/* Custom Font Definitions */
@font-face {
    font-family: 'OpenAI Sans';
    src: url('./assets/fonts/OpenAISans-Regular.woff2') format('woff2');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'OpenAI Sans';
    src: url('./assets/fonts/OpenAISans-Medium.woff2') format('woff2');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'OpenAI Sans';
    src: url('./assets/fonts/OpenAISans-Semibold.woff2') format('woff2');
    font-weight: 600;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'OpenAI Sans';
    src: url('./assets/fonts/OpenAISans-Bold.woff2') format('woff2');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

/* CSS Variables */
:root {
    /* Colors */
    --color-primary: #000000;
    --color-secondary: #1a1a1a;
    --color-tertiary: #333333;
    --color-accent: #0066cc;
    --color-accent-hover: #0052a3;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-bg-tertiary: #f1f3f4;
    
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-text-inverse: #ffffff;
    
    --color-border: #e5e7eb;
    --color-border-hover: #d1d5db;
    
    /* Typography */
    --font-family-primary: 'OpenAI Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --header-height: 80px;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    
    /* Animations */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-base: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
}

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

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

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -60px;
    left: 6px;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    padding: var(--space-2) var(--space-4);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 500;
    z-index: 1000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

/* Container */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--space-4);
    }
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
    transition: background-color var(--transition-base);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--color-text-primary);
    font-weight: 600;
    font-size: var(--font-size-xl);
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.8;
}

.logo-symbol {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--border-radius);
}

/* Navigation */
.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-8);
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

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

.nav-link:not(.cta-button)::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width var(--transition-base);
}

.nav-link:not(.cta-button):hover::after {
    width: 100%;
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: var(--space-1);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
}

/* Buttons */
.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-base);
    border-radius: var(--border-radius-lg);
    transition: all var(--transition-base);
    border: 2px solid transparent;
    cursor: pointer;
    min-height: 44px;
}

.cta-button.primary {
    background: var(--color-accent);
    color: var(--color-text-inverse);
}

.cta-button.primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.cta-button.secondary {
    background: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.cta-button.secondary:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-border-hover);
    transform: translateY(-1px);
}

/* Main Content */
main {
    margin-top: var(--header-height);
}

/* Section Styling */
section {
    padding: var(--space-20) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.2;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

@media (max-width: 768px) {
    section {
        padding: var(--space-16) 0;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
    
    .section-subtitle {
        font-size: var(--font-size-base);
    }
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    padding: var(--space-24) 0 var(--space-20);
    overflow: hidden;
    position: relative;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: center;
    min-height: 600px;
}

.hero-title {
    font-size: var(--font-size-6xl);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
    line-height: 1.1;
}

.hero-description {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    line-height: 1.6;
}

.hero-actions {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 500px;
}

.hero-graphic {
    position: relative;
    width: 100%;
    height: 100%;
}

.floating-element {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(45deg, var(--color-accent), var(--color-accent-hover));
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.floating-element.element-1 {
    width: 120px;
    height: 120px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.floating-element.element-2 {
    width: 80px;
    height: 80px;
    top: 60%;
    right: 20%;
    animation-delay: 2s;
}

.floating-element.element-3 {
    width: 100px;
    height: 100px;
    bottom: 20%;
    left: 50%;
    animation-delay: 4s;
}

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

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
        text-align: center;
    }
    
    .hero-title {
        font-size: var(--font-size-5xl);
    }
    
    .hero-visual {
        height: 300px;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: var(--space-16) 0;
    }
    
    .hero-title {
        font-size: var(--font-size-4xl);
    }
    
    .hero-description {
        font-size: var(--font-size-lg);
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .cta-button {
        width: 100%;
        max-width: 300px;
    }
}

/* About Section */
.about {
    background: var(--color-bg-secondary);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.7;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
    margin-top: var(--space-12);
    padding-top: var(--space-12);
    border-top: 1px solid var(--color-border);
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-accent);
    line-height: 1;
    margin-bottom: var(--space-2);
}

.stat-label {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    font-weight: 500;
}

@media (max-width: 768px) {
    .stats-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.service-card {
    background: var(--color-bg-primary);
    padding: var(--space-8);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    height: 100%;
}

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

.service-icon {
    width: 64px;
    height: 64px;
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-6);
    color: var(--color-accent);
    transition: all var(--transition-base);
}

.service-card:hover .service-icon {
    background: var(--color-accent);
    color: var(--color-text-inverse);
}

.service-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    line-height: 1.3;
}

.service-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
    
    .service-card {
        padding: var(--space-6);
    }
}

/* Portfolio Section */
.portfolio {
    background: var(--color-bg-secondary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-16);
}

