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

html{
    min-height:100%;
}

body{
    position:relative;
    min-height:100vh;
    padding:20px;
    background:
        radial-gradient(circle at 18% 8%, rgba(126,187,255,.22), transparent 22rem),
        radial-gradient(circle at 82% 22%, rgba(255,213,128,.16), transparent 20rem),
        radial-gradient(circle at 50% 100%, rgba(145,197,169,.16), transparent 26rem),
        linear-gradient(145deg, #121723 0%, #223047 36%, #43576f 70%, #6c7f8f 100%);
    color:#fff;
    font-family:Arial, Helvetica, sans-serif;
    overflow-x:hidden;
}

.container{
    position:relative;
    z-index:1;
    width:100%;
    max-width:650px;
    margin:0 auto;
    display:flex;
    flex-direction:column;
}

.app-splash{
    position:fixed;
    inset:0;
    z-index:20;
    display:grid;
    place-items:center;
    padding:28px;
    background:
        radial-gradient(circle at 18% 8%, rgba(126,187,255,.26), transparent 22rem),
        radial-gradient(circle at 82% 24%, rgba(255,213,128,.18), transparent 20rem),
        radial-gradient(circle at 50% 96%, rgba(145,197,169,.18), transparent 26rem),
        linear-gradient(145deg, #0d121e 0%, #1e2d45 48%, #4a5f76 100%);
    transition:opacity .42s ease, visibility .42s ease;
}

.app-splash.hidden{
    opacity:0;
    visibility:hidden;
}

.splash-card{
    display:grid;
    justify-items:center;
    gap:22px;
    text-align:center;
    animation:splashRise .85s cubic-bezier(.2,.8,.2,1) both;
}

.splash-orbit{
    position:relative;
    width:190px;
    height:190px;
    display:grid;
    place-items:center;
}

.splash-orbit::before{
    content:"";
    position:absolute;
    inset:26px;
    border-radius:50%;
    background:radial-gradient(circle, rgba(255,216,77,.24), transparent 66%);
    animation:splashFlash 1.35s ease-in-out infinite;
}

.splash-orbit span{
    position:absolute;
    inset:0;
    border:1px solid rgba(255,255,255,.22);
    border-radius:50%;
    animation:splashRing 1.6s ease-out infinite;
}

.splash-orbit span:nth-child(2){
    inset:20px;
    animation-delay:.32s;
    border-color:rgba(255,216,77,.26);
}

.splash-orbit img{
    position:relative;
    z-index:1;
    width:132px;
    height:132px;
    border-radius:30px;
    box-shadow:
        0 20px 48px rgba(0,0,0,.32),
        0 0 34px rgba(255,216,77,.18);
}

.splash-title{
    color:#fff;
    font-size:clamp(1.55rem, 8vw, 2.1rem);
    font-weight:700;
    line-height:1.1;
    text-shadow:0 2px 14px rgba(0,0,0,.28);
}

.splash-subtitle{
    margin-top:8px;
    color:rgba(255,255,255,.76);
    font-size:.95rem;
}

.splash-loader{
    width:min(260px, 62vw);
    height:5px;
    overflow:hidden;
    background:rgba(255,255,255,.16);
    border-radius:999px;
}

.splash-loader span{
    display:block;
    width:45%;
    height:100%;
    border-radius:999px;
    background:linear-gradient(90deg, #7ebbff, #ffd84d);
    animation:splashLoad 1.05s ease-in-out infinite;
}

.title-row{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:12px;
    margin:15px 0 25px;
}

.header-logo{
    width:36px;
    height:36px;
    flex:0 0 auto;
}

h1{
    font-size:clamp(1.45rem, 6vw, 2rem);
    font-weight:700;
    line-height:1.15;
    text-align:center;
}

.timer{
    width:420px;
    max-width:100%;
    min-height:140px;
    margin:0 auto 25px;
    display:flex;
    justify-content:center;
    align-items:center;
    background:#0b0b0b;
    border:2px solid rgba(255,255,255,.08);
    border-radius:20px;
    box-shadow:
        inset 0 0 30px rgba(0,0,0,.8),
        0 8px 25px rgba(0,0,0,.25);
    color:#fff;
    font-family:"Orbitron", Arial, Helvetica, sans-serif;
    font-size:clamp(2.25rem, 11vw, 3.5rem);
    font-variant-numeric:tabular-nums;
    font-weight:700;
    letter-spacing:0;
    text-shadow:0 0 4px rgba(255,255,255,.4);
}

.action-button,
.secondary-button{
    width:100%;
    border:0;
    border-radius:18px;
    color:#fff;
    cursor:pointer;
    font-weight:700;
}

