/* Temel Ayarlar ve Modern Tema */
:root {
    --primary-yellow: #ffd700; /* Altın sarısı, daha canlı */
    --dark-bg: #0a0a0a; /* Koyu siyah arka plan */
    --light-text: #f0f0f0;
    --dark-text: #121212;
    --card-bg: #1a1a1a;
    --border-color: #333;
    --scroll-behavior: smooth;
}

html {
    scroll-behavior: var(--scroll-behavior);
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Poppins', sans-serif;
    background-color: var(--dark-bg);
    color: var(--light-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s;
}

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

.logo {
    font-size: 2em;
    font-weight: 700;
    color: var(--primary-yellow);
    letter-spacing: 2px;
}

nav a {
    color: var(--light-text);
    text-decoration: none;
    margin: 0 15px;
    font-weight: 600;
    position: relative;
    padding-bottom: 5px;
}

nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-yellow);
    transition: width 0.3s ease-in-out;
}

nav a:hover::after {
    width: 100%;
}

.login-button {
    background-color: var(--primary-yellow);
    color: var(--dark-text);
    padding: 10px 25px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 700;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.2);
}

.login-button:hover {
    background-color: #fff;
    color: var(--dark-text);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.2);
}

/* Hero Section */
.hero {
    background: linear-gradient(rgba(10, 10, 10, 0.7), rgba(10, 10, 10, 0.9)), url('https://images.unsplash.com/photo-1523899384950-a92434472138?q=80&w=1740&auto=format&fit=crop') no-repeat center center/cover;
    padding: 100px 0;
    text-align: center;
    color: #fff;
}

.hero-content {
    max-width: 750px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3em;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero p {
    font-size: 1.2em;
    margin-bottom: 30px;
}

.login-button-main {
    background-color: var(--primary-yellow);
    color: var(--dark-text);
    padding: 15px 40px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 1.2em;
    font-weight: 700;
    transition: all 0.3s ease;
    display: inline-block;
    box-shadow: 0 4px 20px rgba(255, 215, 0, 0.3);
}

.login-button-main:hover {
    background-color: #fff;
    transform: scale(1.05);
}

/* Content & Articles */
.content {
    padding: 60px 20px;
}

.content-image {
    width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 40px 0;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

article {
    background: var(--card-bg);
    padding: 30px;
    margin-bottom: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: transform 0.3s, box-shadow 0.3s;
}

article:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
}

article h2 {
    color: var(--primary-yellow);
    font-size: 2em;
    margin-top: 0;
    margin-bottom: 15px;
}

article p {
    font-size: 1.1em;
}

/* SSS - FAQ */
#sss {
    margin-top: 60px;
}
#sss h2 {
    text-align: center;
    font-size: 2.5em;
    color: var(--primary-yellow);
    margin-bottom: 40px;
}

details {
    background-color: var(--card-bg);
    border-radius: 8px;
    margin-bottom: 10px;
    border-left: 3px solid var(--primary-yellow);
}

summary {
    font-weight: 600;
    font-size: 1.2em;
    cursor: pointer;
    padding: 20px;
    outline: none;
    color: var(--light-text);
    position: relative;
}

summary::after {
    content: '+';
    position: absolute;
    right: 20px;
    font-size: 1.5em;
    transition: transform 0.3s;
}

details[open] summary::after {
    transform: rotate(45deg);
}

details[open] summary {
    color: var(--primary-yellow);
}

details p {
    padding: 0 20px 20px 20px;
    border-top: 1px solid var(--border-color);
    margin-top: 10px;
}

/* Footer */
footer {
    background-color: #000;
    text-align: center;
    padding: 40px 20px;
    margin-top: 40px;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: #aaa;
    font-size: 0.9em;
    margin: 5px 0;
}

/* Interaktif Elemanlar */
.back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--primary-yellow);
    color: var(--dark-text);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    text-align: center;
    line-height: 50px;
    font-size: 24px;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s;
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    header .container { flex-direction: column; gap: 15px; }
    nav { order: 3; }
    .logo { order: 1; }
    .login-button { order: 2; }
    .hero h1 { font-size: 2.2em; }
    article h2 { font-size: 1.8em; }
}