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

/* ── ROOT ──────────────────────────────────────────────── */
:root {
    --bg: #050a14;
    --panel: rgba(13, 21, 38, 0.88);
    --border: rgba(255, 255, 255, 0.07);
    --accent-purple: #a855f7;
    --accent-cyan: #22d3ee;
    --accent-green: #4ade80;
    --accent-amber: #f59e0b;
    --accent-red: #f87171;
    --accent-blue: #3b82f6;
    --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;
}

#bgCanvas {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    background: radial-gradient(circle at 15% 20%, #0a1122 0%, #050a14 100%);
}

html, body {
    background-color: #050a14 !important;
}

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

body.eq-page::before {
    content: '';
    position: fixed; inset: 0;
    background:
        radial-gradient(ellipse 70% 50% at 15% 20%, rgba(168,85,247,0.06) 0%, transparent 65%),
        radial-gradient(ellipse 60% 60% at 85% 70%, rgba(34,211,238,0.05) 0%, transparent 65%),
        radial-gradient(ellipse 80% 40% at 50% 100%, rgba(74,222,128,0.04) 0%, transparent 65%);
    pointer-events: none; z-index: 0;
}

/* ── NAV ───────────────────────────────────────────────── */
.eq-nav {
    position: relative;
    display: flex; align-items: center; justify-content: space-between;
    padding: 0.55rem 1.4rem;
    background: rgba(5,10,20,0.92);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}
.eq-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(168,85,247,0.12); border: 1px solid rgba(168,85,247,0.3);
    color: var(--accent-purple); 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(--accent-purple); color: #fff; }
.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(--accent-purple); color: var(--accent-purple); }

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

/* ── REACTION BANNER ────────────────────────────────────── */
.reaction-banner {
    background: linear-gradient(135deg, rgba(13,21,38,0.92), rgba(168,85,247,0.05));
    border: 1px solid rgba(168,85,247,0.18); border-radius: 14px;
    padding: 0.65rem 1.1rem; display: flex; flex-direction: column; gap: 0.5rem;
}
.reaction-selector-row {
    display: flex; align-items: center; gap: 0.6rem; 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; }
.rx-pills { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.rx-pill {
    background: rgba(255,255,255,0.04); border: 1px solid var(--border);
    color: var(--muted); padding: 0.24rem 0.65rem; border-radius: 30px;
    font-size: 0.7rem; font-weight: 700; cursor: pointer; transition: 0.2s; font-family: inherit;
}
.rx-pill:hover { border-color: var(--accent-purple); color: var(--accent-purple); }
.rx-pill.active { background: rgba(168,85,247,0.18); border-color: var(--accent-purple); color: var(--accent-purple); }
.mode-row { display: flex; gap: 0.3rem; flex-wrap: wrap; margin-left: auto; }
.mode-btn {
    background: rgba(255,255,255,0.04); border: 1px solid var(--border);
    color: var(--muted); padding: 0.24rem 0.65rem; border-radius: 8px;
    font-size: 0.7rem; font-weight: 700; cursor: pointer; transition: 0.2s; font-family: inherit;
}
.mode-btn:hover { color: var(--text); border-color: rgba(255,255,255,0.15); }
.mode-btn.active { background: rgba(34,211,238,0.12); border-color: var(--accent-cyan); color: var(--accent-cyan); }
.reaction-eq {
    font-size: 1rem; font-weight: 700; color: var(--text);
    font-family: 'Space Grotesk', sans-serif; letter-spacing: 0.2px;
}

/* ── SHIFT ARROW BANNER (Feature 8) ────────────────────── */
.shift-arrow-banner {
    border: 1px solid rgba(245,158,11,0.25);
    border-radius: 12px; padding: 0.65rem 1rem;
    background: rgba(13,21,38,0.85);
    backdrop-filter: blur(10px);
    transition: opacity 0.5s;
}
.sab-inner { display: flex; align-items: center; gap: 0.8rem; flex-wrap: nowrap; }
.sab-stress { font-size: 0.74rem; font-weight: 800; color: var(--accent-amber); flex-shrink: 0; }
.sab-arrow-wrap {
    display: flex; align-items: center; gap: 0.5rem; flex: 1; min-width: 220px;
}
.sab-rev, .sab-fwd { font-size: 0.65rem; font-weight: 700; color: var(--muted); flex-shrink: 0; }
.sab-arrow-track {
    flex: 1; height: 10px; background: rgba(255,255,255,0.05);
    border-radius: 5px; position: relative; overflow: hidden;
}
.sab-arrow-fill {
    position: absolute; top: 0; bottom: 0;
    border-radius: 5px; transition: all 0.5s ease;
}
.sab-center-mark {
    position: absolute; top: 0; bottom: 0; left: 50%; width: 2px;
    background: rgba(255,255,255,0.15); transform: translateX(-50%);
}
.sab-label { font-size: 0.75rem; font-weight: 700; flex-shrink: 0; }

