/* ===== DESIGN TOKENS ===== */
:root {
    --color-bg: #0a0e27;
    --color-bg-secondary: #1a1f3a;
    --color-neon-cyan: #00ffff;
    --color-neon-purple: #ff00ff;
    --color-neon-green: #00ff41;
    --color-neon-blue: #0099ff;
    --color-text: #e0e0e0;
    --color-text-muted: #a0a0a0;
    --color-border: #1a2a4a;
    --color-success: #00ff41;
    --color-error: #ff3366;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
}

/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Courier New', 'Space Mono', monospace;
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===== TYPOGRAPHY ===== */
h1 {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    background: linear-gradient(90deg, var(--color-neon-cyan), var(--color-neon-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 0 20px rgba(0, 255, 255, 0.5);
}

h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

h3 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    letter-spacing: 0.08em;
}

p {
    margin-bottom: var(--spacing-md);
}

/* ===== BUTTONS ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--color-neon-cyan);
    background-color: transparent;
    color: var(--color-neon-cyan);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: var(--color-neon-cyan);
    transition: left var(--transition-normal);
    z-index: -1;
}

.btn:hover::before {
    left: 0;
}

.btn:hover {
    color: var(--color-bg);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.8), inset 0 0 20px rgba(0, 255, 255, 0.3);
}

.btn-primary {
    border-color: var(--color-neon-cyan);
    color: var(--color-neon-cyan);
}

.btn-primary::before {
    background-color: var(--color-neon-cyan);
}

.btn-secondary {
    border-color: var(--color-neon-purple);
    color: var(--color-neon-purple);
}

.btn-secondary::before {
    background-color: var(--color-neon-purple);
}

.btn-secondary:hover {
    box-shadow: 0 0 20px rgba(255, 0, 255, 0.8), inset 0 0 20px rgba(255, 0, 255, 0.3);
}

.btn-success {
    border-color: var(--color-neon-green);
    color: var(--color-neon-green);
}

.btn-success::before {
    background-color: var(--color-neon-green);
}

.btn-success:hover {
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.8), inset 0 0 20px rgba(0, 255, 65, 0.3);
}

.btn:active {
    transform: scale(0.95);
}

/* ===== INPUT FIELDS ===== */
input, textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    color: var(--color-text);
    font-family: inherit;
    font-size: 1rem;
    border-radius: 4px;
    transition: all var(--transition-normal);
    margin-bottom: var(--spacing-md);
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--color-neon-cyan);
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
}

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

/* ===== CONTAINERS ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

.card {
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: all var(--transition-normal);
}

.card:hover {
    border-color: var(--color-neon-cyan);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}

.card.active {
    border-color: var(--color-neon-purple);
    box-shadow: 0 0 20px rgba(255, 0, 255, 0.4);
}

/* ===== LAYOUT ===== */
.flex {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.flex-column {
    flex-direction: column;
    align-items: stretch;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* ===== PAGES ===== */
.page {
    display: none;
    animation: fadeIn var(--transition-normal);
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== HEADER/NAV ===== */
.header {
    background-color: var(--color-bg-secondary);
    border-bottom: 2px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-title {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: linear-gradient(90deg, var(--color-neon-cyan), var(--color-neon-purple));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===== HOME PAGE ===== */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.05) 0%, rgba(255, 0, 255, 0.05) 100%);
    padding: var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 255, 255, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
    animation: moveGrid 20s linear infinite;
    z-index: 0;
}

@keyframes moveGrid {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(50px, 50px);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-tagline {
    font-size: 1.5rem;
    color: var(--color-neon-cyan);
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
    letter-spacing: 0.05em;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.intro-section {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    max-width: 600px;
}

/* ===== AUTH FORMS ===== */
.auth-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.05) 0%, rgba(255, 0, 255, 0.05) 100%);
}

.form-box {
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-neon-cyan);
    border-radius: 8px;
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 400px;
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.2);
}

.form-box h2 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-size: 0.9rem;
    color: var(--color-neon-cyan);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-toggle {
    text-align: center;
    margin-top: var(--spacing-md);
    color: var(--color-text-muted);
}

.form-toggle a {
    color: var(--color-neon-cyan);
    cursor: pointer;
    text-decoration: none;
    font-weight: 600;
}

.form-toggle a:hover {
    text-decoration: underline;
}

/* ===== DASHBOARD ===== */
.dashboard-header {
    background: linear-gradient(90deg, var(--color-neon-cyan) 0%, var(--color-neon-purple) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: var(--spacing-lg);
}

