:root {
    --snake-space-1: 4px;
    --snake-space-2: 8px;
    --snake-space-3: 12px;
    --snake-space-4: 16px;
    --snake-space-5: 20px;
    --snake-space-6: 24px;
    --snake-space-8: 32px;
    --snake-space-12: 48px;
    --snake-space-16: 64px;
    --snake-radius-sm: 10px;
    --snake-radius-md: 14px;
    --snake-radius-lg: 18px;
    --snake-radius-xl: 24px;
    --snake-gold: var(--accent-gold, var(--gold, #d4af37));
    --snake-gold-light: var(--accent-gold-light, var(--gold-light, #f3d76d));
    --snake-green: var(--accent-green, var(--green-2, #22c55e));
    --snake-text: var(--text-primary, var(--text, #fff));
    --snake-muted: var(--text-muted, var(--faint, #89938b));
    --snake-line: var(--border-color, var(--line, rgba(255,255,255,.09)));
    --snake-motion-fast: 140ms;
    --snake-motion-base: 220ms;
    --snake-motion-reveal: 420ms;
    --snake-ease: cubic-bezier(.2,.7,.2,1);
    --snake-layer-nav: 1500;
    --snake-layer-overlay: 2100;
    --snake-bg: #050505;
    --snake-panel: rgba(15, 18, 15, .96);
    --snake-shadow: 0 24px 70px rgba(0, 0, 0, .42);
}

:where(a, button, input, select, textarea, summary):focus-visible {
    outline: 2px solid var(--snake-gold-light);
    outline-offset: 3px;
}

.snake-bottomnav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--snake-layer-nav);
    display: none;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    align-items: stretch;
    background: rgba(8,9,8,.94);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(212,175,55,.18);
    padding-bottom: env(safe-area-inset-bottom);
    transition: transform var(--snake-motion-base) var(--snake-ease);
}

.snake-bottomnav.sbn-hidden,
body.menu-open .snake-bottomnav,
body.cta-sticky-active .snake-bottomnav {
    transform: translateY(120%);
    pointer-events: none;
}

.sbn-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--snake-space-1);
    min-height: 54px;
    padding: 8px 4px 7px;
    color: #8a938c;
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: .2px;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    transition: color var(--snake-motion-base) ease, transform var(--snake-motion-fast) ease;
}

.sbn-item svg {
    width: 22px;
    height: 22px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.sbn-item.active,
.sbn-item[aria-current="page"],
.sbn-item[aria-current="location"] {
    color: var(--snake-gold-light);
}

.sbn-item:active { transform: scale(.94); }

/* Shared compact header actions and fullscreen mobile surfaces. */
.snake-shell-actions {
    display: inline-flex;
    align-items: center;
    gap: var(--snake-space-2);
}

.snake-desktop-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.snake-desktop-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 8px 12px;
    border-radius: 10px;
    color: var(--snake-muted);
    font-size: 13px;
    font-weight: 700;
    text-decoration: none;
    transition: color var(--snake-motion-base) ease, background var(--snake-motion-base) ease;
}

.snake-desktop-links a:hover,
.snake-desktop-links a[aria-current="page"] {
    color: #fff;
    background: rgba(255,255,255,.055);
}

.snake-desktop-links .snake-elite-link {
    margin-left: 4px;
    border: 1px solid rgba(212,175,55,.35);
    color: var(--snake-gold-light);
}

.snake-icon-button {
    display: inline-grid;
    place-items: center;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid rgba(255,255,255,.11);
    border-radius: var(--snake-radius-md);
    background: rgba(255,255,255,.035);
    color: var(--snake-text);
    cursor: pointer;
    transition: transform var(--snake-motion-fast) var(--snake-ease), border-color var(--snake-motion-base) ease, color var(--snake-motion-base) ease;
}

.snake-icon-button:hover { border-color: rgba(212,175,55,.42); color: var(--snake-gold-light); }
.snake-icon-button:active { transform: scale(.96); }
.snake-icon-button svg { width: 21px; height: 21px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.snake-menu-trigger { display: none; }

.snake-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--snake-layer-overlay);
    display: flex;
    flex-direction: column;
    padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
    background: rgba(5,6,5,.985);
    backdrop-filter: blur(18px);
    color: var(--snake-text);
}

.snake-overlay[hidden] { display: none; }
.snake-overlay-head {
    display: flex;
    align-items: center;
    gap: var(--snake-space-3);
    width: min(760px, 100%);
    margin: 0 auto;
    padding: 16px 20px;
    border-bottom: 1px solid rgba(212,175,55,.16);
}
.snake-search-field {
    flex: 1;
    min-width: 0;
    min-height: 48px;
    border: 0;
    outline: 0;
    background: transparent;
    color: #fff;
    font: 600 18px/1.3 'DM Sans', sans-serif;
}
.snake-search-field::placeholder { color: #737d75; }
.snake-overlay-body {
    width: min(760px, 100%);
    margin: 0 auto;
    padding: 12px 20px 42px;
    overflow-y: auto;
}
.snake-search-group { margin: 20px 2px 7px; color: var(--snake-muted); font: 700 10px/1.2 'JetBrains Mono', monospace; letter-spacing: 1.4px; text-transform: uppercase; }
.snake-search-result { display: flex; flex-direction: column; gap: 3px; min-height: 56px; padding: 10px 13px; border-radius: var(--snake-radius-md); }
.snake-search-result:hover,.snake-search-result:focus-visible { background: rgba(212,175,55,.08); }
.snake-search-result strong { color: #fff; font-size: 15px; }
.snake-search-result span { color: #89938b; font-size: 12.5px; }
.snake-search-empty { padding: 42px 12px; color: #89938b; text-align: center; }

