/* ════════════════════════════════════════════
   RESET & TOKENS
════════════════════════════════════════════ */
:root {
    --bg: #040c18;
    --surf: #091424;
    --surf2: #0d1c35;
    --bord: #1a3358;
    --pri: #00d4ff;
    --grn: #00ff88;
    --red: #ff3366;
    --yel: #ffd700;
    --pur: #b44fff;
    --org: #ff6b35;
    --txt: #d8eeff;
    --dim: #4a6a8a;
    --nav: 54px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    height: 100%;
}

body {
    font-family: 'Nunito', sans-serif;
    background: var(--bg);
    color: var(--txt);
    height: 100%;
    overflow: hidden;
    /* only body is locked; pages scroll internally */
}

/* subtle dot grid on body — shows through transparent page backgrounds */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image:
        radial-gradient(circle, rgba(0, 212, 255, .12) 1px, transparent 1px);
    background-size: 40px 40px;
}

/* ════════════════════════════════════════════
   NAV
════════════════════════════════════════════ */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav);
    background: rgba(4, 12, 24, .97);
    border-bottom: 1px solid var(--bord);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 14px;
    z-index: 500;
    backdrop-filter: blur(14px);
}

.logo {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 1.05rem;
    color: var(--pri);
    text-shadow: 0 0 20px rgba(0, 212, 255, .5);
    letter-spacing: 1px;
    white-space: nowrap;
}

.logo b {
    color: var(--grn);
}

.nav-links {
    display: flex;
    gap: 3px;
    align-items: center;
}

.nb {
    padding: 5px 10px;
    border: 1px solid var(--bord);
    background: transparent;
    color: var(--dim);
    border-radius: 7px;
    cursor: pointer;
    font: 700 .72rem 'Nunito', sans-serif;
    transition: .18s;
    white-space: nowrap;
}

.nb:hover {
    border-color: var(--pri);
    color: var(--pri);
    background: rgba(0, 212, 255, .07);
}

.nb.on {
    border-color: var(--pri);
    color: var(--pri);
    background: rgba(0, 212, 255, .13);
    box-shadow: 0 0 12px rgba(0, 212, 255, .25);
}

.ham {
    display: none;
    width: 36px;
    height: 36px;
    border: 1px solid var(--bord);
    background: var(--surf2);
    color: var(--pri);
    border-radius: 7px;
    cursor: pointer;
    font-size: 1.15rem;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

@media(max-width:820px) {
    .ham {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: var(--nav);
        left: 0;
        right: 0;
        background: rgba(4, 12, 24, .99);
        flex-direction: column;
        padding: 10px;
        gap: 6px;
        border-bottom: 1px solid var(--bord);
        transform: translateY(-120%);
        opacity: 0;
        visibility: hidden;
        transition: transform .28s, opacity .28s;
        z-index: 490;
        backdrop-filter: blur(14px);
        pointer-events: none;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
    }

    .nb {
        width: 100%;
        padding: 10px 14px;
        font-size: .84rem;
    }
}

/* ════════════════════════════════════════════
   PAGE SYSTEM  — THE FIX
   All pages use class="page" and are hidden.
   Active page gets class="page on".
   We NEVER set display on #pg-xxx alone —
   only on .page.on and specific .page.on combos.
   This way no ID selector ever fights the class.
════════════════════════════════════════════ */
.page {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--nav);
    background: var(--bg);
    /* solid — blocks everything behind */
    overflow-y: auto;
    overflow-x: hidden;
    z-index: 10;
}

/* default on = block scroll */
.page.on {
    display: block;
}

/* home needs flex centering */
.page.on.home-pg {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    overflow-y: auto;
}

/* simulator needs flex column with no scroll (canvas fills space) */
.page.on.sim-pg {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ════════════════════════════════════════════
   HOME PAGE
════════════════════════════════════════════ */
.home-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100%;
    padding: clamp(60px, 12vh, 120px) clamp(16px, 5vw, 40px) 60px;
    text-align: center;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}


.badge {
    background: rgba(0, 212, 255, .1);
    border: 1px solid rgba(0, 212, 255, .3);
    color: var(--pri);
    padding: 5px 18px;
    border-radius: 20px;
    font: normal .68rem 'Share Tech Mono', monospace;
    letter-spacing: 3px;
    margin-bottom: 22px;
    animation: pulse 3s ease infinite;
}

@keyframes pulse {

    0%,
    100% {
        box-shadow: none
    }

    50% {
        box-shadow: 0 0 22px rgba(0, 212, 255, .4)
    }
}

h1.hero {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(1.8rem, 8vw, 4.2rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 20px;
    width: 100%;
}


h1.hero .ha {
    color: var(--txt);
}

h1.hero .hb {
    color: var(--pri);
    text-shadow: 0 0 30px rgba(0, 212, 255, .55);
}

.sub {
    color: var(--dim);
    font-size: clamp(0.85rem, 2.5vw, 1.05rem);
    max-width: 650px;
    line-height: 1.7;
    margin-bottom: 40px;
    padding: 0 10px;
}


