/* ==========================================================================
   Dersteyim.net — Pure Flat Modern Stylesheet
   Rules Enforced:
   - 100% ZERO Drop Shadows (box-shadow: none everywhere)
   - 100% ZERO Glow Effects (no blur, no glow, no light emission)
   - 100% Single Unified Font Family (Plus Jakarta Sans throughout the whole site)
   - 100% Solid Flat Surfaces (No transparency, no semi-transparent fills)
   - Direct Screenshot Slider (No Phone Frame Bezel)
   - Upgraded Rich FAQ Accordion
   ========================================================================== */

/* --- CSS Variables & Solid Color Tokens --- */
:root {
    --bg-dark: #1A1A2E;
    --bg-nav: #161628;
    --bg-card: #252542;
    --bg-card-hover: #2D2D50;
    --bg-input: #1E1E36;
    
    --border-color: #3A3A5C;
    --border-yellow: #FFCE00;
    
    --primary-yellow: #FFCE00;
    --primary-yellow-hover: #E5B800;

    --text-white: #FFFFFF;
    --text-sub: #CBD5E1;
    --text-muted: #8888A0;
    
    /* Single Unified Font Family */
    --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
}

/* --- Global Reset & Single Font Enforcement --- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    box-shadow: none !important; /* ABSOLUTE ZERO DROP SHADOWS GLOBALLY */
    text-shadow: none !important;
    filter: none !important;
}

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

body, h1, h2, h3, h4, h5, h6, p, span, a, button, input, div, section, nav, footer {
    font-family: var(--font-family) !important;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-white);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

button {
    cursor: pointer;
    border: none;
    outline: none;
}

/* --- Solid Flat Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1rem 0;
    background: var(--bg-nav);
    border-bottom: 2px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.brand-logo {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 2px solid var(--primary-yellow);
    object-fit: cover;
    background: var(--primary-yellow);
}

.brand-name {
    font-size: 1.45rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--text-white);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2.2rem;
}

.nav-link {
    color: var(--text-sub);
    font-weight: 700;
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Solid Buttons (No Shadows, No Transparency) */
.btn-qr {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-card);
    color: var(--text-sub);
    border: 2px solid var(--border-color);
    padding: 0.65rem 1.2rem;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 700;
    transition: var(--transition-fast);
}

.btn-qr:hover {
    background: var(--bg-card-hover);
    color: var(--text-white);
    border-color: var(--primary-yellow);
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.6rem;
    background: var(--primary-yellow);
    color: #1A1A2E;
    font-weight: 800;
    padding: 0.7rem 1.6rem;
    border-radius: var(--radius-full);
    font-size: 0.95rem;
    border: 2px solid var(--primary-yellow);
    transition: var(--transition-fast);
}

.btn-primary:hover {
    background: var(--primary-yellow-hover);
    border-color: var(--primary-yellow-hover);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    padding-top: 8.5rem;
    padding-bottom: 5rem;
    background: var(--bg-dark);
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 3.5rem;
    align-items: center;
}

.badge-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--bg-card);
    border: 2px solid var(--border-yellow);
    color: var(--primary-yellow);
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.05em;
    margin-bottom: 1.5rem;
}

.badge-dot {
    width: 8px;
    height: 8px;
    background-color: var(--primary-yellow);
    border-radius: 50%;
}

.hero-title {
    font-size: 3.3rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.035em;
    margin-bottom: 1.25rem;
}

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

.hero-subtitle {
    color: var(--text-sub);
    font-size: 1.15rem;
    line-height: 1.65;
    margin-bottom: 2.25rem;
    max-width: 540px;
    font-weight: 500;
}

.hero-subtitle strong {
    color: var(--text-white);
    font-weight: 700;
}

.hero-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-bottom: 2.5rem;
}

/* Google Play Solid Badge Button */
.btn-google-play {
    display: inline-flex;
    align-items: center;
    gap: 0.9rem;
    background: var(--primary-yellow);
    color: #1A1A2E;
    border: 2px solid var(--primary-yellow);
    padding: 0.8rem 1.6rem;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.btn-google-play:hover {
    background: var(--primary-yellow-hover);
    border-color: var(--primary-yellow-hover);
}

.gp-icon {
    font-size: 2rem;
    color: #1A1A2E;
}

.gp-text {
    display: flex;
    flex-direction: column;
    text-align: left;
}

.gp-small {
    font-size: 0.72rem;
    color: #1A1A2E;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.gp-big {
    font-size: 1.1rem;
    font-weight: 800;
    color: #1A1A2E;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--bg-card);
    color: var(--text-white);
    border: 2px solid var(--border-color);
    font-weight: 700;
    padding: 0.85rem 1.5rem;
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--primary-yellow);
    color: var(--primary-yellow);
}

.hero-stats-mini {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    padding-top: 1.25rem;
    border-top: 2px solid var(--border-color);
}

