/* ==========================================================================
   common.css
   Reset cơ bản + các thành phần dùng chung cho cả 3 trang: header (với menu
   dropdown danh sách sản phẩm), footer, button, form, badge, toast, modal,
   skeleton loading, tiện ích accessibility, decorative blob.
   ========================================================================== */

/* ---------- Reset / Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-3);
  line-height: var(--line-height-tight);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

p { margin: 0 0 var(--space-3); }

a {
  color: var(--color-blue);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

ul, ol { margin: 0; padding: 0; list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* ---------- Accessibility helpers ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 8px;
  top: -48px;
  background: var(--color-blue);
  color: #fff;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  z-index: var(--z-toast);
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 8px;
}

:focus-visible {
  outline: 3px solid var(--color-blue);
  outline-offset: 2px;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

@media (max-width: 599px) {
  .container { padding: 0 var(--space-4); }
}

.site-main {
  min-height: calc(100vh - var(--header-height) - 260px);
}

/* ---------- Decorative blobs ---------- */
.bg-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  pointer-events: none;
  z-index: 0;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  height: var(--header-height);
}

.brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  margin-right: var(--space-2);
}

.brand-logo {
  height: 42px;
  width: auto;
  display: block;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  color: var(--color-text-primary);
  border-radius: var(--radius-sm);
  margin-left: auto;
}
.nav-toggle:hover { background: var(--color-surface-alt); }

.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-blue);
  background: var(--color-blue-light);
  text-decoration: none;
}

.nav-link.active {
  color: var(--color-blue);
  font-weight: var(--font-weight-semibold);
}

/* ---- Nav dropdown: danh sách các trang / sản phẩm ---- */
.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  padding: var(--space-3) var(--space-3);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-dropdown-toggle:hover { color: var(--color-blue); background: var(--color-blue-light); }
.nav-dropdown-toggle svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}
.nav-dropdown-toggle[aria-expanded="true"] svg { transform: rotate(180deg); }
.nav-dropdown-toggle[aria-expanded="true"] { color: var(--color-blue); background: var(--color-blue-light); }

.nav-dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 340px;
  max-width: 400px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  padding: var(--space-3);
  z-index: var(--z-dropdown);
  display: none;
  max-height: 70vh;
  overflow-y: auto;
}
.nav-dropdown-menu.open {
  display: block;
  animation: dropdown-in var(--transition-base);
}
@keyframes dropdown-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

.nav-dropdown-menu-title {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3) var(--space-1);
}

.nav-dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  text-align: left;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: none;
  border: none;
  color: var(--color-text-primary);
  transition: background var(--transition-fast);
}
.nav-dropdown-item:hover,
.nav-dropdown-item:focus-visible {
  background: var(--color-surface-alt);
  text-decoration: none;
}

.nav-dropdown-item-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.nav-dropdown-item-icon img { width: 100%; height: 100%; object-fit: cover; object-position: top; }

.nav-dropdown-item-text { flex: 1; min-width: 0; }
.nav-dropdown-item-name {
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-dropdown-item-category {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.nav-dropdown-empty {
  padding: var(--space-4);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.nav-dropdown-footer {
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
}
.nav-dropdown-footer a {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-blue);
  border-radius: var(--radius-md);
}
.nav-dropdown-footer a:hover { background: var(--color-blue-light); text-decoration: none; }
.nav-dropdown-footer svg { width: 16px; height: 16px; }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-shrink: 0;
}

.admin-link {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--space-2) var(--space-2);
  white-space: nowrap;
}
.admin-link:hover { color: var(--color-blue); text-decoration: none; }

/* Language switcher */
.lang-switcher {
  position: relative;
}

.lang-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  transition: background var(--transition-fast);
}
.lang-btn:hover { background: var(--color-border); }
.lang-btn svg { width: 16px; height: 16px; color: var(--color-blue); }

.lang-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 160px;
  z-index: var(--z-dropdown);
  padding: var(--space-1);
  display: none;
}
.lang-menu.open { display: block; }

.lang-menu button {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.lang-menu button:hover { background: var(--color-surface-alt); }
.lang-menu button[aria-checked="true"] {
  color: var(--color-blue);
  font-weight: var(--font-weight-semibold);
}

