/* ============================================================
   bable.pro — styles.css
   Theme: The Probable · midnight-blue · retro-futuristic
   Fonts: Futura (Jost fallback), Inter, Lora
   ============================================================ */

@layer reset, tokens, base, layout, components, utilities;

/* ---------- RESET ---------- */
@layer reset {
    *, *::before, *::after { box-sizing: border-box; }
    html, body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; padding: 0; }
    ul, ol { list-style: none; }
    img, svg { display: block; max-width: 100%; }
    a { color: inherit; text-decoration: none; }
    button { font: inherit; background: none; border: 0; color: inherit; cursor: pointer; }
    summary { cursor: pointer; }
    summary::-webkit-details-marker { display: none; }
}

/* ---------- DESIGN TOKENS ---------- */
@layer tokens {
    :root {
        /* Palette — Midnight Blue */
        --c-abyss: #05091A;
        --c-midnight: #0C1433;
        --c-surface: #162050;
        --c-luminous: #8FD8FF;
        --c-phosphor: #B8FFEA;
        --c-embers: #FFB27A;
        --c-foam: #EAF2FF;
        --c-tide: #9FB0D6;

        /* Type — Futura PT with Jost fallback (Google Font) */
        --ff-display: "Futura PT", "Futura", "Jost", "Century Gothic", system-ui, sans-serif;
        --ff-body: "Futura PT", "Futura", "Jost", "Inter", system-ui, sans-serif;
        --ff-serif: "Lora", Georgia, serif;

        --fs-eyebrow: 0.78rem;
        --fs-base: 1rem;
        --fs-md: 1.25rem;
        --fs-lg: 1.56rem;
        --fs-xl: 1.95rem;
        --fs-2xl: 2.44rem;
        --fs-3xl: 3.05rem;

        /* Spacing */
        --s-1: 4px;
        --s-2: 8px;
        --s-3: 12px;
        --s-4: 16px;
        --s-5: 24px;
        --s-6: 32px;
        --s-7: 48px;
        --s-8: 64px;
        --s-9: 96px;

        /* Radii */
        --r-1: 4px;
        --r-2: 8px;
        --r-3: 16px;
        --r-pill: 999px;

        /* Motion */
        --ease-rise: cubic-bezier(0.2, 0.8, 0.2, 1);
        --dur-quick: 180ms;
        --dur-calm: 400ms;
        --dur-drift: 26s;

        /* Layout */
        --container: 1200px;
        --gutter: clamp(20px, 4vw, 48px);
    }
}

/* ---------- BASE ---------- */
@layer base {
    html { scroll-behavior: smooth; }
    body {
        font-family: var(--ff-body);
        font-weight: 400;
        font-size: var(--fs-base);
        line-height: 1.6;
        color: var(--c-foam);
        background: radial-gradient(ellipse at 50% -20%, #131c4a 0%, var(--c-abyss) 40%, var(--c-abyss) 100%);
        min-height: 100vh;
        overflow-x: hidden;
        letter-spacing: -0.005em;
    }

    h1, h2, h3, h4 {
        font-family: var(--ff-display);
        font-weight: 600;
        letter-spacing: 0.005em;
        line-height: 1.15;
        color: var(--c-foam);
    }

    h1 { font-size: clamp(var(--fs-2xl), 6vw, var(--fs-3xl)); letter-spacing: 0.02em; }
    h2 { font-size: clamp(var(--fs-xl), 4vw, var(--fs-2xl)); letter-spacing: 0.02em; }
    h3 { font-size: var(--fs-md); letter-spacing: 0.01em; }
    h4 { font-size: var(--fs-base); letter-spacing: 0.04em; text-transform: uppercase; color: var(--c-tide); }

    p { color: var(--c-foam); }
    em { font-family: var(--ff-serif); font-style: italic; color: var(--c-phosphor); font-weight: 500; }

    ::selection { background: var(--c-luminous); color: var(--c-abyss); }
}

/* ---------- LAYOUT ---------- */
@layer layout {
    .container {
        width: 100%;
        max-width: var(--container);
        margin: 0 auto;
        padding-left: var(--gutter);
        padding-right: var(--gutter);
    }

