/* ============================================
   PYTHON ZERO - MAIN STYLES
   Vintage Terminal Aesthetic
   ============================================ */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Colors - refined palette with less green overload */
    --color-bg: #0a0a0a;
    --color-bg-elevated: #111111;
    --color-primary: #00d26a;
    --color-primary-dim: #0a5c32;
    --color-primary-glow: rgba(0, 210, 106, 0.15);
    --color-secondary: #00ff88;
    --color-accent: #00b4d8;
    --color-text: #b8b8b8;
    --color-text-dim: #666666;
    --color-error: #ff4757;
    --color-warning: #ffa502;
    --color-success: #2ed573;
    --color-border: #1a3d2a;
    --color-border-bright: #00d26a;
    --color-panel-bg: #0d0d0d;

    /* Typography */
    --font-main: 'JetBrains Mono', 'Courier New', Courier, monospace;
    --font-size-base: 14px;
    --font-size-small: 12px;
    --font-size-large: 16px;

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    /* Borders */
    --border-width: 1px;
    --border-radius: 4px;

    /* Animation */
    --transition-speed: 0.2s;

    /* Layout */
    --header-height: 56px;
    --footer-height: 36px;
    --panel-header-height: 40px;
}

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

html {
    font-size: var(--font-size-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
    border: 1px solid var(--color-primary-dim);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary-dim);
    border: 1px solid var(--color-primary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary);
}

/* ============================================
   LAYOUT
   ============================================ */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: 100%;
}

/* ============================================
   HEADER
   ============================================ */
#header {
    height: var(--header-height);
    background-color: var(--color-bg);
    border-bottom: var(--border-width) solid var(--color-border);
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--font-size-large);
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-primary);
    text-shadow: 0 0 10px var(--color-primary);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
}

.menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-primary);
    transition: all var(--transition-speed);
}

.menu-toggle:hover span {
    box-shadow: 0 0 10px var(--color-primary);
}

/* ============================================
   MAIN CONTENT
   ============================================ */
#main-content {
    display: grid;
    grid-template-columns: 300px 1fr 350px;
    gap: 0;
    flex: 1;
    overflow: hidden;
}

/* ============================================
   PANELS
   ============================================ */
.panel {
    background-color: var(--color-panel-bg);
    border-right: var(--border-width) solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.panel:last-child {
    border-right: none;
}

.panel-header {
    height: var(--panel-header-height);
    background-color: var(--color-bg);
    border-bottom: var(--border-width) solid var(--color-border);
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.panel-title {
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--color-primary);
}

.panel-close {
    background: none;
    border: none;
    color: var(--color-primary);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: none;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-speed);
}

.panel-close:hover {
    color: var(--color-secondary);
    text-shadow: 0 0 10px var(--color-primary);
}

.panel-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
}

/* ============================================
   NAVIGATION PANEL
   ============================================ */
.panel-nav {
    /* Styles inherited from .panel */
}

.terminal-text {
    font-family: var(--font-main);
}

.command-prompt {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

.track {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-speed);
    display: flex;
    justify-content: space-between;
}

.track:hover {
    border-color: var(--color-primary);
    background-color: rgba(10, 255, 10, 0.05);
    box-shadow: 0 0 10px rgba(10, 255, 10, 0.2);
}

.track-name {
    font-weight: 700;
}

.track-count {
    color: var(--color-primary-dim);
    font-size: var(--font-size-small);
}

/* ============================================
   EDITOR PANEL
   ============================================ */
.panel-editor {
    display: flex;
    flex-direction: column;
}

.editor-controls {
    display: flex;
    gap: var(--spacing-sm);
}

/* ============================================
   OUTPUT SECTION
   ============================================ */
.output-section {
    border-top: var(--border-width) solid var(--color-border);
    display: flex;
    flex-direction: column;
    height: 200px;
    flex-shrink: 0;
}

.output-header {
    height: var(--panel-header-height);
    background-color: var(--color-bg);
    border-bottom: var(--border-width) solid var(--color-border);
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-shrink: 0;
}

.status-bar {
    display: flex;
    gap: var(--spacing-md);
    margin-left: auto;
    font-size: var(--font-size-small);
}

#status {
    color: var(--color-primary);
}

#error-count {
    color: var(--color-primary);
}

.output-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    font-family: var(--font-main);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.output-line {
    margin-bottom: var(--spacing-xs);
}

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

/* ============================================
   HELP PANEL
   ============================================ */
.panel-help {
    /* Styles inherited from .panel */
}

.help-content h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-large);
    text-shadow: 0 0 10px var(--color-primary);
}

.help-content h4 {
    color: var(--color-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
}

.help-content p {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.help-content ul {
    list-style: none;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.help-content ul li {
    margin-bottom: var(--spacing-sm);
    position: relative;
}

