.nb-onboarding-overlay,
.nb-premium-overlay {
    position: fixed;
    inset: 0;
    z-index: 2147483647;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    overflow: auto;
    background: rgba(3, 10, 24, 0.84);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    opacity: 0;
    visibility: hidden;
    transition: opacity .22s ease, visibility .22s ease;
}

.nb-onboarding-overlay.is-visible,
.nb-premium-overlay.is-visible {
    opacity: 1;
    visibility: visible;
}

.nb-welcome-card,
.nb-tour-card,
.nb-premium-panel {
    width: min(960px, 100%);
    max-height: calc(100vh - 48px);
    overflow: auto;
    color: #dbeafe;
    background: #081426;
    border: 1px solid rgba(96, 165, 250, .2);
    border-radius: 28px;
    box-shadow: 0 36px 100px rgba(0, 0, 0, .55);
    transform: translateY(14px) scale(.985);
    transition: transform .22s ease;
}

.nb-onboarding-overlay.is-visible .nb-welcome-card,
.nb-onboarding-overlay.is-visible .nb-tour-card,
.nb-premium-overlay.is-visible .nb-premium-panel {
    transform: translateY(0) scale(1);
}

.nb-welcome-card {
    display: grid;
    grid-template-columns: 1.08fr .92fr;
    overflow: hidden;
}

.nb-welcome-visual {
    position: relative;
    min-height: 610px;
    padding: 56px;
    overflow: hidden;
    background:
        radial-gradient(circle at 20% 18%, rgba(37, 99, 235, .38), transparent 36%),
        radial-gradient(circle at 84% 84%, rgba(14, 165, 233, .25), transparent 35%),
        linear-gradient(145deg, #0b1d38, #071426 72%);
}

.nb-welcome-visual::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    background-image: linear-gradient(rgba(96, 165, 250, .045) 1px, transparent 1px), linear-gradient(90deg, rgba(96, 165, 250, .045) 1px, transparent 1px);
    background-size: 32px 32px;
}

.nb-brand-mark,
.nb-tour-icon,
.nb-premium-icon {
    width: 58px;
    height: 58px;
    display: grid;
    place-items: center;
    border-radius: 17px;
    color: white;
    background: linear-gradient(135deg, #2563eb, #0ea5e9);
    box-shadow: 0 14px 35px rgba(37, 99, 235, .28);
}

.nb-brand-mark { margin-bottom: 34px; font-size: 1.45rem; }
.nb-welcome-visual > * { position: relative; z-index: 1; }

.nb-kicker {
    display: inline-block;
    margin-bottom: 12px;
    color: #60a5fa;
    font-size: .76rem;
    font-weight: 800;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.nb-welcome-visual h1 {
    max-width: 520px;
    margin: 0 0 20px;
    color: white;
    font-size: clamp(2rem, 4vw, 3.7rem);
    font-weight: 850;
    line-height: 1.04;
    letter-spacing: -.04em;
}

.nb-welcome-visual > p {
    max-width: 500px;
    margin: 0;
    color: #9fb3cd;
    font-size: 1rem;
    line-height: 1.7;
}

.nb-mini-board {
    position: absolute;
    left: 56px;
    right: 56px;
    bottom: 54px;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    padding: 14px;
    border: 1px solid rgba(148, 163, 184, .14);
    border-radius: 18px;
    background: rgba(2, 8, 20, .5);
}

.nb-mini-board > div {
    min-height: 118px;
    padding: 12px;
    border-radius: 12px;
    background: rgba(255, 255, 255, .045);
}

.nb-mini-board span { display: block; margin-bottom: 10px; color: #9fb3cd; font-size: .68rem; font-weight: 700; }
.nb-mini-board b { display: block; height: 26px; margin-bottom: 7px; border-left: 3px solid #38bdf8; border-radius: 7px; background: rgba(96, 165, 250, .12); }
.nb-mini-board > div:nth-child(2) b { border-left-color: #f59e0b; }
.nb-mini-board > div:nth-child(3) b { border-left-color: #34d399; }

