/* ===================
   CSS Variables
   =================== */
:root {
    /* Color System */
    --color-primary: #0070f3;
    --color-primary-dark: #0051cc;
    --color-secondary: #ff3366;
    --color-accent: #7c3aed;
    --color-success: #4CAF50;
    --color-warning: #FF9800;
    --color-error: #F44336;

    /* Neutral Colors */
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666;
    --color-text-muted: #999;
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-border-light: #e2e8f0;
    --color-border-medium: #cbd5e1;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    --gradient-secondary: linear-gradient(135deg, var(--color-secondary), #ff1744);
    --gradient-purple: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-full: 9999px;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;

    /* Layout */
    --header-height: 70px;
    --max-content-width: 1400px;

    /* Transitions */
    --transition-base: all 0.3s ease;
    --transition-slow: all 0.5s ease;

    /* Z-index */
    --z-header: 1000;
    --z-overlay: 999;
    --z-modal: 1002;
}

/* ===================
   Reset & Base
   =================== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg-secondary);
    min-height: 100vh;
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===================
   HEADER
   =================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border-light);
    z-index: var(--z-header);
    box-shadow: 0 1px 3px rgba(0,0,0,0.03);
}

.header-content {
    width: 100%;
    max-width: var(--max-content-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.header-nav {
    display: flex;
    gap: var(--spacing-xs);
    align-items: center;
}

.header-nav-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.header-nav-link:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    cursor: pointer;
    transition: var(--transition-base);
    user-select: none;
    letter-spacing: -0.02em;
}

.logo:hover {
    transform: scale(1.03);
}

.header-search {
    flex: 1;
    max-width: 500px;
}

.header-search form {
    position: relative;
}

.search-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    pointer-events: none;
    z-index: 1;
}

.search-input {
    width: 100%;
    padding: 0.65rem var(--spacing-md) 0.65rem 2.75rem;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition-base);
    background: var(--color-bg-secondary);
}

.search-input:focus {
    border-color: var(--color-primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.08);
}

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

.user-info {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.auth-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.5rem 0.9rem;
    font-size: 0.85rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-full);
    transition: var(--transition-base);
    border: none;
    background: transparent;
    color: var(--color-text-secondary);
    cursor: pointer;
    white-space: nowrap;
}

.auth-button:hover {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
}

.logout-button {
    background: var(--color-text-primary);
    color: white;
}

.logout-button:hover {
    background: var(--color-text-secondary);
}

/* ===================
   LAYOUT
   =================== */
.main-layout {
    margin-top: var(--header-height);
}

.main-content {
    width: 100%;
    background: var(--color-bg-secondary);
}

/* Alert Messages */
.alert {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #dc2626;
    padding: var(--spacing-md) var(--spacing-xl);
    text-align: center;
    font-weight: 500;
    border-bottom: 1px solid #fca5a5;
    font-size: 0.9rem;
}

/* ===================
   HERO SECTION
   =================== */
.hero-section {
    background: var(--gradient-purple);
    padding: var(--spacing-4xl) var(--spacing-2xl);
    text-align: center;
    color: white;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="60" height="60" xmlns="http://www.w3.org/2000/svg"><circle cx="30" cy="30" r="1" fill="white" opacity="0.1"/></svg>');
    opacity: 0.3;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-2xl);
    opacity: 0.95;
    font-weight: 400;
}

/* ===================
   HERO CHATBOT
   =================== */
.hero-chatbot-container {
    max-width: 700px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-xl);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.hero-chat-messages {
    max-height: 200px;
    min-height: 80px;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.hero-chat-messages::-webkit-scrollbar {
    width: 4px;
}

.hero-chat-messages::-webkit-scrollbar-thumb {
    background: var(--color-border-medium);
    border-radius: var(--radius-full);
}

.bot-message,
.user-message {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    animation: fadeInUp 0.3s ease;
}

.bot-message {
    align-self: flex-start;
}

.bot-message > i {
    width: 32px;
    height: 32px;
    background: var(--gradient-purple);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.bot-message span,
.user-message span {
    background: var(--color-bg-tertiary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    color: var(--color-text-primary);
    line-height: 1.5;
    max-width: 80%;
}

.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.user-message span {
    background: var(--gradient-primary);
    color: white;
}

.hero-chat-input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border-light);
}

.hero-chat-input {
    flex: 1;
    padding: 0.9rem var(--spacing-lg);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-full);
    font-size: 1rem;
    outline: none;
    transition: var(--transition-base);
    background: white;
}

