:root {
    --bg: #f6f6ef;
    --card: #fffdf7;
    --text: #19212e;
    --primary: #0f766e;
    --primary-dark: #115e59;
    --danger: #b91c1c;
    --border: #ded8c7;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: "Sarabun", "Noto Sans Thai", "Segoe UI", Tahoma, sans-serif;
    line-height: 1.5;
    color: var(--text);
    background: radial-gradient(circle at top right, #fff1c7 0, #f6f6ef 40%), linear-gradient(160deg, #f6f6ef, #ecf7f5);
    min-height: 100vh;
}

.container {
    width: min(980px, 92vw);
    margin: 36px auto;
}

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 20px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
}

h1, h2, h3 {
    margin-top: 0;
}

form {
    display: grid;
    gap: 12px;
}

label {
    display: grid;
    gap: 6px;
    font-weight: 600;
}

input, textarea, select, button {
    font: inherit;
}

input, textarea, select {
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid #b9c0c8;
    background: #ffffff;
}

button, .btn {
    border: 0;
    border-radius: 10px;
    padding: 10px 14px;
    background: var(--primary);
    color: #fff;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

button:hover, .btn:hover {
    background: var(--primary-dark);
}

.btn-danger {
    background: var(--danger);
}

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    align-items: center;
    margin-bottom: 20px;
}

.flash {
    margin-bottom: 14px;
    padding: 10px 12px;
    border-radius: 10px;
}

.flash.info {
    background: #dbf4ff;
    border: 1px solid #8ecdf0;
}

.flash.success {
    background: #ddfce3;
    border: 1px solid #8dd7a0;
}

.flash.error {
    background: #ffe3e3;
    border: 1px solid #f1a2a2;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
}

table th,
table td {
    border: 1px solid var(--border);
    padding: 9px;
    text-align: left;
}

.grid {
    display: grid;
    gap: 14px;
}

.grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.muted {
    color: #5d6671;
}

.help {
    margin-top: 8px;
    font-size: 0.94rem;
}

.title-tight {
    margin-bottom: 4px;
}

@media (max-width: 860px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }

    .container {
        margin: 18px auto;
    }

    .card {
        padding: 16px;
    }
}