:root {
    /* Soft color palette */
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #10B981;
    --bg-color: #F9FAFB;
    --card-bg: #FFFFFF;
    --text-main: #111827;
    --text-muted: #6B7280;
    --border-color: #E5E7EB;
    --danger-color: #EF4444;
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    --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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --border-radius: 12px;
}

body.dark-mode {
    --primary-color: #818CF8;
    --primary-hover: #6366F1;
    --secondary-color: #34D399;
    --bg-color: #111827;
    --card-bg: #1F2937;
    --text-main: #F9FAFB;
    --text-muted: #9CA3AF;
    --border-color: #374151;
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

.app-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Helpers */
.text-primary { color: var(--primary-color); }
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-4 { margin-bottom: 2rem; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    font-family: var(--font-body);
    font-weight: 600;
    border-radius: var(--border-radius);
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #FFF;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
}
.btn-outline:hover {
    background-color: var(--primary-color);
    color: #FFF;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}
.btn-danger:hover { background-color: #DC2626; }

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    box-shadow: var(--shadow-sm);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-family: var(--font-heading);
    font-weight: 700;
    text-decoration: none;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.2s;
}

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

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

.theme-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    transition: color 0.2s;
}
.theme-toggle:hover {
    color: var(--primary-color);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.95rem;
}

.form-control {
    width: 100%;
    padding: 0.85rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all 0.25s ease;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.02);
}

.form-control::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.form-control:hover {
    border-color: #D1D5DB;
}

body.dark-mode .form-control:hover {
    border-color: #4B5563;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.15);
    background-color: var(--card-bg);
}

/* Modern Select Dropdowns */
select.form-control {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 1.25rem center;
    background-size: 1.25em;
    padding-right: 3rem;
    cursor: pointer;
}

select.form-control:focus {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234F46E5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='18 15 12 9 6 15'%3e%3c/polyline%3e%3c/svg%3e");
}

body.dark-mode select.form-control {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239CA3AF' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
}

body.dark-mode select.form-control:focus {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23818CF8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='18 15 12 9 6 15'%3e%3c/polyline%3e%3c/svg%3e");
}

select.form-control option {
    background-color: var(--card-bg);
    color: var(--text-main);
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: background-color 0.3s ease;
}

.auth-container {
    max-width: 450px;
    margin: 4rem auto;
}

/* Responsive */
@media (max-width: 992px) {
    /* Tablet */
    .dashboard-layout,
    [style*="grid-template-columns: 2fr 1fr"] {
        grid-template-columns: 1fr !important;
    }
}

@media (max-width: 768px) {
    /* Mobile */
    .container {
        padding: 0 1rem;
    }
    
    h1 { font-size: 2rem !important; }
    h2 { font-size: 1.5rem !important; }
    
    .card {
        padding: 1.5rem;
    }

    .features-grid {
        grid-template-columns: 1fr !important;
    }

    .menu-toggle {
        display: block;
    }
    .nav-menu {
        display: none; /* simple toggle via JS */
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--card-bg);
        padding: 1rem;
        box-shadow: var(--shadow-md);
        gap: 1rem;
        text-align: center;
    }
    .nav-menu.active {
        display: flex;
    }
    
    .btn {
        width: 100%;
        text-align: center;
        margin-bottom: 0.5rem;
    }
    
    /* Make inline grids stack on mobile (like the habit dates and categories forms) */
    [style*="grid-template-columns: 1fr 1fr"] {
        grid-template-columns: 1fr !important;
    }
    
    /* Header action buttons alignment */
    .header-actions {
        flex-direction: column;
        align-items: flex-start !important;
        gap: 1rem;
    }
    
    /* Responsive Tables */
    table {
        display: block;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}