:root {
    --ink: #f8fafc;
    --muted: #94a3b8;
    --panel: rgba(15, 23, 42, 0.88);
    --panel-border: rgba(148, 163, 184, 0.18);
    --orange: #f97316;
    --orange-light: #fb923c;
    --green: #34d399;
    --yellow: #fbbf24;
    --red: #fb7185;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    background: #050a13;
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background:
        radial-gradient(circle at 50% 0%, rgba(249, 115, 22, 0.12), transparent 35rem),
        #050a13;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

.top-nav {
    height: 3.75rem;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(148, 163, 184, 0.12);
    background: rgba(5, 10, 19, 0.88);
    backdrop-filter: blur(12px);
}

.top-nav a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 650;
}

.top-nav a:hover {
    color: var(--orange-light);
}

.top-nav .brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    color: #fff;
}

.brand img {
    width: 1.2rem;
    height: 1.2rem;
}

.game-shell {
    width: 100%;
    margin: 0 auto;
    padding: 1.25rem;
}

.game-stage {
    position: relative;
    width: min(100%, 42rem, calc((100vh - 7rem) * 0.75));
    height: auto;
    aspect-ratio: 3 / 4;
    margin: 0 auto;
    overflow: hidden;
    border: 1px solid rgba(148, 163, 184, 0.16);
    border-radius: 1.25rem;
    background: #0a1526;
    box-shadow: 0 2rem 6rem rgba(0, 0, 0, 0.38);
    isolation: isolate;
}

#gameCanvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.top-hud {
    position: absolute;
    z-index: 4;
    top: 1.25rem;
    left: 50%;
    transform: translateX(-50%);
    display: grid;
    grid-template-columns: repeat(3, 8.5rem);
    gap: 0.5rem;
}

.stat-card {
    min-height: 3.75rem;
    display: flex;
    flex-direction: column;
    padding: 0.55rem 0.85rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.75rem;
    background: rgba(5, 10, 19, 0.68);
    backdrop-filter: blur(10px);
}

.stat-center {
    align-items: center;
}

.stat-right {
    align-items: flex-end;
}

.stat-label {
    color: #94a3b8;
    font-size: 0.67rem;
    font-weight: 750;
    letter-spacing: 0.09em;
    text-transform: uppercase;
}

.stat-card strong {
    margin-top: 0.05rem;
    color: #fff;
    font-size: 1.15rem;
    font-variant-numeric: tabular-nums;
}

.speedometer {
    position: absolute;
    z-index: 4;
    top: 5.35rem;
    right: 1rem;
    width: 8.5rem;
    padding: 0.5rem 0.65rem 0.55rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.85rem;
    background: rgba(5, 10, 19, 0.74);
    backdrop-filter: blur(10px);
    text-align: center;
}

.speedometer svg {
    width: 100%;
    display: block;
    overflow: visible;
}

.speedometer-track,
.speedometer-zone {
    fill: none;
    stroke-linecap: round;
}

.speedometer-track {
    stroke: #334155;
    stroke-width: 7;
}

.speedometer-zone {
    stroke-width: 7;
}

.speedometer-zone.slow {
    stroke: #fb7185;
}

.speedometer-zone.fast {
    stroke: #34d399;
}

.speed-needle {
    transform: rotate(-90deg);
    transform-origin: 60px 62px;
    transition: transform 140ms ease-out;
}

.speed-needle line {
    stroke: #fff7ed;
    stroke-width: 3;
    stroke-linecap: round;
}

.speedometer circle {
    fill: var(--orange);
}

.speedometer strong {
    display: block;
    margin-top: -0.45rem;
    color: #fff;
    font-size: 1.05rem;
    font-variant-numeric: tabular-nums;
}

.speedometer small {
    color: #94a3b8;
    font-size: 0.56rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.speedometer > span {
    display: block;
    min-height: 0.8rem;
    margin-top: 0.1rem;
    color: #94a3b8;
    font-size: 0.56rem;
    font-weight: 700;
}

.stamina-wrap {
    position: absolute;
    z-index: 4;
    left: 50%;
    bottom: 1.1rem;
    width: min(32rem, calc(100% - 2rem));
    transform: translateX(-50%);
    padding: 0.75rem 0.9rem;
    border: 1px solid var(--panel-border);
    border-radius: 0.8rem;
    background: rgba(5, 10, 19, 0.76);
    backdrop-filter: blur(12px);
}

.stamina-label {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.45rem;
    color: #cbd5e1;
    font-size: 0.7rem;
    font-weight: 750;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

#staminaMessage {
    color: var(--green);
}

.stamina-track {
    height: 0.52rem;
    overflow: hidden;
    border-radius: 999px;
    background: #1e293b;
}

