/* ============================================
   Scoodol Learn Python – Stylesheet
   Minimalistisch & Bunt
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---- CSS Variables ---- */
:root {
    --bg-primary: #0a0a1a;
    --bg-secondary: #111128;
    --bg-card: #16163a;
    --bg-card-hover: #1e1e4a;
    --bg-editor: #0d0d22;
    --bg-output: #0a0a18;

    --text-primary: #e8e8f0;
    --text-secondary: #9090b0;
    --text-muted: #606080;

    --accent-purple: #a855f7;
    --accent-purple-glow: rgba(168, 85, 247, 0.3);
    --accent-cyan: #06b6d4;
    --accent-cyan-glow: rgba(6, 182, 212, 0.2);
    --accent-pink: #ec4899;
    --accent-pink-glow: rgba(236, 72, 153, 0.2);
    --accent-green: #22c55e;
    --accent-green-glow: rgba(34, 197, 94, 0.3);
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --accent-red-glow: rgba(239, 68, 68, 0.2);

    --border-color: rgba(255, 255, 255, 0.06);
    --border-glow: rgba(168, 85, 247, 0.2);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px var(--accent-purple-glow);

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

/* ---- Reset ---- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
}

/* ---- Background Animation ---- */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse 600px 600px at 20% 20%, var(--accent-purple-glow), transparent),
        radial-gradient(ellipse 500px 500px at 80% 80%, var(--accent-cyan-glow), transparent),
        radial-gradient(ellipse 400px 400px at 50% 50%, var(--accent-pink-glow), transparent);
    pointer-events: none;
    z-index: 0;
    animation: bgShift 20s ease-in-out infinite alternate;
}

@keyframes bgShift {
    0% { opacity: 0.4; }
    50% { opacity: 0.7; }
    100% { opacity: 0.4; }
}

/* ---- Progress Bar ---- */
.progress-bar-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--bg-secondary);
    z-index: 1000;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan), var(--accent-pink));
    background-size: 200% 100%;
    animation: gradientMove 3s ease infinite;
    transition: width var(--transition-slow);
    border-radius: 0 2px 2px 0;
}

@keyframes gradientMove {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ---- Main Layout ---- */
.app-container {
    position: relative;
    z-index: 1;
    min-height: 100vh;
}

/* ---- Section: Common ---- */
.section {
    display: none;
    min-height: 100vh;
    padding: 2rem;
}

.section.active {
    display: flex;
    animation: fadeIn 0.5s ease;
}

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

/* ---- Landing Page ---- */
.landing-section {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    text-align: center;
}

.landing-logo {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-purple);
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-bottom: -1rem;
}

.landing-title {
    font-size: clamp(2.5rem, 6vw, 5rem);
    font-weight: 900;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan), var(--accent-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
    0% { filter: brightness(1); }
    100% { filter: brightness(1.2); }
}

.landing-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 500px;
}

.landing-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin-top: 1rem;
}

.input-wrapper {
    position: relative;
    width: 100%;
    max-width: 400px;
}

.input-wrapper input {
    width: 100%;
    padding: 1rem 1.5rem;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 1.1rem;
    outline: none;
    transition: all var(--transition-normal);
}

.input-wrapper input:focus {
    border-color: var(--accent-purple);
    box-shadow: 0 0 20px var(--accent-purple-glow);
}

.input-wrapper input::placeholder {
    color: var(--text-muted);
}

.input-wrapper .input-icon {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 1.2rem;
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.9rem 2rem;
    border: none;
    border-radius: var(--radius-md);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.btn:hover::after {
    opacity: 1;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-purple), #7c3aed);
    color: white;
    box-shadow: 0 4px 15px var(--accent-purple-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--accent-purple-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-success {
    background: linear-gradient(135deg, var(--accent-green), #16a34a);
    color: white;
    box-shadow: 0 4px 15px var(--accent-green-glow);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px var(--accent-green-glow);
}

.btn-danger {
    background: linear-gradient(135deg, var(--accent-red), #dc2626);
    color: white;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.btn-outline:hover {
    border-color: var(--accent-purple);
    background: rgba(168, 85, 247, 0.1);
}

.btn-lg {
    padding: 1.1rem 3rem;
    font-size: 1.1rem;
    border-radius: var(--radius-lg);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* ---- Experience Selection ---- */
.experience-section {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    text-align: center;
}

.experience-greeting {
    font-size: 2rem;
    font-weight: 700;
}

.experience-greeting .username-highlight {
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.experience-question {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.experience-options {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 1rem;
    max-width: 900px;
}

.experience-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    width: 260px;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: left;
}

.experience-card:hover {
    border-color: var(--accent-purple);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.experience-card .card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.experience-card .card-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.experience-card .card-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ---- Learn Section (Main UI) ---- */
.learn-section {
    flex-direction: column;
    padding: 0;
}

.learn-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.learn-header-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.learn-header .brand {
    font-size: 1rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.8rem;
    background: rgba(168, 85, 247, 0.15);
    border: 1px solid rgba(168, 85, 247, 0.3);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-purple);
}

