/* ═══════════════════════════════════════════════════════════
   REB TOKEN HELPER — app.css
   Mobile-first. Light & Dark themes. WCAG AA compliant.
═══════════════════════════════════════════════════════════ */

/* ───────────────────────────────────────────────
   1. THEME VARIABLES
─────────────────────────────────────────────── */
[data-theme="light"] {
    --c-bg:              #F8FAFC;
    --c-surface:         #FFFFFF;
    --c-surface-2:       #F1F5F9;
    --c-border:          #E2E8F0;
    --c-text-primary:    #0F172A;
    --c-text-secondary:  #475569;
    --c-text-muted:      #94A3B8;
    --c-accent:          #0EA5E9;
    --c-accent-hover:    #0284C7;
    --c-accent-soft:     #E0F2FE;
    --c-accent-glow:     rgba(14, 165, 233, 0.18);
    --c-promo-bg:        #F0FDF4;
    --c-promo-border:    #BBF7D0;
    --c-promo-icon-bg:   #DCFCE7;
    --c-promo-icon:      #16A34A;
    --c-promo-btn:       #16A34A;
    --c-promo-btn-hover: #15803D;
    --c-danger:          #EF4444;
    --c-warning:         #F59E0B;
    --shadow-sm:         0 1px 3px rgba(0,0,0,.07), 0 1px 2px rgba(0,0,0,.05);
    --shadow-md:         0 4px 12px rgba(0,0,0,.09), 0 2px 4px rgba(0,0,0,.06);
}

[data-theme="dark"] {
    --c-bg:              #020817;
    --c-surface:         #0F172A;
    --c-surface-2:       #1E293B;
    --c-border:          #334155;
    --c-text-primary:    #F8FAFC;
    --c-text-secondary:  #94A3B8;
    --c-text-muted:      #64748B;
    --c-accent:          #38BDF8;
    --c-accent-hover:    #7DD3FC;
    --c-accent-soft:     #0C4A6E;
    --c-accent-glow:     rgba(56, 189, 248, 0.18);
    --c-promo-bg:        #052E16;
    --c-promo-border:    #166534;
    --c-promo-icon-bg:   #14532D;
    --c-promo-icon:      #4ADE80;
    --c-promo-btn:       #22C55E;
    --c-promo-btn-hover: #16A34A;
    --c-danger:          #F87171;
    --c-warning:         #FBBF24;
    --shadow-sm:         0 1px 3px rgba(0,0,0,.35), 0 1px 2px rgba(0,0,0,.25);
    --shadow-md:         0 4px 12px rgba(0,0,0,.45), 0 2px 4px rgba(0,0,0,.30);
}

/* ───────────────────────────────────────────────
   2. BASE RESET & BODY
─────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
}

/* Eliminate 300ms tap delay on all interactive elements */
button, a, [role="button"] {
    touch-action: manipulation;
}

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

body {
    background-color: var(--c-bg);
    color: var(--c-text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI',
                 'Helvetica Neue', Arial, sans-serif;
    font-size: 15px;
    line-height: 1.6;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    transition: background-color .25s ease, color .25s ease;
}

/* ───────────────────────────────────────────────
   3. HEADER
─────────────────────────────────────────────── */
.app-header {
    background-color: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: background-color .25s ease, border-color .25s ease;
}

.brand-link {
    color: var(--c-text-primary);
    text-decoration: none;
}

.brand-link:hover {
    color: var(--c-accent);
}

.brand-icon {
    width: 34px;
    height: 34px;
    background: linear-gradient(135deg, #0EA5E9 0%, #0369A1 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 17px;
    flex-shrink: 0;
    box-shadow: 0 2px 6px rgba(14,165,233,.35);
}

.brand-name {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: -.3px;
    color: var(--c-text-primary);
    transition: color .2s;
}

/* Control buttons (theme, lang, nav icons) */
.ctrl-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 8px;
    background-color: var(--c-surface-2);
    border: 1px solid var(--c-border);
    border-radius: 8px;
    color: var(--c-text-secondary);
    font-size: 13px;
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    text-decoration: none;
    transition: background-color .2s, color .2s, border-color .2s;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

.ctrl-btn:hover,
.ctrl-btn:focus-visible {
    background-color: var(--c-accent-soft);
    border-color: var(--c-accent);
    color: var(--c-accent);
    outline: none;
}

