:root {
    color-scheme: dark;
    --bg: #09090b;
    --panel: #18181b;
    --panel-alt: #27272a;
    --text: #f4f4f5;
    --muted: #a1a1aa;
    --border: #3f3f46;
    --accent: #4f46e5;
    --accent-soft: #312e81;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --text-base: 17px;
    --text-md: 16px;
    --text-sm: 15px;
    --text-xs: 13px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: var(--text-base);
    background: radial-gradient(circle at 20% 0%, #18181b 0%, var(--bg) 55%);
    color: var(--text);
    line-height: 1.5;
}

.container {
    max-width: 1040px;
    margin: 32px auto 60px;
    padding: 0 20px;
}

.hero {
    margin-bottom: 20px;
}

.eyebrow {
    margin: 0 0 8px;
    color: #818cf8;
    font-size: var(--text-xs);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-weight: 700;
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 2.8vw, 2.75rem);
}

.subtitle {
    margin: 8px 0 0;
    color: var(--muted);
}

.card,
.result,
.explanation,
.note {
    background: linear-gradient(180deg, #18181b 0%, #111114 100%);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.card,
.result,
.explanation {
    padding: 20px;
    margin-top: 16px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: #e4e4e7;
    font-size: var(--text-md);
    font-weight: 600;
}

textarea {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid #52525b;
    border-radius: 12px;
    font-family: inherit;
    font-size: var(--text-md);
    background: #0f0f12;
    color: var(--text);
    resize: vertical;
    min-height: 92px;
}

textarea:focus {
    outline: 2px solid #6366f1;
    border-color: #6366f1;
}

.channel-selector {
    margin: 16px 0;
    padding: 12px 14px;
    background: rgba(63, 63, 70, 0.25);
    border: 1px solid var(--border);
    border-radius: 12px;
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    align-items: center;
}

.channel-selector span {
    color: #d4d4d8;
    font-size: var(--text-sm);
}

.channel-selector label {
    margin: 0;
    font-size: var(--text-sm);
    font-weight: 500;
}

button {
    border: none;
    border-radius: 12px;
    padding: 11px 16px;
    font-size: var(--text-md);
    font-weight: 700;
    color: #eef2ff;
    background: linear-gradient(135deg, var(--accent) 0%, #6366f1 100%);
    cursor: pointer;
    transition: transform 0.15s ease, filter 0.15s ease;
}

button:hover:not(:disabled) {
    transform: translateY(-1px);
    filter: brightness(1.07);
}

button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.result h3,
.explanation h2,
.explanation h3 {
    margin-top: 0;
}

.explanation h2 {
    font-size: 1.45rem;
}

.explanation h3 {
    font-size: 1.15rem;
}

.explanation p,
.limitations li {
    font-size: var(--text-sm);
}

.result-content {
    display: grid;
    gap: 10px;
}

.result-row {
    display: grid;
    grid-template-columns: 180px 1fr;
    gap: 12px;
    align-items: start;
    padding-bottom: 8px;
    border-bottom: 1px solid #27272a;
}

.label {
    color: var(--muted);
    font-size: var(--text-sm);
}

.value {
    color: #e4e4e7;
    font-size: var(--text-sm);
}

.email {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.badge,
.badge-small {
    display: inline-flex;
    align-items: center;
    border-radius: 999px;
    font-size: var(--text-xs);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.badge {
    padding: 5px 11px;
}

.badge-small {
    padding: 5px 10px;
}

.badge.complaint,
.badge-small.complaint {
    background: rgba(239, 68, 68, 0.2);
    color: #fca5a5;
}

.badge.sales-inquiry,
.badge-small.sales-inquiry {
    background: rgba(34, 197, 94, 0.2);
    color: #86efac;
}

.badge.shipping-inquiry,
.badge-small.shipping-inquiry {
    background: rgba(245, 158, 11, 0.2);
    color: #fcd34d;
}

.badge.other,
.badge-small.other {
    background: rgba(161, 161, 170, 0.25);
    color: #d4d4d8;
}

.tech-stack,
.categories-grid {
    display: grid;
    gap: 12px;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.tech-item,
.category-card {
    background: rgba(39, 39, 42, 0.6);
    border: 1px solid #3f3f46;
    border-radius: 12px;
    padding: 14px;
}

.tech-item strong,
.category-name {
    color: #c7d2fe;
}

.tech-item span,
.category-desc {
    color: #d4d4d8;
    font-size: var(--text-sm);
}

.tech-note,
.category-email {
    margin-top: 8px;
    font-size: var(--text-xs);
    color: #a1a1aa;
}

.category-name {
    font-size: var(--text-md);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(39, 39, 42, 0.6);
    border: 1px solid #3f3f46;
    border-radius: 12px;
    overflow: hidden;
    margin-top: 10px;
}

th,
td {
    padding: 10px 12px;
    text-align: left;
    font-size: var(--text-sm);
    border-bottom: 1px solid #3f3f46;
}

th {
    background: var(--accent-soft);
    color: #e0e7ff;
}

.architecture-diagram pre {
    margin: 0;
    white-space: pre-wrap;
    background: #0a0a0d;
    border: 1px solid #3f3f46;
    color: #86efac;
    padding: 14px;
    border-radius: 12px;
    font-size: var(--text-xs);
}

.limitations {
    margin-top: 16px;
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.35);
    border-radius: 12px;
    padding: 14px;
}

.limitations ul {
    margin: 10px 0 0 18px;
    color: #f5f5f5;
}

.note {
    margin-top: 16px;
    padding: 14px 16px;
    color: #d4d4d8;
    font-size: var(--text-sm);
}

a {
    color: #a5b4fc;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.hidden {
    display: none;
}

@media (max-width: 700px) {
    .result-row {
        grid-template-columns: 1fr;
    }

    .container {
        padding: 0 14px;
    }
}