    .skip-link {
        position: absolute;
        top: -100px;
        left: 0;
        padding: var(--s-3) var(--s-4);
        background: var(--c-phosphor);
        color: var(--c-abyss);
        z-index: 1000;
        transition: top var(--dur-quick);
    }
    .skip-link:focus { top: 0; }

    /* HEADER */
    .site-header {
        position: sticky;
        top: 0;
        z-index: 50;
        backdrop-filter: blur(14px) saturate(140%);
        -webkit-backdrop-filter: blur(14px) saturate(140%);
        background: rgba(5, 9, 26, 0.55);
        border-bottom: 1px solid rgba(143, 216, 255, 0.08);
    }

    .header__inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: var(--s-5);
        padding-top: var(--s-4);
        padding-bottom: var(--s-4);
    }

    .brand {
        display: inline-flex;
        align-items: center;
        gap: var(--s-3);
        font-family: var(--ff-display);
        font-weight: 600;
        font-size: 1.05rem;
        letter-spacing: 0.06em;
        color: var(--c-foam);
        transition: transform var(--dur-quick) var(--ease-rise);
    }
    .brand:hover { transform: scale(1.04); }
    .brand__mark { transition: filter var(--dur-quick); }
    .brand:hover .brand__mark { filter: drop-shadow(0 0 6px var(--c-luminous)); }
    .brand__dot { color: var(--c-embers); }

    .primary-nav__list {
        display: flex;
        gap: var(--s-6);
        font-size: 0.95rem;
        letter-spacing: 0.04em;
    }
    .primary-nav a {
        position: relative;
        padding: var(--s-2) 0;
        color: var(--c-foam);
        transition: color var(--dur-quick);
    }
    .primary-nav a::after {
        content: "";
        position: absolute;
        left: 0; bottom: 0;
        width: 100%;
        height: 1px;
        background: var(--c-luminous);
        transform: scaleX(0);
        transform-origin: left;
        transition: transform var(--dur-quick) var(--ease-rise);
    }
    .primary-nav a:hover { color: var(--c-luminous); }
    .primary-nav a:hover::after { transform: scaleX(1); }

    .header__cta {
        display: flex;
        gap: var(--s-3);
        align-items: center;
    }

    .nav-toggle {
        display: none;
        flex-direction: column;
        gap: 5px;
        padding: var(--s-2);
        border-radius: var(--r-2);
        transition: transform var(--dur-quick) var(--ease-rise);
    }
    .nav-toggle span {
        display: block;
        width: 24px;
        height: 1.5px;
        background: var(--c-foam);
        transition: transform var(--dur-quick), opacity var(--dur-quick);
    }
    .nav-toggle:hover { transform: scale(1.05); }
    .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
    .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

    .mobile-nav {
        display: none;
        padding: var(--s-5) var(--gutter) var(--s-7);
        background: var(--c-midnight);
        border-top: 1px solid rgba(143, 216, 255, 0.08);
    }
    .mobile-nav__list {
        display: flex;
        flex-direction: column;
        gap: var(--s-4);
        font-family: var(--ff-display);
        font-size: var(--fs-md);
        letter-spacing: 0.03em;
    }
    .mobile-nav a { color: var(--c-foam); }

    /* AMBIENT BUBBLE FIELD (page background) */
    .ambient-field {
        position: fixed;
        inset: 0;
        pointer-events: none;
        z-index: 0;
        overflow: hidden;
    }
    .ambient-bubble {
        position: absolute;
        border-radius: 50%;
        border: 1px solid rgba(143, 216, 255, 0.18);
        background: radial-gradient(circle at 35% 35%, rgba(184, 255, 234, 0.10), rgba(143, 216, 255, 0.04) 50%, transparent 70%);
        will-change: transform, opacity;
    }
    .ambient-bubble--a { width: 320px; height: 320px; left: -80px; top: 80vh; animation: drift 34s var(--ease-rise) infinite; }
    .ambient-bubble--b { width: 180px; height: 180px; left: 70%; top: 120vh; animation: drift 26s var(--ease-rise) infinite -8s; }
    .ambient-bubble--c { width: 90px; height: 90px; left: 30%; top: 200vh; animation: drift 18s var(--ease-rise) infinite -3s; }
    .ambient-bubble--d { width: 240px; height: 240px; left: 80%; top: 280vh; animation: drift 30s var(--ease-rise) infinite -12s; }
    .ambient-bubble--e { width: 60px; height: 60px; left: 12%; top: 340vh; animation: drift 22s var(--ease-rise) infinite -2s; }
    .ambient-bubble--f { width: 140px; height: 140px; left: 55%; top: 420vh; animation: drift 28s var(--ease-rise) infinite -10s; }
    .ambient-bubble--g { width: 200px; height: 200px; left: -40px; top: 480vh; animation: drift 32s var(--ease-rise) infinite -6s; }
    .ambient-bubble--h { width: 70px; height: 70px; left: 88%; top: 540vh; animation: drift 20s var(--ease-rise) infinite -14s; }
    .ambient-bubble--i { width: 110px; height: 110px; left: 35%; top: 600vh; animation: drift 24s var(--ease-rise) infinite -4s; }

