/* 
  STS Bilgisayar - Main Stylesheet
  Inspired by Apple's design language: Dark mode, glassmorphism, precise spacing, and elegant typography.
*/

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;600;700;800&display=swap');

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

:root {
    /* Color Palette */
    --bg-primary: #000000;
    --bg-secondary: #0c0c0e;
    --bg-tertiary: #16161a;
    --card-bg: rgba(22, 22, 26, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    --text-primary: #ffffff;
    --text-secondary: #86868b;
    --text-muted: #6e6e73;
    
    --accent-blue: #0071e3;
    --accent-blue-hover: #147ce5;
    --accent-glow: rgba(0, 113, 227, 0.3);
    --accent-gradient: linear-gradient(135deg, #0071e3 0%, #c72cda 100%);
    
    /* Fonts */
    --font-heading: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Animation Speeds */
    --transition-smooth: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    --transition-quick: all 0.2s ease;
}

html {
    scroll-behavior: smooth;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    overflow-x: hidden;
    line-height: 1.5;
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.02em;
}

/* --- Custom Scrollbar --- */
::-webkit-scrollbar {
    width: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 5px;
    border: 2px solid var(--bg-primary);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* --- Container --- */
.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- Header / Navbar --- */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-smooth);
}

header.scrolled {
    background-color: rgba(0, 0, 0, 0.85);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 48px; /* Classic Apple header height */
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 22px;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: 6px;
}

.logo span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

nav {
    display: flex;
    gap: 32px;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 400;
    transition: var(--transition-quick);
}

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

.nav-cta {
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 500;
    font-size: 0.8rem;
    transition: var(--transition-quick);
    text-decoration: none;
}

.nav-cta:hover {
    background: rgba(255, 255, 255, 0.9);
    transform: scale(1.02);
}

/* Mobile Menu Toggle Button */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
    background: none;
    border: none;
    z-index: 1001;
}

.menu-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition-quick);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    padding: 180px 0 100px 0;
    text-align: center;
    overflow: hidden;
}

.hero-background-gradient {
    position: absolute;
    top: -50%;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 100%;
    background: radial-gradient(circle, rgba(0, 113, 227, 0.15) 0%, rgba(199, 44, 218, 0.05) 50%, rgba(0, 0, 0, 0) 100%);
    filter: blur(80px);
    z-index: -1;
    pointer-events: none;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 20px;
    background: linear-gradient(180deg, #ffffff 0%, #86868b 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.8rem;
    }
}

.hero p {
    font-size: 1.4rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px auto;
    font-weight: 300;
}

@media (max-width: 768px) {
    .hero p {
        font-size: 1.1rem;
    }
}

.cta-group {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 980px;
    font-size: 1rem;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--accent-blue);
    color: var(--text-primary);
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
    box-shadow: 0 6px 20px rgba(0, 113, 227, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    border: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.08);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

/* --- Scroll Reveal Animation classes --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* --- Section Global Layout --- */
section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-label {
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 12px;
    display: inline-block;
}

.section-title {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

/* --- Products Section (Tab Menu & Cards) --- */
.product-menu {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 40px;
}

.product-menu-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1rem;
    padding: 8px 24px;
    cursor: pointer;
    border-radius: 980px;
    transition: var(--transition-quick);
}

.product-menu-btn:hover {
    color: var(--text-primary);
}

.product-menu-btn.active {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-primary);
    box-shadow: inset 0 0 0 1px var(--border-color);
}

.showcase-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 28px;
    padding: 60px;
    display: none; /* Tab sistemi için default kapalı */
    align-items: center;
    gap: 40px;
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.showcase-card.active {
    display: flex;
}

.showcase-card:hover {
    border-color: var(--border-hover);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.showcase-info {
    flex: 1;
}

.showcase-info .tag {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    background: rgba(255, 255, 255, 0.08);
    padding: 4px 10px;
    border-radius: 980px;
    display: inline-block;
    margin-bottom: 20px;
}

.showcase-info h3 {
    font-size: 2.2rem;
    margin-bottom: 15px;
}

.showcase-info p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.6;
    margin-bottom: 30px;
    font-weight: 300;
}

.store-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.store-btn {
    display: inline-flex;
    align-items: center;
    background: #1d1d1f;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    padding: 8px 16px;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition-quick);
}

