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

:root {
    --bg: #ffffff;
    --ink: #1f2937;
    --ink-soft: rgba(31, 41, 55, 0.72);
    --border: rgba(17, 24, 39, 0.08);
    --shadow: 0 12px 28px rgba(17, 24, 39, 0.12);
    --btn-shadow-soft:
        0 10px 18px rgba(15, 23, 42, 0.12),
        0 22px 34px rgba(15, 23, 42, 0.08),
        0 1px 0 rgba(255, 255, 255, 0.46) inset;
    --btn-shadow-soft-hover:
        0 12px 22px rgba(15, 23, 42, 0.15),
        0 26px 38px rgba(15, 23, 42, 0.1),
        0 1px 0 rgba(255, 255, 255, 0.38) inset;
    --btn-shadow-dark:
        0 12px 20px rgba(3, 7, 18, 0.28),
        0 24px 40px rgba(15, 23, 42, 0.18),
        0 1px 0 rgba(255, 255, 255, 0.08) inset;
    --btn-shadow-dark-hover:
        0 14px 24px rgba(3, 7, 18, 0.32),
        0 28px 42px rgba(15, 23, 42, 0.2),
        0 1px 0 rgba(255, 255, 255, 0.1) inset;

    --ui-scale: 0.94;
    --font-pixel: "Margarine", "Trebuchet MS", "Segoe UI", sans-serif;
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --home-title-size: clamp(56px, 10vw, 104px);
}

html,
body {
    width: 100%;
    min-height: 100%;
    min-height: 100svh;
    min-height: 100dvh;
    overflow: hidden;
    background: var(--bg);
    color: var(--ink);
    font-family: var(--font-pixel);
    font-size: calc(16px * var(--ui-scale));
    overscroll-behavior: none;
}

button {
    border: 0;
    background: transparent;
    cursor: pointer;
    font: inherit;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 3px solid rgba(37, 99, 235, 0.72);
    outline-offset: 3px;
}

#app-shell,
#game-wrapper {
    position: relative;
    width: 100%;
    height: 100vh;
    height: 100svh;
    height: 100dvh;
    min-height: 100svh;
    min-height: 100dvh;
    overflow: hidden;
}

#game-wrapper::after {
    content: "";
    position: absolute;
    inset: 0 0 auto 0;
    height: 20vh;
    z-index: 3;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.58) 0%, rgba(15, 23, 42, 0.34) 38%, rgba(15, 23, 42, 0.14) 72%, rgba(15, 23, 42, 0) 100%);
}

#game-wrapper::before {
    content: "";
    position: absolute;
    inset: auto 0 0 0;
    height: 22vh;
    z-index: 3;
    pointer-events: none;
    background: linear-gradient(0deg, rgba(15, 23, 42, 0.5) 0%, rgba(15, 23, 42, 0.26) 42%, rgba(15, 23, 42, 0.08) 76%, rgba(15, 23, 42, 0) 100%);
}

.circuit-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    background-color: #ffffff;
    background-image:
        repeating-linear-gradient(0deg, transparent, transparent 19px, rgba(75, 85, 99, 0.08) 19px, rgba(75, 85, 99, 0.08) 20px, transparent 20px, transparent 39px, rgba(75, 85, 99, 0.08) 39px, rgba(75, 85, 99, 0.08) 40px),
        repeating-linear-gradient(90deg, transparent, transparent 19px, rgba(75, 85, 99, 0.08) 19px, rgba(75, 85, 99, 0.08) 20px, transparent 20px, transparent 39px, rgba(75, 85, 99, 0.08) 39px, rgba(75, 85, 99, 0.08) 40px),
        radial-gradient(circle at 20px 20px, rgba(55, 65, 81, 0.12) 2px, transparent 2px),
        radial-gradient(circle at 40px 40px, rgba(55, 65, 81, 0.12) 2px, transparent 2px);
    background-size: 40px 40px;
}

#gameCanvas,
.scene-vignette,
.screen,
#hud,
#touchControls {
    position: absolute;
    inset: 0;
}

#gameCanvas {
    z-index: 1;
    width: 100%;
    height: 100%;
    display: block;
    touch-action: none;
}

.scene-vignette {
    z-index: 2;
    pointer-events: none;
}

.screen {
    z-index: 5;
    transition: opacity 0.22s ease, transform 0.22s ease;
}

.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
}

.screen.hidden,
#hud.hidden,
#touchControls.hidden,
.room-modal.hidden {
    display: none !important;
}

.room-view.hidden,
#hud .hidden {
    display: none !important;
}

.home-screen,
#gameOverScreen {
    display: grid;
    place-items: center;
    padding:
        max(calc(20px * var(--ui-scale)), var(--safe-top))
        max(calc(16px * var(--ui-scale)), var(--safe-right))
        max(calc(20px * var(--ui-scale)), var(--safe-bottom))
        max(calc(16px * var(--ui-scale)), var(--safe-left));
}

