/* ── Design tokens ── */
:root {
    --color-bg: #020205;
    --color-cyan: #22d3ee;
    --color-cyan-dim: #06b6d4;
    --color-cyan-muted: rgba(6, 182, 212, 0.2);
    --color-red: #ef4444;
    --color-green: #4ade80;
    --color-yellow: #facc15;
    --font-body: 'Space Grotesk', sans-serif;
    --font-hud: 'Orbitron', sans-serif;
    --z-canvas: 1;
    --z-hud: 20;
    --z-home: 25;
    --z-overlay: 30;
    --z-block: 40;

    /* Responsive scale (defaults = tablet landscape / small desktop) */
    --space-hud: 1.25rem;
    --home-btn-size: 2.65rem;
    --home-offset: 1.25rem;
    --hud-stats-offset: 3.35rem;
    --stat-value-lg: 1.35rem;
    --stat-value-md: 0.9375rem;
    --overlay-pad: clamp(0.75rem, min(2.5vw, 2.5vh), 2rem);
    --overlay-card-pad: clamp(1.15rem, min(3.5vw, 3.2vh), 2.5rem);
    --overlay-card-max-w: min(32rem, calc(100vw - var(--overlay-pad) * 2));
    --title-main-size: clamp(1.5rem, min(6vw, 5.5vh), 2.5rem);
    --briefing-title-size: clamp(1.1rem, min(4vw, 4vh), 1.5rem);
    --emblem-size: clamp(3rem, min(12vw, 11vh), 5rem);
    --logo-width: clamp(13rem, 78vw, 28rem);
    --logo-max-height: clamp(4rem, 22vh, 8rem);
    --start-card-max-w: min(30rem, calc(100vw - var(--overlay-pad) * 2));
    --start-card-pad: clamp(1.5rem, min(4vw, 3.8vh), 3rem);
    --start-gap: clamp(0.4rem, min(2vw, 1.8vh), 0.85rem);
    --overlay-desc-size: clamp(0.75rem, min(2.2vw, 2vh), 0.875rem);
    --controls-gap: clamp(0.35rem, min(1vw, 1vh), 0.5rem);
    --controls-item-pad-y: clamp(0.35rem, min(1.2vw, 1.2vh), 0.5rem);
    --controls-item-pad-x: clamp(0.4rem, min(1.4vw, 1.4vh), 0.6rem);
    --controls-key-size: clamp(7px, min(1.6vw, 1.6vh), 8px);
    --controls-val-size: clamp(9px, min(2vw, 2vh), 10px);
    --threat-bar-width: 6rem;
    --steady-track-height: 10rem;
    --controls-cols: 3;
    --briefing-intel-cols: 4;

    /* HUD element scale */
    --stat-label-size: 9px;
    --stat-panel-pad-y: 0.5rem;
    --stat-panel-pad-x: 1rem;
    --stat-panel-radius: 0.75rem;
    --hud-stats-gap: 0.75rem;
    --hud-accent-border: 4px;
    --threat-bar-height: 0.5rem;
    --threat-label-size: 0.75rem;
    --threat-gauge-gap: 0.75rem;
    --ammo-count-size: 1.5rem;
    --ammo-panel-pad-y: 0.75rem;
    --ammo-panel-pad-x: 1.25rem;
    --ammo-panel-gap: 1.25rem;
    --ammo-label-size: 9px;
    --ammo-divider-height: 2rem;
    --alert-text-size: 0.75rem;
    --steady-gauge-left: 1.5rem;
    --steady-label-size: 9px;
    --steady-track-width: 0.5rem;
    --tactical-briefing-size: 10px;
}

/* ── Reset & base ── */
*, *::before, *::after { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--color-bg);
    color: #fff;
    font-family: var(--font-body);
    touch-action: none;
    user-select: none;
}

canvas {
    display: block;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: var(--z-canvas);
}

.hidden { display: none !important; }

.hud-font { font-family: var(--font-hud); }

/* ── Glass panel ── */
.glass-panel {
    background: rgba(4, 4, 12, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(0, 255, 200, 0.15);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.pop-up { animation: popUp 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275); }

@keyframes popUp {
    0%   { transform: scale(0.8); opacity: 0; }
    100% { transform: scale(1);   opacity: 1; }
}

@keyframes spin-slow {
    from { transform: rotate(0deg); }
    to   { transform: rotate(360deg); }
}

@keyframes ping {
    0%   { transform: scale(1);   opacity: 0.6; }
    75%  { transform: scale(1.6); opacity: 0; }
    100% { transform: scale(1.6); opacity: 0; }
}

/* ── HUD layer ── */
.hud-layer {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: var(--space-hud);
    pointer-events: none;
    z-index: var(--z-hud);
}

.hud-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    width: 100%;
}

.hud-stats {
    display: flex;
    gap: var(--hud-stats-gap);
}

.stat-panel {
    padding: var(--stat-panel-pad-y) var(--stat-panel-pad-x);
    border-radius: var(--stat-panel-radius);
    display: flex;
    flex-direction: column;
}

.stat-panel--accent-left  { border-left:  var(--hud-accent-border) solid var(--color-cyan-dim); }
.stat-panel--accent-right { border-right: var(--hud-accent-border) solid var(--color-red); }

.stat-label {
    font-size: var(--stat-label-size);
    color: var(--color-cyan-dim);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.stat-label--red { color: var(--color-red); }

.stat-value {
    font-weight: 900;
    color: #fff;
    line-height: 1.2;
}

.stat-value--lg  { font-size: var(--stat-value-lg); }
.stat-value--md  { font-size: var(--stat-value-md); font-weight: 700; }
.stat-value--cyan { color: #cffafe; }
.stat-value--cyan2 { color: #a5f3fc; }
.stat-value--red  { color: #f87171; }

