/* ============================================
   ILKWANG STEEL - Main Stylesheet
   Reference: dongnammodern.co.kr style
   ============================================ */

@import 'tokens.css';

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

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

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-gray-800);
  background-color: var(--color-white);
  overflow-x: hidden;
}

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

ul, ol {
  list-style: none;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* --- Utility: Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

/* --- Utility: Section --- */
.section {
  padding: var(--section-padding-y) var(--section-padding-x);
}

.section--dark {
  background-color: var(--color-primary-800);
  color: var(--color-white);
}

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

/* --- Utility: Section Header --- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  color: var(--color-accent-500);
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-primary-800);
}

.section--dark .section-title {
  color: var(--color-white);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-gray-400);
  margin-top: var(--space-4);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.section-divider {
  width: 60px;
  height: 3px;
  background-color: var(--color-accent-500);
  margin: var(--space-6) auto 0;
}


/* ============================================
   HEADER
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-header);
  transition: background-color var(--transition-base),
              box-shadow var(--transition-base),
              padding var(--transition-base);
  padding: var(--space-6) 0;
}

.header--transparent {
  background-color: transparent;
}

.header--solid {
  background-color: rgba(13, 17, 23, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
  padding: var(--space-3) 0;
}

.header__inner {
  display: flex;
  align-items: center;
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-8);
}

.header__logo {
  margin-right: auto;
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  z-index: var(--z-header);
}

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

.header__logo-text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  letter-spacing: var(--letter-spacing-wide);
  white-space: nowrap;
}

.header__logo-sub {
  display: block;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-regular);
  letter-spacing: var(--letter-spacing-wider);
  color: var(--color-accent-400);
  margin-top: 2px;
}

/* Navigation */
.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav-item {
  position: relative;
}

.nav-item > .header__nav-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.85);
  letter-spacing: var(--letter-spacing-wide);
  position: relative;
  padding: var(--space-3) var(--space-1);
  transition: color var(--transition-fast);
  display: block;
}

.nav-item > .header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent-500);
  transition: width var(--transition-base);
}

.nav-item:hover > .header__nav-link,
.nav-item > .header__nav-link--active {
  color: var(--color-white);
}

.nav-item:hover > .header__nav-link::after {
  width: 100%;
}

/* Dropdown */
.nav-item .dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 180px;
  background: rgba(10, 12, 20, 0.95);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 6px;
  padding: var(--space-2) 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s, transform 0.25s;
  z-index: 100;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.nav-item:hover .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-item .dropdown li a {
  display: block;
  padding: var(--space-3) var(--space-5);
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.7);
  white-space: nowrap;
  transition: background 0.2s, color 0.2s;
}

.nav-item .dropdown li a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--color-accent-400);
}

/* Header CTA */
.header-cta {
  margin-left: var(--space-6);
  flex-shrink: 0;
}

.btn-quote {
  display: inline-block;
  padding: var(--space-2) var(--space-5);
  font-size: 0.8rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  background: var(--color-accent-500);
  border-radius: 4px;
  letter-spacing: 0.02em;
  transition: background 0.2s, transform 0.2s;
}

.btn-quote:hover {
  background: var(--color-accent-400);
  transform: translateY(-1px);
}

.header--solid .btn-quote {
  background: var(--color-accent-500);
}

/* Mobile Menu Sections */
.header__mobile-menu .mobile-section {
  margin-bottom: var(--space-4);
  text-align: center;
}

.header__mobile-menu .mobile-section-title {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-400);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
  margin-bottom: var(--space-2);
}

.header__mobile-menu .mobile-section .header__nav-link {
  font-size: var(--font-size-base);
  display: block;
  padding: var(--space-1) 0;
  color: rgba(255, 255, 255, 0.75);
}

.header__mobile-menu .mobile-section .header__nav-link:hover {
  color: var(--color-white);
}

/* Hamburger */
.header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 32px;
  height: 32px;
  gap: 6px;
  z-index: var(--z-header);
  cursor: pointer;
}

.header__hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.header__hamburger--open span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.header__hamburger--open span:nth-child(2) {
  opacity: 0;
}

.header__hamburger--open span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu */
.header__mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: var(--color-primary-900);
  z-index: calc(var(--z-header) - 1);
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--space-8);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.header__mobile-menu--open {
  display: flex;
  opacity: 1;
  visibility: visible;
}

.header__mobile-menu .header__nav-link {
  font-size: var(--font-size-2xl);
  color: var(--color-white);
}


