:root {
    /* Dark Theme (Default) */
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #38bdf8;
    --border: rgba(255, 255, 255, 0.08);
    --hover-glow: rgba(56, 189, 248, 0.15);
    --grad-1: rgba(56, 189, 248, 0.1);
    --grad-2: rgba(139, 92, 246, 0.1);
    --input-bg: rgba(0,0,0,0.3);
}

[data-theme="light"] {
    /* Light Theme - Clean SaaS Look */
    --bg-color: #f1f5f9; /* Slate 100 */
    --card-bg: rgba(255, 255, 255, 0.85);
    --text-primary: #1e293b; /* Slate 800 */
    --text-secondary: #64748b; /* Slate 500 */
    --accent: #0284c7; /* Sky 600 */
    --border: rgba(0, 0, 0, 0.06);
    --hover-glow: rgba(2, 132, 199, 0.1);
    --grad-1: rgba(14, 165, 233, 0.05);
    --grad-2: rgba(139, 92, 246, 0.05);
    --input-bg: rgba(255,255,255,0.8);
}

body {
    background-color: var(--bg-color);
    background-image: radial-gradient(at 0% 0%, var(--grad-1) 0px, transparent 50%),
                      radial-gradient(at 100% 100%, var(--grad-2) 0px, transparent 50%);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--text-primary);
    margin: 0; padding: 40px; min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

.container { max-width: 1200px; margin: 0 auto; }

header {
    margin-bottom: 50px; padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: end;
}

h1 { font-weight: 800; letter-spacing: -1px; margin: 0; font-size: 2.5rem; }
.subtitle { color: var(--text-secondary); margin-top: 5px; font-size: 1rem; }

/* Buttons */
.nav-btn {
    color: var(--text-secondary); text-decoration: none; font-size: 0.9rem;
    padding: 8px 12px; border: 1px solid var(--border); border-radius: 6px;
    margin-left: 8px; transition:0.2s; background: var(--card-bg); cursor: pointer;
}
.nav-btn:hover { border-color: var(--accent); color: var(--text-primary); }

/* Theme Toggle Button specific */
.theme-btn { font-size: 1.1rem; padding: 6px 10px; line-height: 1; }

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px; padding: 24px;
    text-decoration: none; color: inherit;
    transition: all 0.3s; backdrop-filter: blur(12px);
    display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 20px 40px -15px rgba(0,0,0,0.1); }

.card-icon {
    width: 54px; height: 54px; margin-bottom: 20px; border-radius: 14px;
    background: var(--bg-color); padding: 10px; object-fit: contain;
    border: 1px solid var(--border);
}
.card-title { font-size: 1.25rem; font-weight: 600; margin: 0 0 6px 0; display: flex; justify-content: space-between; align-items: center; }
.card-desc { font-size: 0.9rem; color: var(--text-secondary); margin: 0; line-height: 1.5; }
.category { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--text-secondary); margin-bottom: 8px; opacity: 0.8; }

.status { width: 10px; height: 10px; border-radius: 50%; background-color: #94a3b8; display: inline-block; }
.status.online { background-color: #4ade80; box-shadow: 0 0 10px #4ade80; }
.status.offline { background-color: #f87171; }

/* Forms & Modal */
input, select, textarea {
    background: var(--input-bg);
    border: 1px solid var(--border);
    color: var(--text-primary);
}
.manage-container { background: var(--card-bg); border: 1px solid var(--border); }
th { color: var(--text-secondary); border-bottom: 2px solid var(--border); }
td { border-bottom: 1px solid var(--border); }
.modal { background: var(--card-bg); color: var(--text-primary); border: 1px solid var(--border); }