@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Be+Vietnam+Pro:wght@400;500;600;700;800&display=swap');

/* ==========================================================================
   BIẾN CSS TÙY CHỈNH (VARIABLES)
   ========================================================================== */
:root {
  /* Bảng màu chính - Tiffany Fresh */
  --clr-primary: #C59D5F;
  --clr-primary-dark: #9E7B46;
  --clr-accent: #D2B48C;
  --clr-accent-dark: #B8966E;
  --clr-bg-main: #FAFAFA;
  --clr-bg-alt: #FDF5E6;
  --clr-bg-tertiary: #F5EFEB;
  
  /* Bảng màu văn bản */
  --clr-text-primary: #2D2D2D;
  --clr-text-secondary: #6B7280;
  --clr-text-light: #9CA3AF;
  
  /* Màu viền và nền thành phần */
  --clr-border: #E5E7EB;
  --clr-card-bg: #FFFFFF;
  
  /* Đổ bóng */
  --shadow-light: 0 4px 20px rgba(197, 157, 95, 0.15);
  --shadow-hover: 0 10px 30px rgba(197, 157, 95, 0.25);
  --shadow-nav: 0 4px 12px rgba(0, 0, 0, 0.05);
  
  /* Phông chữ */
  --font-heading: 'Be Vietnam Pro', sans-serif;
  --font-body: 'Inter', sans-serif;
  
  /* Chuyển động */
  --transition: all 0.3s ease;
}

/* ==========================================================================
   KHỞI TẠO & CÀI ĐẶT CHUNG (RESET & GLOBAL)
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  color: var(--clr-text-primary);
  background-color: var(--clr-bg-main);
  line-height: 1.6;
  overflow-x: hidden;
}

/* Container chính */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Các section */
section {
  padding: 100px 0;
  position: relative;
}

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

/* Tiêu đề & Căn chỉnh */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--clr-text-primary);
}

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

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

/* Header cho các section */
.section-header {
  text-align: center;
  margin-bottom: 50px;
}

.section-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--clr-primary);
  background-color: var(--clr-bg-tertiary);
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--clr-text-secondary);
  max-width: 600px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* Nút bấm (Buttons) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 50px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  outline: none;
}

.btn-primary {
  background-color: var(--clr-accent);
  color: white;
}

.btn-primary:hover {
  background-color: var(--clr-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 15px rgba(255, 107, 129, 0.3);
}

.btn-secondary {
  background-color: transparent;
  color: var(--clr-primary);
  border: 2px solid var(--clr-primary);
}

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

.btn-cta-nav {
  background-color: var(--clr-accent);
  color: white;
  padding: 10px 24px;
  font-size: 0.95rem;
}

.btn-cta-nav:hover {
  background-color: var(--clr-accent-dark);
}

.btn-outline {
  background-color: transparent;
  color: var(--clr-text-primary);
  border: 2px solid var(--clr-border);
}

.btn-outline:hover {
  border-color: var(--clr-primary);
  color: var(--clr-primary);
}

/* ==========================================================================
   HEADER / THANH ĐIỀU HƯỚNG (.navbar)
   ========================================================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: transparent;
  transition: var(--transition);
  padding: 15px 0;
}

.navbar--scrolled {
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-nav);
  padding: 10px 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 50px;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--clr-text-primary);
  text-decoration: none;
}

.logo span {
  color: var(--clr-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--clr-text-primary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: var(--transition);
}

.nav-links a:hover {
  color: var(--clr-primary);
}

/* Nút mở menu trên mobile */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 20px;
  cursor: pointer;
  z-index: 1001;
  background: transparent;
  border: none;
}

.hamburger-line {
  display: block;
  width: 100%;
  height: 3px;
  background-color: var(--clr-text-primary);
  border-radius: 3px;
  transition: var(--transition);
}

/* Hiệu ứng X khi menu mở */
.menu-toggle--active .hamburger-line:nth-child(1) {
  transform: translateY(8.5px) rotate(45deg);
}

.menu-toggle--active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.menu-toggle--active .hamburger-line:nth-child(3) {
  transform: translateY(-8.5px) rotate(-45deg);
}

.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.mobile-menu-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* ==========================================================================
   HERO SECTION (.hero)
   ========================================================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  background: linear-gradient(to bottom, #FFFFFF 0%, var(--clr-bg-tertiary) 100%);
  position: relative;
  overflow: hidden;
}

.hero-container {
  display: flex;
  align-items: center;
  gap: 40px;
  position: relative;
  z-index: 2;
}