.nb-auth-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 12px;
    padding: 48px 42px;
    background: rgba(7, 18, 34, .96);
}

.nb-auth-panel h2 { margin: 0 0 6px; color: white; font-size: 1.55rem; font-weight: 800; }
.nb-muted { margin: 0 0 14px; color: #8094ae; font-size: .86rem; }

.nb-btn {
    min-height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 11px 18px;
    border: 1px solid transparent;
    border-radius: 12px;
    font: inherit;
    font-size: .9rem;
    font-weight: 750;
    cursor: pointer;
    transition: transform .18s ease, background .18s ease, border-color .18s ease, opacity .18s ease;
}

.nb-btn:hover:not(:disabled) { transform: translateY(-1px); }
.nb-btn:disabled { cursor: default; opacity: .48; }
.nb-btn-primary { color: white; background: linear-gradient(135deg, #2563eb, #0ea5e9); box-shadow: 0 10px 24px rgba(37, 99, 235, .2); }
.nb-btn-secondary { color: #c8d7e9; border-color: rgba(148, 163, 184, .17); background: rgba(255, 255, 255, .045); }
.nb-btn-google { color: #1f2937; border-color: #dbe4f0; background: #fff; }
.nb-google-mark { width: 24px; height: 24px; display: grid; place-items: center; color: white; border-radius: 50%; background: #4285f4; font-weight: 900; }

.nb-email-form {
    display: grid;
    gap: 10px;
    margin-top: 4px;
    padding: 16px;
    border: 1px solid rgba(96, 165, 250, .16);
    border-radius: 14px;
    background: rgba(37, 99, 235, .055);
}
.nb-email-form[hidden] { display: none; }
.nb-form-title { color: #dbeafe; font-weight: 750; }
.nb-email-form label { display: grid; gap: 6px; color: #8da3bd; font-size: .76rem; font-weight: 650; }
.nb-email-form input { width: 100%; padding: 11px 12px; color: #e5effb; border: 1px solid rgba(148, 163, 184, .18); border-radius: 10px; outline: none; background: rgba(1, 7, 18, .55); }
.nb-email-form input:focus { border-color: #38bdf8; box-shadow: 0 0 0 3px rgba(56, 189, 248, .1); }
.nb-auth-error { padding: 9px 11px; color: #fecaca; border-radius: 9px; background: rgba(239, 68, 68, .1); font-size: .78rem; }

.nb-skip-link { border: 0; color: #8da3bd; background: transparent; font: inherit; font-size: .83rem; font-weight: 700; cursor: pointer; }
.nb-skip-link:hover { color: #60a5fa; }
.nb-local-note { margin: 2px 0 0; color: #60758f; text-align: center; font-size: .72rem; line-height: 1.5; }

.nb-tour-card { width: min(900px, 100%); }
.nb-tour-header { display: grid; grid-template-columns: 58px 1fr 40px; align-items: center; gap: 18px; padding: 24px 28px; border-bottom: 1px solid rgba(96, 165, 250, .12); }
.nb-tour-icon { width: 50px; height: 50px; font-size: 1.15rem; }
.nb-tour-progress { display: flex; justify-content: center; gap: 8px; }
.nb-tour-progress span { width: 34px; height: 5px; border-radius: 999px; background: rgba(148, 163, 184, .18); }
.nb-tour-progress span.is-active { background: #38bdf8; }
.nb-tour-progress span.is-done { background: #2563eb; }
.nb-icon-button { width: 40px; height: 40px; display: grid; place-items: center; border: 1px solid rgba(148, 163, 184, .15); border-radius: 11px; color: #94a3b8; background: rgba(255, 255, 255, .035); cursor: pointer; }
.nb-tour-content { min-height: 440px; padding: 46px 50px 38px; text-align: center; }
.nb-tour-content h2, .nb-premium-content h2 { margin: 0 0 13px; color: white; font-size: clamp(1.7rem, 3vw, 2.55rem); font-weight: 850; letter-spacing: -.03em; }
.nb-tour-content > p, .nb-premium-content > p { max-width: 650px; margin: 0 auto 34px; color: #91a5be; line-height: 1.7; }
.nb-tour-footer { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 16px; padding: 20px 28px 24px; border-top: 1px solid rgba(96, 165, 250, .12); }
.nb-tour-footer .nb-btn:last-child { justify-self: end; }

