:root {
    --primary-color: #5D76DD;
    --secondary-color: #6A4FDE;
    --confirm-color: #7ED321;
    --danger-color: #D0021B;
    --text-color: #FFFFFF;
    --dark-text: #E0E0E0;
    --border-gradient: linear-gradient(145deg, var(--primary-color), var(--secondary-color));
    --input-bg: rgba(22, 28, 53, 0.6); 
    --font-family: 'Poppins', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    background-color: transparent;
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
}

.tablet-container {
    width: 550px;
    max-width: 95%;
    background: rgba(10, 15, 30, 0.85); 
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    
    border: 3px solid; 
    border-image-slice: 1; 
    border-image-source: var(--border-gradient);
    
    border-radius: 24px;
    
    position: relative;
    transform: scale(0.95) translateY(20px);
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), opacity 0.4s ease;
}

.tablet-screen {
    padding: 25px;
}

.tablet-container.visible {
    transform: scale(1) translateY(0);
    opacity: 1;
}

.panel {
    display: none;
    flex-direction: column;
    gap: 20px;
    animation: fadeIn 0.5s ease-in-out;
}

.panel.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.panel-header {
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 15px;
    background: transparent; 
}

.header-icon {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 10px;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.panel-header h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 5px;
}

.panel-header p {
    font-size: 0.9rem;
    color: var(--dark-text);
    font-weight: 300;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--dark-text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.input-group label .fa-solid {
    color: var(--primary-color);
}

.input-group input {
    background: var(--input-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 12px 15px;
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.input-group input::placeholder {
    color: #888;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.panel-footer {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.btn {
    flex-grow: 1;
    padding: 12px 20px;
    border-radius: 8px;
    border: none;
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.btn:hover {
    transform: translateY(-3px);
    opacity: 0.9;
}

.btn:active {
    transform: translateY(-1px);
}

.btn-primary { background: linear-gradient(145deg, #5D76DD, #6A4FDE); color: white; }
.btn-secondary { background-color: rgba(255, 255, 255, 0.1); color: var(--dark-text); border: 1px solid rgba(255, 255, 255, 0.1); }
.btn-secondary:hover { background-color: rgba(255, 255, 255, 0.2); }
.btn-confirm { background-color: var(--confirm-color); color: white; }
.btn-confirm:hover { background-color: #8fd83a; }
.btn-generate { background-color: var(--secondary-color); color: white; }
.btn-generate:hover { background-color: #7b61e4; }
.btn-group { flex-wrap: wrap; }
.full-width { width: 100%; flex-grow: 1; }

.confirmation-summary {
    background: var(--input-bg);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}
.confirmation-summary p { display: flex; justify-content: space-between; padding: 8px 0; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.confirmation-summary p:last-child { border-bottom: none; }
.confirmation-summary span { font-weight: 600; color: var(--secondary-color); }

.warning-box { background-color: rgba(208, 2, 27, 0.2); border: 1px solid var(--danger-color); border-radius: 8px; padding: 10px; margin-bottom: 15px; display: flex; align-items: center; gap: 10px; font-size: 0.9rem; }

.code-display { background: var(--input-bg); padding: 20px; border-radius: 8px; font-size: 1.5rem; font-weight: 600; text-align: center; letter-spacing: 2px; color: var(--secondary-color); position: relative; }
.copy-btn { position: absolute; top: 10px; right: 10px; background: none; border: none; color: var(--dark-text); font-size: 1.2rem; cursor: pointer; transition: color 0.3s; }
.copy-btn:hover { color: var(--text-color); }

#player-panel .input-group input { text-align: center; font-size: 1.2rem; letter-spacing: 2px; }

#receipt-panel { gap: 15px; }
.receipt-header { text-align: center; }
.receipt-header .icon-glow { width: 80px; height: 80px; margin: 0 auto 15px; border-radius: 50%; display: flex; justify-content: center; align-items: center; }
.receipt-header .icon-glow i { font-size: 2.5rem; color: var(--secondary-color); }
#receipt-title { font-size: 1.6rem; color: var(--secondary-color); }
#receipt-message { font-size: 0.9rem; color: var(--dark-text); }

.receipt-body ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.receipt-body li { background: var(--input-bg); border-radius: 8px; padding: 15px; display: flex; align-items: center; gap: 15px; border-left: 3px solid var(--secondary-color); }
.receipt-body li i { font-size: 1.5rem; color: var(--primary-color); width: 30px; text-align: center; }
.receipt-body li div { flex-grow: 1; }
.receipt-body li span { display: block; font-size: 0.9rem; color: var(--dark-text); }
.receipt-body li strong { font-size: 1.1rem; color: var(--text-color); }

.loading-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(10, 15, 30, 0.8); backdrop-filter: blur(5px); display: none; justify-content: center; align-items: center; z-index: 100; }
.loading-overlay.visible { display: flex; }
.spinner { width: 50px; height: 50px; border: 5px solid rgba(255, 255, 255, 0.1); border-top-color: var(--primary-color); border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

#notification-container { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); z-index: 9999; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.notification { padding: 15px 25px; border-radius: 12px; color: white; font-size: 1rem; font-weight: 500; display: flex; align-items: center; gap: 10px; border: 1px solid rgba(255, 255, 255, 0.2); backdrop-filter: blur(10px); transform: translateY(20px); opacity: 0; animation: slideInUp 0.5s forwards; }
@keyframes slideInUp { to { transform: translateY(0); opacity: 1; } }
.notification.success { background-color: rgba(126, 211, 33, 0.8); }
.notification.error { background-color: rgba(208, 2, 27, 0.8); }
.notification.info { background-color: rgba(74, 144, 226, 0.8); }

.tablet-nav {
    display: flex;
    margin-bottom: 20px;
    background-color: var(--input-bg);
    border-radius: 12px;
    padding: 5px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-btn {
    flex: 1;
    padding: 10px;
    background-color: transparent;
    border: none;
    color: var(--dark-text);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

.nav-btn.active {
    background: var(--border-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(93, 118, 221, 0.2);
}

.panel-content {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.panel-content.active {
    display: block;
}

.input-group select {
    background: var(--input-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: 12px 15px;
    color: var(--text-color);
    font-family: var(--font-family);
    font-size: 1rem;
    transition: all 0.3s ease;
    -webkit-appearance: none; 
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23E0E0E0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: left 15px center;
    background-size: 1em;
    padding-right: 15px;
    padding-left: 40px;
}

.input-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}