.portal-setup-shell,
.portal-intro-shell,
.portal-question-shell,
.portal-result-shell {
    border-radius: 2rem;
    overflow: hidden;
    border: 1px solid #c7d2fe;
    background: linear-gradient(135deg, #eef2ff 0%, #ffffff 45%, #ecfeff 100%);
    box-shadow: 0 24px 48px rgba(15, 23, 42, 0.12);
}

.portal-setup-hero,
.portal-intro-shell {
    display: grid;
    gap: 1.5rem;
}

.portal-setup-hero {
    grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.9fr);
    padding: 1.75rem;
}

.portal-setup-copy h2,
.portal-intro-content h2,
.portal-question-copy h3,
.portal-result-title {
    font-size: clamp(2rem, 4vw, 3rem);
    line-height: 1;
    font-weight: 900;
    color: #111827;
}

.portal-setup-copy p,
.portal-intro-content p,
.portal-result-copy {
    margin-top: 0.9rem;
    color: #475569;
    font-size: 1rem;
    line-height: 1.6;
}

.portal-kicker,
.portal-result-kicker {
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: #4338ca;
}

.portal-choice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
    gap: 1rem;
    padding: 0 1.75rem 1.75rem;
}

.portal-choice-card,
.portal-answer-card {
    text-align: left;
    border-radius: 1.5rem;
    border: 1px solid #cbd5e1;
    background: rgba(255, 255, 255, 0.92);
    padding: 1.1rem 1rem;
    transition: transform 160ms ease, box-shadow 160ms ease, border-color 160ms ease;
}

.portal-choice-card:hover,
.portal-answer-card:hover,
.portal-primary-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 18px 30px rgba(79, 70, 229, 0.14);
    border-color: #818cf8;
}

.portal-choice-card-difficulty {
    min-height: 10.5rem;
}

.portal-choice-title {
    display: block;
    font-size: 1.15rem;
    font-weight: 900;
    color: #0f172a;
}

.portal-choice-meta {
    display: block;
    margin-top: 0.45rem;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #6366f1;
}

.portal-choice-copy {
    display: block;
    margin-top: 0.7rem;
    color: #475569;
    line-height: 1.5;
    font-size: 0.95rem;
}

.portal-setup-stage,
.portal-stage-shell {
    position: relative;
    min-height: 28rem;
    overflow: hidden;
    border-radius: 1.6rem;
    border: 1px solid rgba(255, 255, 255, 0.28);
    background: #0f172a;
}

.portal-stage-background,
.portal-stage-overlay,
.portal-stage-glow,
.portal-stage-portal,
.portal-stage-character,
.portal-stage-speech-bubble,
.portal-stage-hud,
.portal-stage-caption,
.portal-stage-progress {
    position: absolute;
}

.portal-stage-background {
    inset: 0;
    background-size: contain;
    background-position: center bottom;
    background-repeat: no-repeat;
}

.portal-stage-theme-sky { background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: center bottom; }
.portal-stage-theme-park { background-image: linear-gradient(180deg, rgba(16,185,129,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: left bottom; }
.portal-stage-theme-clock { background-image: linear-gradient(180deg, rgba(245,158,11,0.05), rgba(15,23,42,0.14)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: 72% bottom; }
.portal-stage-theme-crystal { background-image: linear-gradient(180deg, rgba(34,211,238,0.05), rgba(15,23,42,0.14)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: 60% center; }
.portal-stage-theme-jungle { background-image: linear-gradient(180deg, rgba(34,197,94,0.05), rgba(15,23,42,0.14)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: 18% center; }
.portal-stage-theme-desert { background-image: linear-gradient(180deg, rgba(251,191,36,0.05), rgba(15,23,42,0.14)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: 82% center; }
.portal-stage-theme-harbour { background-image: linear-gradient(180deg, rgba(56,189,248,0.05), rgba(15,23,42,0.14)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: right bottom; }
.portal-stage-theme-moon { background-image: linear-gradient(180deg, rgba(148,163,184,0.05), rgba(15,23,42,0.16)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: center top; }
.portal-stage-theme-storm { background-image: linear-gradient(180deg, rgba(129,140,248,0.06), rgba(15,23,42,0.16)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: 68% 35%; }
.portal-stage-theme-home { background-image: linear-gradient(180deg, rgba(251,113,133,0.05), rgba(15,23,42,0.14)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png"); background-position: 30% bottom; }

