:root {
    --accent-color: #e040fb;
    --accent-color-light: #f0a0ff;
    --text-color: #ffffff;
    --light-text-color: rgba(255, 255, 255, 0.7);
    --border-color: rgba(255, 255, 255, 0.2);
    --bg-color: #1a1a1a;
    --glass-bg: rgba(22, 22, 32, 0.45);
}

html {
    min-height: 100%;
    overflow-y: scroll; 
}

body {
    border: none; padding: 0; margin: 0;
    background-color: var(--bg-color);
    background-image: url('https://t.alcy.cc/ycy');
    background-size: cover;
    background-position: center center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    font-family: 'Poppins', "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    color: var(--text-color);
}

#loader {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-color);
    display: flex; justify-content: center; align-items: center;
    z-index: 9999; opacity: 1;
    transition: opacity 0.5s ease, visibility 0.5s ease;
    visibility: visible;
}
.spinner {
    width: 50px; height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
body.loaded #loader { opacity: 0; visibility: hidden; }

.speedtest-wrapper {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 40px; border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    display: flex; align-items: center; gap: 60px;
    width: 850px;
    box-sizing: border-box;
    opacity: 0; transform: translateY(20px);
    transition: opacity 0.5s ease 0.2s, transform 0.5s ease 0.2s;
}
body.loaded .speedtest-wrapper { opacity: 1; transform: translateY(0); }

.gauge-section { flex-shrink: 0; text-align: center; display: flex; flex-direction: column; align-items: center; }
.gauge-assembly { position: relative; width: 320px; height: 160px; margin-bottom: 10px; }
.gauge-svg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; }
.gauge-track, .gauge-progress { fill: none; stroke-width: 20; stroke-linecap: round; }
.gauge-track { stroke: rgba(255, 255, 255, 0.15); }
.gauge-progress { stroke: url(#downloadGradient); stroke-dasharray: 440; stroke-dashoffset: 440; transition: stroke-dashoffset 0.5s ease-out, stroke 0.4s ease; }
.gauge-labels { position: absolute; width: 100%; height: 100%; top: 0; left: 0; color: var(--light-text-color); font-size: 14px; }
.gauge-labels span { position: absolute; transform: translateX(-50%); }
.gauge-labels .label-0 { bottom: -10px; left: 15px; } .gauge-labels .label-10 { bottom: 30px; left: 45px; } .gauge-labels .label-50 { top: 30px; left: 95px; } .gauge-labels .label-100 { top: 0px; left: 160px; } .gauge-labels .label-250 { top: 30px; right: 95px; transform: translateX(50%);} .gauge-labels .label-500 { bottom: 30px; right: 45px; transform: translateX(50%);} .gauge-labels .label-1000 { bottom: -10px; right: 15px; transform: translateX(50%);}
.gauge-display { position: absolute; top: 60%; left: 50%; transform: translate(-50%, -50%); z-index: 4; }
.speed-value { font-size: 48px; font-weight: 600; color: var(--text-color); line-height: 1.1; font-variant-numeric: tabular-nums; }
.speed-unit { font-size: 18px; color: var(--light-text-color); }
.download-label { color: var(--light-text-color); font-size: 16px; margin-top: 5px; }

.results-section { flex-grow: 1; display: flex; flex-direction: column; align-items: center; height: 100%; }
.results-grid { display: grid; grid-template-columns: repeat(2, minmax(100px, 1fr)); gap: 25px 50px; width: 100%; }
.result-item .label { display: flex; align-items: center; gap: 8px; font-size: 15px; color: var(--light-text-color); margin-bottom: 8px; }
.result-item .label svg { width: 16px; height: 16px; fill: var(--light-text-color); }
.result-item .value { font-size: 28px; font-weight: 500; color: var(--text-color); text-align: left; font-variant-numeric: tabular-nums; min-height: 36px; display: flex; align-items: center; }

.info-slider { position: relative; width: 100%; height: 2px; margin: auto 0 15px; }
.info-track-bg { position: absolute; top: 0; left: 0; width: 100%; height: 2px; background-color: var(--border-color); border-radius: 1px; }
#wave-container { position: absolute; top: -10px; left: 0; width: 100%; height: 22px; overflow: hidden; display: none; }
#wave-path { stroke: var(--accent-color); stroke-width: 1.5; fill: none; }
.speedtest-wrapper.running #wave-container, .speedtest-wrapper.finished #wave-container { display: block; }

.info-icon { position: absolute; top: 50%; transform: translateY(-50%); color: var(--light-text-color); }
.info-icon svg { width: 18px; height: 18px; fill: currentColor; }
.icon-home { left: -30px; }
.icon-server { right: -30px; }

.info-display { margin-top: 15px; width: 100%; display: flex; flex-direction: column; align-items: flex-start; gap: 4px; font-size: 13px; color: var(--light-text-color); min-height: 50px; }
.info-display div { text-align: left; }

#evaluationText { color: var(--accent-color-light); font-size: 14px; margin-top: 15px; font-weight: 500; min-height: 40px; display: flex; align-items: center; justify-content: center; text-align: center; opacity: 0; transition: opacity 0.5s ease; }

#startStopBtn { margin-top: auto; font-size: 16px; font-weight: 500; padding: 10px 45px; border-radius: 20px; cursor: pointer; transition: all 0.3s ease; border: 1px solid var(--border-color); color: var(--text-color); background: transparent; }
#startStopBtn:hover { background: rgba(255, 255, 255, 0.1); border-color: rgba(255, 255, 255, 0.5); }
#startStopBtn.running { color: var(--text-color); background: var(--accent-color); border-color: var(--accent-color); }

@media (max-width: 900px) { .speedtest-wrapper { width: 95%; gap: 30px; height: auto; } .results-grid { grid-template-columns: repeat(2, minmax(140px, 1fr)); } .info-icon { display: none; } }
@media (max-width: 768px) { body { padding: 15px; } .speedtest-wrapper { flex-direction: column; padding: 25px; gap: 20px; width: 100%; height: auto; } .results-section { width: 100%; } }