/* ========================================
   GLOBAL STYLES & RESET
   ======================================== */

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

:root {
    /* Color Palette - Educational & Professional */
    --primary-color: #1a365d;
    --secondary-color: #2c5282;
    --accent-color: #d69e2e;
    --accent-light: #faf089;
    --text-dark: #1a202c;
    --text-medium: #4a5568;
    --text-light: #718096;
    --bg-light: #f7fafc;
    --bg-white: #ffffff;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Playfair Display', Georgia, serif;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    line-height: 1.7;
    background-color: var(--bg-light);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========================================
   NAVIGATION
   ======================================== */

.navbar {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

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

.nav-brand h1 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.nav-brand .tagline {
    font-size: 0.85rem;
    opacity: 0.9;
    font-weight: 300;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 4px;
}

.nav-menu a:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

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

.hero {
    position: relative;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 6rem 0;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(255,255,255,.05) 35px, rgba(255,255,255,.05) 70px);
    opacity: 0.4;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at top right, rgba(255,255,255,0.1), transparent);
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.feature-badge {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    background: rgba(255, 255, 255, 0.15);
    padding: 1rem 1.5rem;
    border-radius: 50px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.feature-badge:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
}

.feature-badge .icon {
    font-size: 1.5rem;
}

/* ========================================
   SECTION HEADERS
   ======================================== */

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.1rem;
    color: var(--text-medium);
    max-width: 700px;
    margin: 0 auto;
}

/* ========================================
   ARTICLES SECTION
   ======================================== */

.articles-section {
    padding: 6rem 0;
    background-color: var(--bg-white);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
}

.article-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

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

.article-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.3s ease;
}

.article-card:hover .article-image img {
    transform: scale(1.05);
}

.article-content {
    padding: 1.5rem;
}

.article-category {
    display: inline-block;
    background-color: var(--accent-light);
    color: var(--text-dark);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.article-card h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    line-height: 1.3;
}

.article-excerpt {
    color: var(--text-medium);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.article-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease;
    color: var(--text-dark);
}

.article-body.expanded {
    max-height: 5000px;
}

.article-body h4 {
    color: var(--secondary-color);
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    font-size: 1.2rem;
}

.article-body p {
    margin-bottom: 1rem;
}

.article-body ul {
    margin: 1rem 0 1rem 1.5rem;
}

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

.article-body a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease;
}

.article-body a:hover {
    border-bottom-color: var(--accent-color);
}

.read-more-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
    width: 100%;
}

.read-more-btn:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
}

/* ========================================
   INFOGRAPHICS SECTION
   ======================================== */

.infographics-section {
    padding: 6rem 0;
    background-color: var(--bg-light);
}

.infographics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.infographic-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.infographic-card.full-width {
    grid-column: 1 / -1;
}

.infographic-card h3 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.infographic-content {
    margin-top: 1rem;
}

/* Jacket Anatomy Diagram */
.anatomy-diagram {
    position: relative;
}

.diagram-container {
    position: relative;
    min-height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.jacket-outline {
    width: 280px;
    height: 380px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 15px 15px 5px 5px;
    position: relative;
    box-shadow: var(--shadow-lg);
}

.jacket-outline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 15px;
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 15px 15px 0 0;
}

.annotation {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.annotation .dot {
    width: 12px;
    height: 12px;
    background-color: var(--accent-color);
    border-radius: 50%;
    border: 2px solid white;
    box-shadow: 0 0 0 3px var(--accent-color);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 3px var(--accent-color); }
    50% { box-shadow: 0 0 0 6px rgba(214, 158, 46, 0.3); }
}

.annotation .label {
    background: white;
    padding: 0.5rem 0.8rem;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-dark);
    box-shadow: var(--shadow-sm);
    white-space: nowrap;
    display: flex;
    flex-direction: column;
}

.annotation .detail {
    font-weight: 400;
    font-size: 0.75rem;
    color: var(--text-light);
    margin-top: 0.2rem;
}

.collar-annotation {
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
}

.chest-annotation {
    top: 80px;
    left: -200px;
}

.body-annotation {
    top: 180px;
    left: -180px;
}

.sleeve-annotation {
    top: 120px;
    right: -190px;
}

.pocket-annotation {
    top: 240px;
    right: -170px;
}

.cuff-annotation {
    bottom: 30px;
    right: -160px;
}

.button-annotation {
    top: 200px;
    left: -170px;
}

/* Material Comparison Table */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
}

.comparison-table thead {
    background-color: var(--primary-color);
    color: white;
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    font-weight: 600;
    font-size: 0.9rem;
}

.comparison-table td {
    font-size: 0.95rem;
}

.rating-bar {
    width: 100%;
    height: 20px;
    background-color: var(--bg-light);
    border-radius: 10px;
    overflow: hidden;
    position: relative;
}

.rating-bar .fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-light));
    border-radius: 10px;
    transition: width 1s ease;
}

/* Timeline */
.timeline {
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-color), var(--accent-color));
    transform: translateX(-50%);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 3rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-year {
    flex: 0 0 120px;
    text-align: center;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    background: white;
    padding: 0.5rem 1rem;
    border-radius: 30px;
    border: 3px solid var(--accent-color);
    position: relative;
    z-index: 2;
}

.timeline-content {
    flex: 1;
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    margin: 0 2rem;
}

.timeline-content h4 {
    color: var(--secondary-color);
    margin-bottom: 0.5rem;
}

