:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-main: #e0e0e0;
    --text-sub: #a0a0a0;
    --accent: #2196F3;
    --accent-green: #4CAF50;
    --danger: #f44336;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 20px;
}

/* --- UTILS --- */
.hidden { display: none !important; }
.container { max-width: 1200px; margin: 0 auto; }
h1, h2, h3 { color: var(--text-main); }
.text-center { text-align: center; }

/* --- LOGIN FORM --- */
.login-wrap {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 80vh;
}
.login-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    width: 100%;
    max-width: 400px;
    text-align: center;
}
.form-group { margin-bottom: 20px; text-align: left; }
.form-group label { display: block; margin-bottom: 5px; color: var(--text-sub); }
.form-input { 
    width: 100%; padding: 10px; 
    border-radius: 5px; border: 1px solid #333; 
    background: #2b2b2b; color: #fff; box-sizing: border-box; 
}
.btn {
    background: var(--accent); color: #fff;
    padding: 12px 20px; border: none; border-radius: 5px;
    cursor: pointer; width: 100%; font-size: 1rem;
    transition: opacity 0.2s;
    text-decoration: none;
    display: inline-block;
}
.btn:hover { opacity: 0.9; }
.btn-secondary { background: #444; }

/* --- ROUTER SELECTION --- */
.router-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 50px;
}
.router-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    text-align: center;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
}
.router-card:hover {
    border-color: var(--accent);
    transform: translateY(-5px);
    background: #252525;
}
.router-icon { font-size: 3rem; margin-bottom: 10px; }
.router-name { font-size: 1.5rem; font-weight: bold; }

/* --- DASHBOARD & DEVICE LIST --- */
.header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    padding-bottom: 10px;
}
.back-btn { font-size: 0.9rem; margin-right: 10px;}

.section-title {
    margin-top: 30px;
    margin-bottom: 15px;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    border-bottom: 1px solid #333;
    padding-bottom: 5px;
}

.device-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 15px;
}

.device-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    border: 1px solid #333;
}

.device-header { display: flex; justify-content: space-between; align-items: center; }
.device-name { font-weight: 600; font-size: 1.1rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;}
.device-ip { font-size: 0.9rem; color: var(--text-sub); font-family: monospace; }

.signal-bar { height: 6px; background-color: #333; border-radius: 3px; overflow: hidden; margin-top: 5px; }
.signal-fill { height: 100%; background-color: var(--accent-green); }
.signal-weak { background-color: var(--danger); }
.signal-medium { background-color: #FFC107; }
.signal-strong { background-color: var(--accent-green); }

.policy-badge {
    background-color: #333; padding: 4px 8px; border-radius: 6px; font-size: 0.8rem;
}
.policy-vpn { background-color: rgba(33, 150, 243, 0.2); color: #64b5f6; border: 1px solid #1976D2; }

.action-btn {
    margin-top: 10px; padding: 10px; border: none; border-radius: 8px;
    font-weight: 600; cursor: pointer; width: 100%; text-align: center;
}
.btn-to-vpn { background-color: var(--accent); color: white; }
.btn-to-default { background-color: #424242; color: var(--text-main); }

.loading-state { text-align: center; padding: 50px; color: var(--text-sub); font-size: 1.2rem; }