/* ==========================================================================
   练了么 — operator console shared chrome (/coach and /certification)

   One dark stage for the camera, light instrument panels around it. The stage
   is where the athlete looks; the rails are where the operator looks.
   ========================================================================== */

body {
    background: var(--bg);
    background-image: radial-gradient(900px 420px at 82% -12%, rgba(47, 107, 255, 0.06), transparent 62%),
        radial-gradient(760px 380px at 4% 4%, rgba(31, 198, 137, 0.05), transparent 66%);
    background-attachment: fixed;
    min-height: 100vh;
}

/* --------------------------------------------------------------------------
   Top bar
   -------------------------------------------------------------------------- */
.topbar {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(248, 250, 252, 0.82);
    -webkit-backdrop-filter: saturate(180%) blur(16px);
    backdrop-filter: saturate(180%) blur(16px);
    border-bottom: 1px solid var(--line);
}

.topbar-inner {
    display: flex;
    align-items: center;
    gap: 14px;
    height: 58px;
    max-width: var(--shell-wide);
    margin-inline: auto;
    padding-inline: clamp(14px, 2.4vw, 26px);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 32px;
    padding: 0 11px 0 8px;
    border-radius: var(--r-sm);
    font-size: 13px;
    font-weight: 560;
    color: var(--text-2);
    transition: background var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
    flex: none;
}

.back-link:hover {
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--sh-xs);
}

.topbar-title {
    display: flex;
    align-items: baseline;
    gap: 10px;
    min-width: 0;
}

.topbar-title h1 {
    font-size: 15.5px;
    font-weight: 660;
    letter-spacing: -0.024em;
    white-space: nowrap;
}

.topbar-title span {
    font-size: 12.5px;
    color: var(--text-3);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topbar-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    flex: none;
}

.topbar-divider {
    width: 1px;
    height: 22px;
    background: var(--line-strong);
    flex: none;
}

/* --------------------------------------------------------------------------
   Pills — the runtime toggles these classes, so keep the contract:
   .pill / .pill.good / .pill.warn / .pill.alert
   -------------------------------------------------------------------------- */
.pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 27px;
    padding: 0 11px;
    border-radius: var(--r-full);
    background: var(--surface);
    border: 1px solid var(--line-strong);
    color: var(--text-2);
    font-size: 12px;
    font-weight: 570;
    letter-spacing: -0.004em;
    white-space: nowrap;
    box-shadow: var(--sh-xs);
    transition: background var(--t) var(--ease), border-color var(--t) var(--ease),
        color var(--t) var(--ease);
}

.pill.good {
    background: var(--g-50);
    border-color: var(--g-200);
    color: var(--g-700);
}

.pill.warn {
    background: var(--w-50);
    border-color: var(--w-100);
    color: var(--w-700);
}

.pill.alert {
    background: var(--r-50);
    border-color: var(--r-100);
    color: var(--r-700);
}

.pill.mono {
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0;
}

/* On the dark stage the same pills become glass. */
.stage-overlay .pill,
.video-overlay .pill {
    background: rgba(10, 18, 30, 0.6);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-color: rgba(148, 174, 214, 0.22);
    color: var(--stage-text);
    box-shadow: none;
    height: 28px;
}

.stage-overlay .pill.good,
.video-overlay .pill.good {
    background: rgba(6, 52, 38, 0.68);
    border-color: rgba(31, 198, 137, 0.42);
    color: #8df0c6;
}

.stage-overlay .pill.warn,
.video-overlay .pill.warn {
    background: rgba(64, 41, 4, 0.7);
    border-color: rgba(251, 199, 90, 0.42);
    color: #fcd894;
}

.stage-overlay .pill.alert,
.video-overlay .pill.alert {
    background: rgba(74, 20, 12, 0.72);
    border-color: rgba(255, 157, 146, 0.44);
    color: #ffb9b0;
}

/* --------------------------------------------------------------------------
   Dark camera stage
   -------------------------------------------------------------------------- */
.video-stage,
.video-box {
    position: relative;
    overflow: hidden;
    border-radius: var(--r-2xl);
    background: radial-gradient(90% 80% at 50% 22%, #16273c 0%, #0c1725 58%, #070d17 100%);
    border: 1px solid rgba(148, 174, 214, 0.16);
    box-shadow: 0 2px 6px rgba(9, 18, 33, 0.18), 0 32px 68px -26px rgba(9, 18, 33, 0.5),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
    isolation: isolate;
    transition: box-shadow var(--t-slow) var(--ease), border-color var(--t-slow) var(--ease);
}

