/* Art2Web Human-Crafted Design System */
:root {
    /* Dark Theme Default (Studio Carbon & Warm Amber) */
    --bg-main: #0D0F12;
    --bg-surface: #14171D;
    --bg-card: #1A1D26;
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(245, 158, 11, 0.4);
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    --accent-primary: #F59E0B;
    --accent-secondary: #EA580C;
    --accent-emerald: #10B981;
    --accent-gradient: linear-gradient(135deg, #F59E0B, #EA580C);
    --accent-gradient-hover: linear-gradient(135deg, #D97706, #C2410C);
    --shadow-card: 0 12px 32px rgba(0, 0, 0, 0.35);
    --font-heading: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    --font-body: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    --radius-full: 9999px;
}

[data-theme="light"] {
    --bg-main: #F8FAFC;
    --bg-surface: #FFFFFF;
    --bg-card: #F1F5F9;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(217, 119, 6, 0.4);
    --text-primary: #0F172A;
    --text-secondary: #334155;
    --text-muted: #64748B;
    --accent-primary: #D97706;
    --accent-secondary: #C2410C;
    --shadow-card: 0 10px 25px rgba(0, 0, 0, 0.04);
}

/* Reset & Base */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header & Clean Navigation */
.header-glass {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background-color: rgba(13, 15, 18, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

[data-theme="light"] .header-glass {
    background-color: rgba(248, 250, 252, 0.92);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

.brand-logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    width: 220px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2.25rem;
    list-style: none;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s ease;
}

.nav-link:hover { color: var(--accent-primary); }

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.theme-toggle-btn {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
    transform: scale(1.05);
}

.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
}

/* Hero Section — Human Editorial & Authority */
.hero-section {
    padding-top: 150px;
    padding-bottom: 90px;
    position: relative;
    background: radial-gradient(ellipse at top, rgba(245, 158, 11, 0.06) 0%, transparent 70%);
}

.hero-content {
    text-align: center;
    max-width: 860px;
    margin: 0 auto;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.45rem 1.1rem;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    color: var(--accent-primary);
    font-weight: 600;
    margin-bottom: 1.75rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: var(--accent-primary);
    border-radius: 50%;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.4rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -1.2px;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
}

.text-gradient {
    color: var(--accent-primary);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 720px;
    margin: 0 auto 2.5rem auto;
    line-height: 1.65;
}

.hero-cta-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-bottom: 4rem;
}

.hero-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    padding: 2.25rem 2rem;
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
}

.stat-item { text-align: center; }
.stat-number {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text-primary);
    display: block;
    line-height: 1.1;
}
.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: 0.4rem;
}

/* Sections Common */
.section-padding { padding: 90px 0; }
.section-header { text-align: center; max-width: 680px; margin: 0 auto 3.5rem auto; }
.section-title { font-family: var(--font-heading); font-size: 2.3rem; font-weight: 800; letter-spacing: -0.8px; margin-bottom: 1rem; color: var(--text-primary); }
.section-subtitle { color: var(--text-secondary); font-size: 1.05rem; }

/* Applications Grid */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
    gap: 2rem;
}

.case-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    display: flex;
    flex-direction: column;
    transition: all 0.25s ease;
    box-shadow: var(--shadow-card);
}

.case-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
}

.case-badge {
    align-self: flex-start;
    padding: 0.35rem 0.85rem;
    background: rgba(245, 158, 11, 0.12);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    color: var(--accent-primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 1.25rem;
}

.case-title { font-family: var(--font-heading); font-size: 1.45rem; font-weight: 700; margin-bottom: 0.85rem; color: var(--text-primary); }
.case-summary { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 1.5rem; flex: 1; line-height: 1.6; }

.case-features { list-style: none; margin-bottom: 1.5rem; display: flex; flex-direction: column; gap: 0.65rem; }
.case-features li {
    font-size: 0.88rem;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 0.6rem;
}
.case-features li::before {
    content: "✓";
    color: var(--accent-emerald);
    font-weight: 800;
}

.case-footer {
    padding-top: 1.25rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.case-stack { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-muted); }
.case-metric { font-size: 0.85rem; font-weight: 700; color: var(--accent-emerald); }

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.75rem;
}

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    transition: all 0.25s ease;
}

.service-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-3px);
}

.service-title { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 700; margin-bottom: 1rem; color: var(--text-primary); }
.service-desc { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.6; }

/* Articles Section */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.article-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.25rem;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    transition: all 0.25s ease;
    box-shadow: var(--shadow-card);
}

.article-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-3px);
}

.article-cat { font-size: 0.75rem; font-weight: 700; color: var(--accent-primary); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 0.6rem; }
.article-title { font-family: var(--font-heading); font-size: 1.25rem; font-weight: 700; margin-bottom: 0.85rem; line-height: 1.35; color: var(--text-primary); }
.article-summary { color: var(--text-secondary); font-size: 0.9rem; flex: 1; margin-bottom: 1.25rem; }
.article-meta { font-size: 0.8rem; color: var(--text-muted); }

/* Contact Section */
.contact-container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 3rem;
    box-shadow: var(--shadow-card);
}

.contact-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.contact-form .full { grid-column: span 2; }
.contact-label { font-weight: 600; font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 0.5rem; display: block; }

.contact-input {
    width: 100%;
    padding: 0.85rem 1.1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color 0.2s ease;
}

.contact-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    padding: 0.85rem 1.75rem;
    font-size: 0.95rem;
    font-weight: 700;
    border-radius: var(--radius-md);
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.25s ease;
}

.btn-gradient {
    background: var(--accent-gradient);
    color: #FFFFFF;
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.25);
}

