/* ==================================================
   SHARED STYLES - Được sử dụng chung cho tất cả pages
   ================================================== */

/* ==================================================
   1. RESET & BASE STYLES
   ================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
}

.container {
  margin: 0 var(--size-spacing-xxl);
}

/* ==================================================
   2. TYPOGRAPHY
   ================================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-weight-medium);
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

h1 { font-size: var(--font-size-xxxxl); }
h2 { font-size: var(--font-size-xxl); }
h3 { font-size: var(--font-size-l); }
h4 { font-size: var(--font-size-m); }
h5 { font-size: var(--font-size-s); }
h6 { font-size: var(--font-size-s); }

a {
  text-decoration: none;
  color: inherit;
}

/* ==================================================
   3. BUTTONS & FORM ELEMENTS
   ================================================== */

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--button-padding-top-m) var(--button-padding-sides-m);
  border: none;
  border-radius: var(--button-border-radius);
  font-size: var(--font-size-s);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-duration-normal) ease;
  min-height: var(--button-height-m);
  gap: var(--size-spacing-s);
}

.btn-primary {
  background-color: var(--button-color-bg-primary);
  color: var(--color-white);
}
.btn-primary:hover {
  background-color: var(--button-color-bg-primary-hover);
}

.btn-secondary {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
}
.btn-secondary:hover {
  background-color: var(--color-border-tertiary);
}

.btn-outline {
  background-color: var(--color-white);
  color: var(--color-black);
  border: var(--size-border-width-s) solid var(--color-grey-300);
}
.btn-outline:hover {
  background-color: var(--button-color-bg-primary-hover);
  color: var(--color-white);
  border-color: var(--button-color-bg-primary-hover);
}

.btn-social {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: var(--size-border-width-s) solid var(--color-grey-200);
  justify-content: flex-start;
  padding: var(--button-padding-top-m) var(--size-spacing-m);
}
.btn-social:hover {
  background-color: var(--color-bg-hover);
}

.btn-full {
  width: 100%;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: transparent;
  cursor: pointer;
  border-radius: 50%;
  transition: all var(--transition-duration-normal) ease;
  position: relative;
}
.icon-btn:hover {
  background-color: var(--color-bg-secondary);
}

/* Form Elements */
.form-group {
  margin-bottom: var(--size-spacing-l);
}

.form-group input {
  width: 100%;
  padding: var(--size-spacing-m);
  border: var(--size-border-width-s) solid var(--color-grey-200);
  border-radius: var(--size-border-radius-s);
  font-size: var(--font-size-s);
  transition: border-color var(--transition-duration-normal) ease;
}
.form-group input:focus {
  outline: none;
}

.checkbox {
  display: flex;
  align-items: center;
  gap: var(--size-spacing-s);
  cursor: pointer;
  font-size: var(--font-size-xs);
}

.checkbox input {
  display: none;
}

.checkmark {
  width: 16px;
  height: 16px;
  border: var(--size-border-width-s) solid var(--color-grey-200);
  border-radius: var(--size-border-radius-s);
  position: relative;
  transition: all var(--transition-duration-normal) ease;
}

.checkbox input:checked + .checkmark {
  background-color: var(--color-text-primary);
  border-color: var(--color-text-primary);
}

.checkbox input:checked + .checkmark::after {
  content: "✓";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--color-white);
  font-size: var(--font-size-xxs);
}

/* ==================================================
   4. BUTTONS & FORM ELEMENTS
   ================================================== */
.cart-count {
  position: absolute;
  top: -5px;
  right: -5px;
  background-color: var(--color-text-primary);
  color: var(--color-white);
  border-radius: 50%;
  width: 18px;
  height: 18px;
  font-size: var(--font-size-xxs);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-medium);
}

.cart-sidebar {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background-color: var(--color-white);
  z-index: 2000;
  transition: right var(--transition-duration-normal) ease;
  display: flex;
  flex-direction: column;
  border-left: var(--size-border-width-s) solid var(--color-border-tertiary);
}
.cart-sidebar.active {
  right: 0;
}

