/* --- DEEP OS MASTER SYSTEM v3.0 (FINAL) --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Rajdhani:wght@600;700;800&display=swap');

:root {
    --primary: #0055FF;       /* Tech Blue */
    --primary-dark: #0033CC;
    --bg-body: #F3F4F6;       /* Açık Gri Zemin */
    --bg-card: #FFFFFF;       /* Beyaz Kartlar */
    --text-main: #111827;     /* Koyu Yazı */
    --text-sub: #6B7280;      /* Gri Yazı */
    --border: #E5E7EB;        /* İnce Çizgiler */
    --radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

/* --- RESET --- */
* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; outline: none; }
html { scroll-behavior: smooth; }
body { 
    font-family: 'Inter', sans-serif; background: var(--bg-body); color: var(--text-main); 
    line-height: 1.6; padding-top: 70px; padding-bottom: 100px; 
}
a { text-decoration: none; color: inherit; transition: 0.2s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
.container { max-width: 1250px; margin: 0 auto; padding: 0 20px; }

/* --- HEADER --- */
.app-header {
    position: fixed; top: 0; left: 0; width: 100%; height: 70px;
    background: rgba(255, 255, 255, 0.95); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border); z-index: 1000;
    display: flex; align-items: center; box-shadow: var(--shadow);
}
.header-content { display: flex; justify-content: space-between; align-items: center; width: 100%; }
.logo { font-family: 'Rajdhani', sans-serif; font-size: 1.8rem; font-weight: 800; color: #000; letter-spacing: -0.5px; }
.logo span { color: var(--primary); }

.desktop-nav { display: flex; gap: 25px; }
.d-link { font-size: 0.9rem; font-weight: 600; color: var(--text-sub); text-transform: uppercase; }
.d-link:hover, .d-link.active { color: var(--primary); }

.header-btn {
    background: var(--primary); color: #fff; padding: 10px 24px; border-radius: 6px;
    font-weight: 600; font-size: 0.9rem; display: flex; align-items: center; gap: 8px;
}

/* --- HERO --- */
.hero {
    position: relative; padding: 60px 20px; text-align: center;
    background: linear-gradient(135deg, #111827 0%, #000000 100%);
    border-radius: 0 0 30px 30px; margin-bottom: 40px; color: #fff;
}
.hero-title { font-family: 'Rajdhani', sans-serif; font-size: 2.5rem; font-weight: 800; line-height: 1.1; margin: 15px 0; }
.hero-title span { color: var(--primary); } 
.badge { background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.2); padding: 5px 15px; border-radius: 20px; font-size: 0.8rem; font-weight: 700; }

/* --- LAYOUT & SIDEBAR --- */
.layout-grid { display: grid; grid-template-columns: 260px 1fr; gap: 30px; align-items: start; }
.sidebar { position: sticky; top: 90px; }

.filter-box { 
    background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); 
    padding: 20px; margin-bottom: 20px; box-shadow: var(--shadow);
}
.filter-head { color: var(--text-main); font-weight: 700; margin-bottom: 15px; display: flex; align-items: center; gap: 8px; }

.custom-check { color: var(--text-sub); display: flex; justify-content: space-between; margin-bottom: 10px; cursor: pointer; align-items: center; }
.custom-check:hover { color: var(--primary); }
.check-mark { border: 2px solid var(--border); width: 18px; height: 18px; border-radius: 4px; display: inline-block; position: relative; }

/* Checkbox Logic */
.filter-checkbox { display: none; }
.filter-checkbox:checked + .check-mark { background: var(--primary); border-color: var(--primary); }
.filter-checkbox:checked + .check-mark::after { content: '✔'; position: absolute; top:-2px; left:3px; color: #fff; font-size: 12px; }

/* --- PRODUCT LIST --- */
.tech-list-group { margin-bottom: 40px; }
.brand-intro-container {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius) var(--radius) 0 0; padding: 25px;
    text-align: center; border-bottom: none;
}
.brand-desc h2 { color: var(--text-main); font-family: 'Rajdhani', sans-serif; font-size: 2rem; margin-bottom: 5px; }
.brand-desc p { color: var(--text-sub); font-size: 0.9rem; }
.badge-sig { background: #EEF2FF; color: var(--primary); border: 1px solid #DBEAFE; padding: 4px 10px; border-radius: 4px; font-size: 0.75rem; margin: 0 3px; font-weight: 600; }

