/* Farbcode-Knacker X - Kompaktes Responsive Design */

/* === GLOBALE VARIABLEN === */
:root {
    /* Hauptfarben */
    --primary-color: #6366f1;
    --primary-hover: #5b21b6;
    --secondary-color: #10b981;
    --accent-color: #f59e0b;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    
    /* Neutrale Farben */
    --background: #f8fafc;
    --surface: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --border: #e5e7eb;
    --border-focus: #6366f1;
    
    /* Shadows mit Safari-Kompatibilität */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 0.75rem;
    --space-lg: 1rem;
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-normal: 0.3s ease-out;
}

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

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

/* === KOMPAKTER HEADER === */
.app-header-compact {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    padding: var(--space-lg) 0;
    box-shadow: var(--shadow-lg);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

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

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

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

.title-group h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.subtitle {
    font-size: 0.875rem;
    opacity: 0.9;
    margin: 0;
}

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

.header-stats {
    display: flex;
    gap: var(--space-lg);
}

.quick-stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.75rem;
    opacity: 0.8;
}

.settings-toggle-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.875rem;
    font-weight: 500;
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.settings-toggle-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

/* === HAUPTLAYOUT === */
.app-main-compact {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

/* === SCHNELLSTART HORIZONTAL === */
.quick-start-section {
    background: var(--surface);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
}

.quick-start-section h3 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-lg);
    font-size: 1.125rem;
    font-weight: 600;
}

.quick-buttons-horizontal {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--space-md);
}

.quick-btn {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-lg);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    background: var(--background);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: left;
    min-height: 80px;
}

.quick-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.quick-btn.beginner:hover {
    border-color: var(--secondary-color);
    background: rgba(16, 185, 129, 0.05);
}

.quick-btn.standard:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
}

.quick-btn.challenge:hover {
    border-color: var(--accent-color);
    background: rgba(245, 158, 11, 0.05);
}

.btn-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.btn-content {
    flex: 1;
}

.btn-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.btn-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* === HAUPTSPIELBREICH === */
.game-container-main {
    display: flex;
    flex-direction: column;
    gap: var(--space-xl);
}

/* === KOMPAKTER STATUS === */
.game-status-compact {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.status-left {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.status-icon {
    font-size: 1.25rem;
}

.status-text {
    font-weight: 500;
}

.status-right {
    display: flex;
    flex-direction: column;
    text-align: right;
    gap: var(--space-xs);
}

.status-item {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* === STATUS-NACHRICHTEN === */
.status-message-container {
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.status-message {
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-weight: 500;
    text-align: center;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md);
}

.status-message.win {
    background: rgba(16, 185, 129, 0.1);
    color: var(--secondary-color);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.status-message.lose {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.status-message.info {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

/* === SPIELFELD GRID === */
.game-board-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-xl);
}

.game-column-left,
.game-column-right {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

/* === KOMPAKTE SEKTIONEN === */
.code-section,
.symbol-palette-section,
.attempts-section-compact {
    background: var(--surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    overflow: hidden;
}

.section-header-compact {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-lg);
    border-bottom: 1px solid var(--border);
    background: var(--background);
}

.section-header-compact h3 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1rem;
    font-weight: 600;
    margin: 0;
}

.guess-progress {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.palette-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* === CODE DISPLAY === */
.code-display {
    padding: var(--space-lg);
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.code-slot {
    width: 50px;
    height: 50px;
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    background: var(--surface);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.code-slot:hover {
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

.code-slot.selected {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.05);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.current-guess .code-slot {
    border-style: dashed;
}

.current-guess .code-slot.filled {
    border-style: solid;
    background: rgba(16, 185, 129, 0.05);
    border-color: var(--secondary-color);
}

/* === SYMBOL PALETTE === */
.modern-palette {
    padding: var(--space-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
    gap: var(--space-sm);
}

.symbol-btn {
    width: 40px;
    height: 40px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
}

.symbol-btn:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

/* === KOMPAKTE STEUERUNG === */
.game-controls-compact {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    display: flex;
    gap: var(--space-md);
}