.hgrid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 160px), 1fr));
    gap: 12px;
    max-width: 850px;
    width: 100%;
    margin-bottom: 40px;
}


.hcard {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 13px;
    padding: 20px 14px;
    cursor: pointer;
    transition: .28s;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hcard::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--pri), transparent);
    opacity: 0;
    transition: .28s;
}

.hcard:hover {
    border-color: var(--pri);
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 212, 255, .13);
}

.hcard:hover::before {
    opacity: 1;
}

.hcard .ic {
    font-size: 2.1rem;
    margin-bottom: 8px;
}

.hcard h3 {
    font-family: 'Orbitron', sans-serif;
    font-size: .76rem;
    color: var(--pri);
    margin-bottom: 5px;
}

.hcard p {
    font-size: .73rem;
    color: var(--dim);
    line-height: 1.5;
}

.cta {
    padding: 13px 40px;
    background: linear-gradient(135deg, var(--pri), #0060bb);
    color: #fff;
    border: none;
    border-radius: 11px;
    font-family: 'Orbitron', sans-serif;
    font-size: .84rem;
    font-weight: 700;
    cursor: pointer;
    letter-spacing: 2px;
    box-shadow: 0 5px 22px rgba(0, 212, 255, .38);
    transition: .25s;
    margin-bottom: 36px;
}

.cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 9px 32px rgba(0, 212, 255, .55);
}

.home-foot {
    width: 100%;
    text-align: center;
    padding: 20px 14px;
    border-top: 1px solid var(--bord);
}

.home-foot p {
    font-size: .84rem;
    color: var(--dim);
}

.home-foot b {
    color: var(--pri);
}

.foot-links {
    display: flex;
    justify-content: center;
    gap: 18px;
    margin-top: 9px;
}

.foot-links a {
    color: var(--dim);
    text-decoration: none;
    font: .76rem 'Share Tech Mono', monospace;
    transition: .18s;
}

.foot-links a:hover {
    color: var(--pri);
}

/* ════════════════════════════════════════════
   SHARED SECTION STYLES
════════════════════════════════════════════ */
.sec-wrap {
    max-width: 1160px;
    margin: 0 auto;
    padding: 22px clamp(10px, 3vw, 22px) 50px;
}

.sec-hd {
    text-align: center;
    margin-bottom: 26px;
}

.sec-hd h2 {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(1.2rem, 4vw, 1.75rem);
    color: var(--pri);
    margin-bottom: 5px;
}

.sec-hd p {
    color: var(--dim);
    font-size: .86rem;
}

@keyframes fup {
    from {
        opacity: 0;
        transform: translateY(14px)
    }

    to {
        opacity: 1;
        transform: translateY(0)
    }
}

.panel {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 13px;
    padding: 18px;
}

.ph {
    font-family: 'Orbitron', sans-serif;
    font-size: .85rem;
    color: var(--pri);
    margin-bottom: 13px;
    display: flex;
    align-items: center;
    gap: 7px;
}

/* ════════════════════════════════════════════
   LEARN PAGE
════════════════════════════════════════════ */
.ggrid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 270px), 1fr));
    gap: 14px;
}

.gcard {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 13px;
    padding: 18px;
    transition: .28s;
    animation: fup .4s ease both;
}

.gcard:hover {
    border-color: var(--pri);
    box-shadow: 0 0 24px rgba(0, 212, 255, .08);
}

.gc-hd {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 9px;
}

.gc-ico {
    width: 46px;
    height: 46px;
    background: var(--surf2);
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--bord);
    flex-shrink: 0;
}

.gc-nm {
    font-family: 'Orbitron', sans-serif;
    font-size: .87rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.gc-fm {
    font-family: 'Share Tech Mono', monospace;
    font-size: .76rem;
    color: var(--yel);
}

.gc-ds {
    font-size: .78rem;
    color: var(--dim);
    line-height: 1.55;
    margin-bottom: 12px;
}

.gc-demo {
    background: var(--surf2);
    border-radius: 9px;
    padding: 9px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 7px;
}

.gc-ins {
    display: flex;
    flex-direction: column;
    gap: 7px;
}

.gc-ir {
    display: flex;
    align-items: center;
    gap: 7px;
}

.ilbl {
    font-family: 'Share Tech Mono', monospace;
    font-size: .78rem;
    color: var(--dim);
    width: 13px;
}

.tog {
    width: 42px;
    height: 21px;
    border-radius: 11px;
    border: 2px solid var(--bord);
    background: var(--surf);
    cursor: pointer;
    position: relative;
    transition: .25s;
    display: inline-flex;
    align-items: center;
    padding: 2px;
    flex-shrink: 0;
}

.tog.on {
    border-color: var(--grn);
    background: rgba(0, 255, 136, .14);
}

.tog::after {
    content: '';
    width: 13px;
    height: 13px;
    border-radius: 50%;
    background: var(--dim);
    transition: .25s;
    flex-shrink: 0;
}

.tog.on::after {
    background: var(--grn);
    transform: translateX(19px);
    box-shadow: 0 0 6px var(--grn);
}