@media (max-width: 899px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .main-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    display: none;
    padding: var(--space-2) var(--space-4) var(--space-4);
    max-height: calc(100vh - var(--header-height));
    overflow-y: auto;
  }
  .main-nav.open { display: flex; }
  .nav-link { padding: var(--space-3) var(--space-2); border-bottom: 1px solid var(--color-border); border-radius: 0; }
  .nav-dropdown { width: 100%; }
  .nav-dropdown-toggle { width: 100%; justify-content: space-between; border-bottom: 1px solid var(--color-border); border-radius: 0; padding: var(--space-3) var(--space-2); }
  .nav-dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-bottom: 1px solid var(--color-border);
    min-width: 0;
    max-width: none;
    padding: var(--space-2) 0 var(--space-2) var(--space-3);
  }
  .header-actions { margin-left: 0; }
  .admin-link { display: none; }
}

@media (min-width: 900px) {
  .mobile-only-link { display: none; }
}

@media (max-width: 480px) {
  .header-actions .btn-cta { display: none; }
  .brand-logo { height: 34px; }
}
@media (max-width: 599px) {
  .header-inner { gap: var(--space-2); }
  .header-actions { gap: var(--space-2); }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn svg { width: 18px; height: 18px; }

.btn-primary {
  background: var(--color-orange);
  color: #fff;
}
.btn-primary:hover { background: var(--color-orange-dark); text-decoration: none; box-shadow: var(--shadow-orange-glow); }

.btn-secondary {
  background: var(--color-blue);
  color: #fff;
}
.btn-secondary:hover { background: var(--color-blue-dark); text-decoration: none; box-shadow: var(--shadow-blue-glow); }

.btn-outline {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}
.btn-outline:hover { border-color: var(--color-blue); color: var(--color-blue); text-decoration: none; }

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
}
.btn-ghost:hover { background: var(--color-surface-alt); text-decoration: none; }

.btn-danger {
  background: var(--color-error);
  color: #fff;
}
.btn-danger:hover { background: #b62f2f; }

.btn-cta {
  background: var(--gradient-cta);
  color: #fff;
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-5);
  box-shadow: 0 4px 14px rgba(243, 112, 33, 0.35);
}
.btn-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 22px rgba(243, 112, 33, 0.45);
  text-decoration: none;
}

.btn-white {
  background: #fff;
  color: var(--color-blue);
}
.btn-white:hover { background: var(--color-blue-light); text-decoration: none; }

.btn-outline-white {
  background: transparent;
  border-color: rgba(255, 255, 255, 0.5);
  color: #fff;
}
.btn-outline-white:hover { background: rgba(255, 255, 255, 0.12); border-color: #fff; text-decoration: none; }

.btn-sm { padding: var(--space-1) var(--space-3); font-size: var(--font-size-xs); }
.btn-lg { padding: 14px var(--space-6); font-size: var(--font-size-base); }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

/* ---------- Forms ---------- */
.form-group { margin-bottom: var(--space-4); }

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  color: var(--color-text-primary);
}

.required-mark { color: var(--color-error); }

.form-control {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-primary);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-control:focus {
  outline: none;
  border-color: var(--color-blue);
  box-shadow: var(--shadow-focus);
}
.form-control.has-error {
  border-color: var(--color-error);
}
.form-control::placeholder { color: var(--color-text-muted); }

.form-hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.form-error {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
}
.form-error svg { width: 14px; height: 14px; flex-shrink: 0; }

.input-with-icon {
  position: relative;
}
.input-with-icon svg {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--color-text-muted);
  pointer-events: none;
}
.input-with-icon input { padding-left: var(--space-7); }

/* ---------- Badges ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}
.badge svg { width: 12px; height: 12px; }
.badge-success { background: var(--color-success-bg); color: var(--color-success); }
.badge-error { background: var(--color-error-bg); color: var(--color-error); }
.badge-warning { background: var(--color-warning-bg); color: var(--color-warning); }
.badge-neutral { background: var(--color-surface-alt); color: var(--color-text-secondary); }
.badge-info { background: var(--color-info-bg); color: var(--color-info); }

/* ---------- Toast notifications ---------- */
.toast-container {
  position: fixed;
  top: var(--space-5);
  right: var(--space-5);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 360px;
  width: calc(100% - 2 * var(--space-5));
}

