:root {
    --bg-start: #eef2ff;
    --bg-end: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --surface: #ffffff;
    --border: #e2e8f0;
    --shadow: 0 10px 30px rgba(15, 23, 42, 0.12);
    --success-bg: #ecfdf3;
    --success-text: #166534;
    --error-bg: #fef2f2;
    --error-text: #b91c1c;
    --accent: #2563eb;
    --accent-hover: #1d4ed8;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "Segoe UI", Arial, sans-serif;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--bg-start), var(--bg-end));
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 24px;
}

.container {
    width: min(100%, 640px);
    text-align: center;
}

h1 {
    margin: 0 0 8px;
    font-size: clamp(1.8rem, 3vw, 2.2rem);
    font-weight: 700;
    letter-spacing: 0.2px;
}

.subtitle {
    margin: 0 0 20px;
    color: var(--text-secondary);
    font-size: 0.98rem;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    padding: 28px;
    border-radius: 16px;
    width: 100%;
    box-shadow: var(--shadow);
    text-align: left;
}

.loading {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0;
}

.status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 18px;
}

.verified {
    background: var(--success-bg);
    color: var(--success-text);
}

.invalid {
    background: var(--error-bg);
    color: var(--error-text);
}

.details {
    display: grid;
    gap: 10px;
    margin-top: 4px;
}

.detail-row {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 12px;
    padding-bottom: 8px;
    border-bottom: 1px dashed var(--border);
}

.detail-label {
    color: var(--text-secondary);
    font-weight: 600;
}

.detail-value {
    color: var(--text-primary);
    font-weight: 600;
    word-break: break-word;
}

.button {
    display: inline-block;
    margin-top: 18px;
    padding: 11px 18px;
    background: var(--accent);
    color: #ffffff;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.button:hover {
    background: var(--accent-hover);
}

.invalid-message {
    margin: 0;
    color: var(--text-secondary);
}

.lookup-form {
    display: grid;
    gap: 10px;
}

.input-label {
    color: var(--text-secondary);
    font-weight: 600;
}

.text-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text-primary);
}

.text-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.helper {
    margin: 8px 0 0;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 640px) {
    .card {
        padding: 22px;
    }

    .detail-row {
        grid-template-columns: 1fr;
        gap: 4px;
    }
}