/* ========================================
   QSN Heinrich - Professional Landing Page
   ======================================== */

/* CSS Variables */
:root {
    --primary: #1e3a5f;
    --primary-light: #2a4a73;
    --primary-dark: #152a45;
    --accent: #e67e22;
    --accent-light: #f39c12;
    --accent-dark: #d35400;
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --success: #22c55e;
    --error: #ef4444;
    
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-md: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    --transition: 150ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--gray-700);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* Container */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h3 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
}

h4 {
    font-size: 1.125rem;
}

p {
    color: var(--gray-600);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition-slow);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 800;
}

.logo-qsn {
    background: var(--primary);
    color: var(--white);
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    font-size: 1.125rem;
    letter-spacing: -0.025em;
}

.logo-name {
    color: var(--gray-900);
    font-size: 1.125rem;
    letter-spacing: 0.05em;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    padding: 0.625rem 1rem;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: var(--radius);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary);
    background: var(--gray-100);
}

.nav-cta {
    background: var(--primary);
    color: var(--white) !important;
    margin-left: 0.5rem;
}

.nav-cta:hover {
    background: var(--primary-light) !important;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--gray-800);
    transition: var(--transition);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: var(--transition);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.0625rem;
}

.btn-full {
    width: 100%;
}

.btn-primary {
    background: var(--accent);
    color: var(--white);
    box-shadow: 0 4px 14px 0 rgba(230, 126, 34, 0.39);
}

.btn-primary:hover {
    background: var(--accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(230, 126, 34, 0.23);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-white {
    background: var(--white);
    color: var(--primary);
}

.btn-white:hover {
    background: var(--gray-100);
    transform: translateY(-2px);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 0 6rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    inset: 0;
    opacity: 0.1;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image: 
        radial-gradient(circle at 20% 80%, var(--accent) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, var(--accent-light) 0%, transparent 40%);
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-full);
    color: var(--white);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.hero h1 {
    color: var(--white);
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.text-accent {
    color: var(--accent-light);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2.5rem;
    max-width: 600px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 4rem;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.2);
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

/* Sections General */
.section {
    padding: 6rem 0;
}

.section-light {
    background: var(--white);
}

.section-dark {
    background: var(--primary);
}

.section-header {
    max-width: 700px;
    margin: 0 auto 4rem;
    text-align: center;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
}

.section-badge.light {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.section-header h2 {
    margin-bottom: 1rem;
}

.section-header p {
    font-size: 1.125rem;
}

.section-dark h2,
.section-dark p {
    color: var(--white);
}

.section-dark p {
    opacity: 0.85;
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.service-card {
    position: relative;
    padding: 2.5rem;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    transition: var(--transition-slow);
}

.service-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--gray-300);
}

.service-card.featured {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}

.service-badge {
    position: absolute;
    top: -1px;
    right: -1px;
    padding: 0.5rem 1rem;
    background: var(--accent);
    color: var(--white);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 0 var(--radius-lg) 0 var(--radius);
}

.service-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
}

.service-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.5rem;
}

.service-card p {
    margin-bottom: 1.5rem;
    color: var(--gray-600);
}

.service-list {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.service-list li {
    position: relative;
    padding-left: 1.5rem;
    font-size: 0.9375rem;
    color: var(--gray-600);
}

.service-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
}

/* USP Section */
.usp-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.usp-content h2 {
    color: var(--white);
    margin-bottom: 1rem;
}

.usp-content > p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 2.5rem;
    font-size: 1.125rem;
}

.usp-features {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.usp-feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.usp-feature-icon {
    width: 48px;
    height: 48px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius);
    color: var(--accent-light);
}

.usp-feature-content h4 {
    color: var(--white);
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

.usp-feature-content p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
}

.usp-visual {
    display: flex;
    justify-content: center;
}

.usp-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    max-width: 360px;
}

.usp-card-header {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.usp-check-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--success);
    border-radius: var(--radius-full);
    color: var(--white);
}

.usp-card-header h3 {
    color: var(--white);
    margin-bottom: 0.5rem;
}

.usp-card-header p {
    color: rgba(255, 255, 255, 0.7);
}

.usp-card-body {
    display: flex;
    justify-content: space-around;
    text-align: center;
}

.usp-metric-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1;
}

.usp-metric-label {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

/* About Section */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-image-frame {
    position: relative;
}

.about-image-frame::before {
    content: '';
    position: absolute;
    top: -1rem;
    left: -1rem;
    right: 1rem;
    bottom: 1rem;
    border: 2px solid var(--accent);
    border-radius: var(--radius-lg);
}

