/* Fluent UI Design Tokens and Theme */
:root {
    /* Fluent Design System Colors */
    --primary-color: #0078d4;
    --primary-hover: #106ebe;
    --primary-active: #005a9e;
    --secondary-color: #605e5c;
    --success-color: #107c10;
    --warning-color: #f7630c;
    --danger-color: #d13438;
    --info-color: #0078d4;
    
    /* Neutral Colors (Light Theme Default) */
    --neutral-bg: #ffffff;
    --neutral-bg-secondary: #faf9f8;
    --neutral-bg-tertiary: #f3f2f1;
    --neutral-border: #edebe9;
    --neutral-stroke: #d2d0ce;
    --neutral-foreground-1: #201f1e;
    --neutral-foreground-2: #323130;
    --neutral-foreground-3: #605e5c;
    
    /* Dark Theme Base Tokens (will be mapped in media query) */
    --dark-bg: #1b1a19;
    --dark-bg-secondary: #252423;
    --dark-bg-tertiary: #323130;
    --dark-border: #3b3a39;
    --dark-stroke: #4a4847;
    --dark-foreground-1: #f3f2f1;
    --dark-foreground-2: #d2d0ce;
    --dark-foreground-3: #979593;
    
    /* Typography */
    --font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', sans-serif;
    --font-size-base: 14px;
    --font-size-large: 18px;
    --font-size-xlarge: 24px;
    --font-size-xxlarge: 32px;
    --font-weight-regular: 400;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    --spacing-xxxl: 32px;
    
    /* Border Radius */
    --border-radius-sm: 2px;
    --border-radius-md: 4px;
    --border-radius-lg: 8px;
    
    /* Shadows */
    --shadow-sm: 0 1.6px 3.6px 0 rgba(0, 0, 0, 0.132), 0 0.3px 0.9px 0 rgba(0, 0, 0, 0.108);
    --shadow-md: 0 3.2px 7.2px 0 rgba(0, 0, 0, 0.132), 0 0.6px 1.8px 0 rgba(0, 0, 0, 0.108);
    --shadow-lg: 0 6.4px 14.4px 0 rgba(0, 0, 0, 0.132), 0 1.2px 3.6px 0 rgba(0, 0, 0, 0.108);

    color-scheme: light dark;
}

/* System Dark Mode Mapping */
@media (prefers-color-scheme: dark) {
    :root {
        --neutral-bg: var(--dark-bg);
        --neutral-bg-secondary: var(--dark-bg-secondary);
        --neutral-bg-tertiary: var(--dark-bg-tertiary);
        --neutral-border: var(--dark-border);
        --neutral-stroke: var(--dark-stroke);
        --neutral-foreground-1: var(--dark-foreground-1);
        --neutral-foreground-2: var(--dark-foreground-2);
        --neutral-foreground-3: var(--dark-foreground-3);
    }

    body {
        background-color: var(--neutral-bg-secondary);
    }

    .fluent-card {
        box-shadow: 0 1px 3px rgba(0,0,0,.6);
    }

    .navbar {
        box-shadow: 0 2px 4px rgba(0,0,0,.7);
    }

    .form-control, .btn-secondary {
        background-color: var(--neutral-bg);
        color: var(--neutral-foreground-1);
    }
}

/* Global Styles */
* { box-sizing: border-box; }

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--neutral-foreground-1);
    background-color: var(--neutral-bg-secondary);
    line-height: 1.5;
    transition: background-color .25s ease, color .25s ease;
}

/* Container */
.main-container { max-width: 1200px; margin: 0 auto; padding: var(--spacing-xxxl) var(--spacing-lg); }

/* Typography */
h1 { font-size: var(--font-size-xxlarge); font-weight: var(--font-weight-semibold); color: var(--neutral-foreground-1); margin: 0 0 var(--spacing-md) 0; }

h2 {
    font-size: var(--font-size-xlarge);
    font-weight: var(--font-weight-semibold);
    color: var(--neutral-foreground-1);
    margin: 0 0 var(--spacing-md) 0;
}

h3 {
    font-size: var(--font-size-large);
    font-weight: var(--font-weight-semibold);
    color: var(--neutral-foreground-2);
    margin: 0 0 var(--spacing-sm) 0;
}

p {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--neutral-foreground-2);
}

/* Lead Section */
.lead {
    margin-bottom: var(--spacing-xxxl);
}

.lead h1 {
    margin-bottom: var(--spacing-sm);
}

.lead p {
    font-size: var(--font-size-large);
    color: var(--neutral-foreground-3);
}

/* Card Component */
.fluent-card {
    background: var(--neutral-bg);
    border: 1px solid var(--neutral-border);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.fluent-card-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--neutral-bg-tertiary);
    border-bottom: 1px solid var(--neutral-border);
}

.fluent-card-header h2 {
    margin: 0;
    font-size: var(--font-size-large);
    font-weight: var(--font-weight-semibold);
}

.fluent-card-body {
    padding: var(--spacing-xl);
}

/* Form Elements */
.form-group {
    margin-bottom: var(--spacing-xl);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--neutral-foreground-2);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    border: 1px solid var(--neutral-stroke);
    border-radius: var(--border-radius-md);
    background: var(--neutral-bg);
    color: var(--neutral-foreground-1);
    transition: all 0.2s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.2);
}

.form-control::placeholder {
    color: var(--neutral-foreground-3);
}

.form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-check-input {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.form-check-label {
    cursor: pointer;
    user-select: none;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    border: 1px solid transparent;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    gap: var(--spacing-sm);
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-primary:active {
    background-color: var(--primary-active);
}

