/* ========================================
   Global Styles & Reset
   ======================================== */

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

:root {
    /* Colors */
    --color-primary: #007AFF;
    --color-primary-dark: #0056B3;
    --color-secondary: #34C759;
    --color-background: #FFFFFF;
    --color-chat-bg: #F7F7F7;
    --color-ellie-bubble: #E8F0FE;
    --color-user-bubble: #DCF8C6;
    --color-text: #1C1C1E;
    --color-text-secondary: #8E8E93;
    --color-border: #E5E5EA;
    --color-shadow: rgba(0, 0, 0, 0.08);
    --color-online: #34C759;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 16px;
    --font-size-large: 18px;
    --font-size-xlarge: 24px;
    --font-size-small: 14px;
    --font-size-xsmall: 12px;
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-bubble: 18px;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    cursor: pointer;
    font-family: inherit;
    border: none;
    background: none;
}

ul {
    list-style: none;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('assets/Chat_BG_png.png');
    opacity: 0.05;
    z-index: 0;
}

.hero-content {
    max-width: 600px;
    text-align: center;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease;
}

.hero-logo {
    margin-bottom: var(--spacing-lg);
    animation: bounceIn 1s ease;
}

.logo-small {
    width: 80px;
    height: 80px;
    margin: 0 auto;
}

.hero-text h1 {
    font-size: clamp(28px, 5vw, 42px);
    font-weight: 700;
    color: white;
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.hero-subtitle {
    font-size: var(--font-size-large);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-sm);
}

.hero-meta {
    font-size: var(--font-size-small);
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-xl);
}

.hero-elephant {
    margin: var(--spacing-xl) 0;
    animation: float 3s ease-in-out infinite;
}

.hero-image {
    max-width: 300px;
    margin: 0 auto;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.2));
}

.btn-primary {
    background: white;
    color: #667eea;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-xl);
    font-size: var(--font-size-large);
    font-weight: 600;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-normal);
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

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

/* ========================================
   Chat Section
   ======================================== */

.chat-section {
    min-height: 100vh;
    padding: var(--spacing-xl) var(--spacing-md);
    background: linear-gradient(to bottom, #f0f0f5, #ffffff);
    display: none;
}

.chat-section.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

.chat-container {
    max-width: 700px;
    margin: 0 auto;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px var(--color-shadow);
    overflow: hidden;
}

/* Chat Header */
.chat-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: var(--spacing-md);
    color: white;
    position: sticky;
    top: 0;
    z-index: 100;
}

.chat-header-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.chat-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 3px solid white;
    object-fit: cover;
}

.chat-header-info h2 {
    font-size: var(--font-size-large);
    margin-bottom: 2px;
}

.chat-header-info p {
    font-size: var(--font-size-small);
    opacity: 0.9;
}

.status-online {
    position: relative;
    padding-left: 14px;
}

.status-online::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--color-secondary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

/* Chat Messages Area */
.chat-messages {
    min-height: 400px;
    max-height: 600px;
    overflow-y: auto;
    padding: var(--spacing-lg);
    background: url('assets/Chat_BG_png.png');
    background-size: 200px;
    background-color: #f8f8f8;
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

.message {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    animation: messageSlideIn 0.3s ease;
}

.message.ellie {
    justify-content: flex-start;
}

.message.user {
    justify-content: flex-end;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
    align-self: flex-end;
}

.message.user .message-avatar {
    display: none;
}

.message-bubble {
    max-width: 75%;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-bubble);
    font-size: var(--font-size-base);
    line-height: 1.5;
    word-wrap: break-word;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.message.ellie .message-bubble {
    background: var(--color-ellie-bubble);
    color: var(--color-text);
    border-bottom-left-radius: 4px;
}

.message.user .message-bubble {
    background: var(--color-user-bubble);
    color: var(--color-text);
    border-bottom-right-radius: 4px;
}

.message-bubble ul {
    list-style: disc;
    padding-left: var(--spacing-lg);
    margin-top: var(--spacing-xs);
}

.message-bubble ul li {
    margin-bottom: var(--spacing-xs);
}

/* Typing Indicator */
.typing-indicator {
    display: none;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0 var(--spacing-lg) var(--spacing-md);
}

.typing-indicator.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.typing-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
}

.typing-bubble {
    background: var(--color-ellie-bubble);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-bubble);
    border-bottom-left-radius: 4px;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.typing-bubble span {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