.ctrl-btn:focus-visible {
    box-shadow: 0 0 0 3px var(--c-accent-glow);
}

/* ───────────────────────────────────────────────
   4. MAIN LAYOUT
─────────────────────────────────────────────── */
.app-main {
    flex: 1;
}

.container {
    max-width: 600px !important;
}

.app-tagline {
    color: var(--c-text-secondary);
    font-size: 13px;
    margin-bottom: 0;
}

/* ───────────────────────────────────────────────
   5. STAT CARDS
─────────────────────────────────────────────── */
.stat-card {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 12px;
    padding: 12px 6px;
    box-shadow: var(--shadow-sm);
    transition: background-color .25s ease, border-color .25s ease;
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #0EA5E9, #0369A1);
    border-radius: 12px 12px 0 0;
}

.stat-value {
    font-size: 20px;
    font-weight: 800;
    color: var(--c-accent);
    line-height: 1.15;
    min-height: 26px;
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: -.5px;
}

.stat-label {
    font-size: 10px;
    color: var(--c-text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .4px;
    margin-top: 3px;
    line-height: 1.3;
}

/* Skeleton shimmer */
.stat-skeleton {
    display: inline-block;
    width: 44px;
    height: 20px;
    border-radius: 4px;
    background: linear-gradient(
        90deg,
        var(--c-surface-2) 25%,
        var(--c-border)    50%,
        var(--c-surface-2) 75%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    0%   { background-position:  200% 0; }
    100% { background-position: -200% 0; }
}

/* ───────────────────────────────────────────────
   6. PASTE CARD
─────────────────────────────────────────────── */
.paste-card {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 16px;
    padding: 16px;
    box-shadow: var(--shadow-sm);
    transition: background-color .25s ease, border-color .25s ease;
}

.paste-label {
    font-size: 14px;
    font-weight: 700;
    color: var(--c-text-primary);
}

.sms-textarea {
    width: 100%;
    background-color: var(--c-surface-2);
    border: 1.5px solid var(--c-border);
    border-radius: 10px;
    color: var(--c-text-primary);
    font-family: 'Courier New', Courier, monospace;
    font-size: 13px;
    line-height: 1.6;
    padding: 10px 12px;
    resize: vertical;
    min-height: 140px;
    display: block;
    transition: border-color .2s, box-shadow .2s, background-color .25s;
    -webkit-appearance: none;
    appearance: none;
}

.sms-textarea:focus {
    border-color: var(--c-accent);
    box-shadow: 0 0 0 3px var(--c-accent-glow);
    outline: none;
    background-color: var(--c-surface);
}

.sms-textarea::placeholder {
    color: var(--c-text-muted);
}

/* Character counter */
.char-counter {
    font-size: 11px;
    color: var(--c-text-muted);
    white-space: nowrap;
    flex-shrink: 0;
    transition: color .2s;
}

.char-counter.near-limit { color: var(--c-warning); }
.char-counter.at-limit   { color: var(--c-danger);  }

/* Paste footer: counter above, full-width button below */
.paste-footer {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 10px;
}

/* Extract button */
.btn-extract {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: linear-gradient(135deg, #0EA5E9 0%, #0369A1 100%);
    color: #fff;
    border: none;
    border-radius: 12px;
    padding: 13px 20px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: .15px;
    cursor: pointer;
    width: 100%;
    box-shadow: 0 3px 10px rgba(14, 165, 233, .38);
    transition: opacity .2s, transform .15s, box-shadow .2s;
    -webkit-tap-highlight-color: transparent;
    min-height: 50px;
}

.btn-extract:hover:not(:disabled) {
    opacity: .9;
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(14, 165, 233, .45);
}

.btn-extract:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(14, 165, 233, .3);
}

.btn-extract:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--c-accent-glow);
}

.btn-extract:disabled {
    background: var(--c-surface-2);
    color: var(--c-text-muted);
    box-shadow: none;
    cursor: not-allowed;
    opacity: 1;
}

/* ───────────────────────────────────────────────
   7. PROMO CARD
─────────────────────────────────────────────── */
.promo-card {
    background-color: var(--c-promo-bg);
    border: 1px solid var(--c-promo-border);
    border-radius: 16px;
    padding: 16px;
    transition: background-color .25s ease, border-color .25s ease;
}

.promo-icon {
    width: 42px;
    height: 42px;
    background-color: var(--c-promo-icon-bg);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--c-promo-icon);
    font-size: 20px;
    flex-shrink: 0;
}

