:root {
    /* Color Palette - Dark Mode Default */
    --bg-color: #121212;
    --text-main: #E0E0E0;
    --text-muted: #A0A0A0;
    --accent-red: #EF5350;
    /* Anger */
    --accent-blue: #42A5F5;
    /* Sadness */
    --accent-green: #66BB6A;
    /* Anxiety */
    --accent-yellow: #FFEE58;
    /* Self-worth */
    --glow-color: rgba(255, 255, 255, 0.1);

    /* Spacing & Layout */
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 64px;

    /* Transition */
    --transition-slow: 0.5s ease-in-out;
    --transition-fast: 0.2s ease-out;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    font-weight: 300;
    line-height: 1.6;
    height: 100vh;
    display: flex;
    justify-content: center;
    overflow: hidden;
    /* Prevent scroll for immersive feel */
}

#app {
    width: 100%;
    max-width: 600px;
    /* Minimal width for focus */
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-md);
    position: relative;
}

/* Header & Footer */
.main-header {
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-bottom: var(--spacing-lg);
}

.logo {
    font-size: 1.2rem;
    font-weight: 400;
    color: var(--text-muted);
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.logo:hover {
    color: var(--text-main);
}

.main-footer {
    text-align: center;
    padding: var(--spacing-md);
    font-size: 0.8rem;
    color: #444;
    margin-top: auto;
}

/* Views & Routing */
.view {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-slow);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding-top: 100px;
    /* Offset for header */
}

.view.active {
    opacity: 1;
    pointer-events: auto;
    position: relative;
    top: auto;
    left: auto;
    height: auto;
    min-height: 50vh;
}

.view.hidden {
    display: none;
}

/* Typography & Text */
h2 {
    font-weight: 300;
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.instruction {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-xl);
}

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

.intro-text p {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-muted);
}

/* Buttons */
button {
    background: none;
    border: 1px solid var(--text-muted);
    color: var(--text-main);
    padding: 12px 24px;
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    border-radius: 4px;
    /* Slightly rounded */
    transition: all var(--transition-fast);
}

button:hover {
    border-color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-btn {
    display: block;
    width: 200px;
    margin: var(--spacing-md) auto;
}

.back-btn {
    margin-top: auto;
    border: none;
    color: #666;
    font-size: 0.8rem;
}

.back-btn:hover {
    color: var(--text-main);
    background: none;
    border: none;
}

/* Dump Zone Specifics */
.dump-canvas {
    flex: 1;
    width: 100%;
    position: relative;
    min-height: 300px;
}

.input-area {
    width: 100%;
    max-width: 400px;
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

#emotion-input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid #444;
    color: var(--text-main);
    font-size: 1.2rem;
    padding: var(--spacing-sm);
    text-align: center;
    font-family: inherit;
    transition: border-color var(--transition-fast);
}

#emotion-input:focus {
    outline: none;
    border-bottom-color: var(--text-main);
}

.category-selectors {
    display: flex;
    gap: var(--spacing-md);
}

.color-btn {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    padding: 0;
    cursor: pointer;
    opacity: 0.5;
    transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.color-btn:hover,
.color-btn.selected {
    transform: scale(1.2);
    opacity: 1;
}

.color-btn.red {
    background-color: var(--accent-red);
}

.color-btn.blue {
    background-color: var(--accent-blue);
}

.color-btn.green {
    background-color: var(--accent-green);
}

.color-btn.yellow {
    background-color: var(--accent-yellow);
}

/* Floating Text Animation */
.floating-text {
    position: absolute;
    cursor: pointer;
    user-select: none;
    transition: opacity 1s ease-out, filter 1s ease-out;
}

.floating-text.dissolving {
    opacity: 0;
    filter: blur(8px);
    transform: scale(1.1);
}

/* Restore Zone Specifics */
.affirmation-container {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.affirmation-card {
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 1s ease;
    text-align: center;
    color: var(--text-muted);
}

.affirmation-card:hover {
    color: var(--text-main);
}

.affirmation-card.active {
    color: var(--text-main);
    text-shadow: 0 0 10px var(--glow-color);
    transform: scale(1.05);
}

.text-btn {
    border: none;
    color: #444;
    font-size: 0.8rem;
    margin-top: var(--spacing-md);
}

.text-btn:hover {
    color: var(--text-muted);
    background: transparent;
    border: none;
}

/* Keyframes */
@keyframes float {
    from {
        transform: translateY(0);
    }

    to {
        transform: translateY(-20px);
    }

    /* Alternate is handled in JS/Animation property, 
       but for pure CSS float, we often use 0% -> 50% -> 100% */
}