/* ============================================================================
   CSS Custom Properties - Design System
   ========================================================================= */
:root {
    /* Spacing Scale */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Color Palette */
    --color-primary: #667eea;
    --color-primary-dark: #764ba2;
    --color-secondary: #00d4ff;
    --color-success: #4CAF50;
    --color-danger: #FF6B6B;
    --color-warning: #FF9800;

    /* Text Colors */
    --color-text-primary: #ffffff;
    --color-text-secondary: #e8e8e8;
    --color-text-muted: #aaaaaa;
    --color-text-disabled: #666666;

    /* Background Colors */
    --color-bg-dark: #000000;
    --color-bg-card: rgba(20, 20, 40, 0.9);
    --color-bg-overlay: rgba(255, 255, 255, 0.1);
    --color-bg-overlay-hover: rgba(255, 255, 255, 0.15);

    /* Border Colors */
    --color-border-default: rgba(255, 255, 255, 0.2);
    --color-border-hover: rgba(255, 255, 255, 0.4);
    --color-border-primary: rgba(0, 150, 255, 0.5);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #0066cc, #0099ff);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --gradient-danger: linear-gradient(135deg, #FF6B6B 0%, #C92A2A 100%);
    --gradient-dark: linear-gradient(135deg, #434343 0%, #000000 100%);
    --gradient-bg: linear-gradient(135deg, #0a0618, #1a1033, #0f0c29);

    /* Z-index Layers */
    --z-base: 0;
    --z-header: 1000;
    --z-nav: 2000;
    --z-overlay: 5000;
    --z-modal: 10000;

    /* Typography Scale */
    --font-size-xs: clamp(0.75rem, 2vw, 0.85rem);
    --font-size-sm: clamp(0.85rem, 2vw, 0.95rem);
    --font-size-base: clamp(0.95rem, 2.5vw, 1.1rem);
    --font-size-lg: clamp(1.1rem, 3vw, 1.3rem);
    --font-size-xl: clamp(1.3rem, 3.5vw, 1.6rem);
    --font-size-2xl: clamp(1.5rem, 4vw, 2rem);
    --font-size-3xl: clamp(1.8rem, 5vw, 2.5rem);
    --font-size-4xl: clamp(2rem, 6vw, 3rem);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 5px;
    --radius-md: 8px;
    --radius-lg: 10px;
    --radius-xl: 12px;
    --radius-2xl: 15px;

    /* Shadows */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 6px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 10px 20px rgba(0, 0, 0, 0.3);
}

/* ============================================================================
   Global Styles
   ========================================================================= */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    width: 100vw;
    height: 100vh;
    margin: 0;
    padding: 0;
    background-color: var(--color-bg-dark);
    color: var(--color-text-primary);
    font-family: Roboto, sans-serif;
    font-size: 16px;
    overflow-x: hidden;
}

#gameCanvas {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    background: transparent;
}

/* ============================================================================
   Header Layout
   ========================================================================= */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border-default);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.header-left {
    flex-shrink: 0;
}

.app-title {
    margin: 0;
    font-size: var(--font-size-lg);
    font-weight: bold;
    color: var(--color-text-primary);
}

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

.nav-link {
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: bold;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
    white-space: nowrap;
}

.editor-link {
    display: none;
    background: rgba(76, 175, 80, 0.8);
}

.editor-link:hover {
    background: rgba(76, 175, 80, 1);
    transform: scale(1.05);
}

.settings-link {
    display: none;
    background: rgba(33, 150, 243, 0.8);
}

.settings-link:hover {
    background: rgba(33, 150, 243, 1);
    transform: scale(1.05);
}

.leaderboard-link {
    background: rgba(255, 215, 0, 0.8);
    color: #000 !important;
}

.leaderboard-link:hover {
    background: rgba(255, 215, 0, 1);
    transform: scale(1.05);
}

/* User Profile in Header */
.user-profile {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg-overlay);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
}

.user-profile-name {
    color: var(--color-text-secondary);
    font-weight: 500;
}

.user-profile-button {
    padding: var(--space-sm) var(--space-md);
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-sm);
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition-base);
}

.user-profile-button:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.6);
}

/* ============================================================================
   Main Content Area
   ========================================================================= */
#mainDiv {
    position: absolute;
    top: 80px; /* Below header */
    left: 0;
    right: 0;
    z-index: var(--z-base);
    overflow-y: auto;
    overflow-x: hidden;
    padding: 0 var(--space-md);
}

#loadingDiv {
    z-index: var(--z-header);
    color: var(--color-text-primary);
    text-align: center;
    padding: var(--space-xl);
}