/* Tone ring driven by the live status badge — peripheral feedback the athlete
   can read without looking away from their own body. */
.video-stage[data-tone="good"],
.video-box[data-tone="good"] {
    border-color: rgba(31, 198, 137, 0.5);
    box-shadow: 0 0 0 1px rgba(31, 198, 137, 0.18), 0 0 44px -6px rgba(31, 198, 137, 0.32),
        0 32px 68px -26px rgba(9, 18, 33, 0.5);
}

.video-stage[data-tone="warn"],
.video-box[data-tone="warn"] {
    border-color: rgba(251, 199, 90, 0.5);
    box-shadow: 0 0 0 1px rgba(251, 199, 90, 0.18), 0 0 44px -6px rgba(251, 199, 90, 0.34),
        0 32px 68px -26px rgba(9, 18, 33, 0.5);
}

.video-stage[data-tone="alert"],
.video-box[data-tone="alert"] {
    border-color: rgba(255, 122, 106, 0.56);
    box-shadow: 0 0 0 1px rgba(255, 122, 106, 0.2), 0 0 46px -4px rgba(240, 80, 63, 0.4),
        0 32px 68px -26px rgba(9, 18, 33, 0.5);
}

.video-stage video,
.video-box video {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    background: transparent;
}

/* Standby art: a calm brief instead of a black rectangle before the camera
   opens. Hidden as soon as the video element has a stream. */
.stage-standby {
    position: absolute;
    inset: 0;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    text-align: center;
    padding: 24px;
    color: var(--stage-text-2);
    transition: opacity var(--t-slow) var(--ease);
}

.video-stage.is-live .stage-standby,
.video-box.is-live .stage-standby {
    opacity: 0;
    pointer-events: none;
}

.stage-standby-mark {
    width: 54px;
    height: 54px;
    border-radius: 16px;
    display: grid;
    place-items: center;
    background: rgba(148, 174, 214, 0.08);
    border: 1px solid rgba(148, 174, 214, 0.18);
    color: rgba(215, 227, 245, 0.8);
}

.stage-standby b {
    font-size: 15px;
    font-weight: 620;
    color: var(--stage-text);
    letter-spacing: -0.018em;
}

.stage-standby span {
    font-size: 13px;
    max-width: 30ch;
    line-height: 1.6;
}

/* HUD layers. ghost-coach.css pins these above the overlay canvas at z-index 2. */
.stage-overlay,
.video-overlay {
    position: absolute;
    inset: 0;
    padding: clamp(12px, 1.6vw, 18px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    gap: 12px;
    pointer-events: none;
}

.overlay-top,
.overlay-bottom {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}

.overlay-bottom {
    align-items: flex-end;
}

.overlay-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    min-width: 0;
}

.overlay-card {
    padding: 11px 14px;
    border-radius: var(--r-lg);
    background: rgba(9, 17, 28, 0.62);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    backdrop-filter: blur(14px) saturate(160%);
    border: 1px solid rgba(148, 174, 214, 0.18);
    color: var(--stage-text);
    min-width: 0;
}

.overlay-label {
    display: block;
    font-size: 10px;
    font-weight: 640;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(215, 227, 245, 0.6);
    margin-bottom: 2px;
}

.overlay-value {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.016em;
    line-height: 1.42;
}

.overlay-sub {
    margin-top: 3px;
    font-size: 12.5px;
    line-height: 1.5;
    color: rgba(215, 227, 245, 0.6);
}

/* The rep readout — the one number that has to be readable across a room. */
.overlay-count {
    text-align: right;
    padding: 10px 16px 12px;
    min-width: 104px;
}

.overlay-count .overlay-value {
    font-size: clamp(34px, 4vw, 46px);
    font-weight: 700;
    letter-spacing: -0.045em;
    line-height: 1.02;
    font-variant-numeric: tabular-nums;
    color: #fff;
}

.overlay-count.bump .overlay-value {
    animation: rep-bump 420ms var(--spring);
}

@keyframes rep-bump {
    0% {
        transform: translateY(5px) scale(0.9);
        opacity: 0.45;
    }
    100% {
        transform: none;
        opacity: 1;
    }
}

.cue-card {
    flex: 1 1 auto;
    max-width: 62%;
}

/* --------------------------------------------------------------------------
   Phase track — where the athlete is inside the movement
   -------------------------------------------------------------------------- */
.phase-track {
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: 9px;
}

