/* ─
   recursion-learning.css
   Styles for the Recursion Learning page.
   Reuses the recursion component system
   and adds recursion-specific overrides.
   ─ */

:root {
    --recursion-primary: #5B9CF8;
    --recursion-secondary: #A8D0FF;
    --recursion-gradient: linear-gradient(135deg, #5B9CF8 0%, #A8D0FF 100%);
    --recursion-bg: rgba(91, 156, 248, 0.06);
    --recursion-bg-hover: rgba(91, 156, 248, 0.12);
}

/*  Hero Theme — Blue  */
.hero .title-line {
    color: var(--recursion-primary);
}

.hero .main-title {
    background: var(--recursion-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero .subtitle {
    color: #cbd5e1;
}

/* Typing text */
.typing-text_recursion {
    color: var(--recursion-primary);
    font-weight: 600;
}

/* Cursor */
.typing-cursor {
    color: var(--recursion-primary);
    animation: blink 1s infinite;
}

@keyframes blink {
    50% {
        opacity: 0;
    }
}

/* Stat boxes */
.stat-box {
    border: 1px solid rgba(91, 156, 248, 0.3);
    background: var(--recursion-bg);
}

.stat-box:hover {
    border-color: var(--recursion-primary);
    box-shadow: 0 0 20px rgba(91, 156, 248, 0.2);
}

/* Buttons */
.btn-primary {
    background: var(--recursion-gradient);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(91, 156, 248, 0.3);
}

.btn-secondary {
    border: 1px solid var(--recursion-primary);
    color: var(--recursion-secondary);
}

.btn-secondary:hover {
    background: var(--recursion-bg);
}

/*  Layout  */
.recursion-layout {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

/*  Sidebar  */
.recursion-sidebar {
    position: sticky;
    top: 100px;
    width: 240px;
    flex-shrink: 0;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.25rem 0;
    backdrop-filter: blur(10px);
}

.recursion-sidebar-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    padding: 0 1.25rem 0.75rem;
    border-bottom: 1px solid var(--glass-border);
    margin-bottom: 0.5rem;
}

.recursion-sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.recursion-sidebar-nav li a {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.55rem 1.25rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
}

.recursion-sidebar-nav li a:hover,
.recursion-sidebar-nav li a.active {
    color: var(--recursion-primary);
    background: var(--recursion-bg);
    border-left-color: var(--recursion-primary);
}

.recursion-sidebar-nav li a .nav-icon {
    width: 20px;
    text-align: center;
    font-size: 0.9rem;
}

/*  Main Content  */
.recursion-main-content {
    flex: 1;
    min-width: 0;
}

/*  Lesson Cards  */
.recursion-lesson {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2.5rem;
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
    transition: border-color 0.3s ease;
}

.recursion-lesson:target {
    border-color: var(--recursion-primary);
    box-shadow: 0 0 0 2px rgba(91, 156, 248, 0.15);
}

.recursion-lesson-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.recursion-lesson-number {
    font-family: Orbitron, sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--recursion-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex-shrink: 0;
}

.recursion-lesson-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

.recursion-lesson p,
.recursion-lesson li {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.75;
    margin-bottom: 0.75rem;
}

.recursion-lesson ul,
.recursion-lesson ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

.recursion-lesson li {
    margin-bottom: 0.4rem;
}

.recursion-lesson strong {
    color: var(--text-primary);
}

/*  Concept Cards  */
.recursion-concept-card {
    background: var(--dark-surface);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    margin: 1rem 0;
}

.recursion-concept-card h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--recursion-primary);
    margin: 0 0 0.5rem;
}

.recursion-concept-card p {
    margin-bottom: 0;
}

/* Pros/cons side-by-side */
.rec-pros-cons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1rem 0;
}

.rec-pros {
    border-color: rgba(34, 197, 94, 0.3);
    background: rgba(34, 197, 94, 0.04);
}

.rec-pros h4 {
    color: #22c55e;
}

.rec-cons {
    border-color: rgba(239, 68, 68, 0.3);
    background: rgba(239, 68, 68, 0.04);
}

.rec-cons h4 {
    color: #f87171;
}

/*  Code Blocks  */
.recursion-code-block {
    position: relative;
    margin: 1rem 0 1.5rem;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
}

.recursion-code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.3);
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.recursion-code-lang {
    font-family: "Fira Code", monospace;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--recursion-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.recursion-code-copy {
    background: none;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 0.25rem 0.6rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: Poppins, sans-serif;
    transition: all 0.2s ease;
}

.recursion-code-copy:hover {
    color: var(--text-primary);
    border-color: var(--recursion-secondary);
}

.recursion-code-copy.copied {
    color: #22c55e;
    border-color: #22c55e;
}

.recursion-code-block pre {
    margin: 0;
    padding: 1.25rem 1.5rem;
    background: #0d1117;
    overflow-x: auto;
}

.recursion-code-block code {
    font-family: "Fira Code", Consolas, Monaco, monospace;
    font-size: 0.85rem;
    line-height: 1.7;
    color: #e6edf3;
}

/* Token colours */
.recursion-code-block .tok-kw {
    color: #c792ea;
    font-weight: bold;
}