.typing-dots {
    display: flex;
    gap: 4px;
}

.typing-dots span {
    width: 6px;
    height: 6px;
    background: var(--color-text-secondary);
    border-radius: 50%;
    animation: typingDot 1.4s infinite;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}

/* Chat Options */
.chat-options {
    padding: var(--spacing-md) var(--spacing-lg);
    display: none;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.chat-options.active {
    display: flex;
    animation: fadeIn 0.3s ease;
}

.option-btn {
    background: white;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-align: left;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.option-btn:hover {
    background: var(--color-primary);
    color: white;
    transform: translateX(4px);
}

.option-btn:active {
    transform: translateX(2px);
}

/* Chat Exit */
.chat-exit {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.btn-exit {
    color: var(--color-text-secondary);
    font-size: var(--font-size-small);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-exit:hover {
    color: var(--color-primary);
    background: var(--color-chat-bg);
}

/* ========================================
   Major Match Section
   ======================================== */

.major-match-section {
    padding: var(--spacing-xxl) var(--spacing-md);
    background: linear-gradient(to bottom right, #f8f9ff, #fff5f8);
}

.major-match-container {
    max-width: 1000px;
    margin: 0 auto;
}

.major-match-content {
    text-align: center;
}

.major-match-content h2 {
    font-size: clamp(28px, 4vw, 36px);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.major-match-content > p {
    font-size: var(--font-size-large);
    color: var(--color-text-secondary);
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.match-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.match-feature {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px var(--color-shadow);
    transition: transform var(--transition-normal);
}

.match-feature:hover {
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 48px;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.match-feature h3 {
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-xs);
}

.match-feature p {
    font-size: var(--font-size-small);
    color: var(--color-text-secondary);
}

.match-preview {
    margin: var(--spacing-xl) auto;
    max-width: 400px;
}

.match-card-preview {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    animation: float 3s ease-in-out infinite;
}

.preview-character {
    width: 200px;
    height: 200px;
    margin: 0 auto var(--spacing-md);
    object-fit: contain;
}

.preview-info h4 {
    font-size: var(--font-size-xlarge);
    margin-bottom: var(--spacing-xs);
}

.preview-info p {
    color: var(--color-text-secondary);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xxl);
    font-size: var(--font-size-large);
}

/* ========================================
   Info Section
   ======================================== */

.info-section {
    padding: var(--spacing-xxl) var(--spacing-md);
    background: white;
}

.info-container {
    max-width: 1200px;
    margin: 0 auto;
}

.info-container h2 {
    font-size: clamp(28px, 4vw, 36px);
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.info-card {
    background: var(--color-chat-bg);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--color-shadow);
}

.info-card.highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.info-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
}

.info-card h3 {
    font-size: var(--font-size-xlarge);
    margin-bottom: var(--spacing-md);
}

.info-card ul {
    list-style: none;
}

.info-card ul li {
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    position: relative;
}

.info-card ul li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
    font-size: 20px;
}

.info-card.highlight ul li::before {
    color: rgba(255, 255, 255, 0.8);
}

.info-card p {
    line-height: 1.7;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background: var(--color-text);
    color: white;
    padding: var(--spacing-xl) var(--spacing-md);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-icon {
    width: 60px;
    height: 60px;
}

.footer-logo p {
    font-size: var(--font-size-small);
    opacity: 0.8;
}

.footer-links h4 {
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-large);
}

.footer-links ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-legal p {
    font-size: var(--font-size-small);
    opacity: 0.7;
    margin-bottom: var(--spacing-xs);
}

.footer-legal-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.footer-legal-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-small);
}

/* ========================================
   Animations
   ======================================== */

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounceIn {
    0% {
        opacity: 0;
        transform: scale(0.3);
    }
    50% {
        opacity: 1;
        transform: scale(1.05);
    }
    70% {
        transform: scale(0.9);
    }
    100% {
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

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

@keyframes typingDot {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-10px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    :root {
        --font-size-base: 15px;
        --spacing-xl: 24px;
        --spacing-xxl: 32px;
    }
    
    .hero {
        min-height: auto;
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .hero-elephant {
        margin: var(--spacing-lg) 0;
    }
    
    .hero-image {
        max-width: 200px;
    }
    
    .chat-messages {
        max-height: 500px;
    }
    
    .message-bubble {
        max-width: 85%;
    }
    
    .info-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .btn-primary {
        width: 100%;
    }
    
    .match-features {
        grid-template-columns: 1fr;
    }
}