* { font-family: 'Roboto', sans-serif !important; box-sizing: border-box; }
body, html { margin: 0; padding: 0; min-height: 100vh; background-color: var(--bg-color); color: var(--primary-color); transition: background-color 0.4s ease; display: flex; flex-direction: column; align-items: center; padding-top: 20px; overflow-x: hidden; }

:root {
    --bg-color: #eaf1f9; --card-color: #ffffff; --primary-color: #003366; 
    --accent-color: #4da6ff; --success: #27ae60; --error: #e74c3c; 
    --input-bg: #f4f8fd; --text-gray: #8a9ba8;
    --light-shadow: -8px -8px 16px rgba(255, 255, 255, 0.8);
    --dark-shadow: 8px 8px 16px rgba(0, 51, 102, 0.1);
    --inset-shadow: inset 4px 4px 8px rgba(0, 51, 102, 0.05), inset -4px -4px 8px rgba(255, 255, 255, 1);
}

body.dark-mode {
    --bg-color: #1a1e24; --card-color: #1a1e24; --primary-color: #e0e9f5; 
    --accent-color: #66b3ff; --input-bg: #14171c; 
    --light-shadow: -8px -8px 16px rgba(255, 255, 255, 0.03); 
    --dark-shadow: 8px 8px 16px rgba(0, 0, 0, 0.4); 
    --inset-shadow: inset 4px 4px 8px rgba(0, 0, 0, 0.5), inset -4px -4px 8px rgba(255, 255, 255, 0.02);
}

#desktop-blocker { display: none; position: fixed; top:0; left:0; width:100%; height:100%; background: var(--bg-color); z-index: 9999; flex-direction: column; justify-content: center; align-items: center; text-align: center; padding: 20px; }
#offline-banner { display: none; background: var(--error); color: white; text-align: center; padding: 10px; width: 100%; position: fixed; top: 0; z-index: 1000; font-weight: bold; font-size: 14px; }

.neumorphic-card-light {
    background: var(--card-color); width: 90%; max-width: 400px; padding: 30px 20px; border-radius: 30px;
    box-shadow: var(--dark-shadow), var(--light-shadow); text-align: center; position: relative; margin-bottom: 20px;
}

.theme-switch-wrapper { position: absolute; top: 20px; left: 20px; }
.theme-switch { display: inline-block; height: 24px; position: relative; width: 46px; }
.theme-switch input { display: none; }
.slider { background-color: #cbd4db; bottom: 0; cursor: pointer; left: 0; position: absolute; right: 0; top: 0; transition: .4s; border-radius: 24px; }
.slider:before { background-color: #fff; bottom: 3px; content: ""; height: 18px; left: 3px; position: absolute; transition: .4s; width: 18px; border-radius: 50%; }
input:checked + .slider { background-color: var(--accent-color); }
input:checked + .slider:before { transform: translateX(22px); }

.celebration-ribbon { position: absolute; top: 20px; right: 20px; background: #e74c3c; color: white; padding: 5px 10px; font-size: 12px; font-weight: bold; border-radius: 10px; box-shadow: 2px 2px 5px rgba(0,0,0,0.2); }

.logo-container {
    width: 100px; height: 100px; margin: 0 auto 15px auto; border-radius: 50%; background: var(--card-color);
    box-shadow: var(--dark-shadow), var(--light-shadow); display: flex; align-items: center; justify-content: center;
}
.logo-school { width: 70px; height: auto; }

h2 { font-size: 18px; font-weight: 900; margin: 10px 0 5px 0; }
.uni-name { font-size: 12px; color: var(--text-gray); font-weight: 500; text-transform: uppercase; margin-bottom: 25px; }

.form-control {
    -webkit-appearance: none; appearance: none; width: 100%; height: 50px; background: var(--input-bg); border: none;
    border-radius: 15px; font-size: 15px; font-weight: 700; color: var(--primary-color); text-align: center;
    box-shadow: var(--inset-shadow); outline: none; transition: 0.3s ease; margin-bottom: 15px;
}
.form-control:focus { border: 2px solid var(--accent-color); }
input[type="number"]::-webkit-outer-spin-button, input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
input[type="number"] { -moz-appearance: textfield; }

/* --- CẬP NHẬT UX MẬT KHẨU --- */
.password-wrapper { position: relative; width: 100%; margin-bottom: 15px; }
.password-wrapper .form-control { margin-bottom: 0 !important; padding-right: 45px; }
.toggle-password { position: absolute; right: 15px; top: 50%; transform: translateY(-50%); cursor: pointer; font-size: 18px; user-select: none; opacity: 0.6; transition: opacity 0.3s; }
.toggle-password:hover { opacity: 1; transform: translateY(-50%) scale(1.1); }
.password-rules { font-size: 12px; color: var(--text-gray); text-align: left; margin: -10px 0 15px 15px; padding-left: 15px; line-height: 1.5; }

.btn-primary {
    -webkit-appearance: none; appearance: none; width: 100%; background: linear-gradient(135deg, #66b3ff 0%, #0073e6 100%);
    color: white; border: none; padding: 15px; border-radius: 15px; font-weight: 900; font-size: 15px; margin-top: 10px;
    cursor: pointer; box-shadow: 5px 5px 15px rgba(0, 115, 230, 0.3); transition: 0.2s;
}
.btn-primary:active { transform: scale(0.96); box-shadow: none; }
.btn-scan { background: linear-gradient(135deg, #2ecc71, #27ae60); box-shadow: 5px 5px 15px rgba(39, 174, 96, 0.3); font-size: 16px; padding: 18px; }
.btn-secondary { background: transparent; color: var(--text-gray); border: none; padding: 10px; margin-top: 15px; font-weight: bold; font-size: 13px; text-decoration: underline; width: 100%; }

#status-container { margin-top: 20px; min-height: 25px; display: flex; flex-direction: column; align-items: center; gap: 10px; }
.loader { display: none; border: 3px solid var(--input-bg); border-top: 3px solid var(--accent-color); border-radius: 50%; width: 24px; height: 24px; animation: spin 1s linear infinite; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.history-section { width: 90%; max-width: 400px; margin-bottom: 20px; }
.history-header { display: flex; justify-content: space-between; font-weight: 800; font-size: 13px; color: var(--text-gray); margin-bottom: 15px; padding: 0 10px; }
.clear-btn { color: var(--error); cursor: pointer; }
.history-card { background: var(--card-color); padding: 15px; border-radius: 15px; box-shadow: var(--dark-shadow), var(--light-shadow); display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.history-info { display: flex; flex-direction: column; text-align: left; }
.h-mssv { font-weight: 800; font-size: 14px; }
.h-time { font-size: 11px; color: var(--text-gray); margin-top: 3px; }
.h-status { font-weight: 700; font-size: 12px; padding: 5px 10px; border-radius: 8px; }
.h-success { background: rgba(39, 174, 96, 0.1); color: var(--success); }
.h-error { background: rgba(231, 76, 60, 0.1); color: var(--error); }

.footer { text-align: center; font-size: 11px; color: var(--text-gray); padding-bottom: 30px; line-height: 1.6; width: 90%; max-width: 400px; }

/* Custom SweetAlert UI */
div:where(.swal2-container) div:where(.swal2-popup) {
    border-radius: 20px;
    font-family: 'Roboto', sans-serif !important;
}