:root {
    --def-bg: #05070d;
    --def-panel: rgba(10, 14, 24, 0.96);
    --def-panel-soft: rgba(17, 23, 36, 0.94);
    --def-paper: #f7f4ec;
    --def-muted: rgba(247, 244, 236, 0.67);
    --def-cyan: #45dcff;
    --def-lime: #a7ef5c;
    --def-yellow: #ffd34e;
    --def-red: #ff5475;
    --def-violet: #9d7bff;
    --def-line: rgba(255, 255, 255, 0.14);
}

.byte-defender-page {
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--def-paper);
    background:
        radial-gradient(circle at 18% 8%, rgba(69, 220, 255, 0.12), transparent 28rem),
        radial-gradient(circle at 82% 12%, rgba(157, 123, 255, 0.11), transparent 26rem),
        linear-gradient(180deg, #070a11 0%, #03050a 62%, #090b11 100%);
}

.byte-defender-page::before {
    position: fixed;
    inset: 0;
    z-index: -1;
    content: "";
    opacity: 0.3;
    background-image:
        radial-gradient(circle, rgba(255, 255, 255, 0.22) 0 1px, transparent 1.3px),
        radial-gradient(circle, rgba(69, 220, 255, 0.18) 0 1px, transparent 1.4px);
    background-position: 0 0, 33px 37px;
    background-size: 74px 74px, 97px 97px;
    mask-image: linear-gradient(to bottom, #000, transparent 78%);
}

.defender-shell {
    width: min(calc(100% - 2rem), 1160px);
    display: grid;
    grid-template-columns: minmax(0, 1fr) 294px;
    gap: 1rem;
    align-items: start;
    margin: 0 auto;
    padding: 7rem 0 3rem;
}

.defender-game-panel,
.defender-side-panel,
.defender-wave-grid article,
.defender-design-note {
    border: 1px solid var(--def-line);
    border-radius: 8px;
    background: var(--def-panel);
    box-shadow: 0 24px 76px rgba(0, 0, 0, 0.36);
}

.defender-game-panel {
    min-width: 0;
    overflow: hidden;
}

.defender-game-head {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 1rem;
    align-items: start;
    min-height: 8.35rem;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--def-line);
    background:
        linear-gradient(118deg, rgba(69, 220, 255, 0.13), transparent 40%),
        linear-gradient(300deg, rgba(167, 239, 92, 0.08), transparent 36%),
        rgba(255, 255, 255, 0.025);
}

.defender-title {
    min-width: 0;
}

.defender-title .section-kicker {
    color: var(--def-lime);
}

.defender-title h1 {
    margin: 0.08rem 0 0;
    color: var(--def-paper);
    font: 950 clamp(2rem, 3.6vw, 3.3rem)/0.94 "Arial Black", "Microsoft YaHei", sans-serif;
    letter-spacing: -0.045em;
}

.defender-title h1 span {
    color: var(--def-yellow);
    text-shadow: 0 0 24px rgba(255, 211, 78, 0.2);
}

.defender-title > p:last-child {
    max-width: 46rem;
    margin: 0.45rem 0 0;
    color: rgba(247, 244, 236, 0.77);
    font-size: 0.88rem;
    line-height: 1.5;
}

.defender-actions {
    width: 16.8rem;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
}

.defender-actions .btn {
    min-width: 0;
    min-height: 2.7rem;
    justify-content: center;
    padding: 0.5rem 0.6rem;
    font-size: 0.82rem;
}

.defender-actions svg,
.battle-result svg {
    width: 1rem;
    height: 1rem;
}

.defender-stage {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    min-height: 22rem;
    overflow: hidden;
    background: #03050a;
    box-shadow: inset 0 0 80px rgba(69, 220, 255, 0.08);
}

#java-byte-defender,
#java-byte-defender canvas {
    width: 100%;
    height: 100%;
    display: block;
    touch-action: none;
}

#java-byte-defender canvas {
    image-rendering: pixelated;
}

.defender-loading,
.compile-modal,
.battle-result {
    position: absolute;
    inset: 0;
    z-index: 10;
}

.defender-loading {
    display: grid;
    place-content: center;
    justify-items: center;
    gap: 0.25rem;
    color: var(--def-paper);
    text-align: center;
    background:
        radial-gradient(circle, rgba(69, 220, 255, 0.16), transparent 15rem),
        rgba(3, 5, 10, 0.97);
    transition: opacity 220ms ease;
}

