/* --- TEMEL AYARLAR --- */
:root {
    --primary: #0a192f;      /* Koyu Lacivert */
    --secondary: #112240;    /* Açık Lacivert */
    --accent: #FFC107;       /* Altın Sarısı */
    --logo-blue: #002855;    /* Logo Mavisi */
    --text-light: #ccd6f6;   /* Açık Yazı */
    --text-dim: #8892b0;     /* Sönük Yazı */
    --white: #ffffff;
    --success: #27c93f;      
    --error: #ff5f56;        
    --card-bg: rgba(17, 34, 64, 0.95);
    --header-bg: rgba(10, 25, 47, 0.98);
    --border-line: rgba(255, 193, 7, 0.1);
    --input-bg: #0a192f;
    --input-border: #333;
    --sim-bg: #0a192f;
}

[data-theme="light"] {
    --primary: #f0f4f8;
    --secondary: #ffffff;
    --text-light: #0a192f;
    --text-dim: #4a5568;
    --header-bg: rgba(255, 255, 255, 0.95);
    --border-line: rgba(0, 40, 85, 0.1);
    --input-bg: #f9fafb;
    --input-border: #ddd;
    --sim-bg: #ffffff;
    --card-bg: #ffffff;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; overflow-x: hidden; width: 100%; height: 100%; overscroll-behavior-y: none; }
body { font-family: 'Outfit', sans-serif; color: var(--text-light); background-color: var(--primary); line-height: 1.6; overflow-x: hidden; width: 100%; min-height: 100%; position: relative; transition: background-color 0.3s, color 0.3s; }
a { text-decoration: none; transition: 0.3s; color: inherit; } 
ul { list-style: none; }

/* --- HEADER --- */
header { background-color: var(--header-bg); backdrop-filter: blur(10px); position: fixed; width: 100%; top: 0; z-index: 1000; border-bottom: 1px solid var(--border-line); height: 90px; display: flex; align-items: center; transition: background-color 0.3s; }
.container { width: 100%; padding: 0 25px; margin: 0 auto; max-width: 1400px; }
nav { display: flex; justify-content: space-between; align-items: center; }

.custom-logo-container { background-color: white; padding: 5px 15px; border-radius: 12px; border: 2px solid var(--logo-blue); display: flex; align-items: center; gap: 10px; height: 60px; box-shadow: 0 0 15px rgba(255, 255, 255, 0.1); cursor: pointer; z-index: 1002; }
.logo-left { display: flex; flex-direction: column; justify-content: center; }
.logo-text { font-family: 'Outfit', sans-serif; font-weight: 800; font-size: 1.6rem; line-height: 1; letter-spacing: -1px; }
.text-on { color: var(--accent); } .text-math { color: var(--logo-blue); }
.logo-line { height: 3px; background-color: var(--accent); width: 100%; margin-top: 2px; border-radius: 2px; }
.logo-right { display: flex; flex-direction: column; align-items: center; justify-content: center; padding-left: 5px; }
.camera-icon-wrapper { position: relative; display: flex; align-items: center; justify-content: center; color: var(--logo-blue); font-size: 1.3rem; margin-bottom: 4px; }
.camera-user { position: absolute; font-size: 0.6rem; color: var(--accent); top: 50%; left: 45%; transform: translate(-50%, -50%); }
.text-line { color: var(--accent); font-weight: 800; font-size: 0.8rem; line-height: 1; }

.nav-right { display: flex; align-items: center; gap: 20px; }
.nav-links { display: flex; gap: 25px; align-items: center; }
.nav-links a { color: var(--text-light); font-size: 0.95rem; position: relative; font-weight: 600; }
.nav-links a:hover { color: var(--accent); }

.auth-buttons { display: flex; gap: 10px; }
.btn-login { background-color: transparent; border: 1px solid var(--accent); color: var(--accent); padding: 8px 18px; border-radius: 6px; cursor: pointer; font-weight: 600; transition: 0.3s; white-space: nowrap; }
.btn-login:hover { background: rgba(255, 193, 7, 0.1); color: var(--text-light); }
.btn-register { background-color: var(--accent); border: 1px solid var(--accent); color: var(--logo-blue); padding: 8px 18px; border-radius: 6px; cursor: pointer; font-weight: 800; transition: 0.3s; white-space: nowrap; }
.btn-register:hover { background-color: #ffdb73; }

