:root {
    /* Colors - Calm, Trust-First Palette */
    --bg-color: #F8FAFC; /* Cool light gray, very neutral */
    --card-bg: #FFFFFF;
    --text-primary: #111827; /* Near black, softer */
    --text-secondary: #6B7280; /* Cool gray */
    --accent-color: #3B82F6; /* Calm, professional blue */
    --accent-light: #EFF6FF; /* Very faint blue for backgrounds */
    --accent-hover: #2563EB;
    --border-color: #E5E7EB;
    --border-hover: #D1D5DB;
    --shadow-soft: 0 10px 40px -10px rgba(0, 0, 0, 0.05); /* Diffuse, premium shadow */
    --shadow-card: 0 4px 6px -1px rgba(0, 0, 0, 0.02), 0 2px 4px -1px rgba(0, 0, 0, 0.02);
    
    /* Spacing & Sizing - Generous Whitespace */
    --radius-lg: 24px;   /* Modern app standard */
    --radius-md: 16px;   /* For pills/buttons */
    --radius-sm: 8px;
    
    --space-xs: 8px;
    --space-sm: 16px;
    --space-md: 24px;
    --space-lg: 32px;
    --space-xl: 48px;
    --space-xxl: 64px;
    
    /* Typography */
    --font-stack: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --font-weight-extra-bold: 800;

    /* Mobile First Constants */
    --min-touch-target: 56px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-stack);
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding-bottom: env(safe-area-inset-bottom);
}

.app-container {
    width: 100%;
    max-width: 480px; /* Constrained for mobile-like feel even on desktop */
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    margin: 0 auto;
}

/* Header */
.app-header {
    text-align: center;
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
    animation: fadeIn 0.8s ease-out;
}

.logo {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-xs);
    color: var(--text-primary);
}

.tagline {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: var(--font-weight-regular);
}

/* Progress Bar - Mandatory & Visible */
.progress-container {
    width: 100%;
    height: 6px; /* Slightly thicker for visibility */
    background-color: #E2E8F0; /* Slightly darker for contrast */
    border-radius: 3px;
    margin-bottom: var(--space-xl);
    overflow: hidden;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.progress-container.active {
    opacity: 1;
}

.progress-bar {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
    transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 3px;
}

/* Main Content Area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    justify-content: flex-start; /* Top-down flow */
    padding-bottom: 100px; /* Space for fixed bottom CTA */
}

/* Input Cards - Mobile Optimized */
.step-card {
    width: 100%;
    opacity: 0;
    transform: translateY(15px) scale(0.98);
    transition: 
        opacity 0.4s cubic-bezier(0.25, 1, 0.5, 1),
        transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    visibility: hidden;
}

.step-card.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    position: relative;
    pointer-events: auto;
    visibility: visible;
}

.step-card.leaving {
    opacity: 0;
    transform: translateY(-10px) scale(0.98);
    position: absolute;
}

.question-title {
    font-size: 1.75rem; /* Larger for quick scanning */
    font-weight: var(--font-weight-extra-bold);
    margin-bottom: var(--space-xl);
    text-align: left; /* Easier reading flow */
    line-height: 1.2;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}

/* Options / Chips - Large Touch Targets */
.options-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md); /* Increased gap */
}

.option-btn {
    appearance: none;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg); /* Larger radius */
    min-height: var(--min-touch-target); /* Minimum 56px height */
    font-size: 1.1rem;
    font-family: var(--font-stack);
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 1, 0.5, 1);
    text-align: left;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-card);
    position: relative;
    overflow: hidden;
}

.option-btn:hover {
    border-color: var(--border-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 16px -4px rgba(0, 0, 0, 0.08);
}

.option-btn:active {
    transform: scale(0.98);
    background-color: var(--bg-color);
}

.option-btn.selected {
    background-color: var(--accent-light);
    border-color: var(--accent-color);
    color: var(--accent-color);
    font-weight: var(--font-weight-medium);
    box-shadow: 0 0 0 2px var(--accent-color);
}

/* Arrow in option */
.option-btn .arrow {
    opacity: 0.5;
    transform: translateX(0);
    transition: all 0.3s ease;
    color: var(--text-secondary);
    font-weight: bold;
}

.option-btn:hover .arrow,
.option-btn.selected .arrow {
    opacity: 1;
    color: var(--accent-color);
    transform: translateX(4px);
}

/* Result View - V1.1 Structure */
.result-view {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    display: none;
    padding-bottom: 120px; /* Space for fixed bottom CTA */
}

.result-view.visible {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

/* 1. Decision Header - Optimized for Unity */
.decision-header {
    text-align: center;
    padding: var(--space-md) 0 var(--space-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    gap: 0; /* Let elements control their own spacing closer */
}

.result-headline {
    font-size: 2.25rem;
    font-weight: 800;
    margin-bottom: var(--space-xs); /* Tight gap to one-liner */
    color: var(--text-primary);
    line-height: 1.1;
    letter-spacing: -0.04em;
    z-index: 2;
}