.defender-loading.is-hidden {
    pointer-events: none;
    opacity: 0;
}

.loading-reticle {
    width: 4.6rem;
    height: 4.6rem;
    position: relative;
    display: grid;
    place-items: center;
    margin-bottom: 0.75rem;
    border: 1px solid rgba(69, 220, 255, 0.52);
    border-radius: 50%;
    color: var(--def-cyan);
    box-shadow: 0 0 36px rgba(69, 220, 255, 0.18);
    animation: target-spin 3s linear infinite;
}

.loading-reticle::before,
.loading-reticle::after {
    position: absolute;
    content: "";
    background: var(--def-cyan);
    opacity: 0.6;
}

.loading-reticle::before { width: 5.4rem; height: 1px; }
.loading-reticle::after { width: 1px; height: 5.4rem; }

.loading-reticle span {
    font: 900 1rem/1 Consolas, monospace;
}

.defender-loading small {
    color: var(--def-muted);
}

.compile-modal,
.battle-result {
    display: grid;
    place-items: center;
    padding: clamp(0.55rem, 2vw, 1.2rem);
    background: rgba(2, 4, 9, 0.76);
    backdrop-filter: blur(8px);
}

.compile-modal[hidden],
.battle-result[hidden] {
    display: none;
}

.compile-card,
.battle-result-card {
    width: min(43rem, 100%);
    max-height: 100%;
    overflow: auto;
    border: 1px solid rgba(69, 220, 255, 0.38);
    border-radius: 8px;
    color: var(--def-paper);
    background: #0d131e;
    box-shadow: 0 28px 90px rgba(0, 0, 0, 0.62), 0 0 50px rgba(69, 220, 255, 0.11);
}

.compile-card {
    padding: clamp(0.8rem, 2vw, 1.15rem);
}

.compile-card-top {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.compile-card-top .section-kicker {
    color: var(--def-lime);
}

.compile-card-top h2 {
    margin: 0.12rem 0 0;
    font-size: clamp(1.35rem, 3.4vw, 1.95rem);
    line-height: 1.12;
}

.compile-status {
    flex: 0 0 auto;
    padding: 0.35rem 0.5rem;
    border: 1px solid rgba(255, 211, 78, 0.35);
    border-radius: 4px;
    color: var(--def-yellow);
    background: rgba(255, 211, 78, 0.08);
    font: 900 0.64rem/1 Consolas, monospace;
}

.compile-story,
.compile-prompt {
    margin: 0.65rem 0 0;
    color: rgba(247, 244, 236, 0.78);
}

.compile-prompt {
    font-weight: 800;
}

.code-editor {
    overflow: hidden;
    margin-top: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.13);
    border-radius: 6px;
    background: #03060b;
}

.code-editor-bar {
    min-height: 2rem;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0 0.7rem;
    color: rgba(247, 244, 236, 0.58);
    border-bottom: 1px solid rgba(255, 255, 255, 0.09);
    background: rgba(255, 255, 255, 0.035);
    font: 700 0.7rem/1 Consolas, monospace;
}

.code-editor-bar span {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    background: var(--def-red);
}

.code-editor-bar span:nth-child(2) { background: var(--def-yellow); }
.code-editor-bar span:nth-child(3) { margin-right: 0.25rem; background: var(--def-lime); }

.code-editor pre {
    min-height: 5.5rem;
    display: grid;
    align-items: center;
    margin: 0;
    padding: 0.8rem 1rem;
    overflow: auto;
    color: #dce8f7;
    font: 700 clamp(0.7rem, 1.5vw, 0.9rem)/1.55 Consolas, "Courier New", monospace;
    white-space: pre-wrap;
}

.code-editor code { color: inherit; }

.compile-answers {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
    margin-top: 0.7rem;
}

.compile-answer {
    min-width: 0;
    min-height: 3rem;
    padding: 0.6rem 0.7rem;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    color: #e8f4ff;
    text-align: left;
    background: rgba(255, 255, 255, 0.045);
    cursor: pointer;
    transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
    font: 700 clamp(0.68rem, 1.4vw, 0.84rem)/1.35 Consolas, monospace;
}

.compile-answer:hover,
.compile-answer:focus-visible {
    transform: translateY(-1px);
    border-color: var(--def-cyan);
    background: rgba(69, 220, 255, 0.1);
    outline: none;
}