.learn-header-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: var(--bg-card);
    border-radius: 100px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.user-badge .user-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: white;
    font-weight: 700;
}

/* ---- Learn Content ---- */
.learn-content {
    display: flex;
    flex: 1;
    overflow: hidden;
    height: calc(100vh - 60px);
}

/* Left Panel: Task + Editor */
.left-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--border-color);
    min-width: 0;
}

/* Task Description */
.task-panel {
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    max-height: 45%;
    overflow-y: auto;
}

.task-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.task-step {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.task-description {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
}

.task-description code {
    background: rgba(168, 85, 247, 0.15);
    color: var(--accent-purple);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
}

.task-description .code-example {
    background: var(--bg-editor);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin: 0.8rem 0;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--accent-cyan);
    white-space: pre;
}

.task-hint {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-sm);
    padding: 0.8rem 1rem;
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--accent-orange);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

/* Code Editor */
.editor-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 1rem;
    background: var(--bg-editor);
    border-bottom: 1px solid var(--border-color);
}

.editor-toolbar .file-tab {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.3rem 0.8rem;
    background: rgba(168, 85, 247, 0.1);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-secondary);
}

.editor-toolbar .file-tab .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-green);
}

.editor-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-run {
    padding: 0.4rem 1.2rem;
    font-size: 0.85rem;
    background: linear-gradient(135deg, var(--accent-green), #16a34a);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.btn-run:hover {
    box-shadow: 0 0 15px var(--accent-green-glow);
}

.btn-check {
    padding: 0.4rem 1.2rem;
    font-size: 0.85rem;
    background: linear-gradient(135deg, var(--accent-purple), #7c3aed);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.btn-check:hover {
    box-shadow: 0 0 15px var(--accent-purple-glow);
}

.code-editor {
    flex: 1;
    position: relative;
    min-height: 150px;
}

.code-editor textarea {
    width: 100%;
    height: 100%;
    padding: 1rem;
    background: var(--bg-editor);
    color: var(--text-primary);
    border: none;
    outline: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.7;
    resize: none;
    tab-size: 4;
}

.code-editor textarea::placeholder {
    color: var(--text-muted);
}

.line-numbers {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 100%;
    padding: 1rem 0;
    background: rgba(0, 0, 0, 0.2);
    text-align: right;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-muted);
    user-select: none;
    pointer-events: none;
    overflow: hidden;
}

.code-editor textarea {
    padding-left: 52px;
}

/* Output Panel */
.output-panel {
    border-top: 1px solid var(--border-color);
    max-height: 200px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.4rem 1rem;
    background: var(--bg-output);
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.output-content {
    padding: 0.8rem 1rem;
    background: var(--bg-output);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    overflow-y: auto;
    flex: 1;
    white-space: pre-wrap;
    color: var(--accent-green);
}

.output-content.error {
    color: var(--accent-red);
}

/* Right Panel: Documentation */
.right-panel {
    width: 350px;
    min-width: 300px;
    display: flex;
    flex-direction: column;
    background: var(--bg-secondary);
    overflow: hidden;
}

.doc-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.doc-header h3 {
    font-size: 1rem;
    font-weight: 700;
}

.doc-header .doc-icon {
    font-size: 1.2rem;
}

.doc-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.doc-empty {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.doc-entry {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 1rem;
    margin-bottom: 0.8rem;
    transition: all var(--transition-fast);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

.doc-entry:hover {
    border-color: var(--accent-purple);
}

.doc-entry .doc-cmd {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-cyan);
    margin-bottom: 0.4rem;
}

.doc-entry .doc-desc {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.doc-entry .doc-example {
    background: var(--bg-editor);
    border-radius: 4px;
    padding: 0.5rem;
    margin-top: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent-purple);
    white-space: pre;
}

/* ---- Success Overlay ---- */
.success-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 999;
    animation: fadeIn 0.3s ease;
}

.success-overlay.visible {
    display: flex;
}

.success-content {
    text-align: center;
    animation: successPop 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes successPop {
    0% { transform: scale(0.5); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.success-check {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-green), #16a34a);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 3.5rem;
    color: white;
    box-shadow: 0 0 60px var(--accent-green-glow);
    animation: checkPulse 1.5s ease-in-out infinite;
}

@keyframes checkPulse {
    0%, 100% { box-shadow: 0 0 30px var(--accent-green-glow); }
    50% { box-shadow: 0 0 60px var(--accent-green-glow), 0 0 100px rgba(34, 197, 94, 0.15); }
}

.success-title {
    font-size: 1.8rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.success-subtitle {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

/* ---- Error Message ---- */
.custom-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-sm);
    padding: 1rem 1.2rem;
    margin-top: 0.5rem;
    animation: shakeIn 0.5s ease;
}

.custom-error .error-icon {
    font-size: 1.2rem;
    margin-right: 0.5rem;
}

.custom-error .error-text {
    font-size: 0.9rem;
    color: var(--accent-red);
    line-height: 1.6;
}

.custom-error .solution {
    background: var(--bg-editor);
    border-radius: 4px;
    padding: 0.5rem 0.8rem;
    margin-top: 0.5rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    color: var(--accent-green);
}