@media (max-width: 599px) {
  .toast-container { left: var(--space-4); right: var(--space-4); max-width: none; width: auto; }
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  background: var(--color-surface);
  border-left: 4px solid var(--color-blue);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-sm);
  animation: toast-in var(--transition-slow);
}
.toast.toast-success { border-left-color: var(--color-success); }
.toast.toast-error { border-left-color: var(--color-error); }
.toast.toast-warning { border-left-color: var(--color-warning); }
.toast svg { width: 20px; height: 20px; flex-shrink: 0; margin-top: 1px; }
.toast.toast-success svg { color: var(--color-success); }
.toast.toast-error svg { color: var(--color-error); }
.toast.toast-warning svg { color: var(--color-warning); }
.toast.toast-info svg { color: var(--color-blue); }
.toast-message { flex: 1; color: var(--color-text-primary); }
.toast-close { background: none; border: none; color: var(--color-text-muted); padding: 2px; }

@keyframes toast-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  z-index: var(--z-modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}
.modal-backdrop[hidden] { display: none; }

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 520px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  z-index: var(--z-modal);
  padding: var(--space-6);
  animation: modal-in var(--transition-base);
}
@keyframes modal-in {
  from { opacity: 0; transform: scale(0.96) translateY(8px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}
.modal-close {
  background: none;
  border: none;
  color: var(--color-text-muted);
  padding: var(--space-1);
  border-radius: var(--radius-sm);
}
.modal-close:hover { background: var(--color-surface-alt); }
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  margin-top: var(--space-5);
  flex-wrap: wrap;
}

/* ---------- Skeleton loading ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--color-surface-alt) 25%, var(--color-border) 37%, var(--color-surface-alt) 63%);
  background-size: 400% 100%;
  animation: skeleton-shine 1.4s ease infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-shine {
  0% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

/* ---------- Value cards (Core values / Why choose us) ---------- */
.values-section {
  padding: var(--space-8) 0;
}
.section-header-center {
  /* text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-7); */
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.section-header-center h2 {
  font-size: var(--font-size-lg);
  display: flex;
  align-items: center;
  gap: var(--space-2, 8px);
  position: relative;
  padding-left: 14px; 
}

.section-header-center h2::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 1.1em; 
  background-color: var(--color-orange); 
  border-radius: 2px;

}

/* .section-header-center h2 { font-size: var(--font-size-2xl); }
.section-header-center p { color: var(--color-text-secondary); font-size: var(--font-size-md); } */

.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-5);
}

.value-card {
  /* background: var(--color-surface); */
  /* border: 1px solid var(--color-border); */
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}
/* .value-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
} */
.value-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: var(--gradient-brand-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}
.value-card-icon svg { width: 26px; height: 26px; color: var(--color-blue); }
.value-card h3 { font-size: var(--font-size-md); margin-bottom: var(--space-2); }
.value-card p { color: var(--color-text-secondary); font-size: var(--font-size-sm); margin-bottom: 0; }

/* ---------- Footer ---------- */
.site-footer {
  padding : 2vw;
  background: var(--color-blue-dark);
  color: rgba(255, 255, 255, 0.85);
  margin-top: var(--space-8);
  position: relative;
  overflow: hidden;
}

.footer-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: var(--space-6);
  padding: var(--space-7) 0 var(--space-5);
}

@media (max-width: 899px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 599px) {
  .footer-inner { 
    grid-template-columns: 1fr; 
    padding: var(--space-6) 0 var(--space-4); 
    /* display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center; */
  }
}

.footer-brand { 
  height: 10vh;
  display: flex; 
  align-items: center; margin-bottom: var(--space-4); }
.footer-brand img { 
  height: 100% !important; width: auto;
 }

.footer-col h4 {
  color: #fff;
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
}
.footer-col ul li { margin-bottom: var(--space-2); }
.footer-col a { color: rgba(255, 255, 255, 0.75); }
.footer-col a:hover { color: #fff; }
.footer-col p { color: rgba(255, 255, 255, 0.7); font-size: var(--font-size-sm); }

.footer-bottom {
  position: relative;
  z-index: 1;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: var(--space-4) 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.65);
}

@media (max-width: 768px) {
  .value-card {
    max-width: 340px;
    margin: 0 auto;
    text-align: center;

    display: flex;
    flex-direction: column;
    align-items: center;
  }

  .value-card-icon {
    margin: 0 auto var(--space-4);
  }

  .value-card p {
    max-width: 280px;
    margin: 0 auto;
  }
}

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.hidden { display: none !important; }