.stat-panel--md-only { display: none; }
.stat-panel--lg-only { display: none; }

/* ── Threat gauge ── */
.threat-gauge {
    display: flex;
    align-items: center;
    gap: var(--threat-gauge-gap);
}

.threat-info { text-align: right; }

.threat-bar-track {
    position: relative;
    width: var(--threat-bar-width);
    height: var(--threat-bar-height);
    background: rgba(255, 255, 255, 0.1);
    border-radius: 9999px;
    overflow: hidden;
}

.threat-bar {
    position: absolute;
    inset: 0 auto 0 0;
    width: calc(var(--gauge-fill, 0) * 1%);
    height: 100%;
    background: linear-gradient(to right, var(--color-yellow), var(--color-red));
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.8);
}

.threat-label {
    font-size: var(--threat-label-size);
    font-weight: 900;
    letter-spacing: 0.05em;
}

.threat-label--patrol   { color: var(--color-green); }
.threat-label--engage   { color: var(--color-yellow); }
.threat-label--critical { color: var(--color-red); }

/* ── System alert ── */
.system-alert {
    position: absolute;
    left: 50%;
    top: 25%;
    transform: translate(-50%, -50%) scale(0.9);
    text-align: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.system-alert.is-visible {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.alert-text {
    background: rgba(69, 10, 10, 0.9);
    border: 1px solid var(--color-red);
    padding: 0.5rem 1.5rem;
    border-radius: 0.5rem;
    color: #fecaca;
    font-weight: 900;
    letter-spacing: 0.1em;
    font-size: var(--alert-text-size);
    text-transform: uppercase;
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.4);
}

/* ── Steady breath gauge ── */
.steady-gauge {
    position: absolute;
    left: var(--steady-gauge-left);
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.steady-label {
    font-size: var(--steady-label-size);
    color: var(--color-cyan-dim);
    font-weight: 900;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transform: rotate(90deg);
    transform-origin: left center;
    translate: 0.625rem 2.5rem;
    opacity: 0.7;
}

.steady-track {
    width: var(--steady-track-width);
    height: var(--steady-track-height);
    background: rgba(0, 0, 0, 0.5);
    border-radius: 9999px;
    overflow: hidden;
    border: 1px solid rgba(6, 182, 212, 0.3);
    box-shadow: 0 0 10px var(--color-cyan-muted);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
}

.steady-fill {
    width: 100%;
    height: calc(var(--gauge-fill, 100) * 1%);
    background: var(--color-cyan);
    transition: height 0.1s ease;
    box-shadow: 0 0 10px var(--color-cyan);
}

/* ── Bottom HUD bar ── */
.hud-bottom {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    width: 100%;
}

.tactical-briefing {
    padding: 1rem;
    border-radius: 0.75rem;
    max-width: 20rem;
    font-size: var(--tactical-briefing-size);
    color: rgba(207, 250, 254, 0.8);
    border-color: rgba(6, 182, 212, 0.2);
    display: none;
}

.tactical-briefing__title {
    font-weight: 700;
    color: var(--color-cyan-dim);
    margin-bottom: 0.5rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.tactical-briefing__row + .tactical-briefing__row { margin-top: 0.25rem; }

.tactical-briefing__key { color: #fff; font-weight: 700; }

/* ── Ammo tracker ── */
.ammo-panel {
    padding: var(--ammo-panel-pad-y) var(--ammo-panel-pad-x);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    gap: var(--ammo-panel-gap);
    pointer-events: auto;
}

.ammo-meta { display: flex; flex-direction: column; }

.ammo-label {
    font-size: var(--ammo-label-size);
    color: #06b6d4;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    line-height: 1;
    margin-bottom: 0.375rem;
}

.ammo-reload {
    font-size: var(--ammo-label-size);
    color: #6b7280;
    font-weight: 700;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.ammo-divider {
    height: var(--ammo-divider-height);
    width: 1px;
    background: rgba(255, 255, 255, 0.2);
}

.ammo-count {
    font-size: var(--ammo-count-size);
    font-weight: 900;
    color: #fff;
    line-height: 1;
}

/* ── Overlay screens ── */
.overlay-screen {
    position: absolute;
    inset: 0;
    z-index: var(--z-overlay);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--overlay-pad);
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

.overlay-screen--block {
    z-index: var(--z-block);
    background: linear-gradient(165deg, #010103 0%, #0a0a18 50%, #010103 100%);
}

.overlay-screen--start {
    background: linear-gradient(to bottom, #010103, #050510, #010103);
}

.overlay-screen--end {
    background: rgba(0, 0, 0, 0.95);
}

.overlay-card {
    padding: var(--overlay-card-pad);
    max-width: var(--overlay-card-max-w);
    width: 100%;
    max-height: min(96vh, 96dvh);
    border-radius: 1rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-shrink: 0;
    margin-block: auto;
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.overlay-card--block {
    max-width: min(28rem, calc(100vw - var(--overlay-pad) * 2));
    border-color: rgba(239, 68, 68, 0.35);
}

.block-icon {
    width: 4.5rem;
    height: 4.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.25rem;
    color: var(--color-cyan);
    border: 1px solid rgba(6, 182, 212, 0.35);
    background: rgba(6, 182, 212, 0.08);
    box-shadow: 0 0 28px rgba(6, 182, 212, 0.2);
}

.block-title {
    font-size: 1.35rem;
    font-weight: 900;
    margin: 0 0 0.75rem;
    letter-spacing: 0.06em;
    color: #fff;
}

