:root {
    --primary-color: #91AF9D;
    --text-dark: #1F2937;
    --text-light: #6B7280;
    --bg-page: #E5E7EB;
    --device-border: #1F2937;
    --app-text-dark: #2B2D42;
    --app-text-light: #EDF2F4;
    --app-text-secondary: #8D99AE;
    --app-text-info-dark: #415A77;
    --app-text-info-light: #778DA9;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body {
    background-color: var(--bg-page);
    color: var(--text-dark);
    line-height: 1.6;
    padding: 2rem 0;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background-color: white;
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,0.1);
    overflow: hidden;
}

/* Navbar */
header {
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #F3F4F6;
}

.logo { font-size: 1.5rem; font-weight: 800; color: var(--primary-color); text-decoration: none; }
.nav-links a { margin-left: 2rem; text-decoration: none; color: var(--text-dark); font-weight: 600; }

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 5rem 3rem;
    background: linear-gradient(135deg, #F8FAFC 0%, #EEF2FF 100%);
}

.hero-content { flex: 1; padding-right: 3rem; }
.hero-content h1 { font-size: 3.5rem; font-weight: 800; line-height: 1.2; margin-bottom: 1.5rem; }
.hero-content p { font-size: 1.1rem; color: var(--text-light); margin-bottom: 2rem; }

.download-btn {
    background: #000;
    color: white;
    padding: 1rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
    transition: transform 0.2s;
}
.download-btn:hover { transform: translateY(-2px); }

/* Phone Mockup */
.phone-mockup {
    width: 300px;
    height: 620px;
    background-color: var(--device-border);
    border-radius: 50px;
    padding: 12px;
    position: relative;
    flex-shrink: 0;
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.phone-screen {
    width: 100%; height: 100%;
    background-color: #000;
    border-radius: 38px;
    overflow: hidden;
    position: relative;
}

.phone-screen img {
    position: absolute; top: 0; left: 0;
    width: 100%; height: 100%;
    object-fit: cover; opacity: 0;
    transition: opacity 0.8s ease-in-out;
}
.phone-screen img.active { opacity: 1; }

/* Features Section */
.features-section { padding: 5rem 3rem; background: white; }
.section-title { text-align: center; font-size: 2rem; margin-bottom: 3rem; }

.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.feature-card {
    padding: 2rem 1.5rem;
    background-color: #F9FAFB;
    border-radius: 16px;
    text-align: center;
    border: 1px solid transparent;
    transition: all 0.3s ease;
}

.feature-card .icon i {
    color: var(--primary-color);
    font-size: 2.5rem;
}

.feature-card:hover { transform: translateY(-5px); border-color: #E5E7EB; box-shadow: 0 10px 20px rgba(0,0,0,0.05); }
.feature-card .icon { font-size: 2.5rem; margin-bottom: 1rem; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; color: var(--text-dark); }
.feature-card p { font-size: 0.9rem; color: var(--text-light); }

/* Showcase Slider Section */
.showcase-section {
    padding: 5rem 3rem;
    background-color: #F8FAFC;
    border-top: 1px solid #F3F4F6;
}
.showcase-wrapper { display: flex; align-items: center; gap: 5rem; }

/* CSS Grid Hack: İç içe geçmeyi ve yükseklik problemini çözer */
.showcase-info {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
}

.info-slide {
    grid-column: 1;
    grid-row: 1;
    opacity: 0;
    transform: translateY(20px);
    visibility: hidden;
    transition: all 0.5s ease;
    pointer-events: none; /* Alttaki katmanların tıklanmasını engeller */
}

.info-slide.active {
    opacity: 1;
    transform: translateY(0);
    visibility: visible;
    pointer-events: auto;
}

.info-slide h2 { font-size: 2.2rem; margin-bottom: 1rem; color: var(--primary-color); }
.info-slide p { font-size: 1.1rem; color: var(--text-light); }

.slider-dots { display: flex; gap: 12px; margin-top: 2rem; }
.dot { width: 12px; height: 12px; background: #CBD5E1; border-radius: 50%; cursor: pointer; transition: 0.3s; }
.dot:hover { background: #94A3B8; }
.dot.active { background: var(--primary-color); width: 30px; border-radius: 10px; }

/* CTA Download Section */
.cta-section {
    padding: 5rem 3rem;
    background-color: var(--primary-color);
    color: white;
    text-align: center;
}

.cta-section h2 { font-size: 2.5rem; margin-bottom: 1rem; }
.cta-section p { font-size: 1.1rem; max-width: 600px; margin: 0 auto 2rem auto; opacity: 0.9; }

.app-store-btn {
    display: inline-flex;
    align-items: center;
    background-color: black;
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    transition: transform 0.2s;
    border: 1px solid rgba(255,255,255,0.2);
}
.app-store-btn:hover { transform: scale(1.05); }
.app-store-btn svg { width: 30px; height: 30px; margin-right: 12px; fill: white; }
.app-store-btn .texts { display: flex; flex-direction: column; text-align: left; }
.app-store-btn .small { font-size: 0.7rem; letter-spacing: 0.5px; }
.app-store-btn .big { font-size: 1.2rem; font-weight: 600; line-height: 1; }

/* Footer */
footer {
    padding: 2rem 3rem;
    background-color: white;
    border-top: 1px solid #F3F4F6;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-light);
    font-size: 0.9rem;
}
.made-with-love { font-weight: 600; color: #1F2937; }

/* Responsive */
@media (max-width: 992px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .hero { flex-direction: column; text-align: center; }
    .hero-content { padding-right: 0; margin-bottom: 3rem; }
    .showcase-wrapper { flex-direction: column; gap: 3rem; }
    .slider-dots { justify-content: center; }
}

@media (max-width: 768px) {
    header { flex-direction: column; gap: 1rem; }
    .nav-links a { margin: 0 1rem; }

    /* Metinlerin merkeze hizalanması (Senin isteğin) */
    .showcase-info { text-align: center; }
    .info-slide h2 { font-size: 1.8rem; }

    .footer { flex-direction: column; gap: 1rem; text-align: center; }
}

@media (max-width: 600px) {
    body { padding: 0; }
    .container { border-radius: 0; }
    .features-grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 2.5rem; }
    footer { flex-direction: column; gap: 1rem; }
}