#startButton {
    background-color: var(--color-bg-dark);
    color: var(--color-text-primary);
    border: 2px solid var(--color-text-primary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: var(--font-size-3xl);
    padding: var(--space-lg) var(--space-3xl);
    display: none;
    z-index: var(--z-header);
    transition: all var(--transition-base);
}

#startButton.ready {
    display: block;
    background-color: var(--color-danger);
}

#startButton:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

/* ============================================================================
   Level Selection
   ========================================================================= */
#levelSelect {
    display: none;
    text-align: center;
    color: var(--color-text-primary);
    opacity: 0;
    transition: opacity var(--transition-slow);
    padding: var(--space-lg) 0;
}

#levelSelect.ready {
    display: block;
    opacity: 1;
}

/* Hero Section */
.hero {
    margin-bottom: var(--space-2xl);
}

.hero-title {
    font-size: var(--font-size-4xl);
    margin: 0 0 var(--space-md) 0;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: bold;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-muted);
    margin: 0;
}

/* Level Section */
.level-section {
    margin-bottom: var(--space-2xl);
}

.level-header {
    font-size: var(--font-size-2xl);
    color: var(--color-text-primary);
    margin: 0 0 var(--space-md) 0;
}

.level-description {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    margin: 0 0 var(--space-xl) 0;
}

/* Progress Bar */
.progress-bar-container {
    background: var(--color-bg-overlay);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-xl);
    padding: var(--space-lg);
    margin: 0 auto var(--space-xl);
    max-width: 600px;
}

.progress-bar-title {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    margin: 0 0 var(--space-md) 0;
}

.progress-bar-track {
    width: 100%;
    height: 12px;
    background: rgba(0, 0, 0, 0.5);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.progress-percentage {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin: 0;
}

/* Level Cards */
.card-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
    max-width: 1200px;
    margin: 0 auto var(--space-2xl);
    padding: 0 var(--space-lg);
}

.no-levels-message {
    grid-column: 1 / -1;
    text-align: center;
    padding: var(--space-2xl) var(--space-lg);
    color: var(--color-text-muted);
}

.no-levels-message h2 {
    margin-bottom: var(--space-lg);
}

.no-levels-message p {
    margin-bottom: var(--space-xl);
}

.level-card {
    background: var(--color-bg-card);
    border: 2px solid var(--color-border-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-xl) var(--space-lg);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.level-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-secondary);
    box-shadow: 0 8px 16px rgba(0, 150, 255, 0.4);
}

.level-card-locked {
    background: rgba(20, 20, 40, 0.5);
    border: 2px solid rgba(255, 255, 255, 0.1);
    opacity: 0.6;
    cursor: not-allowed;
}

.level-card-locked:hover {
    transform: none;
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: var(--shadow-sm);
}

.level-card-completed {
    border-color: #4ade80;
    box-shadow: 0 4px 12px rgba(74, 222, 128, 0.3);
}

.level-card-current {
    border: 2px solid #667eea;
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
    }
    50% {
        box-shadow: 0 0 30px rgba(102, 126, 234, 0.6);
    }
}

.level-card-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: var(--space-md);
}

.level-card-title {
    color: var(--color-secondary);
    font-size: var(--font-size-2xl);
    margin: 0;
    text-transform: uppercase;
}

.level-card-locked .level-card-title {
    color: var(--color-text-disabled);
}

.level-card-badge {
    font-size: var(--font-size-xs);
    background: #667eea;
    padding: 4px 8px;
    border-radius: 4px;
    color: white;
    font-weight: bold;
}

.level-card-status {
    font-size: 1.5em;
}

.level-card-status-complete {
    color: #4ade80;
}

.level-card-status-locked {
    color: var(--color-text-disabled);
}

.level-lock-reason {
    font-size: var(--font-size-sm);
    color: #FF9800;
    margin: var(--space-sm) 0;
    padding: var(--space-sm);
    background: rgba(255, 152, 0, 0.1);
    border-radius: var(--radius-sm);
    border-left: 3px solid #FF9800;
}

.level-meta {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin: 0 0 var(--space-md) 0;
}

.level-card-description {
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    line-height: 1.6;
    margin: 0 0 var(--space-lg) 0;
    min-height: 50px;
}

.level-button {
    background: var(--gradient-secondary);
    color: var(--color-text-primary);
    border: none;
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-base);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    width: 100%;
}

.level-button:hover {
    background: linear-gradient(135deg, #0088ff, #00bbff);
    box-shadow: 0 4px 12px rgba(0, 150, 255, 0.6);
    transform: scale(1.05);
}