.portal-stage-background-round-2 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_2.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-background-round-3 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_3.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-background-round-4 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_4.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-background-round-5 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_5.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-background-round-6 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_6.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-background-round-7 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_7.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-background-round-8 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_8.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-background-round-9 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_9.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-background-round-10 {
    background-image: linear-gradient(180deg, rgba(59,130,246,0.05), rgba(15,23,42,0.12)), url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/background_image_round_10.png");
    background-position: center bottom;
    background-size: auto, cover;
    background-repeat: no-repeat, no-repeat;
}

.portal-stage-overlay {
    inset: 0;
    background:
        radial-gradient(circle at 15% 18%, rgba(255,255,255,0.08) 0, transparent 18%),
        radial-gradient(circle at 80% 16%, rgba(56,189,248,0.08) 0, transparent 20%),
        linear-gradient(180deg, rgba(15,23,42,0.02) 0%, rgba(15,23,42,0.08) 100%);
}

.portal-stage-glow {
    top: 3rem;
    right: 18%;
    width: 8rem;
    height: 8rem;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/portal.png");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    opacity: 0.42;
    filter: blur(10px) saturate(1.08);
    animation: portalPulse 3.2s ease-in-out infinite;
}

.portal-stage-portal {
    top: auto;
    bottom: 1.4rem;
    right: 16%;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/portal.png");
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    filter: drop-shadow(0 0 0.35rem rgba(56,189,248,0.35)) drop-shadow(0 0 1.8rem rgba(129,140,248,0.55));
    animation: portalPulse 2.4s ease-in-out infinite;
}

.portal-stage-portal-1,
.portal-stage-portal-medium { width: 6.2rem; height: 6.2rem; }
.portal-stage-portal-2 { width: 9.4rem; height: 9.4rem; bottom: 0.8rem; right: 13%; }
.portal-stage-portal-3,
.portal-stage-portal-large { width: 13.2rem; height: 13.2rem; bottom: -0.2rem; right: 9%; }

.portal-stage-character {
    background-position: center bottom;
    background-repeat: no-repeat;
    background-size: contain;
    pointer-events: none;
}

.portal-stage-runner {
    position: absolute;
    background-repeat: no-repeat;
    background-size: contain;
    background-position: center bottom;
    opacity: 0;
    pointer-events: none;
}

.portal-stage-character-ava {
    left: 27%;
    bottom: 0.35rem;
    width: 10.5rem;
    height: 14.5rem;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Ava/Ava_transparent.png");
    z-index: 4;
}

.portal-stage-character-liam {
    left: 31%;
    bottom: 0.25rem;
    width: 8rem;
    height: 12rem;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Liam/Liam_transparent.png");
    z-index: 3;
}

.portal-stage-character-nix {
    left: 47%;
    top: 1rem;
    width: 7rem;
    height: 7rem;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Nix/Nix_flight_transparent.png");
    background-size: 200% 100%;
    animation: nixFly 6s ease-in-out infinite, nixSprite 0.5s steps(1) infinite;
    cursor: pointer;
    z-index: 6;
    pointer-events: auto;
}

.portal-stage-character-nix.is-wrong-flying {
    animation: nixWrongFlight 0.78s ease-in-out forwards, nixSprite 0.18s steps(1) infinite;
}

.portal-stage-character-nix-flying {
    left: 48%;
    top: 1rem;
    width: 6rem;
    height: 6rem;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Nix/Nix_flight_transparent.png");
    background-size: 200% 100%;
    animation: nixFly 6s ease-in-out infinite, nixSprite 0.5s steps(1) infinite;
    z-index: 6;
}

.portal-stage-character-fairy {
    left: 6%;
    top: 1rem;
    width: 7.8rem;
    height: 7.8rem;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/fairy_1.png");
    background-size: contain;
    filter: drop-shadow(0 0 0.45rem rgba(255,255,255,0.35)) drop-shadow(0 0 1.2rem rgba(236,72,153,0.24));
    opacity: 0.95;
    z-index: 5;
    animation: fairyOrbit 9s ease-in-out infinite;
}

.portal-stage-character-fish {
    width: 4.6rem;
    height: 4.6rem;
    background-size: contain;
    filter: drop-shadow(0 0 0.35rem rgba(255,255,255,0.22));
    opacity: 0.96;
    z-index: 4;
}

