px;
    color: var(--muted);
    line-height: 1.7;
}
.heart{
    height: 230px;
    display: grid;
    place-items: center;
    position: relative;
}
.dot {
    width: 28px;
    height: 28px;
    background: var(--accent);
    border-radius: 50%;
    box-shadow: 0 0 50px var(--accent);
    animation: pulse 1s infinite;
}
.wave {
    position: absolute;
    color: var(--accent);
    font-size: 28px;
    opacity: .6;
    animation: move 2s linear infinite;
}
.checker {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 15px;
    align-items: center;
    padding: 12px 15px;
    border: 1px solid var(--line);
    border-radius: 10px;
    background: var(--card);
}
.checker span {
    color: var(--muted);
    font-size: 9px;
    letter-spacing: 2px;
}
.checker input {
    width: 100%;
    background: none;
    border: 0;
    outline: 0;
    color: var(--text);
    font-size: 15px;
}
#check {
    border: 0;
    background: var(--accent);
    color: #111;
    padding: 13px 17px;
    border-radius: 7px;
    font-weight: bold;
    cursor: pointer;
}
.grid {
    margin-top: 15px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}
.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 23px;
    min-height: 190px;
}
.card h2 {
    margin: 7px 0 25px;
    font-size: 17px;
}
.score {
    display: flex;
    align-items: baseline;
    gap: 6px;
}
.score strong,
.number strong {
    font-size: 55px;
    letter-spacing: -4px;
}
.score span,
.number span {
    color: var(--muted);
}
.card p {
    color: var(--muted);
    font-size: 12px;
    line-height: 1.5;
}
.bar {
    height: 5px;
    background: #20242a;
    margin-top: 20px;
    border-radius: 10px;
    overflow: hidden;
}
.bar i {
    display: block;
    width: 0;
    height: 100%;
    background: var(--accent);
    transition: .6s;
}
.connection {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
}
.connection i {
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
}
.wide {
    grid-column: 1 / -1;
}
#log {
    border-top: 1px solid var(--line);
}
#log p {
    border-bottom: 1px solid var(--line);
    padding: 12px 0;
    margin: 0;
}
footer {
    max-width: 1100px;
    margin: auto;
    padding: 20px;
    border-top: 1px solid var(--line);
    color: var(--muted);
    font-size: 10px;
    display: flex;
    justify-content: space-between;
}
@keyframes pulse {
    50%{
        transform: scale(1.3);
        opacity: .6;
    }
}
@keyframes move {
    50% {
        transform: translateX(20px);
    }
}
@media (max-width: 700px) {
    .hero {
        grid-template-columns: 1fr;
    }
    .heart {
        height: 140px;
    }
    .checker {
        grid-template-columns: 1fr;
    }
    .grid {
        grid-template-columns: 1fr;
    }
    .wide {
        grid-column: auto;
    }
    h1 {
        letter-spacing: -3px;
    }
    footer {
        flex-direction: column;
        gap: 8px;
    }
}