.hero-chat-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.1);
}

.hero-chat-button {
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.hero-chat-button:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.hero-chat-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Chat Product Cards */
.hero-chat-products {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-sm) 0;
    margin-top: var(--spacing-sm);
}

.hero-chat-products::-webkit-scrollbar {
    height: 4px;
}

.hero-chat-product-card {
    flex-shrink: 0;
    width: 120px;
    background: white;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    color: inherit;
}

.hero-chat-product-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.hero-chat-product-card img {
    width: 100%;
    height: 80px;
    object-fit: cover;
}

.hero-chat-product-info {
    padding: var(--spacing-xs) var(--spacing-sm);
}

.hero-chat-product-info p {
    font-size: 0.7rem;
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.hero-chat-product-info .price {
    font-weight: 600;
    color: var(--color-primary);
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    width: fit-content;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--color-text-muted);
    border-radius: var(--radius-full);
    animation: typingBounce 1.4s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); }
    30% { transform: translateY(-4px); }
}

/* ===================
   SECTIONS
   =================== */
.story-section {
    max-width: var(--max-content-width);
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-2xl);
}

.story-section.compact {
    padding: var(--spacing-2xl) var(--spacing-2xl);
}

.story-section.compact .section-header {
    margin-bottom: var(--spacing-lg);
}

.story-section.compact .section-title {
    font-size: 1.5rem;
}

.story-section.compact .section-subtitle {
    font-size: 0.95rem;
}

.section-header {
    margin-bottom: var(--spacing-2xl);
    text-align: center;
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-md);
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.ai-recommend-section {
    max-width: var(--max-content-width);
    margin: 0 auto;
    padding: var(--spacing-2xl);
}

/* ===================
   CHAT PRODUCT CARDS
   =================== */
.chat-product-cards-wrapper {
    padding: var(--spacing-sm) 0;
    margin-left: 40px; /* 로봇 아이콘 너비만큼 */
}

.chat-product-cards-container {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
    padding: var(--spacing-sm) 0;
    scroll-behavior: smooth;
}

.chat-product-cards-container::-webkit-scrollbar {
    height: 4px;
}

.chat-product-cards-container::-webkit-scrollbar-thumb {
    background: var(--color-border-medium);
    border-radius: var(--radius-full);
}

.chat-product-card {
    flex-shrink: 0;
    width: 140px;
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border-light);
    cursor: pointer;
    transition: var(--transition-base);
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow-sm);
}

.chat-product-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.chat-product-image {
    width: 100%;
    height: 100px;
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

.chat-product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.chat-product-card:hover .chat-product-image img {
    transform: scale(1.05);
}

.chat-product-info {
    padding: var(--spacing-sm);
}

.chat-product-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0 0 4px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.chat-product-category {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    margin: 0 0 6px 0;
}

.chat-product-link {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--color-primary);
    transition: var(--transition-base);
}

.chat-product-card:hover .chat-product-link {
    color: var(--color-primary-dark);
}

/* 채팅 메시지 영역 높이 조정 */
.hero-chat-messages {
    max-height: 300px;
    min-height: 100px;
}

/* ===================
   FILTER BAR
   =================== */
.filter-bar {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-2xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
}

.filter-bar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.filter-bar-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.filter-toggle {
    display: none;
    background: var(--color-bg-secondary);
    border: none;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    transition: var(--transition-base);
}

.filter-toggle:hover {
    background: var(--color-border-light);
    color: var(--color-text-primary);
}

.filter-form {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

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

.filter-label {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.radio-group {
    display: flex;
    gap: var(--spacing-md);
}

.radio-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.radio-option input[type="radio"] {
    cursor: pointer;
}

.radio-option label {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    cursor: pointer;
    user-select: none;
}

.radio-option input[type="radio"]:checked + label {
    color: var(--color-primary);
    font-weight: 500;
}

.select-box {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    background: white;
    font-size: 0.9rem;
    color: var(--color-text-primary);
    cursor: pointer;
    transition: var(--transition-base);
}

.select-box:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 112, 243, 0.08);
}

.filter-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.apply-button {
    flex: 1;
    padding: 0.7rem var(--spacing-lg);
    background: var(--color-text-primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.apply-button:hover {
    background: var(--color-text-secondary);
    transform: translateY(-1px);
}

.reset-button {
    padding: 0.7rem var(--spacing-lg);
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: var(--transition-base);
}

.reset-button:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-border-medium);
}

/* ===================
   PRODUCT GRID
   =================== */
.story-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-2xl);
}