.ival {
    font-family: 'Share Tech Mono', monospace;
    font-size: .88rem;
    font-weight: 700;
    color: var(--dim);
    width: 11px;
}

.oled {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 3px solid var(--bord);
    background: var(--surf);
    display: flex;
    align-items: center;
    justify-content: center;
    font: 700 1rem 'Share Tech Mono', monospace;
    color: var(--dim);
    transition: .25s;
    flex-shrink: 0;
}

.oled.on {
    border-color: var(--grn);
    background: rgba(0, 255, 136, .15);
    color: var(--grn);
    box-shadow: 0 0 18px rgba(0, 255, 136, .5);
}

.oled.off {
    border-color: var(--red);
    background: rgba(255, 51, 102, .07);
    color: var(--red);
}

.olbl {
    font-size: .62rem;
    font-family: 'Share Tech Mono', monospace;
    color: var(--dim);
    margin-top: 3px;
    text-align: center;
}

.tt-mini {
    width: 100%;
    border-collapse: collapse;
    font-family: 'Share Tech Mono', monospace;
    font-size: .72rem;
    margin-top: 9px;
}

.tt-mini th {
    background: var(--surf2);
    color: var(--pri);
    padding: 3px 6px;
    border: 1px solid var(--bord);
    text-align: center;
}

.tt-mini td {
    padding: 3px 6px;
    text-align: center;
    border: 1px solid var(--bord);
}

.tt-mini tr.hi td {
    background: rgba(0, 212, 255, .12);
    color: var(--pri);
    font-weight: 700;
}

/* Learn card icon glow on hover */
.gcard:hover .gc-ico {
    box-shadow: 0 0 14px rgba(0, 212, 255, .18);
}

/* output LED pulse animation when ON */
@keyframes ledPulse {

    0%,
    100% {
        box-shadow: 0 0 14px rgba(0, 255, 136, .4);
    }

    50% {
        box-shadow: 0 0 24px rgba(0, 255, 136, .7);
    }
}

.oled.on {
    animation: ledPulse 1.6s ease-in-out infinite;
}

/* Learn description better readability */
.gc-ds {
    border-left: 2px solid var(--bord);
    padding-left: 10px;
}

/* ════════════════════════════════════════════
   TRUTH TABLES
════════════════════════════════════════════ */
.gtabs {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 18px;
}

.gtab {
    padding: 7px 14px;
    border: 1px solid var(--bord);
    background: var(--surf);
    color: var(--dim);
    border-radius: 8px;
    cursor: pointer;
    font: 700 .75rem 'Share Tech Mono', monospace;
    transition: .2s;
    letter-spacing: .5px;
}

.gtab:hover {
    border-color: var(--pri);
    color: var(--pri);
}

.gtab.on {
    background: linear-gradient(135deg, rgba(0, 212, 255, .15), rgba(180, 79, 255, .12));
    border-color: var(--pri);
    color: var(--pri);
    box-shadow: 0 0 12px rgba(0, 212, 255, .12);
}

.tt-lay {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 700px) {
    .tt-lay {
        grid-template-columns: 1fr;
    }
}

.panel {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 14px;
    padding: 20px;
    backdrop-filter: blur(12px);
}

.ph {
    font-family: 'Orbitron', sans-serif;
    font-size: .88rem;
    color: var(--pri);
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tt-full {
    width: 100%;
    border-collapse: collapse;
    font-family: 'Share Tech Mono', monospace;
    font-size: .82rem;
}

.tt-full th {
    background: var(--surf2);
    color: var(--pri);
    padding: 7px 10px;
    border: 1px solid var(--bord);
    text-align: center;
    font-weight: 700;
    letter-spacing: .5px;
}

.tt-full td {
    padding: 6px 10px;
    text-align: center;
    border: 1px solid var(--bord);
    transition: background .15s;
}

.tt-full td.v1 {
    color: var(--grn);
    font-weight: 700;
}

.tt-full td.v0 {
    color: var(--red);
    opacity: .7;
}

.tt-full tbody tr:nth-child(even) {
    background: rgba(0, 212, 255, .03);
}

.tt-full tbody tr:hover td {
    background: rgba(0, 212, 255, .08);
}

.gbig {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 12px 0;
    background: var(--surf2);
    border-radius: 10px;
    margin-bottom: 14px;
}

.gds {
    font-size: .82rem;
    color: var(--dim);
    line-height: 1.6;
    margin-bottom: 10px;
}

.gfm {
    font-family: 'Share Tech Mono', monospace;
    font-size: .9rem;
    color: var(--yel);
    background: var(--surf2);
    padding: 8px 12px;
    border-radius: 8px;
    margin-bottom: 14px;
    text-align: center;
    border: 1px solid rgba(255, 215, 0, .15);
}

.try-box {
    background: linear-gradient(135deg, rgba(0, 212, 255, .06), rgba(180, 79, 255, .04));
    border: 1px solid rgba(0, 212, 255, .2);
    border-radius: 12px;
    padding: 14px;
}

