:root {
    --bg: #ffffff;
    --text: #1f2937;
    --primary: #57B3EE;
    --primary-hover: #57B3EE;
    --secondary: #e5e7eb;
    --card: #ffffff;
    --border: #e5e7eb;
    --muted-text: #6b7280;
    --bg-secondary: #f9fafb;
    --bg-hover: #f3f4f6;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --text: #f1f5f9;
    --primary: #57B3EE;
    --primary-hover: #57B3EE;
    --secondary: #334155;
    --card: #1e293b;
    --border: #334155;
    --muted-text: #94a3b8;
    --bg-secondary: #1e293b;
    --bg-hover: #334155;
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    transition: background-color 0.3s, color 0.3s;
}

/* Navbar CSS */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 1.5rem;
    background-color: var(--card);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-item {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-item:hover {
    color: var(--primary);
}

.nav-item.primary {
    background-color: var(--primary);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
}

.nav-item.primary:hover {
    background-color: var(--primary-hover);
    color: white;
}

/* Theme Toggle Button Style */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    transition: all 0.2s;
}

.theme-toggle:hover {
    background-color: var(--bg-hover);
    color: var(--primary);
    border-color: var(--primary);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text);
    cursor: pointer;
}

/* Toast Notification */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: var(--card);
    color: var(--text);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-left: 4px solid var(--primary);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideIn 0.3s ease;
    min-width: 250px;
}

.toast.error { border-left-color: #ef4444; }
.toast.success { border-left-color: #22c55e; }
.toast i { font-size: 1.2rem; }
.toast.success i { color: #22c55e; }
.toast.error i { color: #ef4444; }

@keyframes slideIn { from { transform: translateX(100%); opacity: 0; } to { transform: translateX(0); opacity: 1; } }

/* Responsive Navbar */
@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background-color: var(--card);
        flex-direction: column;
        padding: 1rem 0;
        border-bottom: 1px solid var(--border);
        display: none;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-item {
        width: 100%;
        text-align: center;
        padding: 0.5rem 0;
    }
}