.portal-stage-character-fish-orange {
    right: -8%;
    top: 32%;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/orange_fish.png");
    animation: fishSwimOrange 6.2s linear infinite;
}

.portal-stage-character-fish-blue {
    left: -8%;
    top: 56%;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Blue_fish.png");
    animation: fishSwimBlue 5.6s linear infinite;
}

.portal-stage-character-crab {
    width: 6.2rem;
    height: 6.2rem;
    bottom: 2.6rem;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    filter: drop-shadow(0 0 0.28rem rgba(15,23,42,0.2));
    opacity: 0.98;
    z-index: 7;
}

.portal-stage-character-crab-a {
    left: 33%;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/crab_1.png");
    animation: crabScuttleA 4.4s ease-in-out infinite;
}

.portal-stage-character-crab-b {
    left: 47%;
    width: 5.8rem;
    height: 5.8rem;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/crab_2.png");
    animation: crabScuttleB 4s ease-in-out infinite;
    animation-delay: -1.6s;
}

.portal-stage-character-seagull {
    width: 5.4rem;
    height: 5.4rem;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/seagull.png");
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    filter: drop-shadow(0 0 0.35rem rgba(255,255,255,0.28));
    opacity: 0.98;
    z-index: 5;
}

.portal-stage-character-seagull-a {
    right: -10%;
    left: auto;
    top: 12%;
    animation: seagullGlideA 7.2s linear infinite;
}

.portal-stage-character-seagull-b {
    right: -12%;
    left: auto;
    top: 28%;
    width: 4.8rem;
    height: 4.8rem;
    animation: seagullGlideB 6.1s linear infinite;
    animation-delay: -2.2s;
}

.portal-stage-character-seagull-c {
    right: -14%;
    left: auto;
    top: 6%;
    width: 6rem;
    height: 6rem;
    animation: seagullGlideC 8s linear infinite;
    animation-delay: -4.1s;
}

.portal-stage-runner-ava {
    left: 27%;
    bottom: -0.9rem;
    width: 10.5rem;
    height: 14.5rem;
    z-index: 4;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Ava/ava_run_1.png");
}

.portal-stage-runner-liam {
    left: 31%;
    bottom: -1rem;
    width: 10.8rem;
    height: 15.8rem;
    z-index: 3;
    background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Liam/liam_run_1.png");
}

.portal-stage-speech-bubble {
    top: 2rem;
    right: 2rem;
    left: auto;
    z-index: 5;
    max-width: 12.5rem;
    padding: 0.7rem 0.8rem;
    border-radius: 1.1rem;
    background: rgba(255, 255, 255, 0.96);
    border: 1px solid rgba(191, 219, 254, 0.9);
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.16);
    color: #0f172a;
}

.portal-stage-speech-bubble.is-hidden,
.portal-stage-speech-question.is-hidden,
.portal-answer-grid.is-hidden,
.portal-stage-nix-prompt.is-hidden {
    display: none;
}

.portal-stage-speech-bubble::after {
    content: "";
    position: absolute;
    top: 100%;
    right: 1.7rem;
    width: 0.95rem;
    height: 0.95rem;
    background: rgba(255, 255, 255, 0.96);
    border-right: 1px solid rgba(191, 219, 254, 0.9);
    border-bottom: 1px solid rgba(191, 219, 254, 0.9);
    transform: rotate(45deg);
}

.portal-stage-speech-kicker {
    font-size: 0.6rem;
    font-weight: 900;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: #7c3aed;
}

.portal-stage-speech-line {
    margin-top: 0.25rem;
    font-size: 0.76rem;
    line-height: 1.3;
    color: #334155;
}

.portal-stage-speech-question {
    margin-top: 0.35rem;
    font-size: 1.15rem;
    line-height: 1.1;
    font-weight: 900;
    color: #111827;
}

.portal-stage-nix-prompt {
    position: absolute;
    top: 6rem;
    left: 49%;
    z-index: 5;
    padding: 0.55rem 0.9rem;
    border-radius: 999px;
    border: 1px solid rgba(191, 219, 254, 0.9);
    background: rgba(15, 23, 42, 0.78);
    color: white;
    font-size: 0.76rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    box-shadow: 0 12px 24px rgba(15, 23, 42, 0.18);
}