.promo-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--c-text-primary);
    margin-bottom: 4px;
}

.promo-text {
    font-size: 13px;
    color: var(--c-text-secondary);
    line-height: 1.5;
    margin-bottom: 0;
}

.btn-promo {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background-color: var(--c-promo-btn);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 7px 14px;
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background-color .2s, transform .15s;
    -webkit-tap-highlight-color: transparent;
}

.btn-promo:hover {
    background-color: var(--c-promo-btn-hover);
    color: #fff;
    transform: translateY(-1px);
}

.btn-promo:active {
    transform: translateY(0);
}

/* ───────────────────────────────────────────────
   8. FOOTER
─────────────────────────────────────────────── */
.app-footer {
    background-color: var(--c-surface);
    border-top: 1px solid var(--c-border);
    margin-top: auto;
    transition: background-color .25s ease, border-color .25s ease;
}

.footer-text {
    font-size: 13px;
    color: var(--c-text-secondary);
    margin-bottom: 0;
}

.footer-brand {
    color: var(--c-accent);
    font-weight: 700;
    text-decoration: none;
}

.footer-brand:hover {
    color: var(--c-accent-hover);
    text-decoration: underline;
}

.footer-privacy {
    font-size: 12px;
    color: var(--c-text-muted);
    margin-bottom: 0;
}

/* ───────────────────────────────────────────────
   9. RESPONSIVE — TABLET & UP
─────────────────────────────────────────────── */
@media (min-width: 480px) {
    .stat-value { font-size: 22px; }
    .stat-label { font-size: 10px; }
}

@media (min-width: 576px) {
    .stat-card  { padding: 14px 10px; }
    .stat-value { font-size: 24px; }
    .stat-label { font-size: 11px; }
    .paste-card { padding: 20px; }
    .promo-card { padding: 20px; }
    .app-tagline { font-size: 14px; }
}

@media (min-width: 768px) {
    body { font-size: 16px; }
    .brand-name { font-size: 16px; }
}

/* ───────────────────────────────────────────────
   10. ACCESSIBILITY
─────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: .01ms !important;
        transition-duration: .01ms !important;
    }
}

/* Focus ring for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--c-accent);
    outline-offset: 2px;
}

/* ───────────────────────────────────────────────
   11. TOKEN VIEWER — 3-panel architecture
─────────────────────────────────────────────── */

/* ── Error card ── */
.viewer-error-card {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 20px;
    padding: 40px 20px;
    box-shadow: var(--shadow-md);
    transition: background-color .25s, border-color .25s;
}

.error-emoji {
    font-size: 48px;
    line-height: 1;
    margin-bottom: 16px;
}

.error-heading {
    font-size: 20px;
    font-weight: 800;
    color: var(--c-text-primary);
    margin-bottom: 8px;
    letter-spacing: -.3px;
}

.error-body {
    font-size: 14px;
    color: var(--c-text-secondary);
    line-height: 1.55;
    margin-bottom: 0;
}

/* ── Panel base ── */
.viewer-panel {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 20px;
    padding: 18px 16px;
    box-shadow: var(--shadow-md);
    transition: background-color .25s, border-color .25s;
}

/* ── Top bar ── */
.viewer-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
    min-height: 48px;
    gap: 8px;
}

.viewer-pos {
    font-size: 12px;
    font-weight: 700;
    color: var(--c-text-muted);
    text-transform: uppercase;
    letter-spacing: .6px;
}

.viewer-pos-sub {
    font-size: 12px;
    font-weight: 600;
    color: var(--c-text-muted);
    letter-spacing: .4px;
}

.pos-sep {
    font-size: 12px;
    color: var(--c-text-muted);
    margin: 0 3px;
    flex-shrink: 0;
}

.guided-position {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0 2px;
    min-width: 0;
}

.btn-back-sm {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: none;
    border: none;
    color: var(--c-text-secondary);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 8px;
    transition: background-color .15s, color .15s;
    -webkit-tap-highlight-color: transparent;
    flex-shrink: 0;
    min-height: 44px;
}

.btn-back-sm:hover {
    background-color: var(--c-surface-2);
    color: var(--c-text-primary);
}

/* ── Token hero card ── */
.token-hero-card {
    background-color: var(--c-surface-2);
    border: 1px solid var(--c-border);
    border-radius: 16px;
    padding: 24px 14px 18px;
    text-align: center;
    margin-bottom: 14px;
    transition: background-color .25s, border-color .25s;
}