.home-lang-btn {
    position: absolute;
    top: calc(20px * var(--ui-scale));
    right: calc(20px * var(--ui-scale));
    z-index: 7;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 68px;
    min-height: 38px;
    padding: 0 10px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--btn-shadow-soft);
    color: #0f172a;
    pointer-events: auto;
    touch-action: manipulation;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.home-help-btn {
    position: absolute;
    top: calc(20px * var(--ui-scale));
    right: calc(96px * var(--ui-scale));
    z-index: 7;
    width: 38px;
    height: 38px;
    display: inline-grid;
    place-items: center;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.9);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--btn-shadow-soft);
    color: #0f172a;
    font-size: 19px;
    font-weight: 900;
    line-height: 1;
    pointer-events: auto;
    touch-action: manipulation;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.help-panel {
    position: absolute;
    top: calc(66px * var(--ui-scale));
    right: calc(20px * var(--ui-scale));
    z-index: 8;
    width: min(calc(100vw - 40px), 300px);
    padding: 12px 14px;
    border-radius: 14px;
    border: 1px solid rgba(255, 255, 255, 0.78);
    background: rgba(15, 23, 42, 0.88);
    box-shadow: 0 18px 42px rgba(15, 23, 42, 0.22);
    color: rgba(248, 250, 252, 0.96);
    pointer-events: auto;
}

.help-panel.hidden {
    display: none;
}

.help-panel h2 {
    margin: 0 0 6px;
    font-size: 14px;
    line-height: 1.2;
}

.help-panel p {
    margin: 0;
    font-size: 13px;
    line-height: 1.42;
}

.home-lang-btn > * {
    pointer-events: none;
}

.home-lang-btn svg {
    width: 15px;
    height: 15px;
    fill: currentColor;
}

.home-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding:
        max(calc(24px * var(--ui-scale)), var(--safe-top))
        max(calc(28px * var(--ui-scale)), var(--safe-right))
        max(calc(24px * var(--ui-scale)), var(--safe-bottom))
        max(calc(28px * var(--ui-scale)), var(--safe-left));
    /* Dark overlay để home UI nổi bật — chỉ áp dụng ở home screen */
    background: rgba(5, 10, 28, 0.38);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
}

#gameOverScreen {
    align-content: center;
    justify-items: center;
    gap: 14px;
    background: rgba(15, 23, 42, 0.03);
    backdrop-filter: blur(1.5px);
    -webkit-backdrop-filter: blur(1.5px);
}

.home-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: clamp(24px, 4vh, 42px);
    width: 100%;
    max-width: 520px;
    margin: auto 0;
    padding: clamp(20px, 4vw, calc(32px * var(--ui-scale))) 0;
    text-align: center;
}

.home-actions-wrapper {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 420px;
    gap: calc(18px * var(--ui-scale));
    align-items: center;
    padding: 0 clamp(16px, 8vw, 48px); /* co giãn theo chiều rộng màn hình */
}

.home-online-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: calc(12px * var(--ui-scale));
    width: 100%;
    max-width: 420px;
    align-items: stretch;
    justify-self: center;
}

.home-online-actions > * {
    width: 100%;
    min-width: 0;
    justify-self: stretch;
}

#playOfflineBtn {
    width: 100%;
    max-width: 420px;
    justify-self: center;
}

.username-field {
    width: 100%;
    max-width: 420px;
    display: grid;
    gap: 8px;
    justify-items: start;
    justify-self: center;
}

.username-label {
    font-size: calc(11px * var(--ui-scale));
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(71, 85, 105, 0.88);
}

.username-input {
    width: 100%;
    min-height: calc(50px * var(--ui-scale));
    padding: 0 calc(16px * var(--ui-scale));
    border-radius: calc(20px * var(--ui-scale));
    border: 1px solid rgba(255, 255, 255, 0.82);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.66)),
        linear-gradient(135deg, rgba(255, 255, 255, 0.7), rgba(191, 219, 254, 0.28));
    box-shadow:
        0 18px 34px rgba(15, 23, 42, 0.14),
        0 12px 20px rgba(255, 255, 255, 0.62) inset,
        0 -10px 18px rgba(148, 163, 184, 0.16) inset,
        0 1px 0 rgba(255, 255, 255, 0.92) inset;
    backdrop-filter: blur(20px) saturate(155%);
    -webkit-backdrop-filter: blur(20px) saturate(155%);
    color: #0f172a;
    font-size: calc(15px * var(--ui-scale));
    outline: none;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.username-input:focus {
    transform: translateY(-1px);
    border-color: rgba(255, 255, 255, 0.92);
    box-shadow:
        0 22px 38px rgba(15, 23, 42, 0.16),
        0 0 0 4px rgba(191, 219, 254, 0.22),
        0 10px 18px rgba(255, 255, 255, 0.52) inset,
        0 -10px 18px rgba(148, 163, 184, 0.14) inset,
        0 1px 0 rgba(255, 255, 255, 0.9) inset;
}

.username-input.invalid {
    border-color: rgba(220, 38, 38, 0.48);
    box-shadow: 0 0 0 4px rgba(248, 113, 113, 0.14);
}

