/* ==========================================================================
   VietLegacy - Components Library
   ========================================================================== */

/* ==========================================================================
   Typography Utilities
   ========================================================================== */

.heading-1 {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-gray-900);
  letter-spacing: var(--tracking-tight);
}

.heading-2 {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  line-height: var(--leading-tight);
  color: var(--color-gray-900);
}

.heading-3 {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-snug);
  color: var(--color-gray-900);
}

.heading-4 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  line-height: var(--leading-snug);
  color: var(--color-gray-800);
}

.body-large {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-gray-600);
}

.body-base {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-gray-600);
}

.body-small {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: var(--color-gray-500);
}

.text-primary {
  color: var(--color-primary);
}

.text-gold {
  color: var(--color-gold);
}

.text-white {
  color: var(--color-white);
}

.text-center {
  text-align: center;
}

@media (min-width: 1024px) {
  .heading-1 {
    font-size: var(--text-5xl);
  }

  .heading-2 {
    font-size: var(--text-4xl);
  }

  .heading-3 {
    font-size: var(--text-3xl);
  }
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  line-height: var(--leading-normal);
  text-decoration: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  border: var(--border-width-2) solid transparent;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Primary Button */
.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--primary:active {
  transform: translateY(0);
}

/* Secondary Button (Outline) */
.btn--secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* White Button (For dark backgrounds) */
.btn--white {
  background-color: var(--color-white);
  color: var(--color-primary);
  border-color: var(--color-white);
}

.btn--white:hover {
  background-color: var(--color-gray-100);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Ghost Button */
.btn--ghost {
  background-color: transparent;
  color: var(--color-gray-700);
  border-color: transparent;
}

.btn--ghost:hover {
  background-color: var(--color-gray-100);
  color: var(--color-gray-900);
}

/* Button Sizes */
.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.btn--lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-lg);
}

/* Button with Icon */
.btn__icon {
  width: 1.25em;
  height: 1.25em;
}

/* Disabled State */
.btn:disabled,
.btn--disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background-color: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.card__content {
  padding: var(--space-6);
}

.card__header {
  margin-bottom: var(--space-4);
}

.card__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-2);
}

.card__subtitle {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

.card__body {
  color: var(--color-gray-600);
  margin-bottom: var(--space-4);
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-gray-200);
}

/* Product Card */
.card--product {
  text-align: center;
}

.card--product .card__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-4);
  color: var(--color-primary);
}

.card--product .card__price {
  font-size: var(--text-lg);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-2);
}

.card--product .card__timeline {
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

/* Feature Card */
.card--feature {
  padding: var(--space-6);
  text-align: center;
}

.card--feature .card__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  color: var(--color-primary);
}

/* ==========================================================================
   Badges
   ========================================================================== */

.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.badge--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.badge--secondary {
  background-color: var(--color-gray-100);
  color: var(--color-gray-700);
}

.badge--gold {
  background-color: var(--color-gold);
  color: var(--color-gray-900);
}

.badge--success {
  background-color: var(--color-success);
  color: var(--color-white);
}

/* ==========================================================================
   Forms
   ========================================================================== */

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-gray-700);
}

.form-label--required::after {
  content: " *";
  color: var(--color-error);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-base);
  color: var(--color-gray-900);
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-gray-300);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(196, 30, 58, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-gray-400);
}

.form-input--error,
.form-textarea--error,
.form-select--error {
  border-color: var(--color-error);
}

.form-input--error:focus,
.form-textarea--error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%236B7280' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-10);
}

.form-error {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-error);
}

.form-hint {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-gray-500);
}

/* Checkbox & Radio */
.form-checkbox,
.form-radio {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  cursor: pointer;
}

.form-checkbox input,
.form-radio input {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  margin-top: 0.125rem;
  accent-color: var(--color-primary);
}

.form-checkbox__label,
.form-radio__label {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
}

/* ==========================================================================
   Lists
   ========================================================================== */

.list {
  list-style: none;
}

.list--check .list__item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.list--check .list__icon {
  flex-shrink: 0;
  width: 1.25rem;
  height: 1.25rem;
  color: var(--color-success);
}

/* ==========================================================================
   Accordion
   ========================================================================== */

