:root {
    /* Color Palette */
    --royal-ink: #1A1A1B;
    --silk-white: #F8F4EF;
    --joseon-gold: #D4AF37;
    --cinnabar-red: #BC3F32;
    --paper-texture: rgba(248, 244, 239, 0.95);
    
    /* Typography */
    --font-heading: 'Song Myung', serif;
    --font-body: 'Nanum Gothic', sans-serif;
    
    /* Spacing & Effects */
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --shadow-soft: 0 4px 12px rgba(0,0,0,0.1);
    --transition-smooth: all 0.3s ease;
}

@import url('https://fonts.googleapis.com/css2?family=Song+Myung&family=Nanum+Gothic:wght@400;700&display=swap');

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

body {
    background-color: var(--royal-ink);
    color: var(--royal-ink);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--silk-white);
    max-width: 600px;
    margin: 0 auto;
    box-shadow: 0 0 50px rgba(0,0,0,0.5);
}

.app-header {
    background-color: var(--royal-ink);
    color: var(--silk-white);
    padding: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid var(--joseon-gold);
}

.logo {
    font-family: var(--font-heading);
    letter-spacing: 2px;
}

.main-nav {
    display: flex;
    align-items: center;
}

.main-nav button {
    background: transparent;
    border: 1px solid var(--joseon-gold);
    color: var(--joseon-gold);
    padding: 4px 12px;
    cursor: pointer;
    font-family: var(--font-heading);
    margin-left: var(--spacing-sm);
    transition: var(--transition-smooth);
}

.main-nav button:hover, .main-nav button.active {
    background: var(--joseon-gold);
    color: var(--royal-ink);
}

.lang-btn {
    padding: 2px 8px !important;
    font-size: 0.8rem;
    border-radius: 4px;
}

.nav-divider {
    color: var(--joseon-gold);
    margin-left: var(--spacing-sm);
    opacity: 0.5;
}

#content-area {
    flex: 1;
    padding: var(--spacing-lg);
    display: flex;
    justify-content: center;
    align-items: center;
}

.welcome-screen {
    text-align: center;
    animation: fadeIn 1s ease-out;
}

.welcome-screen h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--cinnabar-red);
}

.primary-btn {
    margin-top: var(--spacing-lg);
    background-color: var(--cinnabar-red);
    color: var(--silk-white);
    border: none;
    padding: 12px 24px;
    font-size: 1.1rem;
    font-family: var(--font-heading);
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-soft);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(188, 63, 50, 0.4);
}

.app-footer {
    padding: var(--spacing-md);
    text-align: center;
    font-size: 0.8rem;
    color: #888;
    background: var(--paper-texture);
}

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

/* Glassmorphism & Premium UI */
.story-card {
    width: 100%;
    min-height: 400px;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(212, 175, 55, 0.3);
    padding: var(--spacing-lg);
    border-radius: 12px;
    position: relative;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.story-card h3 {
    font-family: var(--font-heading);
    color: var(--cinnabar-red);
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    border-bottom: 2px dashed var(--joseon-gold);
    display: inline-block;
}

.narrative {
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--royal-ink);
    margin-bottom: var(--spacing-lg);
}

.pm-insight-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(26, 26, 27, 0.98), rgba(40, 40, 42, 0.95));
    color: var(--silk-white);
    padding: var(--spacing-lg);
    display: none;
    border-radius: 12px;
    flex-direction: column;
    justify-content: center;
    border: 2px solid var(--joseon-gold);
    z-index: 10;
}

.pm-insight-layer h4 {
    color: var(--joseon-gold);
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.close-layer-btn {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(212, 175, 55, 0.5); /* joseon-gold */
    border-radius: 50%;
    color: var(--silk-white);
    cursor: pointer;
    width: 44px;
    height: 44px;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.close-layer-btn:hover {
    background: var(--joseon-gold);
    color: var(--royal-ink);
    transform: scale(1.1);
}

.pm-tag {
    display: inline-block;
    background: var(--joseon-gold);
    color: var(--royal-ink);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-top: var(--spacing-md);
}

.controls {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.secondary-btn {
    background: transparent;
    border: 2px solid var(--joseon-gold);
    color: var(--joseon-gold);
    padding: 10px 20px;
    font-family: var(--font-heading);
    cursor: pointer;
    border-radius: 4px;
    transition: var(--transition-smooth);
}

.secondary-btn:hover {
    background: rgba(212, 175, 55, 0.1);
}

.secondary-btn.playing {
    background: var(--joseon-gold);
    color: var(--royal-ink);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pm-insight-layer.active {
    display: flex;
}

/* Hero Card Reward Styling */
.completion-screen {
    text-align: center;
    animation: fadeIn 1s ease-out;
}

.hero-reward {
    margin-top: var(--spacing-lg);
    background: white;
    padding: var(--spacing-lg);
    border-radius: 12px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    border: 3px solid var(--joseon-gold);
}

.hero-reward img {
    max-width: 100%;
    border-radius: 8px;
    margin: var(--spacing-md) 0;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.hero-reward h3 {
    font-family: var(--font-heading);
    color: var(--royal-ink);
}

/* Animations */
.story-card.animated {
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(50px); }
    to { opacity: 1; transform: translateX(0); }
}

/* Timeline/Collection Views */
.timeline-board, .collection-grid {
    width: 100%;
    display: grid;
    gap: var(--spacing-md);
    animation: fadeIn 0.5s ease-out;
}

.timeline-item, .collection-item {
    background: white;
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--joseon-gold);
    cursor: pointer;
    transition: var(--transition-smooth);
}

.timeline-item:hover, .collection-item:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-soft);
}

/* Base button resets for functional buttons */
.timeline-item, .collection-item {
    text-align: left;
    display: block;
    width: 100%;
    color: inherit;
    font-family: inherit;
    font-size: inherit;
    background: white;
    border: none;
    border-left: 4px solid var(--joseon-gold);
    outline: none;
}

/* Fix for nested elements stealing clicks in embedded webviews */
.timeline-item *, .collection-item * {
    pointer-events: none;
}

/* Controls & Icon Button */
.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px 12px;
}

.icon-btn svg {
    width: 24px;
    height: 24px;
}

/* Mobile Responsive Adjustments */
@media (max-width: 480px) {
    .app-header {
        flex-direction: column;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm);
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .main-nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .main-nav button {
        font-size: 0.85rem;
        padding: 4px 8px;
        margin: 0 4px;
    }
    
    .nav-divider {
        display: none;
    }
    
    .controls {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-sm);
    }
    
    .controls > * {
        flex: 1 1 40%;
        text-align: center;
    }
    
    #next-step {
        flex: 1 1 100%; /* Next button gets full width on mobile */
    }
    
    .story-card {
        min-height: auto;
        padding: var(--spacing-md);
    }
    
    .story-card h3 {
        font-size: 1.4rem;
    }
    
    .narrative {
        font-size: 1.1rem;
    }
}