.compile-answer.is-wrong {
    border-color: var(--def-red);
    background: rgba(255, 84, 117, 0.15);
}

.compile-answer.is-correct {
    border-color: var(--def-lime);
    color: #efffdf;
    background: rgba(167, 239, 92, 0.16);
}

.compile-answer:disabled { cursor: default; }

.compile-feedback {
    display: none;
    margin-top: 0.65rem;
    padding: 0.65rem 0.75rem;
    border-left: 3px solid var(--def-cyan);
    border-radius: 4px;
    color: rgba(247, 244, 236, 0.86);
    background: rgba(69, 220, 255, 0.08);
}

.compile-feedback.is-visible { display: block; }
.compile-feedback.is-error { border-color: var(--def-red); background: rgba(255, 84, 117, 0.09); }

.battle-result-card {
    max-width: 29rem;
    padding: 1.4rem;
    text-align: center;
}

.result-emblem {
    width: 4.2rem;
    height: 4.2rem;
    display: grid;
    place-items: center;
    margin: 0 auto 0.8rem;
    border: 1px solid rgba(255, 211, 78, 0.48);
    border-radius: 50%;
    color: var(--def-yellow);
    background: rgba(255, 211, 78, 0.1);
    box-shadow: 0 0 42px rgba(255, 211, 78, 0.18);
}

.result-emblem svg { width: 2rem; height: 2rem; }
.battle-result-card .section-kicker { color: var(--def-lime); }

.battle-result-card h2 {
    margin: 0.15rem 0 0.5rem;
    font-size: clamp(1.6rem, 4vw, 2.3rem);
    line-height: 1.08;
}

.battle-result-card > p:not(.section-kicker) {
    margin: 0;
    color: var(--def-muted);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.55rem;
    margin: 1rem 0;
}

.result-stats div {
    display: grid;
    gap: 0.1rem;
    padding: 0.7rem;
    border: 1px solid var(--def-line);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.04);
}

.result-stats span { color: var(--def-muted); font-size: 0.72rem; }
.result-stats strong { color: var(--def-yellow); font-size: 1.45rem; }

.defender-touch {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.7rem;
    border-top: 1px solid var(--def-line);
    background: #080d16;
}

.touch-move {
    display: flex;
    gap: 0.45rem;
}

.defender-touch button {
    min-width: 4.3rem;
    min-height: 3.7rem;
    display: grid;
    place-items: center;
    align-content: center;
    gap: 0.05rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 7px;
    color: var(--def-paper);
    background: rgba(255, 255, 255, 0.07);
    font-size: 0.68rem;
    font-weight: 900;
    touch-action: none;
    user-select: none;
}

.defender-touch button.is-pressed,
.defender-touch button:active {
    color: #071019;
    border-color: var(--def-lime);
    background: var(--def-lime);
}

.defender-touch svg { width: 1.2rem; height: 1.2rem; }

.defender-touch .touch-fire {
    width: 5rem;
    min-height: 4.5rem;
    border-color: rgba(255, 84, 117, 0.55);
    color: #fff;
    background: rgba(255, 84, 117, 0.17);
}

.defender-side-panel {
    position: sticky;
    top: 7rem;
    min-width: 0;
    display: grid;
    gap: 0.5rem;
    padding: 0.7rem;
    overflow: hidden;
}

.wave-objective {
    position: relative;
    min-height: 5.8rem;
    padding: 0.1rem;
}

.wave-objective .section-kicker { color: var(--def-lime); }

.wave-objective > span {
    position: absolute;
    top: 0.12rem;
    right: 0;
    color: var(--def-yellow);
    font: 900 0.7rem/1 Consolas, monospace;
}

.wave-objective h2 {
    max-width: calc(100% - 3.6rem);
    margin: 0.15rem 0 0;
    font-size: 1.25rem;
    line-height: 1.15;
}

.wave-objective > p:last-child {
    margin: 0.35rem 0 0;
    color: var(--def-muted);
    font-size: 0.8rem;
    line-height: 1.45;
}

.battle-stats {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.35rem;
}

.battle-stats div {
    min-width: 0;
    display: grid;
    gap: 0.05rem;
    padding: 0.58rem 0.38rem;
    border: 1px solid var(--def-line);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.045);
}