.portal-stage-nix-prompt.is-secondary {
    background: rgba(67, 56, 202, 0.86);
}

.portal-stage-hud {
    top: 1rem;
    left: 1rem;
    right: 1rem;
    display: flex;
    justify-content: space-between;
    gap: 0.8rem;
    z-index: 2;
}

.portal-stage-badge {
    display: grid;
    gap: 0.1rem;
    padding: 0.55rem 0.9rem;
    border-radius: 1rem;
    background: rgba(15, 23, 42, 0.52);
    color: white;
    backdrop-filter: blur(6px);
}

.portal-stage-badge span {
    font-size: 0.66rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #bfdbfe;
}

.portal-stage-badge strong {
    font-size: 1rem;
    font-weight: 900;
}

.portal-stage-progress {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    height: 0.65rem;
    border-radius: 999px;
    background: rgba(255,255,255,0.16);
    overflow: hidden;
}

.portal-stage-progress-fill {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #22d3ee 0%, #818cf8 45%, #c084fc 100%);
}

.portal-stage-danger .portal-stage-portal {
    filter: drop-shadow(0 0 0.55rem rgba(254, 202, 202, 0.44)) drop-shadow(0 0 2.4rem rgba(239, 68, 68, 0.62)) hue-rotate(-20deg) saturate(1.15);
}

.portal-stage-success .portal-stage-portal {
    filter: drop-shadow(0 0 0.5rem rgba(167, 243, 208, 0.42)) drop-shadow(0 0 2.2rem rgba(16, 185, 129, 0.58)) hue-rotate(18deg) saturate(1.1);
}

.portal-stage-caption {
    left: 1rem;
    bottom: 2rem;
    max-width: 22rem;
    z-index: 2;
    color: #e2e8f0;
    font-size: 0.95rem;
}

.portal-question-shell {
    margin-top: 1.5rem;
    padding: 1.5rem;
}

.portal-helper-text {
    margin-top: 0.8rem;
    color: #475569;
    font-size: 0.98rem;
}

.portal-answer-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.9rem;
    margin-top: 1.35rem;
}

.portal-answer-card {
    font-size: 1.05rem;
    font-weight: 800;
    color: #111827;
}

.portal-answer-card.is-selected {
    border-color: #4f46e5;
    background: #eef2ff;
}

.portal-answer-card.is-correct {
    border-color: #10b981;
    background: #ecfdf5;
}

.portal-answer-grid.is-disabled {
    pointer-events: none;
    opacity: 0.88;
}

.portal-answer-card.is-wrong {
    border-color: #ef4444;
    background: #fef2f2;
    animation: portalShake 260ms ease-in-out;
}

.portal-stage-transitioning .portal-stage-portal {
    animation: portalSeal 2.35s ease-in forwards;
}

.portal-stage-transitioning .portal-stage-character-nix {
    animation: nixFlyIntoPortal 2.35s ease-in forwards, nixSprite 0.22s steps(1) infinite;
}

.portal-intro-shell {
    grid-template-columns: minmax(17rem, 0.95fr) minmax(0, 1.05fr);
    padding: 1.75rem;
}

.portal-intro-content {
    align-self: center;
}

.portal-intro-steps {
    margin-top: 1.2rem;
    display: grid;
    gap: 0.7rem;
    color: #334155;
    font-weight: 600;
}

.portal-intro-badges {
    margin-top: 1.3rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
}

.portal-intro-badges span {
    padding: 0.55rem 0.85rem;
    border-radius: 999px;
    background: #e0e7ff;
    color: #3730a3;
    font-size: 0.84rem;
    font-weight: 800;
}

.portal-primary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 12rem;
    border-radius: 999px;
    border: 1px solid #4f46e5;
    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    padding: 0.95rem 1.4rem;
    font-weight: 800;
}

.portal-result-shell {
    padding: 1.75rem;
}

.portal-result-shell-fail {
    border-color: #fecaca;
    background: linear-gradient(135deg, #fff1f2 0%, #ffffff 44%, #fff7ed 100%);
    animation: portalFailureScreen 0.72s ease-out both;
}

.portal-result-card {
    max-width: 42rem;
    margin: 0 auto;
    text-align: center;
}