.username-input::placeholder {
    color: rgba(51, 65, 85, 0.62);
}

.username-hint {
    min-height: 0;
    width: min(100%, 360px);
    color: rgba(71, 85, 105, 0.78);
    font-size: calc(11px * var(--ui-scale));
    line-height: 1.5;
}

.username-hint:empty {
    display: none;
}

.username-hint.invalid {
    color: #b91c1c;
}

.game-title-big {
    font-family: var(--font-pixel);
    font-size: var(--home-title-size);
    line-height: 0.9;
    letter-spacing: -0.02em;
    color: #111827;
    transform: translateY(calc(-124px * var(--ui-scale)));
}

.play-btn,
.ghost-btn {
    min-width: 0;
    min-height: calc(50px * var(--ui-scale));
    padding: 0 calc(22px * var(--ui-scale));
    border-radius: 999px;
    border: 1px solid rgba(17, 24, 39, 0.12);
    box-shadow: var(--btn-shadow-soft);
    transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.play-btn:hover,
.ghost-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--btn-shadow-soft-hover);
}

.play-btn {
    background: #111827;
    color: #ffffff;
    font-size: calc(15px * var(--ui-scale));
    font-weight: 700;
    box-shadow: var(--btn-shadow-dark);
}

.ghost-btn {
    background: rgba(255, 255, 255, 0.82);
    color: rgba(30, 41, 59, 0.88);
    font-size: calc(14px * var(--ui-scale));
    font-weight: 700;
}

.hero-play {
    min-width: 0;
    width: 100%;
}

#homeJoinRoomBtn,
#playOnlineBtn {
    position: relative;
    overflow: hidden;
    border-color: rgba(255, 255, 255, 0.84);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.68)),
        linear-gradient(135deg, rgba(255, 255, 255, 0.72), rgba(191, 219, 254, 0.3));
    box-shadow:
        0 18px 30px rgba(15, 23, 42, 0.14),
        0 12px 20px rgba(255, 255, 255, 0.6) inset,
        0 -10px 18px rgba(148, 163, 184, 0.16) inset,
        0 1px 0 rgba(255, 255, 255, 0.92) inset;
    backdrop-filter: blur(20px) saturate(155%);
    -webkit-backdrop-filter: blur(20px) saturate(155%);
    color: rgba(15, 23, 42, 0.9);
}

#homeJoinRoomBtn::before,
#playOnlineBtn::before {
    content: "";
    position: absolute;
    inset: 1px;
    border-radius: inherit;
    pointer-events: none;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.46), rgba(255, 255, 255, 0.14) 42%, rgba(255, 255, 255, 0.2));
    opacity: 1;
}

#homeJoinRoomBtn:hover,
#playOnlineBtn:hover {
    border-color: rgba(255, 255, 255, 0.92);
    box-shadow:
        0 22px 36px rgba(15, 23, 42, 0.16),
        0 12px 20px rgba(255, 255, 255, 0.52) inset,
        0 -10px 18px rgba(148, 163, 184, 0.14) inset,
        0 1px 0 rgba(255, 255, 255, 0.92) inset;
    color: rgba(2, 6, 23, 0.96);
}

.play-btn > *,
.ghost-btn > *,
.room-btn > *,
.revive-chip > *,
.home-icon-btn > *,
.hud-home-btn > *,
.room-head-btn > *,
.room-copy-icon-btn > * {
    pointer-events: none;
}


#hud {
    z-index: 7;
    position: absolute;
    inset: 0;
    padding: 0;
    pointer-events: none;
}

.hud-home-btn {
    position: absolute;
    top: calc(16px * var(--ui-scale));
    right: calc(18px * var(--ui-scale));
    left: auto;
    z-index: 8;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.84);
    border: 1px solid rgba(17, 24, 39, 0.08);
    box-shadow: 0 10px 22px rgba(17, 24, 39, 0.08);
    color: #111827;
    pointer-events: auto;
}

.hud-home-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.best-score-hud,
.score-hud {
    position: absolute;
    pointer-events: none;
    white-space: nowrap;
}

.best-score-hud {
    top: max(calc(18px * var(--ui-scale)), calc(var(--safe-top) + 18px));
    left: max(calc(18px * var(--ui-scale)), calc(var(--safe-left) + 18px));
    min-height: calc(38px * var(--ui-scale));
    padding: calc(8px * var(--ui-scale)) calc(18px * var(--ui-scale));
    border-radius: 999px;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.38)),
        linear-gradient(135deg, rgba(255, 255, 255, 0.42), rgba(226, 232, 240, 0.16));
    border: 1px solid rgba(255, 255, 255, 0.76);
    box-shadow:
        0 12px 24px rgba(15, 23, 42, 0.08),
        0 6px 12px rgba(255, 255, 255, 0.46) inset,
        0 1px 0 rgba(255, 255, 255, 0.74) inset;
    backdrop-filter: blur(10px) saturate(130%);
    -webkit-backdrop-filter: blur(10px) saturate(130%);
    font-size: clamp(14px, 1.45vw, 18px);
    font-weight: 800;
    color: rgba(30, 41, 59, 0.88);
    text-align: center;
}

