:root {
    --bg-color: #0d1117;
    --sidebar-bg: #161b22;
    --card-bg: rgba(22, 27, 34, 0.7);
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --accent-hover: #1f6feb;
    --danger-color: #f85149;
    --success-color: #2ea043;
    
    --glow: 0 0 15px rgba(88, 166, 255, 0.2);
    --glass-blur: 12px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    background-image: radial-gradient(circle at top right, rgba(88, 166, 255, 0.1), transparent 400px);
    background-attachment: fixed;
}

/* Typography */
h1, h2, h3, h4 { color: var(--text-primary); font-weight: 600; margin-bottom: 1rem; }
p { color: var(--text-secondary); }
a { color: var(--accent-color); text-decoration: none; transition: 0.2s; }
a:hover { color: var(--accent-hover); }

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: 2rem 3rem;
    overflow-y: auto;
}

/* Glass & UI Elements */
.glass-panel {
    background: var(--card-bg);
    backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

/* Buttons and Inputs */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
}

.btn-primary { background-color: var(--accent-hover); color: white; }
.btn-primary:hover { background-color: #388bfd; box-shadow: var(--glow); }
.btn-block { width: 100%; display: block; text-align: center; }

.form-group { margin-bottom: 1rem; }
.form-group label { display: block; margin-bottom: 0.5rem; color: var(--text-primary); font-size: 0.9rem; }
.form-control {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background-color: #010409;
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: 0.2s;
}
.form-control:focus { outline: none; border-color: var(--accent-color); box-shadow: var(--glow); }

/* Tables */
.table-wrapper {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}
th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
th {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
tbody tr { transition: background-color 0.2s ease; }
tbody tr:hover { background-color: rgba(255, 255, 255, 0.03); }

/* Rank Badges */
.badge {
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
}
.badge-R5 { background-color: #e34c26; color: white; }
.badge-R4 { background-color: #f1e05a; color: #24292e; }
.badge-R3 { background-color: #563d7c; color: white; }
.badge-R2 { background-color: #007acc; color: white; }
.badge-R1 { background-color: #707a7c; color: white; }
.badge-removed { background-color: var(--danger-color); color: white; }
.badge-active { background-color: var(--success-color); color: white; }

/* Navigation */
.logo { margin-bottom: 2rem; font-size: 1.5rem; font-weight: 700; text-align: center; }
.logo span { color: var(--accent-color); }
.nav-menu { list-style: none; }
.nav-item { margin-bottom: 0.5rem; }
.nav-link {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    color: var(--text-secondary);
    font-weight: 500;
    transition: all 0.2s ease;
}
.nav-link:hover, .nav-link.active {
    background-color: rgba(255,255,255,0.05);
    color: var(--text-primary);
}
.nav-link.active { border-left: 3px solid var(--accent-color); padding-left: calc(1rem - 3px); }

/* Chart Container */
.chart-container {
    width: 100%;
    height: 400px;
    margin-bottom: 2rem;
}

/* User Profile Badge (Sidebar) */
.user-info {
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}
.user-info p { margin-bottom: 0.5rem; font-size: 0.9rem; }

/* Login */
.login-bg {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
}
.login-container {
    width: 100%;
    max-width: 400px;
}
.login-title { text-align: center; margin-bottom: 0.5rem; }
.login-subtitle { text-align: center; margin-bottom: 2rem; font-size: 0.9rem; }
.alert-danger { padding: 0.75rem; background-color: rgba(248, 81, 73, 0.1); color: var(--danger-color); border-left: 4px solid var(--danger-color); margin-bottom: 1.5rem; border-radius: 4px; }