/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
  background-color: var(--color-primary-900);
}

/* Slide */
.hero__slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 1.2s ease;
  z-index: 1;
}

.hero__slide--active {
  opacity: 1;
  z-index: 2;
}

.hero__slide-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  transform: scale(1.05);
  transition: transform 8s ease-out;
}

.hero__slide--active .hero__slide-bg {
  transform: scale(1);
}

/* Overlay */
.hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--overlay-gradient);
  z-index: 3;
}

/* Hero Content */
.hero__content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 4;
  text-align: center;
  width: 90%;
  max-width: 1000px;
}

.hero__company {
  font-size: var(--font-size-hero);
  font-weight: var(--font-weight-black);
  color: var(--color-white);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  text-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
  margin-bottom: var(--space-6);
}

.hero__company-accent {
  color: var(--color-accent-500);
}

.hero__tagline {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
  color: rgba(255, 255, 255, 0.8);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  margin-bottom: var(--space-10);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-10);
  border: 2px solid var(--color-accent-500);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  transition: background-color var(--transition-base), color var(--transition-base);
}

.hero__cta:hover {
  background-color: var(--color-accent-500);
  color: var(--color-white);
}

/* Slide Indicators */
.hero__indicators {
  position: absolute;
  bottom: var(--space-12);
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  gap: var(--space-3);
}

.hero__dot {
  width: 12px;
  height: 12px;
  border-radius: var(--radius-full);
  border: 2px solid rgba(255, 255, 255, 0.5);
  background: transparent;
  cursor: pointer;
  transition: background-color var(--transition-base), border-color var(--transition-base);
}

.hero__dot--active {
  background-color: var(--color-accent-500);
  border-color: var(--color-accent-500);
}

/* Scroll Down Arrow */
.hero__scroll-down {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-xs);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  cursor: pointer;
}

.hero__scroll-arrow {
  width: 24px;
  height: 24px;
  border-right: 2px solid rgba(255, 255, 255, 0.6);
  border-bottom: 2px solid rgba(255, 255, 255, 0.6);
  transform: rotate(45deg);
  animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: rotate(45deg) translateY(0); }
  50% { transform: rotate(45deg) translateY(8px); }
}


/* ============================================
   ABOUT SECTION
   ============================================ */
.about {
  position: relative;
  overflow: hidden;
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}

.about__image-wrap {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
}

.about__image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slower);
}

.about__image-wrap:hover img {
  transform: scale(1.05);
}

.about__image-accent {
  position: absolute;
  bottom: -20px;
  right: -20px;
  width: 200px;
  height: 200px;
  border: 3px solid var(--color-accent-500);
  opacity: 0.3;
  z-index: -1;
}

.about__text-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  color: var(--color-accent-500);
  margin-bottom: var(--space-4);
}

.about__text-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-snug);
  color: var(--color-primary-800);
  margin-bottom: var(--space-6);
}

.about__text-desc {
  font-size: var(--font-size-base);
  color: var(--color-gray-500);
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-8);
}

/* Counter Stats */
.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  margin-top: var(--space-10);
}

.about__stat {
  text-align: center;
}

.about__stat-number {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-black);
  color: var(--color-accent-500);
  line-height: 1;
}

.about__stat-unit {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-accent-600);
}

.about__stat-label {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  margin-top: var(--space-2);
  letter-spacing: var(--letter-spacing-wide);
}


/* ============================================
   BUSINESS SECTION
   ============================================ */
.business__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
}

.business__card {
  position: relative;
  height: 420px;
  overflow: hidden;
  border-radius: var(--radius-md);
  cursor: pointer;
  group: true;
}

.business__card-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform var(--transition-slower);
}

.business__card:hover .business__card-bg {
  transform: scale(1.1);
}

.business__card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    transparent 30%,
    rgba(10, 12, 20, 0.85) 100%
  );
  transition: background var(--transition-base);
}

.business__card:hover .business__card-overlay {
  background: linear-gradient(
    180deg,
    rgba(240, 122, 26, 0.1) 0%,
    rgba(10, 12, 20, 0.9) 100%
  );
}

.business__card-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-8);
  z-index: 2;
}

.business__card-icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-4);
  color: var(--color-accent-400);
  transition: transform var(--transition-base);
}

.business__card:hover .business__card-icon {
  transform: translateY(-4px);
}

.business__card-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--space-3);
}

