:root {
    --day-bg-1: #FFD700;
    --day-bg-2: #FF69B4;
    --day-card: rgba(255, 255, 255, 0.9);
    --day-text: #333;
    --day-accent: #8A2BE2;
    --day-pink: #FF69B4;
    
    --night-bg-1: #3A005C;
    --night-bg-2: #5C007A;
    --night-card: rgba(0, 0, 0, 0.7);
    --night-text: #F0F0F0;
    --night-accent: #00FFFF;
    --night-pink: #FF00FF;
}

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

body {
    font-family: 'Poppins', sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
}

.app-container {
    min-height: 100vh;
    transition: background 0.5s ease;
    position: relative;
}

.day-mode {
    background: linear-gradient(135deg, var(--day-bg-1) 0%, var(--day-bg-2) 100%);
    color: var(--day-text);
}

.night-mode {
    background: linear-gradient(135deg, var(--night-bg-1) 0%, var(--night-bg-2) 100%);
    color: var(--night-text);
}

/* Sparkle Field */
.sparkle-field {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.sparkle {
    position: absolute;
    width: 6px;
    height: 6px;
    background: white;
    border-radius: 50%;
    opacity: 0;
    animation: twinkle 3s ease-in-out infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0; transform: scale(0.5); }
    50% { opacity: 0.8; transform: scale(1); }
}

/* Header */
.app-header {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 2rem 1rem;
}

.main-title {
    font-size: 2.5rem;
    font-weight: 800;
    animation: float 3s ease-in-out infinite;
    background: linear-gradient(45deg, #FF69B4, #8A2BE2, #FF69B4);
    background-size: 200% auto;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: float 3s ease-in-out infinite, gradient-shift 3s ease infinite;
}

.night-mode .main-title {
    background: linear-gradient(45deg, #FF00FF, #00FFFF, #FF00FF);
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes gradient-shift {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-top: 0.5rem;
    font-family: 'Space Grotesk', sans-serif;
}

.header-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.mode-btn {
    padding: 0.6rem 1.2rem;
    border-radius: 25px;
    border: none;
    background: rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.night-mode .mode-btn {
    background: rgba(255, 255, 255, 0.15);
    color: var(--night-text);
}

.mode-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

/* Main Content */
.main-content {
    position: relative;
    z-index: 10;
    max-width: 600px;
    margin: 0 auto;
    padding: 0 1rem 2rem;
}

/* Input Card */
.input-card {
    background: var(--day-card);
    border-radius: 20px;
    padding: 1.5rem;
    border: 2px solid var(--day-pink);
    box-shadow: 0 10px 40px rgba(0,0,0,0.15);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.night-mode .input-card {
    background: var(--night-card);
    border-color: var(--night-accent);
}

.scenario-input {
    width: 100%;
    padding: 1rem;
    border-radius: 12px;
    border: 2px solid var(--day-accent);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    resize: none;
    background: rgba(255,255,255,0.8);
    transition: all 0.3s ease;
}

.night-mode .scenario-input {
    background: rgba(0,0,0,0.3);
    border-color: var(--night-accent);
    color: var(--night-text);
}

.scenario-input:focus {
    outline: none;
    box-shadow: 0 0 20px rgba(255, 105, 180, 0.4);
}

.simulate-btn {
    padding: 1rem 2rem;
    border-radius: 15px;
    border: none;
    background: linear-gradient(135deg, #FF69B4, #8A2BE2);
    color: white;
    font-family: 'Poppins', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(255, 105, 180, 0.4);
}

.night-mode .simulate-btn {
    background: linear-gradient(135deg, #FF00FF, #00FFFF);
}

.simulate-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(255, 105, 180, 0.5);
}

.simulate-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.random-btn {
    padding: 0.8rem 1.5rem;
    border-radius: 15px;
    border: none;
    background: linear-gradient(135deg, #FFCF33, #FFA500);
    color: #333;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.night-mode .random-btn {
    background: linear-gradient(135deg, #FFDF00, #FF4500);
}

.random-btn:hover {
    transform: translateY(-2px);
}

/* Loading */
.loading-container {
    text-align: center;
    padding: 3rem 1rem;
}

.loading-spinner {
    width: 100px;
    height: 100px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    background: conic-gradient(from 0deg, #FF69B4, #8A2BE2, #00FFFF, #FFD700, #FF69B4);
    animation: spin 1.5s linear infinite, hue-rotate 3s linear infinite;
    position: relative;
}

.loading-spinner::after {
    content: '';
    position: absolute;
    inset: 8px;
    background: inherit;
    border-radius: 50%;
    filter: blur(8px);
    opacity: 0.6;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes hue-rotate {
    to { filter: hue-rotate(360deg); }
}

.loading-text {
    font-size: 1.2rem;
    font-weight: 500;
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* Error */
.error-card {
    background: linear-gradient(135deg, #FFB6C1, #FFC0CB);
    border-radius: 15px;
    padding: 1.5rem;
    text-align: center;
    margin: 1rem 0;
}

.error-btn {
    margin-top: 1rem;
    padding: 0.5rem 1.5rem;
    border-radius: 10px;
    border: none;
    background: #FF69B4;
    color: white;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
}

/* Results */
.results-container {
    margin-top: 2rem;
    animation: fadeInUp 0.6s ease;
}

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

.story-card {
    background: var(--day-card);
    border-radius: 20px;
    padding: 1.5rem;
    border: 2px solid var(--day-pink);
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
    margin-bottom: 1.5rem;
}

.night-mode .story-card {
    background: var(--night-card);
    border-color: var(--night-accent);
}

