/* style.css - Design System for LiteAI (Modern AI Directory) */

@import url('https://fonts.googleapis.com/css2?family=Inter:ital,opsz,wght@0,14..32,100..900;1,14..32,100..900&display=swap');

:root {
    --bg-main: #F8FAFC;
    --bg-card: #FFFFFF;
    --text-primary: #0F172A;
    --text-secondary: #64748B;
    --accent: #6366F1;
    --accent-light: #EEF2FF;
    --accent-hover: #4F46E5;
    --success: #10B981;
    --success-light: #ECFDF5;
    --pink: #EC4899;
    --pink-light: #FDF2F8;
    --violet: #8B5CF6;
    --violet-light: #F5F3FF;
    --amber: #F59E0B;
    --amber-light: #FFFBEB;
    --border: #E2E8F0;
    --shadow-soft: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-premium: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --glass: rgba(255, 255, 255, 0.7);
    --radius: 12px;
    --transition: cubic-bezier(0.4, 0, 0.2, 1);
    --section-spacing: 5rem;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.7;
    /* Slightly increased for better readability */
    overflow-x: hidden;
}

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

/* Header & Glassmorphism */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(12px);
    background: var(--glass);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--accent), var(--pink));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
}

/* Hero Section */
.hero {
    position: relative;
    padding: 6rem 0 var(--section-spacing);
    /* Unified bottom spacing */
    text-align: center;
    background: url('ai_hero.png') no-repeat center center;
    background-size: cover;
    overflow: hidden;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: -1.5px;
    margin-bottom: 1.5rem;
    /* Increased space */
    color: var(--text-primary);
    line-height: 1.1;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 650px;
    /* Slightly wider */
    margin: 0 auto 3rem;
    /* Increased bottom margin */
}

.search-container {
    max-width: 650px;
    margin: 0 auto 4rem;
    /* Increased spacing between search and filters */
    position: relative;
    box-shadow: var(--shadow-premium);
    border-radius: 12px;
}

.search-input {
    width: 100%;
    padding: 1.25rem 1.5rem 1.25rem 3.5rem;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 1.1rem;
    font-family: inherit;
    outline: none;
    transition: all 0.3s var(--transition);
    background: var(--bg-card);
}

.search-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px var(--accent-light);
}

.search-icon {
    position: absolute;
    left: 1.5rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 1.2rem;
}

/* Category Filters */
.category-filters {
    display: flex;
    gap: 0.85rem;
    /* Slightly more gap */
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--section-spacing);
    /* Unified bottom spacing */
    padding: 0.5rem;
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}

.filter-chip {
    padding: 0.5rem 1.25rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s var(--transition);
}

.filter-chip:hover,
.filter-chip.active {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Tool Grid */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 2rem;
    padding: var(--section-spacing) 0px;
    /* Unified bottom spacing */
    animation: fadeIn 0.8s ease-out forwards;
}

/* Tool Cards */
.tool-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    height: 100%;
    transition: all 0.4s var(--transition);
    position: relative;
    overflow: hidden;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-premium);
    border-color: var(--accent-light);
}

.tool-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--pink));
    opacity: 0;
    transition: opacity 0.3s;
}

.tool-card:hover::after {
    opacity: 1;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.tool-icon {
    width: 48px;
    height: 48px;
    object-fit: contain;
    background: var(--accent-light);
    border-radius: 12px;
    padding: 8px;
}

.tool-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.tool-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    /* More space before footer */
    flex-grow: 1;
    line-height: 1.65;
}

.tool-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.category-tag {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    background: var(--accent-light);
    color: var(--accent);
}

.btn-visit {
    padding: 0.6rem 1.25rem;
    background: var(--accent);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-visit:hover {
    background: var(--accent-hover);
}

/* Load More Button */
.load-more-container {
    display: flex;
    justify-content: center;
    padding: 2rem 0 var(--section-spacing);
}

.btn-load-more {
    padding: 1rem 2.5rem;
    background: white;
    border: 2px solid var(--accent);
    color: var(--accent);
    font-weight: 700;
    font-size: 1rem;
    border-radius: 99px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.3s var(--transition);
}

.btn-load-more:hover {
    background: var(--accent);
    color: white;
    box-shadow: 0 10px 15px -3px rgba(99, 102, 241, 0.3);
    transform: translateY(-2px);
}

.btn-load-more svg {
    transition: transform 0.3s;
}

.btn-load-more:hover svg {
    transform: translateY(2px);
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .container {
        padding: 0 1.25rem;
    }

    .tool-grid {
        grid-template-columns: 1fr;
    }
}