.accordion {
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.accordion__item {
  border-bottom: 1px solid var(--color-gray-200);
}

.accordion__item:last-child {
  border-bottom: none;
}

.accordion__header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  text-align: left;
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  color: var(--color-gray-900);
  background-color: var(--color-white);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.accordion__header:hover {
  background-color: var(--color-gray-50);
}

.accordion__icon {
  width: 1.25rem;
  height: 1.25rem;
  color: var(--color-gray-500);
  transition: transform var(--transition-base);
}

.accordion__item--active .accordion__icon {
  transform: rotate(180deg);
}

.accordion__content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base);
}

.accordion__item--active .accordion__content {
  max-height: 500px;
}

.accordion__body {
  padding: 0 var(--space-5) var(--space-4);
  color: var(--color-gray-600);
}

/* ==========================================================================
   Stats
   ========================================================================== */

.stat {
  text-align: center;
}

.stat__value {
  font-family: var(--font-heading);
  font-size: var(--text-4xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  line-height: var(--leading-none);
  margin-bottom: var(--space-2);
}

.stat__label {
  font-size: var(--text-sm);
  color: var(--color-gray-600);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

@media (min-width: 1024px) {
  .stat__value {
    font-size: var(--text-5xl);
  }
}

/* ==========================================================================
   Section Utilities
   ========================================================================== */

.section {
  padding: var(--space-16) 0;
}

.section--sm {
  padding: var(--space-12) 0;
}

.section--lg {
  padding: var(--space-20) 0;
}

.section--gray {
  background-color: var(--color-gray-50);
}

.section--dark {
  background-color: var(--color-gray-900);
  color: var(--color-white);
}

.section--primary {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
}

.section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-12);
}

.section__title {
  font-family: var(--font-heading);
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--space-4);
}

.section--dark .section__title,
.section--primary .section__title {
  color: var(--color-white);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--color-gray-600);
}

.section--dark .section__subtitle,
.section--primary .section__subtitle {
  color: rgba(255, 255, 255, 0.8);
}

@media (min-width: 1024px) {
  .section {
    padding: var(--space-20) 0;
  }

  .section--lg {
    padding: var(--space-24) 0;
  }

  .section__title {
    font-size: var(--text-4xl);
  }
}

/* ==========================================================================
   Container
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-8);
  }
}

/* ==========================================================================
   Grid
   ========================================================================== */

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--2 {
  grid-template-columns: repeat(1, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(1, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(1, 1fr);
}

@media (min-width: 640px) {
  .grid--2,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .grid--3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(4, 1fr);
  }

  .grid {
    gap: var(--space-8);
  }
}

/* ==========================================================================
   Divider
   ========================================================================== */

.divider {
  border: none;
  border-top: 1px solid var(--color-gray-200);
  margin: var(--space-8) 0;
}

/* ==========================================================================
   Link Styles
   ========================================================================== */

.link {
  color: var(--color-primary);
  text-decoration: none;
  position: relative;
  transition: color var(--transition-fast);
}

.link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.link:hover::after {
  width: 100%;
}

.link:hover {
  color: var(--color-primary-dark);
}

/* ==========================================================================
   Logo Styles
   ========================================================================== */

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
}

.logo__image {
  height: 40px;
  width: auto;
}

.logo__text {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-gray-900);
}

.logo__text--white {
  color: var(--color-white);
}

/* ==========================================================================
   Client Logos
   ========================================================================== */

.client-logos {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
}

.client-logos__item {
  filter: grayscale(100%);
  opacity: 0.6;
  transition: all var(--transition-base);
}

.client-logos__item:hover {
  filter: grayscale(0%);
  opacity: 1;
}

.client-logos__item img {
  height: 40px;
  width: auto;
}

@media (min-width: 768px) {
  .client-logos__item img {
    height: 48px;
  }
}

/* ==========================================================================
   Responsive Visibility
   ========================================================================== */

.hide-mobile {
  display: none;
}

.show-mobile {
  display: block;
}

@media (min-width: 768px) {
  .hide-mobile {
    display: block;
  }

  .show-mobile {
    display: none;
  }
}

/* ==========================================================================
   Animation Classes
   ========================================================================== */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.fade-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* Stagger delay classes */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }