/* ===================================================
   VBC - Viet Business Consulting
   Vietnamese-market adapted theme: Red & Gold palette
   =================================================== */

/* --- CSS Variables --- */
:root {
  /* Primary: Deep Red (Vietnamese lucky color) */
  --primary: #C41E3A;
  --primary-dark: #9B1B30;
  --primary-light: #E85D75;

  /* Accent: Gold (prosperity) */
  --accent: #D4A843;
  --accent-dark: #B8922E;
  --accent-light: #F0D080;

  /* Neutrals */
  --dark: #1A1A2E;
  --dark-600: #2D2D44;
  --gray-700: #374151;
  --gray-500: #6B7280;
  --gray-300: #D1D5DB;
  --gray-100: #F3F4F6;
  --white: #FFFFFF;

  /* Backgrounds */
  --bg-light: #FDF8F0;
  --bg-section: #FAF5EE;
  --bg-dark: #1A1A2E;

  /* Typography */
  --font: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Sizing */
  --container: 1200px;
  --header-h: 80px;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);

  /* Transitions */
  --transition: 0.3s ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-h);
}

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  color: var(--gray-700);
  background: var(--white);
  overflow-x: hidden;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

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

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: 100px 0;
}

/* --- Text Utilities --- */
.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

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

/* --- Section Header --- */
.section__header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 60px;
}

.section__tag {
  display: inline-block;
  background: linear-gradient(135deg, rgba(196,30,58,0.1), rgba(212,168,67,0.1));
  color: var(--primary);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 20px;
  border-radius: 50px;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.section__title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.2;
  margin-bottom: 20px;
}

.section__subtitle {
  font-size: 1.1rem;
  color: var(--gray-500);
  line-height: 1.8;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  border-color: var(--primary);
}

.btn--primary:hover {
  background: linear-gradient(135deg, var(--primary-dark), #7A1525);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(196,30,58,0.3);
}

.btn--outline {
  background: transparent;
  color: var(--dark);
  border-color: var(--gray-300);
}

.btn--outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn--light {
  background: var(--white);
  color: var(--primary);
  border-color: var(--white);
}

.btn--light:hover {
  background: var(--bg-light);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(255,255,255,0.3);
}

.btn--large {
  padding: 18px 40px;
  font-size: 1.1rem;
}

.btn--full {
  width: 100%;
  justify-content: center;
}

/* ===========================
   HEADER / NAVIGATION
   =========================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-h);
  z-index: 1000;
  transition: var(--transition);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
  height: 70px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  transition: var(--transition);
}

.header--scrolled .nav {
  height: 70px;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-vbc {
  font-size: 1.8rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -1px;
}

.logo-text {
  font-size: 0.75rem;
  color: var(--gray-500);
  font-weight: 500;
  line-height: 1.3;
  border-left: 2px solid var(--gray-300);
  padding-left: 12px;
}

.nav__menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  padding: 8px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--gray-700);
  border-radius: var(--radius-sm);
}

.nav__link:hover,
.nav__link.active {
  color: var(--primary);
}

.nav__link--cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white) !important;
  padding: 10px 24px;
}

.nav__link--cta:hover {
  box-shadow: 0 4px 15px rgba(196,30,58,0.3);
  transform: translateY(-1px);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--dark);
  cursor: pointer;
}

/* ===========================
   HERO
   =========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(160deg, var(--bg-light) 0%, #FFF5F5 40%, var(--bg-section) 100%);
  padding-top: var(--header-h);
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -200px;
  right: -200px;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(196,30,58,0.06) 0%, transparent 70%);
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  left: -100px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(212,168,67,0.08) 0%, transparent 70%);
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 750px;
  padding: 60px 0;
}

.hero__badge {
  display: inline-block;
  background: linear-gradient(135deg, rgba(196,30,58,0.08), rgba(212,168,67,0.08));
  border: 1px solid rgba(196,30,58,0.15);
  color: var(--primary);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 20px;
  border-radius: 50px;
  margin-bottom: 24px;
  letter-spacing: 0.5px;
}

.hero__title {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1.15;
  margin-bottom: 24px;
}

.hero__description {
  font-size: 1.15rem;
  color: var(--gray-500);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 600px;
}

