:root {
    --primary-color: #1a73e8; /* Google Blue */
    --primary-hover: #1557b0;
    --success-color: #1e8e3e; /* Google Green */
    --danger-color: #d93025;  /* Google Red */
    --text-color: #202124;    /* Google Dark Grey */
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --background-color: #f0f2f5; /* Light grey background */
    --surface-color: #ffffff;
    --surface-hover: #f1f3f4;
    --card-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
    --border-radius: 8px;     /* More subtle rounding */
    --transition: all 0.2s ease-in-out;
    
    /* Alert Variables */
    --alert-danger-bg: #fce8e6;
    --alert-danger-color: #c5221f;
    --alert-danger-border: #fad2cf;
    --alert-success-bg: #e6f4ea;
    --alert-success-color: #137333;
    --alert-success-border: #ceead6;
    --alert-warning-bg: #fef7e0;
    --alert-warning-color: #ea8600;
    --alert-warning-border: #fce8b2;
    --hover-bg: #f8f9fa;
    --accent-bg: #e8f0fe;
    --on-primary: #ffffff;
    --progress-bg: #e0e0e0;
    --switch-off-bg: #bdc1c6;
}

[data-theme="dark"] {
    --primary-color: #8ab4f8;
    --primary-hover: #aecbfa;
    --success-color: #81c995;
    --danger-color: #f28b82;
    --text-color: #e8eaed;
    --text-secondary: #9aa0a6;
    --border-color: #5f6368;
    --background-color: #202124;
    --surface-color: #292a2d; /* Slightly lighter than background */
    --surface-hover: #3c4043;
    --card-shadow: 0 1px 2px 0 rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);

    /* Alert Variables Dark */
    --alert-danger-bg: #410e0b;
    --alert-danger-color: #f28b82;
    --alert-danger-border: #8c1d18;
    --alert-success-bg: #0c3b19;
    --alert-success-color: #81c995;
    --alert-success-border: #0f5123;
    --alert-warning-bg: #3e2e04;
    --alert-warning-color: #fdd663;
    --alert-warning-border: #806109;
    --accent-bg: rgba(138, 180, 248, 0.1);
    --hover-bg: #3c4043;
    --on-primary: #202124;
    --progress-bg: #3c4043;
    --switch-off-bg: #5f6368;
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background: var(--background-color);
    min-height: 100vh;
    color: var(--text-color);
    font-size: 14px;
    line-height: 1.5;
}

/* Utilities Overrides */
h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6 {
    color: var(--text-color);
}

.text-muted {
    color: var(--text-secondary) !important;
}

.text-secondary {
    color: var(--text-secondary) !important;
}

.text-primary {
    color: var(--primary-color) !important;
}

.text-success {
    color: var(--success-color) !important;
}

.text-danger {
    color: var(--danger-color) !important;
}

.text-warning {
    color: var(--alert-warning-color) !important;
}

label, .form-label {
    color: var(--text-color);
}

.card {
    background-color: var(--surface-color);
    color: var(--text-color);
}

.bg-light {
    background-color: var(--background-color) !important;
}

.bg-white {
    background-color: var(--surface-color) !important;
}

/* Navbar Styling */
.navbar-modern {
    background: var(--surface-color) !important;
    padding: 0.8rem 0;
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
    border-bottom: 1px solid var(--border-color);
}

.navbar-modern .navbar-brand {
    font-weight: 500;
    font-size: 1.3rem;
    letter-spacing: 0;
    color: var(--text-secondary) !important;
}

.navbar-modern .navbar-brand i {
    color: var(--primary-color);
}

.navbar-modern .text-white {
    color: var(--text-secondary) !important;
}

.navbar-modern .btn-outline-light {
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    background: var(--surface-color);
    font-weight: 500;
    padding: 0.4rem 1rem;
}

.navbar-modern .btn-outline-light:hover {
    background: var(--surface-hover);
    color: var(--text-color);
    border-color: var(--border-color);
    transform: none;
}

