/* CSS Variables */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-gray-dark: #1e293b;
    --color-gray-medium: #4b5563;
    --color-gray-light: #64748b;
    --color-gray-lighter: #94a3b8;
    --color-gray-bg: #f8fafc;
    --color-white: #fff;
    --color-success: #10b981;
    --shadow-sm: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 6px 24px rgba(0,0,0,0.12);
    --border-radius: 10px;
    --border-radius-sm: 6px;
    --transition: all 0.3s ease;
    --footer-bg: var(--color-gray-dark);
    --footer-color: var(--color-white);
    --footer-border: none;
    --logo-green: #3f965b;
}

/* Dark Mode Variables */
body.dark {
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-gray-dark: #f3f4f6;
    --color-gray-medium: #d1d5db;
    --color-gray-light: #9ca3af;
    --color-gray-lighter: #6b7280;
    --color-gray-bg: #111827;
    --color-white: #1f2937;
    --color-success: #34d399;
    --shadow-sm: 0 2px 10px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
    --shadow-lg: 0 6px 24px rgba(0,0,0,0.5);
    --footer-bg: #0f172a;
    --footer-color: #f1f5f9;
    --footer-border: 1px solid #1e293b;
}

/* System preference detection */
@media (prefers-color-scheme: dark) {
    :root {
        --color-primary: #3b82f6;
        --color-primary-hover: #2563eb;
        --color-gray-dark: #f3f4f6;
        --color-gray-medium: #d1d5db;
        --color-gray-light: #9ca3af;
        --color-gray-lighter: #6b7280;
        --color-gray-bg: #111827;
        --color-white: #1f2937;
        --color-success: #34d399;
        --shadow-sm: 0 2px 10px rgba(0,0,0,0.3);
        --shadow-md: 0 4px 20px rgba(0,0,0,0.4);
        --shadow-lg: 0 6px 24px rgba(0,0,0,0.5);
        --footer-bg: #0f172a;
        --footer-color: #f1f5f9;
        --footer-border: 1px solid #1e293b;
    }
}

/* Override system preference when manual theme is set */
body.light {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-gray-dark: #1e293b;
    --color-gray-medium: #4b5563;
    --color-gray-light: #64748b;
    --color-gray-lighter: #94a3b8;
    --color-gray-bg: #f8fafc;
    --color-white: #fff;
    --color-success: #10b981;
    --shadow-sm: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 6px 24px rgba(0,0,0,0.12);
    --footer-bg: var(--color-gray-dark);
    --footer-color: var(--color-white);
    --footer-border: none;
}

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

html {
    /* Overlay scrollbar approach - floats over content without affecting layout */
    overflow: overlay;
    /* Fallback for browsers that don't support overlay */
    overflow-y: auto;
}

/* Custom overlay scrollbar styling */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 6px;
    border: 2px solid transparent;
    background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
    background-clip: content-box;
}

/* Dark mode scrollbar */
body.dark ::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    background-clip: content-box;
}

body.dark ::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
    background-clip: content-box;
}

/* Firefox overlay scrollbar */
html {
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
}

body.dark {
    scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

/* Active navigation link styling */
.nav-menu a.active {
    color: var(--logo-green);
    font-weight: 600;
}

/* References Page Styles */
.references-hero {
    background: linear-gradient(135deg, #667eea -50%, var(--logo-green) 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.references {
    padding: 80px 0;
    background: var(--color-gray-bg);
}

.references-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.reference-card {
    background: var(--color-white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 2rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 4px solid var(--logo-green);
}

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

.reference-header {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.reference-icon {
    background: var(--logo-green);
    color: white;
    padding: 0.75rem;
    border-radius: var(--border-radius-sm);
    flex-shrink: 0;
}

.reference-icon i {
    width: 24px;
    height: 24px;
    stroke-width: 2;
}

.reference-meta {
    flex: 1;
}

.reference-client {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-gray-dark);
    margin: 0 0 0.25rem 0;
}

.reference-period {
    color: var(--color-gray-medium);
    font-size: 0.9rem;
    font-weight: 500;
}

.reference-project {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-gray-dark);
    margin: 0 0 1rem 0;
}

.reference-description {
    color: var(--color-gray-medium);
    line-height: 1.6;
    margin-bottom: 1.5rem;
}

.reference-achievements {
    list-style: none;
    margin-bottom: 1.5rem;
}

.reference-achievements li {
    color: var(--color-gray-dark);
    padding: 0.25rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.reference-achievements li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--logo-green);
    font-weight: bold;
}

.reference-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    background: var(--color-gray-bg);
    color: var(--color-gray-dark);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid var(--color-gray-lighter);
    transition: all 0.3s ease;
}