.business__card-desc {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
  line-height: var(--line-height-relaxed);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.business__card:hover .business__card-desc {
  opacity: 1;
  transform: translateY(0);
}

.business__card-line {
  width: 40px;
  height: 3px;
  background-color: var(--color-accent-500);
  margin-top: var(--space-4);
  transition: width var(--transition-base);
}

.business__card:hover .business__card-line {
  width: 80px;
}


/* ============================================
   EQUIPMENT / GALLERY SECTION
   ============================================ */
.equipment__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
}

.equipment__item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  aspect-ratio: 4 / 3;
  cursor: pointer;
}

.equipment__item--large {
  grid-column: span 2;
  grid-row: span 2;
  aspect-ratio: auto;
}

.equipment__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slower);
}

.equipment__item:hover img {
  transform: scale(1.08);
}

.equipment__item-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--overlay-dark);
  opacity: 0;
  transition: opacity var(--transition-base);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: var(--space-6);
}

.equipment__item:hover .equipment__item-overlay {
  opacity: 1;
}

.equipment__item-title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--space-2);
}

.equipment__item-desc {
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.7);
}

.equipment__item-icon {
  font-size: var(--font-size-2xl);
  color: var(--color-accent-400);
  margin-bottom: var(--space-4);
}


/* ============================================
   HISTORY / TIMELINE SECTION
   ============================================ */
.history {
  position: relative;
}

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

.history__timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 2px;
  height: 100%;
  background: linear-gradient(
    180deg,
    var(--color-accent-500) 0%,
    var(--color-gray-200) 100%
  );
}

.history__item {
  position: relative;
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--space-12);
}

.history__item:nth-child(odd) {
  flex-direction: row-reverse;
  text-align: right;
}

.history__item-dot {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent-500);
  border: 3px solid var(--color-white);
  box-shadow: var(--shadow-md);
  z-index: 2;
}

.history__item-content {
  width: calc(50% - var(--space-10));
  padding: var(--space-6);
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.history__item-content:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.history__item-year {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-black);
  color: var(--color-accent-500);
  margin-bottom: var(--space-2);
}

.history__item-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-800);
  margin-bottom: var(--space-2);
}

.history__item-desc {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  line-height: var(--line-height-relaxed);
}


/* ============================================
   CONTACT SECTION
   ============================================ */
.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
}

.contact__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.contact__info-item {
  display: flex;
  gap: var(--space-4);
}

.contact__info-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-accent-500);
  color: var(--color-white);
  border-radius: var(--radius-md);
  font-size: var(--font-size-xl);
}

.contact__info-text h4 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-800);
  margin-bottom: var(--space-1);
}

.contact__info-text p {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  line-height: var(--line-height-relaxed);
}

/* Contact Form */
.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.contact__form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.contact__form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.contact__form-label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-primary-800);
}

.contact__form-input,
.contact__form-textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  color: var(--color-primary-800);
  background-color: var(--color-gray-50);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

.contact__form-input:focus,
.contact__form-textarea:focus {
  border-color: var(--color-accent-500);
  box-shadow: 0 0 0 3px rgba(240, 122, 26, 0.15);
  background-color: var(--color-white);
}

.contact__form-textarea {
  resize: vertical;
  min-height: 140px;
}

.contact__form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-10);
  background-color: var(--color-accent-500);
  color: var(--color-white);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-wide);
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), transform var(--transition-fast);
  align-self: flex-start;
}

.contact__form-submit:hover {
  background-color: var(--color-accent-600);
  transform: translateY(-2px);
}

.contact__form-submit:active {
  transform: translateY(0);
}


/* ============================================
   FOOTER
   ============================================ */
.footer {
  background-color: var(--color-primary-900);
  color: rgba(255, 255, 255, 0.6);
  padding: var(--space-16) 0 var(--space-8);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: var(--space-16);
  align-items: start;
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.footer__logo-text {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  letter-spacing: var(--letter-spacing-wide);
}

.footer__logo-sub {
  font-size: var(--font-size-xs);
  color: var(--color-accent-400);
  letter-spacing: var(--letter-spacing-wider);
}

.footer__brand-desc {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
  max-width: 400px;
}

.footer__column-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  margin-bottom: var(--space-6);
}

.footer__address,
.footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer__address-item,
.footer__contact-item {
  font-size: var(--font-size-sm);
  line-height: var(--line-height-relaxed);
}

.footer__address-label,
.footer__contact-label {
  color: var(--color-accent-400);
  font-weight: var(--font-weight-medium);
  display: block;
  margin-bottom: 2px;
}