.stamina-bar {
    width: 100%;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #10b981, #6ee7b7);
    box-shadow: 0 0 1rem rgba(52, 211, 153, 0.45);
    transition: width 100ms linear, background 200ms;
}

.stamina-bar.warning {
    background: linear-gradient(90deg, #f59e0b, #fcd34d);
    box-shadow: 0 0 1rem rgba(251, 191, 36, 0.45);
}

.stamina-bar.danger {
    background: linear-gradient(90deg, #e11d48, #fb7185);
    box-shadow: 0 0 1rem rgba(251, 113, 133, 0.5);
}

.camera-card {
    position: absolute;
    z-index: 5;
    top: 5.35rem;
    left: 1rem;
    width: 12rem;
    overflow: hidden;
    border: 1px solid var(--panel-border);
    border-radius: 0.85rem;
    background: rgba(5, 10, 19, 0.82);
    box-shadow: 0 1rem 2rem rgba(0, 0, 0, 0.24);
}

.lane-indicator {
    position: absolute;
    z-index: 5;
    top: 5.55rem;
    left: 50%;
    display: flex;
    gap: 0.3rem;
    transform: translateX(-50%);
    padding: 0.35rem;
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    background: rgba(5, 10, 19, 0.72);
    backdrop-filter: blur(10px);
}

.lane-indicator span {
    width: 1.55rem;
    height: 1.55rem;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: #64748b;
    font-size: 0.57rem;
    font-weight: 850;
    transition: color 120ms, background 120ms, box-shadow 120ms;
}

.lane-indicator span.active {
    color: #fff7ed;
    background: var(--orange);
    box-shadow: 0 0 0.8rem rgba(249, 115, 22, 0.5);
}

.squat-indicator {
    position: absolute;
    z-index: 5;
    top: 7.75rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.3rem 0.55rem;
    border: 1px solid var(--panel-border);
    border-radius: 999px;
    color: #94a3b8;
    background: rgba(5, 10, 19, 0.72);
    font-size: 0.56rem;
    font-weight: 750;
    white-space: nowrap;
    backdrop-filter: blur(8px);
    transition: color 120ms, border-color 120ms, background 120ms;
}

.squat-indicator.active {
    border-color: rgba(52, 211, 153, 0.7);
    color: #ecfdf5;
    background: rgba(5, 150, 105, 0.72);
}

.camera-frame {
    position: relative;
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: #0f172a;
}

#webcam,
#poseCanvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1);
}

#poseCanvas {
    z-index: 1;
}

.camera-status {
    position: absolute;
    z-index: 2;
    inset: 0;
    display: grid;
    place-items: center;
    color: #64748b;
    font-size: 0.75rem;
    font-weight: 650;
    background: #0f172a;
}

.camera-status.hidden {
    display: none;
}

.camera-readout {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 2rem;
    padding: 0.45rem 0.65rem;
    color: #cbd5e1;
    font-size: 0.67rem;
    font-weight: 650;
}

.status-dot {
    width: 0.45rem;
    height: 0.45rem;
    flex: 0 0 auto;
    border-radius: 50%;
    background: #64748b;
}

.status-dot.active {
    background: var(--green);
    box-shadow: 0 0 0.6rem var(--green);
}

.status-dot.warning {
    background: var(--yellow);
    box-shadow: 0 0 0.5rem var(--yellow);
}

.movement-cue {
    position: absolute;
    z-index: 4;
    top: 28%;
    left: 50%;
    opacity: 0;
    transform: translate(-50%, 0.75rem) scale(0.96);
    padding: 0.55rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.16);
    border-radius: 999px;
    color: #fff;
    background: rgba(5, 10, 19, 0.74);
    font-size: 0.82rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    pointer-events: none;
    transition: opacity 150ms, transform 150ms;
    backdrop-filter: blur(8px);
}

.movement-cue.visible {
    opacity: 1;
    transform: translate(-50%, 0) scale(1);
}

.overlay {
    position: absolute;
    z-index: 10;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 1.5rem;
    opacity: 0;
    visibility: hidden;
    background: rgba(2, 6, 23, 0.7);
    backdrop-filter: blur(12px);
    transition: opacity 220ms, visibility 220ms;
}

.overlay.visible {
    opacity: 1;
    visibility: visible;
}

.modal {
    width: min(100%, 39rem);
    max-height: 100%;
    overflow-y: auto;
    padding: 2rem;
    border: 1px solid rgba(148, 163, 184, 0.2);
    border-radius: 1.25rem;
    background:
        linear-gradient(145deg, rgba(30, 41, 59, 0.96), rgba(8, 17, 31, 0.98));
    box-shadow: 0 2rem 5rem rgba(0, 0, 0, 0.45);
    text-align: center;
}

