/* Core CSS Variables and Base Styles */
:root {
    /* Color Scheme - Will be overridden by theme configuration */
    --primary-color: #5f0fd3;
    --secondary-color: #8f14df;
    --accent-color: #ff6b6b;
    --background-color: #1a1a1a;
    --surface-color: #222;
    --text-color: #fff;
    --text-muted: rgba(255, 255, 255, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --error-color: #e74c3c;
    --success-color: #2ecc71;
    --warning-color: #f39c12;

    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--background-color), var(--surface-color));
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

/* Layout Components */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Navigation Styles - Mobile First */
.main-navigation {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    height: 60px;
    position: relative;
}

/* Navigation controls container */
.nav-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    z-index: 1;
}

.nav-brand h1 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-brand img {
    height: 32px;
    width: auto;
}

.nav-brand a {
    text-decoration: none;
    color: inherit;
}

/* Mobile Navigation Toggle - Better hamburger design */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 21px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    position: relative;
}

.nav-toggle span {
    display: block;
    height: 3px;
    width: 100%;
    background: var(--text-color);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: scale(0);
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* Mobile Navigation Menu - Solid background */
.nav-menu {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--surface-color);
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    display: flex;
    flex-direction: column;
    z-index: 999;
    border-top: 1px solid var(--border-color);
}

.nav-menu.active {
    transform: translateX(0);
}

/* Mobile menu backdrop */
.nav-menu-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    z-index: 998;
}

.nav-menu-backdrop.active {
    opacity: 1;
    visibility: visible;
}    .nav-items {
        flex: 1;
        padding: var(--spacing-lg);
        display: flex;
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    /* Return to App section for secondary pages */
    .nav-return-to-app {
        padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
        border-bottom: 1px solid var(--border-color);
        margin-bottom: var(--spacing-md);
    }

    .nav-app-link {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-md) var(--spacing-lg);
        color: var(--primary-color);
        text-decoration: none;
        border-radius: var(--radius-lg);
        transition: var(--transition-fast);
        font-weight: 600;
        min-height: 48px;
        background: rgba(95, 15, 211, 0.1);
        border: 1px solid rgba(95, 15, 211, 0.3);
    }

    .nav-app-link:hover {
        background: rgba(95, 15, 211, 0.2);
        border-color: var(--primary-color);
        transform: translateX(-2px);
    }

    .nav-app-link i {
        width: 20px;
        text-align: center;
        font-size: var(--font-size-base);
    }

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-muted);
    text-decoration: none;
    border-radius: var(--radius-lg);
    transition: var(--transition-fast);
    font-weight: 500;
    min-height: 48px; /* Touch-friendly */
    border: none;
    background: none;
    cursor: pointer;
    font-size: var(--font-size-base);
    width: 100%;
    justify-content: flex-start;
}

.nav-item:hover,
.nav-item.active {
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.05);
}

.nav-item i {
    width: 20px;
    text-align: center;
    font-size: var(--font-size-lg);
}    .nav-footer {
        padding: var(--spacing-lg);
        border-top: 1px solid var(--border-color);
    }

    /* User Profile Dropdown */
    .nav-user-profile {
        position: relative;
    }

    .nav-user-toggle {
        display: flex;
        align-items: center;
        padding: var(--spacing-xs);
        background: none;
        border: none;
        color: var(--text-color);
        cursor: pointer;
        border-radius: 50%;
        transition: var(--transition-fast);
        width: 40px;
        height: 40px;
        justify-content: center;
    }

    .nav-user-toggle:hover {
        background: rgba(255, 255, 255, 0.1);
        transform: scale(1.05);
    }

    .user-avatar {
        width: 32px;
        height: 32px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: var(--font-size-sm);
        font-weight: 600;
        color: white;
        flex-shrink: 0;
    }

    .nav-user-dropdown {
        position: absolute;
        top: 100%;
        right: 0;
        left: auto;
        min-width: 200px;
        background: var(--surface-color);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-lg);
        box-shadow: var(--shadow-lg);
        opacity: 0;
        visibility: hidden;
        transform: translateY(10px);
        transition: all var(--transition-fast);
        z-index: 1000;
        margin-bottom: var(--spacing-sm);
    }

    .nav-user-dropdown.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .user-dropdown-header {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border-color);
    }

    .user-details {
        flex: 1;
    }

    .user-dropdown-header .user-name {
        font-weight: 600;
        font-size: var(--font-size-base);
        color: var(--text-color);
    }

    .user-email {
        font-size: var(--font-size-sm);
        color: var(--text-muted);
    }

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

    .user-dropdown-items .nav-item {
        padding: var(--spacing-sm) var(--spacing-md);
        margin: 0;
        border-radius: var(--radius-md);
        min-height: auto;
    }