.portal-result-card-fail {
    max-width: 100%;
}

.portal-fail-stage {
    position: relative;
    width: 100%;
    height: min(62vh, 28rem);
    min-height: 18rem;
    margin: 0 auto 1.6rem;
    overflow: hidden;
    border-radius: 1.8rem;
    border: 1px solid rgba(252, 165, 165, 0.42);
    box-shadow: 0 24px 60px rgba(127, 29, 29, 0.16);
    background:
        radial-gradient(circle at 50% 42%, rgba(255,255,255,0.88) 0, rgba(255,255,255,0.1) 12%, transparent 28%),
        linear-gradient(180deg, rgba(15,23,42,0.05) 0%, rgba(127,29,29,0.16) 100%),
        url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/city_park_background.png");
    background-position: center, center, center bottom;
    background-repeat: no-repeat, no-repeat, no-repeat;
    background-size: auto, auto, cover;
}

.portal-fail-flash,
.portal-fail-portal,
.portal-fail-shockwave,
.portal-fail-smoke,
.portal-fail-spark {
    position: absolute;
}

.portal-fail-portal {
    left: 50%;
    top: 54%;
    width: min(38vw, 15rem);
    height: min(38vw, 15rem);
    transform: translate(-50%, -50%);
    background: url("/static/quizzes/game_assets/Portal_panic/assets/backgrounds/portal.png") center/contain no-repeat;
    filter: drop-shadow(0 0 0.5rem rgba(125,211,252,0.55)) drop-shadow(0 0 2rem rgba(239,68,68,0.4));
    animation: portalFailureBurst 0.95s ease-out forwards;
}

.portal-fail-flash {
    inset: 0;
    background: radial-gradient(circle at 50% 45%, rgba(255,255,255,0.98) 0, rgba(255,255,255,0.82) 10%, rgba(254,226,226,0.2) 28%, transparent 52%);
    opacity: 0;
    animation: portalFailureFlash 0.7s ease-out forwards;
}

.portal-fail-shockwave {
    left: 50%;
    top: 50%;
    width: 2rem;
    height: 2rem;
    border-radius: 999px;
    border: 0.35rem solid rgba(248,113,113,0.85);
    transform: translate(-50%, -50%);
    opacity: 0;
    animation: portalFailureShockwave 0.95s ease-out forwards;
}

.portal-fail-smoke {
    bottom: 1.8rem;
    width: 9rem;
    height: 5.5rem;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(148,163,184,0.52) 0, rgba(148,163,184,0.24) 38%, transparent 72%);
    filter: blur(5px);
    opacity: 0;
}

.portal-fail-smoke-a {
    left: 24%;
    animation: portalFailureSmokeA 1.2s ease-out 0.18s forwards;
}

.portal-fail-smoke-b {
    right: 21%;
    animation: portalFailureSmokeB 1.25s ease-out 0.12s forwards;
}

.portal-fail-spark {
    left: 50%;
    top: 54%;
    width: 0.75rem;
    height: 3.2rem;
    border-radius: 999px;
    background: linear-gradient(180deg, rgba(255,255,255,0.95) 0%, rgba(250,204,21,0.95) 50%, rgba(239,68,68,0) 100%);
    transform-origin: center top;
    opacity: 0;
}

.portal-fail-spark-a {
    animation: portalFailureSparkA 0.9s ease-out 0.08s forwards;
}

.portal-fail-spark-b {
    animation: portalFailureSparkB 0.95s ease-out 0.04s forwards;
}

.portal-fail-spark-c {
    animation: portalFailureSparkC 0.88s ease-out 0.1s forwards;
}

.portal-result-metrics {
    margin-top: 1.5rem;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.85rem;
}

.portal-result-metrics div {
    padding: 1rem;
    border-radius: 1.2rem;
    background: rgba(255,255,255,0.9);
    border: 1px solid #e2e8f0;
}

.portal-result-metrics span {
    display: block;
    font-size: 0.72rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #64748b;
}

.portal-result-metrics strong {
    display: block;
    margin-top: 0.4rem;
    font-size: 1.15rem;
    font-weight: 900;
    color: #111827;
}

@keyframes helperRun {
    0%, 100% { transform: translateX(0) translateY(0); }
    50% { transform: translateX(14px) translateY(-6px); }
}

@keyframes nixFly {
    0%, 100% { transform: translate(0, 0) rotate(-6deg); }
    35% { transform: translate(14px, -10px) rotate(3deg); }
    70% { transform: translate(-10px, 8px) rotate(-10deg); }
}

