/* ============================================================
   Station chrome — mobile lab-app pass
   Short header codes, loud hero type, mission card first.
   Dark classroom + amber. No Orbitron, no neon purple.
   Loaded last so these rules win the cascade.
   ============================================================ */

/* ── Header: Speak-style short chrome, never the long topic ── */
header {
    height: calc(64px + env(safe-area-inset-top, 0px));
    padding: env(safe-area-inset-top, 0px) calc(20px + env(safe-area-inset-right, 0px)) 0 calc(20px + env(safe-area-inset-left, 0px));
    gap: 12px;
    z-index: 1000;
    box-sizing: border-box;
}

main {
    padding-top: calc(64px + env(safe-area-inset-top, 0px));
}

.logo-text {
    font-family: var(--font-thai), var(--font-display);
    font-weight: 700;
    font-size: 1.02rem;
    letter-spacing: 0;
    line-height: 1.2;
}

.header-center {
    font-family: var(--font-thai), var(--font-display);
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0;
    text-align: center;
    flex: 1 1 0;
    min-width: 0;
    overflow: hidden;
    text-overflow: clip;
    white-space: nowrap;
    opacity: 1;
    color: var(--text);
}

.header-center.is-brand {
    font-family: var(--font-thai), var(--font-display);
    font-weight: 700;
    letter-spacing: 0;
}

.header-center.is-code {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--accent);
}

@media (min-width: 801px) {
    .header-center.is-brand {
        visibility: hidden;
    }
}

/* ── Type: heavy display, tighter meta, comfortable body ── */
html[lang="th"] .topic-header-title,
html[lang="th"] .circuit-header-title,
html[lang="th"] .game-page-header-title,
html[lang="th"] .coop-header-title,
html[lang="th"] .qx-guardian-title {
    font-family: var(--font-thai);
    font-weight: 700;
}

.topic-header-title,
.circuit-header-title,
.game-page-header-title,
.coop-header-title {
    font-family: var(--font-thai), var(--font-display);
    font-weight: 700;
    letter-spacing: 0;
    line-height: 1.18;
}

.game-page-header-title {
    font-family: var(--font-thai), var(--font-display);
    text-shadow: none;
}

.topic-header-number,
.circuit-header-number,
.game-page-header-number,
.coop-header-number {
    font-family: var(--font-mono);
    font-weight: 700;
    letter-spacing: 0.1em;
    color: var(--accent);
}

.topic-header-desc,
.circuit-header-desc,
.game-page-header-desc {
    line-height: 1.55;
}

/* ── Mission card (Speak tasks / Duolingo energy, lab colors) ── */
.mission-card {
    background: #161310;
    border: 1px solid #3D3935;
    border-radius: 12px;
    padding: 14px 16px 16px;
    margin: 0 auto 16px;
    max-width: 720px;
}

.mission-card .puzzle-goal-strip,
.mission-card .circuit-objective {
    border: none;
    border-bottom: 1px solid #3D3935;
    border-radius: 0;
    padding: 0 0 12px;
    margin: 0 0 12px;
    background: transparent;
}

.mission-card .howto-strip {
    padding: 0;
    margin: 0 auto;
    max-width: none;
}

.mission-card .howto-title {
    font-size: 0.82rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: 0.02em;
}

.mission-card .howto-steps {
    gap: 6px;
}

.mission-card .howto-step {
    grid-template-columns: 1.4rem 1fr;
    gap: 6px;
}

.mission-card .howto-num {
    font-size: 0.88rem;
    padding-top: 1px;
}

.mission-card .howto-text {
    font-size: 0.95rem;
    line-height: 1.45;
    font-weight: 500;
}

.mission-card .puzzle-goal-label {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.mission-card .puzzle-goal-desc {
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.4;
}

.mission-card .puzzle-goal-status {
    font-size: 0.88rem;
    white-space: nowrap;
}

/* ── Theory drawer: chalkboard stays, not a dominating poster ── */
.theory-drawer {
    margin: 0 auto 20px;
    max-width: 800px;
}

.theory-drawer-toggle {
    list-style: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 44px;
    padding: 10px 14px;
    background: #141210;
    border: 1px solid #3D3935;
    border-radius: 10px;
    color: var(--text);
    transition: transform 160ms cubic-bezier(0.23, 1, 0.32, 1), background 160ms ease;
}

.theory-drawer-toggle::-webkit-details-marker {
    display: none;
}

.theory-drawer-toggle::after {
    content: '+';
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--accent);
    line-height: 1;
}

.theory-drawer[open] .theory-drawer-toggle {
    border-radius: 10px 10px 0 0;
    border-bottom-color: transparent;
}

.theory-drawer[open] .theory-drawer-toggle::after {
    content: '–';
}

.theory-drawer-toggle:active {
    transform: scale(0.98);
}

.theory-drawer-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.theory-drawer-label {
    font-family: var(--font-thai), var(--font-display);
    font-weight: 700;
    font-size: 0.95rem;
    line-height: 1.3;
}

.theory-drawer-hint {
    font-size: 0.78rem;
    color: var(--text-dim);
    font-weight: 500;
}

