/* =========================================
   HFK Corporation - Global Styles
   ========================================= */

:root {
    /* Colors */
    --bg-main: #050505;
    --bg-darker: #000000;
    --bg-card: rgba(20, 20, 20, 0.6);
    --border-card: rgba(255, 255, 255, 0.08);
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    
    /* Emerald Series Theme */
    --emerald-primary: #10b981;
    --emerald-secondary: #059669;
    --emerald-glow: rgba(16, 185, 129, 0.15);
    
    /* Typography */
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    
    /* Transitions & Radii */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}

.bg-darker {
    background-color: var(--bg-darker);
}

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

/* =========================================
   Typography & Gradients
   ========================================= */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, #f8fafc, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.gradient-text-emerald {
    background: linear-gradient(135deg, #34d399, #059669);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* =========================================
   Glassmorphism Utilities
   ========================================= */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.glass-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transform: translateY(-5px);
}

/* =========================================
   Buttons
   ========================================= */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--emerald-primary), var(--emerald-secondary));
    color: #fff;
    box-shadow: 0 4px 15px var(--emerald-glow);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.3);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-card);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.05rem;
}

/* =========================================
   Navbar
   ========================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition);
    padding: 20px 0;
}

.navbar.scrolled {
    background: rgba(5, 5, 5, 0.85);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom: 1px solid var(--border-card);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--emerald-primary), var(--emerald-secondary));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000;
    font-size: 1rem;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* =========================================
   Hero Section
   ========================================= */
.hero {
    position: relative;
    padding: 180px 0 100px;
    min-height: 80vh;
    display: flex;
    align-items: center;
    text-align: center;
    overflow: hidden;
}

.hero-bg-glow {
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--emerald-glow) 0%, transparent 60%);
    z-index: -1;
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-card);
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 24px;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--emerald-primary);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--emerald-primary);
}

.hero h1 {
    font-size: 4.5rem;
    letter-spacing: -1.5px;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* =========================================
   About Section
   ========================================= */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 40px 32px;
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
    border: 1px solid var(--border-card);
}

.feature-card h3 {
    margin-bottom: 12px;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* =========================================
   Emerald Series Section
   ========================================= */
.series-tag {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--emerald-primary);
    font-weight: 600;
    margin-bottom: 12px;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 32px;
}

.portfolio-card {
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--border-card);
}

.bg-gradient-1 { background: linear-gradient(135deg, #1e3a8a, #3b82f6); }
.bg-gradient-2 { background: linear-gradient(135deg, #064e3b, #10b981); }
.bg-gradient-3 { background: linear-gradient(135deg, #4c1d95, #8b5cf6); }
.bg-gradient-4 { background: linear-gradient(135deg, #78350f, #f59e0b); }
.bg-gradient-5 { background: linear-gradient(135deg, #831843, #f43f5e); }

.app-mockup {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.2);
    letter-spacing: -2px;
}

.card-content {
    padding: 32px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-content h3 {
    margin-bottom: 12px;
    font-size: 1.4rem;
}

.card-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
    flex-grow: 1;
}

.card-link {
    color: var(--emerald-primary);
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
}

.card-link:hover {
    color: var(--emerald-secondary);
    transform: translateX(4px);
}

/* =========================================
   Blog Section
   ========================================= */
.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.blog-card {
    padding: 32px;
}

.blog-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.blog-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.blog-card h3 a:hover {
    color: var(--emerald-primary);
}

.blog-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 20px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.read-more {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-card);
    padding-bottom: 2px;
}

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

/* =========================================
   FAQ Section
   ========================================= */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 400;
    transition: var(--transition);
}

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

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.faq-answer p {
    padding: 0 24px 24px;
    color: var(--text-secondary);
}

/* =========================================
   Footer
   ========================================= */
.footer {
    border-top: 1px solid var(--border-card);
    padding: 80px 0 40px;
    background: var(--bg-darker);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 60px;
}

.footer-desc {
    color: var(--text-secondary);
    margin-top: 16px;
    font-size: 0.95rem;
    max-width: 300px;
}

.footer-links h4 {
    font-size: 1.1rem;
    margin-bottom: 20px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    border-top: 1px solid var(--border-card);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-links a {
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-card);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.social-links a:hover {
    background: var(--emerald-primary);
    border-color: var(--emerald-primary);
    color: #fff;
}

/* =========================================
   Animations & Responsive
   ========================================= */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

@media (max-width: 992px) {
    .hero h1 { font-size: 3.5rem; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links, .nav-cta { display: none; }
    .mobile-menu-btn { display: flex; }
    .hero h1 { font-size: 2.5rem; }
    .hero-actions { flex-direction: column; }
    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 20px; text-align: center; }
}