:root {
    --primary-color: #004A99;
    --primary-light: #1A66BA;
    --primary-dark: #003366;
    --secondary-color: #FF6B00;
    --secondary-light: #FF8533;
    --secondary-dark: #CC5500;
    
    --text-dark: #333333;
    --text-light: #FFFFFF;
    --text-gray: #6B7280;
    --bg-light: #F9FAFB;
    --bg-dark: #111827;
    --bg-white: #FFFFFF;
    
    --font-sans: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    
    --radius-sm: 0.375rem;
    --radius-md: 0.75rem;
    --radius-lg: 1.5rem;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(0, 74, 153, 0.3);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.2;
    margin-bottom: 1rem;
}

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

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section-padding {
    padding: 6rem 0;
}

.text-center { text-align: center; }
.text-white { color: var(--text-light); }
.text-gray { color: var(--text-gray); }
.bg-light { background-color: var(--bg-light); }
.bg-dark { background-color: var(--bg-dark); }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Typography Classes */
.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 3rem;
    max-width: 800px;
    margin-inline: auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-family: var(--font-sans);
    cursor: pointer;
    border: none;
    text-align: center;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-light);
    box-shadow: 0 4px 14px 0 rgba(0, 74, 153, 0.39);
}

.btn-primary:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 74, 153, 0.4);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--text-light);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
    padding: 0.5rem 0;
}

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

.logo img {
    height: 40px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    font-weight: 500;
    color: var(--text-dark);
}

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

/* Hero Section */
.hero {
    position: relative;
    padding-top: 140px;
    padding-bottom: 80px;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-text h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.hero-text p {
    font-size: 1.25rem;
    color: var(--text-gray);
    margin-bottom: 2.5rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
}

.floating-img {
    animation: float 6s ease-in-out infinite;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
    100% { transform: translateY(0px); }
}

.hero-bg-glow {
    position: absolute;
    top: -10%;
    right: -5%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0,74,153,0.15) 0%, rgba(255,255,255,0) 70%);
    z-index: 1;
}

/* About SPI */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.service-card {
    padding: 2rem;
    border-radius: var(--radius-md);
    background: var(--bg-white);
    border: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: rgba(0, 74, 153, 0.2);
}

.service-card .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* Feature Showcase / Layouts */
.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.split-layout.reverse {
    direction: rtl;
}
.split-layout.reverse > * {
    direction: ltr;
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background-color: rgba(255, 107, 0, 0.1);
    color: var(--secondary-color);
    font-weight: 600;
    border-radius: 20px;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.feature-list li {
    margin-bottom: 1rem;
    font-size: 1.1rem;
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.glass-panel {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.5);
    box-shadow: var(--shadow-lg);
    padding: 2rem;
}

/* Scan Animation */
.scan-animation {
    position: relative;
    height: 300px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.invoice-mock {
    width: 200px;
    height: 250px;
    background: white;
    box-shadow: var(--shadow-md);
    padding: 20px;
    position: relative;
}

.invoice-mock .line {
    height: 10px;
    background: #e5e7eb;
    margin-bottom: 15px;
    border-radius: 5px;
}

.invoice-mock .line.short {
    width: 60%;
}

.scanner-bar {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--secondary-color);
    box-shadow: 0 0 10px var(--secondary-color), 0 0 20px var(--secondary-color);
    animation: scan 2s linear infinite alternate;
}

@keyframes scan {
    0% { top: 10%; }
    100% { top: 90%; }
}

/* Workflow Steps */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.step-card {
    position: relative;
    padding: 2rem;
}

.step-number {
    font-size: 4rem;
    font-weight: 800;
    color: rgba(0, 74, 153, 0.1);
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: -1;
}

.step-card h3 {
    margin-top: 1rem;
}

/* Code Block */
.code-block {
    background: #1e1e1e;
    color: #d4d4d4;
    padding: 1.5rem;
    border-radius: var(--radius-md);
    font-family: monospace;
    overflow-x: auto;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
}

.code-block pre {
    margin: 0;
}

/* Benefits Grid */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.benefit-card {
    background: var(--bg-white);
    padding: 2rem;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-top: 4px solid var(--secondary-color);
}

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

/* Contact Form */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid #d1d5db;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 74, 153, 0.1);
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.checkbox-group input {
    width: auto;
}

/* Footer */
.footer {
    background: var(--bg-dark);
    color: var(--text-light);
    padding: 4rem 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    height: 40px;
    margin-bottom: 1rem;
    filter: brightness(0) invert(1);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

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

.footer-bottom {
    text-align: center;
    padding: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: var(--text-gray);
    font-size: 0.875rem;
}

/* Lightbox */
.lightbox-trigger {
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.lightbox-trigger:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 30px rgba(0, 74, 153, 0.4);
}

.lightbox {
    display: none;
    position: fixed;
    z-index: 9999;
    padding-top: 50px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(8px);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.lightbox.show {
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 1;
}

.lightbox-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 90vh;
    border-radius: var(--radius-md);
    box-shadow: 0 0 40px rgba(0,0,0,0.5);
    transform: scale(0.8);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.lightbox.show .lightbox-content {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
    z-index: 10000;
}

.lightbox-close:hover,
.lightbox-close:focus {
    color: var(--secondary-color);
    text-decoration: none;
    cursor: pointer;
    transform: scale(1.1);
}

/* Responsive */
@media (max-width: 992px) {
    .hero-content, .split-layout, .contact-container {
        grid-template-columns: 1fr;
    }
    .hero-text h1 {
        font-size: 2.5rem;
    }
    .nav-links {
        display: none; /* simple mobile menu hidden for now */
    }
}