:root {
    /* Ana Renkler */
    --primary-dark: #0A2540;  /* Navbar, Footer, Koyu Başlıklar */
    --primary-blue: #1E88E5;  /* Linkler, Ana Butonlar (btn-primary) */
    --accent-orange: #FF9800; /* Vurgu, CTA Butonları, Etiketler */

    /* Light Mode (Varsayılan) */
    --bg-body: #F5F7FA;       /* Sayfa Arkaplanı */
    --bg-card: #FFFFFF;       /* Kart Arkaplanı */
    --text-main: #2c3e50;     /* Ana Metin Rengi */
    --text-muted: #7f8c8d;    /* İkincil Metin */
    --border-color: #e9ecef;  /* Kenarlıklar */
    --shadow-soft: 0 8px 24px rgba(149, 157, 165, 0.1); /* Yumuşak Gölge */
    
    /* Font */
    --font-main: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* Dark Mode Override */
body.dark-mode {
    --bg-body: #121212;
    --bg-card: #1E1E1E;
    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;
    --primary-dark: #000000;
    --border-color: #2d2d2d;
    --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.5);
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-body);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s;
}

/* Navbar */
.navbar {
    background-color: var(--primary-dark) !important;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: -0.5px;
    color: #fff !important;
}

.nav-link {
    color: rgba(255,255,255,0.8) !important;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-blue) !important;
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
    border-radius: 12px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.post-card {
    height: 100%;
    margin-bottom: 20px;
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

.post-img {
    height: 220px;
    object-fit: cover;
    border-radius: 12px 12px 0 0;
}

.card-body {
    padding: 1.5rem;
}

.card-title a {
    color: var(--text-main);
    text-decoration: none;
    font-weight: 700;
    transition: color 0.2s;
}

.card-title a:hover {
    color: var(--primary-blue);
}

.card-text {
    color: var(--text-muted);
}

/* Buttons & Links */
.btn-primary {
    background-color: var(--primary-blue);
    border-color: var(--primary-blue);
    font-weight: 600;
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
}

.btn-primary:hover {
    background-color: #1565C0;
    border-color: #1565C0;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Footer */
.footer {
    background-color: var(--primary-dark);
    color: #adb5bd;
    padding: 60px 0 30px;
    margin-top: 50px;
}

.footer h5 {
    color: #fff;
    margin-bottom: 20px;
    font-weight: 700;
}

.footer a {
    color: #adb5bd;
}

.footer a:hover {
    color: #fff;
}

/* Dark Mode Toggle */
.theme-toggle {
    cursor: pointer;
    background: transparent;
    border: none;
    color: rgba(255,255,255,0.8);
    font-size: 1.2rem;
    padding: 5px 10px;
    transition: color 0.2s;
}

.theme-toggle:hover {
    color: var(--accent-orange);
}

/* Article Detail */
.article-header {
    background: linear-gradient(to right, var(--primary-dark), #1a3c5e);
    color: white;
    padding: 60px 0;
    margin-bottom: 30px;
    border-radius: 0 0 20px 20px;
}

.article-content {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-main);
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-main);
    font-weight: 700;
}