/* ================================================
   TechSoft - Professional Software Company
   Clean & Corporate Dark Theme
   ================================================ */

/* -------------------- CSS Variables -------------------- */
:root {
    /* Colors - Yüksek Yazılım Brand Colors (Purple-Magenta) */
    --primary: #7B2A8E;
    --primary-light: #9B3AAE;
    --primary-dark: #5B2A6E;
    --secondary: #E91E8C;
    
    /* Dark Theme */
    --dark-900: #0f172a;
    --dark-800: #1e293b;
    --dark-700: #334155;
    --dark-600: #475569;
    
    /* Neutrals */
    --gray-500: #64748b;
    --gray-400: #94a3b8;
    --gray-300: #cbd5e1;
    --gray-200: #e2e8f0;
    --gray-100: #f1f5f9;
    --white: #ffffff;
    
    /* Typography */
    --font-heading: 'Poppins', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    
    /* 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;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: 200ms ease;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-400);
    background: var(--dark-900);
    -webkit-font-smoothing: antialiased;
}

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

ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

/* Focus styles */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* -------------------- Utilities -------------------- */
.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-sm);
    z-index: 1000;
}

.skip-link:focus {
    top: var(--space-4);
}

/* -------------------- Typography -------------------- */
.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-family: var(--font-heading);
    font-size: 2.25rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--space-3);
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--gray-400);
    max-width: 500px;
    margin: 0 auto;
}

/* -------------------- Buttons -------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    font-family: var(--font-heading);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition);
}

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

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

.btn-white {
    background: var(--white);
    color: var(--dark-900);
}

.btn-white:hover {
    background: var(--gray-200);
}

.btn-outline {
    background: transparent;
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.3);
}

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

/* -------------------- Header -------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--space-4) 0;
    background: transparent;
    transition: background var(--transition);
}

.header.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo-svg {
    width: 36px;
    height: 36px;
}

.logo-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: var(--white);
    border-radius: var(--radius-sm);
    font-size: 1rem;
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--white);
}

.logo-text .highlight {
    color: var(--primary-light);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-list a {
    font-size: 0.9375rem;
    color: rgba(255,255,255,0.7);
    transition: color var(--transition);
    position: relative;
}

.nav-list a:hover {
    color: var(--white);
}

.nav-list a.active {
    color: var(--white);
}

.nav-list a.active::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    border-radius: var(--radius-full);
}

.nav-cta {
    padding: var(--space-2) var(--space-5);
    background: var(--primary);
    color: var(--white) !important;
    border-radius: var(--radius-md);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-2);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--white);
    transition: all var(--transition);
}

/* -------------------- Hero -------------------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-24) 0;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--dark-900) 0%, var(--dark-800) 50%, var(--dark-900) 100%);
    z-index: -1;
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--white);
    line-height: 1.15;
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--gray-400);
    margin-bottom: var(--space-8);
    line-height: 1.7;
}

/* -------------------- About -------------------- */
.about {
    padding: var(--space-20) 0;
    background: var(--dark-900);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
}

.feature-card {
    text-align: center;
    padding: var(--space-8);
    background: var(--dark-800);
    border-radius: var(--radius-lg);
    border: 1px solid var(--dark-700);
    transition: border-color var(--transition);
}

.feature-card:hover {
    border-color: var(--primary);
}

.feature-card i {
    font-size: 1.75rem;
    color: var(--primary-light);
    margin-bottom: var(--space-4);
}

.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--space-2);
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--gray-400);
}

/* -------------------- Services -------------------- */
.services {
    padding: var(--space-20) 0;
    background: var(--dark-800);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
}

.service-card {
    padding: var(--space-8);
    background: var(--dark-900);
    border-radius: var(--radius-lg);
    border: 1px solid var(--dark-700);
    transition: border-color var(--transition);
}

.service-card:hover {
    border-color: var(--primary);
}

.service-card i {
    font-size: 2rem;
    color: var(--primary-light);
    margin-bottom: var(--space-4);
}

.service-card h3 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: var(--space-2);
}