.score-hud {
    top: max(calc(64px * var(--ui-scale)), calc(var(--safe-top) + 64px));
    left: 50%;
    transform: translateX(-50%);
    max-width: calc(100vw - 180px);
    font-size: clamp(56px, 8.8vw, 86px);
    font-weight: 900;
    line-height: 1;
    letter-spacing: -0.03em;
    color: #0f172a;
    text-align: center;
    text-shadow:
        0 3px 18px rgba(255, 255, 255, 0.72),
        0 10px 24px rgba(15, 23, 42, 0.12);
}

.score-hud.bump {
    transform: translateX(-50%) scale(1.03);
}

.score-hud.new-record {
    color: #16a34a;
    text-shadow:
        0 0 18px rgba(134, 239, 172, 0.64),
        0 10px 24px rgba(22, 163, 74, 0.22);
}

.score-hud.record-pop {
    transform: translateX(-50%) scale(1.12);
}

.best-score-hud.new-record {
    color: #ecfdf5;
    background:
        linear-gradient(180deg, rgba(34, 197, 94, 0.94), rgba(22, 163, 74, 0.9)),
        linear-gradient(135deg, rgba(187, 247, 208, 0.42), rgba(21, 128, 61, 0.2));
    border-color: rgba(187, 247, 208, 0.78);
    box-shadow:
        0 14px 28px rgba(22, 163, 74, 0.22),
        0 7px 14px rgba(220, 252, 231, 0.34) inset,
        0 1px 0 rgba(240, 253, 244, 0.72) inset;
}

.best-score-hud.record-pop {
    transform: scale(1.06);
}

.score-hud.checkpoint-pop {
    color: #0f3d66;
    text-shadow:
        0 0 18px rgba(147, 197, 253, 0.56),
        0 10px 24px rgba(59, 130, 246, 0.18);
    transform: translateX(-50%) scale(1.08);
}

.gameover-respawn {
    display: grid;
    gap: 8px;
    justify-items: stretch;
    width: 100%;
    padding: 0;
    margin-top: 0;
}

.compact-play {
    width: 100%;
    min-width: 0;
    min-height: 60px;
}

.continue-info {
    max-width: 100%;
    color: rgba(51, 65, 85, 0.78);
    text-align: center;
    font-size: 12px;
    line-height: 1.45;
    font-weight: 700;
}

.revive-chip {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    min-width: 0;
    min-height: 46px;
    padding: 0 18px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(15, 23, 42, 0.08);
    box-shadow: 0 14px 24px rgba(15, 23, 42, 0.08);
    font-size: 13px;
    white-space: nowrap;
    transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.revive-chip svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
    flex: 0 0 auto;
}

.watch-ad-label {
    display: inline-block;
}

.revive-chip:hover {
    transform: translateY(-1px);
    box-shadow: 0 16px 28px rgba(15, 23, 42, 0.1);
}

.room-hud {
    position: absolute;
    bottom: max(calc(18px * var(--ui-scale)), calc(var(--safe-bottom) + 18px));
    left: max(var(--safe-left), calc(6px * var(--ui-scale)));
    pointer-events: auto;
    width: fit-content;
    min-width: 0;
    max-width: min(calc(100% - 24px), calc(16ch + 14px));
    margin-left: 0;
    margin-right: auto;
    padding: calc(4px * var(--ui-scale)) calc(5px * var(--ui-scale));
    border-radius: calc(13px * var(--ui-scale));
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.14);
    box-shadow: 0 6px 14px rgba(15, 23, 42, 0.025);
    backdrop-filter: blur(4px) saturate(108%);
    -webkit-backdrop-filter: blur(4px) saturate(108%);
    transform-origin: bottom left;
    transition: transform 0.22s ease, box-shadow 0.22s ease, opacity 0.22s ease;
}

.room-hud-body {
    display: grid;
    gap: 4px;
    margin-top: 0;
}

.room-hud-players {
    list-style: none;
    display: grid;
    gap: 2px;
}

.room-hud-players li {
    display: grid;
    grid-template-columns: minmax(0, 12ch) minmax(2ch, max-content);
    align-items: center;
    gap: 3px;
    padding: 0;
}

.room-hud-name {
    min-width: 0;
    max-width: 12ch;
    font-size: calc(11px * var(--ui-scale));
    font-weight: 800;
    color: rgba(15, 23, 42, 0.88);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}


.room-hud-score {
    font-size: calc(11px * var(--ui-scale));
    font-weight: 800;
    color: rgba(37, 99, 235, 0.9);
    min-width: 2ch;
    text-align: right;
}

.room-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.room-btn svg {
    width: 24px;
    height: 24px;
    fill: currentColor;
    flex: 0 0 auto;
}

