/* ===========================
   CSS Variables
   =========================== */
:root {
    /* Colors */
    --primary-color: #4CAF50;
    --primary-hover: #45a049;
    --secondary-color: #2196F3;
    --secondary-hover: #0b7dda;
    --background: #ffffff;
    --text-bg: #f7f7f7;
    --text-color: #333333;
    --border-color: #dddddd;
    --error-color: #f44336;
    --warning-color: #ff9800;
    --success-color: #4CAF50;
    --info-color: #808000;
    --disabled-color: #cccccc;

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

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'Courier New', Courier, monospace;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.5rem;
    --font-size-xxl: 2rem;

    /* Borders */
    --border-radius: 8px;
    --border-radius-sm: 6px;

    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-medium: 300ms ease-out;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--text-color);
    background-color: var(--background);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===========================
   Utility Classes
   =========================== */
.hidden {
    display: none !important;
}

/* ===========================
   API Key Section
   =========================== */
.api-key-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.api-key-content {
    background: var(--background);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    max-width: 500px;
    width: 100%;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.api-key-content h2 {
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
    font-size: var(--font-size-xl);
}

.api-key-content p {
    margin-bottom: var(--spacing-md);
    color: #666;
}

#api-key-input {
    width: 100%;
    padding: 12px;
    margin-bottom: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
    font-family: var(--font-family-mono);
}

#api-key-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.api-key-note {
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: #888;
}

/* ===========================
   App Container
   =========================== */
#app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* ===========================
   Header
   =========================== */
.app-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
}

.app-header h1 {
    font-size: var(--font-size-xxl);
    margin-bottom: var(--spacing-xs);
    font-weight: 700;
}

.subtitle {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

/* Mode Selector */
.mode-selector {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
}

.mode-btn {
    padding: 12px 24px;
    border: 2px solid white;
    background: transparent;
    color: white;
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 44px;
}

.mode-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.mode-btn.active {
    background: white;
    color: #667eea;
}

/* ===========================
   Main Content
   =========================== */
.main-content {
    flex: 1;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    position: relative;
}

/* ===========================
   Text Display
   =========================== */
.text-display {
    margin-bottom: var(--spacing-lg);
}

.current-text {
    background: var(--text-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-family: Georgia, 'Times New Roman', serif;
    font-size: var(--font-size-lg);
    line-height: 1.8;
    min-height: 100px;
    color: var(--text-color);
    white-space: pre-wrap;
}

.current-text:empty::before {
    content: 'Click "Start Game" to begin...';
    color: #999;
    font-style: italic;
}

/* ===========================
   Interaction Area
   =========================== */
.interaction-area {
    margin-bottom: var(--spacing-lg);
}

/* Start Controls */
.start-controls {
    text-align: center;
}

/* Mode 1: Token Buttons */
.token-buttons {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

@media (min-width: 600px) {
    .token-buttons {
        grid-template-columns: 1fr 1fr;
    }
}

.token-btn {
    padding: 16px 20px;
    border: 2px solid var(--border-color);
    background: white;
    color: var(--text-color);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-lg);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 60px;
    word-wrap: break-word;
}

.token-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    background: rgba(76, 175, 80, 0.05);
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.token-btn:active:not(:disabled) {
    transform: translateY(0);
}

.token-btn:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

.token-btn.correct {
    background: var(--success-color);
    color: white;
    border-color: var(--success-color);
}

.token-btn.incorrect {
    background: var(--error-color);
    color: white;
    border-color: var(--error-color);
}

.token-btn.revealed {
    background: #f0f0f0;
    border-color: #ccc;
}

/* Mode 2: Nudge Input */
.story-goal,
.story-reaction {
    background: var(--text-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.story-goal span,
.story-reaction strong {
    display: block;
    font-weight: 700;
    color: var(--text-color);
}

.story-goal strong {
    display: block;
    margin: 4px 0;
    color: var(--primary-color);
    font-size: var(--font-size-xl);
    text-transform: capitalize;
}

.story-goal p,
.story-reaction p {
    margin: 4px 0 0;
}

.story-reaction {
    border-left: 4px solid var(--primary-color);
    margin-top: var(--spacing-md);
}

