:root {
    --bg-color: #121212;
    --panel-bg: #1e1e24;
    --text-color: #e0e0e0;
    --accent: #ff4757;
    --accent-hover: #ff6b81;
}
body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    height: 100vh;
}
.login-body {
    justify-content: center;
    align-items: center;
}
.login-container {
    background: var(--panel-bg);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    width: 350px;
    text-align: center;
    border-top: 4px solid var(--accent);
}
.login-container h2 { margin-bottom: 20px; color: var(--accent); }
.login-container input {
    width: 100%; padding: 12px; margin: 10px 0;
    border: none; border-radius: 4px;
    background: #2a2a32; color: #fff; box-sizing: border-box;
}
.login-container button {
    width: 100%; padding: 12px;
    background: var(--accent); color: #fff;
    border: none; border-radius: 4px; cursor: pointer;
    font-weight: bold; transition: 0.3s; margin-top: 10px;
}
.login-container button:hover { background: var(--accent-hover); }
.error { color: #ff4757; margin-bottom: 15px; font-weight: bold; background: rgba(255,71,87,0.1); padding: 10px; border-radius:4px; }

/* Dashboard Sidebar */
.sidebar {
    width: 250px;
    background: var(--panel-bg);
    padding: 20px 0;
    box-shadow: 2px 0 10px rgba(0,0,0,0.5);
    display: flex;
    flex-direction: column;
}
.sidebar h2 { text-align: center; color: var(--accent); margin-top: 0; font-size: 26px; }
.user-info { text-align: center; margin-bottom: 30px; }
.user-info img { width: 120px; filter: drop-shadow(0 0 5px rgba(255,255,255,0.2)); }
.user-info p { font-weight: bold; font-size: 18px; margin-top: 10px; color: #fff; }
.nav-btn {
    background: transparent; color: var(--text-color);
    border: none; padding: 15px 20px; text-align: left;
    font-size: 16px; cursor: pointer; border-left: 4px solid transparent;
    transition: 0.3s; outline: none;
}
.nav-btn:hover { background: #2a2a32; }
.nav-btn.active { background: #2a2a32; border-left-color: var(--accent); color: #fff; font-weight: bold; }
.nav-btn.logout { margin-top: auto; color: #ff4757; }
.nav-btn.logout:hover { background: #ff4757; color: #fff; }

/* Main Content */
.main-content {
    flex: 1; padding: 40px; overflow-y: auto;
}
.main-content h3 { 
    border-bottom: 2px solid var(--accent); 
    padding-bottom: 10px; margin-top:0; font-size: 24px; color: #fff;
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px; margin-top: 20px;
}
.card {
    background: var(--panel-bg);
    padding: 20px; border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    display: flex; flex-direction: column;
    border-top: 3px solid var(--accent);
    transition: transform 0.2s;
}
.card:hover { transform: translateY(-5px); }
.card span { font-size: 14px; color: #aaa; margin-bottom: 5px; text-transform: uppercase; letter-spacing: 1px; }
.card strong { font-size: 22px; color: #fff; }