/* 极简、无依赖、跟随系统深色 */

:root {
    --bg: #0d0d10;
    --card: #17171c;
    --card-hi: #1e1e25;
    --line: #2a2a33;
    --text: #ececf1;
    --muted: #8b8b99;
    --accent: #6c8cff;
    --ok: #4ade80;
    --warn: #fbbf24;
    --error: #f87171;
    --radius: 14px;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    -webkit-font-smoothing: antialiased;
}

main {
    max-width: 420px;
    margin: 0 auto;
    padding: 32px 20px calc(32px + env(safe-area-inset-bottom));
    display: flex;
    flex-direction: column;
    gap: 14px;
}

header {
    text-align: center;
    margin-bottom: 6px;
}

h1 {
    margin: 0;
    font-size: 21px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.sub {
    margin: 6px 0 0;
    font-size: 12.5px;
    color: var(--muted);
    letter-spacing: 0.04em;
}

.card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 16px;
}

/* ---- 连接 ---- */

.connect-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: stretch;
}

#connect {
    width: 100%;
    padding: 14px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    background: var(--card-hi);
    border: 1px solid var(--line);
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, opacity 0.15s;
}

#connect:hover:not(:disabled) {
    background: #252530;
    border-color: #3a3a47;
}

#connect.connected {
    color: var(--accent);
    border-color: rgba(108, 140, 255, 0.45);
    background: rgba(108, 140, 255, 0.09);
}

#connect:disabled {
    opacity: 0.55;
    cursor: default;
}

.status-row {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13.5px;
    color: var(--muted);
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--muted);
    flex: 0 0 auto;
}

/* 未连接：沿用基色的灰色，这里显式写出来便于按语义读样式 */
.dot.idle {
    background: var(--muted);
}

.dot.ok {
    background: var(--ok);
    box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.15);
}

.dot.pending {
    background: var(--warn);
    animation: pulse 1s ease-in-out infinite;
}

.dot.error {
    background: var(--error);
}

@keyframes pulse {
    50% {
        opacity: 0.3;
    }
}

.device,
.battery {
    margin: 0;
    font-size: 12.5px;
    color: var(--muted);
    font-variant-numeric: tabular-nums;
    min-height: 0;
}

.device:empty,
.battery:empty {
    display: none;
}

/* ---- 滑杆 ---- */

.motor {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.motor label {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
}

.motor-name {
    font-size: 14.5px;
    font-weight: 500;
}

.motor-value {
    color: var(--muted);
    font-size: 12.5px;
    font-variant-numeric: tabular-nums;
}

.motor-value b {
    font-size: 19px;
    font-weight: 600;
    color: var(--text);
    margin-right: 2px;
}

.motor-value i {
    font-style: normal;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 30px;
    margin: 0;
    background: transparent;
    cursor: pointer;
}

input[type="range"]:disabled {
    opacity: 0.35;
    cursor: default;
}

/* 轨道 */
input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 3px;
    background: var(--line);
}

input[type="range"]::-moz-range-track {
    height: 6px;
    border-radius: 3px;
    background: var(--line);
}

/* 滑块 */
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 24px;
    height: 24px;
    margin-top: -9px;
    border-radius: 50%;
    background: var(--text);
    border: none;
    box-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
    transition: transform 0.1s;
}

input[type="range"]:active::-webkit-slider-thumb {
    transform: scale(1.12);
}

input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border: none;
    border-radius: 50%;
    background: var(--text);
    box-shadow: 0 1px 6px rgba(0, 0, 0, 0.5);
}

input[type="range"]:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
    border-radius: 4px;
}

/* ---- 停止 ---- */

.stop {
    width: 100%;
    padding: 15px;
    font-size: 15px;
    font-weight: 600;
    color: #ffd9d9;
    background: rgba(248, 113, 113, 0.12);
    border: 1px solid rgba(248, 113, 113, 0.35);
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.15s, opacity 0.15s;
}

.stop:hover:not(:disabled) {
    background: rgba(248, 113, 113, 0.2);
}

.stop:disabled {
    opacity: 0.35;
    cursor: default;
}

/* ---- 提示 ---- */

.note {
    margin: 0;
    font-size: 12.5px;
    line-height: 1.65;
    color: var(--warn);
    min-height: 0;
}

.note:empty {
    display: none;
}

footer {
    margin-top: 10px;
    text-align: center;
    font-size: 11.5px;
    line-height: 1.7;
    color: #5c5c6b;
}

footer p {
    margin: 0;
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f6f6f8;
        --card: #ffffff;
        --card-hi: #f0f0f4;
        --line: #e0e0e6;
        --text: #17171c;
        --muted: #6b6b7a;
    }

    .stop {
        color: #b42318;
        background: rgba(248, 113, 113, 0.14);
        border-color: rgba(220, 38, 38, 0.3);
    }

    input[type="range"]::-webkit-slider-thumb {
        background: #3a3a47;
    }

    input[type="range"]::-moz-range-thumb {
        background: #3a3a47;
    }

    footer {
        color: #9a9aa6;
    }
}