/* Main Styles */
:root {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --card-bg: #1e1e1e;
    --card-hover: #2d2d2d;
    --border-color: #333;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --code-bg: #2d2d2d;
    --navbar-height: 60px;
}

/* Base Styles */
html[data-bs-theme="dark"] {
    color-scheme: dark;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding-top: 4rem;
    transition: all 0.3s ease;
}

/* Navbar Styles */
.navbar {
    padding: 0.75rem 1rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    position: sticky;
    top: 0;
    z-index: 1030; /* Above most content but below modals (1050) */
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.25rem;
}

.navbar-toggler {
    border: none;
    padding: 0.5rem;
}

.navbar-toggler:focus {
    box-shadow: none;
    outline: none;
}

/* Guide Page Specific */
.guide-section {
    margin-bottom: 3rem;
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

/* Code Blocks */
pre {
    background: var(--code-bg);
    padding: 1rem;
    border-radius: 0.25rem;
    border: 1px solid var(--border-color);
    overflow-x: auto;
}

code {
    background-color: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.9em;
}

/* Table of Contents */
.toc {
    position: sticky;
    top: calc(var(--navbar-height) + 1rem); /* Position below navbar */
    max-height: calc(100vh - var(--navbar-height) - 2rem);
    overflow-y: auto;
    z-index: 1020; /* Below navbar but above content */
    padding: 1rem;
    background: var(--card-bg);
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.toc h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.toc ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.toc li {
    margin: 0.25rem 0;
}

.toc a {
    display: block;
    padding: 0.4rem 0.8rem;
    color: var(--text-color);
    text-decoration: none;
    border-radius: 0.25rem;
    transition: all 0.2s ease;
}

.toc a:hover {
    background: var(--card-hover);
    color: var(--primary-color);
}

/* Utility Classes */
.bg-dark {
    background-color: var(--bg-color) !important;
}

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

.border-dark {
    border-color: var(--border-color) !important;
}

/* Responsive Adjustments */
@media (max-width: 991.98px) {
    .toc {
        position: static;
        max-height: none;
        margin-bottom: 2rem;
    }
}

/* Ensure proper spacing for fixed navbar and TOC */
body {
    padding-top: calc(var(--navbar-height) + 1rem);
    padding-bottom: 2rem;
}

/* Add scroll margin to account for fixed navbar when navigating to anchors */
:target {
    scroll-margin-top: calc(var(--navbar-height) + 1rem);
}

/* Ensure content doesn't shift when TOC becomes sticky */
main {
    position: relative;
}

/* Fix for dropdown menus in dark theme */
.dropdown-menu {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
}

.dropdown-item {
    color: var(--text-color);
}

.dropdown-item:hover {
    background-color: var(--card-hover);
    color: var(--primary-color);
}

.dropdown-divider {
    border-color: var(--border-color);
}

/* Guide Sections */
.guide-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 0.5rem;
    border-left: 4px solid var(--primary-color);
    box-shadow: 0 2px 10px var(--shadow-color);
}

.difficulty-badge {
    font-size: 0.8em;
    padding: 0.3em 0.6em;
    margin-right: 0.5em;
}

/* Table of Contents */
.toc {
    position: sticky;
    top: 80px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
    background: var(--card-bg);
    padding: 1rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
}

.toc a {
    color: var(--text-color);
    text-decoration: none;
    display: block;
    padding: 0.4rem 0.8rem;
    margin: 0.2rem 0;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.toc a:hover, .toc a:focus {
    color: var(--primary-color);
    background-color: var(--card-hover);
    padding-left: 1rem;
}

.toc ul {
    list-style: none;
    padding-left: 1rem;
    margin: 0;
}

.toc > ul {
    padding-left: 0;
}

/* Code Blocks */
pre {
    background: var(--code-bg);
    color: #d4d4d4;
    padding: 1rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    border: 1px solid var(--border-color);
}

code {
    font-family: 'Fira Code', 'Courier New', Courier, monospace;
    background: var(--code-bg);
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
    color: #f8f9fa;
}

pre code {
    padding: 0;
    background: transparent;
    font-size: 1em;
}

/* Check List */
.checklist {
    list-style: none;
    padding-left: 0;
}

.checklist li:before {
    content: "\2713 ";
    color: #198754;
    font-weight: bold;
    margin-right: 0.5rem;
}

