:root {
    --nb-bg: #FFFBEB;
    --nb-surface: #FFFFFF;
    --nb-black: #1a1a1a;
    --nb-border: 3px solid var(--nb-black);
    --nb-shadow: 4px 4px 0px var(--nb-black);
    --nb-shadow-sm: 3px 3px 0px var(--nb-black);
    --nb-shadow-lg: 6px 6px 0px var(--nb-black);
    --nb-radius: 4px;
    --nb-radius-lg: 8px;
    --nb-yellow: #FFE600;
    --nb-pink: #FF6B9D;
    --nb-blue: #4ECDC4;
    --nb-coral: #FF6B6B;
    --nb-green: #7BED9F;
    --nb-purple: #A29BFE;
    --nb-orange: #FFA502;
    --nb-font: 'Space Grotesk', sans-serif;
    --nb-mono: 'Space Mono', monospace;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--nb-font);
    background: var(--nb-bg);
    color: var(--nb-black);
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    min-height: 100dvh;
}

.nb-page {
    max-width: 480px;
    margin: 0 auto;
    padding: 1rem;
    min-height: 100vh;
    min-height: 100dvh;
}

.nb-page-wide {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
    min-height: 100vh;
    min-height: 100dvh;
}

.nb-card {
    background: var(--nb-surface);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow);
    padding: 1.5rem;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.nb-card:hover {
    transform: translate(-1px, -1px);
    box-shadow: 5px 5px 0px var(--nb-black);
}

.nb-card-static {
    background: var(--nb-surface);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow);
    padding: 1.5rem;
}

.nb-card-yellow {
    background: var(--nb-yellow);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow);
    padding: 1.5rem;
}

.nb-card-pink {
    background: var(--nb-pink);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow);
    padding: 1.5rem;
}

.nb-card-blue {
    background: var(--nb-blue);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow);
    padding: 1.5rem;
}

.nb-card-green {
    background: var(--nb-green);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow);
    padding: 1.5rem;
}

.nb-card-coral {
    background: var(--nb-coral);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow);
    padding: 1.5rem;
}

.nb-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    font-family: var(--nb-font);
    font-weight: 700;
    font-size: 1rem;
    cursor: pointer;
    text-decoration: none;
    line-height: 1.2;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    transition: transform 0.1s ease, box-shadow 0.1s ease;
    box-shadow: var(--nb-shadow-sm);
}

.nb-btn:active {
    transform: translate(3px, 3px);
    box-shadow: 0px 0px 0px var(--nb-black);
}

.nb-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: var(--nb-shadow-sm);
}

.nb-btn-black {
    background: var(--nb-black);
    color: #fff;
}

.nb-btn-yellow {
    background: var(--nb-yellow);
    color: var(--nb-black);
}

.nb-btn-pink {
    background: var(--nb-pink);
    color: var(--nb-black);
}

.nb-btn-blue {
    background: var(--nb-blue);
    color: var(--nb-black);
}

.nb-btn-green {
    background: var(--nb-green);
    color: var(--nb-black);
}

.nb-btn-coral {
    background: var(--nb-coral);
    color: #fff;
}

.nb-btn-outline {
    background: transparent;
    color: var(--nb-black);
}

.nb-btn-outline:hover {
    background: var(--nb-yellow);
}

.nb-btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
    box-shadow: var(--nb-shadow);
}

.nb-btn-lg:active {
    transform: translate(4px, 4px);
    box-shadow: 0px 0px 0px var(--nb-black);
}

.nb-btn-full {
    width: 100%;
}

.nb-input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    font-family: var(--nb-font);
    font-size: 1rem;
    font-weight: 500;
    color: var(--nb-black);
    background: var(--nb-surface);
    outline: none;
    transition: box-shadow 0.15s ease;
    -webkit-appearance: none;
}

.nb-input:focus {
    box-shadow: var(--nb-shadow-sm);
}

.nb-input::placeholder {
    color: #999;
}

.nb-input-lg {
    padding: 1.125rem 1.25rem;
    font-size: 1.25rem;
    font-family: var(--nb-mono);
}

.nb-label {
    display: block;
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.nb-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.375rem 0.875rem;
    border: 2px solid var(--nb-black);
    border-radius: var(--nb-radius);
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.nb-badge-yellow {
    background: var(--nb-yellow);
    color: var(--nb-black);
}

.nb-badge-pink {
    background: var(--nb-pink);
    color: var(--nb-black);
}

.nb-badge-green {
    background: var(--nb-green);
    color: var(--nb-black);
}

.nb-badge-coral {
    background: var(--nb-coral);
    color: #fff;
}

.nb-badge-blue {
    background: var(--nb-blue);
    color: var(--nb-black);
}

.nb-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-weight: 700;
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--nb-black);
}

.nb-divider::before,
.nb-divider::after {
    content: '';
    flex: 1;
    height: 3px;
    background: var(--nb-black);
}

