:root {
    --brand-dark: #12312B;
    --brand-primary: #1F6F5C;
    --brand-accent: #F2A541;
    --bg: #FFFFFF;
    --text: #17181A;
    --border: #D8DEDC;
    --danger: #B3261E;
    --success: #1F6F5C;
    --warning: #8A5B00;
    --info: #1F5A8A;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 18px;
    line-height: 1.5;
    color: var(--text);
    background: #F7F8F7;
}

.app-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--brand-dark);
    padding: 16px 28px;
    flex-wrap: wrap;
}

.app-nav .brand {
    color: #fff;
    font-size: 22px;
    font-weight: 700;
    text-decoration: none;
}

.nav-links a {
    color: #E8EFEC;
    text-decoration: none;
    margin-left: 20px;
    font-size: 17px;
    font-weight: 600;
}

.nav-links a:hover { color: var(--brand-accent); }

.business-bar {
    background: #E8EFEC;
    border-bottom: 2px solid var(--border);
    padding: 10px 28px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 15px;
}
.business-bar strong { color: var(--brand-dark); }

.app-main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 32px 24px 80px;
}

.flash-container { margin-bottom: 20px; }

.flash {
    padding: 14px 18px;
    border-radius: 8px;
    font-weight: 600;
    margin-bottom: 10px;
    border: 2px solid transparent;
}
.flash-success { background: #E4F3EE; color: var(--success); border-color: var(--success); }
.flash-danger { background: #FBE9E7; color: var(--danger); border-color: var(--danger); }
.flash-warning { background: #FBF1DD; color: var(--warning); border-color: var(--warning); }
.flash-info { background: #E6F0F8; color: var(--info); border-color: var(--info); }

h1 { font-size: 32px; font-weight: 800; margin: 0 0 8px; }
h2 { font-size: 24px; font-weight: 700; margin: 32px 0 12px; }
h3 { font-size: 20px; font-weight: 700; margin: 0 0 8px; }

a { color: var(--brand-primary); }

.card {
    background: #fff;
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 20px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 16px;
}

.stat-card {
    background: #fff;
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
}
.stat-card .stat-number { font-size: 36px; font-weight: 800; color: var(--brand-primary); }
.stat-card .stat-label { font-size: 16px; color: #444; font-weight: 600; }

form { display: flex; flex-direction: column; gap: 16px; max-width: 560px; }

label { font-weight: 700; font-size: 17px; margin-bottom: 4px; display: block; }

input[type="text"], input[type="email"], input[type="password"], input[type="number"],
input[type="color"], textarea, select {
    font-size: 18px;
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: 8px;
    width: 100%;
    font-family: inherit;
    color: var(--text);
    background: #fff;
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--brand-primary);
}

.checkbox-row { display: flex; align-items: center; gap: 10px; }
.checkbox-row input { width: auto; }

button, .btn {
    font-size: 18px;
    font-weight: 700;
    padding: 14px 22px;
    border-radius: 8px;
    border: none;
    background: var(--brand-primary);
    color: #fff;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}
button:hover, .btn:hover { background: var(--brand-dark); }

.btn-secondary { background: #fff; color: var(--brand-primary); border: 2px solid var(--brand-primary); }
.btn-danger { background: var(--danger); }
.btn-small { font-size: 15px; padding: 8px 14px; }

.node-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px;
    border: 2px solid var(--border);
    border-radius: 10px;
    margin-bottom: 10px;
    background: #fff;
}
.node-row.unavailable { opacity: 0.55; }
.node-row .node-title { font-size: 19px; font-weight: 700; }
.node-row .node-meta { font-size: 15px; color: #555; }
.node-row .node-actions { display: flex; gap: 8px; }

.qr-preview img { width: 180px; height: 180px; border: 2px solid var(--border); border-radius: 8px; }

.errors { color: var(--danger); font-size: 15px; font-weight: 600; }

table { width: 100%; border-collapse: collapse; font-size: 17px; }
th, td { text-align: left; padding: 10px; border-bottom: 2px solid var(--border); }