.hero-content {
  flex: 0 0 60%;
}

.hero-greeting {
  display: inline-block;
  color: var(--clr-text-secondary);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: 8px;
}

.hero-name {
  font-size: 4rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 10px;
  color: var(--clr-text-primary);
}

.hero-role {
  font-size: 2rem;
  font-weight: 600;
  color: var(--clr-primary);
  min-height: 48px;
}

.typing-text {
  display: inline;
}

.typing-cursor {
  color: var(--clr-accent);
  animation: blink 1s step-end infinite;
}

.hero-tagline {
  color: var(--clr-text-secondary);
  font-size: 1.1rem;
  max-width: 500px;
  margin: 20px 0 30px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 24px;
}

.hero-socials {
  display: flex;
  gap: 16px;
  margin-top: 32px;
}

.hero-socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background-color: white;
  color: var(--clr-text-secondary);
  font-size: 1.4rem;
  text-decoration: none;
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

.hero-socials a:hover {
  background-color: var(--clr-primary);
  color: white;
  transform: translateY(-3px);
}

.hero-image {
  flex: 0 0 40%;
  display: flex;
  justify-content: center;
  position: relative;
}

.hero-image-wrapper {
  position: relative;
  width: 350px;
  aspect-ratio: 1;
  z-index: 2;
}

.hero-image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  position: relative;
  z-index: 2;
  border: 8px solid white;
  box-shadow: var(--shadow-light);
}

.hero-image-ring {
  position: absolute;
  inset: -12px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--clr-primary), var(--clr-accent));
  z-index: 1;
  animation: rotateRing 15s linear infinite;
  opacity: 0.8;
}

.hero-image-ring::after {
  content: '';
  position: absolute;
  inset: 4px;
  background-color: var(--clr-bg-main);
  border-radius: 50%;
}

/* Trang trí nền (Decorations) */
.hero-decoration {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  z-index: 0;
  opacity: 0.5;
}

.hero-decoration--1 {
  width: 400px;
  height: 400px;
  background-color: rgba(10, 186, 181, 0.3); /* Tiffany */
  top: -100px;
  right: -100px;
}

.hero-decoration--2 {
  width: 300px;
  height: 300px;
  background-color: rgba(255, 107, 129, 0.2); /* Coral Pink */
  bottom: 50px;
  left: -50px;
}

/* ==========================================================================
   ABOUT SECTION (.about)
   ========================================================================== */
.about {
  background-color: var(--clr-bg-alt);
}

.about-grid {
  display: flex;
  align-items: center;
  gap: 60px;
}

.about-media {
  flex: 0 0 40%;
}

.about-image-wrapper {
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-hover);
  position: relative;
}

.about-image-wrapper::before {
  content: '';
  display: block;
  padding-top: 120%; /* Tỉ lệ dọc */
}

.about-image-wrapper img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-content {
  flex: 0 0 60%;
}

.about-heading {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: 20px;
}

.about-text {
  color: var(--clr-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
  font-size: 1.05rem;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin: 32px 0;
}

.stat-item {
  background-color: white;
  padding: 20px 15px;
  border-radius: 12px;
  text-align: center;
  box-shadow: var(--shadow-light);
  transition: var(--transition);
}

.stat-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--clr-primary);
  line-height: 1;
}

.stat-suffix {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  color: var(--clr-primary);
  font-weight: 700;
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  margin-top: 8px;
  font-weight: 500;
}

.about-skills {
  margin-top: 24px;
}

.skills-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.skills-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.skill-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 50px;
  border: 1.5px solid var(--clr-primary);
  color: var(--clr-primary);
  font-size: 0.9rem;
  font-weight: 500;
  background-color: white;
  transition: var(--transition);
}

.skill-tag:hover {
  background-color: var(--clr-primary);
  color: white;
}

/* ==========================================================================
   PORTFOLIO SECTION (.portfolio)
   ========================================================================== */
.portfolio {
  background-color: var(--clr-bg-main);
}

.portfolio-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 10px 24px;
  border-radius: 50px;
  border: 2px solid var(--clr-border);
  background-color: transparent;
  color: var(--clr-text-secondary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  background-color: var(--clr-primary);
  color: white;
  border-color: var(--clr-primary);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}

.portfolio-card {
  background-color: var(--clr-card-bg);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-light);
  transition: all 0.4s ease;
}