.story-ideas {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 4px 0 var(--spacing-sm);
}

.story-idea {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 999px;
    padding: 6px 10px;
    cursor: pointer;
    color: var(--text-color);
}

.story-idea:hover:not(:disabled) {
    border-color: var(--primary-color);
}

.nudge-input-container {
    background: var(--text-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.nudge-input-container label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-color);
}

#nudge-input {
    width: 100%;
    padding: 12px;
    margin-bottom: var(--spacing-xs);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
}

#nudge-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

/* Word Counter */
.word-counter {
    text-align: right;
    font-size: var(--font-size-sm);
    color: #666;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

.word-counter.over-limit {
    color: var(--error-color);
    font-weight: 700;
}

.word-counter #word-count {
    font-weight: 700;
    font-size: var(--font-size-base);
}

.turn-counter {
    text-align: center;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-color);
    padding: var(--spacing-sm);
}

/* ===========================
   Buttons
   =========================== */
.primary-btn {
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    min-height: 44px;
}

.primary-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.primary-btn:active:not(:disabled) {
    transform: translateY(0);
}

.primary-btn:disabled {
    background: var(--disabled-color);
    cursor: not-allowed;
}

.secondary-btn {
    background: #6c757d;
    color: white;
    border: none;
    padding: 10px 20px;
    font-size: var(--font-size-md);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background 0.2s ease;
}

.secondary-btn:hover:not(:disabled) {
    background: #5a6268;
}

.secondary-btn:active:not(:disabled) {
    background: #545b62;
}

.secondary-btn:disabled {
    background: var(--disabled-color);
    cursor: not-allowed;
}

.large-btn {
    padding: 16px 32px;
    font-size: var(--font-size-lg);
}

.text-btn {
    background: none;
    border: none;
    color: var(--secondary-color);
    text-decoration: underline;
    cursor: pointer;
    font-size: var(--font-size-sm);
    padding: var(--spacing-xs);
}

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

/* ===========================
   Feedback Area
   =========================== */
.feedback-area {
    margin-bottom: var(--spacing-lg);
}

/* Probability Table (Mode 1) */
.probability-display {
    background: var(--text-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.probability-display h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

.probability-explanation {
    margin: 0 0 var(--spacing-sm);
    color: #555;
    font-size: var(--font-size-sm);
}

.probability-table {
    width: 100%;
    border-collapse: collapse;
    font-family: var(--font-family-mono);
}

.probability-table th,
.probability-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.probability-table th {
    background: #e0e0e0;
    font-weight: 600;
    color: var(--text-color);
}

.probability-table td {
    color: #555;
}

.probability-table tr:last-child td {
    border-bottom: none;
}

/* Probability Meter (Mode 2) - Visual Feedback System */
.probability-meter-container {
    background: var(--text-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
}

.probability-meter-container h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-color);
}

/* Trajectory Sparkline Chart */
.trajectory-sparkline {
    width: 100%;
    height: 120px;
    margin-bottom: var(--spacing-md);
    background: white;
    border-radius: var(--border-radius-sm);
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
}

.trajectory-svg {
    width: 100%;
    height: 100%;
    display: block;
}

.target-line {
    stroke: #999;
    stroke-width: 1;
    opacity: 0.5;
}

.trajectory-path {
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    transition: stroke var(--transition-medium);
}

.trajectory-area {
    opacity: 0.1;
    transition: fill var(--transition-medium);
}

.trajectory-point {
    r: 4;
    stroke: white;
    stroke-width: 2;
    transition: all var(--transition-fast);
}

.trajectory-point:hover {
    r: 6;
}

/* Color-Coded Path Segments */
.path-container {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.path-segments {
    display: flex;
    gap: var(--spacing-xs);
    flex: 1;
    min-width: 0;
    flex-wrap: wrap;
}

.path-segment {
    height: 50px;
    min-width: 50px;
    flex: 1;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-sm);
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    position: relative;
    cursor: pointer;
    transition: all var(--transition-medium);
    animation: segmentAppear var(--transition-medium) ease-out;
}

