/* ==========================================
   Layout Styles
   SISOBIO Corporate Website
   ========================================== */

/* ==========================================
   GLOBAL LAYOUT
   ========================================== */

body {
  font-family: var(--font-family-kr);
  font-size: var(--font-size-body);
  line-height: var(--line-height-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  transition: background-color var(--transition-base) var(--ease-in-out),
              color var(--transition-base) var(--ease-in-out);
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding-left: var(--container-padding-mobile);
  padding-right: var(--container-padding-mobile);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--container-padding-tablet);
    padding-right: var(--container-padding-tablet);
  }
}

@media (min-width: 1025px) {
  .container {
    padding-left: var(--container-padding-desktop);
    padding-right: var(--container-padding-desktop);
  }
}

/* Section Spacing */
.section {
  padding-top: var(--section-padding-mobile);
  padding-bottom: var(--section-padding-mobile);
}

@media (min-width: 768px) {
  .section {
    padding-top: var(--section-padding-tablet);
    padding-bottom: var(--section-padding-tablet);
  }
}

@media (min-width: 1025px) {
  .section {
    padding-top: var(--section-padding-desktop);
    padding-bottom: var(--section-padding-desktop);
  }
}

/* Alternate Section Background */
.section--alt {
  background-color: var(--color-bg-secondary);
}


/* ==========================================
   HEADER & NAVIGATION
   ========================================== */

.header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
  background-color: var(--color-bg-primary);
  border-bottom: 1px solid var(--color-border-light);
  transition: background-color var(--transition-base) var(--ease-in-out),
              box-shadow var(--transition-base) var(--ease-in-out);
}

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

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  gap: var(--spacing-lg);
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  font-size: var(--font-size-h5);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  transition: opacity var(--transition-base) var(--ease-in-out);
}

.nav__logo:hover {
  opacity: 0.8;
}

.nav__logo img {
  height: 40px;
  width: auto;
}

/* Desktop Navigation Menu */
.nav__menu {
  display: none;
  gap: var(--spacing-xl);
  align-items: center;
}

@media (min-width: 1025px) {
  .nav__menu {
    display: flex;
  }
}

.nav__menu a {
  font-size: var(--font-size-body);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-base) var(--ease-in-out);
  position: relative;
}

.nav__menu a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base) var(--ease-in-out);
}

.nav__menu a:hover {
  color: var(--color-primary);
}

.nav__menu a:hover::after {
  width: 100%;
}

/* Navigation Controls */
.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.btn-icon {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--button-radius);
  background-color: transparent;
  color: var(--color-text-secondary);
  transition: all var(--transition-base) var(--ease-in-out);
  cursor: pointer;
}

.btn-icon:hover {
  background-color: var(--color-surface-hover);
  color: var(--color-primary);
}

.icon {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

/* Theme Toggle Icons */
.icon-light {
  display: block;
}

.icon-dark {
  display: none;
}

[data-theme="dark"] .icon-light {
  display: none;
}

[data-theme="dark"] .icon-dark {
  display: block;
}

/* Hamburger Menu Button (Mobile) */
.btn-hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 6px;
  cursor: pointer;
}

@media (min-width: 1025px) {
  .btn-hamburger {
    display: none;
  }
}

.hamburger-line {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base) var(--ease-in-out);
}

.btn-hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.btn-hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}

.btn-hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* Mobile Menu Overlay */
.mobile-menu {
  position: fixed;
  top: 80px;
  left: 0;
  width: 100%;
  height: calc(100vh - 80px);
  background-color: var(--color-bg-primary);
  transform: translateX(-100%);
  transition: transform var(--transition-base) var(--ease-in-out);
  z-index: var(--z-modal);
  overflow-y: auto;
}

.mobile-menu[aria-hidden="false"] {
  transform: translateX(0);
}

.mobile-menu__nav {
  padding: var(--spacing-xl) var(--spacing-lg);
}

.mobile-menu__nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.mobile-menu__nav a {
  display: block;
  font-size: var(--font-size-h5);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border-light);
  transition: color var(--transition-base) var(--ease-in-out);
}

.mobile-menu__nav a:hover {
  color: var(--color-primary);
}


/* ==========================================
   HERO SECTION
   ========================================== */

.hero {
  position: relative;
  width: 100%;
  min-height: 600px;
  height: 100vh;
  max-height: 800px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  
  /* Parallax Background */
  background-image: url('../images/hero/ocean_desktop.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed; /* Parallax effect */
}

@media (max-width: 767px) {
  .hero {
    min-height: 500px;
    max-height: 700px;
  }
}