    @keyframes drift {
        0%   { transform: translate3d(0, 0, 0) scale(1); opacity: 0.35; }
        50%  { transform: translate3d(20px, -60px, 0) scale(1.08); opacity: 0.55; }
        100% { transform: translate3d(0, -120px, 0) scale(1); opacity: 0; }
    }

    /* HERO */
    .hero {
        position: relative;
        min-height: 80vh;
        padding: clamp(60px, 12vh, 140px) 0 clamp(80px, 14vh, 160px);
        overflow: hidden;
    }
    @media (max-width: 768px) {
        .hero { min-height: 100svh; padding: 60px 0 80px; }
    }

    .hero__inner {
        position: relative;
        z-index: 2;
    }

    .hero__title {
        font-size: clamp(2.4rem, 7vw, 4.6rem);
        line-height: 1.05;
        max-width: 16ch;
        margin-bottom: var(--s-5);
        letter-spacing: 0.005em;
    }

    .hero__lede {
        font-size: clamp(1.05rem, 1.6vw, 1.25rem);
        max-width: 56ch;
        color: var(--c-foam);
        margin-bottom: var(--s-7);
    }

    .hero__cta-row {
        display: flex;
        flex-wrap: wrap;
        gap: var(--s-4);
        margin-bottom: var(--s-8);
    }

    .hero__stage {
        position: absolute;
        right: -10%;
        top: 0;
        width: 70%;
        height: 100%;
        z-index: 1;
        opacity: 0.85;
        pointer-events: none;
    }
    .hero-bubbles { width: 100%; height: 100%; }
    .hero-bubble {
        transform: translate(calc(var(--x, 0) * 1px), calc(var(--y, 0) * 1px));
        transition: transform 600ms var(--ease-rise);
        will-change: transform;
    }
    .hero-bubble[data-depth] { animation: float-bubble var(--dur-drift) var(--ease-rise) infinite; }
    .hero-bubble:nth-child(2) { animation-duration: 22s; animation-delay: -3s; }
    .hero-bubble:nth-child(3) { animation-duration: 30s; animation-delay: -7s; }
    .hero-bubble:nth-child(4) { animation-duration: 18s; animation-delay: -2s; }
    .hero-bubble:nth-child(5) { animation-duration: 24s; animation-delay: -5s; }

    @keyframes float-bubble {
        0%, 100% { translate: 0 0; }
        50% { translate: 0 -14px; }
    }

    @media (max-width: 900px) {
        .hero__stage { opacity: 0.45; right: -30%; width: 110%; }
    }

    .hero__tide {
        position: absolute;
        left: 0; right: 0; bottom: 0;
        height: 120px;
        background: linear-gradient(180deg, transparent 0%, rgba(12, 20, 51, 0.9) 80%, var(--c-midnight) 100%);
        z-index: 1;
    }

    /* BANDS */
    .band {
        position: relative;
        padding: clamp(80px, 12vh, 140px) 0;
        z-index: 2;
    }
    .band--depth { background: var(--c-abyss); }
    .band--mid { background: var(--c-midnight); }
    .band--shallow { background: linear-gradient(180deg, var(--c-midnight) 0%, #182663 100%); }
    .band--surface {
        background: linear-gradient(180deg, #182663 0%, #2a3b87 60%, #4d6bc4 100%);
        color: var(--c-abyss);
    }

    .band--depth + .band--mid,
    .band--mid + .band--depth {
        position: relative;
    }