    .dropdown-divider {
        border: none;
        height: 1px;
        background: var(--border-color);
        margin: var(--spacing-sm) 0;
    }

.nav-logout,
.nav-login {
    justify-content: center;
    font-weight: 600;
}

.nav-login {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    min-height: 40px;
    white-space: nowrap;
}

.nav-login:hover {
    color: white;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

/* Desktop Navigation */
@media (min-width: 769px) {
    .main-navigation {
        position: static;
        background: var(--surface-color);
    }

    .nav-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: var(--spacing-md) var(--spacing-xl);
        height: auto;
        min-height: 64px;
    }

    .nav-controls {
        display: flex;
        align-items: center;
        gap: var(--spacing-lg);
    }

    .nav-toggle {
        display: none;
    }

    .nav-menu {
        position: static;
        transform: none;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        padding: 0;
        background: transparent;
        top: auto;
        bottom: auto;
        left: auto;
        right: auto;
        height: auto;
        border-top: none;
    }

    .nav-items {
        flex-direction: row;
        gap: var(--spacing-lg);
        padding: 0;
        flex: none;
    }

    .nav-item {
        min-height: auto;
        padding: var(--spacing-sm) var(--spacing-md);
        white-space: nowrap;
    }

    .nav-footer {
        display: none; /* Hide on desktop as login button is in nav-controls */
    }

    .nav-user-dropdown {
        position: absolute;
        top: 100%;
        right: 0;
        left: auto;
        bottom: auto;
        margin-top: var(--spacing-sm);
        margin-bottom: 0;
        min-width: 200px;
    }

    .nav-brand {
        display: block;
    }

    .nav-brand h1 {
        font-size: var(--font-size-xl);
    }

    /* Desktop layout: brand on left, nav items center, user controls on right */
    .nav-header {
        position: relative;
    }

    .nav-menu {
        position: absolute;
        left: 50%;
        transform: translateX(-50%);
        top: 50%;
        transform: translate(-50%, -50%);
    }

    .nav-controls {
        margin-left: auto;
        z-index: 1;
    }

    /* Desktop login button styling */
    .nav-controls .nav-login {
        min-height: 36px;
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--font-size-sm);
    }
}

/* Adjust main content for fixed nav on mobile */
.main-content {
    padding-top: 60px;
}

@media (min-width: 769px) {
    .main-content {
        padding-top: 0;
    }
    
    .main-navigation {
        position: static;
        border-bottom: 1px solid var(--border-color);
    }
}

/* Button Styles - Enhanced for accessibility */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
    min-height: 44px; /* Touch-friendly */
    white-space: nowrap;
}

.btn:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary-color);
}

.btn-logout {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
    background: transparent;
    color: var(--text-color);
    border: 1px solid var(--border-color);
    min-height: 44px;
    white-space: nowrap;
}

.btn-logout:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--error-color);
    color: var(--error-color);
}

.btn-logout:focus {
    outline: 2px solid var(--error-color);
    outline-offset: 2px;
}

.btn-login {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: white;
    min-height: 44px;
    white-space: nowrap;
}

.btn-login:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-login:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Card Component */
.card {
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-color);
}

.form-input {
    width: 100%;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--background-color);
    color: var(--text-color);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(95, 15, 211, 0.1);
}

/* Utility Classes */
.text-center {
    text-align: center;
}

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

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

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

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

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

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

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

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

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

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

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

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

.p-xs {
    padding: var(--spacing-xs);
}

.p-sm {
    padding: var(--spacing-sm);
}

.p-md {
    padding: var(--spacing-md);
}

.p-lg {
    padding: var(--spacing-lg);
}

.p-xl {
    padding: var(--spacing-xl);
}

/* Responsive Design */
@media (max-width: 768px) {
    .card {
        margin: var(--spacing-md);
        padding: var(--spacing-lg);
    }

    .form-input {
        padding: var(--spacing-md);
        font-size: 16px; /* Prevents zoom on iOS */
    }

    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
        min-height: 48px;
    }
}

/* Module-specific styles will be loaded dynamically */
.module-container {
    flex: 1;
    display: flex;
    flex-direction: column;
}

/* Loading and Error States */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    font-size: var(--font-size-base);
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-xl);
}

.loading i {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.error {
    padding: var(--spacing-lg);
    margin: var(--spacing-lg);
    background: rgba(231, 76, 60, 0.1);
    border: 1px solid var(--error-color);
    border-radius: var(--radius-md);
    color: var(--error-color);
    text-align: center;
}

/* Accessibility improvements */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus management */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* Skip links for accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--primary-color);
    color: white;
    padding: 8px;
    text-decoration: none;
    border-radius: var(--radius-sm);
    z-index: 9999;
}

.skip-link:focus {
    top: 6px;
}