.action-button{
    min-height:80px;
    padding:14px 18px;
    background:#22c55e;
    box-shadow:0 6px 18px rgba(34,197,94,.30);
    font-size:clamp(1.35rem, 6vw, 1.7rem);
}

.action-button.stop{
    background:#f97316;
    animation:breathing 1.5s infinite ease-in-out;
    box-shadow:0 0 20px rgba(249,115,22,.45);
}

.secondary-button{
    min-height:55px;
    margin-top:10px;
    padding:12px 16px;
    background:rgba(255,255,255,.12);
    font-size:1rem;
}

@keyframes breathing{
    0%{
        transform:scale(1);
        box-shadow:0 0 20px rgba(249,115,22,.45);
    }

    50%{
        transform:scale(1.03);
        box-shadow:0 0 35px rgba(249,115,22,.65);
    }

    100%{
        transform:scale(1);
        box-shadow:0 0 20px rgba(249,115,22,.45);
    }
}

@keyframes splashRise{
    0%{
        opacity:0;
        transform:translateY(18px) scale(.96);
    }

    100%{
        opacity:1;
        transform:translateY(0) scale(1);
    }
}

@keyframes splashFlash{
    0%,
    100%{
        opacity:.45;
        transform:scale(.92);
    }

    50%{
        opacity:1;
        transform:scale(1.08);
    }
}

@keyframes splashRing{
    0%{
        opacity:.62;
        transform:scale(.72);
    }

    100%{
        opacity:0;
        transform:scale(1.18);
    }
}

@keyframes splashLoad{
    0%{
        transform:translateX(-115%);
    }

    100%{
        transform:translateX(255%);
    }
}

.result{
    margin-top:25px;
    padding:25px;
    border-radius:20px;
    backdrop-filter:blur(6px);
    border:1px solid rgba(255,255,255,.14);
    box-shadow:0 16px 38px rgba(0,0,0,.24);
    text-align:center;
    animation:resultFade .35s ease;
}

.result-danger{
    background:linear-gradient(160deg, rgba(255,90,90,.22), rgba(255,255,255,.08));
}

.result-warning{
    background:linear-gradient(160deg, rgba(255,165,0,.22), rgba(255,255,255,.08));
}

.result-medium{
    background:linear-gradient(160deg, rgba(255,220,120,.20), rgba(255,255,255,.08));
}

.result-far{
    background:linear-gradient(160deg, rgba(120,220,120,.20), rgba(255,255,255,.08));
}

.result-veryfar{
    background:linear-gradient(160deg, rgba(255,255,255,.13), rgba(255,255,255,.07));
}

.distance{
    margin-bottom:12px;
    color:#fff;
    font-size:clamp(3.2rem, 16vw, 4.8rem);
    font-weight:800;
    letter-spacing:0;
    animation:distancePop .35s ease;
}

.distance-danger{
    text-shadow:0 0 16px rgba(255,107,107,.62);
}

.distance-warning{
    text-shadow:0 0 16px rgba(255,184,77,.62);
}

.distance-medium{
    text-shadow:0 0 16px rgba(255,224,130,.55);
}

.distance-far{
    text-shadow:0 0 16px rgba(126,231,135,.52);
}

.distance-veryfar{
    text-shadow:0 0 16px rgba(255,255,255,.32);
}

.proximity-bar{
    position:relative;
    width:100%;
    max-width:380px;
    height:22px;
    margin:20px auto 8px;
    overflow:hidden;
    background:
        linear-gradient(90deg, rgba(255,107,107,.34), rgba(255,184,77,.28), rgba(255,224,130,.24), rgba(126,231,135,.24), rgba(209,213,219,.20));
    border-radius:999px;
    border:1px solid rgba(255,255,255,.18);
    box-shadow:
        inset 0 1px 5px rgba(0,0,0,.38),
        0 8px 18px rgba(0,0,0,.14);
}

.proximity-bar::after{
    content:"";
    position:absolute;
    inset:0;
    background:
        linear-gradient(90deg, transparent 19%, rgba(255,255,255,.30) 20%, transparent 21%),
        linear-gradient(90deg, transparent 39%, rgba(255,255,255,.26) 40%, transparent 41%),
        linear-gradient(90deg, transparent 59%, rgba(255,255,255,.22) 60%, transparent 61%),
        linear-gradient(90deg, transparent 79%, rgba(255,255,255,.18) 80%, transparent 81%);
    pointer-events:none;
}

.proximity-fill{
    height:100%;
    border-radius:999px;
    box-shadow:
        inset 0 1px 0 rgba(255,255,255,.32),
        0 0 14px rgba(255,255,255,.28);
}

.fill-danger{
    width:100%;
    background:linear-gradient(90deg, #ff4d5f, #ff9f43);
}

.fill-warning{
    width:80%;
    background:linear-gradient(90deg, #ff8a3d, #ffd166);
}