.level-button:active {
    transform: scale(0.98);
}

.level-button:focus-visible {
    outline: 2px solid var(--color-secondary);
    outline-offset: 2px;
}

/* TODO: Re-enable copy button functionality for copying default levels to custom levels */
.level-button-secondary {
    display: none !important;
}

/* Test Level Button */
.test-level-button {
    background: var(--gradient-danger);
    color: var(--color-text-primary);
    border: 2px solid rgba(255, 107, 107, 0.5);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: var(--font-size-base);
    font-weight: bold;
    transition: all var(--transition-base);
    margin-bottom: var(--space-md);
    box-shadow: var(--shadow-sm);
}

.test-level-button:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.6);
    border-color: rgba(255, 107, 107, 0.8);
}

.test-level-button:focus-visible {
    outline: 2px solid var(--color-danger);
    outline-offset: 2px;
}

/* ============================================================================
   Controls Info Section
   ========================================================================= */
.controls-info {
    background: var(--color-bg-overlay);
    border: 2px solid var(--color-border-default);
    border-radius: var(--radius-2xl);
    padding: var(--space-xl);
    margin: 0 auto var(--space-2xl);
    max-width: 900px;
    backdrop-filter: blur(10px);
}

.controls-info summary {
    cursor: pointer;
    font-size: var(--font-size-2xl);
    color: var(--color-success);
    text-shadow: 0 0 10px rgba(76, 175, 80, 0.5);
    margin-bottom: var(--space-lg);
    list-style: none;
    padding: var(--space-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.controls-info summary:hover {
    background: var(--color-bg-overlay);
}

.controls-info summary:focus-visible {
    outline: 2px solid var(--color-success);
    outline-offset: 2px;
}

.controls-info h2 {
    margin: 0 0 var(--space-lg) 0;
    font-size: var(--font-size-2xl);
    color: var(--color-success);
    text-shadow: 0 0 10px rgba(76, 175, 80, 0.5);
}

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

.control-section {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
}

.control-section h3 {
    margin: 0 0 var(--space-md) 0;
    color: #64B5F6;
    font-size: var(--font-size-lg);
}

.control-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.control-section li {
    margin-bottom: var(--space-md);
    padding-left: var(--space-lg);
    position: relative;
    line-height: 1.6;
    font-size: var(--font-size-sm);
}

.control-section li::before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
}

.control-section strong {
    color: #FFD54F;
}

.controls-note {
    background: rgba(255, 152, 0, 0.15);
    border: 1px solid rgba(255, 152, 0, 0.3);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-top: var(--space-lg);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    color: #FFE082;
}

/* ============================================================================
   Login Screen
   ========================================================================= */
.login-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.95);
    z-index: var(--z-modal);
}

.login-container {
    text-align: center;
    padding: var(--space-2xl);
    background: var(--color-bg-overlay);
    border: 2px solid var(--color-border-default);
    border-radius: var(--radius-2xl);
    max-width: 500px;
    width: 90%;
}

.login-title {
    font-size: var(--font-size-3xl);
    margin: 0 0 var(--space-lg) 0;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-subtitle {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    margin: 0 0 var(--space-xl) 0;
}

.login-button {
    padding: var(--space-md) var(--space-2xl);
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-base);
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 6px 25px rgba(102, 126, 234, 0.5);
}

.login-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.7);
}

.login-button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.login-skip {
    display: block;
    margin-top: var(--space-lg);
    color: var(--color-text-muted);
    text-decoration: underline;
    cursor: pointer;
    font-size: var(--font-size-sm);
}

.login-skip:hover {
    color: var(--color-text-primary);
}

/* ============================================================================
   Preloader
   ========================================================================= */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.95);
    z-index: var(--z-modal);
    padding: var(--space-lg);
}

.preloader-content {
    text-align: center;
    max-width: 600px;
    width: 100%;
}

.preloader-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.preloader-status {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    margin: var(--space-xl) 0 var(--space-lg) 0;
    min-height: 30px;
}

.preloader-progress-container {
    width: 100%;
    height: 12px;
    background: var(--color-bg-overlay);
    border-radius: var(--radius-sm);
    overflow: hidden;
    margin-bottom: var(--space-2xl);
}

.preloader-progress {
    width: 0%;
    height: 100%;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.preloader-button {
    display: none;
    padding: var(--space-lg) var(--space-3xl);
    background: var(--gradient-primary);
    color: var(--color-text-primary);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xl);
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: 0 6px 25px rgba(102, 126, 234, 0.5);
}