.story-grid.compact {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.story-grid.compact .product-card:nth-child(n+5) {
    display: none;
}

/* ===================
   PRODUCT CARD
   =================== */
.product-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition-slow);
    cursor: pointer;
    border: 1px solid var(--color-border-light);
}

.product-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.product-image-wrapper {
    position: relative;
    overflow: hidden;
    aspect-ratio: 3/4;
    background: var(--color-bg-secondary);
}

.product-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.product-card:hover .product-image-wrapper img {
    transform: scale(1.08);
}

.product-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.product-card:hover .product-overlay {
    opacity: 1;
}

.product-actions {
    position: absolute;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    opacity: 0;
    transform: translateY(10px);
    transition: all 0.4s ease;
}

.product-card:hover .product-actions {
    opacity: 1;
    transform: translateY(0);
}

.action-button {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    border: none;
    background: white;
    cursor: pointer;
    transition: var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    font-size: 0.9rem;
    color: var(--color-text-primary);
}

.action-button:hover {
    transform: scale(1.1);
}

.action-button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.action-button.wishlist:hover:not(:disabled) {
    background: var(--color-secondary);
    color: white;
}

.action-button.cart:hover:not(:disabled) {
    background: var(--color-primary);
    color: white;
}

.product-info {
    padding: var(--spacing-lg);
}

.brand-name {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

.product-name {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    min-height: 2.8rem;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}

.product-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-primary);
}

.product-reason {
    margin-top: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* No Products State */
.no-products {
    text-align: center;
    padding: var(--spacing-4xl) var(--spacing-2xl);
    color: var(--color-text-secondary);
}

.no-products i {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.3;
}

.no-products h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

/* ===================
   PAGINATION
   =================== */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-3xl) var(--spacing-2xl);
}

.pagination a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--spacing-sm);
    border-radius: var(--radius-sm);
    background: white;
    color: var(--color-text-primary);
    text-decoration: none;
    transition: var(--transition-base);
    font-weight: 500;
    border: 1px solid var(--color-border-light);
    font-size: 0.9rem;
}

.pagination a:hover,
.pagination a.active {
    background: var(--color-text-primary);
    color: white;
    border-color: var(--color-text-primary);
    transform: translateY(-2px);
}

/* ===================
   STATUS INDICATOR
   =================== */
.recommendation-status {
    position: fixed;
    bottom: var(--spacing-2xl);
    right: var(--spacing-2xl);
    z-index: var(--z-header);
}

#recommendation-health-indicator {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: #ccc;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: var(--transition-base);
}

#recommendation-health-indicator:hover {
    transform: scale(1.3);
}

/* ===================
   UTILITY CLASSES
   =================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.disabled-link {
    pointer-events: none;
    opacity: 0.5;
    cursor: not-allowed;
}

.hidden {
    display: none;
}

/* ===================
   ANIMATIONS
   =================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.animate-fade-in {
    animation: fadeInUp 0.8s ease forwards;
}

/* ===================
   RESPONSIVE DESIGN
   =================== */
@media (max-width: 1024px) {
    .story-grid {
        grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
        gap: var(--spacing-lg);
    }

    .story-grid.compact {
        grid-template-columns: repeat(4, 1fr);
        gap: var(--spacing-md);
    }

    .filter-form {
        grid-template-columns: 1fr;
    }

    .header-nav {
        display: none;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    .header-content {
        padding: 0 var(--spacing-md);
    }

    .logo {
        font-size: 1.3rem;
    }

    .header-search,
    .header-nav {
        display: none;
    }

    .auth-button span {
        display: none;
    }

    .hero-section {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-chatbot-container {
        margin: 0 var(--spacing-md);
    }

    .hero-chat-messages {
        max-height: 150px;
    }

    .hero-chat-input {
        font-size: 0.9rem;
    }

    .story-section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .story-section.compact {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .section-title {
        font-size: 1.5rem;
    }

    .story-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }

    .story-grid.compact {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }

    .product-info {
        padding: var(--spacing-md);
    }

    .filter-bar {
        padding: var(--spacing-md);
    }

    .filter-toggle {
        display: block;
    }

    .filter-form {
        display: none;
    }

    .filter-form.show {
        display: grid;
        margin-top: var(--spacing-lg);
    }

    .radio-group {
        flex-direction: column;
    }

    .filter-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .story-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================
   PRINT STYLES
   =================== */
@media print {
    .header,
    .filter-bar,
    .product-actions,
    .recommendation-status,
    .hero-chatbot-container {
        display: none !important;
    }

    body {
        background: white;
    }
}