/* --- CSS Design System: Variables --- */
:root {
    --color-background: #101115;
    --color-surface: #1B1D24;
    --color-primary: #a855f7; /* Purple */
    --color-primary-light: #c084fc;
    --color-secondary: #ec4899; /* Pink */
    --color-text-main: #F4F4F5;
    --color-text-muted: #A1A1AA;
    --color-border: rgba(168, 85, 247, 0.2);
    --color-shadow: rgba(168, 85, 247, 0.1);

    --font-primary: 'Poppins', sans-serif;
    --border-radius-md: 12px;
    --border-radius-full: 999px;
    --shadow-glow: 0 0 20px var(--color-shadow);
    --shadow-card: 0 4px 10px rgba(0, 0, 0, 0.2);
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-background);
    color: var(--color-text-main);
    font-family: var(--font-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 90%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
}

/* --- Header --- */
.site-header {
    text-align: center;
    padding: 4rem 1rem;
    background: var(--color-background) url('data:image/svg+xml,...') no-repeat center center; /* Optional subtle BG pattern */
    position: relative;
    overflow: hidden;
}

.site-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 700px;
    height: 700px;
    background-image: radial-gradient(circle, var(--color-primary) 0%, transparent 60%);
    opacity: 0.15;
    filter: blur(100px);
    pointer-events: none;
}

.logo-heading {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    color: var(--color-text-main);
    margin-bottom: 0.5rem;
}

.subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
}

.search-wrapper {
    position: relative;
    max-width: 600px;
    margin: 0 auto;
}

.search-icon {
    position: absolute;
    top: 50%;
    left: 1.25rem;
    transform: translateY(-50%);
    color: var(--color-text-muted);
}

#search {
    width: 100%;
    padding: 1rem 1rem 1rem 3.5rem;
    font-size: 1rem;
    font-family: var(--font-primary);
    border-radius: var(--border-radius-full);
    border: 1px solid var(--color-border);
    background-color: rgba(27, 29, 36, 0.7);
    color: var(--color-text-main);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

#search::placeholder {
    color: var(--color-text-muted);
}

#search:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: var(--shadow-glow);
}

/* --- Category Navigation --- */
.category-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 3rem;
}

.category-nav button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: transparent;
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    padding: 0.6rem 1.25rem;
    border-radius: var(--border-radius-full);
    font-weight: 500;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.category-nav button:hover {
    color: var(--color-text-main);
    background-color: var(--color-surface);
}

.category-nav button.active {
    color: #fff;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-color: transparent;
    box-shadow: 0 0 15px rgba(236, 72, 153, 0.4);
}

/* --- Tool Grid & Cards --- */
#tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    padding-bottom: 4rem;
}

.tool-card {
    background-color: var(--color-surface);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--color-border);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-card);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    animation: fadeIn 0.5s ease forwards;
}

.tool-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-glow);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.tool-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-main);
}

.card-icon {
    font-size: 1.5rem;
    color: var(--color-primary-light);
}

.tool-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    flex-grow: 1;
    margin-bottom: 1.5rem;
}

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

.tool-category-tag {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-primary-light);
    background-color: rgba(168, 85, 247, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: var(--border-radius-full);
}

.tool-link {
    text-decoration: none;
    color: var(--color-background);
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    padding: 0.6rem 1.25rem;
    border-radius: var(--border-radius-full);
    font-weight: 600;
    transition: transform 0.2s ease, box-shadow 0.3s ease;
}

.tool-link:hover {
    transform: scale(1.05);
    box-shadow: 0 0 15px rgba(236, 72, 153, 0.5);
}

/* --- Footer --- */
.site-footer-bottom {
    text-align: center;
    padding: 2rem 1rem;
    background-color: #000;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-top: auto;
    border-top: 1px solid var(--color-border);
}

/* --- Animations --- */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.no-results {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 1.2rem;
    padding: 4rem 0;
}