:root {
    --bg: #f5f1e8;
    --ink: #24312f;
    --muted: #70807b;
    --card: #fffdf7;
    --line: #ded7c8;
    --brand: #176b5d;
    --brand-dark: #0f4a40;
    --accent: #d9963b;
    --danger: #b42318;
    --warning: #a15c07;
    --radius: 18px;
    --shadow: 0 20px 60px rgba(36, 49, 47, .12);
    font-family: "Tahoma", "Noto Sans Thai", sans-serif;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    color: var(--ink);
    background:
        radial-gradient(circle at top left, rgba(217, 150, 59, .24), transparent 30rem),
        linear-gradient(135deg, #f7f0df 0%, #edf3ee 48%, #f8f5ec 100%);
    min-height: 100vh;
}
a { color: var(--brand); text-decoration: none; }
label { display: block; margin: 12px 0 6px; font-weight: 700; }
input, select, textarea {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 11px 12px;
    background: #fff;
    color: var(--ink);
}
textarea { min-height: 110px; resize: vertical; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--muted); font-size: 13px; }

.app-navbar {
    height: 64px;
    display: flex;
    align-items: center;
    gap: 18px;
    padding: 0 24px;
    background: rgba(255, 253, 247, .9);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(14px);
    position: sticky;
    top: 0;
    z-index: 5;
}
.navbar-user { margin-left: auto; display: flex; gap: 14px; align-items: center; }
.app-shell { display: flex; min-height: calc(100vh - 64px); }
.app-sidebar {
    width: 250px;
    padding: 22px;
    background: rgba(22, 57, 51, .94);
    color: #fff;
}
.sidebar-title { font-size: 22px; font-weight: 900; letter-spacing: 3px; margin-bottom: 20px; }
.app-sidebar a {
    display: block;
    color: #f8f5ec;
    padding: 12px 14px;
    border-radius: 14px;
    margin-bottom: 6px;
}
.app-sidebar a:hover { background: rgba(255, 255, 255, .12); }
.app-content { flex: 1; padding: 30px; max-width: 1360px; margin: 0 auto; width: 100%; }
.app-footer { padding: 14px 24px; color: var(--muted); text-align: center; }
.sidebar-toggle { display: none; }

.page-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; }
.page-head h1, .card h1, .card h2 { margin: 0 0 6px; }
.muted { color: var(--muted); }
.card, .login-card, .stat-card {
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}
.card { padding: 22px; margin-bottom: 20px; }
.stat-grid, .feature-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
    margin-bottom: 20px;
}
.feature-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.feature-grid > div {
    background: #f5efe2;
    border-radius: 14px;
    padding: 14px;
}
.stat-card { padding: 18px; }
.stat-card span { color: var(--muted); display: block; }
.stat-card strong { font-size: 34px; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: 10px 14px;
    background: #fff;
    color: var(--ink);
    cursor: pointer;
    font-weight: 700;
}
.btn.primary { background: var(--brand); color: #fff; border-color: var(--brand); }
.btn.danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn.warning { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.full { width: 100%; margin-top: 16px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.table-wrap { overflow-x: auto; }
.badge { display: inline-block; padding: 5px 9px; border-radius: 999px; background: #e7efe9; color: var(--brand-dark); font-size: 12px; font-weight: 700; }
.badge.locked { background: #f9e6df; color: var(--danger); }
.alert { border-radius: 14px; padding: 12px 14px; margin: 12px 0; }
.alert.danger { background: #fee4e2; color: var(--danger); }
.alert.warning { background: #fef0c7; color: var(--warning); }
.alert.success { background: #dcfae6; color: #067647; }
.login-body { display: grid; place-items: center; padding: 24px; }
.login-card { width: min(440px, 100%); padding: 28px; }
.brand-mark {
    width: 64px;
    height: 64px;
    border-radius: 20px;
    background: var(--brand);
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 16px;
}
.signature-box {
    min-height: 130px;
    border: 1px dashed var(--line);
    border-radius: 14px;
    padding: 12px;
    background: #fff;
}
.signature-img { max-height: 110px; max-width: 240px; display: block; }

@media (max-width: 900px) {
    .app-shell { display: block; }
    .app-sidebar { display: none; width: 100%; }
    .app-sidebar.open { display: block; }
    .sidebar-toggle { display: inline-flex; }
    .page-head, .grid-2, .grid-3 { display: block; }
    .stat-grid, .feature-grid { grid-template-columns: 1fr; }
    .navbar-user span { display: none; }
    .app-content { padding: 18px; }
}