.timeline-title {
    font-size: 1.8rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, #8A2BE2, #FF69B4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.night-mode .timeline-title {
    background: linear-gradient(45deg, #00FFFF, #FF00FF);
    -webkit-background-clip: text;
    background-clip: text;
}

.story-text {
    font-family: 'Space Grotesk', sans-serif;
    line-height: 1.7;
}

.story-text p {
    margin-bottom: 1rem;
}

.story-text p:last-child {
    margin-bottom: 0;
}

/* Impacts Section */
.impacts-section {
    margin-bottom: 1.5rem;
}

.section-header {
    font-size: 1.3rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 1rem;
}

.impacts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 500px) {
    .impacts-grid {
        grid-template-columns: 1fr;
    }
}

.impact-card {
    background: var(--day-card);
    border-radius: 15px;
    padding: 1rem;
    border: 2px solid var(--day-pink);
}

.night-mode .impact-card {
    background: var(--night-card);
    border-color: var(--night-accent);
}

.impact-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.night-mode .impact-header {
    border-bottom-color: rgba(255,255,255,0.1);
}

.impact-emoji {
    font-size: 1.5rem;
}

.impact-category {
    font-weight: 700;
}

.impact-row {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.reality-badge {
    font-size: 0.65rem;
    font-weight: 700;
    padding: 0.2rem 0.4rem;
    border-radius: 6px;
    white-space: nowrap;
    flex-shrink: 0;
}

.reality-badge.our {
    background: rgba(128, 128, 128, 0.3);
}

.reality-badge.alt {
    background: linear-gradient(135deg, #FF69B4, #8A2BE2);
    color: white;
}

.night-mode .reality-badge.alt {
    background: linear-gradient(135deg, #FF00FF, #00FFFF);
}

.impact-text {
    font-size: 0.85rem;
    font-family: 'Space Grotesk', sans-serif;
    opacity: 0.8;
}

.alt-text {
    opacity: 1;
    font-weight: 500;
}

/* Images Section */
.images-section {
    margin-bottom: 1.5rem;
}

.images-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (max-width: 500px) {
    .images-grid {
        grid-template-columns: 1fr;
    }
}

.image-card {
    background: white;
    border-radius: 12px;
    padding: 0.5rem;
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
    transition: transform 0.3s ease;
}

.night-mode .image-card {
    background: #1a0a2e;
    border: 2px solid var(--night-accent);
}

.image-card:hover {
    transform: scale(1.02);
}

.scene-image {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 8px;
}

.image-caption {
    font-size: 0.8rem;
    text-align: center;
    margin-top: 0.5rem;
    font-family: 'Space Grotesk', sans-serif;
    opacity: 0.8;
    line-height: 1.3;
}

/* Dive Deeper Button */
.dive-deeper-btn {
    width: 100%;
    padding: 1rem;
    border-radius: 15px;
    border: none;
    background: linear-gradient(135deg, #8A2BE2, #FF69B4);
    color: white;
    font-family: 'Poppins', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(138, 43, 226, 0.4);
}

.night-mode .dive-deeper-btn {
    background: linear-gradient(135deg, #FF00FF, #00FFFF);
}

.dive-deeper-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(138, 43, 226, 0.5);
}

.dive-deeper-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* History Panel */
.history-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.history-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    backdrop-filter: blur(5px);
}

.history-panel {
    position: absolute;
    right: 0;
    top: 0;
    height: 100%;
    width: 100%;
    max-width: 400px;
    background: var(--day-card);
    padding: 1.5rem;
    overflow-y: auto;
    box-shadow: -10px 0 40px rgba(0,0,0,0.3);
}

.night-mode .history-panel {
    background: linear-gradient(145deg, #2d1b4e, #1a0a2e);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.history-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.close-btn:hover {
    opacity: 1;
}

.no-history {
    opacity: 0.7;
    text-align: center;
    padding: 2rem 0;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.history-item {
    background: rgba(255,255,255,0.3);
    border: 2px solid var(--day-pink);
    border-radius: 12px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.night-mode .history-item {
    background: rgba(0,0,0,0.2);
    border-color: var(--night-accent);
}

.history-item:hover {
    transform: translateX(-5px);
    background: rgba(255,255,255,0.5);
}

.night-mode .history-item:hover {
    background: rgba(138, 43, 226, 0.2);
}

.history-scenario {
    font-weight: 600;
    margin-bottom: 0.3rem;
}

.history-world {
    font-size: 0.85rem;
    opacity: 0.7;
    font-family: 'Space Grotesk', sans-serif;
}

.back-btn {
    width: 100%;
    padding: 1rem;
    margin-top: 1.5rem;
    border-radius: 12px;
    border: 2px solid var(--day-pink);
    background: transparent;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.night-mode .back-btn {
    border-color: var(--night-accent);
    color: var(--night-text);
}

.back-btn:hover {
    background: var(--day-pink);
    color: white;
}

.night-mode .back-btn:hover {
    background: var(--night-accent);
    color: #333;
}

/* Footer */
.app-footer {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 2rem 1rem;
}

.app-footer p {
    margin-bottom: 0.5rem;
}

.footer-link {
    color: var(--day-pink);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.night-mode .footer-link {
    color: var(--night-accent);
}

.footer-link:hover {
    color: var(--day-accent);
}

.night-mode .footer-link:hover {
    color: var(--night-pink);
}

.disclaimer {
    font-size: 0.75rem;
    opacity: 0.6;
    margin-top: 0.5rem;
    font-family: 'Space Grotesk', sans-serif;
}

/* Responsive */
@media (max-width: 600px) {
    .main-title {
        font-size: 1.8rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .simulate-btn {
        font-size: 1rem;
    }
    
    .timeline-title {
        font-size: 1.4rem;
    }
}