:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #10b981;
    --danger-color: #ef4444;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f3f4f6;
    --card-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.4);
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --font-main: 'Inter', sans-serif;
    --transition: all 0.3s ease;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    background-image: radial-gradient(at 0% 0%, hsla(253,16%,7%,1) 0, transparent 50%), radial-gradient(at 50% 0%, hsla(225,39%,30%,1) 0, transparent 50%), radial-gradient(at 100% 0%, hsla(339,49%,30%,1) 0, transparent 50%);
    background-size: cover;
    background-attachment: fixed;
    min-height: 100vh;
}

/* Auth Container */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.auth-box {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

/* App Layout */
#app {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    display: none; /* Hidden by default until login check */
}

/* Navigation */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    border-radius: 1rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    margin: 0 1rem;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
}

nav a:hover, nav a.active {
    color: var(--primary-color);
}

/* Sections */
section {
    display: none;
    animation: fadeIn 0.5s ease-out;
}

section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Cards */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.9);
    padding: 1.5rem;
    border-radius: 0.75rem;
    text-align: center;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    color: var(--text-light);
    font-size: 0.875rem;
}

/* Forms */
form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

input, select, textarea {
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    font-family: inherit;
    transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

button {
    padding: 0.75rem 1.5rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

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

/* Lists/Tables */
.list-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.list-item:last-child {
    border-bottom: none;
}

/* Utilities */
.text-success { color: var(--secondary-color); }
.text-danger { color: var(--danger-color); }
.hidden { display: none !important; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.items-center { align-items: center; }
.gap-4 { gap: 1rem; }

/* Responsive */
@media (max-width: 768px) {
    nav {
        flex-direction: column;
        gap: 1rem;
    }
}