.overlay-desc--block {
    margin-bottom: 1.25rem;
}

.block-hint {
    font-size: 9px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(6, 182, 212, 0.65);
    margin: 0;
}

body.is-mobile-blocked #gameCanvas,
body.is-mobile-blocked #hud-layer,
body.is-mobile-blocked #home-btn,
body.is-mobile-blocked .overlay-screen:not(.overlay-screen--block) {
    visibility: hidden;
    pointer-events: none;
}

.overlay-card--narrow { max-width: min(24rem, calc(100vw - var(--overlay-pad) * 2)); }

.overlay-card--cyan   { border-color: rgba(6, 182, 212, 0.3); }
.overlay-card--green  { border-color: rgba(74, 222, 128, 0.4); }
.overlay-card--red    { border-color: rgba(239, 68, 68, 0.4); }

/* ── Start screen (compact, viewport-aware) ── */
.overlay-card--start {
    max-width: var(--start-card-max-w);
    padding: var(--start-card-pad);
    gap: var(--start-gap);
}

.overlay-card--start .start-logo {
    width: auto;
    max-width: min(100%, var(--logo-width));
    height: var(--logo-max-height);
    max-height: var(--logo-max-height);
    margin: 0;
}

.overlay-card--start .overlay-tag {
    margin-bottom: 0;
    max-width: 100%;
    line-height: 1.35;
    white-space: normal;
}

.overlay-card--start .overlay-desc--start {
    margin: 0;
    max-width: min(22rem, 100%);
    line-height: 1.45;
}

.overlay-card--start .btn-action,
.overlay-card--start .overlay-actions {
    width: 100%;
    max-width: min(22rem, 100%);
}

/* ── Start screen logo ── */
.start-logo {
    display: block;
    width: min(100%, var(--logo-width));
    height: auto;
    max-height: var(--logo-max-height);
    margin: 0 auto clamp(0.75rem, min(2.5vw, 2.5vh), 1.25rem);
    object-fit: contain;
    object-position: center;
    flex-shrink: 0;
    filter: drop-shadow(0 0 18px rgba(6, 182, 212, 0.2));
}

.overlay-desc--start {
    margin-bottom: clamp(1rem, min(3vw, 3vh), 1.75rem);
}

.title-main {
    font-size: var(--title-main-size);
    font-weight: 900;
    margin: 0 0 clamp(0.25rem, min(1.5vw, 1.5vh), 0.5rem);
    letter-spacing: -0.025em;
    line-height: 1.1;
    background: linear-gradient(to right, #fff, #cffafe, var(--color-cyan-dim));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.title-sub {
    color: #06b6d4;
    font-weight: 700;
    font-size: clamp(8px, min(2vw, 1.8vh), 10px);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin: 0 0 clamp(0.85rem, min(3vw, 3vh), 2rem);
}

.overlay-desc {
    color: #9ca3af;
    font-size: var(--overlay-desc-size);
    line-height: 1.55;
    margin: 0 0 clamp(1rem, min(3.5vw, 3.5vh), 2.5rem);
    font-weight: 500;
    max-width: min(24rem, 100%);
}

.overlay-desc--sm {
    font-size: 0.75rem;
    margin-bottom: 2rem;
}

/* ── Result icons ── */
.result-icon {
    margin-bottom: 1.5rem;
    border-radius: 50%;
    width: 5rem;
    height: 5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-icon--success {
    color: var(--color-green);
    border: 1px solid rgba(74, 222, 128, 0.5);
    background: rgba(20, 83, 45, 0.2);
    box-shadow: 0 0 30px rgba(74, 222, 128, 0.5);
}

.result-icon--fail {
    color: var(--color-red);
    border: 1px solid rgba(239, 68, 68, 0.5);
    background: rgba(127, 29, 29, 0.2);
    box-shadow: 0 0 30px rgba(239, 68, 68, 0.5);
}

.result-title {
    font-size: 1.5rem;
    font-weight: 900;
    margin: 0 0 0.25rem;
    color: #fff;
}

.result-sub {
    font-size: 10px;
    letter-spacing: 0.1em;
    font-weight: 700;
    text-transform: uppercase;
    margin: 0 0 2rem;
}

.result-sub--green { color: var(--color-green); }
.result-sub--red   { color: var(--color-red); }

.score-row {
    width: 100%;
    margin-bottom: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 1rem;
}

.score-label {
    color: #6b7280;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.score-value {
    font-weight: 900;
    color: var(--color-cyan-dim);
    font-size: 1.25rem;
}

/* ── Buttons ── */
.btn-action {
    width: 100%;
    padding: clamp(0.7rem, min(2.5vw, 2.5vh), 1rem);
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    border-radius: 0.75rem;
    transition: background 0.3s ease, transform 0.1s ease;
    font-size: clamp(0.62rem, min(2vw, 2vh), 0.75rem);
    cursor: pointer;
    font-family: var(--font-hud);
    border: 1px solid;
    flex-shrink: 0;
}

.btn-action:active { transform: scale(0.95); }

.btn-action--cyan {
    background: rgba(22, 78, 99, 0.5);
    color: #cffafe;
    border-color: rgba(6, 182, 212, 0.5);
    box-shadow: 0 0 20px var(--color-cyan-muted);
}

.btn-action--cyan:hover { background: rgba(21, 94, 117, 0.8); }

.btn-action--green {
    background: rgba(20, 83, 45, 0.4);
    color: #dcfce7;
    border-color: rgba(74, 222, 128, 0.5);
    box-shadow: 0 0 20px rgba(74, 222, 128, 0.2);
}

.btn-action--green:hover { background: rgba(22, 101, 52, 0.6); }

.btn-action--red {
    background: rgba(127, 29, 29, 0.4);
    color: #fee2e2;
    border-color: rgba(239, 68, 68, 0.5);
    box-shadow: 0 0 20px rgba(239, 68, 68, 0.2);
}