.tech-tag:hover {
    background: var(--logo-green);
    color: white;
    border-color: var(--logo-green);
}

.reference-testimonial {
    background: var(--color-gray-bg);
    border-left: 4px solid var(--logo-green);
    padding: 1rem 1.5rem;
    margin: 0;
    font-style: italic;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
}

.reference-testimonial cite {
    display: block;
    margin-top: 0.5rem;
    font-style: normal;
    font-weight: 600;
    color: var(--color-gray-medium);
    font-size: 0.9rem;
}

.references-cta {
    text-align: center;
    background: var(--color-white);
    padding: 3rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    margin-top: 2rem;
}

.references-cta h3 {
    font-size: 1.5rem;
    color: var(--color-gray-dark);
    margin-bottom: 1rem;
}

.references-cta p {
    color: var(--color-gray-medium);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Dark mode references styling */
body.dark .tech-tag {
    background: #1f2937;
    color: #d1d5db;
    border-color: #374151;
}

body.dark .tech-tag:hover {
    background: var(--logo-green);
    color: white;
    border-color: var(--logo-green);
}

body.dark .reference-testimonial {
    background: #1f2937;
    border-left-color: var(--logo-green);
}

/* Mobile responsive for references */
@media (max-width: 768px) {
    .references-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .reference-card {
        padding: 1.5rem;
    }

    .reference-header {
        flex-direction: column;
        gap: 0.5rem;
    }

    .reference-icon {
        align-self: flex-start;
    }

    .references-cta {
        padding: 2rem 1rem;
    }

    .references-hero {
        padding: 100px 0 60px;
    }
}

@media (max-width: 480px) {
    .references {
        padding: 60px 0;
    }

    .reference-card {
        padding: 1rem;
    }

    .references-cta {
        padding: 1.5rem 1rem;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--color-gray-dark);
    background-color: var(--color-gray-bg);
    scroll-behavior: smooth;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Enhanced transitions for smoother theme switching */
.nav,
.service-card,
.contact-method,
.theme-toggle {
    transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Navigation */
.nav {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav .container {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 1rem;
    height: 65px;
    gap: 1rem;
}

.nav-brand {
    grid-column: 1;
    justify-self: start;
}

.nav-brand h2 {
    color: var(--color-primary);
    font-size: 1.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    grid-column: 2;
    justify-self: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--color-gray-dark);
    font-weight: 500;
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--logo-green);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 4px;
    border-radius: var(--border-radius-sm);
    grid-column: 3;
    justify-self: end;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-gray-dark);
    margin: 3px 0;
    transition: var(--transition);
}

.nav img.nav-logo {
    height: 65px;
    margin-top: -1rem;
    margin-bottom: -1rem;
    transition: opacity 0.3s ease;
}

/* Theme-aware logo switching */
.nav .nav-logo-light {
    display: inline;
}

.nav .nav-logo-dark {
    display: none;
}

body.dark .nav .nav-logo-light {
    display: none;
}

body.dark .nav .nav-logo-dark {
    display: inline;
}

.nav-controls {
    grid-column: 3;
    justify-self: end;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.language-switcher {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
}

.lang-current {
    color: var(--color-primary);
    font-weight: 600;
}

.lang-link {
    color: var(--color-gray-medium);
    text-decoration: none;
    transition: var(--transition);
}

.lang-link:hover {
    color: var(--logo-green);
}

.lang-separator {
    color: var(--color-gray-lighter);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea -50%, var(--logo-green) 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

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

.btn {
    padding: 12px 24px;
    border-radius: var(--border-radius-sm);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    display: inline-block;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background: var(--color-gray-bg);
    transform: translateY(-2px);
}

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

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

/* Services Section */
.services {
    padding: 40px 0;
    background: var(--color-gray-bg);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--color-gray-dark);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.service-card {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

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

.service-icon {
    margin-bottom: 1rem;
    color: var(--logo-green);
}

.service-icon i {
    width: 48px;
    height: 48px;
    stroke-width: 1.5;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-gray-dark);
}

.service-card p {
    color: var(--color-gray-medium);
    line-height: 1.6;
}

/* About Section */
.about {
    padding: 0 0;
}

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

.about p {
    font-size: 1.1rem;
    color: var(--color-gray-medium);
    margin-bottom: 1rem;
    text-align: justify;
}

.about a {
    color: var(--logo-green);
    text-decoration: none;
    transition: var(--transition);
}

.about a:hover {
    text-decoration: underline;
}

.tech-stack, .approach {
    margin-top: 2rem;
}

.tech-stack h3, .approach h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--color-gray-dark);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 2rem;
}