.battle-stats span,
.wave-progress-card span,
.knowledge-head span {
    overflow: hidden;
    color: var(--def-muted);
    font-size: 0.61rem;
    font-weight: 900;
    text-overflow: ellipsis;
    text-transform: uppercase;
}

.battle-stats strong {
    font-size: 1.15rem;
    line-height: 1.15;
}

.wave-progress-card,
.java-knowledge-card,
.battle-console,
.defender-controls {
    border: 1px solid var(--def-line);
    border-radius: 7px;
    background: rgba(255, 255, 255, 0.035);
}

.wave-progress-card {
    padding: 0.65rem 0.7rem;
}

.wave-progress-card > div:first-child,
.knowledge-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.7rem;
}

.wave-progress-card strong,
.knowledge-head strong {
    color: var(--def-cyan);
    font: 900 0.7rem/1 Consolas, monospace;
}

.wave-progress {
    height: 0.42rem;
    margin-top: 0.5rem;
    overflow: hidden;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
}

.wave-progress span {
    width: 0;
    height: 100%;
    display: block;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--def-red), var(--def-yellow), var(--def-lime));
    transition: width 220ms ease;
}

.wave-progress-card p {
    margin: 0.3rem 0 0;
    color: var(--def-muted);
    font-size: 0.7rem;
}

.java-knowledge-card { padding: 0.65rem 0.7rem; }
.knowledge-head strong { color: var(--def-yellow); }

.java-knowledge-card h3 {
    margin: 0.3rem 0 0.2rem;
    font-size: 0.96rem;
}

.java-knowledge-card p {
    margin: 0;
    color: var(--def-muted);
    font-size: 0.76rem;
    line-height: 1.42;
}

.java-knowledge-card code,
.defender-wave-grid code {
    color: var(--def-yellow);
    font-family: Consolas, monospace;
}

.battle-console { overflow: hidden; }

.console-title {
    min-height: 2rem;
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0 0.65rem;
    color: rgba(247, 244, 236, 0.62);
    border-bottom: 1px solid rgba(255, 255, 255, 0.09);
    font: 900 0.62rem/1 Consolas, monospace;
}

.console-title span {
    width: 0.48rem;
    height: 0.48rem;
    border-radius: 50%;
    background: var(--def-lime);
    box-shadow: 0 0 11px rgba(167, 239, 92, 0.72);
}

.console-lines {
    min-height: 4.25rem;
    max-height: 5rem;
    overflow: auto;
    padding: 0.55rem 0.65rem;
    color: #cbd8e7;
    background: rgba(2, 4, 8, 0.68);
    font: 0.68rem/1.42 Consolas, monospace;
}

.console-lines p { margin: 0 0 0.25rem; }
.console-lines p:last-child { margin-bottom: 0; }
.console-lines span { color: var(--def-cyan); }
.console-lines .is-success { color: var(--def-lime); }
.console-lines .is-error { color: #ff91a7; }

.defender-controls { padding: 0.58rem 0.7rem; }
.defender-controls .section-kicker { color: var(--def-lime); }

.defender-controls dl {
    display: grid;
    gap: 0.22rem;
    margin: 0.3rem 0 0;
}

.defender-controls dl div {
    display: grid;
    grid-template-columns: 6.9rem 1fr;
    gap: 0.5rem;
}

.defender-controls dt {
    color: var(--def-yellow);
    font: 900 0.69rem/1.45 Consolas, monospace;
}

.defender-controls dd {
    margin: 0;
    color: var(--def-muted);
    font-size: 0.74rem;
}

.defender-learning {
    position: relative;
    padding: 4.8rem 0;
    overflow: hidden;
    color: var(--def-paper);
    border-top: 1px solid var(--def-line);
    background:
        radial-gradient(circle at 82% 22%, rgba(157, 123, 255, 0.12), transparent 28rem),
        #0a0e16;
}

.defender-learning-heading > p { color: var(--def-muted); }

.defender-wave-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.75rem;
    margin-top: 1.5rem;
}

.defender-wave-grid article {
    min-height: 18rem;
    display: grid;
    align-content: start;
    padding: 1.1rem;
    transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.defender-wave-grid article:hover {
    transform: translateY(-3px);
    border-color: rgba(69, 220, 255, 0.38);
}

.defender-wave-grid article.is-complete {
    border-color: rgba(167, 239, 92, 0.42);
    background: linear-gradient(145deg, rgba(167, 239, 92, 0.08), rgba(10, 14, 24, 0.96));
}