.store-btn:hover {
    background: #2d2d30;
    border-color: var(--text-primary);
    transform: translateY(-2px);
}

.store-btn svg {
    margin-right: 10px;
    width: 24px;
    height: 24px;
    fill: currentColor;
}

.store-btn .store-text {
    display: flex;
    flex-direction: column;
}

.store-btn .store-subtitle {
    font-size: 0.6rem;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.store-btn .store-title {
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font-heading);
}

.showcase-image {
    flex: 1.2;
    display: flex;
    justify-content: center;
    align-items: center;
}

.showcase-image img {
    max-width: 100%;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    transition: var(--transition-smooth);
}

.showcase-card:hover .showcase-image img {
    transform: scale(1.02);
}

@media (max-width: 900px) {
    .showcase-card {
        flex-direction: column;
        padding: 40px 24px;
        text-align: center;
    }
    .showcase-image {
        margin-top: 20px;
    }
    .store-buttons {
        justify-content: center;
    }
}

/* --- Services / Solutions Grid --- */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.service-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 40px;
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.service-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-5px);
    background: rgba(22, 22, 26, 0.9);
}

.service-card .icon-wrapper {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--accent-blue);
    font-size: 1.8rem;
    transition: var(--transition-smooth);
}

.service-card:hover .icon-wrapper {
    background: var(--accent-gradient);
    color: var(--text-primary);
    box-shadow: 0 4px 15px rgba(0, 113, 227, 0.3);
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.service-card p {
    color: var(--text-secondary);
    font-weight: 300;
    line-height: 1.6;
    margin-bottom: 24px;
}

.service-card .link-arrow {
    display: inline-flex;
    align-items: center;
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition-quick);
}

.service-card .link-arrow svg {
    margin-left: 6px;
    transition: transform 0.2s ease;
}

.service-card:hover .link-arrow svg {
    transform: translateX(4px);
}

/* --- Enterprise (E-Transformation) Section --- */
.enterprise-showcase {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.enterprise-layout {
    display: flex;
    align-items: center;
    gap: 60px;
}

.enterprise-text {
    flex: 1;
}

.enterprise-text h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    line-height: 1.2;
}

.enterprise-text p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 30px;
    font-weight: 300;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.feature-item svg {
    color: var(--accent-blue);
    margin-top: 3px;
    flex-shrink: 0;
}

.feature-item div h4 {
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.feature-item div p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 0;
}

.enterprise-image-wrapper {
    flex: 1.2;
    display: flex;
    justify-content: center;
}

.enterprise-image-wrapper img {
    max-width: 100%;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
}

@media (max-width: 900px) {
    .enterprise-layout {
        flex-direction: column-reverse;
        gap: 40px;
    }
}

/* --- Contact & About Section --- */
.contact-section {
    background: var(--bg-primary);
}

.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 60px;
}

@media (max-width: 768px) {
    .contact-layout {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

.about-info h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.about-info p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 30px;
    font-weight: 300;
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-info-item .icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.contact-info-item .text h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.contact-info-item .text p {
    color: var(--text-primary);
    margin-bottom: 0;
    font-size: 1rem;
    font-weight: 400;
}

/* Form Styling */
.contact-form-wrapper {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 40px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px 16px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 0.95rem;
    transition: var(--transition-quick);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 4px var(--accent-glow);
}

textarea.form-control {
    resize: none;
    min-height: 120px;
}

.form-control::placeholder {
    color: var(--text-muted);
}

/* --- Footer --- */
footer {
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
    background-color: var(--bg-primary);
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-copy {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.8rem;
    transition: var(--transition-quick);
}

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

@media (max-width: 600px) {
    .footer-container {
        flex-direction: column;
        text-align: center;
    }
}

/* --- Mobile Menu Overlay --- */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: #000000;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 40px;
        transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
        z-index: 999;
    }
    
    nav.active {
        right: 0;
    }
    
    nav a {
        font-size: 1.5rem;
    }
    
    .nav-cta {
        font-size: 1.2rem;
        padding: 8px 24px;
        border-radius: 20px;
    }
    
    /* Toggle active state */
    .menu-toggle.active span:nth-child(1) {
        transform: translateY(6px) rotate(45deg);
    }
    .menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    .menu-toggle.active span:nth-child(3) {
        transform: translateY(-6px) rotate(-45deg);
    }
}