.theory-drawer[open] .theory-drawer-hint {
    display: none;
}

.theory-drawer-body {
    border: 1px solid #3D3935;
    border-top: none;
    border-radius: 0 0 10px 10px;
    padding: 12px 14px 14px;
    background: #0E0C0A;
}

.theory-drawer .pre-play-brief {
    margin: 0 0 12px;
    max-width: none;
    padding: 0 0 0 14px;
}

.theory-drawer .brief-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
    line-height: 1.35;
}

.theory-drawer .brief-text {
    font-size: 0.95rem;
    line-height: 1.65;
    margin-bottom: 0.7em;
}

.theory-drawer .theory-figure {
    margin: 0;
    max-width: none;
    padding: 12px 12px 10px;
    border-radius: 8px;
}

.theory-drawer .theory-art-title {
    font-weight: 700;
    font-size: 1.05rem;
    line-height: 1.3;
}

.theory-drawer .theory-art-caption {
    font-size: 0.88rem;
    line-height: 1.55;
    margin-top: 8px;
}

.back-btn:active {
    transform: scale(0.97);
}

/* ── Phone-width: app mission screen, not textbook chapter ── */
@media (max-width: 768px) {
    header {
        height: calc(56px + env(safe-area-inset-top, 0px));
        padding: env(safe-area-inset-top, 0px) calc(10px + env(safe-area-inset-right, 0px)) 0 calc(10px + env(safe-area-inset-left, 0px));
        gap: 8px;
    }

    .header-logo-img {
        width: 36px;
        height: 36px;
    }

    .header-controls {
        gap: 6px;
    }

    .toggle-btn {
        height: 44px;
        min-width: 44px;
        padding: 0 10px;
    }

    .header-center.is-brand {
        font-size: 0.92rem;
    }

    .header-center.is-code {
        font-size: 0.78rem;
    }

    main {
        padding-top: calc(56px + env(safe-area-inset-top, 0px));
    }

    .topic-page,
    .circuit-page-inner {
        padding: 10px 16px 28px;
    }

    #circuitPage {
        padding: 0;
    }

    .back-btn {
        margin-bottom: 10px;
        padding: 8px 12px;
        min-height: 44px;
        font-size: 0.88rem;
    }

    .topic-header,
    .circuit-header,
    .game-page-header,
    .coop-header {
        text-align: left;
        margin-bottom: 14px;
        padding: 0;
        background: transparent;
        border: none;
        border-radius: 0;
    }

    .topic-header-number,
    .circuit-header-number,
    .game-page-header-number,
    .coop-header-number {
        font-size: 0.7rem;
        margin-bottom: 6px;
        letter-spacing: 0.12em;
    }

    .topic-header-title,
    .circuit-header-title,
    .game-page-header-title,
    .coop-header-title {
        font-size: clamp(1.7rem, 7.4vw, 2.15rem);
        font-weight: 700;
        line-height: 1.16;
        margin-bottom: 8px;
        letter-spacing: 0;
        max-width: 20ch;
    }

    .topic-header-desc,
    .circuit-header-desc,
    .game-page-header-desc,
    .coop-header-desc {
        font-size: 0.95rem;
        line-height: 1.5;
        margin: 0;
        max-width: none;
        opacity: 1;
    }

    .mission-card {
        padding: 12px 14px 14px;
        margin-bottom: 14px;
    }

    .simulation-container {
        border-radius: 12px;
        padding: 14px;
        margin-bottom: 16px;
    }

    .sim-canvas-wrap {
        height: clamp(220px, 52vw, 300px);
        border-radius: 8px;
    }

    .howto-strip {
        padding-bottom: 12px;
        margin-bottom: 0;
    }

    .pre-play-brief {
        margin-bottom: 14px;
        padding-left: 14px;
    }

    .theory-figure {
        padding: 12px;
        margin-bottom: 16px;
        border-radius: 8px;
    }

    .quiz-section {
        padding: 16px 14px;
        border-radius: 12px;
    }

    .game-page-header {
        padding: 0 0 4px;
        margin-bottom: 14px;
    }

    #gamePage .topic-page {
        padding-bottom: 32px;
    }

    .game-viewport {
        border-radius: 12px;
        margin-bottom: 16px;
    }
}

@media (min-width: 768px) {
    .theory-drawer-hint { display: none; }
}

@media (max-width: 480px) {
    .topic-page,
    .circuit-page-inner {
        padding: 8px 14px calc(24px + env(safe-area-inset-bottom, 0px));
    }

    .topic-header-title,
    .circuit-header-title,
    .game-page-header-title {
        font-size: clamp(1.62rem, 8vw, 1.95rem);
        line-height: 1.18;
        max-width: none;
    }

    .btn {
        min-height: 48px;
    }

    .mission-card .puzzle-goal-strip {
        flex-wrap: wrap;
        gap: 6px;
    }

    .mission-card .puzzle-goal-status {
        width: 100%;
    }

    #gamePage .simulation-container {
        margin-top: 8px !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    .theory-drawer-toggle,
    .back-btn {
        transition: none;
    }
    .theory-drawer-toggle:active,
    .back-btn:active {
        transform: none;
    }
}