.home-icon-btn {
    position: absolute;
    top: 0;
    right: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(17, 24, 39, 0.08);
    box-shadow: 0 10px 22px rgba(17, 24, 39, 0.08);
    color: #111827;
}

.home-icon-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.liquid-chip {
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.68);
    background:
        linear-gradient(180deg, rgba(16, 24, 40, 0.92), rgba(15, 23, 42, 0.88)),
        linear-gradient(135deg, rgba(255, 255, 255, 0.22), rgba(255, 255, 255, 0.04));
    box-shadow:
        0 20px 42px rgba(15, 23, 42, 0.24),
        0 1px 0 rgba(255, 255, 255, 0.32) inset,
        0 -10px 24px rgba(15, 23, 42, 0.18) inset;
    backdrop-filter: blur(20px) saturate(150%);
    -webkit-backdrop-filter: blur(20px) saturate(150%);
    color: #ffffff;
    font-size: clamp(18px, 2.8vw, 22px);
    font-weight: 800;
    letter-spacing: -0.02em;
}

#touchControls button::after {
    display: none;
}

#touchControls {
    z-index: 4;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    touch-action: none;
}

#touchControls button {
    position: relative;
    width: 100%;
    height: 100%;
    font-size: 0;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: none;
}

#touchControls button::before {
    content: "";
    position: absolute;
    inset: 0;
    opacity: 0.28;
    transition: opacity 0.16s ease, transform 0.16s ease;
}

#touchControls button::after {
    position: absolute;
    bottom: max(26px, env(safe-area-inset-bottom));
    padding: 12px 16px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.76);
    font-size: 12px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
}

#leftControlBtn::before {
    background:
        radial-gradient(circle at 22% 54%, rgba(31, 41, 55, 0.05), transparent 36%),
        linear-gradient(90deg, rgba(31, 41, 55, 0.04), transparent 74%);
}

#rightControlBtn::before {
    background:
        radial-gradient(circle at 78% 54%, rgba(31, 41, 55, 0.05), transparent 36%),
        linear-gradient(270deg, rgba(31, 41, 55, 0.04), transparent 74%);
}

#leftControlBtn::after {
    content: "←";
    left: 24px;
}

#rightControlBtn::after {
    content: "→";
    right: 24px;
}

#touchControls button:active::before {
    opacity: 0.52;
    transform: scale(0.985);
}


/* ── Room Modal (Popup) ── */

.room-modal {
    z-index: 9;
    display: grid;
    place-items: start center;
    justify-items: center;
    padding:
        max(24svh, calc(var(--safe-top) + 24svh))
        max(16px, var(--safe-right))
        max(16px, var(--safe-bottom))
        max(16px, var(--safe-left));
    background: rgba(15, 23, 42, 0.28);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.room-modal-card {
    position: relative;
    z-index: 1;
    width: min(100%, 420px);
    min-height: 0;
    max-height: min(calc(100svh - 32px - var(--safe-top) - var(--safe-bottom)), 640px);
    max-height: min(calc(100dvh - 32px - var(--safe-top) - var(--safe-bottom)), 640px);
    overflow: auto;
    padding: 24px;
    border-radius: 28px;
    border: 1px solid rgba(255, 255, 255, 0.72);
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(241, 245, 249, 0.96));
    box-shadow: 0 28px 60px rgba(15, 23, 42, 0.28);
    display: grid;
    gap: 18px;
    align-content: start;
}

.room-head-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    min-width: 48px;
    min-height: 48px;
    padding: 0;
    border-radius: 999px;
    background: transparent;
    border: 0;
    box-shadow: none;
}

.room-head-btn svg {
    width: 18px;
    height: 18px;
    fill: currentColor;
    flex: 0 0 auto;
}

.room-exit-btn {
    position: static;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 999px;
    border: 1px solid rgba(17, 24, 39, 0.08);
    background: rgba(255, 255, 255, 0.8);
    color: #111827;
    box-shadow: 0 10px 22px rgba(17, 24, 39, 0.08);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.room-exit-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.room-view {
    display: grid;
    gap: 14px;
}

.room-popup-view {
    display: grid;
    gap: 18px;
}

.room-head-btn:hover,
.room-action-btn:hover {
    box-shadow: none;
}

.room-action-btn {
    min-width: 0;
    width: 100%;
}

.room-action-btn.ghost-btn {
    box-shadow: none;
    background: rgba(226, 232, 255, 0.82);
    border-color: rgba(191, 219, 254, 0.52);
}

.room-action-btn.play-btn {
    box-shadow: none;
}

.room-action-btn.play-btn:hover,
.play-btn:hover {
    box-shadow: none;
}



/* ── Simplified Game Over Screen ── */

.gameover-simple {
    position: relative;
    display: grid;
    gap: 20px;
    width: min(92vw, 340px);
    padding: 0;
    text-align: center;
}

.gameover-simple .home-icon-btn {
    position: absolute;
    top: 0;
    right: 0;
    left: auto;
}

.gameover-scores {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 24px;
    padding: 8px 0;
}