.hero__description strong {
  color: var(--primary);
  font-weight: 600;
}

.hero__actions {
  display: flex;
  gap: 16px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.hero__stats {
  display: flex;
  gap: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(0,0,0,0.06);
}

.hero__stat {
  text-align: left;
}

.hero__stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--dark);
  line-height: 1;
}

.hero__stat-plus {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--primary);
}

.hero__stat-label {
  display: block;
  font-size: 0.9rem;
  color: var(--gray-500);
  margin-top: 4px;
}

.hero__scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.hero__scroll a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 2px solid var(--gray-300);
  color: var(--gray-500);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-8px); }
  60% { transform: translateY(-4px); }
}

/* ===========================
   ABOUT
   =========================== */
.about {
  background: var(--white);
}

.about__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.about__card {
  background: var(--white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
}

.about__card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.about__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(196,30,58,0.08), rgba(212,168,67,0.08));
  color: var(--primary);
  font-size: 1.6rem;
  margin-bottom: 20px;
}

.about__card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.about__card p {
  font-size: 0.95rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ===========================
   12-STEP SYSTEM
   =========================== */
.system {
  background: var(--bg-section);
}

.steps {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.steps__timeline {
  position: absolute;
  left: 38px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--primary), var(--accent));
  border-radius: 3px;
}

.step {
  display: flex;
  gap: 28px;
  margin-bottom: 20px;
  position: relative;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.step.visible {
  opacity: 1;
  transform: translateY(0);
}

.step__number {
  flex-shrink: 0;
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  font-size: 1.3rem;
  font-weight: 800;
  border-radius: 50%;
  position: relative;
  z-index: 2;
  box-shadow: 0 4px 15px rgba(196,30,58,0.25);
}

.step:nth-child(even) .step__number {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  box-shadow: 0 4px 15px rgba(212,168,67,0.25);
}

.step__content {
  flex: 1;
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px 28px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.04);
  transition: var(--transition);
}

.step__content:hover {
  box-shadow: var(--shadow-md);
  transform: translateX(4px);
}

.step__phase {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--primary);
  margin-bottom: 6px;
}

.step__content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}

.step__content p {
  font-size: 0.95rem;
  color: var(--gray-500);
  line-height: 1.7;
}

/* Tab Switcher */
.system__tabs {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
}

.system__tab {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 32px;
  border-radius: var(--radius);
  border: 2px solid var(--gray-300);
  background: var(--white);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font);
  text-align: left;
  min-width: 280px;
}

.system__tab:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.system__tab--active {
  border-color: var(--primary);
  background: linear-gradient(135deg, rgba(196,30,58,0.04), rgba(212,168,67,0.04));
  box-shadow: 0 4px 15px rgba(196,30,58,0.12);
}

.system__tab i {
  font-size: 1.5rem;
  color: var(--gray-500);
  transition: var(--transition);
}

.system__tab--active i {
  color: var(--primary);
}

.system__tab-label {
  display: block;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--dark);
  letter-spacing: 0.5px;
}

.system__tab-desc {
  display: block;
  font-size: 0.8rem;
  color: var(--gray-500);
  font-weight: 400;
  margin-top: 2px;
}

/* Tab Panels */
.system__panel {
  display: none;
}

.system__panel--active {
  display: block;
}

/* B2C step number variant */
.step__number--b2c {
  background: linear-gradient(135deg, var(--accent), var(--accent-dark)) !important;
  box-shadow: 0 4px 15px rgba(212,168,67,0.25) !important;
}

.step:nth-child(even) .step__number--b2c {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark)) !important;
  box-shadow: 0 4px 15px rgba(196,30,58,0.25) !important;
}

.steps__timeline--b2c {
  background: linear-gradient(to bottom, var(--accent), var(--primary)) !important;
}

.system__cta {
  text-align: center;
  margin-top: 50px;
}

/* ===========================
   SERVICES
   =========================== */
.services {
  background: var(--white);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}

.service__card {
  position: relative;
  background: var(--white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  transition: var(--transition);
}

.service__card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.service__card--featured {
  border: 2px solid var(--primary);
  background: linear-gradient(135deg, rgba(196,30,58,0.02), rgba(212,168,67,0.02));
}

.service__badge {
  position: absolute;
  top: -1px;
  right: 28px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 6px 16px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.service__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(196,30,58,0.08), rgba(212,168,67,0.08));
  color: var(--primary);
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.service__card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
}