.footer__divider {
  width: 100%;
  height: 1px;
  background-color: rgba(255, 255, 255, 0.1);
  margin: var(--space-10) 0 var(--space-6);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.4);
}


/* ============================================
   SCROLL TO TOP
   ============================================ */
.scroll-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  background-color: var(--color-accent-500);
  color: var(--color-white);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-xl);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity var(--transition-base),
              visibility var(--transition-base),
              transform var(--transition-base),
              background-color var(--transition-fast);
  z-index: var(--z-sticky);
  cursor: pointer;
}

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

.scroll-top:hover {
  background-color: var(--color-accent-600);
  transform: translateY(-4px);
}


/* ============================================
   SCROLL REVEAL ANIMATIONS
   ============================================ */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.reveal--left {
  transform: translateX(-40px);
}

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

.reveal--right {
  transform: translateX(40px);
}

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

.reveal--scale {
  transform: scale(0.9);
}

.reveal--scale.reveal--visible {
  transform: scale(1);
}

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal-stagger--visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger--visible > *:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger--visible > *:nth-child(3) { transition-delay: 200ms; }
.reveal-stagger--visible > *:nth-child(4) { transition-delay: 300ms; }
.reveal-stagger--visible > *:nth-child(5) { transition-delay: 400ms; }
.reveal-stagger--visible > *:nth-child(6) { transition-delay: 500ms; }

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


/* ============================================
   LOADING OVERLAY (optional)
   ============================================ */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--color-primary-900);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}

.loading-overlay--hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-spinner {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--color-accent-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}


/* ============================================
   RESPONSIVE: 1024px (Tablet Landscape)
   ============================================ */
@media (max-width: 1024px) {
  :root {
    --section-padding-y: var(--space-20);
  }

  .hero__company {
    font-size: var(--font-size-5xl);
  }

  .about__grid {
    gap: var(--space-10);
  }

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

  .business__card {
    height: 360px;
  }

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

  .footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }

  .footer__brand {
    grid-column: span 2;
  }
}


/* ============================================
   RESPONSIVE: 768px (Tablet Portrait)
   ============================================ */
@media (max-width: 768px) {
  :root {
    --section-padding-y: var(--space-16);
  }

  /* Header */
  .header__nav {
    display: none;
  }

  .header-cta {
    display: none;
  }

  .header__hamburger {
    display: flex;
  }

  /* Hero */
  .hero__company {
    font-size: var(--font-size-4xl);
  }

  .hero__tagline {
    font-size: var(--font-size-base);
  }

  /* Section */
  .section-title {
    font-size: var(--font-size-3xl);
  }

  /* About */
  .about__grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

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

  /* Business */
  .business__grid {
    grid-template-columns: 1fr;
  }

  .business__card {
    height: 320px;
  }

  .business__card-desc {
    opacity: 1;
    transform: translateY(0);
  }

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

  .equipment__item--large {
    grid-column: span 2;
    grid-row: span 1;
    aspect-ratio: 16 / 9;
  }

  /* History */
  .history__timeline::before {
    left: 20px;
  }

  .history__item,
  .history__item:nth-child(odd) {
    flex-direction: row;
    text-align: left;
    padding-left: 60px;
  }

  .history__item-dot {
    left: 20px;
  }

  .history__item-content {
    width: 100%;
  }

  /* Contact */
  .contact__grid {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  /* Footer */
  .footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }

  .footer__brand {
    grid-column: span 1;
  }

  .footer__bottom {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}


/* ============================================
   RESPONSIVE: 480px (Mobile)
   ============================================ */
@media (max-width: 480px) {
  :root {
    --section-padding-y: var(--space-12);
    --section-padding-x: var(--space-4);
  }

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

  .hero__tagline {
    font-size: var(--font-size-sm);
    letter-spacing: var(--letter-spacing-wide);
  }

  .hero__cta {
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-xs);
  }

  .section-title {
    font-size: var(--font-size-2xl);
  }

  .about__stats {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .about__stat-number {
    font-size: var(--font-size-3xl);
  }

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

  .equipment__item--large {
    grid-column: span 1;
  }

  .contact__form-row {
    grid-template-columns: 1fr;
  }

  .scroll-top {
    width: 40px;
    height: 40px;
    bottom: var(--space-4);
    right: var(--space-4);
    font-size: var(--font-size-base);
  }
}