.portfolio-card {
    background: var(--color-bg-primary);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.portfolio-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.portfolio-image {
    aspect-ratio: 16/9;
    background: var(--color-bg-primary);
    position: relative;
    overflow: hidden;
}

.placeholder-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, var(--color-bg-tertiary) 0%, var(--color-bg-secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

/* Make the external SVG behave like a responsive image and fit the box */
.portfolio-image img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;     /* preserve aspect ratio and avoid cropping */
    object-position: center;
    max-width: 100%;
}

.placeholder-image::before {
    content: '';
    width: 60px;
    height: 60px;
    background: var(--color-border);
    border-radius: var(--border-radius);
    opacity: 0.5;
}

.portfolio-content {
    padding: var(--space-6);
}

.portfolio-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-3);
    line-height: 1.3;
}

.portfolio-description {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.portfolio-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.tag {
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--border-radius);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* Testimonials */
.testimonials {
    margin-top: var(--space-16);
    padding-top: var(--space-16);
    border-top: 1px solid var(--color-border);
}

.testimonials-title {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
    text-align: center;
    margin-bottom: var(--space-12);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-8);
}

.testimonial {
    background: var(--color-bg-primary);
    padding: var(--space-8);
    border-radius: var(--border-radius-xl);
    border: 1px solid var(--color-border);
    font-style: normal;
}

.testimonial p {
    font-size: var(--font-size-lg);
    color: var(--color-text-primary);
    line-height: 1.6;
    margin-bottom: var(--space-4);
    font-style: italic;
}

.testimonial cite {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-style: normal;
}

/* Make links inside testimonials look natural and readable */
.testimonial a {
    color: var(--color-accent);
    text-decoration: none; /* remove browser default underline */
    border-bottom: 1px solid rgba(0, 102, 204, 0.12); /* subtle underline effect */
    padding-bottom: 1px;
    transition: color var(--transition-fast), border-color var(--transition-fast), opacity var(--transition-fast);
}

.testimonial a:hover,
.testimonial a:focus {
    color: var(--color-accent-hover);
    border-bottom-color: var(--color-accent-hover);
    opacity: 0.95;
    outline: none;
}

/* Keep cite links muted and non-distracting */
.testimonial cite a {
    color: var(--color-text-secondary);
    text-decoration: none;
    border-bottom: none;
}

/* Accessible focus ring for keyboard users */
.testimonial a:focus-visible {
    box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.12);
    border-bottom-color: var(--color-accent-hover);
}

@media (max-width: 768px) {
    .portfolio-grid,
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        gap: var(--space-6);
    }
    
    .testimonial {
        padding: var(--space-6);
    }
}

/* Contact Section */
.contact {
    background: var(--color-primary);
    color: var(--color-text-inverse);
}

.contact .section-title,
.contact .section-subtitle {
    color: var(--color-text-inverse);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-12);
    align-items: start;
}

.contact-details {
    margin-top: var(--space-8);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
    color: rgba(255, 255, 255, 0.9);
}

.contact-icon {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
}

/* Contact Form */
.contact-form-container {
    background: var(--color-bg-primary);
    padding: var(--space-8);
    border-radius: var(--border-radius-xl);
    color: var(--color-text-primary);
}

.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
    font-size: var(--font-size-sm);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--space-4);
    border: 2px solid var(--color-border);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: var(--font-size-base);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    transition: border-color var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

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

.form-error {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--space-2);
    display: none;
}

.form-error.show {
    display: block;
}

.form-submit {
    width: 100%;
    border: none;
    font-family: inherit;
    margin-top: var(--space-4);
}

@media (max-width: 1024px) {
    .contact-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
}

@media (max-width: 768px) {
    .contact-form-container {
        padding: var(--space-6);
    }
}

/* Footer */
.footer {
    background: var(--color-bg-tertiary);
    padding: var(--space-16) 0 var(--space-8);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-description {
    color: var(--color-text-secondary);
    margin-top: var(--space-4);
    font-size: var(--font-size-base);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
}

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

.footer-list {
    list-style: none;
}

.footer-list li {
    margin-bottom: var(--space-2);
}

.footer-list a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }
}

/* Accessibility Enhancements */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* Focus Styles */
*:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    * {
        background: transparent !important;
        color: black !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    .header,
    .footer,
    .hero-visual,
    .floating-element {
        display: none;
    }
    
    main {
        margin-top: 0;
    }
    
    .cta-button {
        border: 1px solid black;
    }
    
    .section-title {
        page-break-after: avoid;
    }
    
    .service-card,
    .portfolio-card,
    .testimonial {
        break-inside: avoid;
    }
}