:root {
    --font-body: 'Satoshi', system-ui, sans-serif;
    --text-xs: clamp(0.75rem, 0.72rem + 0.2vw, 0.875rem);
    --text-sm: clamp(0.875rem, 0.84rem + 0.2vw, 1rem);
    --text-base: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
    --text-lg: clamp(1.125rem, 1rem + 0.6vw, 1.5rem);
    --text-xl: clamp(1.6rem, 1.3rem + 1vw, 2.2rem);
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --radius-sm: 0.875rem;
    --radius-md: 1.25rem;
    --radius-lg: 1.75rem;
    --radius-full: 999px;
    --bg: #ffffff;
    --surface: #ffffff;
    --surface-soft: #f7fbff;
    --surface-blue: #eef7ff;
    --text: #17324a;
    --muted: #5c768f;
    --border: #d9e9f7;
    --blue: #73cfff;
    --mint: #8cf0cf;
    --pink: #ff8fc6;
    --yellow: #ffe37d;
    --purple: #c4a8ff;
    --red: #ffb1b1;
    --shadow: 0 18px 50px rgba(116, 156, 201, 0.14);
}

* {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    min-height: 100dvh;
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(115, 207, 255, 0.18), transparent 30%),
        radial-gradient(circle at top right, rgba(255, 143, 198, 0.18), transparent 30%),
        linear-gradient(180deg, #ffffff 0%, #f9fcff 100%);
}

button {
    font: inherit;
}

a {
    color: inherit;
}

.skip-link {
    position: absolute;
    left: -9999px;
}

.skip-link:focus {
    left: 1rem;
    top: 1rem;
    background: #fff;
    padding: 0.75rem 1rem;
    border-radius: 999px;
    z-index: 50;
}

.page-shell {
    width: min(100%, 980px);
    margin: 0 auto;
    padding: max(1rem, env(safe-area-inset-top)) 1rem calc(2rem + env(safe-area-inset-bottom));
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-4) 0 var(--space-5);
}

.brand-wrap {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.logo-badge {
    display: grid;
    place-items: center;
    width: 58px;
    height: 58px;
    border-radius: 22px;
    background: linear-gradient(135deg, var(--yellow), var(--blue), var(--pink));
    box-shadow: var(--shadow);
    font-size: 1.8rem;
}

h1,
h2,
h3,
p {
    margin: 0;
}

h1 {
    font-size: var(--text-lg);
}

h2 {
    font-size: var(--text-xl);
    line-height: 1.05;
}

h3 {
    font-size: var(--text-lg);
}

.eyebrow {
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 800;
    color: var(--muted);
}

.main-grid {
    display: grid;
    gap: var(--space-4);
}

.card {
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: var(--space-5);
    backdrop-filter: blur(12px);
}

.hero-card {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: var(--space-4);
}

.hero-copy,
.hero-visual,
.section-head,
.stack-item,
.level-card,
.action-card,
.access-highlight {
    display: grid;
}

.hero-copy {
    gap: var(--space-3);
    align-content: center;
}

.hero-message,
.section-note,
.stack-copy,
.level-copy,
.level-meta,
.access-highlight p {
    color: var(--muted);
}

.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

.stat-pill,
.pill-btn,
.badge-chip,
.stack-time,
.history-delta {
    border-radius: var(--radius-full);
}

.stat-pill {
    display: inline-flex;
    flex-direction: column;
    gap: 0.15rem;
    padding: 0.8rem 1rem;
    background: var(--surface-soft);
    min-width: 110px;
}

.stat-label {
    font-size: var(--text-xs);
    color: var(--muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.hero-visual {
    gap: var(--space-4);
    align-content: center;
}

.orbital-ring {
    width: min(100%, 230px);
    aspect-ratio: 1;
    margin-inline: auto;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: radial-gradient(circle at 30% 30%, #ffffff, #e3f6ff 62%, #ffe7f3 100%);
    box-shadow: inset 0 0 0 10px rgba(255, 255, 255, 0.7), 0 20px 40px rgba(118, 169, 222, 0.18);
}

.orbital-core {
    width: 58%;
    aspect-ratio: 1;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: #fff;
    font-size: 4rem;
    box-shadow: 0 14px 30px rgba(118, 169, 222, 0.18);
}

.meter-block {
    display: grid;
    gap: var(--space-2);
}

.meter-track {
    height: 18px;
    background: #e7f2fb;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.meter-fill {
    width: 58%;
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--mint), var(--blue), var(--pink));
    transition: width 180ms ease;
}

.meter-scale {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-sm);
    color: var(--muted);
}

.section-head {
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.action-grid,
.levels-grid,
.split-grid {
    display: grid;
    gap: var(--space-3);
}

.action-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.action-card {
    min-height: 104px;
    padding: var(--space-4);
    text-align: left;
    border: none;
    border-radius: var(--radius-md);
    gap: var(--space-1);
    box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.04);
    cursor: pointer;
}

.action-card:active {
    transform: translateY(1px);
}

.action-good {
    background: #eafff5;
}

.action-warn {
    background: #fff6d8;
}

.action-bad {
    background: #ffe8e8;
}

.action-emoji {
    font-size: 1.8rem;
}

.action-title {
    font-weight: 800;
}

.action-copy {
    color: var(--muted);
    font-size: var(--text-sm);
}

.split-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stack-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: var(--space-3);
}

.stack-item {
    grid-template-columns: auto 1fr;
    gap: var(--space-3);
    align-items: start;
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: var(--surface-soft);
}

.stack-time {
    padding: 0.45rem 0.75rem;
    background: #fff1c8;
    font-size: var(--text-xs);
    font-weight: 800;
}

.stack-title {
    font-weight: 800;
    margin-bottom: 0.2rem;
}

.access-highlight {
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, #eef8ff, #fff5fb);
}

.access-highlight h4 {
    margin: 0;
    font-size: var(--text-lg);
}

.access-highlight ul {
    margin: 0;
    padding-left: 1.1rem;
    color: var(--muted);
}

.levels-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.level-card {
    gap: var(--space-3);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    background: linear-gradient(180deg, #ffffff, #f8fbff);
    border: 1px solid var(--border);
}

.level-card.active {
    outline: 3px solid rgba(115, 207, 255, 0.3);
    background: linear-gradient(180deg, #ffffff, #eef8ff);
}

.level-topline {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
}

.level-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.45rem 0.8rem;
    background: var(--surface-blue);
    border-radius: var(--radius-full);
    font-weight: 800;
}

.level-copy ul {
    margin: 0.6rem 0 0;
    padding-left: 1rem;
    color: var(--muted);
}

.history-list .stack-item {
    grid-template-columns: auto 1fr;
}

.history-delta {
    padding: 0.5rem 0.75rem;
    min-width: 62px;
    text-align: center;
    font-weight: 800;
    font-size: var(--text-sm);
}

.history-delta.good {
    background: #eafff5;
}

.history-delta.bad {
    background: #ffe8e8;
}

.pill-btn {
    min-height: 44px;
    border: none;
    padding: 0.8rem 1rem;
    font-weight: 800;
    cursor: pointer;
}

.secondary-btn {
    background: var(--surface-blue);
    color: #29567c;
}

@media (max-width: 760px) {

    .topbar,
    .hero-card,
    .split-grid,
    .levels-grid {
        grid-template-columns: 1fr;
    }

    .topbar {
        align-items: start;
        flex-direction: column;
    }

    .action-grid,
    .levels-grid {
        grid-template-columns: 1fr;
    }

    .orbital-ring {
        width: 180px;
    }
}