.try-lbl {
    font: 700 .72rem 'Orbitron', sans-serif;
    color: var(--pri);
    margin-bottom: 10px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.try-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 12px;
}

.try-ig {
    display: flex;
    align-items: center;
    gap: 6px;
}

.try-il {
    font: 700 .82rem 'Share Tech Mono', monospace;
    color: var(--dim);
}

.try-out {
    font: 700 .88rem 'Share Tech Mono', monospace;
    background: var(--surf2);
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--bord);
}

/* ════════════════════════════════════════════
   SIMULATOR
════════════════════════════════════════════ */
.stbar {
    display: flex;
    align-items: center;
    gap: 3px;
    padding: 5px 8px;
    background: var(--surf);
    border-bottom: 1px solid var(--bord);
    flex-shrink: 0;
    overflow-x: auto;
    scrollbar-width: none;
    white-space: nowrap;
}

.stbar::-webkit-scrollbar {
    display: none;
}

.sep {
    width: 1px;
    height: 20px;
    background: var(--bord);
    margin: 0 3px;
    flex-shrink: 0;
}

.stlbl {
    font-size: .6rem;
    color: var(--dim);
    font-family: 'Share Tech Mono', monospace;
    flex-shrink: 0;
    user-select: none;
}

.tb {
    padding: 5px 9px;
    border: 1px solid var(--bord);
    background: var(--surf2);
    color: var(--txt);
    border-radius: 6px;
    cursor: pointer;
    font: 700 .7rem 'Nunito', sans-serif;
    transition: .15s;
    display: inline-flex;
    align-items: center;
    gap: 3px;
    flex-shrink: 0;
}

.tb:hover {
    border-color: var(--pri);
    color: var(--pri);
}

.tb.sel {
    border-color: var(--pri);
    color: var(--pri);
    background: rgba(0, 212, 255, .12);
}

.tb.active {
    border-color: var(--grn);
    color: var(--grn);
    background: rgba(0, 255, 136, .08);
}

.zdsp {
    font-family: 'Share Tech Mono', monospace;
    font-size: .68rem;
    color: var(--dim);
    padding: 4px 7px;
    background: var(--surf2);
    border: 1px solid var(--bord);
    border-radius: 5px;
    min-width: 46px;
    text-align: center;
    flex-shrink: 0;
}

@media(max-width:540px) {
    .tb .tl {
        display: none;
    }

    .stlbl {
        display: none;
    }
}

.simbody {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* palette */
.palette {
    width: 105px;
    background: var(--surf);
    border-right: 1px solid var(--bord);
    padding: 6px 5px;
    overflow-y: auto;
    flex-shrink: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--bord) transparent;
}

.pal-sec {
    font-size: .56rem;
    color: var(--dim);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin: 7px 0 3px;
    font-family: 'Share Tech Mono', monospace;
}

.pal-sec:first-child {
    margin-top: 2px;
}

/* learn card multi-output */
.gc-outs {
    display: flex;
    align-items: center;
    gap: 12px;
}

.oled-grp {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 3px;
}

.gc-ins {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 60px;
}


.pal-item {
    display: flex;
    align-items: center;
    gap: 5px;
    padding: 5px 5px;
    border: 1px solid var(--bord);
    background: var(--surf2);
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 3px;
    font: 700 .68rem 'Nunito', sans-serif;
    color: var(--txt);
    transition: .15s;
    user-select: none;
}

.pal-item:hover,
.pal-item.sel {
    border-color: var(--pri);
    color: var(--pri);
    background: rgba(0, 212, 255, .1);
}

.pal-item canvas {
    pointer-events: none;
    flex-shrink: 0;
}

@media(max-width:640px) {
    .simbody {
        flex-direction: column-reverse;
    }

    .palette {
        width: 100%;
        height: 78px;
        border-right: none;
        border-top: 1px solid var(--bord);
        display: flex;
        flex-direction: row;
        padding: 5px 8px;
        gap: 5px;
        overflow-x: auto;
        overflow-y: hidden;
        align-items: center;
        flex-shrink: 0;
    }

    .pal-sec {
        display: none;
    }

    .pal-item {
        min-width: 48px;
        height: 58px;
        flex-direction: column;
        justify-content: center;
        margin-bottom: 0;
        gap: 2px;
        font-size: .58rem;
        flex-shrink: 0;
    }
}

/* canvas wrap */
.simwrap {
    flex: 1;
    position: relative;
    overflow: hidden;
    min-width: 0;
    min-height: 0;
}

#SIM_CANVAS {
    display: block;
    touch-action: none;
}

/* overlays */
.hint-bar {
    position: absolute;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(4, 12, 24, .92);
    border: 1px solid var(--bord);
    border-radius: 7px;
    padding: 5px 13px;
    font: .67rem 'Share Tech Mono', monospace;
    color: var(--dim);
    white-space: nowrap;
    pointer-events: none;
    z-index: 20;
    max-width: 92%;
    overflow: hidden;
    text-overflow: ellipsis;
    backdrop-filter: blur(6px);
}