.btn-gradient:hover {
    background: var(--accent-gradient-hover);
    transform: translateY(-2px);
    box-shadow: 0 12px 25px rgba(245, 158, 11, 0.35);
}

.btn-outline-glass {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-outline-glass:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn-lg { padding: 1rem 2.25rem; font-size: 1.05rem; }

/* Footer */
.site-footer {
    border-top: 1px solid var(--border-color);
    padding: 60px 0 30px 0;
    background: var(--bg-surface);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-grid > div:nth-child(2),
.footer-grid > div:nth-child(3) {
    justify-self: end;
}

.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 1rem; max-width: 320px; }
.footer-title { font-family: var(--font-heading); font-weight: 700; font-size: 1rem; margin-bottom: 1.25rem; color: var(--text-primary); }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 0.75rem; }
.footer-links a { color: var(--text-secondary); text-decoration: none; font-size: 0.9rem; transition: color 0.2s; }
.footer-links a:hover { color: var(--accent-primary); }

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Responsive Media Queries */
@media (max-width: 992px) {
    .hero-title { font-size: 2.75rem; }
    .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .footer-grid > div:nth-child(2),
    .footer-grid > div:nth-child(3) { justify-self: start; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .mobile-menu-btn { display: block; }
    .hero-title { font-size: 2.2rem; }
    .hero-subtitle { font-size: 1.05rem; }
    .hero-stats-grid { grid-template-columns: 1fr 1fr; }
    .contact-container { padding: 1.75rem; }
    .contact-form { grid-template-columns: 1fr; }
    .contact-form .full { grid-column: span 1; }
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
    .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
}
/* Articles Hub, Controls & Interactive Filters */
.articles-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.75rem;
    margin-bottom: 3.5rem;
}

.search-box {
    position: relative;
    max-width: 640px;
    width: 100%;
    margin: 0 auto;
}

.search-box input {
    width: 100%;
    padding: 1rem 1.4rem 1rem 3.2rem;
    background: var(--bg-surface);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 500;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.search-box input::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.search-box input:focus {
    outline: none;
    border-color: var(--accent-primary);
    background: var(--bg-main);
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.2), 0 8px 25px rgba(0, 0, 0, 0.15);
}

.search-icon {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent-primary);
    pointer-events: none;
}

.category-filters {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.65rem;
    flex-wrap: wrap;
    padding: 0.5rem 0.75rem;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
}

.cat-filter-btn {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
    padding: 0.6rem 1.35rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    font-family: var(--font-heading);
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    outline: none;
}

.cat-filter-btn:hover {
    color: var(--accent-primary);
    background: rgba(245, 158, 11, 0.1);
    transform: translateY(-1px);
}

.cat-filter-btn.active {
    background: var(--accent-gradient);
    color: #FFFFFF !important;
    border-color: transparent;
    box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
    font-weight: 700;
}

/* Enhanced Article Cards */
.article-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.read-time-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: 0.75rem;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.05);
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
}

.article-tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-bottom: 1.25rem;
}

.kw-tag {
    font-size: 0.72rem;
    color: var(--text-muted);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 0.2rem 0.55rem;
    border-radius: var(--radius-sm);
}

.article-meta-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.article-author {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.btn-read-article {
    background: transparent;
    border: none;
    color: var(--accent-primary);
    font-weight: 700;
    font-size: 0.88rem;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    transition: gap 0.2s ease;
}

.btn-read-article:hover {
    gap: 0.5rem;
    text-decoration: underline;
}

.no-articles-msg {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-top: 2rem;
}

/* Article Modal Reader Overlay */
.article-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    animation: fadeIn 0.25s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.article-modal-container {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 860px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    position: relative;
}

.article-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2rem;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
}

.modal-badge-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.modal-close-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.modal-close-btn:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.article-modal-body {
    padding: 2.5rem 2.5rem 3rem 2.5rem;
    overflow-y: auto;
    line-height: 1.75;
}

.modal-article-title {
    font-family: var(--font-heading);
    font-size: 2.1rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.5px;
    color: var(--text-primary);
    margin-bottom: 1.25rem;
}

.modal-author-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-bottom: 1.75rem;
    margin-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.author-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.95rem;
}

.modal-author-meta div {
    display: flex;
    flex-direction: column;
}

.modal-author-meta strong {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.modal-author-meta span {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* Formatted Content inside Modal */
.modal-article-content {
    color: var(--text-secondary);
    font-size: 1.05rem;
}

.modal-article-content p {
    margin-bottom: 1.5rem;
}

.modal-article-content h2 {
    font-family: var(--font-heading);
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 2.25rem 0 1rem 0;
}

.modal-article-content h3 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 1.75rem 0 0.85rem 0;
}

.modal-article-content ul,
.modal-article-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

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

/* Conversion Box inside Article */
.article-cta-box {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), rgba(234, 88, 12, 0.04));
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin: 2.5rem 0;
    text-align: center;
}

.article-cta-box h3 {
    font-size: 1.35rem;
    color: var(--accent-primary);
    margin-top: 0 !important;
    margin-bottom: 0.6rem !important;
}

.article-cta-box p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem !important;
}

/* Modal Bottom Sticky CTA Bar */
.modal-bottom-cta {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.cta-inner {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.cta-inner h4 {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.3rem;
}

.cta-inner p {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-bottom: 0 !important;
}

@media (max-width: 768px) {
    .article-modal-overlay { padding: 0; }
    .article-modal-container { max-height: 100vh; height: 100vh; border-radius: 0; }
    .article-modal-body { padding: 1.5rem; }
    .modal-article-title { font-size: 1.6rem; }
    .cta-inner { flex-direction: column; text-align: center; }
}