.token-hero-label {
    font-size: 9px;
    font-weight: 800;
    letter-spacing: 1.8px;
    text-transform: uppercase;
    color: var(--c-text-muted);
    margin-bottom: 10px;
}

.token-hero-text {
    font-family: 'Courier New', Courier, monospace;
    /* Max 30px: at container max-width=600px, 24-char token needs ≤ 31px to fit */
    font-size: clamp(15px, 4.8vw, 30px);
    font-weight: 800;
    color: var(--c-accent);
    letter-spacing: 0.04em;
    line-height: 1.3;
    white-space: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 0 4px 2px;
    margin-bottom: 18px;
}

.token-hero-text::-webkit-scrollbar { display: none; }

/* Copy button */
.btn-copy {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    background-color: var(--c-surface);
    border: 1.5px solid var(--c-border);
    border-radius: 24px;
    padding: 9px 22px;
    font-size: 14px;
    font-weight: 600;
    color: var(--c-text-secondary);
    cursor: pointer;
    transition: all .2s;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
}

.btn-copy:hover {
    background-color: var(--c-accent-soft);
    border-color: var(--c-accent);
    color: var(--c-accent);
}

.btn-copy.copied {
    background-color: #DCFCE7;
    border-color: #16A34A;
    color: #16A34A;
}

[data-theme="dark"] .btn-copy.copied {
    background-color: #052E16;
    border-color: #22C55E;
    color: #22C55E;
}

/* ── Navigation row ── */
.viewer-nav-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 14px;
}

.nav-arrow-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    background-color: var(--c-surface-2);
    border: 1.5px solid var(--c-border);
    border-radius: 12px;
    color: var(--c-text-secondary);
    font-size: 18px;
    cursor: pointer;
    transition: background-color .15s, border-color .15s, color .15s;
    -webkit-tap-highlight-color: transparent;
}

.nav-arrow-btn:hover:not(:disabled) {
    background-color: var(--c-accent-soft);
    border-color: var(--c-accent);
    color: var(--c-accent);
}

.nav-arrow-btn:disabled {
    opacity: .28;
    cursor: not-allowed;
}

.nav-progress-wrap {
    flex: 1;
    text-align: center;
}

.nav-progress-track {
    height: 4px;
    background-color: var(--c-border);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 5px;
}

.nav-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #0EA5E9, #0369A1);
    border-radius: 2px;
    transition: width .35s ease;
}

.nav-progress-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--c-text-muted);
    letter-spacing: .3px;
}

/* ── Mode buttons (Guided | Zoom | Read) ── */
.viewer-mode-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    background-color: var(--c-surface-2);
    border: 1.5px solid var(--c-border);
    border-radius: 12px;
    padding: 12px 6px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .4px;
    color: var(--c-text-secondary);
    cursor: pointer;
    transition: all .2s;
    -webkit-tap-highlight-color: transparent;
    min-height: 62px;
}

.mode-btn i {
    font-size: 20px;
    line-height: 1;
}

.mode-btn:hover {
    background-color: var(--c-accent-soft);
    border-color: var(--c-accent);
    color: var(--c-accent);
}

.mode-btn.active {
    background-color: var(--c-accent);
    border-color: var(--c-accent);
    color: #fff;
}

/* ── Guided panel ── */
.guided-hero {
    text-align: center;
    padding: 4px 0;
    margin-bottom: 4px;
    overflow: hidden;
}

.guided-digit {
    font-family: 'Courier New', Courier, monospace;
    font-size: clamp(76px, 22vw, 128px);
    font-weight: 900;
    color: var(--c-accent);
    letter-spacing: 0.1em;
    line-height: 1;
    user-select: none;
}

/* 5-dot progress */
.guided-dots {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin: 10px 0 18px;
}

.guided-dot {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background-color: var(--c-border);
    transition: background-color .2s, transform .2s;
    flex-shrink: 0;
}

.guided-dot.done   { background-color: var(--c-accent); opacity: .38; }
.guided-dot.active { background-color: var(--c-accent); transform: scale(1.55); }

/* Back | Read | Next */
.guided-ctrl-row {
    display: grid;
    grid-template-columns: 1fr 1.1fr 1fr;
    gap: 8px;
    margin-bottom: 10px;
}