.snake-menu-panel { display: flex; flex: 1; flex-direction: column; width: min(680px, 100%); margin: 0 auto; padding: 22px 20px 28px; overflow-y: auto; }
.snake-menu-brand { display: flex; align-items: center; justify-content: space-between; margin-bottom: 24px; }
.snake-menu-brand img { width: 126px; height: auto; }
.snake-menu-links { display: grid; gap: 4px; }
.snake-menu-links a { display: flex; align-items: center; justify-content: space-between; min-height: 54px; padding: 9px 4px; border-bottom: 1px solid rgba(255,255,255,.065); color: #fff; font: 800 clamp(22px,6vw,32px)/1.1 'Syne', sans-serif; }
.snake-menu-links a::after { content: '\2192'; color: var(--snake-gold); font: 500 20px/1 'DM Sans', sans-serif; }
.snake-menu-links a[aria-current] { color: var(--snake-gold-light); }
.snake-menu-foot { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: auto; padding-top: 28px; }
.snake-menu-foot a { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 10px 14px; border: 1px solid rgba(212,175,55,.25); border-radius: var(--snake-radius-md); color: var(--snake-gold-light); font-weight: 700; text-align: center; }
body.snake-overlay-open { overflow: hidden; }

.reading-status {
    position: fixed;
    right: 14px;
    top: 74px;
    z-index: 18;
    padding: 6px 10px;
    border: 1px solid var(--snake-line);
    border-radius: 999px;
    background: rgba(8,10,8,.88);
    backdrop-filter: blur(10px);
    color: var(--snake-gold-light);
    font: 700 10.5px/1.2 'JetBrains Mono', monospace;
    pointer-events: none;
}
.reading-status.is-done { border-color: rgba(34,197,94,.42); color: var(--snake-green); }
.article-save { display: inline-flex; align-items: center; min-height: 36px; padding: 6px 11px; border: 1px solid var(--snake-line); border-radius: 999px; background: rgba(255,255,255,.025); color: var(--snake-muted); font: 700 11px/1.2 'JetBrains Mono', monospace; cursor: pointer; }
.article-save[aria-pressed="true"] { border-color: rgba(212,175,55,.44); background: rgba(212,175,55,.09); color: var(--snake-gold-light); }

.field-error {
    display: none;
    margin-top: 7px;
    color: #ff9b9b;
    font-size: 12px;
    line-height: 1.4;
}

.field-error.is-visible { display: block; }

:where(input, select)[aria-invalid="true"] {
    border-color: rgba(255,107,107,.78) !important;
    box-shadow: 0 0 0 3px rgba(255,107,107,.10);
}

.program-features-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 7px;
    width: 100%;
    min-height: 44px;
    margin: -2px 0 14px;
    border: 0;
    background: transparent;
    color: var(--snake-gold-light);
    font: 700 12px/1.2 'DM Sans', sans-serif;
    cursor: pointer;
}

.program-features-toggle::after {
    content: '↓';
    transition: transform var(--snake-motion-base) ease;
}

.program-features-toggle[aria-expanded="true"]::after { transform: rotate(180deg); }

@media (max-width: 940px) {
    .snake-desktop-links { display: none; }
    .snake-menu-trigger { display: inline-grid; }
}

@media (max-width: 700px) {
    .snake-bottomnav { display: grid; }
    body.has-snake-bottomnav { padding-bottom: calc(58px + env(safe-area-inset-bottom)); }
    .program-features.is-collapsible:not(.is-expanded) > li:nth-child(n+5) { display: none; }
    .program-features-toggle { display: inline-flex; }
    .snake-menu-trigger { display: inline-grid; }
    .snake-desktop-links { display: none; }
    .nav .nav-inner { min-height: 62px; padding-top: 9px; padding-bottom: 9px; }
    .nav .brand img { max-height: 32px; }
    .nav .nav-actions > a { display: none !important; }
    .snake-menu-foot { grid-template-columns: 1fr; }
    .reading-status { top: auto; right: 12px; bottom: calc(66px + env(safe-area-inset-bottom)); }
}

@media (prefers-reduced-motion: reduce) {
    .snake-bottomnav,
    .sbn-item,
    .program-features-toggle::after,
    .snake-icon-button { transition: none; }
    .sbn-item:active,.snake-icon-button:active { transform: none; }
}