.gameover-score-main,
.gameover-score-best {
    display: grid;
    gap: 4px;
    text-align: center;
}

.gameover-label {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(100, 116, 139, 0.78);
}

.gameover-value {
    font-size: clamp(52px, 14vw, 80px);
    line-height: 0.95;
    font-weight: 900;
    letter-spacing: -0.04em;
    color: rgba(17, 24, 39, 0.82);
}

.gameover-best-value {
    font-size: clamp(28px, 7vw, 40px);
    line-height: 1;
    font-weight: 800;
    color: rgba(37, 99, 235, 0.88);
}

.gameover-actions {
    display: grid;
    gap: 10px;
    width: 100%;
    margin-top: 6px;
    justify-items: center;
}

.gameover-actions .gameover-respawn {
    order: 2;
    margin-top: 0;
    margin-bottom: 0;
    width: 100%;
    max-width: 420px;
}

.gameover-actions .compact-play {
    width: 100%;
    max-width: 420px;
    justify-self: center;
}

#playOnlineDeathBtn {
    order: 1;
}

#retryBtn {
    order: 3;
}

#leaveRoomDeathBtn {
    order: 4;
}

/* ── Room Waiting View ── */

.room-code-section {
    display: grid;
    justify-items: center;
    gap: 8px;
    padding: 0;
}

.room-code-label-sm {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: rgba(100, 116, 139, 0.82);
    margin: 0;
}

.room-code-inline {
    display: flex;
    align-items: center;
    width: 100%;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 14px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid rgba(226, 232, 240, 0.96);
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

.room-code-big {
    flex: 1 1 auto;
    font-size: clamp(26px, 8vw, 36px);
    line-height: 1;
    letter-spacing: 0.14em;
    text-align: left;
    color: #020617;
    font-weight: 900;
}

.room-copy-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 14px;
    background: rgba(226, 232, 255, 0.9);
    border: 1px solid rgba(191, 219, 254, 0.48);
    color: #334155;
    cursor: pointer;
    transition: background 0.16s ease;
}

.room-copy-icon-btn:active {
    background: rgba(191, 219, 254, 0.72);
}

.room-copy-icon-btn svg {
    width: 20px;
    height: 20px;
    fill: currentColor;
}

.room-copy-feedback {
    min-height: 18px;
    font-size: 11px;
    font-weight: 700;
    color: rgba(59, 130, 246, 0.88);
    text-align: center;
}

.room-start-hint {
    min-height: 18px;
    margin: 0;
    font-size: 12px;
    font-weight: 700;
    line-height: 1.35;
    text-align: left;
    color: #dc2626;
}

.room-start-hint.is-hidden {
    display: none;
}

@media (pointer: coarse) {
    .username-input,
    #homeJoinRoomBtn,
    #playOnlineBtn,
    .score-hud,
    .room-hud,
    .liquid-chip {
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
    }
}

.room-join-section {
    display: grid;
    gap: 12px;
}

.room-notice-card {
    display: grid;
    place-items: center;
    min-height: 220px;
    padding: 24px 18px;
    border-radius: 24px;
    border: 1px solid rgba(226, 232, 240, 0.9);
    background: rgba(255, 255, 255, 0.94);
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
}

.room-notice-text {
    margin: 0;
    max-width: 320px;
    font-size: 18px;
    font-weight: 800;
    line-height: 1.45;
    text-align: center;
    color: #dc2626;
}

.room-join-label {
    display: none;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(71, 85, 105, 0.86);
}

.room-join-input {
    width: 100%;
    min-height: 54px;
    padding: 0 18px;
    border-radius: 18px;
    border: 1px solid rgba(226, 232, 240, 0.96);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.08);
    color: #111827;
    font: inherit;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    outline: none;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.room-join-input:focus {
    border-color: rgba(59, 130, 246, 0.42);
    box-shadow: 0 0 0 4px rgba(191, 219, 254, 0.5);
}

.room-join-feedback {
    min-height: 18px;
    font-size: 12px;
    font-weight: 700;
    text-align: center;
    color: #dc2626;
}

.room-join-actions {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 10px;
    align-items: center;
}

.room-join-actions .room-action-btn {
    width: 100%;
    min-width: 0;
}

.room-members-section {
    display: grid;
    gap: 12px;
}

.room-members-header {
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.room-members-count-text {
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: rgba(71, 85, 105, 0.86);
}

.room-members-list {
    list-style: none;
    display: grid;
    gap: 0;
    min-height: 56px;
    max-height: 220px;
    margin: 0;
    padding: 0;
    border-radius: 16px;
    overflow: auto;
    border: 1px solid rgba(226, 232, 240, 0.88);
    background: #ffffff;
    box-shadow: none;
}

.room-member-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    min-height: 52px;
    padding: 0 16px;
}

.room-member-item + .room-member-item {
    border-top: 1px solid rgba(226, 232, 240, 0.72);
}