.zbadge {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(4, 12, 24, .85);
    border: 1px solid var(--bord);
    border-radius: 5px;
    padding: 3px 8px;
    font: .64rem 'Share Tech Mono', monospace;
    color: var(--dim);
    pointer-events: none;
    z-index: 20;
}

/* context menu */
.cmenu {
    position: absolute;
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 8px;
    padding: 4px;
    z-index: 200;
    min-width: 132px;
    box-shadow: 0 8px 28px rgba(0, 0, 0, .55);
    display: none;
}

.cmrow {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 7px 10px;
    border-radius: 5px;
    cursor: pointer;
    font: .77rem 'Nunito', sans-serif;
    font-weight: 700;
    color: var(--txt);
    transition: .13s;
}

.cmrow:hover {
    background: rgba(0, 212, 255, .1);
    color: var(--pri);
}

.cmrow.danger:hover {
    background: rgba(255, 51, 102, .1);
    color: var(--red);
}

/* ════════════════════════════════════════════
   TRUTH TABLES
════════════════════════════════════════════ */
.gtabs {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    justify-content: center;
    margin-bottom: 20px;
}

.gtab {
    padding: 5px 14px;
    border: 2px solid var(--bord);
    background: var(--surf);
    color: var(--dim);
    border-radius: 8px;
    cursor: pointer;
    font: 700 .68rem 'Orbitron', sans-serif;
    transition: .18s;
}

.gtab:hover {
    border-color: var(--pri);
    color: var(--pri);
}

.gtab.on {
    border-color: var(--pri);
    color: var(--pri);
    background: rgba(0, 212, 255, .11);
}

.tt-lay {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    align-items: start;
}

@media(max-width:600px) {
    .tt-lay {
        grid-template-columns: 1fr;
    }
}

.tt-full {
    width: 100%;
    border-collapse: collapse;
    font-family: 'Share Tech Mono', monospace;
}

.tt-full th {
    background: var(--surf2);
    color: var(--pri);
    padding: 7px 12px;
    text-align: center;
    border: 1px solid var(--bord);
    font-size: .83rem;
}

.tt-full td {
    padding: 6px 12px;
    text-align: center;
    border: 1px solid var(--bord);
    font-size: .83rem;
}

.tt-full tr:hover td {
    background: rgba(0, 212, 255, .04);
}

.gbig {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 18px;
    background: var(--surf2);
    border-radius: 9px;
    margin-bottom: 12px;
}

.gds {
    font-size: .82rem;
    color: var(--dim);
    line-height: 1.65;
    margin-bottom: 9px;
}

.gfm {
    font-family: 'Share Tech Mono', monospace;
    font-size: .9rem;
    color: var(--yel);
    background: var(--surf2);
    padding: 5px 11px;
    border-radius: 7px;
    display: inline-block;
    margin-bottom: 14px;
}

.try-box {
    background: var(--surf2);
    border-radius: 9px;
    padding: 12px;
}

.try-lbl {
    font-size: .64rem;
    color: var(--dim);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 8px;
    font-family: 'Share Tech Mono', monospace;
}

.try-row {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
    margin-bottom: 9px;
}

.try-ig {
    display: flex;
    align-items: center;
    gap: 7px;
}

.try-il {
    font-family: 'Share Tech Mono', monospace;
    font-size: .9rem;
    color: var(--txt);
}

.try-out {
    font-family: 'Share Tech Mono', monospace;
    font-size: .9rem;
}

/* ════════════════════════════════════════════
   BOOLEAN ALGEBRA
════════════════════════════════════════════ */
.laws {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 10px;
    margin-bottom: 26px;
}

.law {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 11px;
    padding: 14px;
    transition: .22s;
    animation: fup .4s ease both;
}

.law:hover {
    border-color: var(--pri);
    transform: translateY(-2px);
    box-shadow: 0 7px 20px rgba(0, 212, 255, .09);
}

.law-nm {
    font-family: 'Orbitron', sans-serif;
    font-size: .72rem;
    color: var(--pri);
    margin-bottom: 6px;
}

.law-fm {
    font-family: 'Share Tech Mono', monospace;
    font-size: .79rem;
    color: var(--yel);
    margin-bottom: 5px;
    line-height: 1.9;
}

.law-ds {
    font-size: .73rem;
    color: var(--dim);
    line-height: 1.45;
}

.dm {
    border-color: var(--pur) !important;
}

.dm .law-nm {
    color: var(--pur);
}

.sym-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    gap: 7px;
    font-family: 'Share Tech Mono', monospace;
    font-size: .78rem;
    color: var(--dim);
    line-height: 1.9;
}

/* ════════════════════════════════════════════
   QUIZ
════════════════════════════════════════════ */
.qscr {
    display: none;
}

.qscr.on {
    display: block;
}

.qinner {
    max-width: 780px;
    margin: 0 auto;
    padding: 22px 14px 50px;
}

.qsetup {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

@media(max-width:600px) {
    .qsetup {
        grid-template-columns: 1fr;
    }
}