.cart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--size-spacing-l);
  border-bottom: var(--size-border-width-s) solid var(--color-grey-100);
}
.cart-header h3 {
  margin: 0;
  font-size: var(--font-size-m);
}

.cart-close {
  background: none;
  border: none;
  font-size: var(--font-size-m);
  cursor: pointer;
  padding: var(--size-spacing-xs);
  border-radius: 50%;
  transition: background-color var(--transition-duration-normal) ease;
}
.cart-close:hover {
  background-color: var(--color-bg-secondary);
}

.cart-content {
  flex: 1;
  padding: var(--size-spacing-l);
  overflow-y: auto;
}

.cart-empty {
  text-align: center;
  padding: 40px var(--size-spacing-l);
}
.cart-empty i {
  font-size: 48px;
  color: var(--color-grey-300);
  margin-bottom: var(--size-spacing-m);
}
.cart-empty p {
  color: var(--color-text-secondary);
  margin-bottom: var(--size-spacing-l);
}

.cart-items {
  display: flex;
  flex-direction: column;
  gap: var(--size-spacing-m);
}

.cart-item {
  display: flex;
  gap: var(--size-spacing-m);
  padding: var(--size-spacing-m) 0;
  border-bottom: var(--size-border-width-s) solid var(--color-grey-100);
}

.cart-item-image {
  width: 80px;
  height: 80px;
  border-radius: var(--size-border-radius-m);
  overflow: hidden;
}
.cart-item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cart-item-details {
  flex: 1;
}

.cart-item-name {
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--size-spacing-xs);
}

.cart-item-info {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-bottom: var(--size-spacing-s);
}

.cart-item-price {
  font-weight: var(--font-weight-medium);
}

.cart-item-actions {
  display: flex;
  align-items: center;
  gap: var(--size-spacing-s);
  margin-top: var(--size-spacing-s);
}

.quantity-btn {
  width: 24px;
  height: 24px;
  border: var(--size-border-width-s) solid var(--color-grey-200);
  background: var(--color-white);
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xxs);
}
.quantity-btn:hover {
  background-color: var(--color-bg-secondary);
}

.quantity {
  font-weight: var(--font-weight-medium);
  min-width: 20px;
  text-align: center;
}

.remove-btn {
  background: none;
  border: none;
  color: var(--color-text-secondary);
  cursor: pointer;
  font-size: var(--font-size-xxs);
  margin-left: auto;
}
.remove-btn:hover {
  color: var(--color-text-primary);
}

.cart-footer {
  padding: var(--size-spacing-l);
  border-top: var(--size-border-width-s) solid var(--color-grey-100);
}

.cart-total {
  margin-bottom: var(--size-spacing-l);
}

.total-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--size-spacing-s);
  font-size: var(--font-size-xs);
}

.total-final {
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-s);
  padding-top: var(--size-spacing-s);
  border-top: var(--size-border-width-s) solid var(--color-grey-100);
}

/* ==================================================
   6. ANIMATIONS
   ================================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInRight {
  from { transform: translateX(100%); }
  to { transform: translateX(0); }
}

@keyframes slideInLeft {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.slide-in-right {
  animation: slideInRight var(--transition-duration-normal) ease-out;
}

.slide-in-left {
  animation: slideInLeft var(--transition-duration-normal) ease-out;
}

/* ==================================================
   7. UTILITY CLASSES
   ================================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }

.w-full { width: 100%; }
.h-full { height: 100%; }

/* ==================================================
   8. RESPONSIVE DESIGN
   ================================================== */
/* Mobile */
@media (max-width: 768px) {
  .cart-sidebar {
    width: 100%;
    right: -100%;
  }

  .modal {
    width: 95%;
    margin: var(--size-spacing-l);
  }
}/* Small Mobile */
@media (max-width: 480px) {
  .container {
    padding: 0 var(--size-spacing-s);
  }

  .btn {
    padding: var(--button-padding-top-s) var(--button-padding-sides-s);
    font-size: var(--font-size-xs);
  }

  h1 {
    font-size: var(--font-size-xxxl);
  }

  h2 {
    font-size: var(--font-size-xl);
  }
  
  h3 {
    font-size: var(--font-size-m);
  }
}