.room-member-item.is-self {
    background: rgba(248, 250, 252, 0.72);
}

.room-member-item.is-inactive {
    background: rgba(248, 250, 252, 0.72);
}

.room-member-name {
    font-size: 14px;
    font-weight: 700;
    line-height: 1;
    color: #1e293b;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.room-member-item.is-inactive .room-member-name {
    color: rgba(71, 85, 105, 0.62);
}

.room-member-badges {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 0 0 auto;
}

.room-member-host-tag {
    display: inline-flex;
    align-items: center;
    padding: 0;
    border-radius: 0;
    background: transparent;
    color: #b91c1c;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.player-self-suffix {
    color: #15803d;
}

.player-disconnected-suffix {
    color: inherit;
}

.room-member-status-tag {
    display: inline-flex;
    align-items: center;
    padding: 0;
    border-radius: 0;
    background: transparent;
    color: #b91c1c;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.room-actions-row {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    gap: 10px;
    align-items: start;
}

.room-actions-row .room-start-hint {
    grid-column: 1 / -1;
    grid-row: 1;
    text-align: center;
}

.room-actions-row .room-exit-btn {
    grid-column: 1;
    grid-row: 2;
    justify-self: start;
}

.room-actions-row .room-action-btn {
    grid-column: 2;
    grid-row: 2;
    width: 100%;
    min-width: 0;
}

.record-toast {
    position: absolute;
    top: 24px;
    left: 50%;
    z-index: 8;
    padding: calc(10px * var(--ui-scale)) calc(16px * var(--ui-scale));
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.9);
    color: #ecfdf5;
    font-size: calc(12px * var(--ui-scale));
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    transform: translateX(-50%) translateY(-8px);
    opacity: 0;
    transition: opacity 0.22s ease, transform 0.22s ease;
    pointer-events: none;
}

.record-toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.record-toast.checkpoint-toast {
    background: rgba(15, 118, 190, 0.92);
    color: #eff6ff;
}

@media (max-width: 768px) {
    .home-screen {
        padding:
            max(20px, var(--safe-top))
            max(16px, var(--safe-right))
            max(20px, var(--safe-bottom))
            max(16px, var(--safe-left));
    }

    #gameOverScreen {
        padding:
            max(20px, var(--safe-top))
            max(16px, var(--safe-right))
            max(20px, var(--safe-bottom))
            max(16px, var(--safe-left));
        gap: 12px;
    }

    .home-center {
        gap: 16px;
        margin: auto 0;
        padding: 24px 18px;
        border: none;
        background: none;
        box-shadow: none;
    }

    .home-icon-btn {
        width: 42px;
        height: 42px;
    }

    .home-icon-btn svg {
        width: 18px;
        height: 18px;
    }

    .compact-play {
        width: 100%;
        min-height: 56px;
    }


    #hud {
        padding: 0;
    }

    .hud-home-btn {
        top: 16px;
        right: 16px;
        left: auto;
        width: 42px;
        height: 42px;
    }

    .hud-home-btn svg {
        width: 18px;
        height: 18px;
    }

    .room-hud {
        min-width: 0;
        width: fit-content;
        max-width: min(calc(100% - 24px), calc(15ch + 14px));
        padding: 5px;
        border-radius: 13px;
        bottom: max(var(--safe-bottom), 16px);
        left: max(var(--safe-left), 6px);
    }

    .play-btn,
    .compact-play,
    .hero-play {
        width: 100%;
    }

    .home-online-actions {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .home-online-actions .hero-play {
        min-width: 0;
        min-height: 48px;
        padding: 0 14px;
        font-size: 13px;
    }



    .gameover-respawn {
        width: min(100%, 320px);
        padding: 0 6px;
        gap: 8px;
    }

    .continue-info {
        max-width: 100%;
        font-size: 11px;
    }

    .revive-chip {
        min-width: 100%;
        font-size: 12px;
    }

    .room-btn {
        padding-left: 14px;
        padding-right: 14px;
        font-size: 14px;
    }

    .room-modal-card {
        width: min(100%, 360px);
        padding: 20px;
        border-radius: 24px;
    }

    .best-score-hud {
        top: max(16px, calc(var(--safe-top) + 16px));
        left: max(16px, calc(var(--safe-left) + 16px));
        min-height: 36px;
        padding: 8px 16px;
        font-size: clamp(13px, 3.2vw, 16px);
    }

    .score-hud {
        top: max(54px, calc(var(--safe-top) + 54px));
        max-width: calc(100vw - 144px);
        font-size: clamp(46px, 11.4vw, 66px);
    }



    #touchControls button::after {
        bottom: max(18px, var(--safe-bottom));
        padding: 10px 12px;
        font-size: 11px;
        letter-spacing: 0.12em;
    }

    #leftControlBtn::after {
        left: 14px;
    }

    #rightControlBtn::after {
        right: 14px;
    }
}

@media (max-width: 480px) {
    .home-screen,
    #gameOverScreen {
        padding:
            max(14px, var(--safe-top))
            max(12px, var(--safe-right))
            max(14px, var(--safe-bottom))
            max(12px, var(--safe-left));
    }