.stat-mini-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-sub);
    font-weight: 600;
}

.yellow-star { color: var(--primary-yellow); }
.cyan-bolt { color: var(--accent-cyan); }
.green-shield { color: var(--accent-green); }

.stat-mini-divider {
    width: 2px;
    height: 16px;
    background: var(--border-color);
}

/* --- Direct Screenshot Slider Showcase (No Phone Frame Bezel) --- */
.hero-visual {
    display: flex;
    justify-content: center;
}

.direct-slider-card {
    position: relative;
    width: 100%;
    max-width: 380px;
    background: var(--bg-card);
    border: 3px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
}

.slider-wrapper {
    position: relative;
    width: 100%;
    border-radius: 16px;
    overflow: hidden;
    background: #000;
    border: 2px solid var(--border-color);
}

.slider-track {
    display: flex;
    transition: transform 0.4s ease-in-out;
    width: 100%;
}

.slide-item {
    min-width: 100%;
    box-sizing: border-box;
}

.slide-img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
}

/* Slider Navigation Controls */
.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 2px solid var(--primary-yellow);
    color: var(--primary-yellow);
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    z-index: 10;
}

.slider-btn.prev { left: 10px; }
.slider-btn.next { right: 10px; }

.slider-btn:hover {
    background: var(--primary-yellow);
    color: #1A1A2E;
}

.slider-caption-box {
    margin-top: 14px;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    text-align: center;
}

.caption-tag {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--primary-yellow);
    letter-spacing: 0.08em;
    display: block;
    margin-bottom: 2px;
}

.caption-title {
    font-size: 1.05rem;
    font-weight: 800;
    color: var(--text-white);
}

/* --- Section Layout --- */
.section {
    padding: 6rem 0;
    position: relative;
    background: var(--bg-dark);
}

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section-header {
    margin-bottom: 3.5rem;
}

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

.section-tag {
    font-size: 0.85rem;
    font-weight: 800;
    letter-spacing: 0.12em;
    color: var(--primary-yellow);
    text-transform: uppercase;
    margin-bottom: 0.6rem;
    display: block;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 0.8rem;
}

.section-desc {
    color: var(--text-sub);
    font-size: 1.08rem;
    max-width: 600px;
    margin: 0 auto;
    font-weight: 500;
}

/* --- Full App Screenshots Carousel --- */
.screenshots-section {
    background: #141424;
    border-top: 2px solid var(--border-color);
    border-bottom: 2px solid var(--border-color);
}

.carousel-container {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
}

.carousel-track-wrapper {
    overflow: hidden;
    padding: 10px 0;
}

.carousel-track {
    display: flex;
    gap: 2rem;
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.carousel-card {
    min-width: calc(33.333% - 1.35rem);
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition-fast);
    box-sizing: border-box;
}

.carousel-card.active {
    border-color: var(--primary-yellow);
}

.card-img-holder {
    width: 100%;
    border-radius: 12px;
    overflow: hidden;
    background: #000;
    margin-bottom: 1.2rem;
    border: 2px solid var(--border-color);
}

.card-img-holder img {
    width: 100%;
    height: auto;
    display: block;
}

.card-info {
    display: flex;
    flex-direction: column;
}

.card-step {
    font-size: 1rem;
    font-weight: 800;
    color: var(--primary-yellow);
    margin-bottom: 0.2rem;
}

.card-info h3 {
    font-size: 1.2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--text-white);
}

.card-info p {
    font-size: 0.9rem;
    color: var(--text-sub);
    line-height: 1.55;
    font-weight: 500;
}

/* Carousel Controls */
.carousel-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 2.5rem;
    padding: 0 1rem;
}

.btn-carousel-nav {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    background: var(--bg-card);
    color: var(--text-white);
    border: 2px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-full);
    font-weight: 800;
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.btn-carousel-nav:hover {
    border-color: var(--primary-yellow);
    color: var(--primary-yellow);
    background: var(--bg-card-hover);
}

.carousel-dots {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border-color);
    cursor: pointer;
    transition: var(--transition-fast);
}

.dot.active {
    width: 28px;
    border-radius: 10px;
    background: var(--primary-yellow);
}

/* --- NEW: Reklamsız, Ücretsiz & Sınırsız Section --- */
.ucretsiz-section {
    background: var(--bg-dark);
}

.ucretsiz-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.ucretsiz-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    transition: var(--transition-fast);
}

.ucretsiz-card:hover {
    border-color: var(--primary-yellow);
    background: var(--bg-card-hover);
}

.ucretsiz-icon {
    width: 58px;
    height: 58px;
    border-radius: 16px;
    background: var(--primary-yellow);
    color: #1A1A2E;
    border: 2px solid var(--primary-yellow);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
}

.ucretsiz-card h3 {
    font-size: 1.4rem;
    font-weight: 800;
    margin-bottom: 0.8rem;
    color: var(--text-white);
}

