:root { 
    --text: #172B4D; 
    --text-sub: #5E6C84;
    --bg: #F4F5F7; 
    --card-bg: #FFFFFF; 
    --border: #DFE1E6; 
    --primary: #0052CC; 
    --primary-hover: #0065FF; 
    --danger: #DE350B; 
    --danger-hover: #FF5630;
    --nav-bg: #0747A6;
}

body { 
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif; 
    background: var(--bg); color: var(--text); 
    margin: 0; padding: 0; min-height: 100vh; 
    display: flex; flex-direction: column;
}

.navbar {
    background: var(--nav-bg); color: white; padding: 12px 24px;
    display: flex; justify-content: space-between; align-items: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.navbar h1 { margin: 0; font-size: 18px; font-weight: 500; display: flex; align-items: center; gap: 8px;}

.main-content {
    display: grid; grid-template-columns: 350px 1fr; gap: 24px;
    padding: 24px; max-width: 1200px; margin: 0 auto; width: 100%;
    box-sizing: border-box; flex: 1;
}

.card { 
    background: var(--card-bg); border: 1px solid var(--border); 
    border-radius: 3px; box-shadow: 0 1px 2px rgba(9, 30, 66, 0.25); padding: 20px; 
}

h2 { font-size: 16px; font-weight: 600; margin-top: 0; margin-bottom: 16px; border-bottom: 1px solid var(--border); padding-bottom: 10px;}
label { display: block; font-size: 12px; font-weight: 600; color: var(--text-sub); margin-bottom: 4px; margin-top: 12px; }

input[type="text"], input[type="password"] { 
    width: 100%; padding: 8px 12px; margin-bottom: 8px; border: 2px solid var(--border); 
    border-radius: 3px; font-size: 14px; box-sizing: border-box; background: var(--bg); transition: 0.2s; color: var(--text);
}
input:focus { border-color: #4C9AFF; outline: none; background: #FFF; }

.generator-options { background: rgba(9, 30, 66, 0.04); padding: 12px; border-radius: 3px; margin-bottom: 16px; }
.checkbox-group { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }
.checkbox-item { display: flex; align-items: center; gap: 4px; font-size: 13px; cursor: pointer; margin: 0; }
input[type="range"] { width: 100%; cursor: pointer; }

button { 
    padding: 8px 12px; border: none; border-radius: 3px; cursor: pointer; 
    font-size: 14px; font-weight: 500; transition: background 0.2s; width: 100%;
}
button.primary { background: var(--primary); color: #FFF; }
button.primary:hover { background: var(--primary-hover); }
button.danger { background: var(--danger); color: #FFF; }
button.danger:hover { background: var(--danger-hover); }
button.default { background: rgba(9, 30, 66, 0.04); color: var(--text); border: 1px solid var(--border); }
button.default:hover { background: rgba(9, 30, 66, 0.08); }

.item { 
    display: flex; justify-content: space-between; align-items: center; 
    border: 1px solid var(--border); padding: 12px 16px; margin-bottom: 8px; 
    border-radius: 3px; background: #FFF; transition: 0.2s;
}
.item:hover { box-shadow: 0 2px 4px rgba(0,0,0,0.1); border-color: #4C9AFF; }
.item-title { font-weight: 500; font-size: 14px; display: flex; align-items: center; gap: 8px; }
.actions { display: flex; gap: 8px; }

.centered-view { display: flex; justify-content: center; align-items: center; flex: 1; padding: 20px; }
.centered-card { max-width: 400px; width: 100%; text-align: center; }

.hidden { display: none !important; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.mt-3 { margin-top: 12px; }
.m-0 { margin: 0; }
.text-left { text-align: left; }
.subtitle { font-size: 13px; color: var(--text-sub); }
.align-start { align-self: start; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.len-indicator { font-size: 12px; font-weight: bold; color: var(--primary); }
.btn-small { width: auto; padding: 4px 12px; font-size: 13px; }

@media (max-width: 768px) { .main-content { grid-template-columns: 1fr; } }