.service__card > p {
  font-size: 0.95rem;
  color: var(--gray-500);
  margin-bottom: 20px;
  line-height: 1.7;
}

.service__features {
  margin-bottom: 24px;
}

.service__features li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-size: 0.95rem;
  color: var(--gray-700);
}

.service__features li i {
  color: var(--accent);
  font-size: 0.8rem;
}

/* ===========================
   TESTIMONIALS
   =========================== */
.testimonials {
  background: var(--bg-section);
}

.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
  margin-bottom: 60px;
}

.testimonial__card {
  background: var(--white);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0,0,0,0.04);
  transition: var(--transition);
}

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

.testimonial__stars {
  color: var(--accent);
  font-size: 0.9rem;
  margin-bottom: 16px;
  display: flex;
  gap: 2px;
}

.testimonial__text {
  font-size: 0.95rem;
  color: var(--gray-700);
  line-height: 1.8;
  margin-bottom: 24px;
  font-style: italic;
}

.testimonial__author {
  display: flex;
  align-items: center;
  gap: 14px;
}

.testimonial__avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
}

.testimonial__author strong {
  display: block;
  font-size: 0.95rem;
  color: var(--dark);
}

.testimonial__author span {
  font-size: 0.8rem;
  color: var(--gray-500);
}

/* Clients */
.clients {
  text-align: center;
}

.clients__label {
  font-size: 0.9rem;
  color: var(--gray-500);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 500;
}

.clients__logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
}

.client__logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-300);
  padding: 12px 20px;
  border: 1px solid var(--gray-100);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  letter-spacing: 0.5px;
}

.client__logo:hover {
  color: var(--gray-500);
  border-color: var(--gray-300);
}

/* ===========================
   CONTACT
   =========================== */
.contact {
  background: var(--white);
}

.contact__wrapper {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 48px;
  align-items: start;
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact__info-card {
  display: flex;
  gap: 16px;
  align-items: start;
  padding: 20px;
  border-radius: var(--radius);
  background: var(--bg-light);
  transition: var(--transition);
}

.contact__info-card:hover {
  background: var(--bg-section);
}

.contact__info-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  font-size: 1rem;
}

.contact__info-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 4px;
}

.contact__info-card p {
  font-size: 0.9rem;
  color: var(--gray-500);
  line-height: 1.6;
}

.contact__info-card a {
  color: var(--primary);
  font-weight: 600;
}

.contact__info-card a:hover {
  text-decoration: underline;
}

.contact__hours {
  font-size: 0.8rem !important;
  color: var(--gray-500);
}

.contact__socials {
  display: flex;
  gap: 12px;
  margin-top: 4px;
}

.contact__socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--white);
  color: var(--gray-500);
  font-size: 0.9rem;
  border: 1px solid var(--gray-300);
}

.contact__socials a:hover {
  background: var(--primary);
  color: var(--white);
  border-color: var(--primary);
}

/* Contact Form */
.contact__form {
  background: var(--white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-md);
}

.form__group {
  margin-bottom: 20px;
}

.form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form__group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 8px;
}

.form__group input,
.form__group select,
.form__group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.95rem;
  color: var(--dark);
  transition: var(--transition);
  background: var(--white);
}

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

.form__group input::placeholder,
.form__group textarea::placeholder {
  color: var(--gray-300);
}

.form__group textarea {
  resize: vertical;
  min-height: 100px;
}

.form__note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--gray-500);
  margin-top: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.form__note i {
  color: var(--accent);
}

/* Form success message */
.form__success {
  text-align: center;
  padding: 40px;
}

.form__success i {
  font-size: 3rem;
  color: #10B981;
  margin-bottom: 16px;
}

.form__success h3 {
  font-size: 1.3rem;
  color: var(--dark);
  margin-bottom: 8px;
}

.form__success p {
  color: var(--gray-500);
}

/* ===========================
   CTA BANNER
   =========================== */
.cta {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 60%, #6B0F1A 100%);
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(212,168,67,0.1);
}

.cta__content {
  text-align: center;
  position: relative;
  z-index: 2;
}

.cta__content h2 {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--white);
  margin-bottom: 16px;
}

.cta__content p {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.8);
  max-width: 600px;
  margin: 0 auto 32px;
  line-height: 1.7;
}

