/* ===============================
   ROOT DESIGN SYSTEM
=============================== */
:root {
    --bg: #f4f6f9;
    --sidebar: #1e293b;
    --sidebar-hover: #334155;
    --text: #1e293b;
    --muted: #64748b;
    --white: #ffffff;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --border: #e5e7eb;
    --shadow: 0 10px 25px rgba(0,0,0,0.05);
}

/* ===============================
   GLOBAL
=============================== */
* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, sans-serif;
    background: linear-gradient(135deg, #f4f6f9, #eef2f7);
    color: var(--text);
}

/* ===============================
   SIDEBAR
=============================== */
.sidebar {
    width: 240px;
    height: 100vh;
    background: var(--sidebar);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    padding: 20px;
}

.sidebar h2 {
    margin-bottom: 30px;
    font-size: 20px;
    font-weight: 600;
}

.sidebar a {
    display: block;
    color: #cbd5f5;
    padding: 12px;
    margin-bottom: 6px;
    text-decoration: none;
    border-radius: 8px;
    transition: 0.2s ease;
}

.sidebar a:hover {
    background: var(--sidebar-hover);
    transform: translateX(3px);
}

/* ===============================
   MAIN CONTENT
=============================== */
.main {
    margin-left: 240px;
    padding: 30px;
}

/* ===============================
   HEADER
=============================== */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.header h2 {
    margin: 0;
    font-size: 24px;
}

/* ===============================
   BADGE
=============================== */
.badge {
    background: var(--success);
    color: white;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
}

/* ===============================
   CARD
=============================== */
.card {
    background: var(--white);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 15px;
}

/* ===============================
   FORM ELEMENTS
=============================== */
input, select {
    width: 100%;
    padding: 10px;
    margin-top: 6px;
    margin-bottom: 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    outline: none;
    transition: 0.2s;
}

input:focus, select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.1);
}

/* ===============================
   BUTTONS
=============================== */
button {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: 0.2s ease;
}

button:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

/* ===============================
   ALERTS
=============================== */
.card.success {
    background: #ecfdf5;
    color: #065f46;
}

.card.error {
    background: #fef2f2;
    color: #991b1b;
}

/* ===============================
   RESPONSIVE
=============================== */
@media (max-width: 768px) {
    .sidebar {
        position: relative;
        width: 100%;
        height: auto;
    }

    .main {
        margin-left: 0;
        padding: 15px;
    }
}