body {
    background: var(--bg);
    color: var(--text);
}

#canvas {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    display: block;
}

.glass {
    background: var(--surface);
    backdrop-filter: blur(16px) saturate(1.4);
    -webkit-backdrop-filter: blur(16px) saturate(1.4);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.screen {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    padding: 24px;
    transition: opacity .4s var(--ease-out), transform .4s var(--ease-out);
}

.screen.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.97);
}

.math-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.math-sym {
    position: absolute;
    font-family: var(--font-num);
    font-weight: 700;
    opacity: .14;
    animation-name: symbolFloat;
    animation-timing-function: ease-in-out;
    animation-iteration-count: infinite;
    will-change: transform;
    user-select: none;
}

.math-sym.c-indigo { color: var(--indigo); }
.math-sym.c-cyan { color: var(--cyan); }
.math-sym.c-jade { color: var(--jade); }
.math-sym.c-gold { color: var(--gold); }
.math-sym.c-coral { color: var(--coral); }

.hero-shell {
    width: min(100%, 960px);
    padding: clamp(24px, 4vw, 40px);
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: relative;
}

.hero-wrap {
    width: min(100%, 1360px);
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: relative;
    z-index: 1;
}

.hero-menu-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
}

.menu-bar-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 10px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-family: var(--font-ui);
    font-size: .85rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: calc(var(--radius) - 4px);
    transition: color .15s, background .15s;
    white-space: nowrap;
}

.menu-bar-btn:hover {
    color: var(--text);
    background: var(--surface2);
}

.menu-bar-btn .icon {
    font-size: 1rem;
}

.menu-bar-divider {
    width: 1px;
    align-self: stretch;
    margin: 6px 0;
    background: var(--border);
}

.hero-main {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 64px;
    align-items: start;
}

.hero-copy {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.hero-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 22px;
    text-align: center;
}

.session-block,
.stats-block {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.panel-label {
    font-size: .78rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: .16em;
    font-weight: 700;
}

.panel-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 0;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.hero-stat {
    padding: 14px 10px;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, .05);
    border: 1px solid var(--border);
    text-align: center;
}

.hero-stat-icon {
    display: block;
    font-size: 1.4rem;
    margin-bottom: 6px;
}

.hero-stat b {
    display: block;
    font-family: var(--font-num);
    font-size: 1.35rem;
    color: var(--text);
}

.hero-stat span {
    display: block;
    margin-top: 4px;
    font-size: .64rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: .06em;
}