@keyframes nixSprite {
    0%, 49.99% { background-position: 0% 0%; }
    50%, 100% { background-position: 100% 0%; }
}

@keyframes nixWrongFlight {
    0% {
        transform: translate(0, 0) rotate(-6deg);
    }
    20% {
        transform: translate(-3.5rem, -0.8rem) rotate(-14deg);
    }
    48% {
        transform: translate(5.5rem, -1.4rem) rotate(10deg);
    }
    72% {
        transform: translate(-2rem, -0.55rem) rotate(-10deg);
    }
    100% {
        transform: translate(0, 0) rotate(-6deg);
    }
}

@keyframes fairyOrbit {
    0% {
        transform: translate(0, 0) scale(0.9) rotate(-6deg);
    }
    14% {
        transform: translate(12rem, -0.8rem) scale(0.96) rotate(4deg);
    }
    28% {
        transform: translate(24rem, 1.1rem) scale(0.92) rotate(8deg);
    }
    42% {
        transform: translate(33rem, 4.4rem) scale(1) rotate(-3deg);
    }
    58% {
        transform: translate(22rem, 8rem) scale(0.94) rotate(-10deg);
    }
    74% {
        transform: translate(8rem, 6.4rem) scale(0.9) rotate(7deg);
    }
    88% {
        transform: translate(18rem, 2.6rem) scale(0.96) rotate(-5deg);
    }
    100% {
        transform: translate(0, 0) scale(0.9) rotate(-6deg);
    }
}

@keyframes fishSwimOrange {
    0% {
        transform: translate(0, 0) scaleX(1) rotate(-4deg);
    }
    22% {
        transform: translate(-16rem, -1.2rem) scaleX(1) rotate(4deg);
    }
    48% {
        transform: translate(-33rem, 1rem) scaleX(1) rotate(-2deg);
    }
    74% {
        transform: translate(-46rem, -0.8rem) scaleX(1) rotate(3deg);
    }
    100% {
        transform: translate(-60rem, 0.3rem) scaleX(1) rotate(-4deg);
    }
}

@keyframes fishSwimBlue {
    0% {
        transform: translate(0, 0) scaleX(-1) rotate(3deg);
    }
    26% {
        transform: translate(14rem, -1rem) scaleX(-1) rotate(-5deg);
    }
    52% {
        transform: translate(31rem, 0.8rem) scaleX(-1) rotate(4deg);
    }
    78% {
        transform: translate(44rem, -1.2rem) scaleX(-1) rotate(-3deg);
    }
    100% {
        transform: translate(58rem, 0.2rem) scaleX(-1) rotate(3deg);
    }
}

@keyframes crabScuttleA {
    0% {
        transform: translate(0, 0);
    }
    25% {
        transform: translate(1.2rem, -0.12rem);
    }
    50% {
        transform: translate(2.4rem, 0.05rem);
    }
    75% {
        transform: translate(3.6rem, -0.08rem);
    }
    100% {
        transform: translate(4.8rem, 0);
    }
}

@keyframes crabScuttleB {
    0% {
        transform: translate(0, 0);
    }
    30% {
        transform: translate(1.4rem, -0.14rem);
    }
    55% {
        transform: translate(2.8rem, 0.08rem);
    }
    80% {
        transform: translate(4.1rem, -0.1rem);
    }
    100% {
        transform: translate(5.2rem, 0);
    }
}

@keyframes seagullGlideA {
    0% {
        transform: translate(0, 0) scaleX(-1) rotate(-3deg);
    }
    25% {
        transform: translate(-18rem, 0.8rem) scaleX(-1) rotate(2deg);
    }
    55% {
        transform: translate(-38rem, -0.6rem) scaleX(-1) rotate(-1deg);
    }
    100% {
        transform: translate(-68rem, 1rem) scaleX(-1) rotate(3deg);
    }
}

@keyframes seagullGlideB {
    0% {
        transform: translate(0, 0) scaleX(-1) rotate(2deg);
    }
    30% {
        transform: translate(-22rem, -1rem) scaleX(-1) rotate(-3deg);
    }
    62% {
        transform: translate(-44rem, 0.5rem) scaleX(-1) rotate(2deg);
    }
    100% {
        transform: translate(-70rem, -0.8rem) scaleX(-1) rotate(-2deg);
    }
}