/* Hero Overlay */
.hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    180deg,
    rgba(0, 91, 150, 0.7) 0%,
    rgba(0, 91, 150, 0.5) 100%
  );
  z-index: 2;
}

/* Hero Content */
.hero__content {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  z-index: 3;
  width: 90%;
  max-width: 800px;
  padding: var(--spacing-xl) var(--spacing-lg);
  
  /* Explicitly center everything */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

@media (min-width: 768px) {
  .hero__content {
    width: 85%;
    max-width: 720px;
    padding: var(--spacing-xl) var(--spacing-2xl);
  }
}

@media (min-width: 1025px) {
  .hero__content {
    width: 80%;
    max-width: 900px;
  }
}

@media (min-width: 1440px) {
  .hero__content {
    width: 70%;
    max-width: 1000px;
  }
}

.hero__title {
  font-size: var(--font-size-h1);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-inverse);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  margin-bottom: var(--spacing-lg);
  width: 100%;
  text-align: center;
}

[data-theme="dark"] .hero__title {
  color: #FFFFFF;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.6);
}

.hero__subtitle {
  font-size: var(--font-size-h5);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-text-inverse);
  opacity: 0.95;
  margin-bottom: var(--spacing-2xl);
  width: 100%;
  text-align: center;
}

[data-theme="dark"] .hero__subtitle {
  color: #F5F5F5;
  opacity: 1;
}

/* Hero CTA Buttons */
.hero__cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  width: 100%;
}

/* Scroll Indicator */
.hero__scroll {
  position: absolute;
  bottom: var(--spacing-2xl);
  left: 50%;
  transform: translateX(-50%);
  cursor: pointer;
  z-index: 3;
  background: transparent;
  border: none;
  padding: 0;
  animation: bounce 2s infinite;
}

.hero__scroll .icon {
  width: 32px;
  height: 32px;
  color: var(--color-text-inverse);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}


/* ==========================================
   SECTION HEADERS
   ========================================== */

.section__header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.section__title {
  font-size: var(--font-size-h2);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.section__description {
  font-size: var(--font-size-body-lg);
  line-height: var(--line-height-normal);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

.section__description-line {
  display: block;
}


/* ==========================================
   ABOUT SECTION
   ========================================== */

.about__grid {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4xl);
  max-width: 900px;
  margin: 0 auto;
}

.about__overview,
.about__timeline {
  background-color: var(--color-surface);
  padding: var(--spacing-2xl);
  border-radius: var(--card-radius);
  box-shadow: var(--shadow);
}

@media (min-width: 768px) {
  .about__overview,
  .about__timeline {
    padding: var(--spacing-3xl);
  }
}

.about__subtitle {
  font-size: var(--font-size-h4);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  word-break: keep-all;
}


/* ==========================================
   BUSINESS SECTION
   ========================================== */

.business__grid {
  display: grid;
  gap: var(--card-gap-mobile);
}

@media (min-width: 768px) {
  .business__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--card-gap-tablet);
  }
}

@media (min-width: 1025px) {
  .business__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--card-gap-desktop);
  }
}


/* ==========================================
   PRODUCTS SECTION
   ========================================== */

.products__grid {
  display: grid;
  gap: var(--card-gap-mobile);
}

@media (min-width: 768px) {
  .products__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--card-gap-tablet);
  }
}

@media (min-width: 1025px) {
  .products__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--card-gap-desktop);
  }
}


/* ==========================================
   CERTIFICATIONS SECTION
   ========================================== */

.certifications__grid {
  display: grid;
  gap: var(--card-gap-mobile);
}

@media (min-width: 768px) {
  .certifications__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--card-gap-tablet);
  }
}

@media (min-width: 1025px) {
  .certifications__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--card-gap-desktop);
  }
}


/* ==========================================
   CONTACT SECTION
   ========================================== */


/* ==========================================
   FOOTER
   ========================================== */

.footer {
  background-color: var(--color-bg-tertiary);
  color: var(--color-text-secondary);
  padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

.footer__simple {
  text-align: center;
}

.footer__brand {
  margin-bottom: var(--spacing-2xl);
}

.footer__logo {
  font-size: var(--font-size-h3);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.footer__description {
  font-size: var(--font-size-body);
  line-height: var(--line-height-normal);
  color: var(--color-text-tertiary);
  max-width: 600px;
  margin: 0 auto;
}

.footer__bottom {
  border-top: 1px solid var(--color-border-light);
  padding-top: var(--spacing-xl);
  display: flex;
  justify-content: center;
  align-items: center;
}

.footer__copyright {
  font-size: var(--font-size-body-sm);
  color: var(--color-text-tertiary);
  text-align: center;
}