@keyframes segmentAppear {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.path-segment:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.path-segment.glow {
    animation: glowPulse 1s ease-out;
}

@keyframes glowPulse {
    0%, 100% {
        box-shadow: 0 0 0 rgba(76, 175, 80, 0);
    }
    50% {
        box-shadow: 0 0 20px rgba(76, 175, 80, 0.6);
    }
}

.path-segment.shake {
    animation: shake 0.5s ease-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* Color scale based on probability ranges */
.path-segment[data-range="0-20"] {
    background: linear-gradient(135deg, #E53935, #C62828);
}

.path-segment[data-range="21-40"] {
    background: linear-gradient(135deg, #FF9800, #F57C00);
}

.path-segment[data-range="41-60"] {
    background: linear-gradient(135deg, #FFC107, #FFA000);
}

.path-segment[data-range="61-80"] {
    background: linear-gradient(135deg, #8BC34A, #7CB342);
}

.path-segment[data-range="81-100"] {
    background: linear-gradient(135deg, #4CAF50, #388E3C);
}

.path-segment-label {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    color: var(--text-color);
    white-space: nowrap;
}

/* Remaining Turns Indicator */
.remaining-turns {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.remaining-turn-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--border-color);
    border: 2px solid #999;
    transition: all var(--transition-fast);
}

/* Probability Status and Feedback Indicator */
.probability-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    flex-wrap: wrap;
}

.probability-current-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-color);
}

.feedback-indicator {
    font-size: 1.5rem;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    animation: indicatorAppear 150ms ease-out;
}

@keyframes indicatorAppear {
    from {
        opacity: 0;
        transform: scale(0.5);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.feedback-indicator.fade-out {
    animation: indicatorFadeOut 300ms ease-out forwards;
    animation-delay: 1.5s;
}

@keyframes indicatorFadeOut {
    to {
        opacity: 0;
        transform: scale(0.8);
    }
}

.feedback-indicator.strong-increase {
    color: #4CAF50;
    animation: pulse 0.3s ease-out;
}

.feedback-indicator.small-increase {
    color: #8BC34A;
}

.feedback-indicator.neutral {
    color: #999;
}

.feedback-indicator.small-decrease {
    color: #FF9800;
}

.feedback-indicator.strong-decrease {
    color: #E53935;
    animation: pulse 0.3s ease-out;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.2);
    }
}

/* Journey Summary Stats (End Screen) */
.journey-summary {
    background: var(--text-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    margin-bottom: var(--spacing-md);
}

.journey-summary h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.journey-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.journey-stat {
    text-align: center;
    padding: var(--spacing-sm);
    background: white;
    border-radius: var(--border-radius-sm);
}

.journey-stat-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.journey-stat-label {
    font-size: var(--font-size-sm);
    color: #666;
    margin-top: var(--spacing-xs);
}

.journey-path-display {
    margin-top: var(--spacing-md);
}

/* AI Analysis Section */
.ai-analysis-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.ai-analysis-section h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-xl);
}

.ai-analysis-content {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    line-height: 1.8;
    color: var(--text-color);
}

.ai-analysis-content p {
    margin-bottom: var(--spacing-md);
}

.ai-analysis-content strong {
    color: var(--primary-color);
    font-weight: 700;
}

/* Loading Analysis Spinner */
.loading-analysis {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    gap: var(--spacing-md);
}

.spinner-small {
    width: 32px;
    height: 32px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.loading-analysis p {
    color: #666;
    font-size: var(--font-size-base);
    font-weight: 500;
}

/* Feedback Messages */
.feedback-message {
    padding: var(--spacing-md);
    border-radius: var(--border-radius-sm);
    text-align: center;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    min-height: 50px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.feedback-message:empty {
    display: none;
}

.feedback-text {
    flex: 1;
    min-width: 200px;
}

.feedback-dismiss-btn {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.9);
    border: 2px solid currentColor;
    border-radius: var(--border-radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: inherit;
    min-height: 36px;
    white-space: nowrap;
}

.feedback-dismiss-btn:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.feedback-dismiss-btn:active {
    transform: translateY(0);
}

.feedback-message.success {
    background: rgba(76, 175, 80, 0.1);
    color: var(--success-color);
    border: 2px solid var(--success-color);
}

