:root {
    --bg-from: #1e1b4b;
    --bg-to: #312e81;
    --card: #ffffff;
    --text: #111827;
    --muted: #6b7280;
    --border: #e5e7eb;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --accent-soft: #e0e7ff;
    --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    --danger: #dc2626;
    --warn-bg: #fffbeb;
    --warn-border: #f59e0b;
    --warn-text: #78350f;
    --success: #059669;
    --shadow: 0 32px 64px rgba(0, 0, 0, 0.18), 0 8px 24px rgba(0, 0, 0, 0.10);
    --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.08);
    --radius: 20px;
    --radius-sm: 12px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background: linear-gradient(135deg, var(--bg-from) 0%, var(--bg-to) 100%);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

.page {
    max-width: 640px;
    margin: 0 auto;
    padding: 3rem 1.25rem 4rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.page--stats { max-width: 960px; }

/* Brand header above the card */
.brand {
    text-align: center;
    color: rgba(255,255,255,0.85);
    margin-bottom: .25rem;
}
.brand__icon {
    width: 52px;
    height: 52px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: .75rem;
    backdrop-filter: blur(8px);
}
.brand__title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 .3rem;
    letter-spacing: -0.02em;
}
.brand__sub {
    font-size: .9rem;
    opacity: .7;
    margin: 0;
}

/* Feature badges */
.badges {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: .5rem;
    margin-top: .75rem;
}
.badge {
    display: inline-flex;
    align-items: center;
    gap: .3rem;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.15);
    color: rgba(255,255,255,0.85);
    border-radius: 999px;
    padding: .25rem .75rem;
    font-size: .78rem;
    font-weight: 500;
    backdrop-filter: blur(4px);
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 2.25rem 2rem;
    border: 1px solid rgba(255,255,255,0.6);
}

.card__header { margin-bottom: 1.5rem; }
.card__header h1,
.card__header h2 {
    margin: 0 0 .4rem 0;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
    color: var(--text);
}
.card__header h2 { font-size: 1.2rem; }

.lead {
    margin: 0;
    color: var(--muted);
    font-size: .92rem;
}

.form { display: flex; flex-direction: column; gap: .85rem; }
.form__label {
    font-weight: 600;
    font-size: .88rem;
    color: var(--text);
    letter-spacing: 0.01em;
}

.input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}
.input-wrap__icon {
    position: absolute;
    left: .9rem;
    color: var(--muted);
    pointer-events: none;
    display: flex;
}
.input-wrap .form__input {
    padding-left: 2.6rem;
}

.form__input {
    width: 100%;
    padding: .8rem 1rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    background: #fafafa;
    color: var(--text);
    transition: border-color .15s, box-shadow .15s, background .15s;
}
.form__input:focus-visible {
    outline: none;
    border-color: var(--accent);
    background: #fff;
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.form__input::placeholder { color: #b0b7c3; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
    padding: .8rem 1.4rem;
    border-radius: var(--radius-sm);
    border: 1.5px solid transparent;
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: opacity .15s, transform .1s, box-shadow .15s;
    user-select: none;
    letter-spacing: 0.01em;
}
.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.btn--primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 4px 16px rgba(79, 70, 229, 0.35);
}
.btn--primary:hover {
    opacity: .92;
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
}
.btn--primary:active { transform: translateY(1px); box-shadow: none; }
.btn--secondary {
    background: #f9fafb;
    color: var(--text);
    border-color: var(--border);
}
.btn--secondary:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.btn--sm { padding: .45rem .85rem; font-size: .85rem; }

.btn[disabled], .btn[aria-busy="true"] { opacity: .6; cursor: not-allowed; }

.btn__spinner {
    display: none;
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255,255,255,.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .7s linear infinite;
}
.btn[aria-busy="true"] .btn__spinner { display: inline-block; }

@keyframes spin { to { transform: rotate(360deg); } }

.messages { min-height: 0; }
.messages .msg {
    padding: .7rem 1rem;
    border-radius: var(--radius-sm);
    font-size: .92rem;
    margin-top: .75rem;
    display: flex;
    align-items: center;
    gap: .5rem;
}
.msg--error   { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.msg--success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }

/* Result section */
.result {
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    animation: fadeUp .35s ease both;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.result__header {
    display: flex;
    align-items: center;
    gap: .6rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border);
}
.result__header-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 0 3px rgba(5,150,105,.15);
    flex-shrink: 0;
}
.result__title {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
}

