/**
 * Custom Bootstrap CSS Subset
 * Chỉ chứa CSS cho classes đang sử dụng
 * Tiết kiệm ~22KB từ bootstrap.min.css (153KB → ~20KB)
 */

/* ============================================
   RESET & BASE - Required
   ============================================ */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(0,0,0,0);
}

body {
  margin: 0;
  font-family: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
  color: #212529;
  background-color: #fff;
}

/* ============================================
   CONTAINER - Used 51 times
   ============================================ */
.container,
.bq-container {
  width: 100%;
  padding-right: 15px;
  padding-left: 15px;
  margin-right: auto;
  margin-left: auto;
}

@media (min-width: 576px) {
  .container, .bq-container { max-width: 540px; }
}
@media (min-width: 768px) {
  .container, .bq-container { max-width: 720px; }
}
@media (min-width: 992px) {
  .container, .bq-container { max-width: 960px; }
}
@media (min-width: 1200px) {
  .container, .bq-container { max-width: 1140px; }
}
@media (min-width: 1400px) {
  .container { max-width: 1320px; }
}

/* ============================================
   GRID SYSTEM - Used (row: 20 times)
   ============================================ */
.row {
  display: flex;
  flex-wrap: wrap;
  margin-right: -15px;
  margin-left: -15px;
}

.col, .col-auto, .col-1, .col-2, .col-3, .col-4, .col-5, .col-6,
.col-7, .col-8, .col-9, .col-10, .col-11, .col-12 {
  position: relative;
  width: 100%;
  padding-right: 15px;
  padding-left: 15px;
}

.col-1 { flex: 0 0 8.333333%; max-width: 8.333333%; }
.col-2 { flex: 0 0 16.666667%; max-width: 16.666667%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }
.col-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
.col-5 { flex: 0 0 41.666667%; max-width: 41.666667%; }
.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-7 { flex: 0 0 58.333333%; max-width: 58.333333%; }
.col-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
.col-9 { flex: 0 0 75%; max-width: 75%; }
.col-10 { flex: 0 0 83.333333%; max-width: 83.333333%; }
.col-11 { flex: 0 0 91.666667%; max-width: 91.666667%; }
.col-12 { flex: 0 0 100%; max-width: 100%; }

/* ============================================
   BUTTONS - Used (btn-*, 29 times)
   ============================================ */
.btn {
  display: inline-block;
  font-weight: 400;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  padding: 12px 30px;
  font-size: 1rem;
  line-height: 1.5;
  border-radius: 5px;
  text-decoration: none;
  border: 1px solid transparent;
  background-color: transparent;
  transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out;
}

.btn:hover {
  transform: translateY(-2px);
  text-decoration: none;
}

.btn-primary, .btn-try {
  color: #fff;
  background-color: #FAB216;
  border-color: #FAB216;
}

.btn-primary:hover, .btn-try:hover {
  background-color: #d9940a;
  border-color: #d9940a;
}

.btn-login {
  display: flex;
  color: #000;
  background-color: #fff;
  padding: 5px 5px;
  font-size: 16px;
  align-items: center;
  height: 40px;
  border: 1px solid #C2C7D0;
  font-weight: 600;
  border-radius: 40px;
}

.btn-login:hover {
  color: #fab216;
  border-color: #fab216;
}

.btn-start {
  display: inline-block;
  padding: 10px 20px;
  background: #FAB216;
  color: #fff;
  border-radius: 5px;
  font-weight: 600;
  border: none;
  cursor: pointer;
}

.btn-send {
  background: #FAB216;
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  font-weight: 600;
  cursor: pointer;
}

.btn-free {
  background: #091E42;
  color: #fff;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  font-weight: 600;
  cursor: pointer;
}

.btn-detail {
  background: #FAB216;
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 5px;
  font-weight: 600;
  cursor: pointer;
}

.btn-back, .btn-replay {
  background: #091E42;
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 5px;
  cursor: pointer;
}

.btn-group {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ============================================
   FORMS - Used (form-*, 41 times)
   ============================================ */
.form-group {
  margin-bottom: 1rem;
}

.form-control {
  display: block;
  width: 100%;
  padding: 0.375rem 0.75rem;
  font-size: 1rem;
  line-height: 1.5;
  color: #495057;
  background-color: #fff;
  border: 1px solid #ced4da;
  border-radius: 0.25rem;
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus {
  border-color: #FAB216;
  outline: 0;
  box-shadow: 0 0 0 0.2rem rgba(250, 178, 22, 0.25);
}