.user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 8px;
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.module-card {
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 255, 255, 0.1), transparent);
    transition: left var(--transition-slow);
}

.module-card:hover::before {
    left: 100%;
}

.module-card:hover {
    border-color: var(--color-neon-cyan);
    box-shadow: 0 0 20px rgba(0, 255, 255, 0.4);
    transform: translateY(-5px);
}

.module-card.completed {
    border-color: var(--color-neon-green);
}

.module-card.completed::after {
    content: '✓';
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    color: var(--color-neon-green);
    font-size: 1.5rem;
    font-weight: 900;
}

.module-card h3 {
    margin-bottom: var(--spacing-sm);
}

.module-progress {
    width: 100%;
    height: 6px;
    background-color: var(--color-bg);
    border-radius: 3px;
    overflow: hidden;
    margin-top: var(--spacing-sm);
}

.module-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-neon-cyan), var(--color-neon-green));
    width: 0%;
    transition: width var(--transition-normal);
}

/* ===== MODULE VIEW ===== */
.module-view {
    max-width: 100%;
    margin: 0 auto;
}

.lesson-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.lesson-left {
    min-width: 0;
}

.lesson-right {
    min-width: 0;
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
    color: var(--color-neon-cyan);
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
    font-size: 1rem;
}

.back-button:hover {
    text-decoration: underline;
}

.lessons-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.lesson-card {
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-md);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.lesson-card:hover {
    border-color: var(--color-neon-cyan);
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
}

.lesson-card.completed {
    border-color: var(--color-neon-green);
}

.lesson-card.completed::after {
    content: '✓';
    display: block;
    color: var(--color-neon-green);
    font-weight: 900;
}

.lesson-card.active {
    border-color: var(--color-neon-purple);
    box-shadow: 0 0 20px rgba(255, 0, 255, 0.5);
}

.lesson-content {
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

/* ===== QUIZ ===== */
.quiz-container {
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-neon-purple);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.quiz-question {
    margin-bottom: var(--spacing-lg);
}

.quiz-question h4 {
    margin-bottom: var(--spacing-md);
    color: var(--color-neon-purple);
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.quiz-option {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: 4px;
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.quiz-option:hover {
    border-color: var(--color-neon-cyan);
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
}

.quiz-option input[type="radio"] {
    cursor: pointer;
    width: auto;
    margin: 0;
}

.quiz-option.selected {
    border-color: var(--color-neon-cyan);
    background-color: rgba(0, 255, 255, 0.1);
}

.quiz-option.correct {
    border-color: var(--color-neon-green);
    background-color: rgba(0, 255, 65, 0.1);
}

.quiz-option.incorrect {
    border-color: var(--color-error);
    background-color: rgba(255, 51, 102, 0.1);
}

.quiz-results {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background-color: var(--color-bg);
    border: 2px solid var(--color-border);
    border-radius: 8px;
    text-align: center;
}

.quiz-results.passed {
    border-color: var(--color-neon-green);
    background-color: rgba(0, 255, 65, 0.05);
}

.quiz-results.failed {
    border-color: var(--color-error);
    background-color: rgba(255, 51, 102, 0.05);
}

.quiz-score {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(90deg, var(--color-neon-cyan), var(--color-neon-green));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.8rem;
    }

    .container {
        padding: var(--spacing-md);
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .flex {
        flex-direction: column;
        align-items: stretch;
    }

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

    .header {
        flex-direction: column;
    }

    .nav-buttons {
        width: 100%;
        flex-direction: column;
    }

    .nav-buttons .btn {
        width: 100%;
    }

    .lesson-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .code-editor-panel {
        position: static;
        min-height: 300px;
    }

    .code-input {
        min-height: 200px;
    }
}

/* ===== ANIMATIONS ===== */
@keyframes glow {
    0%, 100% {
        box-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
    }
    50% {
        box-shadow: 0 0 20px rgba(0, 255, 255, 0.8);
    }
}

.glowing {
    animation: glow var(--transition-slow) infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.pulse {
    animation: pulse var(--transition-normal) infinite;
}

/* ===== ERROR/SUCCESS MESSAGES ===== */
.alert {
    padding: var(--spacing-md);
    border-radius: 4px;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
    animation: slideDown var(--transition-normal);
}