.control-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    flex: 1;
}

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

.control-btn.primary:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.control-btn.primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.secondary-controls {
    display: flex;
    gap: var(--space-sm);
}

.control-btn.secondary {
    background: var(--background);
    color: var(--text-primary);
    border-color: var(--border);
    flex: none;
    padding: var(--space-md);
}

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

.control-btn.danger:hover {
    border-color: var(--danger-color);
    color: var(--danger-color);
}

/* === VERSUCHE HISTORIE === */
.attempts-container {
    padding: var(--space-lg);
    max-height: 300px;
    overflow-y: auto;
}

.no-attempts {
    text-align: center;
    padding: var(--space-xl);
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 2rem;
    margin-bottom: var(--space-sm);
}

.attempt-row {
    display: flex;
    align-items: center;
    gap: var(--space-lg);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--border);
}

.attempt-row:last-child {
    border-bottom: none;
}

.attempt-number {
    font-weight: 600;
    color: var(--text-secondary);
    min-width: 2rem;
}

.attempt-guess {
    display: flex;
    gap: var(--space-sm);
}

.attempt-guess .code-slot {
    width: 35px;
    height: 35px;
    font-size: 0.875rem;
}

.attempt-feedback {
    display: flex;
    gap: var(--space-xs);
    margin-left: auto;
}

.feedback-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 1px solid var(--border);
}

.feedback-dot.correct {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
}

.feedback-dot.wrong-position {
    background: var(--accent-color);
    border-color: var(--accent-color);
}

.feedback-dot.wrong {
    background: var(--danger-color);
    border-color: var(--danger-color);
}

/* === EINSTELLUNGS-PANEL === */
.settings-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--surface);
    box-shadow: var(--shadow-lg);
    transition: right var(--transition-normal);
    z-index: 1000;
    overflow-y: auto;
}

.settings-panel.open {
    right: 0;
}

.settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.settings-overlay.active {
    opacity: 1;
    visibility: visible;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl);
    border-bottom: 1px solid var(--border);
    background: var(--background);
}

.settings-header h3 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin: 0;
}

.close-settings {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--danger-color);
    color: white;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.settings-content {
    padding: var(--space-xl);
}

/* === EINSTELLUNGSGRUPPEN === */
.setting-group {
    margin-bottom: var(--space-lg);
}

.setting-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.label-icon {
    font-size: 1rem;
}

/* === MODERNE EINGABEFELDER === */
.modern-select {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: border-color var(--transition-fast);
    -webkit-appearance: none;
    appearance: none;
}

.modern-select:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* === RANGE-INPUTS === */
.range-input-container {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.modern-range {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--border);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.modern-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.modern-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-sm);
}

.range-value {
    background: var(--primary-color);
    color: white;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    min-width: 2rem;
    text-align: center;
}

/* === TOGGLE-SCHALTER === */
.toggle-settings {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.toggle-label {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    cursor: pointer;
    font-size: 0.875rem;
}

.toggle-label input[type="checkbox"] {
    display: none;
}

.toggle-slider {
    position: relative;
    width: 44px;
    height: 24px;
    background: var(--border);
    border-radius: 12px;
    transition: background-color var(--transition-normal);
}

.toggle-slider:before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background: white;
    border-radius: 50%;
    transition: transform var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.toggle-label input:checked + .toggle-slider {
    background: var(--primary-color);
}

.toggle-label input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

/* === EXPERIENCE SETTINGS === */
.experience-settings h4 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* === SETTINGS ACTIONS === */
.settings-actions {
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border);
}

.primary-action-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin-bottom: var(--space-md);
}

.primary-action-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.secondary-action-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-md);
    background: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

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

/* === GEHEIMER CODE === */
.secret-section {
    display: none;
}

.secret-section.revealed {
    display: block;
    animation: fadeIn 0.5s ease-out;
}