/* ===========================
   FOOTER
   =========================== */
.footer {
  background: var(--bg-dark);
  color: rgba(255,255,255,0.7);
  padding-top: 60px;
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer__brand .nav__logo .logo-text {
  color: rgba(255,255,255,0.5);
}

.footer__brand p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-top: 16px;
  margin-bottom: 20px;
}

.footer__socials {
  display: flex;
  gap: 12px;
}

.footer__socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer__socials a:hover {
  background: var(--primary);
  color: var(--white);
}

.footer__links h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 20px;
}

.footer__links ul li {
  margin-bottom: 10px;
}

.footer__links ul li a,
.footer__links ul li {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.5);
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer__links ul li a:hover {
  color: var(--accent-light);
}

.footer__links ul li i {
  font-size: 0.8rem;
  color: var(--primary-light);
}

.footer__bottom {
  text-align: center;
  padding: 20px 0;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.3);
}

/* ===========================
   BACK TO TOP
   =========================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--white);
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  box-shadow: 0 4px 15px rgba(196,30,58,0.3);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: var(--transition);
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
}

/* ===========================
   FLOATING CONTACT BUTTONS
   =========================== */
.floating-contact {
  position: fixed;
  bottom: 90px;
  right: 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 900;
}

.floating-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--white);
  font-size: 1.2rem;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  animation: pulse-float 2s infinite;
}

.floating-btn:hover {
  transform: scale(1.1);
}

.floating-btn--phone {
  background: #10B981;
}

.floating-btn--zalo {
  background: #0068FF;
  font-size: 0.75rem;
}

@keyframes pulse-float {
  0%, 100% { box-shadow: 0 4px 20px rgba(0,0,0,0.15); }
  50% { box-shadow: 0 4px 30px rgba(0,0,0,0.25); }
}

/* ===========================
   RESPONSIVE
   =========================== */
@media (max-width: 1024px) {
  .section__title {
    font-size: 2rem;
  }

  .hero__title {
    font-size: 2.8rem;
  }

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

  .services__grid {
    grid-template-columns: 1fr;
  }

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

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

  .contact__wrapper {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .system__tabs {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .system__tab {
    min-width: unset;
    padding: 16px 20px;
  }

  .section {
    padding: 70px 0;
  }

  .section__title {
    font-size: 1.75rem;
  }

  .hero__title {
    font-size: 2.2rem;
  }

  .hero__stats {
    gap: 24px;
  }

  .hero__stat-number {
    font-size: 2rem;
  }

  /* Mobile nav */
  .nav__menu {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    padding: 100px 32px 32px;
    box-shadow: var(--shadow-xl);
    transition: 0.4s ease;
    z-index: 999;
    gap: 4px;
  }

  .nav__menu.open {
    right: 0;
  }

  .nav__link {
    padding: 14px 16px;
    font-size: 1.05rem;
    border-bottom: 1px solid var(--gray-100);
  }

  .nav__link--cta {
    text-align: center;
    margin-top: 16px;
    border-bottom: none;
  }

  .nav__toggle {
    display: block;
    z-index: 1001;
  }

  .about__grid {
    grid-template-columns: 1fr;
  }

  .testimonials__grid {
    grid-template-columns: 1fr;
  }

  .form__row {
    grid-template-columns: 1fr;
  }

  .contact__form {
    padding: 28px 20px;
  }

  .clients__logos {
    gap: 16px;
  }

  .client__logo {
    font-size: 0.85rem;
    padding: 8px 14px;
  }

  .footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .steps__timeline {
    left: 28px;
  }

  .step__number {
    width: 60px;
    height: 60px;
    font-size: 1rem;
  }

  .step {
    gap: 16px;
  }

  .step__content {
    padding: 20px;
  }

  .cta__content h2 {
    font-size: 1.6rem;
  }

  .floating-contact {
    right: 16px;
    bottom: 80px;
  }

  .back-to-top {
    right: 16px;
    bottom: 20px;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 1.8rem;
  }

  .hero__actions {
    flex-direction: column;
  }

  .hero__stats {
    flex-direction: column;
    gap: 16px;
  }

  .hero__badge {
    font-size: 0.75rem;
  }
}

/* --- Overlay for mobile menu --- */
.nav__overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 998;
}

.nav__overlay.open {
  opacity: 1;
  visibility: visible;
}