/* === AI / Modern Theme === */
/* Font: Inter */
/* Tone: Informative & Straightforward */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;700;800&display=swap');

:root {
    --bg-primary: #0a0f1e;
    --bg-secondary: #121a33;
    --bg-tertiary: #1c2647;
    --text-primary: #e0e7ff;
    --text-secondary: #a0b3d7;
    --accent-primary: #38bdf8; /* Light Blue */
    --accent-secondary: #6366f1; /* Indigo */
    --border-color: #2a365f;
    --font-family: 'Inter', sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    line-height: 1.3;
    font-weight: 700;
    margin-bottom: 1rem;
}

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

p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

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

a:hover {
    color: #7dd3fc;
    text-decoration: underline;
}

ul {
    list-style: none;
}

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 0;
}

/* === HEADER & NAVIGATION === */
.site-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(18, 26, 51, 0.8);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

.site-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
}

.site-title a {
    color: inherit;
    text-decoration: none;
}

.main-nav ul {
    display: flex;
    gap: 1.5rem;
}

.main-nav a {
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    color: var(--text-secondary);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-primary);
    transition: width 0.3s ease;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--text-primary);
}

.main-nav a:hover::after,
.main-nav a.active::after {
    width: 100%;
}

/* === MAIN CONTENT & LAYOUT === */
.main-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
}

@media (min-width: 992px) {
    .main-layout {
        grid-template-columns: 3fr 1fr;
    }
}

main {
    flex: 1;
}

.intro-section {
    padding: 3rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

.intro-section h1 {
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

.intro-section .lead {
    font-size: 1.125rem;
    max-width: 700px;
    margin: 0 auto 2rem auto;
    color: var(--text-secondary);
}

/* === BLOG ARTICLES SECTION (HOMEPAGE) === */
.articles-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

@media (min-width: 768px) {
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1200px) {
    .articles-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.article-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.card-content {
    padding: 1.5rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-content h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.card-content h3 a {
    color: var(--text-primary);
}

.card-content p {
    font-size: 0.95rem;
    flex-grow: 1;
}

.read-more-link {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 500;
    color: var(--accent-primary);
}

.read-more-link:hover {
    text-decoration: underline;
}

/* === SIDEBAR === */
.sidebar {
    padding: 1.5rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.sidebar-widget {
    margin-bottom: 2.5rem;
}

.sidebar-widget:last-child {
    margin-bottom: 0;
}

.widget-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-secondary);
    display: inline-block;
}

.sidebar-widget ul li {
    margin-bottom: 1rem;
}

.sidebar-widget ul a {
    color: var(--text-secondary);
}

.sidebar-widget ul a:hover {
    color: var(--text-primary);
}

.promo-text {
    background-color: var(--bg-tertiary);
    padding: 1.5rem;
    border-radius: 6px;
    text-align: center;
    border-left: 4px solid var(--accent-primary);
}

/* === FOOTER === */
.site-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-content {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* === ARTICLE PAGE SPECIFIC STYLES === */
.article-header {
    text-align: center;
    padding-bottom: 2rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.article-meta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 1rem;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
}

.article-content h2 {
    margin-top: 2.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
    margin-top: 2rem;
}

.article-content ul {
    list-style: disc;
    padding-left: 20px;
    margin-bottom: 1.5rem;
}

.article-content ul li {
    margin-bottom: 0.5rem;
}

.article-content blockquote {
    border-left: 4px solid var(--accent-secondary);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-secondary);
}

.cta-section {
    background-color: var(--bg-tertiary);
    padding: 2rem;
    text-align: center;
    border-radius: 8px;
    margin-top: 3rem;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    font-weight: 700;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.cta-button:hover {
    transform: scale(1.05);
    color: #fff;
    text-decoration: none;
}

/* === OTHER STATIC PAGES (ABOUT, CONTACT, etc.) === */
.static-page-header {
    text-align: center;
    padding: 3rem 0;
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.static-page-content {
    padding: 3rem 0;
    max-width: 800px;
    margin: 0 auto;
}

.static-page-content h2 {
    margin-top: 2rem;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.75rem;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-family);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.3);
}

.contact-form button {
    align-self: flex-start;
    padding: 0.75rem 2rem;
    border-radius: 5px;
    border: none;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.contact-form button:hover {
    transform: scale(1.05);
}