.btn-action--red:hover { background: rgba(153, 27, 27, 0.6); }

/* ── CSS icon system (no svg / emoji) ── */
.icon {
    display: inline-block;
    position: relative;
    flex-shrink: 0;
    color: currentColor;
}

.icon--home {
    width: 0.95rem;
    height: 0.85rem;
}

.icon--home::before,
.icon--home::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.icon--home::before {
    top: 0;
    border-left: 0.45rem solid transparent;
    border-right: 0.45rem solid transparent;
    border-bottom: 0.4rem solid currentColor;
}

.icon--home::after {
    bottom: 0;
    width: 0.75rem;
    height: 0.45rem;
    background: currentColor;
    border-radius: 1px;
}

.icon--check {
    width: 1.35rem;
    height: 1.35rem;
}

.icon--check::before {
    content: '';
    position: absolute;
    left: 0.2rem;
    top: 0.55rem;
    width: 0.45rem;
    height: 0.2rem;
    background: currentColor;
    transform: rotate(45deg);
    transform-origin: left center;
    border-radius: 1px;
}

.icon--check::after {
    content: '';
    position: absolute;
    left: 0.45rem;
    top: 0.72rem;
    width: 0.85rem;
    height: 0.2rem;
    background: currentColor;
    transform: rotate(-52deg);
    transform-origin: left center;
    border-radius: 1px;
}

.icon--alert {
    width: 0;
    height: 0;
    border-left: 0.65rem solid transparent;
    border-right: 0.65rem solid transparent;
    border-bottom: 1.15rem solid currentColor;
}

.icon--alert::after {
    content: '';
    position: absolute;
    left: 50%;
    top: 0.42rem;
    transform: translateX(-50%);
    width: 0.14rem;
    height: 0.45rem;
    background: rgba(0, 0, 0, 0.85);
    border-radius: 1px;
}

.icon--intel {
    width: 0.55rem;
    height: 0.55rem;
    margin-top: 0.15rem;
    background: currentColor;
    transform: rotate(45deg);
    box-shadow: 0 0 8px rgba(34, 211, 238, 0.45);
}

.icon--wind {
    width: 0.85rem;
    height: 0.55rem;
}

.icon--wind::before,
.icon--wind::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 0.45rem;
    height: 0.12rem;
    background: currentColor;
    border-radius: 9999px;
    transform: translateY(-50%);
}

.icon--wind[data-dir="right"]::before {
    left: 0;
}

.icon--wind[data-dir="right"]::after {
    right: 0;
    width: 0;
    height: 0;
    background: transparent;
    border-top: 0.18rem solid transparent;
    border-bottom: 0.18rem solid transparent;
    border-left: 0.28rem solid currentColor;
    transform: translateY(-50%);
}

.icon--wind[data-dir="left"]::before {
    left: 0;
    width: 0;
    height: 0;
    background: transparent;
    border-top: 0.18rem solid transparent;
    border-bottom: 0.18rem solid transparent;
    border-right: 0.28rem solid currentColor;
    transform: translateY(-50%);
}

.icon--wind[data-dir="left"]::after {
    right: 0;
}

.icon--desktop {
    width: 1.75rem;
    height: 1.35rem;
    border: 2px solid currentColor;
    border-radius: 3px;
}

.icon--desktop::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -0.5rem;
    transform: translateX(-50%);
    width: 0.9rem;
    height: 0.3rem;
    background: currentColor;
    border-radius: 0 0 2px 2px;
}

/* ── Home button (top-left, icon only) ── */
.home-btn {
    position: fixed;
    top: var(--home-offset);
    left: var(--home-offset);
    z-index: var(--z-home);
    width: var(--home-btn-size);
    height: var(--home-btn-size);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    background: rgba(4, 4, 12, 0.85);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid rgba(6, 182, 212, 0.35);
    border-radius: 0.65rem;
    color: var(--color-cyan);
    cursor: pointer;
    box-shadow: 0 0 24px rgba(6, 182, 212, 0.15), inset 0 1px 0 rgba(255, 255, 255, 0.06);
    transition: transform 0.15s ease, border-color 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
    pointer-events: auto;
}

.home-btn:hover {
    border-color: rgba(34, 211, 238, 0.6);
    box-shadow: 0 0 32px rgba(6, 182, 212, 0.35);
    background: rgba(8, 51, 68, 0.9);
    color: #67e8f9;
}

.home-btn:active { transform: scale(0.94); }

body.is-mission-active .hud-stats {
    margin-left: var(--hud-stats-offset);
}

/* ── Enhanced start screen ── */
.overlay-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(6, 182, 212, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(6, 182, 212, 0.04) 1px, transparent 1px);
    background-size: 48px 48px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 75%);
    pointer-events: none;
}

.overlay-bg-scan {
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, transparent 0%, rgba(6, 182, 212, 0.03) 50%, transparent 100%);
    background-size: 100% 200%;
    animation: scanline 6s linear infinite;
    pointer-events: none;
}

@keyframes scanline {
    0%   { background-position: 0 -100%; }
    100% { background-position: 0 100%; }
}

.overlay-tag {
    font-size: clamp(7px, min(1.8vw, 1.8vh), 9px);
    letter-spacing: 0.25em;
    color: rgba(6, 182, 212, 0.7);
    margin-bottom: clamp(0.4rem, min(1.5vw, 1.5vh), 0.75rem);
    padding: 0.25rem clamp(0.5rem, min(2vw, 2vh), 0.75rem);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 9999px;
    background: rgba(6, 182, 212, 0.05);
}

.controls-grid {
    display: grid;
    grid-template-columns: repeat(var(--controls-cols), minmax(0, 1fr));
    gap: var(--controls-gap);
    width: 100%;
    margin-bottom: clamp(1rem, min(3.5vw, 3.5vh), 2rem);
}

