@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&display=swap');

/* ── ROOT ──────────────────────────────────────────────── */
:root {
    --bg: #030b14;
    --panel: rgba(8, 18, 32, 0.9);
    --border: rgba(255, 255, 255, 0.07);
    --amber: #f59e0b;
    --green: #4ade80;
    --blue: #38bdf8;
    --purple: #a855f7;
    --red: #f87171;
    --cyan: #22d3ee;
    --text: #f1f5f9;
    --muted: #64748b;
}

#phet-stage {
    position: absolute;
    top: 0;
    left: 0;
    width: 1280px;
    height: 720px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg);
    transform-origin: top left;
}

body.elec-page {
    font-family: 'Outfit', sans-serif;
    background: var(--bg);
    margin: 0;
    padding: 0;
    overflow: hidden;
}

body.elec-page::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 65% 55% at 10% 15%, rgba(245, 158, 11, 0.06) 0%, transparent 65%),
        radial-gradient(ellipse 55% 60% at 90% 80%, rgba(56, 189, 248, 0.05) 0%, transparent 65%),
        radial-gradient(ellipse 70% 40% at 50% 100%, rgba(74, 222, 128, 0.04) 0%, transparent 65%);
    pointer-events: none;
    z-index: 0;
}

/* ── NAV ───────────────────────────────────────────────── */
.elec-nav {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.55rem 1.4rem;
    background: rgba(3, 11, 20, 0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}

.elec-nav .logo {
    font-size: 1rem;
    font-weight: 800;
}

.nav-crumb {
    font-size: 0.78rem;
    color: #94a3b8;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-crumb strong {
    color: var(--text);
}

.crumb-sep {
    opacity: 0.25;
}

.nav-right {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.info-nav-btn {
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: var(--amber);
    padding: 0.32rem 0.9rem;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: 0.2s;
    font-family: inherit;
}

.info-nav-btn:hover {
    background: var(--amber);
    color: #030b14;
}

.back-btn {
    border-radius: 50px;
    padding: 0.32rem 0.9rem;
    font-size: 0.78rem;
    color: #94a3b8;
    border: 1px solid rgba(255, 255, 255, 0.1);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    transition: 0.2s;
}

.back-btn:hover {
    border-color: var(--amber);
    color: var(--amber);
}

/* ── MAIN ───────────────────────────────────────────────── */
.elec-main {
    flex: 1;
    padding: 10px 16px 20px;
    width: 100%;
    max-width: none;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    overflow: hidden;
}

/* ── TOP BANNER ─────────────────────────────────────────── */
.top-banner {
    background: linear-gradient(135deg, rgba(8, 18, 32, 0.95), rgba(245, 158, 11, 0.05));
    border: 1px solid rgba(245, 158, 11, 0.18);
    border-radius: 14px;
    padding: 0.65rem 1.1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.banner-row {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    flex-wrap: nowrap;
}

.label-sm {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    flex-shrink: 0;
}

.electrolyte-pills {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.el-pill {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.25rem 0.65rem;
    border-radius: 30px;
    font-size: 0.7rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    font-family: inherit;
}

.el-pill:hover {
    border-color: var(--amber);
    color: var(--amber);
}

.el-pill.active {
    background: rgba(245, 158, 11, 0.15);
    border-color: var(--amber);
    color: var(--amber);
}

.voltage-wrap {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.voltage-slider {
    -webkit-appearance: none;
    appearance: none;
    height: 5px;
    border-radius: 5px;
    background: linear-gradient(90deg, #f59e0b 0%, rgba(255, 255, 255, 0.1) 100%);
    outline: none;
    cursor: pointer;
    width: 110px;
}

.voltage-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--amber);
    box-shadow: 0 0 8px rgba(245, 158, 11, 0.6);
    cursor: pointer;
}

.voltage-badge {
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: var(--amber);
    padding: 0.15rem 0.6rem;
    border-radius: 20px;
    font-size: 0.72rem;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
}

.equation-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: nowrap;
    font-size: 0.78rem;
}