.lang-wrapper { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 0.9rem; color: var(--text-dim); border: 1px solid var(--border-line); padding: 5px 12px; border-radius: 20px; transition: 0.3s; height: 40px; cursor: pointer; }
.lang-wrapper:hover { border-color: var(--accent); }
.lang-opt { transition: 0.3s; }
.lang-opt:hover { color: var(--text-light); }
.lang-opt.active { color: var(--accent); }
.lang-sep { opacity: 0.3; }

.theme-toggle-btn { position: fixed; bottom: 30px; right: 30px; z-index: 2001; background: var(--secondary); border: 2px solid var(--accent); cursor: pointer; font-size: 1.5rem; color: var(--accent); transition: 0.3s; display: flex; align-items: center; justify-content: center; width: 50px; height: 50px; border-radius: 50%; box-shadow: 0 5px 15px rgba(0,0,0,0.3); }
.theme-toggle-btn:hover { transform: scale(1.1); background: var(--accent); color: var(--logo-blue); }

.logged-in-menu { display: none; align-items: center; gap: 15px; }
.btn-panel { background-color: var(--accent); color: var(--logo-blue); padding: 8px 15px; border-radius: 6px; font-weight: bold; font-size: 0.9rem; cursor: pointer; border: none; display: flex; align-items: center; gap: 8px; }
.user-avatar { width: 35px; height: 35px; background: var(--secondary); color: var(--accent); border: 1px solid var(--accent); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; font-size: 1rem; }
.btn-logout-nav { font-size: 1.2rem; color: #ff5f56; cursor: pointer; background: none; border: none; padding: 5px; }
.hamburger { display: none; cursor: pointer; z-index: 2000; margin-left: 0; }
.bar { display: block; width: 25px; height: 3px; margin: 5px auto; transition: all 0.3s ease-in-out; background-color: var(--accent); }
.hamburger.active .bar:nth-child(2) { opacity: 0; }
.hamburger.active .bar:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.active .bar:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

#publicContent { display: block; padding-top: 100px; }
#secureContent { display: none; padding-top: 90px; min-height: 100vh; background-color: var(--primary); }

/* --- HERO BÖLÜMÜ --- */
.hero { min-height: calc(100vh - 100px); display: flex; align-items: center; background: radial-gradient(circle at 50% 50%, var(--secondary) 0%, var(--primary) 100%); position: relative; overflow: hidden; }
#heroCanvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0.4; pointer-events: none; }
.hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; position: relative; z-index: 2; }
.hero-content h1 { font-size: 3.5rem; line-height: 1.1; font-weight: 800; color: var(--text-light); margin-bottom: 25px; }
.hero-content h1 span { color: var(--accent); display: block; font-size: 2.5rem; margin-top: 10px; }
.hero-content p { font-size: 1.1rem; color: var(--text-dim); max-width: 600px; margin-bottom: 40px; }
.btn-main { background-color: var(--accent); color: var(--logo-blue); padding: 18px 40px; border-radius: 4px; font-weight: 800; font-size: 1rem; display: inline-flex; align-items: center; gap: 10px; }