.tag {
    background: var(--tag-bg, #e2e8f0);
    color: var(--tag-color, var(--color-gray-medium));
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 500;
    transition: background 0.3s ease, color 0.3s ease;
}

.approach ul {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.5rem;
}

.approach li {
    color: var(--color-gray-medium);
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.approach li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--logo-green);
    font-weight: bold;
}

/* Contact Section */
.contact {
    margin-top:40px;
    background: var(--color-gray-bg);
    text-align: center;
}

.contact-desc {
    font-size: 1.1rem;
    color: var(--color-gray-medium);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.contact-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    margin-top: 2rem;
}

.contact-actions .btn {
    display: inline-flex;
    align-items: center;
    color: var(--color-gray-dark);
    gap: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
}

.contact-actions button.btn {
    font-family: inherit;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
}

.contact-actions .btn i {
    width: 18px;
    height: 18px;
    stroke-width: 1.5;
}

.copy-confirmation {
    margin-top: 1rem;
    color: var(--color-success);
    font-weight: 500;
    font-size: 0.95rem;
    min-height: 1.5rem;
}

/* Footer */
.footer {
    /*background: var(--footer-bg, var(--color-gray-dark));*/
    background: linear-gradient(135deg, #667eea -50%, var(--logo-green) 100%);
    color: var(--footer-color, var(--color-white));
    text-align: center;
    padding: 1rem 0;
    transition: background 0.3s ease, color 0.3s ease;
    border-top: var(--footer-border, none);
}

body.light .footer {
    background: linear-gradient(135deg, #667eea -50%, var(--logo-green) 100%);
}

body.dark .footer {
    background: var(--color-white);
}

.footer-links {
    margin-top: 1rem;
    font-size: 0.9rem;
}

.footer-links a {
    color: var(--footer-color, var(--color-white));
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav .container {
        display: grid;
        grid-template-columns: 1fr auto 1fr;
        align-items: center;
        gap: 0.5rem;
    }

    .nav-brand {
        grid-column: 2;
        justify-self: center;
    }

    .nav-controls {
        grid-column: 3;
        justify-self: end;
        gap: 0.5rem;
    }

    .language-switcher {
        font-size: 0.8rem;
    }

    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--color-white);
        flex-direction: column;
        box-shadow: var(--shadow-sm);
        grid-column: unset;
        justify-self: unset;
    }

    .nav-menu.active {
        display: block;
    }

    .nav-menu.active li:nth-child(odd){
        background: var(--color-gray-bg);
    }

    .nav-menu.active li{
        height: 3rem;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    /*.nav-menu.active li:nth-child(even){*/
    /*    background: var(--color-gray-lighter);*/
    /*}*/
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 2px solid var(--color-gray-lighter);
    border-radius: var(--border-radius-sm);
    color: var(--color-gray-dark);
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--transition);
    grid-column: 3;
    justify-self: end;
}

.theme-toggle:hover {
    border-color: var(--logo-green);
    color: var(--logo-green);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

/* Hide/show theme icons based on current theme */
.theme-toggle .sun-icon {
    display: block;
}

.theme-toggle .moon-icon {
    display: none;
}

body.dark .theme-toggle .sun-icon {
    display: none;
}

body.dark .theme-toggle .moon-icon {
    display: block;
}

/* Dark mode specific overrides */
body.dark .tag {
    --tag-bg: #1f2937;
    --tag-color: #d1d5db;
    border: 1px solid #374151;
}

/* Dark mode button contrast fixes */
body.dark .btn-primary {
    background: var(--logo-green);
    color: #ffffff;
    border: 2px solid #ffffff;
}

body.dark .btn-primary:hover {
    background: var(--color-white);
    color: #ffffff;
    transform: translateY(-2px);
}

/* Dark mode secondary button contrast fixes */
body.dark .contact-actions .btn-secondary {
    background: transparent;
    color: var(--color-gray-dark);
    border: 2px solid var(--color-gray-dark);
}

body.dark .contact-actions .btn-secondary:hover {
    background: var(--color-gray-dark);
    color: var(--color-gray-bg);
}



@media (max-width: 768px) {
    .theme-toggle {
        margin-left: 0;
        padding: 0.4rem;
    }

    .theme-toggle svg {
        width: 18px;
        height: 18px;
    }

    .nav-toggle {
        display: flex;
        grid-column: 1;
        justify-self: start;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 2rem;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    .contact-actions {
        flex-direction: column;
        align-items: center;
    }

    .contact-actions .btn {
        min-width: auto;
        width: 100%;
        max-width: 280px;
    }

    .approach ul {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 0.5rem;
    }

    .hero {
        padding: 100px 0 60px;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .services, .about, .contact {
        padding: 30px 0;
    }

    .service-card {
        padding: 1.5rem;
    }
}