.fill-medium{
    width:60%;
    background:linear-gradient(90deg, #ffd166, #f9f871);
}

.fill-far{
    width:35%;
    background:linear-gradient(90deg, #8be28f, #48d6a8);
}

.fill-veryfar{
    width:15%;
    background:linear-gradient(90deg, #e5e7eb, #9ad7ff);
}

.bar-labels{
    width:100%;
    max-width:380px;
    margin:0 auto 14px;
    display:flex;
    justify-content:space-between;
    color:rgba(255,255,255,.70);
    font-size:.82rem;
}

.proximity{
    margin-bottom:15px;
    padding-top:14px;
    border-top:1px solid rgba(255,255,255,.12);
    font-size:1.3rem;
    font-weight:700;
}

.message{
    line-height:1.6;
}

.elapsed-time{
    margin-top:18px;
    color:rgba(255,255,255,.82);
}

.info-box{
    margin-top:20px;
    padding:0;
    overflow:hidden;
    background:linear-gradient(160deg, rgba(255,255,255,.13), rgba(255,255,255,.07));
    border:1px solid rgba(255,255,255,.14);
    border-radius:18px;
    box-shadow:0 10px 26px rgba(0,0,0,.14);
}

.history-box{
    margin-top:20px;
    padding:0;
    overflow:hidden;
    background:rgba(255,255,255,.07);
    border:1px solid rgba(255,255,255,.11);
    border-radius:14px;
}

.info-box summary,
.history-box summary{
    position:relative;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
    min-height:58px;
    padding:16px 18px;
    cursor:pointer;
    font-size:1rem;
    font-weight:700;
    list-style:none;
}

.history-box summary{
    color:rgba(255,255,255,.82);
}

.info-box summary::-webkit-details-marker{
    display:none;
}

.history-box summary::-webkit-details-marker{
    display:none;
}

.info-box summary::after{
    content:"+";
    width:30px;
    height:30px;
    display:grid;
    place-items:center;
    flex:0 0 auto;
    border-radius:999px;
    background:rgba(255,255,255,.14);
    color:#ffe082;
    font-size:1.2rem;
    line-height:1;
}

.history-box summary::after{
    content:"+";
    width:26px;
    height:26px;
    display:grid;
    place-items:center;
    flex:0 0 auto;
    border-radius:999px;
    background:rgba(255,255,255,.10);
    color:#ffd84d;
    font-size:1rem;
    line-height:1;
}

.info-box[open] summary::after{
    content:"-";
}

.history-box[open] summary::after{
    content:"-";
}

.info-box[open] summary{
    border-bottom:1px solid rgba(255,255,255,.10);
}

.history-box[open] summary{
    border-bottom:1px solid rgba(255,255,255,.08);
}

.info-box p,
.info-box li,
.history-level,
.history-time,
.history-distance,
.history-evolution,
.ghost-button{
    font-size:1rem;
}

.info-box p,
.info-box li{
    line-height:1.7;
}

.info-box p{
    padding:16px 18px 0;
    color:rgba(255,255,255,.88);
}

.info-box ul{
    margin:10px 18px 18px 36px;
    color:rgba(255,255,255,.90);
}

.info-box li + li{
    margin-top:6px;
}

.history-list{
    display:grid;
    gap:8px;
    padding:12px 14px 0;
    list-style:none;
}

.history-item{
    display:grid;
    gap:6px 12px;
    padding:10px 0;
    border-bottom:1px solid rgba(255,255,255,.08);
}

.history-main{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:10px;
}

.history-item:last-child{
    border-bottom:0;
}

.history-distance{
    color:#fff;
    font-weight:700;
}

.history-time{
    color:rgba(255,255,255,.68);
}

.history-level{
    grid-column:1 / -1;
    color:rgba(255,255,255,.78);
}

.delete-measurement-button{
    width:30px;
    height:30px;
    display:grid;
    place-items:center;
    flex:0 0 auto;
    border:1px solid rgba(255,255,255,.12);
    border-radius:999px;
    background:rgba(255,255,255,.08);
    color:rgba(255,255,255,.76);
    cursor:pointer;
    font-size:1.15rem;
    line-height:1;
}

.delete-measurement-button:active{
    transform:translateY(1px);
}

.history-evolution{
    margin:12px 14px 0;
    padding:14px;
    background:linear-gradient(160deg, rgba(255,255,255,.13), rgba(255,255,255,.06));
    border:1px solid rgba(255,255,255,.13);
    border-radius:14px;
    box-shadow:0 12px 28px rgba(0,0,0,.14);
    color:rgba(255,255,255,.88);
    line-height:1.45;
}

.evolution-head{
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:12px;
}

.evolution-head strong{
    color:#fff;
    font-size:.98rem;
    text-align:right;
}