.data-head {
    background: #E5E7EB; color: var(--text-sub); font-weight: 700; font-size: 0.8rem;
    display: grid; grid-template-columns: 2fr 3fr 1fr 140px; gap: 20px; padding: 15px 25px;
}

.data-row {
    display: grid; grid-template-columns: 2fr 3fr 1fr 140px; gap: 20px; padding: 20px 25px;
    background: var(--bg-card); border: 1px solid var(--border); border-top: none;
    align-items: center; transition: 0.2s;
}
.data-row:last-child { border-radius: 0 0 var(--radius) var(--radius); }
.data-row:hover { background: #F9FAFB; box-shadow: var(--shadow); z-index: 10; position: relative; }

.model-name strong { color: var(--text-main); font-size: 1.05rem; display: block; }
.model-code { color: var(--text-sub); font-size: 0.75rem; font-weight: 500; background: #f3f4f6; padding: 2px 6px; border-radius: 4px; }
.tech-spec { color: var(--text-sub); font-size: 0.85rem; }
.price-tag { color: var(--text-main); font-weight: 800; font-size: 1.1rem; text-align: right; white-space: nowrap; }

.action-btn {
    background: #fff; border: 2px solid var(--text-main); color: var(--text-main);
    padding: 8px 0; border-radius: 6px; font-weight: 700; font-size: 0.8rem;
    display: block; text-align: center;
}
.action-btn:hover { background: var(--text-main); color: #fff; }

/* --- SEO & FAQ --- */
.seo-cat-row { 
    background: #F3F4F6; padding: 15px 25px; border-left: 4px solid var(--primary);
    border-right: 1px solid var(--border); 
}
.seo-cat-title { color: var(--text-main); font-weight: 700; text-transform: uppercase; }
.seo-cat-desc { color: var(--text-sub); font-size: 0.85rem; margin-top: 5px; }

.seo-wrapper { background: var(--bg-card); padding: 40px; border-radius: var(--radius); border: 1px solid var(--border); margin-top: 40px; }
.faq-item { background: #F9FAFB; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 10px; }
.faq-question { padding: 15px; cursor: pointer; font-weight: 600; display: flex; justify-content: space-between; }
.faq-answer { padding: 0 15px 15px; display: none; color: var(--text-sub); }
.faq-item.active .faq-answer { display: block; }

/* --- FOOTER --- */
footer { background: #fff; border-top: 1px solid var(--border); margin-top: 60px; padding: 60px 0; text-align: center; color: var(--text-sub); }
.footer-links a { color: var(--text-main); font-weight: 600; margin: 0 10px; }

/* --- MOBILE SPECIFIC --- */
.mobile-filter-btn { display: none; }
.mobile-filter-close { display: none; }
.bottom-nav {
    position: fixed; bottom: 0; left: 0; width: 100%; height: 75px;
    background: #FFFFFF; border-top: 1px solid var(--border);
    display: flex; justify-content: space-around; align-items: center;
    z-index: 2000; padding-bottom: env(safe-area-inset-bottom); display: none;
}
.bn-item { display: flex; flex-direction: column; align-items: center; color: var(--text-sub); font-size: 0.7rem; }
.bn-item.active { color: var(--primary); }
.bn-icon { font-size: 1.5rem; margin-bottom: 4px; }

@media (max-width: 991px) {
    .layout-grid { grid-template-columns: 1fr; }
    .desktop-nav, .header-btn { display: none; }
    .bottom-nav { display: flex; }
    .data-head { display: none !important; }
    .data-row { grid-template-columns: 1fr; text-align: center; gap: 15px; }
    .price-tag { text-align: center; margin: 5px 0; font-size: 1.4rem; color: var(--primary); }
    .action-btn { width: 100%; padding: 12px; }
    
    .mobile-filter-btn {
        display: flex; align-items: center; justify-content: center; gap: 10px;
        background: #fff; color: var(--text-main); border: 1px solid var(--border);
        padding: 12px; border-radius: 8px; font-weight: 700; margin-bottom: 20px;
        cursor: pointer; box-shadow: var(--shadow);
    }
    .sidebar {
        display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100vh;
        background: #F3F4F6; z-index: 3000; padding: 20px; overflow-y: auto;
    }
    .sidebar.active { display: block; }
    .mobile-filter-close {
        display: block; width: 100%; padding: 15px; 
        background: var(--text-main); color: #fff; border: none; 
        border-radius: 8px; font-weight: 700; margin-bottom: 20px; text-align: center; cursor: pointer;
    }
}