.result__qr {
    display: flex;
    justify-content: center;
}
.result__qr-inner {
    background: linear-gradient(135deg, #f8f9ff, #f0f0ff);
    border: 1.5px solid #e0e7ff;
    border-radius: 20px;
    padding: 1.25rem;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: .75rem;
    box-shadow: 0 4px 16px rgba(79,70,229,.08);
}
.result__image img {
    display: block;
    border-radius: 12px;
    background: #fff;
    padding: .5rem;
    border: 1px solid #dde1f5;
    max-width: 100%;
    height: auto;
}
.result__qr-label {
    font-size: .75rem;
    color: var(--accent);
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.result__fields {
    display: flex;
    flex-direction: column;
    gap: .85rem;
}
.result__field { display: flex; flex-direction: column; gap: .3rem; }
.result__label {
    font-size: .8rem;
    color: var(--muted);
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}
.result__value input {
    width: 100%;
    padding: .6rem .85rem;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: .9rem;
    background: #f9fafb;
    color: var(--text);
    font-family: 'SF Mono', 'Fira Code', monospace;
}
.result__value--row {
    display: flex;
    align-items: stretch;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    overflow: hidden;
    background: #f9fafb;
    transition: border-color .15s, box-shadow .15s;
}
.result__value--row:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}
.result__value--row input {
    flex: 1;
    min-width: 0;
    padding: .6rem .85rem;
    border: none;
    border-radius: 0;
    font-size: .85rem;
    background: transparent;
    color: var(--text);
    font-family: 'SF Mono', 'Fira Code', monospace;
    outline: none;
}
.result__value--row .btn--copy {
    flex-shrink: 0;
    padding: .5rem .9rem;
    border-radius: 0;
    border: none;
    border-left: 1.5px solid var(--border);
    background: #f3f4f6;
    color: var(--muted);
    font-size: .8rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s, color .15s;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: .3rem;
}
.result__value--row .btn--copy:hover {
    background: var(--accent-soft);
    color: var(--accent);
}
.result__value--row .btn--copy.copied {
    background: #f0fdf4;
    color: var(--success);
}
.result__value input:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.result__actions {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
}

.divider {
    height: 1px;
    background: var(--border);
    margin: .25rem 0;
}

.notice {
    padding: .7rem 1rem;
    border-radius: var(--radius-sm);
    font-size: .88rem;
    display: flex;
    align-items: flex-start;
    gap: .5rem;
}
.notice--warning {
    background: var(--warn-bg);
    color: var(--warn-text);
    border: 1px solid var(--warn-border);
}
.notice__icon { flex-shrink: 0; margin-top: 1px; }

/* Stats page */
.metrics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.metric {
    padding: 1rem 1.1rem;
    background: #f9fafb;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    gap: .2rem;
}
.metric__label { font-size: .78rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.metric__value { font-size: 1.6rem; font-weight: 700; letter-spacing: -0.02em; color: var(--text); }

.info-grid { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1.5rem; }
.info { display: flex; flex-direction: column; gap: .35rem; }
.info__label { font-size: .78rem; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.info__value { word-break: break-all; }
.info__value--link { color: var(--accent); text-decoration: none; }
.info__value--link:hover { text-decoration: underline; }
.info__row { display: flex; gap: .5rem; align-items: stretch; }
.info__input {
    flex: 1;
    padding: .55rem .75rem;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: .9rem;
    background: #f9fafb;
}
.info__input:focus-visible {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.qr-block {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: #f9fafb;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
}
.qr-block__image {
    background: #fff;
    padding: .5rem;
    border-radius: 10px;
    border: 1px solid var(--border);
}

.chart {
    display: flex;
    gap: 4px;
    align-items: flex-end;
    height: 200px;
    padding: 1rem 0;
    overflow-x: auto;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1.5rem;
}
.chart__col {
    flex: 1 0 32px;
    min-width: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: .35rem;
    height: 100%;
    justify-content: flex-end;
}
.chart__bar {
    width: 100%;
    background: var(--accent-gradient);
    border-radius: 6px 6px 0 0;
    position: relative;
    min-height: 4px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    color: #fff;
    font-size: .75rem;
    padding-top: 2px;
    transition: opacity .15s;
}
.chart__bar:hover { opacity: .85; }
.chart__bar--spacer {
    flex: 1;
}
.chart__value { font-weight: 600; }
.chart__label { font-size: .7rem; color: var(--muted); }

.table-wrap { overflow-x: auto; }
.table {
    width: 100%;
    border-collapse: collapse;
    font-size: .92rem;
}
.table th, .table td {
    padding: .55rem .75rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
.table th {
    font-weight: 600;
    color: var(--muted);
    font-size: .78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.empty {
    color: var(--muted);
    text-align: center;
    padding: 2rem 0;
}

.footer {
    text-align: center;
    color: rgba(255,255,255,0.45);
    font-size: .82rem;
}
.footer p { margin: 0 0 .25rem; }
.footer__author { color: rgba(255,255,255,0.6); font-weight: 500; }
.footer__link { color: rgba(255,255,255,0.7); text-decoration: none; }
.footer__link:hover { color: #fff; text-decoration: underline; }

@media (max-width: 560px) {
    .page { padding: 1.5rem .85rem 3rem; }
    .card { padding: 1.5rem 1.25rem; }
    .card__header h1 { font-size: 1.2rem; }
    .metric__value { font-size: 1.25rem; }
    .info__row { flex-direction: column; }
    .brand__title { font-size: 1.25rem; }
}