.evolution-badge{
    min-width:78px;
    padding:6px 9px;
    border-radius:999px;
    color:#fff;
    font-size:.78rem;
    font-weight:800;
    text-align:center;
}

.evolution-badge.closer{
    background:linear-gradient(90deg, #ff4d5f, #ff9f43);
}

.evolution-badge.away{
    background:linear-gradient(90deg, #48d6a8, #7ebbff);
}

.evolution-badge.stable{
    background:linear-gradient(90deg, #ffd166, #f9f871);
    color:#1f2a3a;
}

.evolution-stats{
    display:grid;
    grid-template-columns:repeat(3, 1fr);
    gap:8px;
    margin-top:14px;
}

.evolution-stats div{
    padding:10px 8px;
    background:rgba(255,255,255,.08);
    border:1px solid rgba(255,255,255,.08);
    border-radius:12px;
}

.evolution-stats span{
    display:block;
    color:rgba(255,255,255,.64);
    font-size:.75rem;
}

.evolution-stats strong{
    display:block;
    margin-top:4px;
    color:#fff;
    font-size:1rem;
}

.evolution-chart{
    position:relative;
    height:118px;
    margin-top:16px;
    padding:0 10px 22px;
    display:flex;
    align-items:stretch;
    justify-content:space-between;
    background:
        linear-gradient(rgba(255,255,255,.08) 1px, transparent 1px) 0 14px / 100% 34px;
    border-bottom:1px solid rgba(255,255,255,.16);
}

.evolution-chart::before{
    content:"";
    position:absolute;
    left:16px;
    right:16px;
    bottom:22px;
    height:2px;
    background:linear-gradient(90deg, rgba(126,187,255,.28), rgba(255,216,77,.42));
}

.evolution-chart span{
    position:relative;
    width:22px;
}

.evolution-chart img{
    position:absolute;
    left:50%;
    top:var(--value);
    width:26px;
    height:26px;
    object-fit:contain;
    filter:drop-shadow(0 0 10px rgba(255,216,77,.36)) drop-shadow(0 6px 8px rgba(0,0,0,.22));
    transform:translate(-50%, -50%);
}

.evolution-chart em{
    position:absolute;
    display:block;
    left:50%;
    top:var(--value);
    width:1px;
    height:42px;
    background:linear-gradient(rgba(255,216,77,.42), transparent);
    transform:translate(-50%, 12px);
}

.evolution-chart b{
    position:absolute;
    left:50%;
    bottom:-2px;
    color:rgba(255,255,255,.66);
    font-size:.68rem;
    font-weight:700;
    white-space:nowrap;
    transform:translateX(-50%);
}

.history-evolution p{
    margin-top:12px;
    color:rgba(255,255,255,.82);
    font-size:.92rem;
}

.history-actions{
    display:flex;
    gap:8px;
    padding:12px 14px 14px;
}

.history-top-actions{
    align-items:center;
    justify-content:space-between;
    padding-bottom:0;
}

.history-bottom-actions{
    padding-top:12px;
}

.ghost-button{
    min-height:38px;
    padding:8px 12px;
    border:1px solid rgba(255,255,255,.13);
    border-radius:12px;
    background:rgba(255,255,255,.08);
    color:rgba(255,255,255,.88);
    cursor:pointer;
    font-weight:700;
}

.ghost-button:active{
    transform:translateY(1px);
}

.ghost-button:disabled{
    opacity:.55;
    cursor:not-allowed;
}

.ghost-button:disabled:active{
    transform:none;
}

.danger-button{
    margin-left:auto;
    color:#ffd7d7;
    border-color:rgba(255,107,107,.24);
    background:rgba(255,107,107,.10);
}

.mobile-clear-button{
    display:none;
}

.hidden{
    display:none;
}

@keyframes resultFade{
    from{
        opacity:0;
        transform:translateY(12px);
    }

    to{
        opacity:1;
        transform:translateY(0);
    }
}

@keyframes distancePop{
    0%{
        opacity:.5;
        transform:scale(.90);
    }

    100%{
        opacity:1;
        transform:scale(1);
    }
}

@media (max-width:600px){
    body{
        padding:16px;
    }

    .timer{
        min-height:110px;
    }

    .result{
        padding:22px 18px;
    }

    .history-actions{
        flex-direction:column;
    }

    .history-actions .ghost-button{
        width:100%;
    }

    .danger-button{
        margin-left:0;
    }

    .history-top-actions .danger-button{
        display:none;
    }

    .mobile-clear-button{
        display:block;
    }

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

    .evolution-head strong{
        text-align:left;
    }

    .evolution-stats{
        grid-template-columns:1fr;
    }

    .evolution-chart b{
        font-size:.62rem;
    }
}