/* Card Styling */
.card-modern {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: none;
    transition: none;
    overflow: visible;
}

.card-modern:hover {
    box-shadow: none;
    transform: none;
}

.card-modern .card-header {
    background: var(--surface-color);
    border: none;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    border-radius: calc(var(--border-radius) - 1px) calc(var(--border-radius) - 1px) 0 0;
}

.card-modern .card-header h5 {
    font-family: 'Google Sans', 'Roboto', sans-serif;
    font-weight: 400;
    color: var(--text-color);
    font-size: 1.125rem;
    margin: 0;
}

.card-modern .card-body {
    padding: 1.5rem;
}

/* Form Styling */
.form-control-modern {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.5rem 0.75rem;
    font-size: 1rem;
    transition: all 0.2s;
    color: var(--text-color);
    background-color: var(--surface-color);
}

.form-control-modern:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
    outline: none;
    background-color: var(--surface-color);
    color: var(--text-color);
}

.form-control-modern:disabled, .form-control-modern[readonly] {
    background-color: var(--hover-bg);
    opacity: 1;
    color: var(--text-secondary);
}

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

.form-label-modern {
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

/* Button Styling */
.btn-modern {
    border-radius: 4px;
    padding: 0.5rem 1.5rem; /* Compact padding */
    font-weight: 500;
    font-size: 0.875rem;
    transition: background-color 0.2s;
    border: 1px solid transparent;
    letter-spacing: 0.2px;
    box-shadow: none;
}

.btn-modern:focus {
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.4);
}

.btn-primary-modern {
    background: var(--primary-color);
    color: var(--on-primary);
    border-color: var(--primary-color);
}

.btn-primary-modern:hover {
    background: var(--primary-hover);
    transform: none;
    box-shadow: 0 1px 2px rgba(60,64,67,0.3);
}

.btn-success-modern {
    background: var(--success-color);
    color: var(--on-primary);
}

.btn-success-modern:hover {
    background: #137333; /* Darker green */
    transform: none;
    box-shadow: 0 1px 2px rgba(60,64,67,0.3);
}

.btn-danger-modern {
    background: var(--danger-color);
    color: var(--on-primary);
}

.btn-danger-modern:hover {
    background: #c5221f; /* Darker red */
    transform: none;
    box-shadow: 0 1px 2px rgba(60,64,67,0.3);
}

.btn-outline-modern {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--primary-color);
}

.btn-outline-modern:hover {
    background: var(--surface-hover);
    border-color: #d2e3fc;
    color: #1967d2;
    transform: none;
}

/* Badge Styling */
.badge-modern {
    border-radius: 16px;
    padding: 0.25rem 0.75rem;
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.2px;
}

/* Hero Section */
.hero-section {
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 1rem;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: 400;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Feature Cards */
.feature-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    transition: all 0.2s;
    height: 100%;
}

.feature-card:hover {
    border-color: #bdc1c6;
    background-color: var(--surface-color);
    box-shadow: 0 1px 3px rgba(60,64,67,0.3);
}

.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--accent-bg);
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
}

/* Modal Styling */
.modal-modern .modal-content {
    background: var(--surface-color);
    color: var(--text-color);
    border-radius: var(--border-radius);
    border: none;
    box-shadow: 0 1px 3px rgba(60,64,67,0.3), 0 4px 8px 3px rgba(60,64,67,0.15);
}

.modal-modern .modal-body {
    padding: 2rem;
}

/* Progress Bar */
.progress-modern {
    height: 4px;
    border-radius: 2px;
    background: var(--progress-bg);
    overflow: hidden;
}

.progress-modern .progress-bar {
    background: var(--primary-color);
    transition: width 0.3s ease;
}

/* Table Styling */
.table-modern {
    overflow: visible;
    margin-bottom: 0;
}