.timeline-content p {
    color: var(--text-medium);
    font-size: 0.95rem;
}

/* ========================================
   FAQ SECTION
   ======================================== */

.faq-section {
    padding: 6rem 0;
    background-color: var(--bg-white);
}

.faq-grid {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item:hover {
    border-color: var(--accent-color);
}

.faq-question {
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    padding: 1.3rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background-color: var(--bg-light);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--accent-color);
    transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s ease, padding 0.5s ease;
    padding: 0 1.5rem;
}

.faq-item.active .faq-answer {
    max-height: 1000px;
    padding: 0 1.5rem 1.5rem 1.5rem;
}

.faq-answer p {
    color: var(--text-medium);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.faq-answer ul {
    margin: 1rem 0 1rem 1.5rem;
}

.faq-answer li {
    margin-bottom: 0.5rem;
    color: var(--text-medium);
}

.faq-answer a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: border-color 0.3s ease;
}

.faq-answer a:hover {
    border-bottom-color: var(--accent-color);
}

/* ========================================
   BRANDS SECTION
   ======================================== */

.brands-section {
    padding: 6rem 0;
    background-color: var(--bg-light);
}

.brands-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.brand-card {
    background: white;
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    position: relative;
    transition: all 0.3s ease;
}

.brand-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.brand-card.featured {
    grid-column: 1 / -1;
    border: 3px solid var(--accent-color);
    background: linear-gradient(135deg, #fff 0%, #fffbf0 100%);
}

.featured-badge {
    position: absolute;
    top: -12px;
    right: 20px;
    background: linear-gradient(135deg, var(--accent-color), #ed8936);
    color: white;
    padding: 0.4rem 1.2rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.85rem;
    box-shadow: var(--shadow-md);
}

.brand-card h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.brand-rating {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.stars {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.score {
    color: var(--text-medium);
    font-weight: 600;
}

.brand-description {
    color: var(--text-medium);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.brand-features h4 {
    color: var(--secondary-color);
    margin-bottom: 0.8rem;
    font-size: 1.1rem;
}

.brand-features ul {
    list-style: none;
    margin-bottom: 1.5rem;
}

.brand-features li {
    padding: 0.5rem 0;
    color: var(--text-dark);
}

.brand-specialties {
    background-color: var(--bg-light);
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1.5rem;
    color: var(--text-medium);
}

.brand-note {
    background-color: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 1rem;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.brand-link {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.brand-link.primary {
    background-color: var(--accent-color);
    color: white;
}

.brand-link.primary:hover {
    background-color: #ed8936;
    transform: translateY(-2px);
}

.brand-guide-link {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.brand-guide-link a {
    color: var(--secondary-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dashed var(--secondary-color);
}

.brand-guide-link a:hover {
    color: var(--primary-color);
    border-bottom-style: solid;
}

.brands-conclusion {
    margin-top: 4rem;
    padding: 2.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    color: white;
}

.brands-conclusion h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 1.5rem;
}

.brands-conclusion p {
    line-height: 1.8;
    margin-bottom: 1rem;
    opacity: 0.95;
}

.brands-conclusion a {
    color: var(--accent-light);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid var(--accent-light);
}

.brands-conclusion a:hover {
    color: white;
}

/* ========================================
   CLOSING SECTION
   ======================================== */

.closing-section {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
}

.closing-content h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.closing-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.95;
}

.closing-content a {
    color: var(--accent-light);
    text-decoration: none;
    font-weight: 600;
    border-bottom: 1px solid var(--accent-light);
}

.closing-content a:hover {
    color: white;
}

.closing-cta {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

.cta-button {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all 0.3s ease;
    background-color: var(--accent-color);
    color: white;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.cta-button.secondary {
    background-color: white;
    color: var(--primary-color);
}

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

.footer {
    background-color: var(--text-dark);
    color: white;
    padding: 3rem 0 1.5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.footer-brand p {
    opacity: 0.8;
    line-height: 1.6;
}

.footer-links h4 {
    margin-bottom: 1rem;
    color: var(--accent-light);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-disclaimer {
    grid-column: 1 / -1;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    border-radius: 6px;
    font-size: 0.9rem;
    opacity: 0.9;
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    opacity: 0.7;
    font-size: 0.9rem;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-end;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-features {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    .articles-grid {
        grid-template-columns: 1fr;
    }

    .infographics-grid {
        grid-template-columns: 1fr;
    }

    .annotation {
        position: static !important;
        margin-bottom: 1rem;
    }

    .diagram-container {
        flex-direction: column;
        min-height: auto;
    }

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        flex-direction: column !important;
        align-items: flex-start;
        padding-left: 50px;
    }

    .timeline-year {
        position: absolute;
        left: -10px;
    }

    .timeline-content {
        margin: 1rem 0 0 0;
    }

    .brands-grid {
        grid-template-columns: 1fr;
    }

    .closing-cta {
        flex-direction: column;
    }

    .cta-button {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 4rem 0;
    }

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

    .section-header h2 {
        font-size: 1.75rem;
    }

    .article-card h3 {
        font-size: 1.3rem;
    }

    .infographic-card {
        padding: 1rem;
    }

    .comparison-table {
        font-size: 0.8rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 0.5rem;
    }
}

/* ========================================
   ANIMATIONS
   ======================================== */

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

.article-card,
.infographic-card,
.brand-card,
.faq-item {
    animation: fadeInUp 0.6s ease-out;
}