    .band__grid {
        display: grid;
        grid-template-columns: 220px 1fr;
        gap: var(--s-8);
        align-items: start;
    }
    @media (max-width: 900px) {
        .band__grid { grid-template-columns: 1fr; gap: var(--s-6); }
    }

    /* SPINE TOC */
    .spine {
        position: sticky;
        top: 100px;
        border-left: 1px solid rgba(143, 216, 255, 0.18);
        padding-left: var(--s-5);
    }
    .spine__label {
        font-size: var(--fs-eyebrow);
        text-transform: uppercase;
        letter-spacing: 0.14em;
        color: var(--c-tide);
        margin-bottom: var(--s-4);
    }
    .spine__list {
        display: flex;
        flex-direction: column;
        gap: var(--s-3);
        counter-reset: spineNum;
    }
    .spine__list li { counter-increment: spineNum; }
    .spine__link {
        display: inline-block;
        padding: 4px 0;
        color: var(--c-tide);
        font-size: 0.95rem;
        letter-spacing: 0.04em;
        transition: color var(--dur-quick), transform var(--dur-quick) var(--ease-rise);
    }
    .spine__link::before {
        content: counter(spineNum, decimal-leading-zero) " · ";
        color: var(--c-luminous);
        opacity: 0.6;
    }
    .spine__link:hover, .spine__link.is-active {
        color: var(--c-foam);
        transform: translateX(4px);
    }
    .spine__link.is-active { color: var(--c-phosphor); }
    @media (max-width: 900px) {
        .spine { display: none; }
    }
}

/* ---------- COMPONENTS ---------- */
@layer components {
    /* Eyebrow */
    .eyebrow {
        display: inline-block;
        font-size: var(--fs-eyebrow);
        text-transform: uppercase;
        letter-spacing: 0.14em;
        color: var(--c-luminous);
        margin-bottom: var(--s-4);
        font-weight: 500;
    }

    .section-title {
        font-family: var(--ff-display);
        font-size: clamp(1.8rem, 4vw, 2.8rem);
        max-width: 22ch;
        margin-bottom: var(--s-5);
    }
    .section-title--light { color: var(--c-abyss); }

    .lede {
        font-size: clamp(1.05rem, 1.5vw, 1.2rem);
        max-width: 60ch;
        color: var(--c-foam);
        margin-bottom: var(--s-7);
    }
    .lede--wide { max-width: 70ch; }
    .lede--light { color: var(--c-midnight); }

    /* Buttons */
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: var(--s-2);
        padding: 12px 22px;
        min-height: 44px;
        border-radius: var(--r-pill);
        font-family: var(--ff-display);
        font-size: 0.95rem;
        letter-spacing: 0.06em;
        font-weight: 500;
        line-height: 1;
        cursor: pointer;
        position: relative;
        transition: transform var(--dur-quick) var(--ease-rise),
                    filter var(--dur-quick),
                    background-color var(--dur-quick),
                    color var(--dur-quick),
                    box-shadow var(--dur-quick);
        white-space: nowrap;
    }
    .btn--lg { padding: 16px 28px; min-height: 52px; font-size: 1rem; }
    .btn--full { width: 100%; }

    .btn--ember {
        background: var(--c-embers);
        color: var(--c-abyss);
        box-shadow: 0 0 0 0 rgba(255, 178, 122, 0);
    }
    .btn--ember:hover {
        transform: scale(1.04);
        filter: brightness(1.08);
        box-shadow: 0 8px 32px -8px rgba(255, 178, 122, 0.5);
    }
    .btn--ember:active { transform: scale(0.98); }

    .btn--ghost {
        background: transparent;
        color: var(--c-foam);
        border: 1px solid rgba(143, 216, 255, 0.4);
    }
    .btn--ghost:hover {
        transform: scale(1.04);
        color: var(--c-luminous);
        border-color: var(--c-luminous);
        box-shadow: 0 0 0 1px rgba(143, 216, 255, 0.4) inset;
    }
    .btn--ghost:active { transform: scale(0.98); }

    .band--surface .btn--ghost {
        color: var(--c-abyss);
        border-color: rgba(5, 9, 26, 0.4);
    }
    .band--surface .btn--ghost:hover {
        color: var(--c-midnight);
        border-color: var(--c-midnight);
    }