.one-liner {
    margin-top: 0;
    font-style: italic;
    color: var(--accent-color);
    font-size: 1.5rem;
    font-family: Georgia, "Times New Roman", serif;
    opacity: 1;
    border: none;
    padding: var(--space-sm) var(--space-xs);
    line-height: 1.4;
    text-shadow: 0 4px 20px rgba(59, 130, 246, 0.15);
    font-weight: 500;
    position: relative;
    display: block;
    max-width: 90%;
    margin-left: auto;
    margin-right: auto;
    z-index: 2;
}

/* Quote decoration */
.one-liner::before {
    content: "“";
    font-size: 3rem;
    position: absolute;
    top: -10px;
    left: -20px;
    opacity: 0.2;
    color: var(--accent-color);
    font-family: sans-serif;
}

/* Connective element - The "Bridge" */
.one-liner::after {
    content: "";
    display: block;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent-light), transparent);
    margin: var(--space-md) auto 0;
    border-radius: 2px;
}

/* 2. Action Cards (Eat / Move) - Premium & Shareable */
.action-card {
    background: #FFFFFF;
    border-radius: 28px; /* Slightly more rounded for organic feel */
    padding: 24px; /* Optimized padding */
    box-shadow: 
        0 4px 6px -1px rgba(0, 0, 0, 0.01), 
        0 12px 32px -4px rgba(59, 130, 246, 0.08); /* Colored shadow for premium feel */
    border: 1px solid rgba(255, 255, 255, 0.8);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    position: relative;
    overflow: hidden;
    transition: transform 0.3s ease;
}

/* Subtle gradient overlay for depth */
.action-card::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-light), var(--accent-color), var(--accent-light));
    opacity: 0.6;
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-xs);
}

.action-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--accent-light);
    border-radius: 50%;
    font-size: 1.5rem;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
}

.card-title {
    text-transform: uppercase;
    font-size: 0.85rem;
    font-weight: 800;
    color: var(--accent-color);
    letter-spacing: 0.1em;
}

.card-content ul {
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.card-content li {
    margin-bottom: var(--space-sm);
    padding-left: 0;
    display: flex;
    align-items: flex-start;
    font-size: 1.15rem; /* Slightly larger for readability */
    line-height: 1.6;
    color: var(--text-primary);
    font-weight: 450;
}

.card-content li:last-child {
    margin-bottom: 0;
}

/* Custom bullet */
.card-content li::before {
    content: "";
    min-width: 6px;
    height: 6px;
    background-color: var(--accent-color);
    border-radius: 50%;
    margin-top: 10px; /* Optical center alignment */
    margin-right: 16px;
    box-shadow: 0 0 0 2px var(--accent-light);
}

/* 3. Why Section (De-emphasized) */
.why-section {
    padding: var(--space-md);
    background: transparent;
    border-radius: var(--radius-md);
    margin-top: var(--space-sm);
}

.why-section .section-label {
    color: var(--text-secondary);
    font-size: 0.8rem;
    margin-bottom: var(--space-sm);
    display: block;
    font-weight: 600;
}

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

.why-section li {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: var(--space-xs);
    position: relative;
    padding-left: var(--space-md);
}

.why-section li::before {
    content: "info";
    font-family: "Material Icons", sans-serif; /* Fallback if no icon font */
    content: "i";
    position: absolute;
    left: 0;
    top: 2px;
    font-size: 0.7rem;
    width: 16px;
    height: 16px;
    background: #E5E7EB;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-weight: bold;
}

/* 4. Bottom CTA (Fixed) */
.bottom-cta-container {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--space-xs);
    background: linear-gradient(to top, rgba(248,250,252, 1) 70%, rgba(248,250,252, 0));
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    z-index: 100;
    padding-bottom: max(var(--space-xs), env(safe-area-inset-bottom));
}

.btn-primary {
    background-color: var(--text-primary);
    color: white;
    border: none;
    padding: 16px 32px; /* Taller touch target */
    border-radius: 100px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.2s ease;
    width: 100%;
    max-width: 400px; /* Constrained width */
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary:active {
    transform: scale(0.97);
}

/* Footer */
.app-footer {
    margin-top: auto;
    text-align: center;
    padding-top: var(--space-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.75rem;
    color: #9CA3AF;
    padding-bottom: var(--space-xl); /* Extra padding for scrolling */
}

.hidden {
    display: none !important;
}

.reset-link {
    background: none;
    border: none;
    text-decoration: underline;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    padding: var(--space-xs) var(--space-md); /* Larger hit area */
    opacity: 0.6;
}

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

/* Mobile Optimizations */
@media (max-width: 480px) {
    .app-container {
        padding: var(--space-md);
    }
    .question-title {
        font-size: 1.5rem;
        margin-bottom: var(--space-lg);
    }
    .result-headline {
        font-size: 2rem;
    }
    .option-btn {
        padding: var(--space-md);
    }
}