/* --- BIẾN MÀU VÀ CÀI ĐẶT CHUNG --- */
:root {
  --primary-color: #007bff;
  --primary-hover: #0056b3;
  --secondary-color: #17a2b8;
  --secondary-hover: #117a8b;
  --success-color: #28a745;
  --light-gray: #f8f9fa;
  --border-color: #dee2e6;
  --text-color: #212529;
  --text-muted: #6c757d;
  --body-bg: #f4f7f9;
  --card-bg: #ffffff;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  --border-radius: 12px;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--body-bg);
  color: var(--text-color);
  margin: 0;
  padding: 20px;
}

/* --- TIÊU ĐỀ TRANG WEB --- */
.site-header {
    text-align: center;
    margin-bottom: 30px;
    padding: 0 20px;
}
.site-header h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-color);
}
.site-header p {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

/* --- BỐ CỤC HAI CỘT CÂN BẰNG --- */
.main-container {
  display: flex;
  gap: 30px;
  max-width: 1100px;
  margin: 0 auto;
  align-items: stretch;
}

.form-column, .qr-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* --- KIỂU DÁNG CARD --- */
.card {
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  padding: 30px;
  width: 100%;
  flex-grow: 1;
  box-sizing: border-box;
}

.card-header h3 {
  margin: 0 0 25px 0;
  font-size: 24px;
  font-weight: 600;
  color: var(--text-color);
  text-align: center;
}

/* --- KIỂU DÁNG FORM --- */
.formrow { margin-bottom: 18px; }

label {
  display: block;
  font-weight: 500;
  margin-bottom: 6px;
  font-size: 14px;
}

label.required::after { content: " *"; color: #dc3545; }

input[type="text"], input[type="number"], select {
  width: 100%;
  padding: 10px 12px;
  font-size: 16px;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  box-sizing: border-box;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
}

/* --- KIỂU DÁNG NÚT BẤM --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 12px 15px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  border-radius: 6px;
  border: none;
  transition: all 0.2s ease-in-out;
  gap: 8px;
}

.btn:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
.btn:disabled { background-color: #cccccc; cursor: not-allowed; }

.btn-primary { background-color: var(--primary-color); color: white; }
.btn-primary:hover:not(:disabled) { background-color: var(--primary-hover); }

.btn-secondary { background-color: var(--secondary-color); color: white; }
.btn-secondary:hover:not(:disabled) { background-color: var(--secondary-hover); }

/* --- KHU VỰC KẾT QUẢ --- */
.qr-column .card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

#qr-result-placeholder { text-align: center; }
#qr-result-placeholder i { font-size: 60px; color: #e0e0e0; }
#qr-result-placeholder p { margin-top: 15px; font-size: 18px; color: #a0a0a0; font-weight: 500; }

#qr-result-wrapper {
    width: 100%;
    display: none;
    flex-direction: column;
    align-items: center;
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

#qrimg {
  max-width: 100%;
  height: auto;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
}

.qr-info {
    width: 100%;
    text-align: left;
    background-color: var(--light-gray);
    padding: 15px;
    border-radius: 6px;
    margin-bottom: 15px;
    word-break: break-all;
}

.qr-info b { color: var(--text-muted); }
.qr-info-content { display: flex; justify-content: space-between; align-items: center; margin-top: 5px; gap: 10px; }
#qrstr, #qrc { flex-grow: 1; cursor: pointer; }

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 16px;
    padding: 5px;
    line-height: 1;
    border-radius: 50%;
    transition: color 0.2s, background-color 0.2s;
    flex-shrink: 0;
}
.copy-btn:hover {
    color: var(--primary-color);
    background-color: #e9ecef;
}
.copy-btn .fa-check {
    color: var(--success-color);
}

/* --- TÙY CHỈNH SELECT2 --- */
.select2-container--default .select2-selection--single { height: 42px; border: 1px solid var(--border-color); border-radius: 6px; }
.select2-container--default .select2-selection--single .select2-selection__rendered { line-height: 40px; padding-left: 12px; }
.select2-container--default .select2-selection--single .select2-selection__arrow { height: 40px; }
.select2-dropdown { border: 1px solid var(--border-color); border-radius: 6px; box-shadow: var(--shadow); }
.select2-results__option .bank-logo { height: 25px; margin-right: 10px; vertical-align: middle; }
.select2-selection__rendered .bank-logo { height: 25px; margin-right: 10px; vertical-align: middle; }
.select2-container--default .select2-results__option--highlighted.select2-results__option--selectable { background-color: var(--primary-color); }

/* --- RESPONSIVE --- */
@media (max-width: 992px) {
    .main-container {
        flex-direction: column;
    }
}

/* MỚI: KIỂU DÁNG FOOTER */
.site-footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--text-muted);
    font-size: 14px;
}
.site-footer p {
    margin: 5px 0;
}

.visit-counter {
    display: inline-block;
    background-color: var(--card-bg);
    padding: 8px 16px;
    border-radius: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    margin-bottom: 15px;
    font-weight: 500;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}
.visit-counter i {
    color: var(--primary-color);
    margin-right: 5px;
}

.cf-turnstile {
    display: flex;
    justify-content: center;
}