    /* Feature cards (product band) */
    .feature-row {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--s-5);
        margin-top: var(--s-6);
    }
    @media (max-width: 800px) { .feature-row { grid-template-columns: 1fr; } }

    .feature-card {
        padding: var(--s-6);
        background: var(--c-surface);
        border-radius: var(--r-3);
        border: 1px solid rgba(143, 216, 255, 0.10);
        transition: transform var(--dur-quick) var(--ease-rise),
                    border-color var(--dur-quick),
                    box-shadow var(--dur-quick);
    }
    .feature-card:hover {
        transform: scale(1.03);
        border-color: rgba(184, 255, 234, 0.5);
        box-shadow: 0 12px 40px -12px rgba(143, 216, 255, 0.25);
    }
    .feature-card__icon {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 52px;
        height: 52px;
        border-radius: 50%;
        background: rgba(143, 216, 255, 0.10);
        color: var(--c-luminous);
        margin-bottom: var(--s-4);
        transition: background var(--dur-quick), color var(--dur-quick), transform var(--dur-quick) var(--ease-rise);
    }
    .feature-card:hover .feature-card__icon {
        background: rgba(184, 255, 234, 0.18);
        color: var(--c-phosphor);
        transform: scale(1.06);
    }
    .feature-card h3 { margin-bottom: var(--s-3); color: var(--c-foam); }
    .feature-card p { color: var(--c-tide); font-size: 0.98rem; line-height: 1.55; }

    /* Features tile grid */
    .grid--features {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: var(--s-4);
        margin-top: var(--s-6);
    }
    @media (max-width: 1024px) { .grid--features { grid-template-columns: repeat(2, 1fr); } }
    @media (max-width: 560px) { .grid--features { grid-template-columns: 1fr; } }

    .tile {
        position: relative;
        padding: var(--s-6) var(--s-5);
        background: rgba(22, 32, 80, 0.55);
        border-radius: var(--r-3);
        border: 1px solid rgba(143, 216, 255, 0.08);
        overflow: hidden;
        transition: transform var(--dur-quick) var(--ease-rise),
                    border-color var(--dur-quick),
                    background var(--dur-quick);
    }
    .tile::before {
        content: "";
        position: absolute;
        inset: -2px;
        border-radius: inherit;
        background: radial-gradient(circle at top right, rgba(184, 255, 234, 0.20), transparent 50%);
        opacity: 0;
        transition: opacity var(--dur-quick);
        pointer-events: none;
    }
    .tile:hover {
        transform: scale(1.04);
        border-color: rgba(184, 255, 234, 0.4);
    }
    .tile:hover::before { opacity: 1; }
    .tile__num {
        font-family: var(--ff-serif);
        font-style: italic;
        font-size: 1.1rem;
        color: var(--c-embers);
        letter-spacing: 0.04em;
        display: block;
        margin-bottom: var(--s-3);
    }
    .tile h3 { font-size: 1.1rem; margin-bottom: var(--s-3); color: var(--c-foam); }
    .tile p { color: var(--c-tide); font-size: 0.92rem; line-height: 1.55; }

    /* Pricing */
    .pricing {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--s-5);
        margin-top: var(--s-6);
    }
    @media (max-width: 900px) { .pricing { grid-template-columns: 1fr; } }