.portfolio-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
}

.portfolio-card[data-hidden="true"],
.portfolio-card.hidden {
  display: none;
}

.portfolio-thumbnail {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
}

.portfolio-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.portfolio-card:hover .portfolio-thumbnail img {
  transform: scale(1.08);
}

.portfolio-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(10, 186, 181, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: var(--transition);
}

.portfolio-card:hover .portfolio-overlay {
  opacity: 1;
}

.btn-view-detail {
  background-color: transparent;
  color: white;
  border: 2px solid white;
  padding: 10px 24px;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  transition: var(--transition);
}

.btn-view-detail:hover {
  background-color: white;
  color: var(--clr-primary);
}

.portfolio-info {
  padding: 24px;
}

.portfolio-category {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--clr-primary);
  background-color: var(--clr-bg-tertiary);
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 12px;
}

.portfolio-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.portfolio-desc {
  font-size: 0.95rem;
  color: var(--clr-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.portfolio-link {
  background: none;
  border: none;
  color: var(--clr-accent);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  padding: 0;
  transition: var(--transition);
}

.portfolio-link:hover {
  gap: 12px;
}

/* ==========================================================================
   MODALS (HỘP THOẠI)
   ========================================================================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal--open {
  opacity: 1;
  visibility: visible;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background-color: white;
  border-radius: 20px;
  max-width: 900px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  z-index: 1;
  transform: scale(0.95);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal--open .modal-content {
  transform: scale(1);
  opacity: 1;
}

/* Tùy chỉnh thanh cuộn cho modal */
.modal-content::-webkit-scrollbar {
  width: 8px;
}
.modal-content::-webkit-scrollbar-track {
  background: #f1f1f1;
  border-radius: 10px;
}
.modal-content::-webkit-scrollbar-thumb {
  background: var(--clr-text-light);
  border-radius: 10px;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: #f3f4f6;
  border: none;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 10;
  color: var(--clr-text-primary);
  transition: var(--transition);
}

.modal-close:hover {
  background-color: var(--clr-accent);
  color: white;
  transform: rotate(90deg);
}

.modal-body {
  display: grid;
  grid-template-columns: 45% 55%;
}

.modal-media {
  height: 100%;
  min-height: 300px;
}

.modal-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-top-left-radius: 20px;
  border-bottom-left-radius: 20px;
}

.modal-info {
  padding: 40px;
}

.modal-section {
  margin-bottom: 24px;
}

.modal-section h4 {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.modal-section h4 i {
  color: var(--clr-primary);
}

.modal-section:first-child h4 i {
  color: var(--clr-accent); /* Icon cho vấn đề/thách thức */
}

.modal-section p {
  color: var(--clr-text-secondary);
  line-height: 1.7;
}

.modal-results {
  list-style: none;
}

.modal-results li {
  padding: 10px 0;
  border-bottom: 1px solid var(--clr-border);
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.modal-results li:last-child {
  border-bottom: none;
}

.modal-results li i {
  color: var(--clr-primary);
  margin-top: 4px;
}

.modal-results li strong {
  color: var(--clr-primary);
}

/* ==========================================================================
   SERVICES (.services) & WORKFLOW (.workflow)
   ========================================================================== */
.services {
  background-color: var(--clr-bg-tertiary);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.service-card {
  background-color: white;
  border-radius: 16px;
  padding: 40px 30px;
  text-align: center;
  box-shadow: var(--shadow-light);
  border: 2px solid transparent;
  transition: var(--transition);
}

.service-card:hover {
  transform: translateY(-8px);
  border-color: var(--clr-primary);
  box-shadow: 0 10px 30px rgba(197, 157, 95, 0.25);
}

.service-icon {
  width: 70px;
  height: 70px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--clr-bg-tertiary), #d1f7f2);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 2rem;
  color: var(--clr-primary);
}

.service-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.service-desc {
  font-size: 0.95rem;
  color: var(--clr-text-secondary);
  margin-bottom: 24px;
  line-height: 1.7;
}

.service-checklist {
  list-style: none;
  text-align: left;
  border-top: 1px solid var(--clr-border);
  padding-top: 20px;
}

.service-checklist li {
  padding: 8px 0;
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.service-checklist li i {
  color: var(--clr-primary);
  font-size: 0.8rem;
  margin-top: 5px;
}

.service-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--clr-accent);
  font-weight: 600;
  text-decoration: none;
  margin-top: 24px;
  transition: var(--transition);
  font-size: 0.95rem;
}

.service-cta:hover {
  gap: 12px;
}

/* Quy trình làm việc (Workflow) */
.workflow {
  margin-top: 80px;
  text-align: center;
}

