/* ==============================================
   MONKEY SCHOOL - MODERN DESIGN SYSTEM
   ============================================== */

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Professional Dark Theme */
    --bg-primary: #0f1115;
    --bg-secondary: #1a1d25;
    --bg-tertiary: #252a35;
    --bg-hover: #2c3240;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-primary: #10b981;
    --accent-secondary: #34d399;
    --accent-hover: #059669;
    
    --border-color: #334155;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

code, pre {
    font-family: var(--font-mono);
}

/* ==============================================
   TYPOGRAPHY
   ============================================== */
h1 { font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 800; line-height: 1.1; }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 700; line-height: 1.2; }
h3 { font-size: 1.5rem; font-weight: 600; line-height: 1.3; }
h4 { font-size: 1.125rem; font-weight: 600; line-height: 1.4; }
p { font-size: 1rem; color: var(--text-secondary); }

/* ==============================================
   BUTTONS
   ============================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-danger {
    background-color: #ef4444;
    color: white;
}

.btn-danger:hover {
    background-color: #dc2626;
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-md);
}

/* ==============================================
   CARDS
   ============================================== */
.card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.card-content {
    padding: var(--spacing-xl);
}

/* ==============================================
   NAVIGATION
   ============================================== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.navbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-icon {
    font-size: 2rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-xl);
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--spacing-sm) 0;
    transition: color 0.2s ease;
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-primary);
    transition: width 0.2s ease;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.1rem;
    color: white;
    cursor: pointer;
    transition: transform 0.2s ease;
    overflow: hidden;
}

.user-avatar:hover {
    transform: scale(1.05);
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ==============================================
   HERO SECTION
   ============================================== */
.hero {
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-content h1 {
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-content p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-preview {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-sm);
    box-shadow: var(--shadow-xl);
}

.preview-header {
    display: flex;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.preview-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot-red { background-color: #ef4444; }
.dot-yellow { background-color: #f59e0b; }
.dot-green { background-color: #10b981; }

.preview-code {
    background-color: var(--bg-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: #a5b4fc;
    overflow: hidden;
}

.preview-code .tag { color: #60a5fa; }
.preview-code .attr { color: #f97316; }
.preview-code .string { color: #34d399; }
.preview-code .comment { color: var(--text-muted); }

/* ==============================================
   FEATURES SECTION
   ============================================== */
.section {
    padding: var(--spacing-2xl) var(--spacing-xl);
}

.section-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title h2 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    text-align: center;
    padding: var(--spacing-xl);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-xl);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.feature-card h4 {
    margin-bottom: var(--spacing-sm);
}

/* ==============================================
   LESSONS SECTION
   ============================================== */
.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.lesson-card {
    cursor: pointer;
}

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

.lesson-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.lesson-progress {
    margin-top: var(--spacing-md);
}

.progress-bar {
    height: 6px;
    background-color: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--spacing-xs);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 3px;
    transition: width 0.3s ease;
}

/* ==============================================
   FORM ELEMENTS
   ============================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.error-message {
    color: #ef4444;
    font-size: 0.875rem;
    margin-top: var(--spacing-xs);
    text-align: center;
}

/* ==============================================
   AUTH PAGES
   ============================================== */
.auth-container {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.auth-card {
    max-width: 440px;
    width: 100%;
}

.auth-card h2 {
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.auth-card .subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.divider {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
    color: var(--text-muted);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background-color: var(--border-color);
}

.google-btn {
    width: 100%;
    background-color: white;
    color: #1f2937;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-weight: 600;
}

.google-btn:hover {
    background-color: #f3f4f6;
}

/* ==============================================
   PROFILE PAGE
   ============================================== */
.profile-container {
    max-width: 800px;
    margin: var(--spacing-2xl) auto;
    padding: 0 var(--spacing-xl);
}

.profile-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.profile-avatar {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 700;
    color: white;
    overflow: hidden;
}

.profile-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.profile-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.detail-item {
    padding: var(--spacing-lg);
}

.detail-item h4 {
    color: var(--text-muted);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.detail-item p {
    font-size: 1.125rem;
    color: var(--text-primary);
}

/* ==============================================
   FOOTER
   ============================================== */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-2xl) var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.footer p {
    color: var(--text-muted);
}

/* ==============================================
   EDITOR PAGE
   ============================================== */
.editor-page {
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.editor-navbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.editor-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    margin-right: auto;
}

.editor-toolbar {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.editor-toolbar .btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.editor-main {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.editor-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.panel-header {
    background-color: var(--bg-tertiary);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h4 {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.editor-textarea {
    flex: 1;
    width: 100%;
    padding: var(--spacing-lg);
    background-color: var(--bg-primary);
    color: #e2e8f0;
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    line-height: 1.6;
    border: none;
    outline: none;
    resize: none;
}

.preview-frame {
    flex: 1;
    width: 100%;
    border: none;
    background-color: white;
}

.panel-divider {
    width: 6px;
    background-color: var(--bg-tertiary);
    cursor: col-resize;
    transition: background-color 0.2s ease;
}

.panel-divider:hover {
    background-color: var(--accent-primary);
}

.preview-controls {
    display: flex;
    gap: var(--spacing-xs);
}

.preview-size-btn {
    width: 36px;
    height: 32px;
    padding: 0;
    font-size: 1.125rem;
}

.mobile-tabs {
    display: none;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.mobile-tab {
    flex: 1;
    padding: var(--spacing-md);
    text-align: center;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.mobile-tab.active {
    color: var(--text-primary);
    border-bottom: 2px solid var(--accent-primary);
}

/* ==============================================
   RESPONSIVE DESIGN
   ============================================== */
@media (max-width: 968px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .editor-main {
        flex-direction: column;
    }
    
    .panel-divider {
        display: none;
    }
    
    .mobile-tabs {
        display: flex;
    }
    
    .editor-panel {
        display: none;
    }
    
    .editor-panel.active {
        display: flex;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .navbar-inner {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .profile-header {
        flex-direction: column;
        text-align: center;
    }
}

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

.text-center { text-align: center; }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.loading { opacity: 0.7; pointer-events: none; }