    .home-center {
        border-radius: 0;
        padding: 18px 14px;
        gap: 14px;
        margin: auto 0;
        border: none;
        background: none;
        box-shadow: none;
    }


    .username-label,
    .room-join-label,
    .room-members-count-text,
    .room-code-label-sm {
        font-size: 11px;
    }

    .username-input,
    .room-join-input {
        min-height: 48px;
        font-size: 16px;
    }

    .home-online-actions {
        gap: 8px;
    }

    .home-online-actions .hero-play {
        min-height: 46px;
        padding: 0 10px;
        font-size: 12px;
    }

    .play-btn,
    .ghost-btn,
    .compact-play {
        min-height: 48px;
        padding-inline: 14px;
    }

    .gameover-simple {
        width: min(100%, 320px);
        gap: 16px;
    }

    .gameover-scores {
        gap: 18px;
    }

    .gameover-value {
        font-size: clamp(44px, 13vw, 64px);
    }

    .gameover-best-value {
        font-size: clamp(24px, 7vw, 32px);
    }

    #hud {
        padding: 0;
    }

    .hud-home-btn {
        top: 12px;
        right: 12px;
        left: auto;
        width: 40px;
        height: 40px;
    }

    .score-hud {
        top: max(48px, calc(var(--safe-top) + 48px));
        max-width: calc(100vw - 124px);
        font-size: clamp(42px, 11.8vw, 58px);
    }

    .best-score-hud {
        top: max(12px, calc(var(--safe-top) + 12px));
        left: max(12px, calc(var(--safe-left) + 12px));
        min-height: 34px;
        padding: 7px 14px;
        font-size: 12px;
    }

    .room-hud {
        bottom: max(var(--safe-bottom), 12px);
        left: max(var(--safe-left), 6px);
        width: fit-content;
        min-width: 0;
        max-width: min(calc(100% - 24px), calc(14ch + 12px));
        padding: 5px;
    }

    .room-hud-name,
    .room-hud-score {
        font-size: 10px;
    }

    .room-modal {
        padding:
            max(20svh, calc(var(--safe-top) + 20svh))
            max(10px, var(--safe-right))
            max(10px, var(--safe-bottom))
            max(10px, var(--safe-left));
    }

    .room-modal-card {
        padding: 18px 14px calc(18px + var(--safe-bottom));
        border-radius: 20px;
    }

    .room-title {
        font-size: clamp(20px, 8vw, 28px);
    }

    .room-code-inline {
        gap: 10px;
        padding: 10px 12px;
    }

    .room-code-big {
        font-size: clamp(20px, 8vw, 26px);
        letter-spacing: 0.1em;
    }

    .room-copy-icon-btn {
        width: 42px;
        height: 42px;
    }

    .room-member-item {
        min-height: 48px;
        padding: 0 12px;
    }

    #touchControls button::after {
        bottom: max(12px, var(--safe-bottom));
        padding: 8px 10px;
        font-size: 10px;
    }

    #leftControlBtn::after {
        left: 10px;
    }

    #rightControlBtn::after {
        right: 10px;
    }
}

@media (max-height: 720px) {
    .home-center,
    .gameover-simple {
        margin-top: max(8px, var(--safe-top));
        margin-bottom: max(8px, var(--safe-bottom));
    }

    .home-center {
        gap: 12px;
        padding-top: 18px;
        padding-bottom: 18px;
        justify-content: center;
    }

}




/* Mobile fullscreen: khi browser vào fullscreen mode, fill toàn màn hình */
:fullscreen #app-shell,
:fullscreen #game-wrapper {
    height: 100vh;
    height: 100svh;
    height: 100dvh;
}

:-webkit-full-screen #app-shell,
:-webkit-full-screen #game-wrapper {
    height: 100vh;
    height: 100svh;
    height: 100dvh;
}

.room-hud-players li.is-inactive {
    opacity: 0.62;
}

.system-popup {
    position: fixed;
    left: 50%;
    bottom: calc(18px + var(--safe-bottom) + 52px);
    transform: translateX(-50%);
    z-index: 10000;
    width: max-content;
    max-width: min(calc(100vw - 24px), 360px);
    pointer-events: none;
}

.system-popup.hidden {
    display: none;
}

.system-popup-card {
    width: auto;
    display: grid;
    align-items: center;
    padding: 8px 12px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.84);
    border: 1px solid rgba(148, 163, 184, 0.22);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.18);
    pointer-events: auto;
}

.system-popup-copy {
    display: grid;
    gap: 1px;
    min-width: 0;
}

.system-popup-title {
    margin: 0;
    font-size: 10px;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    line-height: 1.2;
    color: rgba(191, 219, 254, 0.92);
}

.system-popup-title:empty {
    display: none;
}

.system-popup-text {
    margin: 0;
    font-size: 12px;
    line-height: 1.25;
    color: rgba(248, 250, 252, 0.96);
    overflow: hidden;
    text-overflow: ellipsis;
}

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