:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --header-bg: #333333;
    --header-text: #ffffff;
    --link-color: #ffffff;
    --link-hover: #ffb366;
    --main-bg: #ffffff;
    --main-link-color: #ffffff;
    --main-link-hover: #ffb366;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --header-bg: #000000;
    --header-text: #ffffff;
    --link-color: #ffffff;
    --link-hover: #ffb366;
    --main-bg: #1a1a1a;
    --main-link-color: #ffffff;
    --main-link-hover: #ffb366;
}

body {
    margin: 0;
    font-family: Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

header {
    background: var(--header-bg);
    color: var(--header-text);
    padding: 0.5em 2em;
    transition: background-color 0.3s ease;
}

nav {
    display: flex;
    justify-content: center;
    gap: 2em;
}

nav a {
    color: var(--header-text);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

nav a:visited {
    color: var(--header-text);
}

nav a:hover {
    color: var(--link-hover);
}

/* Main content links */
main a {
    color: var(--main-link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

main a:visited {
    color: var(--main-link-color);
}

main a:hover {
    color: var(--main-link-hover);
}

/* Global link styling to override browser defaults */
a {
    color: var(--main-link-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:visited {
    color: var(--main-link-color);
}

a:hover {
    color: var(--main-link-hover);
}

main {
    padding: 2em;
    background-color: var(--main-bg);
    transition: background-color 0.3s ease;
}

/* Header theme toggle button */
.theme-toggle-header {
    background: transparent;
    color: var(--header-text);
    border: 1px solid var(--header-text);
    border-radius: 50%;
    width: 35px;
    height: 35px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle-header:hover {
    background: var(--header-text);
    color: var(--header-bg);
    transform: scale(1.1);
}

/* Theme toggle button */
.theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    background: var(--header-bg);
    color: var(--header-text);
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    opacity: 0.8;
    transform: scale(1.1);
}

/* Error notification styles */
.error-notification {
    position: fixed;
    top: -100px;
    left: 0;
    right: 0;
    background: #dc3545;
    color: white;
    padding: 1rem;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: top 0.3s ease;
}

.error-notification.show {
    top: 0;
}

.error-notification.hide {
    top: -100px;
}

.error-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.error-content i:first-child {
    font-size: 1.1rem;
}

.close-error {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0.25rem;
    margin-left: 1rem;
    border-radius: 3px;
    transition: background-color 0.2s ease;
}

.close-error:hover {
    background: rgba(255,255,255,0.2);
}

.close-error i {
    font-size: 0.9rem;
}

/* Success notification styles */
.success-notification {
    position: fixed;
    top: -100px;
    left: 0;
    right: 0;
    background: #28a745;
    color: white;
    padding: 1rem;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.2);
    transition: top 0.3s ease;
}

.success-notification.show {
    top: 0;
}

.success-notification.hide {
    top: -100px;
}

.success-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.success-content i:first-child {
    font-size: 1.1rem;
}

.close-success {
    background: transparent;
    border: none;
    color: white;
    cursor: pointer;
    padding: 0.25rem;
    margin-left: 1rem;
    border-radius: 3px;
    transition: background-color 0.2s ease;
}

.close-success:hover {
    background: rgba(255,255,255,0.2);
}

.close-success i {
    font-size: 0.9rem;
}

/* Login Prompt Styles for Unauthenticated Users - Azure App Service Optimized */
.login-prompt {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
    text-align: center;
    padding: 2rem;
}

.login-prompt h1 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 2.5rem;
}

.login-prompt p {
    color: var(--text-color);
    margin-bottom: 2rem;
    font-size: 1.2rem;
    max-width: 600px;
}

.login-link {
    display: inline-block;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.login-link:hover {
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    color: white;
}

.login-icon {
    margin-right: 0.5rem;
}

/* Responsive design for Azure App Service mobile optimization */
@media (max-width: 768px) {
    .login-prompt {
        padding: 1rem;
        min-height: 50vh;
    }
    
    .login-prompt h1 {
        font-size: 2rem;
    }
    
    .login-prompt p {
        font-size: 1rem;
    }
    
    .login-link {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
}

/* Dark theme support for login prompt */
[data-theme="dark"] .login-prompt h1,
[data-theme="dark"] .login-prompt p {
    color: var(--text-color);
}

/* High contrast mode support for Azure accessibility compliance */
@media (prefers-contrast: high) {
    .login-link {
        background: #000;
        border: 2px solid #fff;
    }
    
    .login-link:hover {
        background: #333;
        border-color: #fff;
    }
}

/* Azure CDN optimization - preload hint for critical CSS */
.login-prompt {
    contain: layout style;
}