    .plan {
        display: flex;
        flex-direction: column;
        gap: var(--s-5);
        padding: var(--s-7) var(--s-6);
        background: var(--c-surface);
        border-radius: var(--r-3);
        border: 1px solid rgba(143, 216, 255, 0.10);
        transition: transform var(--dur-quick) var(--ease-rise),
                    border-color var(--dur-quick),
                    box-shadow var(--dur-quick);
    }
    .plan:hover {
        transform: scale(1.03);
        border-color: rgba(184, 255, 234, 0.4);
        box-shadow: 0 16px 48px -16px rgba(143, 216, 255, 0.3);
    }
    .plan--featured {
        border-color: rgba(255, 178, 122, 0.45);
        box-shadow: 0 0 0 1px rgba(255, 178, 122, 0.25), 0 12px 40px -16px rgba(255, 178, 122, 0.3);
        background: linear-gradient(180deg, var(--c-surface) 0%, #1d2a66 100%);
    }
    .plan__head { display: flex; flex-direction: column; gap: var(--s-2); position: relative; }
    .plan__badge {
        position: absolute;
        top: -42px;
        left: 0;
        font-size: var(--fs-eyebrow);
        text-transform: uppercase;
        letter-spacing: 0.14em;
        color: var(--c-embers);
        font-weight: 500;
    }
    .plan h3 {
        font-size: 1.4rem;
        font-family: var(--ff-display);
        letter-spacing: 0.04em;
        text-transform: uppercase;
    }
    .plan__price { font-family: var(--ff-display); font-size: 1rem; color: var(--c-tide); }
    .plan__price span {
        font-size: 2.4rem;
        color: var(--c-foam);
        font-weight: 600;
        letter-spacing: 0.01em;
        font-variant-numeric: tabular-nums;
    }
    .plan__price em {
        font-family: var(--ff-body);
        font-style: normal;
        font-size: 0.95rem;
        color: var(--c-tide);
    }
    .plan__list {
        display: flex;
        flex-direction: column;
        gap: var(--s-3);
        flex: 1;
        margin-bottom: var(--s-2);
    }
    .plan__list li {
        position: relative;
        padding-left: 22px;
        color: var(--c-foam);
        font-size: 0.95rem;
        line-height: 1.5;
    }
    .plan__list li::before {
        content: "";
        position: absolute;
        left: 0;
        top: 8px;
        width: 8px;
        height: 8px;
        border-radius: 50%;
        background: var(--c-luminous);
        box-shadow: 0 0 8px rgba(143, 216, 255, 0.6);
    }
    .plan--featured .plan__list li::before { background: var(--c-phosphor); }

    /* Quotes */
    .quotes {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--s-5);
        margin-top: var(--s-6);
        margin-bottom: var(--s-8);
    }
    @media (max-width: 900px) { .quotes { grid-template-columns: 1fr; } }

    .quote {
        padding: var(--s-6);
        background: rgba(22, 32, 80, 0.45);
        border-radius: var(--r-3);
        border: 1px solid rgba(143, 216, 255, 0.10);
        position: relative;
        transition: transform var(--dur-quick) var(--ease-rise), border-color var(--dur-quick);
    }
    .quote:hover {
        transform: scale(1.03);
        border-color: rgba(184, 255, 234, 0.4);
    }
    .quote::before {
        content: "\201C";
        position: absolute;
        top: 8px;
        left: 18px;
        font-family: var(--ff-serif);
        font-size: 4rem;
        line-height: 1;
        color: var(--c-luminous);
        opacity: 0.35;
    }
    .quote blockquote {
        font-family: var(--ff-serif);
        font-style: italic;
        font-size: 1.05rem;
        line-height: 1.55;
        color: var(--c-foam);
        margin-bottom: var(--s-4);
        position: relative;
        z-index: 1;
    }
    .quote figcaption { display: flex; flex-direction: column; gap: 2px; }
    .quote__name { color: var(--c-phosphor); font-weight: 500; letter-spacing: 0.04em; }
    .quote__role { font-size: 0.85rem; color: var(--c-tide); letter-spacing: 0.02em; }

    .logos {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--s-7);
        padding-top: var(--s-7);
        border-top: 1px solid rgba(143, 216, 255, 0.12);
    }
    .logos li {
        font-family: var(--ff-display);
        font-size: 1rem;
        letter-spacing: 0.14em;
        text-transform: uppercase;
        color: var(--c-tide);
        opacity: 0.7;
        transition: opacity var(--dur-quick), color var(--dur-quick), transform var(--dur-quick) var(--ease-rise);
    }
    .logos li:hover {
        opacity: 1;
        color: var(--c-foam);
        transform: scale(1.04);
    }