.eyebrow {
    color: var(--orange-light);
    font-size: 0.7rem;
    font-weight: 800;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}

.modal h1,
.modal h2 {
    margin: 0.35rem 0 0.75rem;
    color: #fff;
    letter-spacing: -0.035em;
}

.modal h1 {
    font-size: clamp(2.15rem, 6vw, 3.5rem);
}

.modal h2 {
    font-size: 2rem;
}

.lede {
    max-width: 34rem;
    margin: 0 auto 1.35rem;
    color: #cbd5e1;
    font-size: 0.95rem;
    line-height: 1.55;
}

.move-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.65rem;
    margin-bottom: 1rem;
}

.move-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 0;
    padding: 0.9rem 0.55rem;
    border: 1px solid rgba(148, 163, 184, 0.14);
    border-radius: 0.75rem;
    background: rgba(15, 23, 42, 0.72);
}

.move-card strong {
    margin: 0.3rem 0 0.18rem;
    color: #f8fafc;
    font-size: 0.75rem;
}

.move-card span:last-child {
    color: #94a3b8;
    font-size: 0.67rem;
    line-height: 1.35;
}

.move-icon {
    min-height: 1.65rem;
    color: var(--orange-light);
    font-size: 1.5rem;
    font-weight: 850;
    line-height: 1;
}

.feet-icon {
    letter-spacing: 0.2rem;
}

.squat-icon {
    transform: translateY(-1px);
}

.setup-note {
    display: flex;
    gap: 0.75rem;
    padding: 0.8rem 0.9rem;
    border: 1px solid rgba(251, 191, 36, 0.16);
    border-radius: 0.7rem;
    background: rgba(120, 53, 15, 0.16);
    text-align: left;
}

.setup-note strong {
    flex: 0 0 auto;
    color: #fde68a;
    font-size: 0.72rem;
}

.setup-note span {
    color: #d6d3d1;
    font-size: 0.68rem;
    line-height: 1.4;
}

.model-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.55rem;
    min-height: 1.5rem;
    margin: 0.85rem 0 0.55rem;
    color: #94a3b8;
    font-size: 0.72rem;
}

.model-status.ready {
    color: var(--green);
}

.model-status.error {
    color: var(--red);
}

.spinner {
    width: 0.85rem;
    height: 0.85rem;
    border: 2px solid #334155;
    border-top-color: var(--orange);
    border-radius: 50%;
    animation: spin 700ms linear infinite;
}

.ready .spinner,
.error .spinner {
    display: none;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.primary-button {
    width: min(100%, 20rem);
    min-height: 3rem;
    border: 0;
    border-radius: 0.7rem;
    color: #fff;
    background: linear-gradient(135deg, var(--orange), #ea580c);
    box-shadow: 0 0.8rem 2rem rgba(234, 88, 12, 0.24);
    font: inherit;
    font-size: 0.9rem;
    font-weight: 800;
    cursor: pointer;
    transition: transform 120ms, filter 120ms;
}

.primary-button:hover:not(:disabled) {
    filter: brightness(1.08);
    transform: translateY(-1px);
}

.primary-button:disabled {
    cursor: wait;
    filter: grayscale(0.5);
    opacity: 0.55;
}

.privacy-note {
    margin: 0.6rem 0 0;
    color: #64748b;
    font-size: 0.65rem;
}

.calibration-modal {
    width: min(100%, 38rem);
}

.countdown {
    width: 5rem;
    height: 5rem;
    display: grid;
    place-items: center;
    margin: 0 auto 1rem;
    border: 2px solid var(--orange);
    border-radius: 50%;
    color: #fff;
    background: rgba(249, 115, 22, 0.12);
    font-size: 2.25rem;
    font-weight: 850;
    box-shadow: 0 0 2rem rgba(249, 115, 22, 0.18);
}

.calibration-modal p,
.error-modal p,
.game-over-modal p {
    color: #94a3b8;
    font-size: 0.85rem;
    line-height: 1.5;
}

.calibration-preview {
    position: relative;
    width: 100%;
    margin-top: 1rem;
    overflow: hidden;
    aspect-ratio: 16 / 9;
    border: 1px solid rgba(148, 163, 184, 0.24);
    border-radius: 0.8rem;
    background: #020617;
}

