:root {
    --bg: #0f172a;
    --surface: #1e293b;
    --surface2: #334155;
    --text: #f8fafc;
    --muted: #94a3b8;
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --ok: #10b981;
    --warn: #f59e0b;
    --err: #ef4444;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: 'Sarabun', sans-serif;
    background: linear-gradient(160deg, #0f172a 0%, #1e1b4b 100%);
    color: var(--text);
}

.wrap {
    max-width: 720px;
    margin: 0 auto;
    padding: 1.25rem;
}

header {
    text-align: center;
    margin-bottom: 1.5rem;
}

header h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
}

header p {
    margin: 0.35rem 0 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--surface2);
    border-radius: 1rem;
    padding: 1.25rem;
    margin-bottom: 1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,.25);
}

.card h2 {
    margin: 0 0 0.75rem;
    font-size: 1.1rem;
}

.muted { color: var(--muted); font-size: 0.875rem; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    border: none;
    border-radius: 0.65rem;
    padding: 0.65rem 1rem;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background .15s, transform .1s;
}

.btn:active { transform: scale(.98); }

.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--surface2); color: var(--text); }
.btn-block { width: 100%; }

label {
    display: block;
    font-size: 0.8rem;
    color: var(--muted);
    margin-bottom: 0.35rem;
}

input[type="text"],
input[type="password"],
input[type="file"],
select {
    width: 100%;
    padding: 0.7rem 0.85rem;
    border-radius: 0.65rem;
    border: 1px solid var(--surface2);
    background: #0b1220;
    color: var(--text);
    font: inherit;
    margin-bottom: 0.85rem;
}

input:focus, select:focus {
    outline: 2px solid var(--accent);
    outline-offset: 1px;
}

.scan-input {
    font-size: 1.75rem;
    letter-spacing: 0.15em;
    text-align: center;
    font-weight: 700;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

@media (max-width: 520px) {
    .grid-2 { grid-template-columns: 1fr; }
}

.stat-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.stat {
    flex: 1;
    min-width: 120px;
    background: #0b1220;
    border-radius: 0.75rem;
    padding: 0.75rem;
    text-align: center;
}

.stat .num {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
}

.stat .lbl { font-size: 0.75rem; color: var(--muted); }

.toast {
    position: fixed;
    left: 50%;
    bottom: 1.25rem;
    transform: translateX(-50%);
    max-width: min(92vw, 480px);
    padding: 0.85rem 1rem;
    border-radius: 0.75rem;
    font-weight: 600;
    z-index: 100;
    animation: slideUp .25s ease;
}

.toast.ok { background: #064e3b; border: 1px solid var(--ok); }
.toast.err { background: #7f1d1d; border: 1px solid var(--err); }
.toast.warn { background: #78350f; border: 1px solid var(--warn); }

@keyframes slideUp {
    from { opacity: 0; transform: translate(-50%, 12px); }
    to { opacity: 1; transform: translate(-50%, 0); }
}

.hidden { display: none !important; }

.result-box {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 0.75rem;
    background: #0b1220;
    border-left: 4px solid var(--accent);
}

.result-box.ok { border-color: var(--ok); }
.result-box.err { border-color: var(--err); }
.result-box.warn { border-color: var(--warn); }

.nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    background: var(--surface2);
    color: var(--muted);
}