/* ClearNest - Home Cleaning & Decluttering Website */
/* Color Palette: Mint #20C6B7, Soft Gray #A7B0BD, Graphite #1A2230, White #FFFFFF, Accent Blue #3AA7FF */

:root {
    --color-mint: #20C6B7;
    --color-soft-gray: #A7B0BD;
    --color-graphite: #1A2230;
    --color-white: #FFFFFF;
    --color-accent-blue: #3AA7FF;
    
    --font-system: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    --shadow-card: 0 12px 28px rgba(0, 0, 0, 0.18);
    --border-radius: 16px;
    --transition: all 160ms ease;
    
    --container-max-width: 1200px;
    --grid-columns: 12;
    --grid-gutter: 20px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-system);
    line-height: 1.6;
    color: var(--color-graphite);
    background-color: var(--color-white);
    font-size: 1rem;
}

/* Container and Grid System */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--grid-gutter);
}

.grid {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: var(--grid-gutter);
}

/* Typography */
h1 {
    font-size: 3.1rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h2 {
    font-size: 2.25rem;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h3 {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
}

h4 {
    font-size: 1.2rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: var(--spacing-xs);
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--color-white);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--color-mint);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    text-decoration: none;
    color: var(--color-graphite);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-mint);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-mint);
}

.burger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.burger span {
    width: 25px;
    height: 3px;
    background: var(--color-graphite);
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-mint) 0%, var(--color-accent-blue) 100%);
    color: var(--color-white);
    padding: calc(80px + var(--spacing-xxl)) 0 var(--spacing-xxl);
    text-align: center;
}

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

.hero h1 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background: var(--color-white);
    color: var(--color-mint);
    padding: var(--spacing-sm) var(--spacing-lg);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-card);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 36px rgba(0,0,0,0.22);
}

/* Cards */
.card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-card);
    transition: var(--transition);
    height: 100%;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 36px rgba(0,0,0,0.22);
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: calc(var(--border-radius) / 2);
    margin-bottom: var(--spacing-sm);
}

.card h3 {
    color: var(--color-graphite);
    margin-bottom: var(--spacing-sm);
}

.card p {
    color: var(--color-soft-gray);
    margin-bottom: var(--spacing-sm);
}

/* Stats Section */
.stats {
    background: var(--color-graphite);
    color: var(--color-white);
    padding: var(--spacing-xxl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    text-align: center;
}

.stat-item h3 {
    font-size: 2.5rem;
    color: var(--color-mint);
    margin-bottom: var(--spacing-xs);
}

.stat-item p {
    opacity: 0.8;
}

/* Grid Layouts */
.featured-articles,
.popular-articles,
.latest-articles {
    padding: var(--spacing-xxl) 0;
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

/* Filter Chips */
.filter-chips {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin: var(--spacing-lg) 0;
    justify-content: center;
}

.chip {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-white);
    border: 2px solid var(--color-soft-gray);
    border-radius: 25px;
    text-decoration: none;
    color: var(--color-graphite);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
}

.chip:hover,
.chip.active {
    background: var(--color-mint);
    border-color: var(--color-mint);
    color: var(--color-white);
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 8px;
    background: var(--color-accent-blue);
    color: var(--color-white);
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.badge.beginner {
    background: var(--color-mint);
}

.badge.printable {
    background: var(--color-soft-gray);
}

.badge.time-15 {
    background: var(--color-graphite);
}

/* Categories Section */
.categories {
    background: #f8f9fa;
    padding: var(--spacing-xxl) 0;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.category-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
}

.category-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

/* Advantages Section */
.advantages {
    padding: var(--spacing-xxl) 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.advantage-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
}

.advantage-icon {
    width: 48px;
    height: 48px;
    background: var(--color-mint);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

/* Reviews Section */
.reviews {
    background: var(--color-graphite);
    color: var(--color-white);
    padding: var(--spacing-xxl) 0;
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.review-card {
    background: rgba(255, 255, 255, 0.1);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
}

.review-author {
    font-weight: 600;
    color: var(--color-mint);
    margin-top: var(--spacing-sm);
}

/* Newsletter Section */
.newsletter {
    background: linear-gradient(135deg, var(--color-mint) 0%, var(--color-accent-blue) 100%);
    color: var(--color-white);
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.newsletter-form {
    max-width: 500px;
    margin: var(--spacing-lg) auto 0;
    display: flex;
    gap: var(--spacing-sm);
}

.newsletter-input {
    flex: 1;
    padding: var(--spacing-sm);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

.newsletter-button {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-white);
    color: var(--color-mint);
    border: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.newsletter-button:hover {
    transform: translateY(-1px);
}

.success-message {
    display: none;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--border-radius);
}

/* Footer */
.footer {
    background: var(--color-graphite);
    color: var(--color-white);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    color: var(--color-mint);
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--color-white);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--color-mint);
    color: var(--color-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    z-index: 999;
}

.back-to-top:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-card);
}

/* Preloader */
.preloader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 300ms ease;
}

.preloader.hidden {
    opacity: 0;
    pointer-events: none;
}

.preloader-icon {
    width: 60px;
    height: 60px;
    position: relative;
}

.checkmark {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: block;
    stroke-width: 3;
    stroke: var(--color-mint);
    stroke-miterlimit: 10;
    box-shadow: inset 0px 0px 0px var(--color-mint);
    animation: fill 0.4s ease-in-out 0.4s forwards, scale 0.3s ease-in-out 0.9s both;
}

.checkmark-circle {
    stroke-dasharray: 166;
    stroke-dashoffset: 166;
    stroke-width: 3;
    stroke-miterlimit: 10;
    stroke: var(--color-mint);
    animation: stroke 0.6s cubic-bezier(0.65, 0, 0.45, 1) forwards;
}

.checkmark-check {
    transform-origin: 50% 50%;
    stroke-dasharray: 48;
    stroke-dashoffset: 48;
    animation: stroke 0.3s cubic-bezier(0.65, 0, 0.45, 1) 0.8s forwards;
}

@keyframes stroke {
    100% {
        stroke-dashoffset: 0;
    }
}

@keyframes scale {
    0%, 100% {
        transform: none;
    }
    50% {
        transform: scale3d(1.1, 1.1, 1);
    }
}

@keyframes fill {
    100% {
        box-shadow: inset 0px 0px 0px 30px var(--color-mint);
    }
}

/* Scroll Reveal Animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Focus States for Accessibility */
*:focus {
    outline: 2px solid var(--color-mint);
    outline-offset: 2px;
}

button:focus,
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--color-mint);
    outline-offset: 2px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--color-white);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--spacing-xxl);
        transition: var(--transition);
        box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .burger {
        display: flex;
    }
    
    .burger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .burger.active span:nth-child(2) {
        opacity: 0;
    }
    
    .burger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    h1 {
        font-size: 2.25rem;
    }
    
    h2 {
        font-size: 1.8rem;
    }
    
    .hero {
        padding: calc(80px + var(--spacing-lg)) 0 var(--spacing-lg);
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --grid-gutter: 16px;
    }
    
    .container {
        padding: 0 16px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    .filter-chips {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: var(--spacing-xs);
    }
}

/* Print Styles */
@media print {
    .header,
    .burger,
    .back-to-top,
    .preloader {
        display: none;
    }
    
    .hero {
        padding-top: var(--spacing-lg);
    }
    
    .card {
        break-inside: avoid;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .preloader {
        display: none;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-soft-gray: #666666;
        --shadow-card: 0 4px 8px rgba(0, 0, 0, 0.5);
    }
}