.defender-wave-grid article.is-active {
    border-color: rgba(255, 211, 78, 0.48);
    box-shadow: 0 20px 55px rgba(255, 211, 78, 0.08);
}

.wave-card-number {
    color: var(--def-yellow);
    font: 900 0.74rem/1 Consolas, monospace;
}

.defender-wave-grid svg {
    width: 2.2rem;
    height: 2.2rem;
    margin: 2rem 0 0.9rem;
    color: var(--def-cyan);
    stroke-width: 1.5;
}

.defender-wave-grid h3 { margin: 0; font-size: 1.25rem; }

.defender-wave-grid p {
    margin: 0.45rem 0 1rem;
    color: var(--def-muted);
}

.defender-wave-grid article > span {
    margin-top: auto;
    color: var(--def-lime);
    font-size: 0.76rem;
    font-weight: 900;
}

.defender-design-note {
    display: grid;
    grid-template-columns: minmax(14rem, 0.75fr) minmax(0, 1.25fr);
    gap: 2rem;
    align-items: center;
    margin-top: 0.75rem;
    padding: 1.35rem;
    background:
        linear-gradient(110deg, rgba(69, 220, 255, 0.08), rgba(167, 239, 92, 0.05)),
        var(--def-panel);
}

.defender-design-note .section-kicker { color: var(--def-lime); }
.defender-design-note h3 { margin: 0.1rem 0 0; font-size: 1.5rem; }
.defender-design-note > p { margin: 0; color: var(--def-muted); }

.defender-stage:fullscreen {
    width: 100vw;
    height: 100vh;
    aspect-ratio: auto;
    background: #020409;
}

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

@media (max-width: 1080px) {
    .defender-shell {
        grid-template-columns: minmax(0, 1fr);
    }

    .defender-side-panel {
        position: static;
        grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 1fr);
        align-items: start;
    }

    .wave-objective { grid-row: span 2; }
    .battle-stats,
    .wave-progress-card,
    .java-knowledge-card,
    .defender-controls { grid-column: 2; }
    .battle-console { grid-column: 1; }
}

@media (max-width: 900px) {
    .defender-shell {
        width: min(calc(100% - 1rem), 1160px);
        padding-top: 6.4rem;
    }

    .defender-game-head {
        grid-template-columns: 1fr;
    }

    .defender-actions {
        width: 100%;
    }

    .defender-touch { display: flex; }

    .defender-wave-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 680px) {
    .defender-shell {
        width: 100%;
        gap: 0.6rem;
        padding-top: 5.9rem;
    }

    .defender-game-panel,
    .defender-side-panel {
        border-right: 0;
        border-left: 0;
        border-radius: 0;
    }

    .defender-title h1 {
        font-size: clamp(2rem, 10vw, 2.8rem);
    }

    .defender-title > p:last-child { font-size: 0.82rem; }

    .defender-stage {
        min-height: 0;
        aspect-ratio: 4 / 3;
    }

    .compile-modal {
        align-items: stretch;
        padding: 0.35rem;
    }

    .compile-card { border-radius: 6px; }
    .compile-status { display: none; }
    .compile-answers { grid-template-columns: 1fr; }
    .compile-answer { min-height: 2.7rem; }
    .code-editor pre { min-height: 4.5rem; max-height: 7.5rem; }

    .defender-side-panel { grid-template-columns: 1fr; }

    .wave-objective,
    .battle-stats,
    .wave-progress-card,
    .java-knowledge-card,
    .battle-console,
    .defender-controls {
        grid-column: auto;
        grid-row: auto;
    }

    .wave-objective { min-height: 0; }
    .defender-controls { display: none; }

    .defender-wave-grid,
    .defender-design-note {
        grid-template-columns: 1fr;
    }

    .defender-wave-grid article { min-height: 0; }
    .defender-wave-grid svg { margin-top: 1.4rem; }
}

@media (max-width: 420px) {
    .defender-game-head { padding: 0.8rem; }
    .defender-actions .btn { font-size: 0.76rem; }
    .defender-touch { padding: 0.55rem; }
    .defender-touch button { min-width: 3.7rem; }
    .defender-touch .touch-fire { width: 4.4rem; }
}

@media (prefers-reduced-motion: reduce) {
    .loading-reticle { animation: none; }
    .compile-answer,
    .defender-wave-grid article { transition: none; }
}