.diff-btn {
    padding: 8px 13px;
    border: 2px solid var(--bord);
    background: var(--surf);
    color: var(--dim);
    border-radius: 8px;
    cursor: pointer;
    font: 700 .78rem 'Nunito', sans-serif;
    transition: .18s;
    text-align: left;
    width: 100%;
}

.diff-btn:hover,
.diff-btn.on {
    border-color: var(--pri);
    color: var(--pri);
    background: rgba(0, 212, 255, .07);
}

.diff-btn[data-d="Medium"].on {
    border-color: var(--yel);
    color: var(--yel);
    background: rgba(255, 215, 0, .07);
}

.diff-btn[data-d="Hard"].on {
    border-color: var(--red);
    color: var(--red);
    background: rgba(255, 51, 102, .07);
}

.qni {
    background: var(--surf);
    border: 2px solid var(--bord);
    color: var(--txt);
    padding: 10px 13px;
    border-radius: 9px;
    font: 700 .92rem 'Nunito', sans-serif;
    outline: none;
    transition: .18s;
    width: 100%;
}

.qni:focus {
    border-color: var(--pri);
}

.qni::placeholder {
    color: var(--dim);
}

.qstart {
    padding: 12px;
    background: linear-gradient(135deg, var(--pri), #005ebc);
    color: #fff;
    border: none;
    border-radius: 9px;
    font: 700 .84rem 'Orbitron', sans-serif;
    cursor: pointer;
    letter-spacing: 1.5px;
    transition: .18s;
    width: 100%;
    box-shadow: 0 4px 18px rgba(0, 212, 255, .28);
}

.qstart:hover {
    transform: translateY(-2px);
    box-shadow: 0 7px 26px rgba(0, 212, 255, .46);
}

/* leaderboard */
.lff {
    padding: 4px 10px;
    border: 1px solid var(--bord);
    background: var(--surf);
    color: var(--dim);
    border-radius: 6px;
    cursor: pointer;
    font: 700 .7rem 'Nunito', sans-serif;
    transition: .15s;
}

.lff.on,
.lff:hover {
    border-color: var(--yel);
    color: var(--yel);
    background: rgba(255, 215, 0, .06);
}

.lbe {
    display: flex;
    align-items: center;
    gap: 9px;
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 11px;
    padding: 10px 13px;
    margin-bottom: 5px;
    transition: .22s;
    animation: fup .35s ease both;
}

.lbe:hover {
    border-color: var(--pri);
}

.lbe.r1 {
    border-color: var(--yel);
    background: rgba(255, 215, 0, .03);
}

.lbe.r2 {
    border-color: #aaa;
}

.lbe.r3 {
    border-color: #cd7f32;
}

.lrk {
    font-family: 'Orbitron', sans-serif;
    font-size: .9rem;
    font-weight: 900;
    min-width: 24px;
    text-align: center;
}

.r1 .lrk {
    color: var(--yel);
}

.r2 .lrk {
    color: #ccc;
}

.r3 .lrk {
    color: #cd7f32;
}

.lnm {
    flex: 1;
    font-weight: 800;
    font-size: .87rem;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.lsc {
    font-family: 'Orbitron', sans-serif;
    font-weight: 700;
    color: var(--pri);
    font-size: .9rem;
}

.lmt {
    font-size: .64rem;
    color: var(--dim);
    font-family: 'Share Tech Mono', monospace;
}

.lbg {
    padding: 2px 6px;
    border-radius: 4px;
    font: 700 .6rem 'Orbitron', sans-serif;
}

.lg-E {
    background: rgba(0, 255, 136, .13);
    color: var(--grn);
    border: 1px solid rgba(0, 255, 136, .26);
}

.lg-M {
    background: rgba(255, 215, 0, .1);
    color: var(--yel);
    border: 1px solid rgba(255, 215, 0, .26);
}

.lg-H {
    background: rgba(255, 51, 102, .1);
    color: var(--red);
    border: 1px solid rgba(255, 51, 102, .26);
}

/* quiz HUD */
.qhud {
    display: flex;
    align-items: center;
    gap: 7px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.hudv {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 7px;
    padding: 5px 11px;
    font: .75rem 'Share Tech Mono', monospace;
    color: var(--dim);
}

.hudv span {
    color: var(--pri);
    font-weight: 700;
}

.hudv.sk span {
    color: var(--yel);
}

.tbar {
    flex: 1;
    min-width: 70px;
    height: 6px;
    background: var(--surf2);
    border-radius: 3px;
    overflow: hidden;
}

.tfil {
    height: 100%;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--grn), var(--pri));
    transition: width .1s linear, background .3s;
}

.tfil.warn {
    background: linear-gradient(90deg, var(--red), var(--org));
}

/* quiz card */
.qcard {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 14px;
    padding: 20px;
    margin-bottom: 12px;
}

.qcat {
    font: .63rem 'Share Tech Mono', monospace;
    color: var(--dim);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 7px;
}

.qtxt {
    font-size: .93rem;
    font-weight: 700;
    line-height: 1.55;
    margin-bottom: 14px;
}

.qvis {
    display: flex;
    justify-content: center;
    margin-bottom: 12px;
}

