@font-face {
    font-family: 'Forma';
    src: url('Forma-Regular.otf') format('opentype');
    font-weight: normal;
    font-style: normal;
}
:root {
    --primary-color: #034ad6; --primary-hover: #023ba1;
    --secondary-color: #5d8de0; --success-color: #28a745;
    --danger-color: #dc3545; --warning-color: #ffc107;
    --bg-color: #f4f7fa; --card-bg: #ffffff;
    --text-color: #343a40; --text-light: #ffffff;
    --border-color: #dee2e6; --border-radius: 8px;
}
body {
    font-family: 'Forma', sans-serif; background-color: var(--bg-color);
    color: var(--text-color); margin: 0; padding: 20px; display: flex;
    justify-content: center; align-items: center; min-height: 100vh; box-sizing: border-box;
}
h1, h2, h3 { color: var(--primary-color); text-align: center; }
.setup-container, .container {
    background-color: var(--card-bg); padding: 25px 35px;
    border-radius: var(--border-radius); box-shadow: 0 4px 25px rgba(0, 0, 0, 0.1);
    width: 100%; max-width: 650px; display: flex; flex-direction: column;
    gap: 15px; position: relative; border: 1px solid var(--border-color);
}
.input-group {
    display: flex; gap: 10px; align-items: center;
}
#giftNameInput { flex-grow: 1; }
#giftQuantityInput { width: 80px; }

input[type="text"], input[type="number"], input[type="tel"] {
    padding: 12px; border-radius: var(--border-radius); border: 1px solid var(--border-color);
    background-color: #fff; color: var(--text-color); font-size: 16px;
    width: 100%; box-sizing: border-box;
}
input:focus {
    outline: none; border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(3, 74, 214, 0.2);
}
button {
    font-family: 'Forma', sans-serif; padding: 12px 20px; border: none; border-radius: var(--border-radius);
    font-size: 16px; font-weight: 700; cursor: pointer;
    transition: all 0.2s ease-in-out;
}
button:hover { transform: translateY(-2px); box-shadow: 0 4px 8px rgba(0,0,0,0.1); }
button:disabled { cursor: not-allowed; opacity: 0.5; transform: none; }
#addGiftButton, .modal-button-primary { background-color: var(--primary-color); color: var(--text-light); }
.action-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.reset-button { background-color: var(--danger-color); color: var(--text-light); }
.export-button { background-color: var(--success-color); color: var(--text-light); }
.back-icon-button { position: absolute; top: 20px; left: 25px; background: none; border: none;
    color: #6c757d; font-size: 30px; padding: 5px; line-height: 1;
    font-weight: bold; transition: color 0.3s, transform 0.2s; }
.back-icon-button:hover { color: var(--text-color); transform: scale(1.1); }
.start-button, #drawAgainButton, #initiateDrawButton {
    background-color: var(--secondary-color); color: var(--text-light);
    padding: 15px; font-size: 18px;
}
.modal-button-secondary { background-color: #6c757d; color: var(--text-light); }
.winners-list-display { list-style: none; padding: 0; margin: 0; max-height: 150px;
    overflow-y: auto; border: 1px solid var(--border-color); border-radius: var(--border-radius); }
.winners-list-display li { display: flex; align-items: center; padding: 10px;
    background-color: #f8f9fa; border-bottom: 1px solid var(--border-color); gap: 15px; }
.winners-list-display li:last-child { border-bottom: none; }
.winner-info { flex-grow: 1; display: flex; justify-content: space-between; align-items: center; }
.winner-name { font-weight: 500; }
.winner-details { text-align: right; font-size: 0.9em; color: #6c757d; }
.winner-prize { display: block; }
.winner-time { display: block; font-style: italic; }
#winnersCount { font-size: 0.8em; font-weight: normal; color: #495057;
    background-color: #e9ecef; padding: 3px 8px; border-radius: 10px;
    vertical-align: middle; margin-left: 8px; }
.summary-table { width: 100%; border-collapse: collapse; font-size: 0.95em; }
.summary-table th, .summary-table td {
    border: 1px solid var(--border-color); padding: 8px 12px;
    text-align: center; vertical-align: middle;
}
.summary-table th { background-color: #f8f9fa; font-weight: bold; }
.summary-table td:first-child { text-align: left; }
.post-draw-controls { display: flex; gap: 10px; justify-content: center; }
.redraw-button { background-color: var(--warning-color); color: var(--text-color); padding: 15px; font-size: 18px; }
.container { align-items: center; padding-top: 50px; }
.gift-box-container { display: flex; flex-wrap: wrap; justify-content: center;
    gap: 20px; width: 100%; max-width: 440px; perspective: 1000px; min-height: 260px; }
.gift-box-flipper { width: 120px; height: 120px; position: relative;
    transform-style: preserve-3d; transition: transform 0.6s ease; }
.gift-box-flipper:not(.flipped):hover { transform: scale(1.1); }
.gift-box-flipper.flipped { transform: rotateY(180deg); }
.gift-box-flipper.dummy { pointer-events: none; opacity: 0.6; }
.gift-box-flipper.winning-pick {
    border-radius: var(--border-radius);
    box-shadow: 0 0 0 4px var(--primary-color);
}
.gift-box-front, .gift-box-back { position: absolute; width: 100%; height: 100%;
    backface-visibility: hidden; display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    text-align: center; box-sizing: border-box; }
.gift-box-front {
    background-image: url('hop-qua.png'); background-size: contain;
    background-position: center; background-repeat: no-repeat;
    background-color: transparent; border: none; box-shadow: none; cursor: pointer;
}
.gift-box-back {
    background-color: var(--card-bg); color: var(--text-color);
    transform: rotateY(180deg); border: 1px solid var(--border-color);
    border-radius: var(--border-radius); padding: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}
.prize-name-in-box { 
    font-size: 18px; /* Phóng to text để cân đối do đã bỏ ảnh */
    font-weight: 700; 
    color: var(--primary-color);
    word-break: break-word; /* Đảm bảo tên dài tự xuống dòng */
}
.result-message { margin-top: 20px; font-size: 18px; font-weight: 700;
    color: var(--primary-color); min-height: 27px; text-align: center; }
.modal-overlay { z-index: 1000; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background-color: rgba(0, 0, 0, 0.5); display: flex; justify-content: center; align-items: center; }
.modal-content { background-color: var(--card-bg); padding: 30px;
    border-radius: var(--border-radius); width: 90%; max-width: 400px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.5); text-align: center; }
.modal-buttons { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 10px; }