.eq-cathode {
    color: var(--blue);
}

.eq-cathode strong {
    font-family: 'JetBrains Mono', monospace;
}

.eq-anode {
    color: var(--red);
}

.eq-anode strong {
    font-family: 'JetBrains Mono', monospace;
}

.eq-sep {
    color: var(--muted);
}

/* ── LAYOUT ─────────────────────────────────────────────── */
.elec-layout {
    display: grid;
    grid-template-columns: 220px 1fr 200px;
    gap: 0.65rem;
    flex: 1;
    width: 100%;
    min-height: 0;
    overflow: hidden;
    align-items: stretch;
}

/* ── PANEL ──────────────────────────────────────────────── */
.panel-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 13px;
    padding: 0.8rem 0.9rem;
    backdrop-filter: blur(12px);
    margin-bottom: 0.55rem;
}

.panel-title {
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.7px;
    color: var(--muted);
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-bottom: 0.55rem;
}

.panel-hint {
    font-size: 0.7rem;
    color: #94a3b8;
    line-height: 1.5;
    margin-top: 0.4rem;
}

/* ── POWER BUTTON ───────────────────────────────────────── */
.power-btn {
    width: 100%;
    padding: 0.65rem;
    border-radius: 10px;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.15), rgba(245, 158, 11, 0.08));
    border: 1px solid rgba(245, 158, 11, 0.35);
    color: var(--amber);
    font-size: 0.85rem;
    font-weight: 800;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
    transition: 0.2s;
}

.power-btn:hover {
    background: var(--amber);
    color: #030b14;
}

.power-btn.on {
    background: linear-gradient(135deg, rgba(248, 113, 113, 0.15), rgba(248, 113, 113, 0.08));
    border-color: rgba(248, 113, 113, 0.4);
    color: var(--red);
    animation: pulse-btn 1.5s ease-in-out infinite;
}

.power-btn.on:hover {
    background: var(--red);
    color: #fff;
}

@keyframes pulse-btn {

    0%,
    100% {
        box-shadow: 0 0 0 0 rgba(248, 113, 113, 0.2);
    }

    50% {
        box-shadow: 0 0 0 6px rgba(248, 113, 113, 0);
    }
}

/* ── CONTROLS ───────────────────────────────────────────── */
.control-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.3rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.ctrl-label {
    font-size: 0.7rem;
    color: var(--muted);
}

.ctrl-val {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--text);
}

.mono {
    font-family: 'JetBrains Mono', monospace;
}

/* ── ELECTRODE MATERIAL ─────────────────────────────────── */
.electrode-btns {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
    margin-bottom: 0.5rem;
}

.el-mat-btn {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.32rem 0.6rem;
    border-radius: 7px;
    font-size: 0.73rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.2s;
    font-family: inherit;
    text-align: left;
}

.el-mat-btn:hover {
    color: var(--text);
    border-color: rgba(255, 255, 255, 0.15);
}

.el-mat-btn.active {
    background: rgba(245, 158, 11, 0.1);
    border-color: var(--amber);
    color: var(--amber);
}

/* ── EXPLAIN CARD ───────────────────────────────────────── */
.explain-card {
    background: linear-gradient(135deg, rgba(8, 18, 32, 0.95), rgba(245, 158, 11, 0.05));
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: 13px;
    padding: 0.9rem;
    text-align: center;
}

.explain-icon {
    font-size: 1.8rem;
    margin-bottom: 0.3rem;
}

.explain-title {
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 0.35rem;
}

.explain-body {
    font-size: 0.72rem;
    color: #94a3b8;
    line-height: 1.6;
}

.elec-sidebar {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    overflow-y: auto;
}
.elec-sidebar::-webkit-scrollbar { width: 4px; }
.elec-sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 10px; }

/* ── BEAKER ─────────────────────────────────────────────── */
.elec-center {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    gap: 0.5rem;
}
.elec-center::-webkit-scrollbar { width: 4px; }
.elec-center::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 10px; }

