/* 
   Burhani Global - Premium Custom CSS
   Clean, modern, high-performance styling using CSS Custom Properties
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* --- Theme Variables --- */
:root {
    --color-bg-primary: #FFFFFF;       /* Crisp White Canvas */
    --color-bg-secondary: #F8F9FA;     /* Premium Soft Off-White */
    --color-bg-tertiary: #F1F3F5;      /* Sublte Gray Borders & Dividers */
    --color-text-primary: #111827;     /* High-Contrast Charcoal Black */
    --color-text-secondary: #4B5563;   /* Slate Gray for descriptions */
    --color-text-muted: #9CA3AF;       /* Soft Gray for secondary notes */
    
    --color-accent: #D32F2F;           /* Premium Corporate Crimson Red */
    --color-accent-dark: #9E1B1B;      /* Deep Maroon Red */
    --color-accent-light: #FFEBEE;     /* Rose Blush Highlight Background */
    --color-accent-gradient: linear-gradient(135deg, #E53935 0%, #B71C1C 100%);
    --color-gold-gradient: linear-gradient(135deg, #E53935 0%, #D32F2F 100%);
    --color-glass-bg: rgba(255, 255, 255, 0.85); /* Light glass */
    --color-glass-border: rgba(0, 0, 0, 0.06);

    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;

    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -4px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 25px rgba(211, 47, 47, 0.2);
}

/* --- Base Resets --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: var(--color-text-primary);
}

p {
    color: var(--color-text-secondary);
    margin-bottom: 1.5rem;
}

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

/* --- Navigation / Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    border-bottom: 1px solid transparent;
    transition: var(--transition-normal);
    padding: 1.25rem 0;
}

.header.scrolled {
    background: var(--color-glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-glass-border);
    padding: 0.85rem 0;
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-text-primary) 30%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-icon {
    width: 32px;
    height: 32px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    list-style: none;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
    padding: 0.25rem 0;
}

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

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

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

.nav-link.active {
    color: var(--color-text-primary);
}

.btn-cta-nav {
    padding: 0.6rem 1.25rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    background: var(--color-accent-gradient);
    box-shadow: var(--shadow-sm);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-cta-nav:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* --- Hamburger Menu --- */
.hamburger {
    display: none;
    cursor: pointer;
    background: none;
    border: none;
    z-index: 1010;
}

.hamburger span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-text-primary);
    margin: 5px 0;
    transition: var(--transition-normal);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    background: radial-gradient(circle at 10% 20%, rgba(211, 47, 47, 0.05) 0%, transparent 50%),
                radial-gradient(circle at 90% 80%, rgba(211, 47, 47, 0.02) 0%, transparent 50%),
                var(--color-bg-secondary);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: var(--color-accent);
    filter: blur(180px);
    opacity: 0.1;
    top: -10%;
    right: -10%;
    pointer-events: none;
}

.container-hero {
    max-width: 1280px;
    margin: 0 auto;
    padding: 4rem 2rem;
    display: grid;
    grid-template-columns: 1.1s 0.9s;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 650px;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--color-accent-light);
    border: 1px solid rgba(211, 47, 47, 0.15);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, var(--color-text-primary) 30%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--color-accent-gradient);
    color: #FFFFFF;
    font-family: var(--font-heading);
    font-weight: 600;
    padding: 1rem 2.25rem;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-fast);
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: transparent;
    border: 1px solid var(--color-glass-border);
    color: var(--color-text-primary);
    font-family: var(--font-heading);
    font-weight: 600;
    padding: 1rem 2.25rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
    cursor: pointer;
}

.btn-secondary:hover {
    background: rgba(0, 0, 0, 0.02);
    border-color: var(--color-accent);
}

.hero-visual {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.glow-card {
    background: var(--color-glass-bg);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--border-radius-md);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    position: relative;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    width: 100%;
    max-width: 480px;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
}

/* --- Section Global --- */
.section {
    padding: 7rem 2rem;
    position: relative;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 5rem auto;
}

.section-tag {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
    display: block;
}