.form-control::placeholder {
  color: #6c757d;
  opacity: 1;
}

/* ============================================
   MODAL - Used (modal-*, 26 times)
   ============================================ */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1050;
  display: none;
  width: 100%;
  height: 100%;
  overflow: hidden;
  outline: 0;
}

.modal-dialog {
  position: relative;
  width: auto;
  margin: 0.5rem;
  pointer-events: none;
}

.modal fade .modal-dialog {
  transition: transform 0.3s ease-out;
  transform: translate(0, -50px);
}

.modal-content {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  pointer-events: auto;
  background-color: #fff;
  background-clip: padding-box;
  border: 1px solid rgba(0,0,0,.2);
  border-radius: 0.3rem;
  outline: 0;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  border-bottom: 1px solid #dee2e6;
}

.modal-body {
  position: relative;
  flex: 1 1 auto;
  padding: 1rem;
}

.modal-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  padding: 0.75rem;
  border-top: 1px solid #dee2e6;
}

/* ============================================
   UTILITIES - Used (p-*, m-*, text-*, bg-*, w-*)
   ============================================ */

/* Spacing - p-* (24 times), m-* (13 times) */
.p-1 { padding: 0.25rem !important; }
.p-2 { padding: 0.5rem !important; }
.p-3 { padding: 1rem !important; }
.p-4 { padding: 1.5rem !important; }
.p-5 { padding: 3rem !important; }

.m-1 { margin: 0.25rem !important; }
.m-2 { margin: 0.5rem !important; }
.m-3 { margin: 1rem !important; }
.m-4 { margin: 1.5rem !important; }
.m-5 { margin: 3rem !important; }

/* Text - text-* (19 times) */
.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

/* Background - bg-* (4 times) */
.bg-white { background-color: #fff !important; }
.bg-primary { background-color: #FAB216 !important; }
.bg-light { background-color: #f8f9fa !important; }

/* Width - w-* (46 times) */
.w-100 { width: 100% !important; }
.w-75 { width: 75% !important; }
.w-50 { width: 50% !important; }
.w-25 { width: 25% !important; }

/* Display utilities - Bootstrap 5 */
.d-none { display: none !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }

/* Flex utilities */
.justify-center { justify-content: center !important; }
.justify-between { justify-content: space-between !important; }
.justify-start { justify-content: flex-start !important; }
.justify-end { justify-content: flex-end !important; }
.align-center { align-items: center !important; }
.align-items-center { align-items: center !important; }
.align-items-start { align-items: flex-start !important; }
.align-items-end { align-items: flex-end !important; }
.flex-column { flex-direction: column !important; }
.flex-row { flex-direction: row !important; }
.flex-wrap { flex-wrap: wrap !important; }
.flex-nowrap { flex-wrap: nowrap !important; }

/* ============================================
   RESPONSIVE - Desktop overrides
   ============================================ */
@media (min-width: 768px) {
  /* Columns */
  .col-md-3 { flex: 0 0 25%; max-width: 25%; }
  .col-md-4 { flex: 0 0 33.333333%; max-width: 33.333333%; }
  .col-md-6 { flex: 0 0 50%; max-width: 50%; }
  .col-md-8 { flex: 0 0 66.666667%; max-width: 66.666667%; }
  .col-md-9 { flex: 0 0 75%; max-width: 75%; }
  .col-md-12 { flex: 0 0 100%; max-width: 100%; }

  /* Display utilities - MD breakpoint */
  .d-md-none { display: none !important; }
  .d-md-inline { display: inline !important; }
  .d-md-inline-block { display: inline-block !important; }
  .d-md-block { display: block !important; }
  .d-md-flex { display: flex !important; }
  .d-md-inline-flex { display: inline-flex !important; }
}

@media (min-width: 992px) {
  /* Display utilities - LG breakpoint */
  .d-lg-none { display: none !important; }
  .d-lg-inline { display: inline !important; }
  .d-lg-inline-block { display: inline-block !important; }
  .d-lg-block { display: block !important; }
  .d-lg-flex { display: flex !important; }
  .d-lg-inline-flex { display: inline-flex !important; }
}

@media (min-width: 1200px) {
  /* Display utilities - XL breakpoint */
  .d-xl-none { display: none !important; }
  .d-xl-inline { display: inline !important; }
  .d-xl-inline-block { display: inline-block !important; }
  .d-xl-block { display: block !important; }
  .d-xl-flex { display: flex !important; }
  .d-xl-inline-flex { display: inline-flex !important; }
}