.qt {
    border-collapse: collapse;
    font-family: 'Share Tech Mono', monospace;
    font-size: .78rem;
}

.qt th {
    background: var(--surf2);
    color: var(--pri);
    padding: 4px 12px;
    border: 1px solid var(--bord);
    text-align: center;
}

.qt td {
    padding: 4px 12px;
    border: 1px solid var(--bord);
    text-align: center;
}

.agrid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 7px;
}

@media(max-width:440px) {
    .agrid {
        grid-template-columns: 1fr;
    }
}

.ab {
    padding: 10px 12px;
    background: var(--surf2);
    border: 2px solid var(--bord);
    border-radius: 9px;
    color: var(--txt);
    font: 700 .85rem 'Nunito', sans-serif;
    cursor: pointer;
    transition: .18s;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 7px;
}

.ab:hover:not(:disabled) {
    border-color: var(--pri);
    background: rgba(0, 212, 255, .07);
    transform: translateX(2px);
}

.ab:disabled {
    cursor: default;
}

.ak {
    width: 23px;
    height: 23px;
    border-radius: 5px;
    background: var(--bord);
    display: flex;
    align-items: center;
    justify-content: center;
    font: 700 .63rem 'Orbitron', sans-serif;
    flex-shrink: 0;
}

.ab.cor {
    border-color: var(--grn) !important;
    background: rgba(0, 255, 136, .08) !important;
}

.ab.cor .ak {
    background: var(--grn);
    color: #000;
}

.ab.wrg {
    border-color: var(--red) !important;
    background: rgba(255, 51, 102, .06) !important;
}

.ab.wrg .ak {
    background: var(--red);
    color: #fff;
}

.ab.rev {
    border-color: var(--grn) !important;
    background: rgba(0, 255, 136, .04) !important;
    opacity: .55;
}

.ab.rev .ak {
    background: rgba(0, 255, 136, .35);
}

.qfb {
    margin-top: 10px;
    padding: 9px 13px;
    border-radius: 9px;
    font-size: .8rem;
    font-weight: 700;
    display: none;
    line-height: 1.5;
}

.qfb.on {
    display: block;
}

.qfb.cor {
    background: rgba(0, 255, 136, .08);
    border: 1px solid rgba(0, 255, 136, .28);
    color: var(--grn);
}

.qfb.wrg {
    background: rgba(255, 51, 102, .06);
    border: 1px solid rgba(255, 51, 102, .28);
    color: var(--red);
}

/* results */
.res-scr {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
    padding: 30px 14px;
}

.rem {
    font-size: 3.8rem;
    margin-bottom: 10px;
    animation: pop .5s cubic-bezier(.17, .67, .28, 1.4);
}

@keyframes pop {
    from {
        transform: scale(0)
    }

    to {
        transform: scale(1)
    }
}

.rtit {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.3rem;
    font-weight: 900;
    margin-bottom: 4px;
}

.rsco {
    font-family: 'Orbitron', sans-serif;
    font-size: 2.6rem;
    font-weight: 900;
    color: var(--pri);
    text-shadow: 0 0 28px rgba(0, 212, 255, .55);
    margin: 8px 0;
}

.rgrd {
    font-size: .84rem;
    color: var(--dim);
    margin-bottom: 20px;
}

.rstats {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 22px;
}

.rst {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 9px;
    padding: 9px 15px;
    text-align: center;
}

.rv {
    font-family: 'Orbitron', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--pri);
}

.rl {
    font-size: .61rem;
    color: var(--dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.rbtns {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
}

.rbtn {
    padding: 9px 22px;
    border-radius: 9px;
    font: 700 .74rem 'Orbitron', sans-serif;
    cursor: pointer;
    transition: .18s;
    letter-spacing: 1px;
}

.rbtn.p {
    background: linear-gradient(135deg, var(--pri), #005ebc);
    color: #fff;
    border: none;
    box-shadow: 0 4px 16px rgba(0, 212, 255, .28);
}

.rbtn.p:hover {
    transform: translateY(-2px);
}

.rbtn.s {
    background: transparent;
    border: 2px solid var(--bord);
    color: var(--dim);
}

.rbtn.s:hover {
    border-color: var(--pri);
    color: var(--pri);
}

/* ════════════════════════════════════════════
   SHARED HELPERS
════════════════════════════════════════════ */
.v1 {
    color: var(--grn) !important;
    font-weight: 700;
}

.v0 {
    color: var(--red) !important;
    font-weight: 700;
}

::-webkit-scrollbar {
    width: 4px;
    height: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--bord);
    border-radius: 2px;
}

.cp {
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    border-radius: 2px;
    animation: cf 1.4s ease-out forwards;
}

@keyframes cf {
    0% {
        opacity: 1;
        transform: translateY(-20px) rotate(0deg);
    }

    100% {
        opacity: 0;
        transform: translateY(220px) rotate(720deg);
    }
}