.controls-grid__item {
    display: flex;
    flex-direction: column;
    gap: 0.1rem;
    padding: var(--controls-item-pad-y) var(--controls-item-pad-x);
    background: rgba(6, 182, 212, 0.04);
    border: 1px solid rgba(6, 182, 212, 0.12);
    border-radius: 0.5rem;
    min-width: 0;
}

.controls-grid__key {
    font-size: var(--controls-key-size);
    font-weight: 800;
    letter-spacing: 0.12em;
    color: var(--color-cyan-dim);
}

.controls-grid__val {
    font-size: var(--controls-val-size);
    font-weight: 600;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.25;
    overflow-wrap: anywhere;
}

.overlay-actions {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
    width: 100%;
}

.overlay-actions:not(.hidden) ~ #start-btn {
    display: none;
}

.btn-action--ghost {
    background: transparent;
    color: rgba(207, 250, 254, 0.7);
    border-color: rgba(6, 182, 212, 0.25);
    box-shadow: none;
}

.btn-action--ghost:hover {
    background: rgba(6, 182, 212, 0.08);
    color: #cffafe;
}

.btn-action--pulse {
    animation: btnPulse 2.5s ease-in-out infinite;
}

@keyframes btnPulse {
    0%, 100% { box-shadow: 0 0 20px var(--color-cyan-muted); }
    50%      { box-shadow: 0 0 36px rgba(6, 182, 212, 0.45); }
}

/* ── Mission briefing overlay ── */
.overlay-screen--briefing {
    background: linear-gradient(160deg, #010103 0%, #0a0a18 45%, #010103 100%);
}

.overlay-bg-grid--briefing {
    opacity: 0.6;
}

.overlay-card--briefing {
    max-width: min(36rem, calc(100vw - var(--overlay-pad) * 2));
    border-color: rgba(6, 182, 212, 0.35);
    text-align: left;
    align-items: stretch;
    position: relative;
    overflow: hidden;
}

.overlay-card--briefing::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--color-cyan), transparent);
}

.briefing-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.briefing-badge {
    font-size: 9px;
    letter-spacing: 0.2em;
    color: var(--color-cyan-dim);
    padding: 0.3rem 0.65rem;
    border: 1px solid rgba(6, 182, 212, 0.25);
    border-radius: 0.35rem;
    background: rgba(6, 182, 212, 0.06);
}

.briefing-level {
    font-size: 0.75rem;
    font-weight: 800;
    color: #a5f3fc;
    letter-spacing: 0.1em;
}

.briefing-codename {
    font-size: var(--briefing-title-size);
    font-weight: 900;
    margin: 0 0 0.5rem;
    letter-spacing: 0.04em;
    background: linear-gradient(to right, #fff, #67e8f9);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.briefing-desc {
    color: #9ca3af;
    font-size: 0.85rem;
    line-height: 1.55;
    margin: 0 0 1.25rem;
}

.briefing-intel {
    display: grid;
    grid-template-columns: repeat(var(--briefing-intel-cols), 1fr);
    gap: 0.65rem;
    margin-bottom: 1.25rem;
}

.intel-card {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.65rem 0.75rem;
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 0.5rem;
}

.intel-label {
    font-size: 8px;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: #6b7280;
}

.intel-value {
    font-size: 0.75rem;
    font-weight: 700;
    color: #e5e7eb;
}

.intel-value--wind { color: #67e8f9; }

.intel-value--with-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.intel-value--mono {
    font-family: ui-monospace, monospace;
    font-size: 0.7rem;
    color: var(--color-cyan-dim);
}
.intel-value--threat { color: var(--color-yellow); }

.briefing-objectives {
    list-style: none;
    margin: 0 0 1.25rem;
    padding: 0;
}

.briefing-objectives li {
    position: relative;
    padding: 0.45rem 0 0.45rem 1.35rem;
    font-size: 0.8rem;
    color: rgba(207, 250, 254, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.briefing-objectives li::before {
    content: '';
    position: absolute;
    left: 0.15rem;
    top: 0.72rem;
    width: 0;
    height: 0;
    border-top: 0.22rem solid transparent;
    border-bottom: 0.22rem solid transparent;
    border-left: 0.38rem solid var(--color-cyan-dim);
}

.briefing-tip {
    display: flex;
    align-items: flex-start;
    gap: 0.65rem;
    padding: 0.75rem 1rem;
    margin-bottom: 1.5rem;
    background: rgba(6, 182, 212, 0.06);
    border: 1px solid rgba(6, 182, 212, 0.15);
    border-radius: 0.5rem;
    font-size: 0.75rem;
    color: rgba(165, 243, 252, 0.9);
    line-height: 1.5;
}

.briefing-tip .icon--intel {
    color: var(--color-cyan);
}

/* ══════════════════════════════════════════════════════════════
   Responsive breakpoints
   Small Mobile ≤480 | Mobile ≤640 | Tablet Portrait 641–768
   Tablet Landscape 769–1024 | Desktop ≥1025
   Landscape Mobile: orientation landscape + max-height 500px
   ══════════════════════════════════════════════════════════════ */

