/* ================================================================
   PLANSAL — KURUMSALOGRENCI SAYFASI STİLLERİ
   ================================================================ */

/* ===== Orijinal satır 12-430 ===== */
        /* ============================================================
           TEMA SİSTEMİ — /ders ile birebir aynı değişkenler.
           ============================================================ */
        :root {
            --color-primary:          #4f46e5;
            --color-primary-hover:    #4338ca;
            --color-primary-light:    #e0e7ff;
            --color-primary-lighter:  #eef2ff;
            --color-primary-border:   #c7d2fe;
            --color-primary-shadow:   rgba(79, 70, 229, 0.2);
            --color-primary-shadow-md: rgba(79, 70, 229, 0.3);

            --color-success:          #28a745;
            --color-success-hover:    #218838;
            --color-success-light:    #d4edda;
            --color-success-border:   #c3e6cb;
            --color-success-shadow:   rgba(40, 167, 69, 0.3);

            --color-danger:           #d9534f;
            --color-danger-hover:     #c9302c;
            --color-danger-light:     #ffeaea;
            --color-danger-border:    #ffc2c2;

            --color-warning:          #ffc107;

            --color-bg-page:          #f3f4f6;
            --color-bg-card:          #ffffff;
            --color-bg-input:         #f8f9fa;
            --color-bg-hover:         #e0e7ff;

            --color-text-main:        #333333;
            --color-text-secondary:   #555555;
            --color-text-muted:       #888888;
            --color-text-light:       #aaaaaa;
            --color-text-placeholder: #95a5a6;

            --color-border:           #eef2f5;
            --color-border-medium:    #dce4ec;
            --color-border-strong:    #bdc3c7;

            --shadow-xs:    0 2px 4px rgba(0,0,0,0.04);
            --shadow-sm:    0 2px 4px rgba(0,0,0,0.1);
            --shadow-md:    0 4px 10px rgba(0,0,0,0.1);
            --shadow-card:  0 8px 20px rgba(0,0,0,0.06);
            --shadow-modal: 0 10px 30px rgba(0,0,0,0.2);
            --shadow-primary: 0 4px 10px var(--color-primary-shadow);

            --radius-xs:  4px;
            --radius-sm:  6px;
            --radius-md:  8px;
            --radius-lg:  12px;
            --radius-xl:  20px;
            --radius-full: 50%;

            --transition-fast: all 0.2s ease;
            --transition-base: all 0.3s ease;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: var(--color-bg-page); 
            color: var(--color-text-main);
            height: 100vh;
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        /* --- ÜST MENÜ (YÜZEN HEADER) --- */
        .header {
            display: flex;
            justify-content: space-between; 
            align-items: center;
            background-color: var(--color-bg-card);
            padding: 14px 25px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.12), 0 4px 10px rgba(0,0,0,0.06); 
            margin: 20px auto 15px auto; 
            width: calc(100% - 40px);
            max-width: 1400px; 
            border-radius: var(--radius-lg); 
            position: sticky;
            top: 20px; 
            z-index: 100; 
            flex-shrink: 0;
        }

        .logo-container {
            display: flex;
            align-items: center;
            gap: 10px;
            cursor: pointer; 
            transition: transform 0.2s ease;
        }
        .logo-container:hover { transform: scale(1.02); }

        .logo-icon {
            width: 28px;
            height: 28px;
            background-color: var(--color-primary);
            color: white;
            border-radius: var(--radius-full);
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 13px;
            box-shadow: var(--shadow-primary);
        }

        .logo-text {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-text-main);
            letter-spacing: 0.5px;
        }

        .header-center-title {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            font-size: 22px;
            font-weight: 900;
            color: var(--color-text-main);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .btn-outline {
            background-color: transparent;
            color: var(--color-primary);
            border: 2px solid var(--color-primary);
            padding: 8px 16px;
            border-radius: var(--radius-md);
            font-size: 13px;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition-base);
        }
        .btn-outline:hover {
            background-color: var(--color-primary);
            color: #ffffff;
        }

        .btn-primary {
            background-color: var(--color-primary);
            color: #ffffff;
            border: none;
            padding: 8px 16px;
            border-radius: var(--radius-md);
            font-size: 13px;
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition-base);
            box-shadow: var(--shadow-primary);
        }
        .btn-primary:hover {
            background-color: var(--color-primary-hover);
            transform: translateY(-2px);
        }

        .menu-btn {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 24px;
            color: var(--color-text-secondary);
            background: none;
            border: none;
            cursor: pointer;
            transition: color 0.2s ease, transform 0.2s ease;
            padding: 5px 10px;
        }
        .menu-text { font-size: 16px; font-weight: 700; }
        .menu-btn:hover { color: var(--color-primary); transform: scale(1.05); }

        /* --- TEK BÜYÜK İÇERİK ALANI --- */
        .template-content {
            width: calc(100% - 40px);
            max-width: 1400px;
            margin: 10px auto 20px auto;
            flex: 1;
            min-height: 0;
            background-color: var(--color-bg-card);
            border-radius: var(--radius-xl);
            box-shadow: 0 15px 40px rgba(0,0,0,0.18), 0 5px 15px rgba(0,0,0,0.08);
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }

        .template-inner {
            flex: 1;
            min-height: 0;
            padding: 30px;
            overflow-y: auto;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
        }