.recursion-code-block .tok-fn {
    color: #82aaff;
}

.recursion-code-block .tok-str {
    color: #c3e88d;
}

.recursion-code-block .tok-num {
    color: #f78c6c;
}

.recursion-code-block .tok-cmt {
    color: #546e7a;
    font-style: italic;
}

.recursion-code-block .tok-op {
    color: #89ddff;
}

.recursion-code-block .tok-bi {
    color: #ffcb6b;
}

.recursion-code-block .tok-var {
    color: #f07178;
}

.recursion-code-block .tok-bool {
    color: #ff5370;
}

.recursion-code-block .tok-param {
    color: #e6edf3;
}

/*  Callouts  */
.recursion-callout {
    display: flex;
    gap: 0.75rem;
    align-items: flex-start;
    background: var(--recursion-bg);
    border: 1px solid rgba(91, 156, 248, 0.25);
    border-radius: 12px;
    padding: 1.25rem 1.5rem;
    margin: 1.25rem 0;
}

.recursion-callout-icon {
    font-size: 1.3rem;
    flex-shrink: 0;
    line-height: 1.4;
}

.recursion-callout p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.6;
}

/*  Output Block  */
.recursion-output {
    background: rgba(6, 182, 212, 0.06);
    border: 1px solid rgba(6, 182, 212, 0.25);
    border-radius: 10px;
    padding: 1rem 1.25rem;
    margin: 0.75rem 0 1.25rem;
}

.recursion-output-label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: #22d3ee;
    margin-bottom: 0.4rem;
}

.recursion-output pre {
    margin: 0;
    font-family: "Fira Code", monospace;
    font-size: 0.82rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/*  Progress Bar  */
.recursion-progress-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 2rem 0;
    padding: 1.25rem 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
}

.recursion-progress-track {
    flex: 1;
    height: 8px;
    background: var(--dark-surface);
    border-radius: 99px;
    overflow: hidden;
}

.recursion-progress-fill {
    height: 100%;
    width: 0%;
    background: var(--recursion-gradient);
    border-radius: 99px;
    transition: width 0.5s ease;
}

.recursion-progress-text {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

/*  Exercise Box  */
.recursion-exercise {
    background: rgba(34, 197, 94, 0.06);
    border: 1px solid rgba(34, 197, 94, 0.25);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
}

.recursion-exercise-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    color: #22c55e;
    margin-bottom: 0.75rem;
}

.recursion-exercise-title i {
    font-size: 1.1rem;
}

.recursion-exercise ol,
.recursion-exercise ul {
    margin-bottom: 0.75rem;
}

.recursion-exercise-toggle {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #22c55e;
    font-family: Poppins, sans-serif;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0.4rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.recursion-exercise-toggle:hover {
    background: rgba(34, 197, 94, 0.25);
}

.recursion-exercise-solution {
    display: none;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(34, 197, 94, 0.2);
}

.recursion-exercise-solution.visible {
    display: block;
}

.recursion-exercise-solution p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

/*  Table  */
.recursion-table-wrap {
    overflow-x: auto;
    margin: 1.25rem 0 1.75rem;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
}

.recursion-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.recursion-table th {
    background: rgba(91, 156, 248, 0.12);
    color: var(--recursion-primary);
    font-weight: 600;
    text-align: left;
    padding: 0.75rem 1rem;
    white-space: nowrap;
}

.recursion-table td {
    padding: 0.65rem 1rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary);
}

.recursion-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

/*  SVG Diagrams  */
.recursion-svg-container {
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--dark-surface);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 2rem;
    margin: 1.5rem 0;
    overflow-x: auto;
}

.recursion-svg-diagram {
    max-width: 100%;
    height: auto;
    display: block;
}

/*  Responsive  */
@media (max-width: 1024px) {
    .recursion-sidebar {
        display: none;
    }
}

@media (max-width: 768px) {
    .recursion-lesson {
        padding: 1.5rem;
    }

    .recursion-lesson-header h3 {
        font-size: 1.15rem;
    }

    .recursion-code-block pre {
        padding: 1rem;
    }

    .recursion-code-block code {
        font-size: 0.78rem;
    }

    .recursion-progress-bar {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

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

    .recursion-callout {
        flex-direction: column;
        gap: 0.5rem;
    }

    .rec-pros-cons {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .recursion-lesson {
        padding: 1.25rem;
        border-radius: 12px;
    }

    .recursion-lesson-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .recursion-exercise {
        padding: 1rem;
    }
}

/*  Accessibility: focus-visible  */
.recursion-sidebar-nav li a:focus-visible,
.recursion-code-copy:focus-visible,
.recursion-exercise-toggle:focus-visible {
    outline: 2px solid var(--recursion-primary);
    outline-offset: 2px;
}

/*  Print  */
@media print {

    .recursion-sidebar,
    .recursion-progress-bar,
    .recursion-exercise-toggle,
    .recursion-code-copy,
    .navbar,
    .footer {
        display: none !important;
    }

    .recursion-lesson {
        break-inside: avoid;
        border: 1px solid #ccc;
    }

    .recursion-code-block pre {
        background: #f5f5f5;
        color: #333;
    }
}