.beaker-wrap {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 0.65rem;
    margin-bottom: 0.6rem;
    backdrop-filter: blur(12px);
    position: relative;
}

.beaker-header {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    margin-bottom: 0.5rem;
    flex-wrap: nowrap;
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--muted);
}

.ion-dot {
    display: inline-block;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    margin-right: 0.3rem;
}

.cation-dot {
    background: var(--green);
}

.anion-dot {
    background: var(--red);
}

.power-status {
    margin-left: auto;
    font-size: 0.68rem;
    font-weight: 800;
    padding: 0.15rem 0.55rem;
    border-radius: 20px;
    background: rgba(100, 116, 139, 0.1);
    color: var(--muted);
    transition: all 0.3s;
}

.power-status.on {
    background: rgba(74, 222, 128, 0.12);
    color: var(--green);
    animation: blink-status 1s step-end infinite;
}

@keyframes blink-status {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.4;
    }
}

#beaker-canvas {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 10px;
}

.deposit-labels {
    position: absolute;
    top: 40%;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0 14px;
    pointer-events: none;
}

.dep-label {
    font-size: 0.7rem;
    font-weight: 800;
    padding: 0.2rem 0.5rem;
    border-radius: 8px;
    backdrop-filter: blur(6px);
}

.cathode-dep {
    background: rgba(56, 189, 248, 0.15);
    color: var(--blue);
    border: 1px solid rgba(56, 189, 248, 0.25);
}

.anode-dep {
    background: rgba(248, 113, 113, 0.15);
    color: var(--red);
    border: 1px solid rgba(248, 113, 113, 0.25);
}

/* ── PRODUCTS PANEL ─────────────────────────────────────── */
.product-panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 13px;
    padding: 0.7rem 0.85rem;
    margin-bottom: 0.6rem;
    backdrop-filter: blur(12px);
}

.product-title {
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--muted);
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.product-rows {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.product-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.prod-label {
    font-size: 0.7rem;
    font-weight: 700;
    min-width: 90px;
}

.prod-bar-track {
    flex: 1;
    height: 9px;
    background: rgba(255, 255, 255, 0.04);
    border-radius: 5px;
    overflow: hidden;
}

.prod-bar-fill {
    height: 100%;
    border-radius: 5px;
    transition: width 0.5s ease;
}

.prod-num {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text);
    min-width: 60px;
    text-align: right;
}

/* ── CIRCUIT PANEL ──────────────────────────────────────── */
.circuit-panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 13px;
    padding: 0.7rem 0.85rem;
    backdrop-filter: blur(12px);
}

.circuit-title {
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--muted);
    margin-bottom: 0.5rem;
}

.circuit-svg-wrap svg {
    width: 100%;
    height: auto;
}

/* ── FARADAY PANEL ──────────────────────────────────────── */
.faraday-formula {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--amber);
    font-family: 'JetBrains Mono', monospace;
    text-align: center;
    padding: 0.5rem;
    margin-bottom: 0.6rem;
    background: rgba(245, 158, 11, 0.06);
    border: 1px solid rgba(245, 158, 11, 0.15);
    border-radius: 8px;
}

.faraday-formula .mono {
    color: var(--cyan);
}

.faraday-rows {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.far-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.7rem;
    padding: 0.25rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.far-row.sep {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    margin-top: 0.2rem;
    padding-top: 0.4rem;
}

.far-lbl {
    color: var(--muted);
}

.far-val {
    font-weight: 700;
    color: var(--text);
}

.far-val.highlight {
    color: var(--green);
    font-size: 0.78rem;
}

/* ── ION ROWS ───────────────────────────────────────────── */
.ion-rows {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.ion-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.72rem;
}

.ion-badge {
    padding: 0.15rem 0.5rem;
    border-radius: 20px;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.68rem;
    flex-shrink: 0;
}

.ion-badge.cat {
    background: rgba(74, 222, 128, 0.12);
    color: var(--green);
    border: 1px solid rgba(74, 222, 128, 0.2);
}

