/* --- GENEL SIFIRLAMA VE TEMEL AYARLAR --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #0d0e15;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

/* --- ANA KAPSAYICI (OYUN KUTUSU) --- */
.container {
    text-align: center;
    background: #161925;
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 0 20px rgba(0, 255, 204, 0.2);
    width: 90%;
    max-width: 400px;
}

/* --- ÜST BAŞLIK VE AYARLAR BUTONU DÜZENİ --- */
.header-row {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    gap: 15px;
    margin-bottom: 10px;
}

h1 {
    font-size: 1.8rem;
    color: #00ffcc;
    text-shadow: 0 0 10px #00ffcc;
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    transition: 0.3s;
}

.icon-btn:hover {
    transform: rotate(45deg);
}

/* --- DURUM METNİ --- */
.status {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: #ff007f;
    font-weight: bold;
    min-height: 27px;
}

/* --- GİRİŞ / KAYIT VE ONLINE MENÜ INPUTLARI --- */
.auth-box, .online-menu {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 15px;
}

input {
    background: #1f2335;
    border: 2px solid #3b4261;
    color: #fff;
    padding: 12px;
    border-radius: 8px;
    font-size: 1rem;
    text-align: center;
    outline: none;
    transition: 0.3s;
}

input:focus {
    border-color: #00ffcc;
    box-shadow: 0 0 10px rgba(0, 255, 204, 0.3);
}

/* --- BUTONLAR VE MENÜ ELEMANLARI --- */
.auth-buttons {
    display: flex;
    gap: 10px;
}

.auth-buttons button {
    flex: 1;
    background: #1f2335;
    color: #fff;
    border: 2px solid #ff007f;
    padding: 12px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    transition: 0.3s;
}

.auth-buttons button:hover {
    background: #ff007f;
    box-shadow: 0 0 15px #ff007f;
    color: #fff;
}

.menu {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.menu button, #reset-btn {
    background: #1f2335;
    color: #fff;
    border: 2px solid #00ffcc;
    padding: 12px 24px;
    font-size: 1rem;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
    font-weight: bold;
    width: 100%;
}

.menu button:hover, #reset-btn:hover {
    background: #00ffcc;
    color: #0d0e15;
    box-shadow: 0 0 15px #00ffcc;
}

/* --- 3x3 OYUN TAHTASI VE HÜCRELER --- */
.board {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 100px);
    gap: 10px;
    margin: 20px auto;
    justify-content: center;
    max-width: 320px;
}

.cell {
    background: #1f2335;
    border: 2px solid #3b4261;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: 0.2s;
    user-select: none;
}

.cell:hover {
    background: #24283b;
}

/* X ve O Harflerinin Neon Efektleri */
.cell.X { 
    color: #ff007f; 
    text-shadow: 0 0 10px #ff007f; 
}

.cell.O { 
    color: #00ffff; 
    text-shadow: 0 0 10px #00ffff; 
}

/* --- MODAL PENCERELER (AYARLAR & SKOR TABLOSU) --- */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(13, 14, 21, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal-content {
    background: #161925;
    border: 2px solid #00ffcc;
    padding: 25px;
    border-radius: 16px;
    text-align: center;
    width: 85%;
    max-width: 350px;
    box-shadow: 0 0 25px #00ffcc;
}

.modal-content h2 {
    color: #00ffcc;
    margin-bottom: 15px;
    font-size: 1.4rem;
    text-shadow: 0 0 5px #00ffcc;
}

/* Skor Listesi Düzeni */
#leaderboard-list {
    text-align: left;
    margin: 15px 0;
    padding-left: 20px;
}

#leaderboard-list li {
    margin: 10px 0;
    font-size: 1.1rem;
    color: #fff;
    border-bottom: 1px dashed #3b4261;
    padding-bottom: 4px;
}

/* Ayarlar Seçenekleri Dizilimi */
.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 20px 0;
    font-size: 1.1rem;
}

/* Checkbox'ın siber temaya uyması için basit büyütme */
.setting-item input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #00ffcc;
}

.modal-content button {
    background: #1f2335;
    color: #fff;
    border: 2px solid #ff007f;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    margin-top: 10px;
    font-weight: bold;
    transition: 0.3s;
}

.modal-content button:hover {
    background: #ff007f;
    box-shadow: 0 0 10px #ff007f;
}

/* --- GİZLEME YARDIMCI SINIFI --- */
.hidden { 
    display: none !important; 
}