    /* FAQ */
    .faq {
        display: flex;
        flex-direction: column;
        gap: var(--s-3);
        max-width: 820px;
        margin-top: var(--s-6);
    }
    .faq__item {
        background: rgba(22, 32, 80, 0.45);
        border-radius: var(--r-3);
        border: 1px solid rgba(143, 216, 255, 0.10);
        padding: var(--s-4) var(--s-5);
        transition: border-color var(--dur-quick), transform var(--dur-quick) var(--ease-rise);
    }
    .faq__item:hover { border-color: rgba(184, 255, 234, 0.35); }
    .faq__item[open] {
        border-color: rgba(143, 216, 255, 0.4);
        background: rgba(22, 32, 80, 0.7);
    }
    .faq__item summary {
        display: flex;
        justify-content: space-between;
        align-items: center;
        gap: var(--s-4);
        font-family: var(--ff-display);
        font-size: 1.1rem;
        font-weight: 500;
        letter-spacing: 0.02em;
        color: var(--c-foam);
        padding: var(--s-2) 0;
        list-style: none;
        position: relative;
    }
    .faq__item summary::after {
        content: "";
        width: 14px;
        height: 14px;
        border-right: 1.5px solid var(--c-luminous);
        border-bottom: 1.5px solid var(--c-luminous);
        transform: rotate(45deg);
        margin-right: 6px;
        transition: transform var(--dur-quick) var(--ease-rise);
        flex-shrink: 0;
    }
    .faq__item[open] summary::after {
        transform: rotate(-135deg);
        margin-right: 0;
    }
    .faq__item p {
        margin-top: var(--s-3);
        color: var(--c-tide);
        line-height: 1.65;
    }

    /* About */
    .about { text-align: left; max-width: 820px; }
    .about__cta {
        display: flex;
        flex-wrap: wrap;
        gap: var(--s-4);
        margin-top: var(--s-6);
    }

    /* FOOTER */
    .site-footer {
        position: relative;
        background: var(--c-abyss);
        padding: var(--s-9) 0 var(--s-5);
        border-top: 1px solid rgba(143, 216, 255, 0.10);
        color: var(--c-tide);
        z-index: 2;
    }
    .site-footer__grid {
        display: grid;
        grid-template-columns: 1fr 2fr 1fr;
        gap: var(--s-7);
        align-items: start;
    }
    @media (max-width: 900px) {
        .site-footer__grid { grid-template-columns: 1fr; }
    }
    .site-footer__brand { display: flex; flex-direction: column; gap: var(--s-4); }
    .brand--footer { font-size: 1rem; }
    .site-footer__tag {
        font-family: var(--ff-serif);
        font-style: italic;
        color: var(--c-tide);
        font-size: 0.95rem;
    }
    .site-footer__nav {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: var(--s-6);
    }
    @media (max-width: 560px) {
        .site-footer__nav { grid-template-columns: repeat(2, 1fr); }
    }
    .site-footer__nav h4 {
        font-size: var(--fs-eyebrow);
        text-transform: uppercase;
        letter-spacing: 0.14em;
        color: var(--c-luminous);
        margin-bottom: var(--s-4);
    }
    .site-footer__nav ul { display: flex; flex-direction: column; gap: var(--s-2); }
    .site-footer__nav a {
        color: var(--c-foam);
        font-size: 0.95rem;
        transition: color var(--dur-quick), transform var(--dur-quick) var(--ease-rise);
        display: inline-block;
    }
    .site-footer__nav a:hover {
        color: var(--c-luminous);
        transform: translateX(3px);
    }
    .site-footer__bubble {
        justify-self: end;
        animation: float-bubble 14s var(--ease-rise) infinite;
        opacity: 0.7;
    }
    @media (max-width: 900px) {
        .site-footer__bubble { justify-self: start; }
    }
    .site-footer__copy {
        margin-top: var(--s-7);
        padding-top: var(--s-5);
        border-top: 1px solid rgba(143, 216, 255, 0.08);
        font-size: 0.85rem;
        letter-spacing: 0.04em;
        color: var(--c-tide);
        text-align: center;
    }
}

/* ---------- UTILITIES ---------- */
@layer utilities {
    /* Reveal-on-scroll */
    .reveal {
        opacity: 0;
        transform: translateY(24px);
        transition: opacity var(--dur-calm) var(--ease-rise), transform var(--dur-calm) var(--ease-rise);
    }
    .reveal.is-visible {
        opacity: 1;
        transform: translateY(0);
    }

    /* Mobile nav toggle visibility */
    @media (max-width: 900px) {
        .primary-nav, .header__cta { display: none; }
        .nav-toggle { display: flex; }
        .mobile-nav.is-open { display: block; }
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    .reveal { opacity: 1; transform: none; }
    .ambient-bubble { animation: none; opacity: 0.3; }
}