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

/* === MODALS === */
.modern-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.modal-container {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    max-width: 90vw;
    max-height: 90vh;
    overflow: hidden;
    animation: modalSlideIn 0.3s ease-out;
}

@keyframes modalSlideIn {
    from {
        opacity: 0;
        transform: scale(0.9) translateY(20px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-xl);
    border-bottom: 1px solid var(--border);
    background: var(--background);
}

.modal-header h2 {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.modal-close {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--background);
    color: var(--text-muted);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--danger-color);
    color: white;
}

.modal-content {
    padding: var(--space-xl);
    overflow-y: auto;
    max-height: calc(90vh - 120px);
}

/* === HILFE-GRID === */
.help-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-xl);
}

.help-card {
    padding: var(--space-xl);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--background);
}

.help-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
}

.help-card h3 {
    margin-bottom: var(--space-md);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.feedback-examples,
.controls-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.feedback-row,
.control-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm);
    background: var(--surface);
    border-radius: var(--radius-sm);
}

kbd {
    background: var(--text-primary);
    color: var(--surface);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 0.75rem;
    font-weight: 600;
}

/* === TUTORIAL === */
.tutorial-modal .modal-container {
    width: 600px;
}

.tutorial-navigation {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-xl);
    padding-top: var(--space-xl);
    border-top: 1px solid var(--border);
}

.tutorial-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

.tutorial-btn.secondary {
    background: var(--background);
    color: var(--text-primary);
    border-color: var(--border);
}

.tutorial-btn:hover {
    transform: translateY(-1px);
}

.progress-dots {
    display: flex;
    gap: var(--space-sm);
}

.progress-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border);
    transition: background-color var(--transition-fast);
}

.progress-dot.active {
    background: var(--primary-color);
}

/* === TOAST-BENACHRICHTIGUNGEN === */
.toast-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    background: var(--surface);
    color: var(--text-primary);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--primary-color);
    max-width: 400px;
    animation: toastSlideIn 0.3s ease-out;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    border-left-color: var(--secondary-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

/* === LOADING-OVERLAY === */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.9);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-spinner {
    text-align: center;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--space-md);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* === RESPONSIVE DESIGN === */
@media (max-width: 1024px) {
    .game-board-grid {
        grid-template-columns: 1fr;
    }
    
    .game-column-right {
        order: -1;
    }
    
    .attempts-container {
        max-height: 200px;
    }
}

@media (max-width: 768px) {
    .app-main-compact {
        padding: var(--space-md);
        gap: var(--space-lg);
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .quick-buttons-horizontal {
        grid-template-columns: 1fr;
    }
    
    .game-status-compact {
        flex-direction: column;
        gap: var(--space-md);
        text-align: center;
    }
    
    .status-right {
        text-align: center;
    }
    
    .game-controls-compact {
        flex-direction: column;
    }
    
    .secondary-controls {
        justify-content: center;
    }
    
    .settings-panel {
        width: 100%;
        right: -100%;
    }
    
    .code-slot {
        width: 45px;
        height: 45px;
        font-size: 1.125rem;
    }
    
    .symbol-btn {
        width: 35px;
        height: 35px;
        font-size: 0.875rem;
    }
    
    .help-grid {
        grid-template-columns: 1fr;
    }
    
    .secondary-actions {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .app-main-compact {
        padding: var(--space-sm);
    }
    
    .code-display {
        gap: var(--space-xs);
    }
    
    .code-slot {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .modern-palette {
        grid-template-columns: repeat(6, 1fr);
        gap: var(--space-xs);
    }
    
    .symbol-btn {
        width: 32px;
        height: 32px;
        font-size: 0.75rem;
    }
    
    .modal-container {
        margin: var(--space-md);
        max-width: calc(100vw - 2rem);
    }
}

/* === ACCESSIBILITY === */
*:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

button:focus,
select:focus,
input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

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

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* === PRINT STYLES === */
@media print {
    .settings-panel,
    .game-controls-compact,
    .modern-modal {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
    
    .game-board-grid {
        break-inside: avoid;
    }
}