:root {
        --bg-main: #0a0f1d;
        --card-bg: rgba(19, 27, 46, 0.85);
        --card-border: rgba(36, 48, 73, 0.8);
        --primary-blue: #2563eb;
        --primary-blue-hover: #1d4ed8;
        --accent-cyan: #06b6d4;
        --accent-green: #10b981;
        --text-white: #ffffff;
        --text-sub: #94a3b8;
        --text-muted: #64748b;
    }

    html, body {
        height: 100%;
        margin: 0;
        font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
        background-color: var(--bg-main);
        color: var(--text-white);
        overflow-x: hidden;
    }

    /* Arka Plan */
    .bg-ambient {
        position: fixed;
        inset: 0;
        background-image: 
            radial-gradient(circle at 15% 20%, rgba(37, 99, 235, 0.25), transparent 45%),
            radial-gradient(circle at 85% 80%, rgba(6, 182, 212, 0.18), transparent 45%),
            url('/images/login-bg.png');
        background-size: cover;
        background-position: center;
        opacity: 0.35;
        z-index: 0;
        pointer-events: none;
    }

    .main-wrapper {
        position: relative;
        z-index: 1;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
    }

    /* Header */
    .portal-nav {
        background: rgba(13, 21, 39, 0.9);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--card-border);
        padding: 1rem 2.5rem;
        box-shadow: 0 4px 25px rgba(0, 0, 0, 0.4);
    }

    .brand-logo-img {
        height: 48px;
        max-width: 170px;
        object-fit: contain;
        user-select: none;
        -webkit-user-drag: none;
        pointer-events: none;
    }

    .brand-title {
        font-size: 1.4rem;
        font-weight: 800;
        color: var(--text-white);
        letter-spacing: -0.02em;
    }

    /* Tab Menü Butonları */
    .portal-tabs {
        gap: 8px;
    }

    .portal-tabs .nav-link {
        color: var(--text-sub) !important;
        font-size: 0.9rem;
        font-weight: 600;
        padding: 0.65rem 1.25rem;
        border-radius: 10px;
        transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        border: 1px solid var(--card-border);
        background: rgba(23, 33, 54, 0.6);
        backdrop-filter: blur(4px);
    }

    .portal-tabs .nav-link:hover {
        color: #ffffff !important;
        background: rgba(30, 45, 74, 0.8);
        border-color: rgba(59, 130, 246, 0.5);
        transform: translateY(-1px);
    }

    .portal-tabs .nav-link.active {
        color: #ffffff !important;
        background: var(--primary-blue) !important;
        border-color: var(--primary-blue) !important;
        box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
    }

    /* Arşiv Butonu ÖZEL STİLİ (Header İçin) */
    .archive-btn-header {
        color: var(--accent-cyan) !important;
        background: rgba(6, 182, 212, 0.1) !important;
        border: 1px solid rgba(6, 182, 212, 0.3) !important;
        font-size: 0.9rem;
        font-weight: 600;
        padding: 0.65rem 1.25rem;
        border-radius: 10px;
        transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        text-decoration: none;
        display: inline-flex;
        align-items: center;
    }

    .archive-btn-header:hover {
        background: rgba(6, 182, 212, 0.2) !important;
        color: #ffffff !important;
        border-color: var(--accent-cyan) !important;
        box-shadow: 0 4px 15px rgba(6, 182, 212, 0.3);
        transform: translateY(-1px);
    }

    /* Tab Kartları */
    .tab-content-container {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 2.5rem 1.5rem;
    }

    .portal-card {
        background: var(--card-bg);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border: 1px solid var(--card-border);
        border-radius: 20px;
        padding: 2.5rem;
        box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
        width: 100%;
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }

    /* Logo Engelleme Kuralları */
    .logo-container, .logo-container img {
        user-select: none;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        pointer-events: none;
        cursor: default;
    }

    /* Form Elemanları */
    .glass-input, .glass-select {
        color: #ffffff !important;
        background-color: rgba(11, 17, 32, 0.7) !important;
        border: 1px solid var(--card-border) !important;
        height: 48px;
        border-radius: 10px;
        font-size: 0.925rem;
        font-weight: 500;
        transition: all 0.2s ease;
    }

    .glass-input::placeholder {
        color: var(--text-muted) !important;
    }

    .glass-select option {
        background-color: #0b1120 !important;
        color: #ffffff !important;
    }

    .glass-input:focus, .glass-select:focus {
        border-color: var(--primary-blue) !important;
        box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25) !important;
        background-color: rgba(11, 17, 32, 0.9) !important;
        outline: none;
    }

    /* Stat & Bilgi Kartları */
    .stat-card {
        background: rgba(11, 17, 32, 0.6);
        border: 1px solid var(--card-border);
        padding: 18px;
        border-radius: 12px;
        margin-bottom: 14px;
    }

    .progress-bar-custom {
        height: 8px;
        background: rgba(36, 48, 73, 0.6);
        border-radius: 10px;
        overflow: hidden;
        margin: 10px 0;
        position: relative;
    }

    .bar-fill-stock { position: absolute; height: 100%; background: #64748b; }
    .bar-fill-stage { position: absolute; height: 100%; background: var(--accent-green); }

    .tech-table { font-size: 0.875rem; width: 100%; color: #ffffff; }
    .tech-table td { padding: 12px 0; border-bottom: 1px solid var(--card-border); }

    .search-tab-link {
        color: var(--text-sub); 
        font-size: 0.875rem; 
        font-weight: 600;
        text-decoration: none; 
        padding: 8px 16px; 
        border-radius: 8px;
        transition: all 0.2s ease;
    }
    .search-tab-link:hover {
        color: #ffffff;
    }
    .search-tab-link.active {
        background: rgba(6, 182, 212, 0.15);
        color: var(--accent-cyan) !important;
    }

    /* Dil Butonları */
    .lang-pill-box { 
        display: inline-flex; 
        gap: 4px; 
        background: rgba(23, 33, 54, 0.8); 
        padding: 4px; 
        border-radius: 10px;
        border: 1px solid var(--card-border);
    }
    .lang-btn { 
        border: none; 
        background: transparent; 
        padding: 4px 12px; 
        border-radius: 6px; 
        font-size: 0.8rem; 
        font-weight: 700; 
        color: var(--text-sub); 
        transition: all 0.2s ease;
    }
    .lang-btn:hover {
        color: #ffffff;
    }
    .lang-btn.active { 
        background: var(--primary-blue); 
        color: #ffffff; 
    }

    @media (max-width: 991px) {
        .portal-nav { padding: 1rem 1.25rem; }
        .portal-tabs { flex-wrap: wrap; justify-content: center; width: 100%; margin: 12px 0; }
        .portal-card { padding: 1.75rem; }
    }