.nb-structure { display: grid; grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr; align-items: center; gap: 10px; }
.nb-structure-item { min-height: 150px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 9px; padding: 16px; border: 1px solid rgba(96, 165, 250, .15); border-radius: 16px; background: rgba(37, 99, 235, .06); }
.nb-structure-item i { color: #38bdf8; font-size: 1.35rem; }
.nb-structure-item strong { color: #eaf3ff; }
.nb-structure-item span { color: #768ca6; font-size: .72rem; line-height: 1.45; }
.nb-structure-arrow { color: #31577f; }

.nb-feature-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; text-align: left; }
.nb-feature-tile { display: flex; gap: 14px; align-items: flex-start; padding: 19px; border: 1px solid rgba(96, 165, 250, .14); border-radius: 15px; background: rgba(255, 255, 255, .025); }
.nb-feature-tile > i { width: 38px; height: 38px; display: grid; place-items: center; flex: 0 0 auto; color: #7dd3fc; border-radius: 11px; background: rgba(14, 165, 233, .12); }
.nb-feature-tile strong, .nb-ready-point strong { display: block; margin-bottom: 5px; color: #e7f1ff; font-size: .9rem; }
.nb-feature-tile span, .nb-ready-point span { color: #8095ae; font-size: .77rem; line-height: 1.5; }
.nb-ready-card { max-width: 660px; display: grid; gap: 10px; margin: auto; text-align: left; }
.nb-ready-point { display: flex; align-items: center; gap: 15px; padding: 16px 18px; border: 1px solid rgba(96, 165, 250, .13); border-radius: 14px; background: rgba(37, 99, 235, .045); }
.nb-ready-point > i { width: 36px; color: #60a5fa; text-align: center; font-size: 1.1rem; }

