/* Reset & Base */
:root {
    --primary-color: #d90429; /* Đỏ Tết */
    --secondary-color: #ef233c;
    --gold-color: #ffd700;
    --text-color: #2b2d42;
    --bg-color: #fff0f3;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow-x: hidden;
}

/* Hoa Đào Rơi Effect */
.sakura {
    position: fixed;
    top: -10vh;
    z-index: 9999;
    pointer-events: none;
    animation: fall linear infinite;
}

@keyframes fall {
    0% { top: -10vh; transform: translateX(0) rotate(0deg); opacity: 1; }
    100% { top: 110vh; transform: translateX(100px) rotate(360deg); opacity: 0; }
}

/* Layout */
.main-container {
    max-width: 800px; /* Giao diện dạng dọc như yêu cầu */
    margin: 0 auto;
    background: #fff;
    min-height: 100vh;
    box-shadow: 0 0 20px rgba(0,0,0,0.1);
    padding-bottom: 50px;
    position: relative;
    z-index: 1;
}

.header {
    background: url('https://cdn.pixabay.com/photo/2017/01/22/17/03/chinese-new-year-2000418_1280.jpg') no-repeat center top;
    background-size: cover;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.logo-img {
    max-height: 100px;
    border: 3px solid var(--gold-color);
    border-radius: 50%;
    background: #fff;
    padding: 5px;
}

.section-box {
    margin: 15px;
    padding: 20px;
    border-radius: 15px;
    background: #fff;
    border: 1px solid #ffecec;
    box-shadow: 0 5px 15px rgba(217, 4, 41, 0.1);
}

.section-title {
    color: var(--primary-color);
    font-weight: bold;
    border-bottom: 2px solid var(--gold-color);
    padding-bottom: 10px;
    margin-bottom: 15px;
    text-transform: uppercase;
}

/* Buttons */
.btn-tet {
    background: var(--primary-color);
    color: var(--gold-color);
    border: none;
    font-weight: bold;
}
.btn-tet:hover {
    background: var(--secondary-color);
    color: #fff;
}

/* Wheel */
.wheel-container {
    text-align: center;
    position: relative;
    width: 300px;
    height: 300px;
    margin: 0 auto;
    background: url('https://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Lucky_Wheel.svg/1024px-Lucky_Wheel.svg.png') no-repeat center;
    background-size: contain;
    transition: transform 3s ease-out;
}
.wheel-pointer {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    z-index: 5;
    color: var(--primary-color);
}

/* Notification Modal */
.modal-header {
    background: var(--primary-color);
    color: var(--gold-color);
}

/* Admin Specific */
.admin-badge {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 100;
}