.service-card p {
    font-size: 0.9375rem;
    color: var(--gray-400);
}

/* -------------------- Projects -------------------- */
.projects {
    padding: var(--space-20) 0;
    background: var(--dark-900);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
}

.project-card {
    background: var(--dark-800);
    border-radius: var(--radius-lg);
    border: 1px solid var(--dark-700);
    overflow: hidden;
    transition: border-color var(--transition);
}

.project-card:hover {
    border-color: var(--primary);
}

.project-image {
    height: 140px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-700);
    margin: 0;
}

.project-image i {
    font-size: 2.5rem;
    color: var(--gray-500);
}

.project-info {
    padding: var(--space-5);
}

.project-tag {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-light);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.project-info h3 {
    font-family: var(--font-heading);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--white);
    margin: var(--space-1) 0;
}

.project-info p {
    font-size: 0.875rem;
    color: var(--gray-400);
}

/* -------------------- CTA -------------------- */
.cta {
    padding: var(--space-16) 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-content h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: var(--space-3);
}

.cta-content p {
    font-size: 1.0625rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: var(--space-8);
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    flex-wrap: wrap;
}

/* -------------------- Contact -------------------- */
.contact {
    padding: var(--space-20) 0;
    background: var(--dark-800);
}

.contact-form {
    max-width: 560px;
    margin: 0 auto;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
}

.form-group {
    margin-bottom: var(--space-5);
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--gray-300);
    margin-bottom: var(--space-2);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-4);
    font-size: 1rem;
    color: var(--white);
    background: var(--dark-900);
    border: 1px solid var(--dark-700);
    border-radius: var(--radius-md);
    transition: border-color var(--transition);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-500);
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
}

.contact-form .btn {
    width: 100%;
    padding: var(--space-4);
}

.contact-map {
    margin-top: var(--space-12);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.contact-map iframe {
    display: block;
    border-radius: var(--radius-lg);
}

/* -------------------- Footer -------------------- */
.footer {
    padding: var(--space-12) 0 var(--space-6);
    background: var(--dark-900);
    border-top: 1px solid var(--dark-700);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--space-8);
    border-bottom: 1px solid var(--dark-700);
    flex-wrap: wrap;
    gap: var(--space-6);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.footer-brand p {
    font-size: 0.9375rem;
    color: var(--gray-500);
    padding-left: var(--space-6);
    border-left: 1px solid var(--dark-700);
}

.footer-nav {
    display: flex;
    gap: var(--space-6);
}

.footer-nav a {
    font-size: 0.9375rem;
    color: var(--gray-400);
}

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

.footer-social {
    display: flex;
    gap: var(--space-3);
}

.footer-social a {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-800);
    color: var(--gray-400);
    border-radius: var(--radius-sm);
    transition: all var(--transition);
}

.footer-social a:hover {
    background: var(--primary);
    color: var(--white);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-6);
    flex-wrap: wrap;
    gap: var(--space-4);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--gray-500);
}

.footer-legal {
    display: flex;
    gap: var(--space-6);
}

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

.footer-legal a:hover {
    color: var(--primary-light);
}

/* -------------------- Back to Top -------------------- */
.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark-700);
    color: var(--white);
    border-radius: var(--radius-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition);
    z-index: 50;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary);
}

/* -------------------- Responsive -------------------- */

/* Hide scrollbar on mobile */
@media (max-width: 768px) {
    html {
        scrollbar-width: none; /* Firefox */
    }
    
    html::-webkit-scrollbar {
        display: none; /* Chrome, Safari, Edge */
    }
}

@media (max-width: 1024px) {
    .features-grid,
    .services-grid,
    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .hero-title {
        font-size: 2.75rem;
    }
}

@media (max-width: 768px) {
    .nav-list {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        background: var(--dark-900);
        padding: var(--space-8);
        transition: right var(--transition);
    }
    
    .nav-list.active {
        right: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.25rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .features-grid,
    .services-grid,
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .cta-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-brand {
        flex-direction: column;
    }
    
    .footer-brand p {
        padding-left: 0;
        border-left: none;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--space-4);
    }
    
    .hero-title {
        font-size: 1.875rem;
    }
    
    .cta-content h2 {
        font-size: 1.5rem;
    }
}