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

.alert-success {
    background-color: rgba(0, 255, 65, 0.1);
    border: 2px solid var(--color-neon-green);
    color: var(--color-neon-green);
}

.alert-error {
    background-color: rgba(255, 51, 102, 0.1);
    border: 2px solid var(--color-error);
    color: var(--color-error);
}

/* ===== CODE EDITOR ===== */
.code-editor-panel {
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-neon-green);
    border-radius: 8px;
    padding: var(--spacing-lg);
    height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.2);
    position: sticky;
    top: var(--spacing-lg);
}

.code-editor-header {
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-neon-green);
}

.code-editor-header h3 {
    margin: 0;
    color: var(--color-neon-green);
    font-size: 1.2rem;
}

.code-editor-header p {
    margin: 0;
}

.code-input {
    flex: 1;
    min-height: 250px;
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-neon-green);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: none;
    margin-bottom: var(--spacing-sm);
}

.code-input:focus {
    outline: none;
    border-color: var(--color-neon-green);
    box-shadow: 0 0 10px rgba(0, 255, 65, 0.3);
}

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

.code-output {
    min-height: 150px;
    max-height: 250px;
    overflow-y: auto;
    padding: var(--spacing-md);
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    margin-top: var(--spacing-sm);
}

.code-result {
    color: var(--color-neon-green);
}

.code-result pre {
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 0.85rem;
    line-height: 1.4;
}

.code-error {
    color: var(--color-error);
    font-size: 0.9rem;
    line-height: 1.4;
}

.code-message {
    color: var(--color-neon-cyan);
    font-size: 0.9rem;
    font-style: italic;
}

/* Scrollbar styling */
.code-output::-webkit-scrollbar {
    width: 8px;
}

.code-output::-webkit-scrollbar-track {
    background: var(--color-bg);
    border-radius: 4px;
}

.code-output::-webkit-scrollbar-thumb {
    background: var(--color-neon-green);
    border-radius: 4px;
}

.code-output::-webkit-scrollbar-thumb:hover {
    background: var(--color-neon-cyan);
}

/* ===== ADMIN SIDEBAR ===== */
.admin-container {
    display: flex;
    gap: 0;
    min-height: 100vh;
    background-color: var(--color-bg);
}

.admin-sidebar {
    width: 300px;
    background-color: var(--color-bg-secondary);
    border-right: 2px solid var(--color-neon-cyan);
    padding: var(--spacing-lg);
    overflow-y: auto;
    position: relative;
}

.admin-sidebar h3 {
    color: var(--color-neon-cyan);
    font-size: 1.2rem;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid rgba(0, 255, 255, 0.3);
}

.admin-sidebar-section {
    margin-bottom: var(--spacing-lg);
}

.sidebar-item {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    color: var(--color-text);
    text-align: left;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.sidebar-item:hover {
    background-color: rgba(0, 255, 255, 0.1);
    border-color: var(--color-neon-cyan);
    color: var(--color-neon-cyan);
}

.sidebar-item.active {
    background-color: rgba(0, 255, 255, 0.2);
    border-color: var(--color-neon-cyan);
    color: var(--color-neon-cyan);
    font-weight: 600;
}

.admin-main {
    flex: 1;
    padding: var(--spacing-lg);
    overflow-y: auto;
}

.admin-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--color-neon-cyan);
}

.admin-header-bar h2 {
    color: var(--color-neon-cyan);
    font-size: 2rem;
}

.sidebar-scroll {
    max-height: 300px;
    overflow-y: auto;
}

.sidebar-scroll::-webkit-scrollbar {
    width: 8px;
}

.sidebar-scroll::-webkit-scrollbar-track {
    background: rgba(0, 255, 255, 0.1);
}

.sidebar-scroll::-webkit-scrollbar-thumb {
    background: var(--color-neon-cyan);
    border-radius: 4px;
}

.sidebar-scroll::-webkit-scrollbar-thumb:hover {
    background: var(--color-neon-purple);
}

@media (max-width: 768px) {
    .admin-container {
        flex-direction: column;
    }

    .admin-sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 2px solid var(--color-neon-cyan);
        padding: var(--spacing-md);
        display: flex;
        gap: var(--spacing-lg);
        overflow-x: auto;
        overflow-y: visible;
    }

    .admin-sidebar-section {
        flex: 0 0 auto;
        margin-bottom: 0;
        min-width: 200px;
    }

    .admin-main {
        padding: var(--spacing-md);
    }
}