.workflow-title {
  font-size: 1.8rem;
  margin-bottom: 50px;
}

.workflow-steps {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 10px;
}

.workflow-step {
  flex: 1;
  max-width: 250px;
  text-align: center;
  position: relative;
}

.step-number {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--clr-primary);
  background: var(--clr-bg-tertiary);
  padding: 4px 12px;
  border-radius: 50px;
  display: inline-block;
  margin-bottom: 12px;
}

.step-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background-color: var(--clr-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.5rem;
  box-shadow: 0 4px 15px rgba(10, 186, 181, 0.3);
}

.workflow-step h4 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.workflow-step p {
  font-size: 0.9rem;
  color: var(--clr-text-secondary);
}

.workflow-connector {
  display: flex;
  align-items: center;
  color: var(--clr-primary);
  font-size: 1.2rem;
  padding: 0 10px;
  margin-top: 35px;
  opacity: 0.5;
}

/* ==========================================================================
   CONTACT SECTION (.contact)
   ========================================================================== */
.contact {
  background-color: var(--clr-bg-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: 45% 55%;
  gap: 60px;
  align-items: start;
}

.contact-heading {
  font-size: 1.8rem;
  margin-bottom: 16px;
}

.contact-text {
  color: var(--clr-text-secondary);
  margin-bottom: 40px;
  font-size: 1.05rem;
}

.contact-details {
  margin-bottom: 40px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
}

.contact-icon {
  width: 50px;
  height: 50px;
  border-radius: 12px;
  background-color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-primary);
  font-size: 1.2rem;
  box-shadow: var(--shadow-light);
}

.contact-label {
  display: block;
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  margin-bottom: 4px;
}

.contact-item a, 
.contact-item span {
  color: var(--clr-text-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 1.05rem;
  transition: var(--transition);
}

.contact-item a:hover {
  color: var(--clr-primary);
}

.contact-socials {
  display: flex;
  gap: 15px;
  margin-bottom: 40px;
}

.social-link {
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background-color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-text-secondary);
  font-size: 1.2rem;
  box-shadow: var(--shadow-light);
  text-decoration: none;
  transition: var(--transition);
}

.social-link:hover {
  background-color: var(--clr-primary);
  color: white;
  transform: translateY(-3px);
}

.contact-alt {
  padding-top: 30px;
  border-top: 1px solid rgba(0,0,0,0.05);
}

.contact-alt p {
  font-size: 0.95rem;
  color: var(--clr-text-secondary);
  margin-bottom: 16px;
  font-weight: 500;
}

.contact-alt-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-messenger {
  background-color: #0084FF;
  color: white;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.btn-messenger:hover {
  background-color: #0073e6;
  transform: translateY(-2px);
}

.btn-zalo {
  background-color: #0068FF;
  color: white;
  text-decoration: none;
  padding: 10px 24px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}

.btn-zalo:hover {
  background-color: #005ce6;
  transform: translateY(-2px);
}

/* Form liên hệ */
.contact-form-wrapper {
  background-color: white;
  border-radius: 20px;
  padding: 40px;
  box-shadow: var(--shadow-light);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--clr-text-primary);
}

.required {
  color: var(--clr-accent);
}

.form-group input, 
.form-group select, 
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  border-radius: 12px;
  border: 1.5px solid var(--clr-border);
  font-family: var(--font-body);
  font-size: 1rem;
  background-color: #fafafa;
  transition: var(--transition);
  color: var(--clr-text-primary);
}

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

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
  border-color: var(--clr-primary);
  outline: none;
  background-color: white;
  box-shadow: 0 0 0 4px rgba(197, 157, 95, 0.15);
}

.btn-submit {
  width: 100%;
  padding: 16px;
  font-size: 1.05rem;
  margin-top: 10px;
}

/* ==========================================================================
   FOOTER (.footer)
   ========================================================================== */
.footer {
  background-color: var(--clr-text-primary);
  color: white;
  padding-top: 80px;
}

.footer-container {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 60px;
}

.footer-brand .logo {
  color: white;
}

.footer-brand .logo span {
  color: var(--clr-primary);
}

.footer-tagline {
  color: var(--clr-text-light);
  font-size: 0.95rem;
  margin-top: 16px;
  line-height: 1.7;
  max-width: 300px;
}

.footer-links h4, 
.footer-social h4 {
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: white;
}

.footer-links nav {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--clr-text-light);
  text-decoration: none;
  transition: var(--transition);
  font-size: 0.95rem;
  display: inline-block;
}

