/* ===================================
   CSS Variables - Professional Blog Theme
   =================================== */
:root {
    /* Primary Colors - Tech Blog Theme */
    --primary-blue: #2563eb;
    --primary-purple: #7c3aed;
    --accent-orange: #f59e0b;
    --accent-pink: #ec4899;
    
    /* Neutral Colors */
    --white: #ffffff;
    --off-white: #f9fafb;
    --light-gray: #e5e7eb;
    --medium-gray: #6b7280;
    --dark-gray: #1f2937;
    --black: #111827;
    
    /* Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --gradient-accent: linear-gradient(135deg, #f59e0b 0%, #ec4899 100%);
    --gradient-hero: linear-gradient(135deg, rgba(37, 99, 235, 0.95) 0%, rgba(124, 58, 237, 0.95) 100%);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
    
    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--dark-gray);
    line-height: 1.7;
    background-color: var(--off-white);
    overflow-x: hidden;
}

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

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition-normal);
}

ul {
    list-style: none;
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

section {
    padding: var(--spacing-3xl) 0;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-blue);
}

.brand-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-orange);
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--dark-gray);
    position: relative;
    padding: var(--spacing-xs) 0;
    font-size: 0.95rem;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition-normal);
}

.nav-link:hover::after {
    width: 100%;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.mobile-toggle svg {
    width: 28px;
    height: 28px;
    color: var(--primary-blue);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    z-index: -1;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.2) 0%, transparent 70%);
    border-radius: 50%;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
    color: var(--white);
}

.title-line {
    display: block;
    animation: slideUp 0.8s ease-out forwards;
    opacity: 0;
}

.title-line:nth-child(1) {
    animation-delay: 0.2s;
}

.title-line:nth-child(2) {
    animation-delay: 0.4s;
}

.title-line.highlight {
    background: linear-gradient(135deg, var(--accent-orange) 0%, var(--accent-pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
    animation: fadeIn 1s ease-out 0.6s forwards;
    opacity: 0;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
    animation: fadeIn 1s ease-out 0.8s forwards;
    opacity: 0;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    animation: fadeIn 1s ease-out 1s forwards;
    opacity: 0;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--white);
}

.stat-item svg {
    width: 40px;
    height: 40px;
    color: var(--accent-orange);
}

.stat-content {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
}

.stat-label {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    border: none;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn span,
.btn svg {
    position: relative;
    z-index: 1;
}

.btn svg {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-normal);
}

.btn:hover svg {
    transform: translateX(4px);
}

.btn-primary {
    background: var(--gradient-accent);
    color: var(--white);
    box-shadow: 0 4px 16px rgba(245, 158, 11, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 24px rgba(245, 158, 11, 0.4);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

/* ===================================
   Section Headers
   =================================== */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(124, 58, 237, 0.1) 100%);
    color: var(--primary-blue);
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    color: var(--black);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.section-description {
    font-size: 1.125rem;
    color: var(--medium-gray);
    line-height: 1.8;
}

/* ===================================
   Featured Post
   =================================== */
.featured-post {
    background: var(--white);
    padding: var(--spacing-3xl) 0;
}

.featured-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    background: var(--gradient-accent);
    color: var(--white);
    border-radius: var(--radius-xl);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.featured-badge svg {
    width: 16px;
    height: 16px;
}

.featured-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    background: var(--off-white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.featured-image {
    height: 100%;
    min-height: 400px;
}

.image-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-placeholder svg {
    width: 80px;
    height: 80px;
    color: rgba(255, 255, 255, 0.8);
}

.featured-text {
    padding: var(--spacing-2xl);
}

.post-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.875rem;
}

.category {
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary-blue);
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.date {
    color: var(--medium-gray);
}

.featured-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--black);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.featured-excerpt {
    font-size: 1.125rem;
    color: var(--medium-gray);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--primary-blue);
    font-weight: 600;
    transition: var(--transition-normal);
}

.read-more svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-normal);
}

.read-more:hover {
    color: var(--primary-purple);
}

.read-more:hover svg {
    transform: translateX(4px);
}

/* ===================================
   Latest Posts
   =================================== */
.latest-posts {
    background: var(--off-white);
}

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.post-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    cursor: pointer;
}

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

.post-image {
    position: relative;
    height: 220px;
    overflow: hidden;
}

.post-image .image-placeholder {
    transition: transform var(--transition-slow);
}