/* Card Styles */
.card {
    transition: all 0.3s ease;
    height: 100%;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-color);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow-color);
    background-color: var(--card-hover);
}

.card-img-top {
    height: 180px;
    object-fit: cover;
    background: var(--bg-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--primary-color);
}

.card-body {
    background-color: transparent;
}

.card-title, .card-text {
    color: var(--text-color);
}

/* Jumbotron */
.jumbotron {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2d7d32 100%);
    color: white;
    padding: 4rem 2rem;
    margin: 1rem 0 3rem 0;
    border-radius: 0.5rem;
    box-shadow: 0 4px 15px var(--shadow-color);
}

/* Boxes */
.warning-box {
    background: #332a00;
    border-left: 4px solid #ffc107;
    padding: 1rem;
    margin: 1rem 0;
    color: #ffecb3;
    border-radius: 0 4px 4px 0;
}

.tip-box {
    background: #001f29;
    border-left: 4px solid #0dcaf0;
    padding: 1rem;
    margin: 1rem 0;
    color: #b3ecff;
    border-radius: 0 4px 4px 0;
}

/* Navigation */
.navbar {
    background-color: var(--card-bg) !important;
    box-shadow: 0 2px 10px var(--shadow-color);
    height: var(--navbar-height);
    padding: 0.5rem 1rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
}

.navbar-brand {
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.navbar-nav .nav-link {
    color: var(--text-color) !important;
    padding: 0.5rem 1rem;
    transition: color 0.3s ease;
}

.navbar-nav .nav-link:hover {
    color: var(--primary-color) !important;
}

/* Sections */
section {
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
}

section:last-child {
    border-bottom: none;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

h1 {
    font-size: 2.5rem;
    margin-top: 1.5rem;
}

h2 {
    font-size: 2rem;
    margin-top: 2.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

h3 {
    font-size: 1.75rem;
    margin-top: 2rem;
}

h4 {
    font-size: 1.5rem;
    margin-top: 1.5rem;
}

/* Cards */
.card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.card-header {
    background-color: #f8f9fa;
    border-bottom: 1px solid rgba(0,0,0,.125);
    font-weight: 600;
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border: none;
    padding: 0.5rem 1.5rem;
    border-radius: 4px;
    transition: all 0.3s ease;
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--shadow-color);
}

/* Forms */
.form-control {
    border-radius: 4px;
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(76, 175, 80, 0.25);
    background-color: var(--card-hover);
    color: var(--text-color);
}

/* Results */
#caesar-result,
#vigenere-result,
#aes-result,
#rsa-public,
#rsa-encrypted,
#rsa-decrypted {
    font-family: 'Courier New', Courier, monospace;
    word-break: break-all;
    background-color: #f8f9fa;
    padding: 0.5rem;
    border-radius: 4px;
    margin-top: 0.5rem;
    display: inline-block;
    width: 100%;
}

/* Challenge Cards */
.list-group-item {
    margin-bottom: 0.5rem;
    border-radius: 4px !important;
    border: 1px solid rgba(0,0,0,.125);
    transition: all 0.3s ease;
}

.list-group-item:hover {
    background-color: #f8f9fa;
    transform: translateX(5px);
}

.badge {
    font-weight: 500;
    padding: 0.35em 0.65em;
}

/* Footer */
footer {
    margin-top: 3rem;
    padding: 2rem 0;
    background-color: #343a40;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    section {
        padding: 1.5rem 0;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.75rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

section {
    animation: fadeIn 0.5s ease-out forwards;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

#challenges {
    background-color: var(--card-bg);
}

.bg-dark-footer {
    background-color: #212529 !important;
}
.text-white-footer {
    color: #ffffff !important;
}