/* ── Small Mobile (≤480px) ── */
@media (max-width: 480px) {
    :root {
        --space-hud: 0.65rem;
        --home-btn-size: 2.35rem;
        --home-offset: 0.65rem;
        --hud-stats-offset: 2.85rem;
        --stat-value-lg: 1rem;
        --stat-value-md: 0.75rem;
        --threat-bar-width: 4.25rem;
        --steady-track-height: 6.5rem;
        --controls-cols: 2;
        --briefing-intel-cols: 1;
        --overlay-card-max-w: min(32rem, calc(100vw - var(--overlay-pad) * 2));
        --stat-label-size: 7px;
        --stat-panel-pad-y: 0.35rem;
        --stat-panel-pad-x: 0.55rem;
        --stat-panel-radius: 0.5rem;
        --hud-stats-gap: 0.4rem;
        --threat-gauge-gap: 0.4rem;
        --threat-label-size: 0.625rem;
        --steady-gauge-left: 0.65rem;
        --steady-label-size: 7px;
        --ammo-panel-pad-y: 0.5rem;
        --ammo-panel-pad-x: 0.75rem;
        --ammo-panel-gap: 0.75rem;
        --ammo-count-size: 1.15rem;
    }

    .briefing-header { flex-direction: column; align-items: flex-start; gap: 0.35rem; }
    .briefing-desc { font-size: 0.78rem; }
    .briefing-objectives li { font-size: 0.72rem; }
    .result-icon { width: 4rem; height: 4rem; }
    .result-title { font-size: 1.2rem; }
    .block-title { font-size: 1.1rem; }
}

/* ── Mobile (481px – 640px) ── */
@media (min-width: 481px) and (max-width: 640px) {
    :root {
        --space-hud: 0.75rem;
        --home-btn-size: 2.45rem;
        --home-offset: 0.75rem;
        --hud-stats-offset: 3rem;
        --stat-value-lg: 1.1rem;
        --stat-value-md: 0.8125rem;
        --threat-bar-width: 4.75rem;
        --steady-track-height: 7.5rem;
        --controls-cols: 2;
        --briefing-intel-cols: 2;
        --hud-stats-gap: 0.5rem;
        --stat-panel-pad-y: 0.4rem;
        --stat-panel-pad-x: 0.65rem;
        --steady-gauge-left: 0.75rem;
    }
}

/* ── Tablet Portrait (641px – 768px) ── */
@media (min-width: 641px) and (max-width: 768px) {
    :root {
        --space-hud: 1rem;
        --home-btn-size: 2.55rem;
        --home-offset: 1rem;
        --hud-stats-offset: 3.15rem;
        --stat-value-lg: 1.2rem;
        --stat-value-md: 0.875rem;
        --threat-bar-width: 5.25rem;
        --steady-track-height: 8.5rem;
        --controls-cols: 3;
        --briefing-intel-cols: 2;
    }

    .stat-panel--md-only { display: flex; }
    .tactical-briefing { display: block; max-width: 16rem; font-size: 9px; }
    .hud-top { flex-wrap: wrap; gap: 0.65rem; }
    .threat-gauge { margin-left: auto; }
}

/* ── Tablet Landscape (769px – 1024px) ── */
@media (min-width: 769px) and (max-width: 1024px) {
    :root {
        --space-hud: 1.15rem;
        --home-btn-size: 2.6rem;
        --home-offset: 1.15rem;
        --hud-stats-offset: 3.25rem;
        --stat-value-lg: 1.3rem;
        --stat-value-md: 0.9rem;
        --threat-bar-width: 5.5rem;
        --steady-track-height: 9rem;
        --controls-cols: 3;
        --briefing-intel-cols: 4;
        --overlay-card-max-w: min(34rem, calc(100vw - var(--overlay-pad) * 2));
    }

    .stat-panel--md-only { display: flex; }
    .stat-panel--lg-only { display: flex; }
    .tactical-briefing { display: block; }
}

/* ── Desktop (≥1025px) ── */
@media (min-width: 1025px) {
    :root {
        --space-hud: 1.5rem;
        --home-btn-size: 2.75rem;
        --home-offset: 1.25rem;
        --hud-stats-offset: 3.5rem;
        --stat-value-lg: 1.5rem;
        --stat-value-md: 1rem;
        --threat-bar-width: 6.5rem;
        --steady-track-height: 10.5rem;
        --controls-cols: 3;
        --briefing-intel-cols: 4;
        --overlay-card-max-w: min(36rem, calc(100vw - var(--overlay-pad) * 2));
    }

    .stat-panel--md-only { display: flex; }
    .stat-panel--lg-only { display: flex; }
    .tactical-briefing { display: block; }
    .overlay-card--briefing { max-width: min(40rem, calc(100vw - var(--overlay-pad) * 2)); }
}

/* ── Landscape Mobile (phones on side) ── */
@media (orientation: landscape) and (max-height: 500px) {
    :root {
        --space-hud: 0.55rem;
        --home-btn-size: 2.25rem;
        --home-offset: 0.55rem;
        --hud-stats-offset: 2.75rem;
        --steady-track-height: 5rem;
        --controls-cols: 3;
        --emblem-size: clamp(2.25rem, 8vh, 3rem);
        --logo-width: clamp(9.5rem, 68vw, 20rem);
        --logo-max-height: clamp(2.75rem, 14vh, 4rem);
        --start-card-max-w: min(26rem, calc(100vw - var(--overlay-pad) * 2));
        --start-gap: clamp(0.3rem, 1.4vh, 0.55rem);
        --stat-value-lg: clamp(0.7rem, 2.2vh, 0.9rem);
        --stat-value-md: clamp(0.58rem, 1.7vh, 0.72rem);
        --ammo-count-size: clamp(0.8rem, 2.3vh, 1rem);
    }

    .hud-layer { justify-content: flex-start; gap: 0.35rem; }
    .hud-bottom { margin-top: auto; }
    .steady-gauge {
        top: auto;
        bottom: var(--space-hud);
        left: var(--space-hud);
        transform: none;
        flex-direction: row;
        align-items: flex-end;
        gap: 0.35rem;
    }

    .steady-label {
        transform: none;
        translate: none;
        margin-bottom: 0.25rem;
    }