@keyframes seagullGlideC {
    0% {
        transform: translate(0, 0) scaleX(-1) rotate(-2deg);
    }
    18% {
        transform: translate(-14rem, 0.7rem) scaleX(-1) rotate(3deg);
    }
    48% {
        transform: translate(-34rem, -0.9rem) scaleX(-1) rotate(-2deg);
    }
    76% {
        transform: translate(-52rem, 0.4rem) scaleX(-1) rotate(2deg);
    }
    100% {
        transform: translate(-72rem, -0.5rem) scaleX(-1) rotate(-3deg);
    }
}

@keyframes avaRunnerFrames {
    0%, 49.99% {
        background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Ava/ava_run_1.png");
    }
    50%, 100% {
        background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Ava/ava_run_2.png");
    }
}

@keyframes liamRunnerFrames {
    0%, 49.99% {
        background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Liam/liam_run_1.png");
    }
    50%, 100% {
        background-image: url("/static/quizzes/game_assets/Portal_panic/assets/characters/Liam/liam_run_2.png");
    }
}

@keyframes portalPulse {
    0%, 100% { transform: scale(1); opacity: 0.92; }
    50% { transform: scale(1.08); opacity: 1; }
}

@keyframes avaStandExit {
    0%, 18% {
        opacity: 1;
        transform: translate(0, 0) scale(1);
    }
    24%, 100% {
        opacity: 0;
        transform: translate(0, 0) scale(1);
    }
}

@keyframes liamStandExit {
    0%, 14% {
        opacity: 1;
        transform: translate(0, 0) scale(1);
    }
    20%, 100% {
        opacity: 0;
        transform: translate(0, 0) scale(1);
    }
}

@keyframes avaRunToPortal {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 0;
        background-position: 0% 0%;
    }
    18% {
        opacity: 0;
        transform: translate(0, 0) scale(1);
    }
    24% {
        opacity: 1;
        transform: translate(0, 0) scale(1);
    }
    30% {
        background-position: 0% 0%;
    }
    42% {
        background-position: 50% 0%;
    }
    54% {
        background-position: 100% 0%;
    }
    66% {
        background-position: 0% 0%;
    }
    58% {
        transform: translate(3.6rem, 0) scale(0.99);
        opacity: 1;
        background-position: 50% 0%;
    }
    68% {
        background-position: 100% 0%;
    }
    78% {
        transform: translate(9rem, 0) scale(0.97);
        opacity: 1;
        background-position: 0% 0%;
    }
    88% {
        transform: translate(15rem, -1.4rem) scale(0.78);
        background-position: 50% 0%;
    }
    100% {
        transform: translate(18rem, -0.6rem) scale(0.32);
        opacity: 0;
        background-position: 100% 0%;
    }
}

@keyframes liamRunToPortal {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 0;
        background-position: 0% 0%;
    }
    14% {
        opacity: 0;
        transform: translate(0, 0) scale(1);
    }
    20% {
        opacity: 1;
        transform: translate(0, 0) scale(1);
    }
    26% {
        background-position: 50% 0%;
    }
    38% {
        background-position: 100% 0%;
    }
    50% {
        background-position: 0% 0%;
    }
    52% {
        transform: translate(5.2rem, 0) scale(0.99);
        opacity: 1;
        background-position: 50% 0%;
    }
    64% {
        background-position: 100% 0%;
    }
    78% {
        transform: translate(11rem, 0) scale(0.96);
        opacity: 1;
        background-position: 0% 0%;
    }
    88% {
        transform: translate(17rem, -1.2rem) scale(0.72);
        background-position: 50% 0%;
    }
    100% {
        transform: translate(20rem, -0.45rem) scale(0.3);
        opacity: 0;
        background-position: 100% 0%;
    }
}

@keyframes portalSeal {
    0% {
        transform: scale(1);
        opacity: 0.95;
    }
    30% {
        transform: scale(1.14);
        opacity: 1;
    }
    70% {
        transform: scale(0.66);
        opacity: 0.92;
    }
    100% {
        transform: scale(0.16);
        opacity: 0;
    }
}