/* simulator HUD small items */
.cdsp {
    display: inline-block;
    margin-left: 10px;
    padding: 6px 8px;
    background: rgba(10, 18, 30, .55);
    border: 1px solid rgba(26, 51, 88, .6);
    color: var(--dim);
    font: 700 .72rem 'Share Tech Mono', monospace;
    border-radius: 7px;
}

.coord-badge {
    position: absolute;
    left: 8px;
    bottom: 8px;
    padding: 6px 8px;
    background: rgba(4, 12, 24, .9);
    border: 1px solid var(--bord);
    color: var(--dim);
    font: 700 .76rem 'Share Tech Mono', monospace;
    border-radius: 8px;
    z-index: 40;
    pointer-events: none;
}

/* ════════════════════════════════════════════
   CUSTOM MODAL (confirm / alert / prompt)
════════════════════════════════════════════ */
#modal-ov {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, .65);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9000;
    padding: 16px;
    opacity: 0;
    transition: opacity .22s ease;
}

#modal-ov.on {
    display: flex;
    opacity: 1;
    animation: modalFadeIn .22s ease forwards;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.mcard {
    background: var(--surf);
    border: 1px solid var(--bord);
    border-radius: 16px;
    padding: 28px 24px 22px;
    max-width: 420px;
    width: 100%;
    box-shadow: 0 20px 60px rgba(0, 0, 0, .55), 0 0 40px rgba(0, 212, 255, .08);
    text-align: center;
    animation: modalPop .28s cubic-bezier(.17, .67, .28, 1.3) forwards;
}

@keyframes modalPop {
    from {
        transform: scale(.85) translateY(16px);
        opacity: 0;
    }

    to {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

.m-ico {
    font-size: 2.4rem;
    margin-bottom: 12px;
}

.m-msg {
    font-size: .88rem;
    font-weight: 600;
    color: var(--txt);
    line-height: 1.6;
    margin-bottom: 20px;
    white-space: pre-line;
    word-break: break-word;
}

.m-btns {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.m-btn {
    padding: 10px 24px;
    border-radius: 9px;
    font: 700 .78rem 'Orbitron', sans-serif;
    cursor: pointer;
    letter-spacing: 1px;
    transition: .18s;
    border: none;
}

.m-btn-ok {
    background: linear-gradient(135deg, var(--pri), #005ebc);
    color: #fff;
    box-shadow: 0 4px 16px rgba(0, 212, 255, .28);
}

.m-btn-ok:hover {
    transform: translateY(-2px);
    box-shadow: 0 7px 24px rgba(0, 212, 255, .45);
}

.m-btn-can {
    background: transparent;
    border: 2px solid var(--bord);
    color: var(--dim);
}

.m-btn-can:hover {
    border-color: var(--red);
    color: var(--red);
    background: rgba(255, 51, 102, .06);
}

/* prompt input inside modal */
.m-input {
    background: var(--surf2);
    border: 2px solid var(--bord);
    color: var(--txt);
    padding: 10px 13px;
    border-radius: 9px;
    font: 700 .92rem 'Share Tech Mono', monospace;
    outline: none;
    transition: .18s;
    width: 100%;
    margin-bottom: 16px;
    text-align: center;
}

.m-input:focus {
    border-color: var(--pri);
    box-shadow: 0 0 12px rgba(0, 212, 255, .15);
}

.m-input::placeholder {
    color: var(--dim);
}

/* ════════════════════════════════════════════
   ADDITIONAL RESPONSIVENESS
════════════════════════════════════════════ */

/* Simulator: better small-screen toolbar */
@media (max-width: 480px) {
    .stbar {
        padding: 4px 5px;
        gap: 2px;
    }

    .tb {
        padding: 4px 6px;
        font-size: .65rem;
    }

    .zdsp {
        font-size: .6rem;
        min-width: 36px;
        padding: 3px 5px;
    }

    .sep {
        margin: 0 1px;
    }

    .cdsp {
        display: none;
    }

    .hint-bar {
        font-size: .58rem;
        padding: 4px 8px;
        bottom: 6px;
    }

    .zbadge {
        font-size: .56rem;
        padding: 2px 5px;
        bottom: 6px;
        right: 6px;
    }

    .coord-badge {
        font-size: .62rem;
        padding: 3px 6px;
        left: 4px;
        bottom: 4px;
    }
}

/* Quiz: better mobile layout */
@media (max-width: 380px) {
    .qhud {
        gap: 4px;
    }

    .hudv {
        padding: 4px 7px;
        font-size: .65rem;
    }

    .qcard {
        padding: 14px 12px;
    }

    .ab {
        padding: 8px 10px;
        font-size: .78rem;
    }

    .qtxt {
        font-size: .84rem;
    }
}

/* Learn: cards stack better below 360px */
@media (max-width: 360px) {
    .gc-demo {
        flex-direction: column;
        align-items: flex-start;
    }

    .gc-outs {
        margin-top: 6px;
    }

    .gcard {
        padding: 12px;
    }
}

/* Boolean algebra: smaller cards */
@media (max-width: 420px) {
    .laws {
        grid-template-columns: 1fr;
    }

    .sym-grid {
        grid-template-columns: 1fr;
    }
}