.guided-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    border-radius: 12px;
    padding: 12px 6px;
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    min-height: 50px;
    border: 1.5px solid var(--c-border);
    background-color: var(--c-surface-2);
    color: var(--c-text-secondary);
    transition: all .15s;
    -webkit-tap-highlight-color: transparent;
}

.guided-btn:hover:not(:disabled) {
    background-color: var(--c-accent-soft);
    border-color: var(--c-accent);
    color: var(--c-accent);
}

.guided-btn:disabled {
    opacity: .28;
    cursor: not-allowed;
}

.guided-btn-read {
    background-color: var(--c-accent);
    border-color: var(--c-accent);
    color: #fff;
}

.guided-btn-read:hover:not(:disabled) {
    background-color: var(--c-accent-hover);
    border-color: var(--c-accent-hover);
    color: #fff;
}

.guided-btn-read.reading {
    animation: pulse-read .75s ease-in-out infinite alternate;
}

@keyframes pulse-read {
    from { opacity: .75; }
    to   { opacity: 1;   }
}

/* Token nav (prev/next token inside guided mode) */
.guided-token-nav {
    display: flex;
    gap: 8px;
    margin-bottom: 10px;
}

.guided-token-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
    background: none;
    border: 1.5px solid var(--c-border);
    border-radius: 10px;
    padding: 9px 10px;
    font-size: 13px;
    font-weight: 600;
    color: var(--c-text-secondary);
    cursor: pointer;
    min-height: 48px;
    transition: all .15s;
    -webkit-tap-highlight-color: transparent;
}

.guided-token-btn:hover:not(:disabled) {
    background-color: var(--c-surface-2);
    border-color: var(--c-accent);
    color: var(--c-accent);
}

.guided-token-btn:disabled {
    opacity: .28;
    cursor: not-allowed;
}

/* Speed selector */
.speed-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--c-border);
    margin-top: 2px;
}

.speed-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .5px;
    color: var(--c-text-muted);
    flex-shrink: 0;
}

.speed-btns { display: flex; gap: 4px; }

.speed-btn {
    background: none;
    border: 1.5px solid var(--c-border);
    border-radius: 8px;
    padding: 5px 12px;
    font-size: 12px;
    font-weight: 600;
    color: var(--c-text-secondary);
    cursor: pointer;
    transition: all .15s;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
    min-width: 50px;
}

.speed-btn:hover {
    border-color: var(--c-accent);
    color: var(--c-accent);
    background-color: var(--c-accent-soft);
}

.speed-btn.active {
    background-color: var(--c-accent);
    border-color: var(--c-accent);
    color: #fff;
}

/* ── Zoom panel (dark) ── */
.viewer-panel-dark {
    background-color: #0D1117;
    border-color: #30363D;
}

.viewer-topbar-dark {
    border-bottom: 1px solid rgba(255,255,255,.08);
    padding-bottom: 12px;
    margin-bottom: 6px;
}

.viewer-pos-light {
    font-size: 12px;
    font-weight: 700;
    color: rgba(255,255,255,.55);
    text-transform: uppercase;
    letter-spacing: .6px;
}

.btn-back-light {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.15);
    border-radius: 8px;
    color: rgba(255,255,255,.8);
    font-size: 13px;
    font-weight: 600;
    padding: 7px 12px;
    cursor: pointer;
    transition: background .15s;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
}

.btn-back-light:hover { background: rgba(255,255,255,.14); }

/* Stacked blocks */
.zoom-blocks {
    padding: 10px 0 14px;
}

.zoom-line {
    font-family: 'Courier New', Courier, monospace;
    font-size: clamp(36px, 10vw, 72px);
    font-weight: 900;
    color: #FFFFFF;
    text-align: center;
    letter-spacing: 0.2em;
    line-height: 1.28;
    user-select: none;
}

/* Zoom navigation */
.zoom-nav-row {
    display: flex;
    gap: 10px;
    border-top: 1px solid rgba(255,255,255,.08);
    padding-top: 12px;
    margin-top: 2px;
}

.zoom-nav-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.15);
    border-radius: 12px;
    padding: 13px 14px;
    font-size: 14px;
    font-weight: 700;
    color: rgba(255,255,255,.85);
    cursor: pointer;
    min-height: 50px;
    transition: background .15s;
    -webkit-tap-highlight-color: transparent;
}

.zoom-nav-btn:hover:not(:disabled) { background: rgba(255,255,255,.14); }
.zoom-nav-btn:disabled { opacity: .22; cursor: not-allowed; }