.help-content ul li::before {
    content: '▸ ';
    position: absolute;
    left: -16px;
    color: var(--color-primary);
}

.help-content strong {
    color: var(--color-secondary);
}

.tip {
    background-color: rgba(10, 255, 10, 0.05);
    border: 1px solid var(--color-primary);
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.tip strong {
    color: var(--color-secondary);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    font-family: var(--font-main);
    font-size: var(--font-size-base);
    font-weight: 700;
    padding: var(--spacing-sm) var(--spacing-md);
    border: var(--border-width) solid var(--color-border);
    background-color: var(--color-bg);
    color: var(--color-primary);
    cursor: pointer;
    transition: all var(--transition-speed);
    letter-spacing: 1px;
}

.btn:hover {
    background-color: var(--color-primary);
    color: var(--color-bg);
    box-shadow: 0 0 20px var(--color-primary);
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--color-primary-dim);
    color: var(--color-primary);
}

.btn-primary:hover {
    background-color: var(--color-primary);
    color: var(--color-bg);
}

.btn-secondary {
    /* Uses default .btn styles */
}

.btn-small {
    padding: 4px var(--spacing-sm);
    font-size: var(--font-size-small);
}

/* ============================================
   FOOTER
   ============================================ */
#footer {
    height: var(--footer-height);
    background-color: var(--color-bg);
    border-top: var(--border-width) solid var(--color-border);
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-content {
    font-size: var(--font-size-small);
    color: var(--color-primary-dim);
}

.footer-content a {
    color: var(--color-primary);
    text-decoration: none;
    transition: all var(--transition-speed);
}

.footer-content a:hover {
    color: var(--color-secondary);
    text-shadow: 0 0 10px var(--color-primary);
}

.separator {
    margin: 0 var(--spacing-sm);
}

kbd {
    background-color: var(--color-primary-dim);
    color: var(--color-bg);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: var(--font-main);
    font-size: var(--font-size-small);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.hidden {
    display: none !important;
}

.text-error {
    color: var(--color-error);
}

.text-warning {
    color: var(--color-warning);
}

.text-success {
    color: var(--color-secondary);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes glow {
    0%, 100% {
        text-shadow: 0 0 10px var(--color-primary);
    }
    50% {
        text-shadow: 0 0 20px var(--color-primary);
    }
}

.glow {
    animation: glow 2s ease-in-out infinite;
}

/* ============================================
   LESSON NAVIGATION
   ============================================ */
.lesson-back {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    color: var(--color-primary);
    border: 1px solid var(--color-primary-dim);
    transition: all var(--transition-speed);
}

.lesson-back:hover {
    border-color: var(--color-primary);
    background-color: rgba(10, 255, 10, 0.05);
}

.lesson-item {
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-speed);
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.lesson-item:hover {
    border-color: var(--color-primary);
    background-color: rgba(10, 255, 10, 0.05);
    box-shadow: 0 0 10px rgba(10, 255, 10, 0.2);
}

.lesson-item.active {
    border-color: var(--color-primary);
    background-color: rgba(10, 255, 10, 0.1);
}

.lesson-number {
    color: var(--color-primary-dim);
    font-size: var(--font-size-small);
    min-width: 30px;
}

.lesson-item .lesson-title {
    flex: 1;
    color: var(--color-primary);
}

/* ============================================
   LESSON VIEWER
   ============================================ */
.lesson-viewer {
    background-color: var(--color-bg);
    border-bottom: var(--border-width) solid var(--color-border);
    max-height: 400px;
    overflow-y: auto;
    display: none;
}

.lesson-header {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-primary-dim);
    position: relative;
}

#close-lesson {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
}

.lesson-meta {
    padding-right: 80px;
}

.lesson-title {
    color: var(--color-primary);
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 0 10px var(--color-primary);
}

.lesson-description {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.lesson-info {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-small);
    color: var(--color-primary-dim);
}

.lesson-difficulty {
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

.content-text {
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
    line-height: 1.7;
}

.content-code {
    background-color: rgba(10, 255, 10, 0.03);
    border: 1px solid var(--color-primary-dim);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.content-code pre {
    margin: 0;
    margin-bottom: var(--spacing-sm);
    overflow-x: auto;
}

.content-code code {
    color: var(--color-secondary);
    font-family: var(--font-main);
    font-size: var(--font-size-small);
}

.code-explanation {
    color: var(--color-primary-dim);
    font-size: var(--font-size-small);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.content-tip {
    background-color: rgba(10, 255, 10, 0.05);
    border-left: 3px solid var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.content-exercise {
    background-color: rgba(10, 255, 10, 0.05);
    border: 2px solid var(--color-primary);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.content-exercise h4 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.content-exercise p {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
}

.content-exercise .btn {
    margin-right: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.lesson-footer {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md);
    border-top: 1px solid var(--color-primary-dim);
}