.section-title {
    font-size: clamp(2rem, 3.5vw, 2.75rem);
    font-weight: 800;
    margin-bottom: 1.25rem;
}

/* --- Features / Value Props --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background: var(--color-bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.03);
    padding: 3rem 2.5rem;
    border-radius: var(--border-radius-md);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--color-accent);
    opacity: 0;
    transition: var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-6px);
    border-color: var(--color-glass-border);
    box-shadow: var(--shadow-md);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon-wrapper {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background: var(--color-accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.75rem;
    color: var(--color-accent);
}

.feature-title {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* --- Services Catalog Section --- */
.services-tabs-container {
    margin-top: 3rem;
}

.services-tabs {
    display: flex;
    justify-content: center;
    gap: 1rem;
    list-style: none;
    margin-bottom: 4rem;
    flex-wrap: wrap;
    border-bottom: 1px solid var(--color-glass-border);
    padding-bottom: 1rem;
}

.tab-btn {
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-normal);
}

.tab-btn.active, .tab-btn:hover {
    color: var(--color-text-primary);
    background: var(--color-accent-light);
}

.services-grid-pane {
    display: none;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    animation: fadeIn 0.5s ease;
}

.services-grid-pane.active {
    display: grid;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.service-item-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--border-radius-md);
    padding: 2.5rem;
    transition: var(--transition-normal);
}

.service-item-card:hover {
    transform: translateY(-4px);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-sm);
}

.service-card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--color-text-primary);
}

.service-card-list {
    list-style: none;
    margin-top: 1.25rem;
}

.service-card-list li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 0.5rem;
}

.service-card-list li::before {
    content: "✓";
    color: var(--color-accent);
    font-weight: bold;
}

/* --- Split / Focus Sections --- */
.split-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
}

.split-visual {
    position: relative;
}

.split-image-container {
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-glass-border);
    box-shadow: var(--shadow-lg);
    background: var(--color-bg-secondary);
}

.split-image-container svg {
    display: block;
    width: 100%;
    height: auto;
}

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

.stat-box {
    background: rgba(255, 255, 255, 0.02);
    border-left: 3px solid var(--color-accent);
    padding: 1rem 1.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--color-text-primary);
    font-family: var(--font-heading);
}

.stat-label {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
}

/* --- Contact Form Section --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 5rem;
}

.contact-info-block {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
}

.info-item {
    display: flex;
    gap: 1.5rem;
}

.info-icon-wrapper {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-sm);
    background: var(--color-accent-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    flex-shrink: 0;
}

.info-details h4 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
}

.info-details p, .info-details a {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.contact-form-wrapper {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--border-radius-md);
    padding: 3rem;
}

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

.form-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
}

.form-control {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-glass-border);
    border-radius: var(--border-radius-sm);
    padding: 0.85rem 1rem;
    color: var(--color-text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-bg-primary);
    box-shadow: 0 0 10px rgba(211, 47, 47, 0.15);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

.form-feedback {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    display: none;
}

.form-feedback.success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: #10B981;
    display: block;
}

.form-feedback.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #EF4444;
    display: block;
}

/* --- Footer --- */
.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-bg-tertiary);
    padding: 5rem 2rem 2.5rem 2rem;
}

.footer-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand p {
    margin-top: 1rem;
    max-width: 280px;
    color: var(--color-text-secondary);
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-primary);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

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

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

.footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    border-top: 1px solid var(--color-bg-tertiary);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 0;
}

.footer-socials {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.03);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.social-link:hover {
    background: var(--color-accent);
    color: var(--color-bg-primary);
}

/* --- Reveal on Scroll Animation Utilities --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

/* --- Responsive Adjustments --- */
@media (max-width: 1024px) {
    .container-hero {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
    }
    
    .hero-content {
        margin: 0 auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .split-section {
        grid-template-columns: 1fr;
        gap: 4rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 4rem;
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 350px;
        height: 100vh;
        background: var(--color-bg-secondary);
        border-left: 1px solid var(--color-glass-border);
        flex-direction: column;
        justify-content: center;
        gap: 2rem;
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .form-group-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
}