/* ZOOM PENCERESİ */
.zoom-window { background: #1a1a1a; border-radius: 12px; box-shadow: 0 20px 50px rgba(0,0,0,0.2); border: 1px solid #333; overflow: hidden; position: relative; aspect-ratio: 16/10; width: 100%; }
.zoom-header { background: #242424; padding: 10px 15px; display: flex; justify-content: space-between; align-items: center; border-bottom: 1px solid #333; }
.zoom-dots { display: flex; gap: 6px; } .dot { width: 10px; height: 10px; border-radius: 50%; } .red { background: #ff5f56; } .yellow { background: #ffbd2e; } .green { background: #27c93f; }
.recording-badge { display: flex; align-items: center; gap: 6px; color: #ff5f56; font-size: 0.8rem; font-weight: 600; } .rec-dot { width: 8px; height: 8px; background: #ff5f56; border-radius: 50%; animation: pulse 1.5s infinite; }
.zoom-content { position: relative; height: 100%; background: #fff; display: flex; justify-content: center; align-items: center; overflow: hidden; }
.whiteboard-text { font-family: 'Kalam', cursive; font-size: 2rem; color: #0a192f; position: absolute; left: 30px; top: 40px; }
.cursor { width: 20px; height: 20px; background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" fill="%23000" viewBox="0 0 24 24"><path d="M7 2l12 11.2-5.8.5 3.3 7.3-2.2.9-3.2-7.4-4.4 4V2z"/></svg>') no-repeat; position: absolute; animation: moveCursor 4s infinite alternate; z-index: 10; }
.teacher-cam { position: absolute; top: 20px; right: 20px; width: 120px; height: 90px; background: #333; border-radius: 6px; border: 2px solid var(--accent); overflow: hidden; box-shadow: 0 5px 15px rgba(0,0,0,0.3); z-index: 5; }
.teacher-cam img { width: 100%; height: 100%; object-fit: cover; }
.cam-name { position: absolute; bottom: 2px; left: 5px; color: white; font-size: 0.6rem; background: rgba(0,0,0,0.6); padding: 1px 4px; border-radius: 3px; }
.zoom-controls { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); background: rgba(26, 26, 26, 0.9); padding: 8px 20px; border-radius: 8px; display: flex; gap: 20px; z-index: 10; }
.zoom-btn { color: #fff; font-size: 1.2rem; display: flex; flex-direction: column; align-items: center; gap: 4px; } .zoom-btn span { font-size: 0.6rem; color: #aaa; } .zoom-btn:hover i { color: var(--accent); } .active-mic i { animation: shake 2s infinite; color: var(--accent); }

/* HAKKIMDA */
.about-section { padding: 100px 0; background-color: var(--secondary); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-img { position: relative; }
.about-img img { width: 100%; border-radius: 8px; position: relative; z-index: 1; box-shadow: 0 10px 30px rgba(0,0,0,0.2); object-fit: cover; }
.about-text h2 { font-size: 2.5rem; color: var(--text-light); margin-bottom: 20px; }
.about-text p { color: var(--text-dim); font-size: 1.1rem; margin-bottom: 30px; }
.feature-list { list-style: none; }
.feature-list li { display: flex; align-items: flex-start; margin-bottom: 15px; color: var(--text-light); }
.feature-list i { color: var(--accent); margin-right: 15px; margin-top: 5px; }

/* --- SİMÜLASYONLAR --- */
.sim-section { padding: 80px 0; background-color: var(--primary); }

.section-header { 
    margin-bottom: 40px; 
    display: flex; 
    flex-direction: column; 
    align-items: center; 
    justify-content: center;
    gap: 30px; 
    text-align: center; 
    width: 100%;
}

.section-header h2 { 
    font-size: 2.5rem; 
    color: var(--text-light); 
    white-space: nowrap; 
    font-weight: 800; 
    margin: 0;
}

/* LEVEL BUTONLARI */
.level-selector { 
    display: flex; 
    justify-content: center; 
    gap: 20px;
    width: 100%; 
}

.level-btn {
    background-color: transparent !important;
    background-image: none !important;
    border: 2px solid var(--accent) !important;
    color: var(--accent) !important;
    padding: 12px 40px !important;
    border-radius: 50px !important;
    font-family: 'Outfit', sans-serif !important;
    font-weight: 800 !important;
    font-size: 1.1rem !important;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-decoration: none;
    display: inline-block;
    appearance: none; 
    -webkit-appearance: none;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2) !important;
}

.level-btn:hover, .level-btn.active {
    background-color: var(--accent) !important;
    color: var(--logo-blue) !important;
    /* DAHA YUMUŞAK GÖLGE */
    box-shadow: 0 0 15px rgba(255, 193, 7, 0.35) !important; 
    transform: translateY(-3px);
}