.ucretsiz-card p {
    color: var(--text-sub);
    font-size: 1rem;
    line-height: 1.65;
    font-weight: 500;
}

/* --- Features Grid --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.75rem;
}

.feature-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 2rem;
    transition: var(--transition-fast);
}

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

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 1.4rem;
    background: var(--primary-yellow);
    color: #1A1A2E;
    border: 2px solid var(--primary-yellow);
}

.feature-title {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 0.75rem;
}

.feature-desc {
    color: var(--text-sub);
    font-size: 0.95rem;
    line-height: 1.6;
    font-weight: 500;
}

/* --- UPGRADED FAQ Accordion --- */
.faq-accordion {
    max-width: 850px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.faq-item {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-fast);
}

.faq-item:hover {
    border-color: var(--border-yellow);
}

.faq-item.active {
    border-color: var(--primary-yellow);
}

.faq-question {
    width: 100%;
    text-align: left;
    background: transparent;
    color: var(--text-white);
    padding: 1.4rem 1.8rem;
    font-size: 1.1rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.faq-q-text {
    display: flex;
    align-items: center;
    gap: 0.85rem;
}

.faq-q-icon {
    color: var(--primary-yellow);
    font-size: 1.2rem;
}

.faq-icon {
    color: var(--text-sub);
    transition: var(--transition-fast);
    font-size: 1rem;
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
    color: var(--primary-yellow);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    background: var(--bg-dark);
}

.faq-answer p {
    padding: 0 1.8rem 1.5rem 3.8rem;
    color: var(--text-sub);
    font-size: 1rem;
    line-height: 1.7;
    font-weight: 500;
}

.faq-answer strong {
    color: var(--primary-yellow);
    font-weight: 800;
}

/* --- Download Banner --- */
.download-banner-section {
    padding-bottom: 6rem;
}

.download-banner-card {
    background: var(--bg-card);
    border: 2px solid var(--border-yellow);
    border-radius: var(--radius-lg);
    padding: 4.5rem 2rem;
    text-align: center;
}

.banner-title {
    font-size: 2.3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.banner-desc {
    color: var(--text-sub);
    font-size: 1.15rem;
    max-width: 580px;
    margin: 0 auto 2.5rem auto;
    font-weight: 500;
}

.banner-actions {
    display: flex;
    justify-content: center;
}

/* --- Footer --- */
.footer {
    background: #121222;
    border-top: 2px solid var(--border-color);
    padding: 4.5rem 0 2rem 0;
    font-size: 0.92rem;
    color: var(--text-sub);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 3fr;
    gap: 4rem;
    margin-bottom: 3rem;
}

.footer-bio {
    margin-top: 1rem;
    font-size: 0.9rem;
    max-width: 300px;
    color: var(--text-muted);
    font-weight: 500;
}

.footer-links-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-col h4 {
    color: var(--text-white);
    font-size: 1rem;
    font-weight: 800;
    margin-bottom: 1.25rem;
}

.footer-col a, .footer-col span {
    display: block;
    color: var(--text-sub);
    margin-bottom: 0.8rem;
    transition: var(--transition-fast);
    font-weight: 600;
}

.footer-col a:hover {
    color: var(--primary-yellow);
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 2px solid var(--border-color);
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

/* --- QR Code Modal --- */
.qr-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-dark);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-fast);
}

.qr-modal.active {
    opacity: 1;
    pointer-events: auto;
}

.qr-modal-content {
    background: var(--bg-card);
    border: 2px solid var(--border-yellow);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    max-width: 380px;
    width: 100%;
    text-align: center;
    position: relative;
}

.qr-close {
    position: absolute;
    top: 1rem;
    right: 1.25rem;
    background: transparent;
    color: var(--text-sub);
    font-size: 1.8rem;
}

.qr-close:hover { color: var(--text-white); }

.qr-icon {
    font-size: 2.2rem;
    color: var(--primary-yellow);
    margin-bottom: 0.75rem;
}

.qr-header h3 {
    font-size: 1.35rem;
    font-weight: 800;
    margin-bottom: 0.4rem;
}

.qr-header p {
    font-size: 0.88rem;
    color: var(--text-sub);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.qr-code-wrapper {
    background: #FFF;
    padding: 1rem;
    border-radius: var(--radius-md);
    display: inline-block;
    margin-bottom: 1.5rem;
}

.qr-img {
    width: 180px;
    height: 180px;
    display: block;
}

.full-width { width: 100%; }

/* --- Responsive Media Queries --- */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 3.5rem;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats-mini {
        justify-content: center;
    }

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

    .carousel-card {
        min-width: calc(50% - 1rem);
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    
    .hero-title {
        font-size: 2.4rem;
    }

    .carousel-card {
        min-width: 100%;
    }

    .faq-answer p {
        padding-left: 1.8rem;
    }

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

    .footer-links-group {
        grid-template-columns: 1fr;
    }
}