.preloader-button:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.7);
}

.preloader-button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.preloader-info {
    margin-top: var(--space-xl);
    font-size: var(--font-size-sm);
    color: var(--color-text-disabled);
}

/* ============================================================================
   Test Buttons & Links
   ========================================================================= */
.test-buttons-container {
    text-align: center;
    margin-top: var(--space-lg);
}

.test-buttons-container .test-level-button {
    margin: 0 var(--space-sm) var(--space-md);
}

.level-create-link {
    color: var(--color-success);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 600;
}

.level-create-link:hover {
    text-decoration: underline;
    color: #5ED35A;
}

.level-create-link:focus-visible {
    outline: 2px solid var(--color-success);
    outline-offset: 2px;
}

/* ============================================================================
   Editor & Settings Views
   ========================================================================= */
[data-view="editor"],
[data-view="settings"] {
    background: var(--gradient-bg);
    min-height: 100vh;
    padding: var(--space-md);
    overflow-y: auto;
}

.editor-container {
    max-width: 1200px;
    margin: 0 auto;
    color: var(--color-text-primary);
    padding-top: 80px; /* Account for header */
}

.editor-container h1 {
    text-align: center;
    font-size: var(--font-size-3xl);
    margin-bottom: var(--space-sm);
    text-shadow: 0 0 15px rgba(255,255,255,0.8);
    color: var(--color-text-primary);
    font-weight: bold;
}

.subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    font-size: var(--font-size-base);
    text-shadow: 0 1px 3px rgba(0,0,0,0.8);
}

.editor-grid,
.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.section {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.section h2 {
    margin-top: 0;
    font-size: var(--font-size-xl);
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
    padding-bottom: var(--space-sm);
    margin-bottom: var(--space-lg);
    color: var(--color-text-primary);
    font-weight: bold;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group select {
    width: 100%;
    padding: var(--space-md);
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: 1em;
    transition: all var(--transition-fast);
}

.form-group input::placeholder {
    color: #999;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--color-success);
    box-shadow: 0 0 8px rgba(76, 175, 80, 0.6);
    background: rgba(0, 0, 0, 0.6);
}

.form-group input:focus-visible,
.form-group select:focus-visible {
    outline: 2px solid var(--color-success);
    outline-offset: 1px;
}

.form-group select option {
    background: #1a1a1a;
    color: var(--color-text-primary);
}

.vector-input {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
}

.vector-input input {
    width: 100%;
}

.vector-label {
    text-align: center;
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xs);
    font-weight: 600;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.button-group {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    margin-top: var(--space-xl);
    flex-wrap: wrap;
}

.btn-primary,
.btn-success,
.btn-secondary {
    padding: var(--space-md) var(--space-lg);
    font-size: var(--font-size-base);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: bold;
    color: var(--color-text-primary);
    min-width: 140px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.btn-primary {
    background: var(--gradient-primary);
    border: 2px solid rgba(102, 126, 234, 0.5);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
    border-color: rgba(102, 126, 234, 0.8);
}

.btn-primary:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn-success {
    background: var(--gradient-success);
    border: 2px solid rgba(56, 239, 125, 0.5);
}

.btn-success:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(56, 239, 125, 0.6);
    border-color: rgba(56, 239, 125, 0.8);
}

.btn-success:focus-visible {
    outline: 2px solid var(--color-success);
    outline-offset: 2px;
}

.btn-secondary {
    background: var(--gradient-dark);
    border: 2px solid rgba(255, 255, 255, 0.2);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.4);
}

.btn-secondary:focus-visible {
    outline: 2px solid var(--color-text-primary);
    outline-offset: 2px;
}

.preset-buttons {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
}

.preset-btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-sm);
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 500;
    text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.preset-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: scale(1.02);
}

.preset-btn:focus-visible {
    outline: 2px solid var(--color-text-primary);
    outline-offset: 2px;
}

.preset-btn.active {
    background: var(--color-success);
    border-color: var(--color-success);
    box-shadow: 0 3px 8px rgba(76, 175, 80, 0.4);
}

.help-text {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
    text-shadow: 0 1px 2px rgba(0,0,0,0.8);
}

.output-section {
    background: rgba(0, 0, 0, 0.5);
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-top: var(--space-xl);
    box-shadow: var(--shadow-sm);
}

.output-section h2 {
    margin-top: 0;
    color: var(--color-text-primary);
    font-weight: bold;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

#jsonOutput {
    background: #0a0a0a;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    max-height: 400px;
    overflow-y: auto;
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-xs);
    white-space: pre-wrap;
    word-wrap: break-word;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.back-link {
    display: inline-block;
    margin-bottom: var(--space-lg);
    color: var(--color-success);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
}

