:root {
    --bg: #0e0e0e;
    --surface: #161616;
    --border: #2a2a2a;
    --border-lite: #1e1e1e;

    --text: #d8d8d8;
    --text-muted: #555;
    --label: #3a3a3a;

    --accent: #e8320a;
    --accent-arm: #e8a30a;
    --on: #2ecc71;
    --off: #333;

    --font-mono: "Share Tech Mono", monospace;
    --font-ui: "Barlow", sans-serif;

    --radius: 4px;
    --dpad-size: clamp(100px, 18vw, 150px);
    --btn-size: clamp(32px, 5.5vw, 52px);
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

html,
body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-ui);
    touch-action: none;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 36px;
    padding: 0 14px;
    border-bottom: 1px solid var(--border);
    background: var(--surface);
    flex-shrink: 0;
}

.title {
    font-family: var(--font-mono);
    font-size: 15px;
    letter-spacing: 0.12em;
    color: var(--text);
    font-weight: normal;
}

.title-accent {
    color: var(--accent);
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 7px;
    min-width: 130px;
}

.header-right {
    justify-content: flex-end;
}

.label {
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.18em;
    color: var(--text-muted);
}

.indicator {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    flex-shrink: 0;
    transition: background 0.3s;
}

.indicator--off {
    background: var(--off);
}
.indicator--on {
    background: var(--on);
}
.indicator--warn {
    background: var(--accent-arm);
}

.status-text {
    font-family: var(--font-mono);
    font-size: 9px;
    letter-spacing: 0.12em;
    color: var(--text-muted);
    transition: color 0.3s;
}

.status-text.active {
    color: var(--on);
}

main {
    display: grid;
    grid-template-columns: 1fr 1px 1fr;
    grid-template-rows: 1fr 1px 1fr;
    width: 100%;
    height: calc(100vh - 36px);
}

.panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    position: relative;
    padding: 6px;
}

.panel-label {
    font-family: var(--font-mono);
    font-size: 8px;
    letter-spacing: 0.2em;
    color: var(--label);
    position: absolute;
    top: 8px;
    left: 12px;
}

.v-divider {
    grid-row: 1;
    background: var(--border);
    width: 1px;
}

.v-divider--bottom {
    grid-row: 3;
}

.h-divider {
    grid-column: 1 / -1;
    height: 1px;
    background: var(--border);
}

#panel-move-joy {
    grid-column: 1;
    grid-row: 1;
}
#panel-arm-joy {
    grid-column: 3;
    grid-row: 1;
}

.joystick-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
}

#panel-move-dpad {
    grid-column: 1;
    grid-row: 3;
}
#panel-pince-dpad {
    grid-column: 3;
    grid-row: 3;
}

.dpad {
    display: grid;
    grid-template-columns: var(--btn-size) var(--btn-size) var(--btn-size);
    grid-template-rows: var(--btn-size) var(--btn-size) var(--btn-size);
    gap: 3px;
}

.dpad-up {
    grid-column: 2;
    grid-row: 1;
}
.dpad-left {
    grid-column: 1;
    grid-row: 2;
}
.dpad-center {
    grid-column: 2;
    grid-row: 2;
    display: flex;
    align-items: center;
    justify-content: center;
}
.dpad-right {
    grid-column: 3;
    grid-row: 2;
}
.dpad-down {
    grid-column: 2;
    grid-row: 3;
}

.dpad-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    font-size: clamp(11px, 2vw, 16px);
    border-radius: var(--radius);
    cursor: pointer;
    transition:
        background 0.08s,
        border-color 0.08s,
        color 0.08s;
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 100%;
    touch-action: none;
}

.dpad-btn:active,
.dpad-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.dpad-btn--accent:active,
.dpad-btn--accent.active {
    background: var(--accent-arm);
    border-color: var(--accent-arm);
    color: #000;
}

.dpad-stop {
    font-size: clamp(9px, 1.6vw, 13px);
    background: var(--bg);
    border-color: var(--border);
    color: var(--text-muted);
}

.dpad-stop:active {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}

.dpad-icon {
    font-size: clamp(10px, 1.6vw, 13px);
    color: var(--label);
    font-family: var(--font-mono);
}

#panel-move-joy::after,
#panel-arm-joy::after {
    content: attr(data-id);
    position: absolute;
    bottom: 8px;
    right: 12px;
    font-family: var(--font-mono);
    font-size: 8px;
    letter-spacing: 0.15em;
    color: var(--border);
}

#panel-move-joy {
    border-top: 2px solid var(--accent);
}
#panel-move-dpad {
    border-bottom: 2px solid var(--accent);
}
#panel-arm-joy {
    border-top: 2px solid var(--accent-arm);
}
#panel-pince-dpad {
    border-bottom: 2px solid var(--accent-arm);
}

@media (max-height: 340px) {
    header {
        height: 28px;
    }
    .title {
        font-size: 12px;
    }
    :root {
        --btn-size: clamp(26px, 5vw, 40px);
    }
}