/* ── Viewer responsive ── */
@media (min-width: 480px) {
    .viewer-panel    { padding: 22px 20px; }
    .token-hero-card { padding: 28px 18px 22px; }
    .guided-digit    { font-size: clamp(88px, 20vw, 140px); }
    .zoom-line       { font-size: clamp(40px, 9vw, 80px); }
    .mode-btn        { min-height: 68px; }
}

@media (min-width: 576px) {
    /* Keep token font size at 30px max — do not raise limit here */
    .token-hero-text { font-size: clamp(16px, 3.4vw, 30px); }
    .guided-ctrl-row { gap: 12px; }
}

/* ───────────────────────────────────────────────
   12. VISITOR STATISTICS CARD
─────────────────────────────────────────────── */
.visitor-card {
    background-color: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: 16px;
    padding: 14px 16px;
    box-shadow: var(--shadow-sm);
    transition: background-color .25s ease, border-color .25s ease;
    position: relative;
    overflow: hidden;
}

.visitor-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, #8B5CF6, #6D28D9);
    border-radius: 16px 16px 0 0;
}

.visitor-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .6px;
    color: var(--c-text-muted);
    margin-bottom: 12px;
}

.visitor-title i {
    color: #8B5CF6;
    font-size: 13px;
}

.visitor-stats-row {
    display: flex;
    justify-content: space-around;
    gap: 8px;
}

.visitor-stat-item {
    flex: 1;
    text-align: center;
    min-width: 0;
}

.visitor-stat-icon {
    font-size: 20px;
    line-height: 1;
    margin-bottom: 5px;
}

.visitor-stat-value {
    font-size: 20px;
    font-weight: 800;
    color: #8B5CF6;
    line-height: 1.1;
    letter-spacing: -.5px;
    min-height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.visitor-stat-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .4px;
    color: var(--c-text-muted);
    margin-top: 3px;
    white-space: nowrap;
}

@media (min-width: 480px) {
    .visitor-stat-value { font-size: 22px; }
    .visitor-title { font-size: 12px; }
}

/* ───────────────────────────────────────────────
   13. UI/UX ENHANCEMENTS
─────────────────────────────────────────────── */

/* Improved stat cards — richer visual hierarchy */
.stat-card {
    transition: transform .2s ease, box-shadow .2s ease,
                background-color .25s ease, border-color .25s ease;
}

/* Token hero: better visual emphasis on the actual token value */
.token-hero-card {
    background: linear-gradient(
        160deg,
        var(--c-surface-2) 0%,
        color-mix(in srgb, var(--c-accent-soft) 35%, var(--c-surface-2)) 100%
    );
}

/* Fallback for browsers without color-mix */
@supports not (color: color-mix(in srgb, red 10%, blue)) {
    .token-hero-card {
        background-color: var(--c-surface-2);
    }
}

/* Subtle separator between token hero label and text */
.token-hero-label {
    padding-bottom: 8px;
    border-bottom: 1px dashed var(--c-border);
    margin-bottom: 14px;
}

/* Nav progress fill: smoother transition */
.nav-progress-fill {
    transition: width .4s cubic-bezier(.4, 0, .2, 1);
}

/* Mode buttons: icon grows slightly on hover */
.mode-btn i {
    transition: transform .2s ease;
}
.mode-btn:hover i {
    transform: scale(1.15);
}

/* Guided digit: add subtle text-shadow for outdoor visibility */
.guided-digit {
    text-shadow:
        0 0 40px color-mix(in srgb, var(--c-accent) 30%, transparent),
        0 2px 8px rgba(0,0,0,.12);
}

@supports not (color: color-mix(in srgb, red 10%, blue)) {
    .guided-digit { text-shadow: 0 2px 8px rgba(0,0,0,.12); }
}

/* Zoom line: wider letter-spacing at larger sizes for readability */
@media (min-width: 576px) {
    .zoom-line { letter-spacing: 0.25em; }
}

/* Better focus rings on all interactive elements */
button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--c-accent);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Promo card: subtle hover lift */
.promo-card {
    transition: transform .2s ease, box-shadow .2s ease,
                background-color .25s ease, border-color .25s ease;
}
.promo-card:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Header brand: smooth color on theme switch */
.brand-icon {
    transition: box-shadow .25s ease;
}

/* Improved paste card focus state */
.paste-card:focus-within {
    border-color: transparent;
    box-shadow: var(--shadow-md), 0 0 0 3px var(--c-accent-glow);
}