/* 
 * Main Stylesheet
 * HyperCreative AI Prompt Library
 */

/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --color-primary: #6366F1;
    --color-secondary: #8B5CF6;
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    
    /* Neutrals */
    --color-bg: #F9FAFB;
    --color-card: #FFFFFF;
    --color-text-primary: #111827;
    --color-text-secondary: #6B7280;
    --color-border: #E5E7EB;
    
    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
    --shadow-hover: 0 8px 16px rgba(0,0,0,0.12);
    
    /* Typography */
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'Courier New', monospace;
}

/* ===== Reset & Base ===== */
html, body {
    margin: 0 !important;
    padding: 0 !important;
}

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

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    margin: 0;
    padding: 0;
}

h1, h2, h3, h4, h5, h6 {
    line-height: 1.2;
    font-weight: 700;
    margin: 0 0 var(--spacing-md) 0;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--color-secondary);
}

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

/* ===== Layout ===== */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-narrow {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ===== Header ===== */
.header {
    background: var(--color-card);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo-wrapper {
    display: flex;
    flex-direction: column;
    line-height: 1;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    display: inline-block;
}

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

.site-citation {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    margin-top: 2px;
    font-weight: 500;
}

.site-citation a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.site-citation a:hover {
    color: var(--color-primary);
}

/* Navigation */
.nav {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    color: var(--color-text-primary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

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

.nav-link.external::after {
    content: " ↗";
    font-size: 0.875rem;
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-primary);
}

/* ===== Search Bar ===== */
.search-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-bottom: 1px solid var(--color-border);
}

.search-filter-wrapper {
    display: flex;
    gap: var(--spacing-lg);
    max-width: 100%;
    margin: 0 auto;
    align-items: center;
    flex-wrap: nowrap;
    justify-content: center;
}

.search-input-wrapper {
    position: relative;
    flex: 1;
    min-width: 250px;
    max-width: 600px;
}

.search-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-3xl) var(--spacing-md) var(--spacing-2xl);
    font-size: 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    outline: none;
    transition: all 0.3s ease;
    background: var(--color-card);
    color: var(--color-text-primary);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.search-input::placeholder {
    color: var(--color-text-secondary);
}

.search-input:focus {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15), 0 2px 12px rgba(99, 102, 241, 0.2);
    background: var(--color-card);
}

.search-input:hover:not(:focus) {
    border-color: var(--color-primary);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.search-icon {
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-secondary);
    font-size: 1.25rem;
    pointer-events: none;
    transition: all 0.3s ease;
}

.search-input:focus ~ .search-icon {
    color: var(--color-primary);
    transform: translateY(-50%) scale(1.15);
}

.sort-select {
    padding: var(--spacing-md) var(--spacing-lg);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-card);
    color: var(--color-text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 180px;
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    font-weight: 500;
}

.sort-select:hover,
.sort-select:focus {
    border-color: var(--color-primary);
    outline: none;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15), 0 2px 12px rgba(99, 102, 241, 0.2);
}

/* ===== Category Tabs ===== */
.category-tabs {
    display: flex;
    gap: var(--spacing-md);
    overflow-x: auto;
    padding: var(--spacing-lg) 0;
    scrollbar-width: thin;
    scroll-behavior: smooth;
}

.category-tabs::-webkit-scrollbar {
    height: 4px;
}

.category-tabs::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

.category-tab {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    background: var(--color-card);
    color: var(--color-text-primary);
    font-weight: 500;
    white-space: nowrap;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.category-tab:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.category-tab.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.category-count {
    background: rgba(255,255,255,0.3);
    padding: 2px 8px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
}

.category-tab.active .category-count {
    background: rgba(255,255,255,0.3);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--color-primary);
    color: white;
}

.btn-primary:hover {
    background: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: var(--color-secondary);
    color: white;
}

.btn-secondary:hover {
    background: var(--color-primary);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
}

/* Copy Button */
.copy-btn {
    background: var(--color-secondary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all 0.2s ease;
}

.copy-btn:hover {
    background: var(--color-primary);
    transform: scale(1.05);
}

.copy-btn.copied {
    background: var(--color-success);
}

/* ===== Prompt Card ===== */
.prompt-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.prompt-card {
    background: var(--color-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
    cursor: pointer;
}

.prompt-card-link:hover .prompt-card {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
}

.prompt-thumbnail {
    width: 100%;
    height: 200px;
    object-fit: cover;
    position: relative;
}

.prompt-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.gradient-thumb {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    text-align: center;
}

.gradient-title {
    color: white;
    font-weight: 700;
    font-size: 1.125rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.category-badge {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(10px);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
}

.prompt-content {
    padding: var(--spacing-lg);
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.prompt-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--color-text-primary);
}

.prompt-card-link:hover .prompt-title {
    color: var(--color-primary);
}

.prompt-description {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex-grow: 1;
}

.prompt-meta {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: auto;
}

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

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-2xl) 0;
}

.page-number {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--color-card);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 40px;
    text-align: center;
}

.page-number:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.page-number.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

/* ===== Toast Notification ===== */
.toast {
    position: fixed;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideIn 0.3s ease;
}

.toast.success {
    background: var(--color-success);
    color: white;
}

.toast.error {
    background: var(--color-error);
    color: white;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===== Footer ===== */
.footer {
    background: var(--color-card);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-secondary);
}

.social-link:hover {
    color: var(--color-primary) !important;
    transform: translateY(-2px);
    display: inline-block;
}

/* ===== Utility Classes ===== */
.text-center { text-align: center; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }