/*
 * Facts for Kids - Main Stylesheet
 * A fast, visually appealing theme with zero bloat.
 */

:root {
    /* Colors */
    --color-primary: #4CAF50;
    /* Animals / Growth / Nature */
    --color-secondary: #2196F3;
    /* Space / Depth / Calm */
    --color-accent: #FF9800;
    /* History / Energy / Fun */
    --color-danger: #F44336;

    --color-bg: #F0F4F8;
    /* Soft background */
    --color-text: #334155;
    --color-text-light: #64748B;
    --color-heading: #1E293B;

    --color-card-bg: rgba(255, 255, 255, 0.85);

    /* Typography */
    --font-primary: 'Nunito', system-ui, -apple-system, sans-serif;

    /* Shadows & Effects */
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.15), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    --border-radius: 24px;
    --border-radius-pill: 50px;

    /* Layout */
    --container-width: 1200px;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    font-size: 18px;
    /* Subtle, fun background pattern */
    background-image: radial-gradient(var(--color-secondary) 0.5px, transparent 0.5px), radial-gradient(var(--color-primary) 0.5px, transparent 0.5px);
    background-size: 50px 50px;
    background-position: 0 0, 25px 25px;
    background-attachment: fixed;
    /* Lower opacity on the dots so it is subtle */
    background-color: var(--color-bg);
    position: relative;
}

body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: inherit;
    opacity: 0.1;
    z-index: -1;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--color-heading);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: all 0.3s ease;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
    border-radius: calc(var(--border-radius) / 2);
}

/* Layout */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    background: rgba(255, 255, 255, 0.90);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    border-bottom: 2px solid rgba(255, 255, 255, 0.5);
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-branding {
    display: flex;
    align-items: center;
    gap: 15px;
}

.site-title {
    font-size: 2rem;
    margin: 0;
    font-weight: 900;
    letter-spacing: -0.5px;
}

.site-title a {
    color: var(--color-heading);
}

.site-description {
    font-size: 1rem;
    color: var(--color-primary);
    font-weight: 800;
    background: rgba(76, 175, 80, 0.1);
    padding: 4px 12px;
    border-radius: var(--border-radius-pill);
}

/* Navigation */
.main-navigation ul {
    list-style: none;
    display: flex;
    gap: 20px;
}

.main-navigation a {
    color: var(--color-text);
    font-weight: 700;
    font-size: 1.1rem;
    padding: 10px 20px;
    border-radius: var(--border-radius-pill);
    transition: all 0.2s ease;
}

.main-navigation a:hover,
.main-navigation .current-menu-item>a {
    background: var(--color-secondary);
    color: white;
    box-shadow: 0 4px 10px rgba(33, 150, 243, 0.3);
    transform: translateY(-2px);
}

/* Buttons */
.btn,
.button {
    display: inline-block;
    background: var(--color-secondary);
    color: white;
    padding: 14px 32px;
    border-radius: var(--border-radius-pill);
    font-weight: 800;
    font-size: 1.1rem;
    border: none;
    cursor: pointer;
    box-shadow: 0 4px 0px rgba(0, 0, 0, 0.1);
    transform: translateY(0);
    transition: all 0.2s ease;
    text-align: center;
}

.btn:hover,
.button:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 6px 0px rgba(0, 0, 0, 0.1);
    color: white;
}

.btn:active,
.button:active {
    transform: translateY(4px);
    box-shadow: none;
}

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

.btn-accent:hover {
    background: #F57C00;
}

/* Cards (Glassmorphism effect) */
.fact-card {
    background: var(--color-card-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: 35px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    border: 2px solid rgba(255, 255, 255, 0.8);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.fact-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-hover);
    border-color: white;
}

.fact-card-title {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.fact-card-meta {
    font-size: 0.9rem;
    color: var(--color-text-light);
    font-weight: 600;
    margin-bottom: 20px;
}

/* Post Content */
.post-content {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    border: 2px solid rgba(0, 0, 0, 0.03);
}

.post-content p {
    margin-bottom: 1.5rem;
}

/* Grids */
.grid-cols-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.grid-cols-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.grid-cols-4 {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

/* Category Tags */
.cat-tag {
    display: inline-block;
    padding: 6px 14px;
    border-radius: var(--border-radius-pill);
    font-size: 0.8rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-right: 8px;
    margin-bottom: 10px;
}

.cat-tag.science {
    background: var(--color-secondary);
    color: white;
}

.cat-tag.animals {
    background: var(--color-primary);
    color: white;
}

.cat-tag.history {
    background: var(--color-accent);
    color: white;
}

/* Utilities */
.text-center {
    text-align: center;
}

.mt-4 {
    margin-top: 2rem;
}

.mb-4 {
    margin-bottom: 2rem;
}

.py-5 {
    padding-top: 4rem;
    padding-bottom: 4rem;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
}

/* Footer */
.site-footer {
    background: var(--color-heading);
    color: white;
    padding: 60px 0 20px;
    margin-top: 80px;
    border-radius: 40px 40px 0 0;
}

.site-footer a {
    color: #94a3b8;
}

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

.footer-credits {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    font-weight: 600;
}

/* Responsive */
@media (max-width: 992px) {

    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    .site-header .container {
        flex-direction: column;
        gap: 20px;
    }

    .site-branding {
        flex-direction: column;
        text-align: center;
        gap: 10px;
    }

    .main-navigation ul {
        flex-wrap: wrap;
        justify-content: center;
    }

    .post-content {
        padding: 25px;
    }
}

@media (max-width: 480px) {

    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .fact-card {
        padding: 25px;
    }
}