.table-modern th {
    background-color: var(--hover-bg);
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: none;
    font-size: 0.875rem;
    padding: 0.75rem 1rem;
    border: none;
}

.table-modern tbody tr {
    border-bottom: 1px solid var(--border-color);
}

.table-modern tbody tr:last-child {
    border-bottom: none;
}

.table-modern tbody tr:hover td {
    background-color: var(--hover-bg);
}

.table-modern tbody td {
    background-color: var(--surface-color);
    padding: 0.75rem 1rem;
    vertical-align: middle;
    color: var(--text-color);
    border: none;
    font-size: 0.875rem;
}

.card-modern .table-modern tbody tr:last-child td:first-child {
    border-bottom-left-radius: var(--border-radius);
}

.card-modern .table-modern tbody tr:last-child td:last-child {
    border-bottom-right-radius: var(--border-radius);
}

/* Alert Styling */
.alert-modern {
    border-radius: 4px;
    border: 1px solid transparent;
    padding: 0.75rem 1rem;
    box-shadow: none;
    font-size: 0.875rem;
}

.alert-danger-modern {
    background: var(--alert-danger-bg);
    color: var(--alert-danger-color);
    border-color: var(--alert-danger-border);
}

.alert-success-modern {
    background: var(--alert-success-bg);
    color: var(--alert-success-color);
    border-color: var(--alert-success-border);
}

.alert-warning-modern {
    background: var(--alert-warning-bg);
    color: var(--alert-warning-color);
    border-color: var(--alert-warning-border);
}

/* Auth Container */
.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.auth-card {
    background: var(--surface-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    box-shadow: none;
    padding: 3rem 2rem;
    width: 100%;
    max-width: 450px;
}

.auth-card h3 {
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: 2rem;
    font-family: 'Google Sans', 'Roboto', sans-serif;
}

/* Switch Styling */
.form-switch-modern .form-check-input {
    width: 2.5rem;
    height: 1.25rem;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background-color: var(--switch-off-bg);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='%23fff'/%3e%3c/svg%3e");
}

.form-switch-modern .form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-switch-modern .form-check-input:focus {
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
    border-color: var(--primary-color);
}

.form-switch-modern .form-check-label {
    font-weight: 400;
    color: var(--text-color);
    margin-left: 0.5rem;
}

/* Dropdown Menu */
.dropdown {
    position: relative;
}

.dropdown-menu-modern {
    background: var(--surface-color);
    border-radius: 4px;
    border: none;
    box-shadow: 0 2px 6px 2px rgba(60,64,67,0.15), 0 1px 2px 0 rgba(60,64,67,0.3);
    padding: 0.5rem 0;
    min-width: 200px;
    margin-top: 0.125rem;
    z-index: 9999;
}

.dropdown-menu-modern form {
    margin: 0;
}

.dropdown-menu-modern .dropdown-item {
    border-radius: 0;
    padding: 0.5rem 1rem;
    transition: background-color 0.2s;
    font-weight: 400;
    background: transparent;
    border: none;
    width: 100%;
    text-align: left;
    cursor: pointer;
    display: block;
    color: var(--text-color);
    font-size: 0.875rem;
}

.dropdown-menu-modern .dropdown-item:hover:not(:disabled) {
    background: var(--accent-bg);
    color: var(--primary-color);
}

.dropdown-menu-modern .dropdown-item:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.fade-in {
    animation: fadeIn 0.4s ease-out;
}

/* Spinner */
.spinner-modern {
    border: 3px solid #f3f3f3;
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .auth-card {
        padding: 1.5rem;
        box-shadow: none;
        border: none;
        background: transparent;
    }
    
    .card-modern .card-body {
        padding: 1rem;
    }

    /* Mobile adjustments for Google feel */
    .navbar-modern {
        padding: 0.5rem 0;
    }
}

/* Utilities */
.text-gradient {
    color: var(--primary-color);
    background: none;
    -webkit-text-fill-color: initial;
}

.glass-effect {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
}