@keyframes nixFlyIntoPortal {
    0% {
        transform: translate(0, 0) rotate(-6deg) scale(1);
        opacity: 1;
    }
    24% {
        transform: translate(-3rem, -0.4rem) rotate(-14deg) scale(1.02);
        opacity: 1;
    }
    48% {
        transform: translate(2rem, 0.2rem) rotate(8deg) scale(0.96);
        opacity: 1;
    }
    72% {
        transform: translate(8.5rem, 1.8rem) rotate(4deg) scale(0.72);
        opacity: 1;
    }
    100% {
        transform: translate(13.5rem, 3.2rem) rotate(0deg) scale(0.12);
        opacity: 0;
    }
}

@keyframes portalShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    50% { transform: translateX(5px); }
    75% { transform: translateX(-3px); }
}

@keyframes portalFailureScreen {
    0% { transform: scale(0.985); filter: brightness(1.18); }
    18% { transform: translateX(-10px) scale(1.012); }
    34% { transform: translateX(10px) scale(1.01); }
    52% { transform: translateX(-6px) scale(1.005); }
    70% { transform: translateX(5px) scale(1); }
    100% { transform: translateX(0) scale(1); filter: brightness(1); }
}

@keyframes portalFailureFlash {
    0% { opacity: 0; }
    18% { opacity: 1; }
    55% { opacity: 0.5; }
    100% { opacity: 0; }
}

@keyframes portalFailureBurst {
    0% { transform: translate(-50%, -50%) scale(1); opacity: 1; }
    24% { transform: translate(-50%, -50%) scale(1.22); opacity: 1; }
    58% { transform: translate(-50%, -50%) scale(0.78) rotate(9deg); opacity: 0.82; }
    100% { transform: translate(-50%, -50%) scale(0.22) rotate(18deg); opacity: 0; }
}

@keyframes portalFailureShockwave {
    0% { width: 2rem; height: 2rem; opacity: 0.88; }
    100% { width: 18rem; height: 18rem; opacity: 0; }
}

@keyframes portalFailureSmokeA {
    0% { transform: translate(0, 0) scale(0.6); opacity: 0.15; }
    100% { transform: translate(-1.6rem, -2.6rem) scale(1.25); opacity: 0; }
}

@keyframes portalFailureSmokeB {
    0% { transform: translate(0, 0) scale(0.58); opacity: 0.18; }
    100% { transform: translate(1.8rem, -2.2rem) scale(1.2); opacity: 0; }
}

@keyframes portalFailureSparkA {
    0% { transform: translate(-50%, -50%) rotate(-18deg) scaleY(0.6); opacity: 0.95; }
    100% { transform: translate(-7rem, -5rem) rotate(-55deg) scaleY(1.15); opacity: 0; }
}

@keyframes portalFailureSparkB {
    0% { transform: translate(-50%, -50%) rotate(8deg) scaleY(0.7); opacity: 0.95; }
    100% { transform: translate(0.6rem, -6.2rem) rotate(6deg) scaleY(1.18); opacity: 0; }
}

@keyframes portalFailureSparkC {
    0% { transform: translate(-50%, -50%) rotate(22deg) scaleY(0.65); opacity: 0.95; }
    100% { transform: translate(7rem, -4.8rem) rotate(58deg) scaleY(1.12); opacity: 0; }
}

@media (max-width: 900px) {
    .portal-setup-hero,
    .portal-intro-shell {
        grid-template-columns: 1fr;
    }

    .portal-answer-grid,
    .portal-result-metrics {
        grid-template-columns: 1fr;
    }

    .portal-stage-character-ava,
    .portal-stage-character-liam,
    .portal-stage-runner-ava,
    .portal-stage-runner-liam {
        width: 8.3rem;
        height: 12.6rem;
    }

    .portal-stage-character-ava,
    .portal-stage-runner-ava {
        left: 24%;
        width: 7.6rem;
        height: 11rem;
    }

    .portal-stage-character-liam,
    .portal-stage-runner-liam {
        left: 30%;
    }

    .portal-stage-runner-liam {
        width: 6.2rem;
        height: 9.5rem;
    }

    .portal-stage-speech-bubble {
        top: 1.2rem;
        right: 1rem;
        left: auto;
        max-width: 10rem;
        padding: 0.65rem 0.75rem;
    }

    .portal-stage-speech-question {
        font-size: 1rem;
    }

    .portal-stage-nix-prompt {
        top: 5.2rem;
        left: 44%;
        padding: 0.5rem 0.75rem;
        font-size: 0.68rem;
    }
}