    .steady-track {
        width: 5rem;
        height: 0.45rem;
        flex-direction: row;
        justify-content: flex-start;
    }

    .steady-fill {
        width: calc(var(--gauge-fill, 100) * 1%);
        height: 100%;
    }

    .system-alert { top: 18%; }
}

/* ── Short viewport — embedded iframe / game portal (any width) ── */
@media (max-height: 720px) {
    :root {
        --overlay-pad: clamp(0.55rem, 2vh, 1.25rem);
        --overlay-card-pad: clamp(0.85rem, 2.2vh, 1.5rem);
        --title-main-size: clamp(1.25rem, min(5vw, 4.5vh), 2.25rem);
        --emblem-size: clamp(2.5rem, min(10vw, 9vh), 4rem);
        --logo-width: clamp(10rem, 72vw, 24rem);
        --logo-max-height: clamp(3rem, 16vh, 5.5rem);
        --start-card-max-w: min(28rem, calc(100vw - var(--overlay-pad) * 2));
        --start-gap: clamp(0.35rem, min(1.8vw, 1.6vh), 0.7rem);
        --overlay-desc-size: clamp(0.72rem, min(2vw, 1.9vh), 0.85rem);
        --controls-cols: 3;
        /* HUD — scale down in short embeds without affecting tall desktop */
        --space-hud: clamp(0.55rem, 1.5vh, 1rem);
        --home-btn-size: clamp(2rem, 4.8vh, 2.5rem);
        --home-offset: clamp(0.55rem, 1.5vh, 1rem);
        --hud-stats-offset: clamp(2.4rem, 6.5vh, 3.15rem);
        --stat-value-lg: clamp(0.85rem, 2.6vh, 1.2rem);
        --stat-value-md: clamp(0.68rem, 2vh, 0.875rem);
        --stat-label-size: clamp(6px, 1.35vh, 8px);
        --stat-panel-pad-y: clamp(0.28rem, 1vh, 0.42rem);
        --stat-panel-pad-x: clamp(0.42rem, 1.4vh, 0.7rem);
        --stat-panel-radius: clamp(0.4rem, 1.2vh, 0.65rem);
        --hud-stats-gap: clamp(0.3rem, 1vh, 0.55rem);
        --hud-accent-border: 3px;
        --threat-bar-width: clamp(3.25rem, 9vh, 5rem);
        --threat-bar-height: clamp(0.3rem, 0.9vh, 0.45rem);
        --threat-label-size: clamp(0.55rem, 1.7vh, 0.68rem);
        --threat-gauge-gap: clamp(0.35rem, 1vh, 0.55rem);
        --steady-track-height: clamp(4.5rem, 12vh, 7.5rem);
        --steady-gauge-left: clamp(0.55rem, 1.5vh, 1rem);
        --steady-label-size: clamp(6px, 1.3vh, 8px);
        --steady-track-width: clamp(0.35rem, 0.9vh, 0.45rem);
        --ammo-count-size: clamp(0.95rem, 2.8vh, 1.2rem);
        --ammo-panel-pad-y: clamp(0.4rem, 1.2vh, 0.6rem);
        --ammo-panel-pad-x: clamp(0.55rem, 1.6vh, 0.9rem);
        --ammo-panel-gap: clamp(0.5rem, 1.4vh, 0.85rem);
        --ammo-label-size: clamp(6px, 1.3vh, 8px);
        --ammo-divider-height: clamp(1.25rem, 3.5vh, 1.65rem);
        --alert-text-size: clamp(0.6rem, 1.8vh, 0.7rem);
        --tactical-briefing-size: clamp(8px, 1.5vh, 9px);
    }

    .overlay-card {
        max-height: min(94vh, 94dvh);
    }

    .overlay-card--briefing {
        max-height: min(92vh, 92dvh);
    }

    .tactical-briefing {
        max-width: 14rem;
        padding: 0.65rem;
    }

    .hud-top {
        flex-wrap: wrap;
        gap: 0.45rem;
    }

    .threat-gauge {
        margin-left: auto;
    }
}

/* Portal embed: wide + short (e.g. game page with sidebar) */
@media (max-height: 720px) and (min-width: 640px) {
    :root {
        --logo-width: min(92vw, 32rem);
        --logo-max-height: clamp(6rem, 30vh, 9.5rem);
        --start-card-max-w: min(34rem, calc(100vw - var(--overlay-pad) * 2));
        --start-card-pad: clamp(1.35rem, min(3.5vw, 3.2vh), 2.25rem);
        --start-gap: clamp(0.35rem, 1.4vh, 0.65rem);
    }
}

@media (max-height: 620px) and (min-width: 640px) {
    :root {
        --logo-width: min(88vw, 28rem);
        --logo-max-height: clamp(5rem, 26vh, 8rem);
        --start-card-max-w: min(30rem, calc(100vw - var(--overlay-pad) * 2));
        --start-card-pad: clamp(1.15rem, min(3vw, 2.8vh), 1.85rem);
    }
}