.class-selector { display: flex; gap: 10px; flex-wrap: wrap; justify-content: center; width: 100%; margin-top: 20px; }
.class-btn { background: transparent; border: 1px solid var(--text-dim); color: var(--text-dim); padding: 8px 16px; border-radius: 15px; cursor: pointer; transition: 0.3s; font-weight: 600; flex: 1 1 auto; text-align: center; max-width: 150px; white-space: nowrap; opacity: 0.7; }
.class-btn:hover, .class-btn.active { background: var(--accent); color: var(--logo-blue); border-color: var(--accent); opacity: 1; }

.sim-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; margin-top: 30px; }
.sim-card { background: var(--secondary); border-radius: 12px; padding: 25px; box-shadow: 0 10px 30px rgba(0,0,0,0.1); border: 1px solid var(--border-line); transition: 0.3s; position: relative; }
.sim-icon { font-size: 2rem; color: var(--accent); margin-bottom: 15px; display: block; }
.sim-canvas-container { width: 100%; height: 300px; background: var(--sim-bg); border-radius: 8px; border: 1px solid var(--border-line); position: relative; overflow: hidden; margin-top: 15px; touch-action: none; }
.sim-controls { margin-top: 15px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; width: 100%; }
.sim-controls > div { flex: 1 1 100px; min-width: 80px; text-align: center; }
.sim-control-label { font-size: 0.8rem; color: var(--text-dim); display: block; margin-bottom: 5px; }
input[type=range] { width: 100%; accent-color: var(--accent); cursor: pointer; touch-action: none; }

.sim-analysis-box { margin-top: 15px; background: rgba(0,0,0,0.2); padding: 15px; border-radius: 8px; font-size: 0.9rem; border: 1px solid var(--border-line); }
.analysis-row { display: flex; justify-content: space-between; padding: 5px 0; border-bottom: 1px solid rgba(128,128,128,0.2); }
.analysis-row:last-child { border-bottom: none; }

.quiz-container { background: rgba(128,128,128,0.1); padding: 15px; border-radius: 8px; margin-top: 15px; border: 1px solid var(--border-line); }
.quiz-question { font-weight: bold; color: var(--text-light); margin-bottom: 15px; font-family: 'Fira Code', monospace; }
.quiz-options { display: grid; gap: 10px; }
.quiz-btn { background: var(--primary); border: 1px solid var(--border-line); color: var(--text-light); padding: 10px; border-radius: 5px; cursor: pointer; text-align: left; transition: 0.2s; }
.quiz-btn:hover { border-color: var(--accent); }
.quiz-feedback { margin-top: 15px; padding: 10px; border-radius: 5px; display: none; font-size: 0.9rem; }
.feedback-correct { background: rgba(39, 201, 63, 0.2); border: 1px solid var(--success); color: var(--success); }
.feedback-wrong { background: rgba(255, 95, 86, 0.2); border: 1px solid var(--error); color: var(--error); }