        .template-inner::-webkit-scrollbar { width: 6px; }
        .template-inner::-webkit-scrollbar-thumb { background: var(--color-primary-border); border-radius: 6px; }
        .template-inner::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

        .template-placeholder-icon {
            font-size: 64px;
            color: var(--color-primary-border);
            margin-bottom: 20px;
        }

        .template-placeholder-title {
            font-size: 22px;
            font-weight: 800;
            color: var(--color-text-main);
            margin-bottom: 10px;
        }

        .template-placeholder-desc {
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text-muted);
            text-align: center;
            max-width: 500px;
            line-height: 1.6;
        }

        /* --- REKLAM ALANLARI --- */
        .ad-space-left, .ad-space-right {
            position: fixed;
            top: 50%;
            transform: translateY(-50%);
            width: 10vw;
            height: 600px;
            max-height: 80vh;
            background-color: #f8f9fa;
            border: 2px dashed #ced4da;
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            z-index: 50;
            color: #adb5bd;
            font-weight: 800;
            font-size: 16px;
            text-align: center;
            box-shadow: inset 0 0 10px rgba(0,0,0,0.02);
        }
        .ad-space-left { left: 20px; }
        .ad-space-right { right: 20px; }
        @media (max-width: 900px) {
            .ad-space-left, .ad-space-right { display: none !important; }
        }

        /* --- YAN MENÜ (SIDEBAR) --- */
        .menu-overlay {
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background-color: rgba(0,0,0,0.4);
            backdrop-filter: blur(3px);
            z-index: 4000;
            opacity: 0;
            visibility: hidden;
            transition: var(--transition-base);
        }
        .menu-overlay.show { opacity: 1; visibility: visible; }
        
        .side-menu {
            position: fixed;
            top: 0;
            right: -320px;
            width: 300px;
            height: 100vh;
            background-color: var(--color-bg-card);
            box-shadow: -5px 0 25px rgba(0,0,0,0.1);
            z-index: 4001;
            transition: right 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
            display: flex;
            flex-direction: column;
        }
        .side-menu.open { right: 0; }
        
        .side-menu-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 25px;
            border-bottom: 1px solid #eef2f5;
            background-color: #f0f4ff;
        }
        .side-menu-header h2 {
            font-size: 18px;
            font-weight: 800;
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .close-menu-btn {
            background: var(--color-bg-input);
            border: none;
            font-family: Arial, sans-serif;
            font-weight: 300;
            font-size: 26px;
            color: var(--color-text-light);
            cursor: pointer;
            transition: all 0.2s;
            line-height: 1;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 1px 0 0 0;
        }
        .close-menu-btn:hover { background: var(--color-danger-light); color: var(--color-danger); }
        
        .side-menu-content {
            padding: 20px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            overflow-y: auto;
        }
        
        .menu-item {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 12px 15px;
            color: var(--color-text-secondary);
            text-decoration: none;
            font-size: 14px;
            font-weight: 700;
            border-radius: 10px;
            transition: var(--transition-fast);
            background-color: #fcfcfc;
            border: 1px solid transparent;
        }
        .menu-item:hover {
            background-color: var(--color-primary-lighter);
            color: var(--color-primary);
            border-color: var(--color-primary-border);
            transform: translateX(5px);
        }
        .menu-item i {
            font-size: 16px;
            color: var(--color-primary);
            width: 20px;
            text-align: center;
        }
        .menu-item.active-page {
            background-color: var(--color-primary-lighter);
            color: var(--color-primary);
            border-color: var(--color-primary-border);
        }

        /* --- AÇILIŞ YÜKLEME EKRANI --- */
        .page-loader {
            position: fixed;
            top: 0; left: 0; width: 100%; height: 100%;
            background: linear-gradient(135deg, #f3f4f6 0%, #e0e7ff 100%);
            z-index: 9999;
            display: flex;
            justify-content: center;
            align-items: center;
            transition: opacity 0.5s ease, visibility 0.5s ease;
        }
        .page-loader.hidden { opacity: 0; visibility: hidden; }

        .loader-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 15px;
            animation: floatLoader 2s infinite ease-in-out;
        }
        .loader-logo { width: 70px; height: 70px; font-size: 30px; box-shadow: 0 8px 25px rgba(79, 70, 229, 0.3); }
        .loader-title { font-size: 26px; font-weight: 800; color: var(--color-text-main); letter-spacing: 1px; margin-top: 5px; }
        .loader-text { font-size: 13px; font-weight: 600; color: #777; margin-top: 5px; letter-spacing: 0.5px; }
        .spinner {
            width: 40px; height: 40px;
            border: 4px solid #c7d2fe;
            border-top: 4px solid var(--color-primary);
            border-radius: var(--radius-full);
            animation: spin 1s linear infinite;
            margin-top: 5px;
        }

        @keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
        @keyframes floatLoader {
            0% { transform: translateY(0px); }
            50% { transform: translateY(-10px); }
            100% { transform: translateY(0px); }
        }

        /* --- ANA SAYFAYA GEÇİŞ YÜKLEME EKRANI --- */
        .transition-loader {
            position: fixed;
            top: 0; left: 0; width: 100%; height: 100%;
            background: linear-gradient(135deg, #f3f4f6 0%, #e0e7ff 100%);
            display: none; 
            flex-direction: column;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .transition-loader.active { display: flex; opacity: 1; }