.phase-track i {
    flex: 1 1 0;
    height: 3px;
    border-radius: 3px;
    background: rgba(148, 174, 214, 0.22);
    font-style: normal;
    transition: background var(--t) var(--ease), box-shadow var(--t) var(--ease);
}

.phase-track i.on {
    background: var(--g-400);
    box-shadow: 0 0 10px rgba(31, 198, 137, 0.7);
}

/* --------------------------------------------------------------------------
   Rails / instrument panels
   -------------------------------------------------------------------------- */
.rail {
    display: flex;
    flex-direction: column;
    gap: 14px;
    min-width: 0;
}

.rail-section {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-xl);
    box-shadow: var(--sh-sm);
    padding: 18px;
}

.section-heading {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 0 14px;
    font-size: 12px;
    font-weight: 660;
    letter-spacing: 0.075em;
    text-transform: uppercase;
    color: var(--text-3);
}

.section-heading::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--line);
}

.field-label {
    display: block;
    margin: 0 0 7px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-2);
}

.field-label + .select,
.field-label + .input {
    margin-bottom: 14px;
}

.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 4px;
}

.button-grid .span-2 {
    grid-column: span 2;
}

.status-copy {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--line);
    font-size: 12.5px;
    line-height: 1.6;
    color: var(--text-3);
}

/* Metrics */
.metrics-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1px;
    background: var(--line);
    border: 1px solid var(--line);
    border-radius: var(--r-lg);
    overflow: hidden;
}

.metric {
    background: var(--surface);
    padding: 13px 14px 14px;
}

.metric .metric-value {
    margin-top: 3px;
    font-size: 22px;
}

.metric:first-child .metric-value {
    color: var(--g-600);
}

/* Live cue block */
.feedback-main {
    font-size: 15.5px;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.5;
    color: var(--text);
}

.feedback-sub {
    margin-top: 6px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--text-3);
}

.cue-log {
    display: flex;
    flex-direction: column;
    gap: 1px;
    margin-top: 14px;
    border-top: 1px solid var(--line);
    padding-top: 12px;
    max-height: 208px;
    overflow-y: auto;
}

.cue-log:empty {
    display: none;
}

.cue-log li {
    display: flex;
    gap: 9px;
    align-items: flex-start;
    padding: 7px 9px;
    border-radius: var(--r-sm);
    font-size: 12.5px;
    line-height: 1.5;
    color: var(--text-2);
    background: var(--surface-2);
    animation: cue-in 320ms var(--ease-out);
}

.cue-log li::before {
    content: "";
    width: 5px;
    height: 5px;
    margin-top: 7px;
    border-radius: 50%;
    background: var(--w-300);
    flex: none;
}

.cue-log li:first-child {
    background: var(--w-50);
    color: var(--w-700);
}

@keyframes cue-in {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }
    to {
        opacity: 1;
        transform: none;
    }
}

/* Summary */
.summary-panel {
    border-color: var(--g-200);
    background: linear-gradient(168deg, var(--g-50), var(--surface) 58%);
}

.summary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 14px;
}

.summary-item {
    padding: 12px 14px;
    border-radius: var(--r-md);
    background: var(--surface);
    border: 1px solid var(--line);
}

.summary-item .metric-value {
    margin-top: 3px;
    font-size: 22px;
}

.summary-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 14px;
}

.summary-list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 9px 12px;
    border-radius: var(--r-sm);
    background: var(--surface);
    border: 1px solid var(--line);
    font-size: 13px;
    color: var(--text-2);
}

.summary-list li strong {
    font-size: 12px;
    font-weight: 640;
    color: var(--r-600);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.error-banner {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px 14px;
    border-radius: var(--r-lg);
    border: 1px solid var(--r-100);
    background: var(--r-50);
    color: var(--r-700);
    font-size: 13.5px;
    line-height: 1.55;
}

/* --------------------------------------------------------------------------
   Narrow screens: the top bar sheds context, never identity or state
   -------------------------------------------------------------------------- */
@media (max-width: 760px) {
    .topbar-inner {
        gap: 10px;
    }

    .topbar-title span,
    .topbar-meta .pill.mono {
        display: none;
    }

    .topbar-meta {
        min-width: 0;
    }
}

/* --------------------------------------------------------------------------
   Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .overlay-count.bump .overlay-value,
    .cue-log li {
        animation: none;
    }
}