/* ================================
   CSS VARIABLES & FOUNDATION
   ================================ */

:root {
    /* Grid System */
    --grid-columns: 24;
    --grid-gap: 1.5rem;
    --container-padding: 2rem;

    /* Typography */
    --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 1.2rem;
    --font-size-small: 0.95rem;
    --font-size-large: 1.4rem;
    --font-size-h1: 3.5rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 1.8rem;

    /* Line Heights */
    --line-height-base: 1.6;
    --line-height-heading: 1.2;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Transitions */
    --transition-speed: 300ms;
    --transition-easing: cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-Index */
    --z-header: 1000;
    --z-mobile-menu: 999;
    --z-scroll-top: 100;
}

/* Mobile Grid (8 columns) */
@media (max-width: 768px) {
    :root {
        --grid-columns: 8;
        --container-padding: 1.5rem;
        --font-size-h1: 2.5rem;
        --font-size-h2: 2rem;
        --font-size-h3: 1.5rem;
    }
}

/* ================================
   RESET & BASE STYLES
   ================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: background-color var(--transition-speed) var(--transition-easing),
                color var(--transition-speed) var(--transition-easing);
}

/* ================================
   LAYOUT & CONTAINER
   ================================ */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ================================
   HEADER & NAVIGATION
   ================================ */

.header {
    position: sticky;
    top: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem 0;
    z-index: var(--z-header);
    transition: background-color var(--transition-speed) var(--transition-easing);
}

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

.logo {
    font-size: var(--font-size-large);
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    transition: opacity var(--transition-speed);
}

.logo:hover {
    opacity: 0.7;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    position: relative;
    transition: opacity var(--transition-speed);
}

.nav-links a:hover {
    opacity: 0.7;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.theme-toggle,
.lang-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: var(--font-size-small);
    color: var(--color-text);
    transition: all var(--transition-speed);
}

.theme-toggle:hover,
.lang-toggle:hover {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: all var(--transition-speed);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 2rem;
    flex-direction: column;
    gap: 1.5rem;
    z-index: var(--z-mobile-menu);
    opacity: 0;
    transform: translateY(-20px);
    transition: all var(--transition-speed) var(--transition-easing);
}

.mobile-menu.active {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

.mobile-menu a {
    color: var(--color-text);
    text-decoration: none;
    font-size: var(--font-size-large);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hamburger {
        display: flex;
    }
}

/* ================================
   HERO SECTION
   ================================ */

.hero {
    padding: var(--spacing-xl) 0;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.hero-content {
    max-width: 900px;
}

.hero-title {
    font-size: var(--font-size-h1);
    line-height: var(--line-height-heading);
    font-weight: 400;
    margin-bottom: var(--spacing-lg);
}

.hero-title .highlight {
    display: block;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    font-size: var(--font-size-large);
}

.hero-description .emphasis {
    color: var(--color-text-muted);
}

/* Typewriter Effect Styles */
.typewriter-container {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.typewriter {
    display: inline-block;
    min-width: 20px;
}

.cursor {
    display: inline-block;
    animation: blink 1s step-end infinite;
    margin-left: 2px;
    font-weight: 400;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-lg) 0;
        min-height: 50vh;
    }
}

/* ================================
   MARQUEE
   ================================ */

.marquee-container {
    overflow: hidden;
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 1.5rem 0;
    margin: var(--spacing-xl) 0;
}

.marquee {
    display: flex;
    animation: marquee 30s linear infinite;
    white-space: nowrap;
}

.marquee-item {
    padding: 0 3rem;
    font-size: var(--font-size-large);
    font-weight: 500;
    color: var(--color-text-muted);
}

@keyframes marquee {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(-50%);
    }
}

/* ================================
   SECTIONS
   ================================ */

.featured-section,
.articles-section,
.about-section {
    padding: var(--spacing-xl) 0;
}

.section-title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

/* ================================
   FEATURED ARTICLES GRID
   ================================ */

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.featured-article {
    position: relative;
}

.article-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-image {
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    border-radius: 8px;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 16 / 10;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-speed) var(--transition-easing);
}

.featured-article:hover .image-placeholder {
    transform: scale(1.05);
}

.article-number {
    font-size: 4rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.9);
}

.article-content {
    padding: var(--spacing-sm) 0;
}

.article-title {
    font-size: var(--font-size-h3);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.article-excerpt {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
}

.article-category {
    padding: 0.25rem 0.75rem;
    background-color: var(--color-accent-light);
    border-radius: 20px;
}

@media (max-width: 768px) {
    .featured-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
}

/* ================================
   ARTICLES GRID
   ================================ */

.articles-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.article-card {
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    transition: all var(--transition-speed) var(--transition-easing);
}

.article-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.article-card a {
    text-decoration: none;
    color: inherit;
}

.card-title {
    font-size: var(--font-size-large);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.card-excerpt {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-small);
}

.card-date {
    font-size: var(--font-size-small);
    color: var(--color-text-muted);
}

@media (max-width: 768px) {
    .articles-grid {
        grid-template-columns: 1fr;
    }
}

/* ================================
   ABOUT SECTION
   ================================ */

.about-section {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.about-text {
    font-size: var(--font-size-h2);
    color: var(--color-text-muted);
}

/* ================================
   ABOUT PAGE
   ================================ */

.about-page {
    padding: var(--spacing-xl) 0;
    min-height: 70vh;
}

.about-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.about-layout:last-child {
    margin-bottom: 0;
}

.about-text-content {
    max-width: 600px;
}

.about-page-title {
    font-size: var(--font-size-h1);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text);
}

.about-section-title {
    font-size: var(--font-size-h2);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.about-intro {
    font-size: var(--font-size-large);
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.about-paragraph {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-image-content {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-photo {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
    object-fit: cover;
}

@media (max-width: 768px) {
    .about-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }

    .about-text-content {
        order: 2;
    }

    .about-image-content {
        order: 1;
    }

    .about-photo {
        max-width: 100%;
    }
}

/* ================================
   FOOTER
   ================================ */

.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.footer-nav {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

.footer-nav a {
    color: var(--color-text);
    text-decoration: none;
    transition: opacity var(--transition-speed);
}

.footer-nav a:hover {
    opacity: 0.7;
}

.footer-contact {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.footer-contact a {
    color: var(--color-text-muted);
    text-decoration: none;
    transition: color var(--transition-speed);
}

.footer-contact a:hover {
    color: var(--color-accent);
}

.footer-copyright {
    text-align: center;
    color: var(--color-text-muted);
    font-size: var(--font-size-small);
}

/* ================================
   SCROLL TO TOP BUTTON
   ================================ */

.scroll-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--color-accent);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-speed) var(--transition-easing);
    z-index: var(--z-scroll-top);
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    transform: translateY(-4px);
}

/* ================================
   UTILITY CLASSES
   ================================ */

.text-center {
    text-align: center;
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}