/* ── LAYOUT ─────────────────────────────────────────────── */
.eq-layout {
    display: grid;
    grid-template-columns: 240px 1fr 210px;
    gap: 0.65rem;
    flex: 1;
    width: 100%;
    min-height: 0;
    overflow: hidden;
}

/* ── 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-bottom: 0.7rem; }

/* ── STRESS CONTROLS ────────────────────────────────────── */
.stress-section { margin-bottom: 0.7rem; }
.stress-head {
    font-size: 0.65rem; font-weight: 800; color: var(--muted); text-transform: uppercase;
    letter-spacing: 0.5px; margin-bottom: 0.35rem; display: flex; align-items: center; gap: 0.4rem;
}
.temp-badge {
    background: rgba(245,158,11,0.12); border: 1px solid rgba(245,158,11,0.25);
    color: var(--accent-amber); padding: 1px 7px; border-radius: 20px;
    font-size: 0.62rem; font-family: 'JetBrains Mono', monospace; font-weight: 700; margin-left: auto;
}
.stress-btns { display: flex; flex-direction: column; gap: 0.28rem; }
.stress-btn {
    display: flex; align-items: center; gap: 0.45rem;
    padding: 0.4rem 0.7rem; border-radius: 8px; font-size: 0.75rem; font-weight: 700;
    cursor: pointer; border: 1px solid transparent; font-family: inherit; transition: all 0.18s;
    width: 100%; text-align: left;
}
.stress-btn.reactant   { background:rgba(74,222,128,0.08);border-color:rgba(74,222,128,0.25);color:var(--accent-green); }
.stress-btn.reactant:hover { background:var(--accent-green);color:#050a14; }
.stress-btn.product    { background:rgba(168,85,247,0.08);border-color:rgba(168,85,247,0.25);color:var(--accent-purple); }
.stress-btn.product:hover  { background:var(--accent-purple);color:#fff; }
.stress-btn.reactant-rm{ background:rgba(74,222,128,0.04);border-color:rgba(74,222,128,0.14);color:#86efac; }
.stress-btn.reactant-rm:hover{ background:rgba(74,222,128,0.14); }
.stress-btn.product-rm { background:rgba(168,85,247,0.04);border-color:rgba(168,85,247,0.14);color:#d8b4fe; }
.stress-btn.product-rm:hover { background:rgba(168,85,247,0.14); }
.stress-btn.heat  { background:rgba(249,115,22,0.09);border-color:rgba(249,115,22,0.28);color:#fb923c; }
.stress-btn.heat:hover  { background:#f97316;color:#fff; }
.stress-btn.cool  { background:rgba(59,130,246,0.09);border-color:rgba(59,130,246,0.28);color:var(--accent-blue); }
.stress-btn.cool:hover  { background:var(--accent-blue);color:#fff; }
.stress-btn.pressure { background:rgba(34,211,238,0.07);border-color:rgba(34,211,238,0.22);color:var(--accent-cyan); }
.stress-btn.pressure:hover { background:var(--accent-cyan);color:#050a14; }

/* ── THERMOMETER (Feature 3) ────────────────────────────── */
.thermo-wrap {
    display: flex; align-items: center; gap: 0.4rem; margin-top: 0.4rem;
}
.thermo-bar-track {
    flex: 1; height: 5px; background: rgba(255,255,255,0.05); border-radius: 3px; overflow: hidden;
}
.thermo-bar-fill {
    height: 100%; border-radius: 3px;
    background: linear-gradient(90deg, #3b82f6, #f97316, #ef4444);
    transition: width 0.4s ease;
}
.thermo-label { font-size: 0.58rem; color: var(--muted); font-family: 'JetBrains Mono',monospace; }

/* ── RESET / STEP BUTTONS ───────────────────────────────── */
.reset-btn, .step-advance-btn {
    flex: 1; padding: 0.45rem 0.5rem;
    border-radius: 8px; border: 1px solid var(--border);
    font-size: 0.75rem; font-weight: 700; cursor: pointer;
    font-family: inherit; transition: 0.18s;
    display: flex; align-items: center; justify-content: center; gap: 0.35rem;
}
.reset-btn { background:rgba(255,255,255,0.04);color:var(--muted); }
.reset-btn:hover { border-color:var(--accent-purple);color:var(--accent-purple); }
.step-advance-btn { background:rgba(245,158,11,0.1);color:var(--accent-amber);border-color:rgba(245,158,11,0.3); }
.step-advance-btn:hover { background:var(--accent-amber);color:#050a14; }

