/* ============================================
   THẢO ĐIỀN LOGISTICS- INDUSTRIAL KINETIC
   Premium Single-Page Website
   ============================================ */

/* --- Design Tokens --- */
:root {
  --color-gold: #F2C94C;
  --color-gold-dark: #D4A017;
  --color-gold-light: #FBE8A6;
  --color-charcoal: #1A1A1A;
  --color-charcoal-mid: #2D2D2D;
  --color-off-white: #FAFAF5;
  --color-warm-gray: #B0A89A;
  --color-accent: #E85D2C;

  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  --space-5xl: 128px;

  --radius: 2px;
  --transition-base: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background: var(--color-off-white);
  color: var(--color-charcoal);
  line-height: 1.6;
  overflow-x: hidden;
}

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

ul {
  list-style: none;
}

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

/* --- Typography --- */
h1,
h2,
h3,
h4,
h5 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 7vw, 5.5rem);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
}

h4 {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
}

p {
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  max-width: 65ch;
}

/* --- Utility --- */
.container {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --- NAVIGATION --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: var(--space-md) 0;
  transition: background var(--transition-base), box-shadow var(--transition-base);
}

.nav.scrolled {
  background: rgba(26, 26, 26, 0.97);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

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

.nav__logo {
  height: 44px;
  width: auto;
  transition: transform var(--transition-spring);
}

.nav__logo:hover {
  transform: scale(1.05);
}

.nav__links {
  display: flex;
  gap: var(--space-xl);
  align-items: center;
}

.nav__link {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-off-white);
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--transition-base);
}

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

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

.nav__link:hover {
  color: var(--color-gold);
}

.nav__cta {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-gold);
  color: var(--color-charcoal);
  border: 2px solid var(--color-gold);
  cursor: pointer;
  transition: all var(--transition-spring);
}

.nav__cta:hover {
  background: transparent;
  color: var(--color-gold);
  transform: translateY(-2px);
}

/* Hamburger */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 1001;
  background: none;
  border: none;
  padding: var(--space-sm);
}

.nav__hamburger span {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--color-off-white);
  transition: all var(--transition-base);
  transform-origin: center;
}

.nav__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav__hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu */
.nav__mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 400px;
  height: 100vh;
  background: var(--color-charcoal);
  padding: var(--space-4xl) var(--space-2xl);
  transition: right var(--transition-slow);
  z-index: 999;
}

.nav__mobile-menu.open {
  right: 0;
}

.nav__mobile-menu .nav__link {
  display: block;
  font-size: 1.3rem;
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-charcoal-mid);
}

.nav__mobile-menu .nav__cta {
  display: inline-block;
  margin-top: var(--space-xl);
}

.nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 998;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.nav__overlay.visible {
  opacity: 1;
}

/* --- HERO --- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--color-charcoal);
  overflow: hidden;
}

.hero__bg-image {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.15;
  filter: grayscale(1) contrast(1.2);
}

.hero__bg-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__bg-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: var(--font-heading);
  font-size: clamp(6rem, 18vw, 20rem);
  font-weight: 900;
  color: var(--color-charcoal-mid);
  white-space: nowrap;
  user-select: none;
  pointer-events: none;
  letter-spacing: -0.04em;
  opacity: 0.4;
}

.hero__grain {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
}

.hero__content {
  position: relative;
  z-index: 2;
  width: 100%;
  padding-top: var(--space-4xl);
}

.hero__badge {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  border: 1px solid var(--color-gold);
  padding: var(--space-sm) var(--space-lg);
  margin-bottom: var(--space-xl);
}

.hero__title {
  color: var(--color-off-white);
  margin-bottom: var(--space-lg);
}

.hero__title-accent {
  color: var(--color-gold);
  display: block;
}

.hero__subtitle {
  color: var(--color-warm-gray);
  font-size: clamp(1rem, 1.8vw, 1.35rem);
  margin-bottom: var(--space-2xl);
  max-width: 550px;
}

.hero__actions {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
  align-items: center;
}

.btn {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: var(--space-md) var(--space-xl);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-spring);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
}

.btn--primary {
  background: var(--color-gold);
  color: var(--color-charcoal);
  border-color: var(--color-gold);
}

.btn--primary:hover {
  background: var(--color-gold-dark);
  border-color: var(--color-gold-dark);
  transform: translateY(-3px);
  box-shadow: 0 8px 30px rgba(242, 201, 76, 0.3);
}

.btn--outline {
  background: transparent;
  color: var(--color-off-white);
  border-color: var(--color-off-white);
}

.btn--outline:hover {
  background: var(--color-off-white);
  color: var(--color-charcoal);
  transform: translateY(-3px);
}

.hero__scroll-indicator {
  position: absolute;
  bottom: var(--space-2xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-warm-gray);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: var(--color-warm-gray);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {

  0%,
  100% {
    transform: scaleY(1);
    opacity: 0.5;
  }

  50% {
    transform: scaleY(1.5);
    opacity: 1;
  }
}

/* --- STATS BAR --- */
.stats {
  background: var(--color-gold);
  padding: var(--space-2xl) 0;
  position: relative;
  z-index: 5;
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-lg);
  text-align: center;
}

.stats__item {
  padding: var(--space-md);
}

.stats__number {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  color: var(--color-charcoal);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stats__label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-charcoal);
  opacity: 0.7;
}

/* --- SECTION SHARED --- */
.section {
  padding: var(--space-5xl) 0;
  position: relative;
}

.section--dark {
  background: var(--color-charcoal);
  color: var(--color-off-white);
}

.section__header {
  margin-bottom: var(--space-3xl);
}

.section__eyebrow {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-gold);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.section__eyebrow::before {
  content: '';
  width: 40px;
  height: 2px;
  background: var(--color-gold);
}