.library-section { padding: 80px 0; background-color: var(--secondary); border-top: 1px solid var(--border-line); }
.dashboard-container { display: flex; min-height: calc(100vh - 100px); }
.dash-sidebar { width: 250px; background-color: var(--secondary); border-right: 1px solid var(--border-line); padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.dash-main { flex: 1; padding: 30px; overflow-y: auto; }
.sidebar-link { display: flex; align-items: center; gap: 10px; padding: 12px 15px; color: var(--text-dim); border-radius: 8px; transition: 0.3s; cursor: pointer; border: 1px solid transparent; }
.sidebar-link:hover { background-color: rgba(255, 193, 7, 0.05); color: var(--text-light); }
.sidebar-link.active { background-color: rgba(255, 193, 7, 0.15); color: var(--accent); border-color: rgba(255, 193, 7, 0.3); font-weight: bold; }
.dash-card { background: var(--card-bg); border-radius: 12px; padding: 20px; border: 1px solid var(--border-line); display: flex; justify-content: space-between; align-items: center; }
.dash-card h3 { font-size: 2rem; color: var(--text-light); margin: 0; }
.dash-card p { color: var(--text-dim); font-size: 0.9rem; margin: 0; }
.dash-icon { width: 50px; height: 50px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.dash-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; margin-bottom: 30px; }
.table-responsive { overflow-x: auto; -webkit-overflow-scrolling: touch; margin-bottom: 20px; border-radius: 8px; border: 1px solid var(--border-line); }
.data-table { width: 100%; border-collapse: collapse; color: var(--text-light); min-width: 600px; }
.data-table th { text-align: left; padding: 15px; color: var(--text-dim); border-bottom: 1px solid var(--border-line); font-size: 0.8rem; text-transform: uppercase; white-space: nowrap; background: rgba(128,128,128,0.1); }
.data-table td { padding: 15px; border-bottom: 1px solid var(--border-line); }
.data-table tr:hover { background-color: rgba(128,128,128,0.05); }
.status-badge { padding: 5px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: bold; cursor: pointer; transition: 0.3s; display: inline-block; }
.status-badge:hover { opacity: 0.8; transform: scale(1.05); }
.badge-paid { background: rgba(39, 201, 63, 0.15); color: var(--success); border: 1px solid var(--success); }
.badge-pending { background: rgba(255, 193, 7, 0.15); color: var(--accent); border: 1px solid var(--accent); }
.action-btn { background: none; border: none; cursor: pointer; padding: 5px; transition: 0.3s; font-size: 1.1rem; }
.btn-trash:hover { color: var(--error); }
.btn-dash-action { background: var(--accent); color: var(--logo-blue); border: none; padding: 10px 15px; border-radius: 6px; font-weight: bold; cursor: pointer; transition: 0.3s; display: inline-flex; align-items: center; gap: 8px; font-size: 0.9rem; white-space: nowrap; }
.btn-dash-action:hover { background: #ffdb73; transform: translateY(-2px); }

/* --- MODALLAR İÇİN YENİ ANİMASYON KODLARI --- */
/* Açılış Efekti (Fade In) */
@keyframes fadeIn {
    from { opacity: 0; backdrop-filter: blur(0px); }
    to { opacity: 1; backdrop-filter: blur(5px); }
}

/* İçerik Kayma Efekti (Slide Up) */
@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Modal Kapsayıcısı */
.modal { 
    display: none; /* JS ile flex yapılacak */
    position: fixed; 
    z-index: 3000; 
    left: 0; 
    top: 0; 
    width: 100%; 
    height: 100%; 
    background-color: rgba(0,0,0,0.85); 
    backdrop-filter: blur(5px); 
    align-items: center; 
    justify-content: center; 
    padding: 20px; 
    
    /* Animasyon Eklendi */
    animation: fadeIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards; 
}

/* Modal İçeriği (Kutu) */
.modal-content { 
    background-color: var(--secondary); 
    padding: 30px; 
    border-radius: 15px; 
    border: 1px solid var(--accent); 
    text-align: center; 
    max-width: 400px; 
    width: 100%; 
    position: relative; 
    overflow-y: auto; 
    max-height: 90vh; 
    
    /* Animasyon Eklendi */
    animation: slideUp 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; /* Hafif yaylanma */
}

.close-modal { position: absolute; right: 20px; top: 15px; color: var(--text-light); font-size: 24px; cursor: pointer; }
.tab-buttons { display: flex; border-bottom: 1px solid var(--border-line); margin-bottom: 20px; }
.tab-btn { flex: 1; padding: 10px; background: none; border: none; color: var(--text-dim); cursor: pointer; border-bottom: 2px solid transparent; font-weight: bold; }
.tab-btn.active { color: var(--accent); border-bottom: 2px solid var(--accent); }
.auth-input { width: 100%; padding: 12px; margin: 10px 0; border-radius: 6px; border: 1px solid var(--input-border); background: var(--input-bg); color: var(--text-light); font-family: 'Outfit'; outline: none; }
.auth-input:focus { border-color: var(--accent); }
.auth-submit { width: 100%; padding: 12px; background: var(--accent); color: var(--logo-blue); font-weight: bold; border: none; border-radius: 6px; cursor: pointer; font-size: 1rem; margin-top: 10px; transition:0.3s; }
.auth-submit:disabled { background-color: #555; cursor: not-allowed; color:#aaa; }
.toggle-link { margin-top: 15px; font-size: 0.9rem; color: #aaa; cursor: pointer; text-decoration: underline; }
.status-msg { margin-top: 10px; font-size: 0.9rem; font-weight: bold; display: none; }
.calc-result { background: rgba(255, 193, 7, 0.1); padding: 15px; border-radius: 8px; margin-top: 15px; border: 1px solid var(--accent); }
.calc-value { font-size: 1.5rem; font-weight: 800; color: var(--accent); }