.nb-stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.nb-stat-card {
    background: var(--nb-surface);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow-sm);
    padding: 1.25rem;
    text-align: center;
}

.nb-stat-value {
    font-family: var(--nb-mono);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1;
}

.nb-stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.375rem;
    opacity: 0.7;
}

.nb-nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    padding: 1rem 1.25rem;
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow-sm);
    font-weight: 700;
    font-size: 1rem;
    text-decoration: none;
    color: var(--nb-black);
    background: var(--nb-surface);
    transition: transform 0.1s ease, box-shadow 0.1s ease;
    -webkit-tap-highlight-color: transparent;
}

.nb-nav-link:active {
    transform: translate(3px, 3px);
    box-shadow: 0px 0px 0px var(--nb-black);
}

.nb-nav-link:hover {
    background: var(--nb-yellow);
}

.nb-nav-icon {
    width: 48px;
    height: 48px;
    border: 2px solid var(--nb-black);
    border-radius: var(--nb-radius);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.nb-nav-arrow {
    margin-left: auto;
    flex-shrink: 0;
}

.nb-bib-display {
    font-family: var(--nb-mono);
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    line-height: 1;
}

.nb-title {
    font-weight: 800;
    font-size: 2rem;
    line-height: 1.1;
}

.nb-title-lg {
    font-weight: 800;
    font-size: 2.5rem;
    line-height: 1.1;
}

.nb-subtitle {
    font-weight: 500;
    font-size: 0.9375rem;
    opacity: 0.7;
}

.nb-alert {
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    padding: 0.875rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
}

.nb-alert-warn {
    background: #FFF3CD;
    border-color: var(--nb-black);
}

.nb-alert-info {
    background: #D1ECF1;
    border-color: var(--nb-black);
}

.nb-alert-error {
    background: var(--nb-coral);
    color: #fff;
    border-color: var(--nb-black);
}

.nb-alert-success {
    background: var(--nb-green);
    border-color: var(--nb-black);
}

.nb-history-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--nb-surface);
    border: 2px solid var(--nb-black);
    border-radius: var(--nb-radius);
    padding: 0.625rem 0.875rem;
}

.nb-empty-state {
    text-align: center;
    padding: 2.5rem 1.5rem;
}

.nb-empty-state svg {
    width: 48px;
    height: 48px;
    margin: 0 auto 0.75rem;
    opacity: 0.4;
}

.nb-back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    font-weight: 700;
    font-size: 0.875rem;
    text-decoration: none;
    color: var(--nb-black);
    border: 2px solid var(--nb-black);
    border-radius: var(--nb-radius);
    padding: 0.5rem 0.875rem;
    background: var(--nb-surface);
    box-shadow: var(--nb-shadow-sm);
    transition: transform 0.1s ease;
}

.nb-back-link:active {
    transform: translate(3px, 3px);
    box-shadow: 0px 0px 0px var(--nb-black);
}

.nb-live-dot {
    width: 10px;
    height: 10px;
    background: var(--nb-green);
    border: 2px solid var(--nb-black);
    border-radius: 50%;
    animation: nb-pulse 1.5s infinite;
}

@keyframes nb-pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.85); }
}

.nb-stripe {
    background: repeating-linear-gradient(
        -45deg,
        var(--nb-yellow),
        var(--nb-yellow) 10px,
        transparent 10px,
        transparent 20px
    );
    height: 8px;
    border: 2px solid var(--nb-black);
}

.nb-mono {
    font-family: var(--nb-mono);
}

/* --- Confirmation / status screens --- */
.nb-confirm-icon {
    width: 76px;
    height: 76px;
    background: var(--nb-surface);
    border: var(--nb-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    box-shadow: var(--nb-shadow-sm);
}

.nb-note {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--nb-black);
    line-height: 1.45;
}

.nb-detail {
    background: var(--nb-surface);
    border: var(--nb-border);
    border-radius: var(--nb-radius);
    box-shadow: var(--nb-shadow-sm);
    padding: 1rem;
    text-align: center;
}

.nb-detail-yellow {
    background: var(--nb-yellow);
}

.nb-detail-label {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--nb-black);
    margin-bottom: 0.375rem;
}

.nb-detail-value {
    font-weight: 700;
    font-size: 1.375rem;
    line-height: 1.2;
    word-break: break-word;
}

.nb-detail-bib {
    font-family: var(--nb-mono);
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.02em;
    word-break: break-word;
}

.nb-note-box {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: var(--nb-surface);
    border: 2px solid var(--nb-black);
    border-radius: var(--nb-radius);
    padding: 0.75rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--nb-black);
    text-align: left;
}

.nb-note-box svg {
    flex-shrink: 0;
}

.nb-hint {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: #4a4a4a;
    margin-top: 0.5rem;
}

.nb-hint svg {
    flex-shrink: 0;
}

@media (min-width: 640px) {
    .nb-page, .nb-page-wide {
        padding: 2rem;
    }
}