/* ── EXPLAIN CARD ───────────────────────────────────────── */
.explain-card {
    background: linear-gradient(135deg, rgba(13,21,38,0.92), rgba(168,85,247,0.05));
    border: 1px solid rgba(168,85,247,0.22); border-radius: 13px;
    padding: 0.9rem; text-align: center; transition: all 0.4s ease; margin-bottom: 0.55rem;
}
.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; }
.explain-shift {
    margin-top: 0.5rem; padding: 0.35rem 0.7rem; border-radius: 7px;
    font-size: 0.75rem; font-weight: 800;
}
.explain-card.shift-fwd { border-color: rgba(74,222,128,0.38); }
.explain-card.shift-rev { border-color: rgba(168,85,247,0.45); }
.explain-card.shift-fwd .explain-shift { background:rgba(74,222,128,0.1);color:var(--accent-green); }
.explain-card.shift-rev .explain-shift { background:rgba(168,85,247,0.1);color:var(--accent-purple); }

/* ── STEP LOG (Feature 10) ──────────────────────────────── */
.step-log-panel {
    background: var(--panel); border: 1px solid var(--border);
    border-radius: 13px; padding: 0.7rem 0.8rem; margin-bottom: 0.55rem;
}
.step-log {
    max-height: 130px; overflow-y: auto;
    display: flex; flex-direction: column; gap: 0.2rem;
}
.step-log::-webkit-scrollbar { width: 3px; } .step-log::-webkit-scrollbar-thumb { background: #334155; }
.step-log-item {
    font-size: 0.63rem; color: #94a3b8; font-family: 'JetBrains Mono', monospace;
    padding: 0.18rem 0.4rem; border-radius: 4px; background: rgba(255,255,255,0.02);
}
.step-log-t { color: var(--muted); margin-right: 0.4rem; }

/* ── CANVAS WRAPPER ─────────────────────────────────────── */
.canvas-outer-wrap {
    background: var(--panel); border: 1px solid var(--border);
    border-radius: 14px; padding: 0.65rem; margin-bottom: 0.6rem;
    backdrop-filter: blur(12px); overflow: hidden;
    flex-shrink: 0;
}
.canvas-header-row {
    display: flex; align-items: center; gap: 0.5rem;
    flex-wrap: nowrap; margin-bottom: 0.5rem;
}
.canvas-legend {
    display: flex; align-items: center; gap: 0.35rem;
    font-size: 0.7rem; color: var(--muted); font-weight: 700;
}
/* Feature 9: Particle Count Badges */
.particle-counts {
    display: flex; gap: 0.35rem; margin-left: 0.5rem;
}
.pc-item {
    font-size: 0.65rem; font-weight: 800; padding: 0.15rem 0.55rem;
    border-radius: 20px; font-family: 'JetBrains Mono', monospace;
}
.reactant-count-badge { background:rgba(74,222,128,0.1);color:var(--accent-green);border:1px solid rgba(74,222,128,0.25); }
.product-count-badge  { background:rgba(168,85,247,0.1);color:var(--accent-purple);border:1px solid rgba(168,85,247,0.25); }
.canvas-status {
    margin-left: auto; background:rgba(74,222,128,0.12); color:var(--accent-green);
    border: 1px solid rgba(74,222,128,0.2); border-radius: 20px; padding: 0.16rem 0.55rem;
    font-size: 0.66rem; font-weight: 800; transition: all 0.3s;
}
.dot, .cl-dot {
    display: inline-block; width: 8px; height: 8px; border-radius: 50%;
}
.reactant-dot { background:#4ade80; }
.product-dot  { background:#a855f7; }
.qk-dot       { background:#f59e0b; }

/* Feature 4: pressure container viewport */
.container-viewport {
    position: relative; width: 100%; overflow: hidden;
    border-radius: 10px; background: rgba(2,6,23,0.7);
    transition: all 0.4s ease;
}
.reaction-container {
    display: flex; align-items: center; justify-content: center;
    transition: all 0.5s ease;
}
#sim-canvas {
    display: block; width: 100%; height: auto;
    border-radius: 10px;
}
.pressure-walls {
    position: absolute; inset: 0; border: 4px solid var(--accent-cyan);
    border-radius: 10px; pointer-events: none; transition: opacity 0.3s;
    box-shadow: inset 0 0 20px rgba(34,211,238,0.15);
}

