:root {
    --bg: #0b1020;
    --bg-grad-1: #14203f;
    --bg-grad-2: #0b1020;
    --panel: #121a30;
    --panel-2: #0e1525;
    --border: #233152;
    --text: #e6ebf5;
    --muted: #8b97b3;
    --accent: #5b8cff;
    --accent-2: #36d6a0;
    --local: #5b8cff;
    --remote: #36d6a0;
    --radius: 14px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

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

html,
body {
    height: 100%;
}

body {
    font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica,
        Arial, sans-serif;
    color: var(--text);
    background:
        radial-gradient(1200px 600px at 80% -10%, var(--bg-grad-1), transparent 60%),
        radial-gradient(900px 500px at -10% 110%, #1a2b22, transparent 55%),
        var(--bg);
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 18px;
    gap: 16px;
}

/* Top bar */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 6px 4px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    letter-spacing: 0.2px;
}

.brand .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-2);
    box-shadow: 0 0 0 4px rgba(54, 214, 160, 0.18);
}

.brand strong {
    font-weight: 700;
}

.brand-sub {
    color: var(--muted);
    font-size: 13px;
    padding-left: 8px;
    border-left: 1px solid var(--border);
}

.start-btn {
    appearance: none;
    border: none;
    cursor: pointer;
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    padding: 11px 18px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), #7aa2ff);
    box-shadow: 0 8px 20px rgba(91, 140, 255, 0.35);
    transition: transform 0.12s ease, box-shadow 0.12s ease, opacity 0.12s ease;
}

.start-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 12px 26px rgba(91, 140, 255, 0.45);
}

.start-btn:active:not(:disabled) {
    transform: translateY(0);
}

.start-btn:disabled {
    cursor: default;
    background: linear-gradient(135deg, #2a6b54, var(--accent-2));
    box-shadow: 0 8px 20px rgba(54, 214, 160, 0.3);
}

/* Stage */
.stage {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    min-height: 0;
}

.panel {
    background: linear-gradient(180deg, var(--panel), var(--panel-2));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel-head {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--border);
}

.tag {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 4px 9px;
    border-radius: 999px;
}

.tag-local {
    color: var(--local);
    background: rgba(91, 140, 255, 0.14);
    border: 1px solid rgba(91, 140, 255, 0.35);
}

.tag-remote {
    color: var(--remote);
    background: rgba(54, 214, 160, 0.14);
    border: 1px solid rgba(54, 214, 160, 0.35);
}

.panel-hint {
    color: var(--muted);
    font-size: 12px;
}

.video-wrap {
    position: relative;
    flex: 1;
    min-height: 240px;
    background:
        repeating-linear-gradient(
            45deg,
            rgba(255, 255, 255, 0.015) 0,
            rgba(255, 255, 255, 0.015) 12px,
            transparent 12px,
            transparent 24px
        ),
        #05080f;
}

.video-wrap video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: transparent;
}

.video-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: var(--muted);
    font-size: 13px;
    pointer-events: none;
}

.video-placeholder .play,
.video-placeholder .wave {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    font-size: 22px;
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border);
}

.video-placeholder .wave {
    animation: pulse 1.8s ease-in-out infinite;
}

@keyframes pulse {
    0%,
    100% {
        opacity: 0.5;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.06);
    }
}

/* Controls */
.controls {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 12px;
    padding: 14px 16px;
    border-top: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.015);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.field-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--muted);
}

.field input,
.select select {
    width: 100%;
    color: var(--text);
    background: #0c1322;
    border: 1px solid var(--border);
    border-radius: 9px;
    padding: 9px 11px;
    font-size: 13px;
    outline: none;
    transition: border-color 0.12s ease, box-shadow 0.12s ease;
}

.field input:focus,
.select select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(91, 140, 255, 0.18);
}

.field input::placeholder {
    color: #57658a;
}

.select {
    position: relative;
}

.select::after {
    content: "▾";
    position: absolute;
    right: 11px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--muted);
    pointer-events: none;
    font-size: 12px;
}

.select select {
    appearance: none;
    cursor: pointer;
    padding-right: 28px;
}

.select select option {
    background: #0c1322;
    color: var(--text);
}

/* Foot bar */
.footbar {
    text-align: center;
    color: var(--muted);
    font-size: 12px;
    padding: 2px 0 4px;
}

.footbar code {
    color: var(--text);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1px 6px;
    font-size: 11px;
}

/* Responsive */
@media (max-width: 820px) {
    .stage {
        grid-template-columns: 1fr;
    }
    .topbar {
        flex-direction: column;
        align-items: stretch;
    }
    .start-btn {
        width: 100%;
    }
}