/* --- FOOTER DÜZENLEMESİ (GARANTİLİ ORTALAMA) --- */
footer {
    background-color: var(--primary);
    padding: 50px 0; 
    border-top: 1px solid var(--border-line);
    width: 100%;
    text-align: center;
}
footer .container {
    display: flex;
    flex-direction: column; 
    align-items: center;    
    justify-content: center;
    gap: 15px; 
}
footer p {
    color: var(--text-dim);
    font-size: 0.95rem;
    margin: 0;
    line-height: 1.5;
}
footer i { color: var(--accent); margin-right: 5px; }
footer a { color: var(--accent); font-weight: 600; text-decoration: none; transition: color 0.3s ease; }
footer a:hover { color: var(--text-light); text-decoration: underline; }

@media (max-width: 900px) {
    .hamburger { display: block; }
    .nav-links { position: fixed; left: -100%; top: 90px; gap: 0; flex-direction: column; background-color: var(--header-bg); width: 100%; height: calc(100vh - 90px); text-align: center; transition: 0.3s; padding: 40px 20px; overflow-y: auto; border-top: 1px solid var(--border-line); }
    .nav-links.active { left: 0; }
    .nav-links li { width: 100%; margin-bottom: 15px; }
    .nav-links a { font-size: 1.2rem; display: block; padding: 10px; }
    .auth-buttons { flex-direction: column; width: 100%; gap: 15px; margin-top: 20px; }
    .btn-login, .btn-register { width: 100%; padding: 15px; font-size: 1rem; }
    .logged-in-menu { width: 100%; flex-direction: column; gap: 20px; margin-top: 20px; }
    .btn-panel { width: 100%; padding: 15px; font-size: 1.1rem; justify-content: center; }
    .btn-logout-nav { margin-top: 20px; font-size: 1.5rem; }
    .hero { padding-top: 130px; text-align: center; }
    .hero-grid { grid-template-columns: 1fr; gap: 40px; }
    .hero-content h1 { font-size: 2.5rem; }
    .zoom-window { max-width: 100%; }
    .about-grid { grid-template-columns: 1fr; text-align: center; }
    .section-header { flex-direction: column; text-align: center; gap: 15px; }
    .section-header h2 { font-size: 1.8rem; }
    .class-selector { width: 100%; justify-content: center; gap: 5px; }
    .class-btn { padding: 8px 12px; font-size: 0.8rem; flex: 1 1 calc(50% - 10px); max-width: none; }
    .dashboard-container { flex-direction: column; }
    .dash-sidebar { width: 100%; flex-direction: row; overflow-x: auto; padding: 10px; border-bottom: 1px solid var(--border-line); border-right: none; position: sticky; top: 90px; z-index: 900; background: var(--primary); justify-content: flex-start; }
    .sidebar-link { white-space: nowrap; font-size: 0.9rem; padding: 10px 15px; flex: 0 0 auto; }
    .dash-main { padding: 20px 15px; }
    .student-grid { grid-template-columns: 1fr; }
    .material-card { width: 100%; box-sizing: border-box; }
    .sim-grid { grid-template-columns: 1fr; gap: 20px; }
    .sim-card { width: 100%; box-sizing: border-box; padding: 15px; }
    .sim-canvas-container { height: 250px; }
    .theme-toggle-btn { bottom: 20px; right: 20px; width: 45px; height: 45px; }
    .right-controls { gap: 15px; }
    .lang-wrapper { font-size: 0.85rem; padding: 4px 10px; height: 35px; }
    
    /* MOBİLDE BUTONLARI DÜZENLE */
    .level-selector { gap: 10px; padding: 5px; }
    .level-btn { 
        padding: 10px 20px !important; 
        font-size: 0.95rem !important; 
        min-width: 130px; 
    }
}