.ion-badge.an {
    background: rgba(248, 113, 113, 0.12);
    color: var(--red);
    border: 1px solid rgba(248, 113, 113, 0.2);
}

.ion-info {
    color: #94a3b8;
    line-height: 1.4;
}

.ion-dest {
    color: var(--text);
    font-weight: 700;
    margin-left: auto;
    font-size: 0.65rem;
}

/* ── LIVE READINGS ──────────────────────────────────────── */
.reading-rows {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.read-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.7rem;
    padding: 0.25rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.read-lbl {
    color: var(--muted);
}

.read-val {
    font-weight: 700;
}

.read-val.amber {
    color: var(--amber);
}

.read-val.green {
    color: var(--green);
}

.read-val.red {
    color: var(--red);
}

.elec-readings {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}
.elec-readings::-webkit-scrollbar { width: 4px; }
.elec-readings::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 10px; }

/* ── MODAL ──────────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(3, 11, 20, 0.9);
    backdrop-filter: blur(12px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    animation: mfade 0.2s ease;
}

.modal-overlay.hidden {
    display: none;
}

@keyframes mfade {
    from {
        opacity: 0
    }

    to {
        opacity: 1
    }
}

.modal-box {
    background: linear-gradient(145deg, #0a1525, #05101c);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: 22px;
    padding: 1.4rem;
    width: 100%;
    max-width: 620px;
    max-height: 88vh;
    overflow-y: auto;
    position: relative;
    box-shadow: 0 35px 90px rgba(0, 0, 0, 0.7);
    animation: mslide 0.28s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes mslide {
    from {
        transform: translateY(22px);
        opacity: 0
    }

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

.modal-close {
    position: absolute;
    top: 0.85rem;
    right: 0.85rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border);
    color: var(--muted);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: 0.2s;
    font-size: 0.76rem;
}

.modal-close:hover {
    background: var(--red);
    color: #fff;
    border-color: var(--red);
}

.modal-header {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    margin-bottom: 0.9rem;
}

.modal-icon {
    font-size: 2.2rem;
}

.modal-title {
    font-size: 1rem;
    font-weight: 800;
    color: var(--text);
}

.modal-sub {
    font-size: 0.7rem;
    color: var(--muted);
}

.learn-tabs {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
    margin-bottom: 0.9rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.6rem;
}

.learn-tab {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--muted);
    padding: 0.22rem 0.65rem;
    border-radius: 7px;
    font-size: 0.72rem;
    font-weight: 700;
    cursor: pointer;
    transition: 0.18s;
    font-family: inherit;
}

.learn-tab:hover {
    color: var(--amber);
    border-color: var(--amber);
}

.learn-tab.active {
    background: var(--amber);
    border-color: var(--amber);
    color: #030b14;
}

.learn-section {
    display: none;
}

.learn-section.active {
    display: block;
}

.learn-highlight {
    background: rgba(245, 158, 11, 0.07);
    border-left: 3px solid var(--amber);
    border-radius: 7px;
    padding: 0.75rem 0.9rem;
    font-size: 0.8rem;
    color: #fcd34d;
    font-style: italic;
    line-height: 1.6;
    margin-bottom: 0.9rem;
}

.learn-formula {
    background: rgba(56, 189, 248, 0.06);
    border: 1px solid rgba(56, 189, 248, 0.18);
    border-radius: 9px;
    padding: 0.75rem;
    font-size: 1.15rem;
    font-weight: 800;
    text-align: center;
    color: var(--cyan);
    font-family: 'JetBrains Mono', monospace;
    margin-bottom: 0.9rem;
}

.learn-steps {
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.learn-step {
    display: flex;
    gap: 0.65rem;
    font-size: 0.78rem;
    color: #94a3b8;
    line-height: 1.6;
}

.learn-step strong {
    color: var(--text);
}

.ls-num {
    background: rgba(245, 158, 11, 0.12);
    color: var(--amber);
    border-radius: 50%;
    width: 26px;
    height: 26px;
    min-width: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.64rem;
    font-weight: 800;
}