/* Premium journey */
.nb-premium-panel { width: min(820px, 100%); }
.nb-premium-header { display: grid; grid-template-columns: 58px 1fr 42px; align-items: center; gap: 16px; padding: 24px 28px; border-bottom: 1px solid rgba(96, 165, 250, .13); background: linear-gradient(120deg, rgba(37, 99, 235, .12), rgba(14, 165, 233, .04)); }
.nb-premium-icon { font-size: 1.25rem; color: #facc15; }
.nb-premium-price-card .nb-btn-primary .fa-crown { color: #facc15; }
.nb-premium-header-copy strong { display: block; color: #f0f7ff; font-size: 1rem; }
.nb-premium-header-copy span { color: #7690ae; font-size: .75rem; }
.nb-premium-content { min-height: 420px; padding: 42px 46px 34px; text-align: center; }
.nb-premium-progress { display: flex; justify-content: center; gap: 7px; margin-bottom: 25px; }
.nb-premium-progress span { width: 30px; height: 4px; border-radius: 999px; background: rgba(148, 163, 184, .16); }
.nb-premium-progress span.is-active { background: #38bdf8; }
.nb-premium-highlight { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.nb-premium-highlight > div { padding: 20px 15px; border: 1px solid rgba(96, 165, 250, .14); border-radius: 15px; background: rgba(37, 99, 235, .055); }
.nb-premium-highlight i { display: block; margin-bottom: 10px; color: #60a5fa; font-size: 1.2rem; }
.nb-premium-highlight strong { display: block; margin-bottom: 4px; color: #e7f1ff; font-size: .84rem; }
.nb-premium-highlight span { color: #7f94ad; font-size: .72rem; line-height: 1.45; }
.nb-premium-feature-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; text-align: left; }
.nb-premium-feature { display: flex; gap: 13px; padding: 18px; border: 1px solid rgba(96, 165, 250, .14); border-radius: 15px; background: rgba(255, 255, 255, .025); }
.nb-premium-feature i { width: 38px; height: 38px; display: grid; place-items: center; flex: 0 0 auto; color: #bae6fd; border-radius: 11px; background: linear-gradient(135deg, rgba(37, 99, 235, .32), rgba(14, 165, 233, .22)); }
.nb-premium-feature strong { display: block; margin-bottom: 4px; color: #e7f1ff; font-size: .86rem; }
.nb-premium-feature span { color: #7e93ac; font-size: .74rem; line-height: 1.5; }
.nb-premium-price-card { max-width: 560px; margin: auto; padding: 28px; border: 1px solid rgba(56, 189, 248, .3); border-radius: 20px; background: linear-gradient(145deg, rgba(37, 99, 235, .13), rgba(14, 165, 233, .06)); box-shadow: 0 20px 50px rgba(2, 8, 23, .35); }
.nb-premium-price { margin-bottom: 4px; color: white; font-size: 3.2rem; font-weight: 900; letter-spacing: -.05em; }
.nb-premium-price span { color: #8ca1bb; font-size: .9rem; font-weight: 650; letter-spacing: 0; }
.nb-premium-price-card > p { margin: 0 0 19px; color: #8398b1; font-size: .8rem; }
.nb-premium-list { display: grid; grid-template-columns: 1fr 1fr; gap: 9px 14px; padding: 0; margin: 0 0 22px; list-style: none; text-align: left; }
.nb-premium-list li { color: #b7c8db; font-size: .78rem; }
.nb-premium-list i { margin-right: 7px; color: #34d399; }
.nb-premium-price-card .nb-btn { width: 100%; }
.nb-premium-note { margin: 10px 0 0 !important; color: #617892 !important; font-size: .7rem !important; }
.nb-premium-footer { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 18px 28px 22px; border-top: 1px solid rgba(96, 165, 250, .12); }
.nb-premium-footer .nb-btn:last-child { justify-self: end; }

@media (max-width: 760px) {
    .nb-onboarding-overlay, .nb-premium-overlay { align-items: flex-start; padding: 12px; }
    .nb-welcome-card { grid-template-columns: 1fr; }
    .nb-welcome-visual { min-height: 280px; padding: 32px 26px; }
    .nb-welcome-visual h1 { font-size: 2rem; }
    .nb-mini-board { display: none; }
    .nb-auth-panel { padding: 30px 24px; }
    .nb-tour-header, .nb-premium-header { padding: 17px 18px; }
    .nb-tour-content, .nb-premium-content { min-height: 0; padding: 30px 20px; }
    .nb-structure { grid-template-columns: 1fr 1fr; }
    .nb-structure-arrow { display: none; }
    .nb-structure-item { min-height: 115px; }
    .nb-feature-grid, .nb-premium-feature-grid, .nb-premium-list { grid-template-columns: 1fr; }
    .nb-premium-highlight { grid-template-columns: 1fr; }
    .nb-tour-footer, .nb-premium-footer { grid-template-columns: 1fr 1fr; gap: 10px; padding: 16px 18px; }
    .nb-tour-footer .nb-skip-link, .nb-premium-footer .nb-skip-link { grid-column: 1 / -1; grid-row: 2; }
    .nb-tour-footer .nb-btn, .nb-premium-footer .nb-btn { width: 100%; }
}

@media (prefers-reduced-motion: reduce) {
    .nb-onboarding-overlay, .nb-premium-overlay, .nb-welcome-card, .nb-tour-card, .nb-premium-panel, .nb-btn { transition: none; }
}