/* ── RATE BARS (Feature 2) ──────────────────────────────── */
.rate-panel {
    background: var(--panel); border: 1px solid var(--border);
    border-radius: 14px; padding: 0.65rem 0.8rem; margin-bottom: 0.6rem;
    backdrop-filter: blur(12px);
}
.rate-title {
    font-size: 0.7rem; font-weight: 800; color: var(--muted); text-transform: uppercase;
    letter-spacing: 0.6px; margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.35rem;
}
.rate-rows { display: flex; flex-direction: column; gap: 0.35rem; }
.rate-row { display: flex; align-items: center; gap: 0.45rem; }
.rate-label { font-size: 0.68rem; font-weight: 800; min-width: 60px; }
.fwd-label { color: var(--accent-green); }
.rev-label { color: var(--accent-purple); }
.rate-bar-track {
    flex: 1; height: 9px; background: rgba(255,255,255,0.05);
    border-radius: 5px; position: relative; overflow: hidden;
}
.rate-bar-fill {
    height: 100%; border-radius: 5px; transition: width 0.35s ease;
    position: relative; z-index: 1;
}
.fwd-bar { background: linear-gradient(90deg, #4ade80, #22d3ee); }
.rev-bar { background: linear-gradient(90deg, #a855f7, #ec4899); }
.rate-bar-glow {
    position: absolute; inset: 0; border-radius: 5px; pointer-events: none;
    animation: rateGlow 1.2s ease-in-out infinite alternate;
}
.fwd-glow { background: rgba(74,222,128,0.2); }
.rev-glow { background: rgba(168,85,247,0.2); }
@keyframes rateGlow { from { opacity: 0.3; } to { opacity: 0.8; } }
.rate-num {
    font-family: 'JetBrains Mono', monospace; font-size: 0.68rem;
    font-weight: 700; color: var(--text); min-width: 30px; text-align: right;
}
.rate-eq-line {
    text-align: center; font-size: 0.72rem; font-weight: 700;
    color: var(--accent-green); margin-top: 0.2rem;
}

/* ── ENERGY PANEL (Feature 7) ───────────────────────────── */
.energy-panel {
    background: var(--panel); border: 1px solid rgba(245,158,11,0.18);
    border-radius: 14px; padding: 0.65rem 0.8rem; margin-bottom: 0.6rem;
    backdrop-filter: blur(12px);
}
.energy-legend { display: flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; margin-top: 0.4rem; }
.el-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; }
.energy-legend span { font-size: 0.66rem; color: var(--muted); }

/* ── CHART AREA ─────────────────────────────────────────── */
.chart-area {
    background: var(--panel); border: 1px solid var(--border);
    border-radius: 14px; padding: 0.65rem 0.8rem;
    backdrop-filter: blur(12px);
}
.chart-title {
    font-size: 0.7rem; font-weight: 800; color: var(--muted);
    margin-bottom: 0.45rem; text-transform: uppercase; letter-spacing: 0.5px;
}
#chart-canvas, #energy-canvas { display: block; width: 100%; height: auto; border-radius: 7px; }
.chart-legend {
    display: flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; margin-top: 0.45rem;
}
.cl-label { font-size: 0.66rem; color: var(--muted); }

/* ── Q/K DISPLAY ────────────────────────────────────────── */
.qk-display {
    display: flex; align-items: center; justify-content: center;
    gap: 0.6rem; margin-bottom: 0.6rem;
}
.qk-item { text-align: center; }
.qk-label { font-size: 0.63rem; font-weight: 800; color: var(--muted); text-transform: uppercase; }
.qk-val {
    font-family: 'JetBrains Mono', monospace; font-size: 1.3rem;
    font-weight: 700; color: var(--text); transition: color 0.3s;
}
.qk-sub { font-size: 0.56rem; color: var(--muted); }
.qk-sep { font-size: 0.72rem; font-weight: 800; color: var(--muted); }
.qk-verdict {
    text-align: center; font-size: 0.7rem; font-weight: 800;
    padding: 0.28rem 0.55rem; border-radius: 6px; margin-bottom: 0.6rem;
    background: rgba(74,222,128,0.08); color: var(--accent-green); transition: all 0.3s;
}
.qk-verdict.forward { background:rgba(74,222,128,0.14); }
.qk-verdict.reverse { background:rgba(168,85,247,0.14); color:var(--accent-purple); }
.qk-bar-track {
    width: 100%; height: 7px; background: rgba(255,255,255,0.05);
    border-radius: 4px; position: relative; overflow: hidden; margin-bottom: 0.28rem;
}
.qk-bar-fill {
    position: absolute; top: 0; bottom: 0; left: 50%; width: 0;
    border-radius: 4px; background: var(--accent-green); transition: all 0.55s ease;
}
.qk-bar-mid {
    position: absolute; top: 0; bottom: 0; left: 50%; width: 2px;
    background: rgba(255,255,255,0.13); transform: translateX(-50%);
}
.qk-bar-labels {
    display: flex; justify-content: space-between; font-size: 0.54rem; color: var(--muted);
}