.post-card:hover .post-image .image-placeholder {
    transform: scale(1.1);
}

.post-image .image-placeholder svg {
    width: 60px;
    height: 60px;
}

.post-category {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-md);
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-blue);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.post-content {
    padding: var(--spacing-lg);
}

.post-content .post-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 0.8125rem;
    color: var(--medium-gray);
}

.post-content .post-meta span {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.post-content .post-meta svg {
    width: 14px;
    height: 14px;
}

.post-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.post-excerpt {
    font-size: 0.9375rem;
    color: var(--medium-gray);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.post-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--primary-blue);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition-normal);
}

.post-link svg {
    width: 16px;
    height: 16px;
    transition: transform var(--transition-normal);
}

.post-link:hover {
    color: var(--primary-purple);
}

.post-link:hover svg {
    transform: translateX(4px);
}

/* ===================================
   Categories
   =================================== */
.categories {
    background: var(--white);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.category-card {
    background: var(--off-white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.category-card:hover {
    background: var(--white);
    border-color: var(--primary-blue);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.category-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.category-icon svg {
    width: 32px;
    height: 32px;
    color: var(--white);
}

.category-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-xs);
}

.category-count {
    font-size: 0.9375rem;
    color: var(--medium-gray);
}

/* ===================================
   About Section
   =================================== */
.about {
    background: var(--off-white);
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
}

.about-text {
    font-size: 1.125rem;
    color: var(--medium-gray);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

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

.about-feature {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.about-feature svg {
    width: 32px;
    height: 32px;
    color: var(--accent-orange);
    flex-shrink: 0;
    margin-top: 4px;
}

.about-feature h4 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--black);
    margin-bottom: var(--spacing-xs);
}

.about-feature p {
    color: var(--medium-gray);
    line-height: 1.6;
}

.about-visual {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.visual-card {
    background: var(--gradient-primary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--white);
    transition: transform var(--transition-normal);
}

.visual-card:hover {
    transform: translateY(-8px);
}

.visual-card:nth-child(3) {
    grid-column: 1 / -1;
}

.visual-card svg {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-md);
}

.visual-card h3 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: var(--spacing-xs);
}

.visual-card p {
    font-size: 0.875rem;
    opacity: 0.9;
}

/* ===================================
   Newsletter
   =================================== */
.newsletter {
    background: var(--gradient-primary);
    padding: var(--spacing-3xl) 0;
}

.newsletter-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.newsletter-icon {
    width: 64px;
    height: 64px;
    color: var(--accent-orange);
    margin: 0 auto var(--spacing-lg);
}

.newsletter-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: var(--spacing-md);
}

.newsletter-description {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.newsletter-form input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.1);
    color: var(--white);
    font-family: var(--font-primary);
    font-size: 1rem;
    backdrop-filter: blur(10px);
}

.newsletter-form input::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.newsletter-form input:focus {
    outline: none;
    border-color: rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.15);
}

.newsletter-note {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.8);
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--black);
    color: var(--white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
}

.footer-logo svg {
    width: 32px;
    height: 32px;
    color: var(--accent-orange);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
}

.social-links a:hover {
    background: var(--accent-orange);
    transform: translateY(-4px);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

.footer-links h4 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-normal);
    font-size: 0.9375rem;
}

.footer-links a:hover {
    color: var(--accent-orange);
    padding-left: var(--spacing-xs);
}

.footer-bottom {
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 72px);
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-lg);
        transition: left var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .featured-content,
    .about-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-xl);
    }
    
    .footer-brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 640px) {
    :root {
        --spacing-3xl: 3rem;
    }
    
    .hero-buttons,
    .newsletter-form {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .posts-grid,
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .about-visual {
        grid-template-columns: 1fr;
    }
    
    .visual-card:nth-child(3) {
        grid-column: 1;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Print Styles
   =================================== */
@media print {
    @page {
        margin: 2cm;
        @top-center {
            content: "TechDaily | Your Daily Dose of Technology News";
        }
        @bottom-center {
            content: "Created by Helium";
        }
    }
    
    body {
        print-color-adjust: exact;
        -webkit-print-color-adjust: exact;
    }
    
    .navbar,
    .mobile-toggle,
    .hero-buttons,
    .newsletter-form {
        display: none;
    }
}

/* ===================================
   Accessibility
   =================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

:focus-visible {
    outline: 3px solid var(--accent-orange);
    outline-offset: 2px;
}