:root {
    /* Color Palette */
    --lavender: #E6E6FA;
    --lavender-medium: #9370DB;
    --black: #000000;
    --dark-grey: #121212;
    --medium-grey: #2C2C2C;
    --light-grey: #808080;
    --text-color: #E6E6FA;
    --accent: #D8BFD8; /* Thistle */

    /* Typography */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-mono: 'Courier New', Courier, monospace;
}

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

body, html {
    height: 100%;
    width: 100%;
    overflow: hidden; /* No scrolling */
    background-color: var(--black);
    color: var(--text-color);
    font-family: var(--font-family);
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 20px;
}

header {
    flex: 0 0 auto;
    border-bottom: 2px solid var(--lavender);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.5rem;
    color: var(--lavender);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.nav-link {
    background-color: var(--lavender-medium);
    color: var(--black);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 8px 18px;
    border-radius: 25px; /* Pill shape */
    transition: all 0.2s ease-in-out;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.nav-link:hover {
    background-color: var(--lavender);
    color: var(--black);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

main {
    flex: 1 1 auto;
    display: flex;
    flex-direction: column;
    overflow-y: auto; /* Allow the main content area to scroll */
    padding-right: 10px;
}

.dashboard-sections {
    display: flex;
    flex-direction: column;
    gap: 40px;
    padding-bottom: 40px;
}

.section-title {
    display: inline-block;
    padding: 8px 18px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 20px;
    border-radius: 25px; /* Pill shape */
    color: var(--black);
    font-weight: bold;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
    cursor: default; /* No pointer to indicate it's not clickable */
}

/* Section-specific hues (variations of purple/lavender) */
.section-problem-solving .section-title { background-color: #b39ddb; } /* Deep Purple 100 */
.section-professional .section-title { background-color: #9575cd; }    /* Deep Purple 300 */
.section-technical .section-title { background-color: #7986cb; }       /* Indigo 300 */
.section-cyber-threat .section-title { background-color: #ba68c8; }    /* Muted Purple (Deep Purple 300 equivalent) */
.section-challenges .section-title { background-color: #9575cd; }      /* Muted Indigo (Deep Purple 300) */

/* Adjust card borders slightly to match section theme if desired, 
   but for now we'll stick to the title background as requested. */

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

/* Scrollbar styling for main */
main::-webkit-scrollbar {
    width: 8px;
}
main::-webkit-scrollbar-track {
    background: var(--dark-grey);
}
main::-webkit-scrollbar-thumb {
    background: var(--lavender-medium);
    border-radius: 4px;
}

.card {
    background: var(--dark-grey);
    border: 1px solid var(--medium-grey);
    padding: 15px;
    border-radius: 8px;
    transition: transform 0.2s, border-color 0.2s;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--lavender);
}

.card h3 {
    margin-bottom: 10px;
    color: var(--lavender);
}

.card p {
    font-size: 0.9rem;
    color: var(--light-grey);
}

.card .badge {
    align-self: flex-start;
    font-size: 0.7rem;
    padding: 3px 8px;
    border-radius: 4px;
    background: var(--medium-grey);
    margin-top: 10px;
    text-transform: uppercase;
    font-weight: bold; /* Make text bold */
}

/* Muted, pastel-like colors for better readability with black text */
.card .badge.basic { background: #a5d6a7; color: var(--black); }        /* Muted Green */
.card .badge.intermediate { background: #ffcc80; color: var(--black); } /* Muted Orange */
.card .badge.advanced { background: #ef9a9a; color: var(--black); }     /* Muted Red */

footer {
    flex: 0 0 auto;
    text-align: center;
    padding-top: 10px;
    font-size: 0.8rem;
    color: var(--light-grey);
    border-top: 1px solid var(--medium-grey);
}

.card.completed {
    border-color: #2e7d32; /* Green border */
    position: relative;
}

.card.completed::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(135deg, transparent 90%, rgba(46, 125, 50, 0.2) 90%);
    pointer-events: none;
    border-radius: 8px;
}

.completion-check {
    position: absolute;
    bottom: 10px;
    right: 15px;
    color: #4caf50;
    font-size: 1.2rem;
    font-weight: bold;
    text-shadow: 0 0 10px rgba(76, 175, 80, 0.5);
}

/* Slideshow styling for lessons */
.slide-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 20px;
}

.slide {
    max-width: 800px;
    width: 100%;
    animation: fadeIn 0.3s ease-in-out;
}

.slide h2 {
    color: var(--lavender);
    margin-bottom: 20px;
    font-size: 2rem;
}

.slide p {
    font-size: 1.2rem;
    line-height: 1.6;
    margin-bottom: 20px;
    color: var(--lavender);
}

.slide ul {
    list-style: none;
    text-align: left;
    display: inline-block;
    margin: 20px 0;
}

.slide li {
    padding: 8px 0;
    font-size: 1.1rem;
}

.slide li::before {
    content: '▶';
    color: var(--lavender-medium);
    margin-right: 10px;
}

.navigation-controls {
    margin-top: 30px;
    display: flex;
    gap: 20px;
}

.btn {
    padding: 10px 25px;
    background: var(--lavender-medium);
    color: var(--black);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    transition: background 0.2s;
}

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

.btn:disabled {
    background: var(--medium-grey);
    cursor: not-allowed;
}

/* Quiz styling */
.quiz-container {
    margin-top: 20px;
    width: 100%;
    max-width: 600px;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 20px;
}

.option-btn {
    padding: 15px;
    background: var(--dark-grey);
    border: 1px solid var(--lavender-medium);
    color: var(--lavender);
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
    text-align: left;
}

.option-btn:hover {
    background: var(--medium-grey);
}

.option-btn.correct {
    background: #2e7d32; /* Material Green */
    border-color: #2e7d32;
    color: white;
}

.option-btn.incorrect {
    background: #c62828; /* Material Red */
    border-color: #c62828;
    color: white;
}

.quiz-results h3 {
    margin-bottom: 20px;
}

.ksa-tag, .ref-tag {
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 15px;
    display: inline-block;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ksa-tag {
    color: var(--lavender-medium);
    background: rgba(147, 112, 219, 0.1);
    border: 1px solid rgba(147, 112, 219, 0.3);
}

.ref-tag {
    color: var(--accent);
    background: rgba(216, 191, 216, 0.1);
    border: 1px solid rgba(216, 191, 216, 0.3);
}

.lesson-metadata {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.hidden { display: none !important; }