.btn-secondary {
    background-color: var(--neutral-bg);
    border-color: var(--neutral-stroke);
    color: var(--neutral-foreground-1);
}

.btn-secondary:hover {
    background-color: var(--neutral-bg-tertiary);
    border-color: var(--neutral-foreground-3);
}

.btn-outline-info {
    background-color: transparent;
    border-color: var(--info-color);
    color: var(--info-color);
}

.btn-outline-info:hover {
    background-color: var(--info-color);
    color: white;
}

/* Alert Component */
.alert {
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-md);
    margin-bottom: var(--spacing-xl);
    border-left: 4px solid;
}

.alert-info {
    background-color: rgba(0, 120, 212, 0.1);
    border-left-color: var(--info-color);
    color: var(--neutral-foreground-1);
}

.alert-warning {
    background-color: rgba(247, 99, 12, 0.1);
    border-left-color: var(--warning-color);
    color: var(--neutral-foreground-1);
}

.alert-danger {
    background-color: rgba(209, 52, 56, 0.1);
    border-left-color: var(--danger-color);
    color: var(--neutral-foreground-1);
}

.alert strong {
    font-weight: var(--font-weight-semibold);
}

/* Grid System */
.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(-1 * var(--spacing-md));
}

.col-sm-4,
.col-sm-6,
.col-sm-8,
.col-lg-auto {
    padding: 0 var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.col-sm-4 {
    flex: 0 0 100%;
    max-width: 100%;
}

.col-sm-6 {
    flex: 0 0 100%;
    max-width: 100%;
}

.col-sm-8 {
    flex: 0 0 100%;
    max-width: 100%;
}

@media (min-width: 576px) {
    .col-sm-4 {
        flex: 0 0 33.333333%;
        max-width: 33.333333%;
    }
    
    .col-sm-6 {
        flex: 0 0 50%;
        max-width: 50%;
    }
    
    .col-sm-8 {
        flex: 0 0 66.666667%;
        max-width: 66.666667%;
    }
}

/* List Styles */
.list-inline {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.list-inline-item {
    display: inline-block;
}

.list-group {
    list-style: none;
    padding: 0;
    margin: 0;
}

.list-group-item {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--neutral-border);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

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

/* Navigation */
.navbar {
    background-color: var(--neutral-bg);
    color: var(--neutral-foreground-1);
    padding: var(--spacing-lg) var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-bottom: 1px solid var(--neutral-border);
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    color: var(--neutral-foreground-1);
    font-size: var(--font-size-large);
    font-weight: var(--font-weight-semibold);
}

.navbar-brand:hover {
    color: var(--neutral-foreground-1);
}

.navbar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--neutral-foreground-1);
    text-decoration: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-md);
}

.nav-link:hover {
    background-color: var(--neutral-bg-tertiary);
    color: var(--neutral-foreground-1);
}

/* Fluent 2 Profile Menu */
.profile-menu {
    position: relative;
}

.profile-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xs) var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: background-color 0.2s ease;
    font-family: var(--font-family);
    color: var(--neutral-foreground-1);
}

.profile-button:hover {
    background-color: var(--neutral-bg-tertiary);
}

.profile-button:active {
    background-color: var(--neutral-bg-secondary);
}

.profile-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.avatar-initials {
    color: white;
    font-size: 14px;
    font-weight: var(--font-weight-semibold);
    user-select: none;
}

.profile-name {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    max-width: 150px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.chevron-icon {
    color: var(--neutral-foreground-3);
    transition: transform 0.2s ease;
    flex-shrink: 0;
}

.profile-button:hover .chevron-icon {
    color: var(--neutral-foreground-2);
}

/* Profile Dropdown */
.profile-dropdown {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    right: 0;
    width: 280px;
    background: var(--neutral-bg);
    border: 1px solid var(--neutral-border);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.14), 0 0 2px rgba(0, 0, 0, 0.12);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    z-index: 1000;
}

.profile-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.profile-dropdown-header {
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.profile-avatar-large {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.profile-avatar-large .avatar-initials {
    font-size: 20px;
}

.profile-info {
    flex: 1;
    min-width: 0;
}

.profile-display-name {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--neutral-foreground-1);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.profile-email {
    font-size: 12px;
    color: var(--neutral-foreground-3);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-top: 2px;
}

.profile-dropdown-divider {
    height: 1px;
    background-color: var(--neutral-border);
    margin: 0;
}

.profile-dropdown-items {
    padding: var(--spacing-sm) 0;
}

.profile-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--neutral-foreground-1);
    text-decoration: none;
    font-size: var(--font-size-base);
    transition: background-color 0.1s ease;
    cursor: pointer;
}

.profile-dropdown-item:hover {
    background-color: var(--neutral-bg-tertiary);
}

.profile-dropdown-item:active {
    background-color: var(--neutral-bg-secondary);
}

.item-icon {
    color: var(--neutral-foreground-3);
    flex-shrink: 0;
}

.profile-dropdown-item:hover .item-icon {
    color: var(--neutral-foreground-2);
}

/* Utility Classes */
.text-muted {
    color: var(--neutral-foreground-3) !important;
}

.text-center {
    text-align: center;
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

/* Responsive Utilities */
@media (max-width: 768px) {
    .main-container {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .fluent-card-body {
        padding: var(--spacing-lg);
    }
}