#calibrationCanvas {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.position-guide {
    position: absolute;
    top: 7%;
    bottom: 5%;
    left: 50%;
    width: 38%;
    transform: translateX(-50%);
    border: 2px dashed rgba(251, 146, 60, 0.8);
    border-radius: 45% 45% 20% 20% / 18% 18% 10% 10%;
    box-shadow: inset 0 0 2rem rgba(249, 115, 22, 0.06);
    pointer-events: none;
}

.position-guide::after {
    content: "";
    position: absolute;
    top: 48%;
    left: -12%;
    width: 124%;
    border-top: 1px dashed rgba(255, 255, 255, 0.35);
}

.position-guide span {
    position: absolute;
    bottom: 0.35rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.2rem 0.45rem;
    border-radius: 999px;
    color: #ffedd5;
    background: rgba(67, 20, 7, 0.8);
    font-size: 0.55rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    white-space: nowrap;
}

.calibration-progress {
    height: 0.35rem;
    margin-top: 1.2rem;
    overflow: hidden;
    border-radius: 999px;
    background: #334155;
}

#calibrationBar {
    width: 0;
    height: 100%;
    border-radius: inherit;
    background: var(--orange);
}

.final-distance {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
    margin: 0.8rem 0;
}

.final-distance strong {
    color: #fff;
    font-size: 4rem;
    letter-spacing: -0.06em;
}

.final-distance span {
    color: #94a3b8;
    font-size: 0.9rem;
    font-weight: 700;
}

.text-button {
    display: block;
    margin: 0.85rem auto 0;
    border: 0;
    color: #94a3b8;
    background: none;
    font: inherit;
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
}

.text-button:hover {
    color: #fff;
}

.error-icon {
    width: 3.5rem;
    height: 3.5rem;
    display: grid;
    place-items: center;
    margin: 0 auto 0.75rem;
    border-radius: 50%;
    color: #fecdd3;
    background: rgba(225, 29, 72, 0.2);
    font-size: 1.5rem;
    font-weight: 850;
}

.instructions {
    width: min(100%, 62rem);
    margin: 0 auto;
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 3rem;
    align-items: start;
    padding: 3.5rem 1.5rem 4rem;
}

.instructions h2 {
    max-width: 28rem;
    margin: 0.4rem 0 0;
    color: #f8fafc;
    font-size: clamp(1.8rem, 3vw, 2.5rem);
    letter-spacing: -0.035em;
}

.instructions p {
    max-width: 42rem;
    margin: 0;
    color: #94a3b8;
    font-size: 0.95rem;
    line-height: 1.75;
}

@media (max-width: 780px) {
    .top-nav {
        height: 3.25rem;
        padding: 0 1rem;
    }

    .game-shell {
        padding: 0;
    }

    .game-stage {
        width: 100%;
        height: calc(100svh - 3.25rem);
        min-height: 36rem;
        aspect-ratio: auto;
        border: 0;
        border-radius: 0;
    }

    .top-hud {
        top: 0.65rem;
        grid-template-columns: repeat(3, minmax(5.5rem, 1fr));
        width: calc(100% - 1rem);
    }

    .stat-card {
        min-height: 3.25rem;
        padding: 0.45rem 0.6rem;
    }

    .camera-card {
        top: 4.35rem;
        left: 0.6rem;
        width: 6.4rem;
    }

    .speedometer {
        top: 4.35rem;
        right: 0.6rem;
        width: 6.8rem;
        padding: 0.35rem 0.45rem 0.4rem;
    }

    .speedometer > span {
        display: none;
    }

    .lane-indicator {
        top: 4.55rem;
        padding: 0.25rem;
        gap: 0.18rem;
    }

    .lane-indicator span {
        width: 1.35rem;
        height: 1.35rem;
    }

    .squat-indicator {
        top: 6.65rem;
        max-width: 11rem;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .camera-readout {
        display: none;
    }

    .stamina-wrap {
        bottom: 0.6rem;
    }

    .modal {
        padding: 1.35rem;
    }

    .move-grid {
        gap: 0.35rem;
    }

    .move-card {
        padding: 0.7rem 0.3rem;
    }

    .setup-note {
        display: block;
    }

    .setup-note strong {
        display: block;
        margin-bottom: 0.2rem;
    }

    .instructions {
        grid-template-columns: 1fr;
        gap: 1.25rem;
        padding: 3rem 1.5rem;
    }
}

@media (min-width: 781px) and (max-height: 760px) {
    .game-stage {
        width: min(100%, calc((100vh - 5.5rem) * 0.75));
    }
}

@media (max-height: 720px) and (min-width: 781px) {
    .intro-modal {
        padding: 1.3rem 1.75rem;
    }

    .modal h1 {
        font-size: 2.4rem;
    }

    .lede {
        margin-bottom: 0.8rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}