.section__title {
  margin-bottom: var(--space-md);
}

.section__desc {
  color: var(--color-warm-gray);
  max-width: 600px;
}

/* --- SERVICES --- */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.service-card {
  padding: var(--space-2xl);
  background: var(--color-charcoal-mid);
  border: 1px solid rgba(255, 255, 255, 0.06);
  position: relative;
  overflow: hidden;
  transition: all var(--transition-spring);
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.service-card:hover::before {
  transform: scaleX(1);
}

.service-card__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  margin-bottom: var(--space-lg);
  background: var(--color-charcoal);
}

.service-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.service-card:hover .service-card__img img {
  transform: scale(1.1);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  color: var(--color-gold);
  font-size: 1.8rem;
}

.service-card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-off-white);
}

.service-card__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.service-card__list li {
  font-size: 0.9rem;
  color: var(--color-warm-gray);
  padding-left: var(--space-lg);
  position: relative;
  line-height: 1.5;
}

.service-card__list li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--color-gold);
  font-weight: 700;
}

/* --- ABOUT / GIỚI THIỆU --- */
.about__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.about__text p {
  margin-bottom: var(--space-lg);
  color: var(--color-charcoal);
  line-height: 1.8;
}

.about__img {
  margin-top: var(--space-2xl);
  border: 1px solid rgba(26, 26, 26, 0.1);
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.about__img img {
  width: 100%;
  height: auto;
  display: block;
}

.about__features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
}

.about__feature {
  padding: var(--space-lg);
  border: 1px solid rgba(26, 26, 26, 0.1);
  transition: all var(--transition-spring);
}

.about__feature:hover {
  border-color: var(--color-gold);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.about__feature-icon {
  font-size: 1.6rem;
  margin-bottom: var(--space-md);
}

.about__feature-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.about__feature-desc {
  font-size: 0.85rem;
  color: var(--color-warm-gray);
  line-height: 1.5;
}

/* --- CONTACT --- */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.contact__item {
  display: flex;
  gap: var(--space-lg);
  align-items: flex-start;
}

.contact__item-icon {
  width: 48px;
  height: 48px;
  background: var(--color-gold);
  color: var(--color-charcoal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

.contact__item-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-warm-gray);
  margin-bottom: var(--space-xs);
}

.contact__item-value {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
}

.contact__item-value a {
  transition: color var(--transition-base);
}

.contact__item-value a:hover {
  color: var(--color-gold);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact__form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.contact__form-label {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-warm-gray);
}

.contact__form-input,
.contact__form-textarea {
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: var(--space-md);
  background: var(--color-charcoal-mid);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-off-white);
  transition: border-color var(--transition-base);
  outline: none;
}

.contact__form-input:focus,
.contact__form-textarea:focus {
  border-color: var(--color-gold);
}

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

.contact__form .btn {
  align-self: flex-start;
}

/* --- FOOTER --- */
.footer {
  background: var(--color-charcoal);
  border-top: 1px solid var(--color-charcoal-mid);
  padding: var(--space-2xl) 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer__copy {
  font-size: 0.8rem;
  color: var(--color-warm-gray);
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__link {
  font-size: 0.8rem;
  color: var(--color-warm-gray);
  transition: color var(--transition-base);
}

.footer__link:hover {
  color: var(--color-gold);
}

/* --- FLOATING CTA (Zalo) --- */
.floating-cta {
  position: fixed;
  bottom: var(--space-xl);
  right: var(--space-xl);
  z-index: 900;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

.floating-cta__btn {
  width: 60px;
  height: 60px;
  background: var(--color-gold);
  color: var(--color-charcoal);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 800;
  cursor: pointer;
  box-shadow: 0 8px 30px rgba(242, 201, 76, 0.4);
  transition: all var(--transition-spring);
  text-decoration: none;
}

.floating-cta__btn:hover {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 12px 40px rgba(242, 201, 76, 0.6);
}

.floating-cta__label {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-charcoal);
}

/* --- SCROLL REVEAL ANIMATIONS --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

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

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.8s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* Staggered children */
.stagger>* {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
    transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.stagger.visible>*:nth-child(1) {
  transition-delay: 0s;
}

.stagger.visible>*:nth-child(2) {
  transition-delay: 0.1s;
}

.stagger.visible>*:nth-child(3) {
  transition-delay: 0.2s;
}

.stagger.visible>*:nth-child(4) {
  transition-delay: 0.3s;
}

.stagger.visible>*:nth-child(5) {
  transition-delay: 0.4s;
}

.stagger.visible>*:nth-child(6) {
  transition-delay: 0.5s;
}

.stagger.visible>* {
  opacity: 1;
  transform: translateY(0);
}

/* --- REDUCED MOTION --- */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal,
  .reveal-left,
  .reveal-right,
  .stagger>* {
    opacity: 1;
    transform: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* --- RESPONSIVE --- */

/* Tablet */
@media (max-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

/* Mobile */
@media (max-width: 768px) {
  .nav__links {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__mobile-menu {
    display: block;
  }

  h1 {
    font-size: clamp(2rem, 10vw, 3.5rem);
  }

  .hero__bg-text {
    font-size: clamp(4rem, 20vw, 10rem);
  }

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

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

  .stats__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
  }

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

  .section {
    padding: var(--space-3xl) 0;
  }

  .floating-cta {
    bottom: var(--space-md);
    right: var(--space-md);
  }

  .floating-cta__btn {
    width: 52px;
    height: 52px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--space-md);
  }

  .hero__actions {
    flex-direction: column;
    align-items: flex-start;
  }

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

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