/* ── CONCENTRATIONS ─────────────────────────────────────── */
.conc-rows { display: flex; flex-direction: column; gap: 0.38rem; }
.conc-row { display: flex; align-items: center; gap: 0.45rem; }
.conc-label {
    font-size: 0.68rem; font-weight: 700; color: var(--muted);
    min-width: 48px; font-family: 'JetBrains Mono', monospace;
}
.conc-bar-track {
    flex: 1; height: 9px; background: rgba(255,255,255,0.04); border-radius: 5px; overflow: hidden;
}
.conc-bar-fill { height: 100%; border-radius: 5px; transition: width 0.5s cubic-bezier(0.34,1.56,0.64,1); }
.conc-num {
    font-family: 'JetBrains Mono', monospace; font-size: 0.68rem;
    font-weight: 700; color: var(--text); min-width: 36px; text-align: right;
}

/* ── CONDITIONS ─────────────────────────────────────────── */
.cond-rows { display: flex; flex-direction: column; gap: 0.42rem; }
.cond-row { display: flex; align-items: center; gap: 0.45rem; }
.cond-icon { font-size: 0.85rem; }
.cond-label { font-size: 0.68rem; color: var(--muted); flex: 1; }
.cond-val { font-family: 'JetBrains Mono', monospace; font-size: 0.68rem; font-weight: 700; color: var(--text); }

/* ── SIDEBAR / CENTER / READINGS ────────────────────────── */
.eq-sidebar {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}
.eq-sidebar::-webkit-scrollbar { width: 6px; }
.eq-sidebar::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 10px; }

.eq-readings {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    flex: 1;
    min-height: 0;
}
.eq-readings::-webkit-scrollbar { width: 6px; }
.eq-readings::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 10px; }

.eq-center {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    gap: 0.5rem;
    flex: 1;
    min-height: 0;
}
.eq-center::-webkit-scrollbar { width: 8px; }
.eq-center::-webkit-scrollbar-thumb { background: rgba(168,85,247,0.25); border-radius: 10px; border: 2px solid var(--bg); }

/* ── INFO MODAL ─────────────────────────────────────────── */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(3, 7, 18, 0.95); 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, #0d1526, #060e1c);
    border: 1px solid rgba(168,85,247,0.22); 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(--accent-red); color: #fff; border-color: var(--accent-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(--accent-purple); border-color: var(--accent-purple); }
.learn-tab.active { background: var(--accent-purple); border-color: var(--accent-purple); color: #fff; }
.learn-section { display: none; } .learn-section.active { display: block; }
.learn-highlight {
    background: rgba(168,85,247,0.08); border-left: 3px solid var(--accent-purple);
    border-radius: 7px; padding: 0.75rem 0.9rem; font-size: 0.8rem;
    color: #c4b5fd; font-style: italic; line-height: 1.6; margin-bottom: 0.9rem;
}
.learn-formula {
    background: rgba(34,211,238,0.06); border: 1px solid rgba(34,211,238,0.18);
    border-radius: 9px; padding: 0.75rem; font-size: 1.1rem; font-weight: 700;
    text-align: center; color: var(--accent-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); } .learn-step em { color: var(--accent-purple); font-style: normal; }
.ls-num {
    background: rgba(168,85,247,0.12); color: var(--accent-purple); border-radius: 50%;
    width: 24px; height: 24px; min-width: 24px;
    display: flex; align-items: center; justify-content: center; font-size: 0.65rem; font-weight: 800;
}
.stress-table { display: flex; flex-direction: column; gap: 0.28rem; }
.st-row {
    display: grid; grid-template-columns: 1fr 1fr auto; gap: 0.4rem;
    font-size: 0.72rem; padding: 0.45rem 0.55rem; border-radius: 7px; align-items: center;
}
.st-row.header { font-weight: 800; color: var(--muted); font-size: 0.63rem; background: rgba(255,255,255,0.03); }
.st-row:not(.header) { background: rgba(255,255,255,0.02); color: #94a3b8; }
.fwd { color: var(--accent-green); font-weight: 700; }
.rev { color: var(--accent-purple); font-weight: 700; }
.ctx { color: var(--accent-amber); font-weight: 700; }