.back-link:hover {
    text-decoration: underline;
    color: #5ED35A;
}

.back-link:focus-visible {
    outline: 2px solid var(--color-success);
    outline-offset: 2px;
}

/* Editor JSON Output */
.editor-json-output {
    margin-top: var(--space-2xl);
}

.editor-json-note {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-md);
}

.json-editor-textarea {
    width: 100%;
    min-height: 400px;
    background: #0a0a0a;
    border: 1px solid var(--color-border-default);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    font-family: 'Courier New', monospace;
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    line-height: 1.5;
    resize: vertical;
}

.editor-json-buttons {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
    justify-content: flex-end;
}

.json-validation-message {
    margin-top: var(--space-sm);
    font-size: var(--font-size-sm);
}

/* Settings View Specific */
.settings-description {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-lg);
    line-height: 1.6;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
}

.settings-checkbox {
    width: 20px;
    height: 20px;
    margin-right: var(--space-sm);
    cursor: pointer;
    accent-color: var(--color-success);
}

.settings-info-content {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    line-height: 1.8;
}

.settings-info-content p {
    margin: 0 0 var(--space-md) 0;
}

.settings-label {
    color: var(--color-success);
}

.settings-warning {
    color: #FF9800;
    margin-top: var(--space-sm);
}

.settings-message {
    text-align: center;
    margin-top: var(--space-lg);
    font-size: var(--font-size-base);
    opacity: 0;
    transition: opacity var(--transition-base);
}

/* Saved levels list buttons */
.load-level-btn:hover {
    background: #45a049 !important;
    transform: scale(1.05);
}

.delete-level-btn:hover {
    background: #da190b !important;
    transform: scale(1.05);
}

/* ============================================================================
   Animations
   ========================================================================= */
@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Respect user motion preferences */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ============================================================================
   Responsive Breakpoints
   ========================================================================= */

/* Mobile Portrait (320px - 479px) */
@media (max-width: 479px) {
    :root {
        --space-md: 12px;
        --space-lg: 16px;
        --space-xl: 24px;
        --space-2xl: 32px;
    }

    .header-content {
        flex-direction: column;
        gap: var(--space-md);
        padding: var(--space-md);
    }

    .header-nav {
        width: 100%;
        justify-content: space-between;
    }

    .app-title {
        font-size: var(--font-size-base);
    }

    .nav-link {
        padding: var(--space-sm) var(--space-md);
        font-size: var(--font-size-sm);
    }

    #mainDiv {
        top: 120px; /* Account for stacked header */
        padding: 0 var(--space-sm);
    }

    .card-container {
        grid-template-columns: 1fr;
        gap: var(--space-md);
        padding: 0 var(--space-sm);
    }

    .level-card {
        padding: var(--space-lg) var(--space-md);
    }

    .level-card-title {
        font-size: var(--font-size-xl);
    }

    .controls-info {
        padding: var(--space-md);
    }

    .controls-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .login-container,
    .preloader-content {
        padding: var(--space-lg);
    }
}

/* Mobile Landscape (480px - 767px) */
@media (min-width: 480px) and (max-width: 767px) {
    .header-content {
        padding: var(--space-md) var(--space-lg);
    }

    .card-container {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    #mainDiv {
        top: 80px;
    }
}

/* Tablet (768px - 1023px) */
@media (min-width: 768px) and (max-width: 1023px) {
    .card-container {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--space-lg);
    }

    .level-card-title {
        font-size: var(--font-size-xl);
    }

    .controls-grid {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .header-content {
        padding: var(--space-lg) var(--space-2xl);
    }

    #mainDiv {
        padding: 0 var(--space-2xl);
    }

    .card-container {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* Large Desktop (1440px+) */
@media (min-width: 1440px) {
    .header-content,
    .editor-container {
        max-width: 1400px;
    }

    .card-container {
        max-width: 1400px;
    }
}

/* Touch Device Improvements */
@media (hover: none) {
    .form-group input[type="text"],
    .form-group input[type="number"],
    .form-group select {
        padding: var(--space-md);
        font-size: 16px; /* Prevents iOS zoom on focus */
    }

    .btn-primary,
    .btn-success,
    .btn-secondary,
    .level-button,
    .login-button,
    .preloader-button {
        min-height: 44px; /* Minimum touch target size */
        padding: var(--space-md) var(--space-lg);
    }

    .nav-link {
        min-height: 44px;
        display: flex;
        align-items: center;
    }
}