.about-image-placeholder {
    position: relative;
    aspect-ratio: 4/5;
    background: var(--primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-image-pattern {
    position: absolute;
    inset: 0;
    opacity: 0.1;
    background-image: radial-gradient(circle at 2px 2px, white 1px, transparent 0);
    background-size: 24px 24px;
}

.about-image-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.about-image-title {
    display: block;
    font-size: 5rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1;
    letter-spacing: -0.05em;
}

.about-image-subtitle {
    font-size: 1.5rem;
    color: var(--accent-light);
    letter-spacing: 0.1em;
    font-weight: 600;
}

.about-content h2 {
    margin-bottom: 1rem;
}

.about-content > p {
    margin-bottom: 1rem;
    color: var(--gray-600);
}

.about-highlights {
    display: flex;
    gap: 2rem;
    margin-top: 2.5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-200);
}

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

.about-highlight-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.about-highlight-text {
    font-size: 0.75rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* CTA Section */
.cta-section {
    position: relative;
    padding: 6rem 0;
    background: var(--primary);
    overflow: hidden;
}

.cta-background {
    position: absolute;
    inset: 0;
    opacity: 0.15;
}

.cta-pattern {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 0% 0%, var(--accent) 0%, transparent 50%),
        radial-gradient(circle at 100% 100%, var(--accent-light) 0%, transparent 50%);
}

.cta-content {
    position: relative;
    z-index: 1;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.cta-content h2 {
    color: var(--white);
    margin-bottom: 1rem;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Contact Section */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 3rem;
}

.contact-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    align-content: start;
}

.contact-card {
    padding: 1.5rem;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.contact-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow);
}

.contact-card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.contact-card h4 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-500);
    margin-bottom: 0.5rem;
}

.contact-card a,
.contact-card span {
    color: var(--gray-900);
    font-weight: 600;
    font-size: 0.9375rem;
}

.contact-card a:hover {
    color: var(--accent);
}

.contact-form-wrapper {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
}

.contact-form h3 {
    margin-bottom: 1.5rem;
}

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

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-700);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius);
    background: var(--white);
    color: var(--gray-900);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(230, 126, 34, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

.form-checkbox {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.form-checkbox input {
    width: auto;
    margin-top: 0.25rem;
}

.form-checkbox label {
    margin: 0;
    font-size: 0.8125rem;
    color: var(--gray-600);
    font-weight: 400;
}

/* Footer */
.footer {
    background: var(--gray-900);
    color: var(--gray-400);
    padding: 4rem 0 2rem;
}

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

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.footer-logo .logo-qsn {
    font-size: 0.875rem;
    padding: 0.375rem 0.625rem;
}

.footer-logo .logo-name {
    color: var(--white);
    font-size: 0.875rem;
}

.footer-brand p {
    color: var(--gray-500);
    font-size: 0.9375rem;
}

.footer-nav h4,
.footer-contact h4 {
    color: var(--white);
    margin-bottom: 1rem;
    font-size: 0.9375rem;
}

.footer-nav ul,
.footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-nav a,
.footer-contact a {
    color: var(--gray-500);
    font-size: 0.9375rem;
    transition: var(--transition);
}

.footer-nav a:hover,
.footer-contact a:hover {
    color: var(--white);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
}

.footer-bottom p {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
}

.footer-links a {
    color: var(--gray-500);
    font-size: 0.875rem;
    transition: var(--transition);
}

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

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--white);
    padding: 3rem;
    border-radius: var(--radius-lg);
    max-width: 450px;
    text-align: center;
    box-shadow: var(--shadow-xl);
    animation: modalSlide 0.3s ease;
}

@keyframes modalSlide {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(34, 197, 94, 0.1);
    border-radius: var(--radius-full);
    color: var(--success);
}

.modal-content h3 {
    margin-bottom: 0.75rem;
}

.modal-content p {
    margin-bottom: 1.5rem;
    color: var(--gray-600);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .usp-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .usp-visual {
        order: -1;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .about-image {
        max-width: 400px;
        margin: 0 auto;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--white);
        padding: 1rem;
        border-bottom: 1px solid var(--gray-200);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-slow);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-link {
        width: 100%;
        text-align: center;
    }
    
    .nav-cta {
        margin: 0.5rem 0 0;
    }
    
    .hero {
        padding: 7rem 0 5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .stat-divider {
        display: none;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .about-highlights {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .contact-info {
        grid-template-columns: 1fr 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
    
    .cta-buttons {
        flex-direction: column;
    }
    
    .section {
        padding: 4rem 0;
    }
}