.feedback-message.error {
    background: rgba(244, 67, 54, 0.1);
    color: var(--error-color);
    border: 2px solid var(--error-color);
}

.feedback-message.info {
    background: rgba(128, 128, 0, 0.1);
    color: var(--info-color);
    border: 2px solid var(--info-color);
}

.feedback-message.neutral {
    background: rgba(150, 150, 150, 0.1);
    color: #666;
    border: 2px solid #999;
}

/* Score and Round Display */
.score-display,
.round-display {
    text-align: center;
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-color);
    padding: var(--spacing-sm);
}

/* ===========================
   End Screen
   =========================== */
.end-screen {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: var(--spacing-md);
}

.end-screen-content {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
}

.end-screen-content h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-color);
    font-size: var(--font-size-xxl);
    text-align: center;
}

#end-results {
    margin-bottom: var(--spacing-lg);
}

.end-results-section {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--text-bg);
    border-radius: var(--border-radius-sm);
}

.end-results-section h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-color);
}

.end-results-section p {
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.end-screen-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.end-screen-buttons button {
    flex: 1;
    min-width: 150px;
}

@media (max-width: 480px) {
    .end-screen-buttons {
        flex-direction: column;
    }

    .end-screen-buttons button {
        width: 100%;
    }
}

/* ===========================
   Journey Summary Modal
   =========================== */
.summary-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1002;
    padding: var(--spacing-md);
}

.summary-modal-content {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    max-width: 700px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    position: relative;
}

.summary-modal-content h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    font-size: var(--font-size-xxl);
    text-align: center;
}

.close-modal-btn {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: none;
    border: none;
    font-size: 2rem;
    line-height: 1;
    color: #999;
    cursor: pointer;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

.close-modal-btn:hover {
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-color);
}

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

/* ===========================
   Introduction Modal
   =========================== */
.intro-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1001;
    padding: var(--spacing-md);
}

.intro-modal-content {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--border-radius);
    max-width: 550px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
}

.intro-modal-content h2 {
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    font-size: var(--font-size-xxl);
    text-align: center;
}

#intro-text {
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    font-size: 1.1rem;
    color: var(--text-color);
}

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

#dismiss-intro-btn {
    display: block;
    margin: 0 auto;
}

/* ===========================
   Loading Overlay
   =========================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
}

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

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

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

.loading-spinner p {
    font-size: var(--font-size-lg);
    color: var(--text-color);
    font-weight: 600;
}

/* ===========================
   Footer
   =========================== */
.app-footer {
    background: #f5f5f5;
    padding: var(--spacing-md);
    text-align: center;
    color: #666;
    font-size: var(--font-size-sm);
    border-top: 1px solid var(--border-color);
}

.app-footer p {
    margin-bottom: var(--spacing-sm);
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 767px) {
    /* Mobile: Stack path segments vertically */
    .path-segments {
        flex-direction: column;
    }

    .path-segment {
        width: 100%;
        min-width: 100%;
    }

    /* Mobile: Smaller trajectory chart */
    .trajectory-sparkline {
        height: 80px;
    }

    /* Mobile: Wrap remaining turns */
    .remaining-turns {
        flex-wrap: wrap;
    }

    .remaining-turn-dot {
        width: 16px;
        height: 16px;
    }

    /* Mobile: Stack journey stats */
    .journey-stats {
        grid-template-columns: 1fr;
    }

    /* Mobile: Smaller path segments in end screen */
    .journey-path-display .path-segments {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .journey-path-display .path-segment {
        min-width: 60px;
        width: auto;
        flex: 0 1 auto;
    }

    /* Mobile: Adjust probability status */
    .probability-status {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .probability-current-text {
        font-size: var(--font-size-base);
    }
}

@media (min-width: 768px) {
    .main-content {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .current-text {
        font-size: var(--font-size-xl);
    }

    .probability-table {
        font-size: var(--font-size-lg);
    }

    /* Desktop: Better path segment layout */
    .path-segment {
        max-width: 80px;
    }
}

/* ===========================
   Accessibility
   =========================== */
button:focus,
input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}