.footer-links a:hover {
  color: var(--clr-primary);
  transform: translateX(5px);
}

.footer-social-icons {
  display: flex;
  gap: 12px;
}

.footer-social-icons a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-text-light);
  text-decoration: none;
  transition: var(--transition);
}

.footer-social-icons a:hover {
  background-color: var(--clr-primary);
  color: white;
  transform: translateY(-3px);
}

.footer-bottom {
  margin-top: 60px;
  padding: 24px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.9rem;
  color: var(--clr-text-light);
}

/* ==========================================================================
   BACK TO TOP BUTTON (.back-to-top)
   ========================================================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: var(--clr-primary);
  color: white;
  border: none;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(10, 186, 181, 0.4);
}

.back-to-top--visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background-color: var(--clr-primary-dark);
  transform: translateY(-5px);
}

/* ==========================================================================
   HIỆU ỨNG CHUYỂN ĐỘNG (ANIMATIONS)
   ========================================================================== */
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleUp {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes rotateRing {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Class cho JS scroll animation */
[data-animate] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.animated {
  opacity: 1 !important;
  transform: translateY(0) !important;
}

/* ==========================================================================
   RESPONSIVE (MEDIA QUERIES)
   ========================================================================== */
/* Tablet ngang & Màn hình nhỏ (max-width: 1024px) */
@media (max-width: 1024px) {
  .hero-name {
    font-size: 3.2rem;
  }
  
  .about-grid,
  .contact-grid {
    gap: 40px;
  }
  
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .portfolio-grid {
    gap: 20px;
  }
  
  .modal-body {
    grid-template-columns: 40% 60%;
  }
}

/* Tablet dọc & Mobile ngang (max-width: 768px) */
@media (max-width: 768px) {
  section {
    padding: 80px 0;
  }
  
  /* Navbar / Mobile menu */
  .menu-toggle {
    display: flex;
  }
  
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background-color: white;
    flex-direction: column;
    align-items: flex-start;
    padding: 80px 30px 40px;
    transition: right 0.4s ease;
    z-index: 1000;
    box-shadow: -5px 0 15px rgba(0,0,0,0.05);
  }
  
  .nav-links.nav-links--open {
    right: 0;
  }
  
  .nav-links a {
    font-size: 1.1rem;
    padding: 10px 0;
    display: block;
    width: 100%;
    border-bottom: 1px solid var(--clr-border);
  }
  
  .btn-cta-nav {
    margin-top: 20px;
    width: 100%;
    text-align: center;
  }
  
  /* Hero */
  .hero {
    padding-top: 100px;
  }
  
  .hero-container {
    flex-direction: column-reverse;
    text-align: center;
  }
  
  .hero-content, .hero-image {
    flex: 0 0 100%;
  }
  
  .hero-tagline {
    margin: 20px auto;
  }
  
  .hero-actions, .hero-socials {
    justify-content: center;
  }
  
  /* About */
  .about-grid {
    flex-direction: column;
  }
  
  .about-media, .about-content {
    flex: 0 0 100%;
    width: 100%;
  }
  
  .about-image-wrapper {
    max-width: 400px;
    margin: 0 auto;
  }
  
  /* Portfolio */
  .portfolio-grid {
    grid-template-columns: 1fr;
  }
  
  /* Modal */
  .modal-body {
    grid-template-columns: 1fr;
  }
  
  .modal-media {
    min-height: 250px;
  }
  
  .modal-media img {
    border-radius: 20px 20px 0 0;
  }
  
  /* Contact */
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  /* Footer */
  .footer-container {
    grid-template-columns: 1fr;
    gap: 40px;
    text-align: center;
  }
  
  .footer-tagline {
    margin: 16px auto 0;
  }
  
  .footer-social-icons {
    justify-content: center;
  }
}

/* Mobile dọc (max-width: 480px) */
@media (max-width: 480px) {
  .section-title {
    font-size: 2rem;
  }
  
  .hero-name {
    font-size: 2.5rem;
  }
  
  .hero-role {
    font-size: 1.5rem;
  }
  
  .hero-actions {
    flex-wrap: wrap;
  }
  
  .hero-actions .btn {
    width: 100%;
  }
  
  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .services-grid {
    grid-template-columns: 1fr;
  }
  
  .workflow-steps {
    flex-direction: column;
    align-items: center;
    gap: 40px;
  }
  
  .workflow-connector {
    display: none;
  }
  
  .contact-form-wrapper {
    padding: 24px;
  }
}