@media (max-height: 620px) {
    :root {
        --overlay-pad: clamp(0.45rem, 1.8vh, 1rem);
        --overlay-card-pad: clamp(0.7rem, 2vh, 1.2rem);
        --start-card-max-w: min(26rem, calc(100vw - var(--overlay-pad) * 2));
        --start-card-pad: clamp(1rem, min(2.8vw, 2.5vh), 1.5rem);
        --start-gap: clamp(0.28rem, 1.3vh, 0.55rem);
        --controls-cols: 3;
        --controls-gap: clamp(0.25rem, 1vh, 0.4rem);
        --controls-item-pad-y: clamp(0.25rem, 1vh, 0.4rem);
        --controls-item-pad-x: clamp(0.3rem, 1.2vh, 0.5rem);
        --space-hud: clamp(0.45rem, 1.3vh, 0.75rem);
        --home-btn-size: clamp(1.85rem, 4.2vh, 2.25rem);
        --hud-stats-offset: clamp(2.1rem, 5.8vh, 2.75rem);
        --stat-value-lg: clamp(0.75rem, 2.3vh, 1rem);
        --stat-value-md: clamp(0.62rem, 1.8vh, 0.78rem);
        --stat-label-size: clamp(5px, 1.2vh, 7px);
        --stat-panel-pad-y: clamp(0.22rem, 0.85vh, 0.35rem);
        --stat-panel-pad-x: clamp(0.35rem, 1.2vh, 0.55rem);
        --hud-stats-gap: clamp(0.25rem, 0.85vh, 0.4rem);
        --threat-bar-width: clamp(2.75rem, 8vh, 4rem);
        --threat-label-size: clamp(0.5rem, 1.5vh, 0.6rem);
        --steady-track-height: clamp(3.5rem, 10vh, 5.5rem);
        --ammo-count-size: clamp(0.85rem, 2.4vh, 1.05rem);
        --ammo-panel-pad-y: clamp(0.32rem, 1vh, 0.48rem);
        --ammo-panel-pad-x: clamp(0.45rem, 1.3vh, 0.65rem);
        --ammo-panel-gap: clamp(0.4rem, 1.2vh, 0.6rem);
        --ammo-divider-height: clamp(1rem, 3vh, 1.35rem);
    }

    .overlay-card {
        max-height: min(92vh, 92dvh);
    }

    .title-main {
        margin-bottom: 0.35rem;
    }

    .stat-panel--lg-only {
        display: none !important;
    }

    .tactical-briefing {
        display: none !important;
    }
}

@media (max-height: 520px) {
    :root {
        --overlay-pad: clamp(0.35rem, 1.5vh, 0.75rem);
        --overlay-card-pad: clamp(0.6rem, 1.8vh, 1rem);
        --start-card-max-w: min(24rem, calc(100vw - var(--overlay-pad) * 2));
        --start-card-pad: clamp(0.85rem, min(2.5vw, 2.2vh), 1.25rem);
        --start-gap: clamp(0.22rem, 1.1vh, 0.45rem);
        --overlay-desc-size: clamp(0.68rem, min(1.8vw, 1.7vh), 0.78rem);
        --controls-cols: 3;
        --controls-key-size: 7px;
        --controls-val-size: 8px;
        --space-hud: clamp(0.35rem, 1.1vh, 0.55rem);
        --home-btn-size: clamp(1.7rem, 3.8vh, 2rem);
        --hud-stats-offset: clamp(1.9rem, 5vh, 2.4rem);
        --stat-value-lg: clamp(0.68rem, 2vh, 0.9rem);
        --stat-value-md: clamp(0.58rem, 1.6vh, 0.7rem);
        --stat-label-size: 5px;
        --stat-panel-pad-y: 0.2rem;
        --stat-panel-pad-x: 0.3rem;
        --stat-panel-radius: 0.35rem;
        --hud-stats-gap: 0.2rem;
        --hud-accent-border: 2px;
        --threat-bar-width: clamp(2.25rem, 7vh, 3.25rem);
        --threat-bar-height: 0.28rem;
        --threat-label-size: clamp(0.45rem, 1.3vh, 0.55rem);
        --steady-track-height: clamp(2.75rem, 8vh, 4rem);
        --ammo-count-size: clamp(0.75rem, 2.1vh, 0.95rem);
        --ammo-panel-pad-y: 0.28rem;
        --ammo-panel-pad-x: 0.4rem;
        --ammo-panel-gap: 0.35rem;
        --ammo-divider-height: 0.9rem;
        --ammo-label-size: 5px;
        --alert-text-size: clamp(0.55rem, 1.5vh, 0.62rem);
    }

    .overlay-card {
        max-height: min(90vh, 90dvh);
        border-radius: 0.75rem;
    }

    .overlay-tag {
        letter-spacing: 0.18em;
    }

    .title-main {
        letter-spacing: -0.02em;
    }

    .stat-panel--md-only {
        display: none !important;
    }
}

/* Narrow screens: smaller logo on short heights */
@media (max-height: 620px) and (max-width: 639px) {
    :root {
        --logo-width: clamp(9rem, 66vw, 21rem);
        --logo-max-height: clamp(2.65rem, 14vh, 4.25rem);
    }
}

@media (max-height: 520px) and (max-width: 639px) {
    :root {
        --logo-width: clamp(8rem, 62vw, 18rem);
        --logo-max-height: clamp(2.25rem, 12vh, 3.5rem);
    }
}

/* Wide + short embeds (portal layout): keep controls readable in 3 columns */
@media (min-width: 640px) and (max-height: 580px) {
    :root {
        --controls-cols: 3;
        --overlay-card-max-w: min(38rem, calc(100vw - var(--overlay-pad) * 2));
    }
}

/* Narrow + short: stack controls in 2 columns */
@media (max-width: 520px) and (max-height: 640px) {
    :root {
        --controls-cols: 2;
        --logo-width: clamp(8.5rem, 88vw, 20rem);
        --start-card-max-w: calc(100vw - var(--overlay-pad) * 2);
    }
}

/* Tall desktop / fullscreen — larger logo without affecting short embeds */
@media (min-height: 820px) and (min-width: 1025px) {
    :root {
        --logo-width: clamp(18rem, 42vw, 28rem);
        --logo-max-height: clamp(5.5rem, 20vh, 8.5rem);
        --start-card-max-w: min(32rem, calc(100vw - var(--overlay-pad) * 2));
        --start-card-pad: clamp(1.75rem, min(4vw, 3.5vh), 3.25rem);
    }
}