@keyframes shakeIn {
    0%, 100% { transform: translateX(0); }
    15%, 45%, 75% { transform: translateX(-5px); }
    30%, 60%, 90% { transform: translateX(5px); }
}

/* ---- Mission Select ---- */
.mission-select-section {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    text-align: center;
}

.mission-select-title {
    font-size: 1.8rem;
    font-weight: 800;
}

.mission-select-desc {
    color: var(--text-secondary);
    max-width: 600px;
    line-height: 1.7;
}

.mission-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    width: 100%;
    padding: 0 2rem;
}

.mission-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: left;
    position: relative;
    overflow: hidden;
}

.mission-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent-cyan));
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.mission-card:hover::before {
    opacity: 1;
}

.mission-card:hover {
    border-color: var(--accent-purple);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.mission-card.completed {
    border-color: var(--accent-green);
}

.mission-card.completed::before {
    background: var(--accent-green);
    opacity: 1;
}

.mission-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.mission-card.locked:hover {
    transform: none;
    border-color: var(--border-color);
    box-shadow: none;
}

.mission-card .mission-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.mission-card .mission-name {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.mission-card .mission-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.mission-card .mission-status {
    margin-top: 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.mission-card .mission-status.done {
    color: var(--accent-green);
}

.mission-card .mission-status.locked-text {
    color: var(--text-muted);
}

/* ---- Quiz Section ---- */
.quiz-section .quiz-header {
    text-align: center;
    padding: 2rem;
}

.quiz-section .quiz-editor {
    flex: 1;
}

/* ---- Admin Page ---- */
.admin-container {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 2rem;
}

.admin-header {
    text-align: center;
    margin-bottom: 2rem;
}

.admin-header h1 {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.submission-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.submission-card .sub-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.submission-card .sub-user {
    font-weight: 700;
    font-size: 1.1rem;
}

.submission-card .sub-date {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.submission-card .sub-code {
    background: var(--bg-editor);
    border-radius: var(--radius-sm);
    padding: 1rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    white-space: pre-wrap;
    margin-bottom: 1rem;
    max-height: 300px;
    overflow-y: auto;
}

.submission-card .sub-output {
    background: var(--bg-output);
    border-radius: var(--radius-sm);
    padding: 0.8rem;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    margin-bottom: 1rem;
    color: var(--accent-green);
    white-space: pre-wrap;
}

.rating-stars {
    display: flex;
    gap: 0.5rem;
    margin: 1rem 0;
}

.rating-stars .star {
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: color var(--transition-fast), transform var(--transition-fast);
}

.rating-stars .star:hover,
.rating-stars .star.active {
    color: var(--accent-orange);
    transform: scale(1.2);
}

.rating-stars .star-fail {
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0.3rem 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.rating-stars .star-fail:hover,
.rating-stars .star-fail.active {
    color: var(--accent-red);
    border-color: var(--accent-red);
    background: var(--accent-red-glow);
}

.admin-comment textarea {
    width: 100%;
    padding: 0.8rem;
    background: var(--bg-editor);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    resize: vertical;
    min-height: 80px;
    outline: none;
}

.admin-comment textarea:focus {
    border-color: var(--accent-purple);
}

/* ---- Tutorial Repeat Warning ---- */
.repeat-warning {
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid rgba(239, 68, 68, 0.3);
    border-radius: var(--radius-md);
    padding: 2rem;
    text-align: center;
    max-width: 500px;
    animation: fadeIn 0.5s ease;
}

.repeat-warning .warning-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.repeat-warning h3 {
    color: var(--accent-red);
    margin-bottom: 0.5rem;
}

.repeat-warning p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
    .learn-content {
        flex-direction: column;
    }

    .right-panel {
        width: 100%;
        min-width: 0;
        max-height: 300px;
        border-left: none;
        border-top: 1px solid var(--border-color);
    }

    .experience-options {
        flex-direction: column;
        align-items: center;
    }

    .mission-grid {
        grid-template-columns: 1fr;
    }
}

/* ---- Loading Spinner ---- */
.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ---- Transition overlay between sections ---- */
.transition-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-primary);
    z-index: 998;
    display: none;
    animation: overlayFade 0.6s ease forwards;
}

@keyframes overlayFade {
    0% { opacity: 0; }
    50% { opacity: 1; }
    100% { opacity: 0; }
}

/* ---- Test errors counter ---- */
.error-counter {
    display: flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.8rem;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 100px;
    font-size: 0.8rem;
    color: var(--accent-red);
    font-weight: 600;
}

/* Admin login */
.admin-login {
    max-width: 400px;
    margin: 4rem auto;
    text-align: center;
}

.admin-login input {
    width: 100%;
    padding: 0.8rem 1.2rem;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    outline: none;
    margin: 1rem 0;
}

.admin-login input:focus {
    border-color: var(--accent-purple);
}

/* Already rated badge */
.rated-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.3rem 0.8rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
}

.rated-badge.stars {
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent-orange);
}

.rated-badge.failed {
    background: rgba(239, 68, 68, 0.15);
    color: var(--accent-red);
}