@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.min.css");

:root {
  /* Color Palette */
  --c-primary: #002b5e; /* Deep Blue */
  --c-primary-light: #004080;
  --c-accent: #0084ff; /* Tech Blue */
  --c-white: #ffffff;
  --c-gray-100: #f8fafc;
  --c-gray-200: #e2e8f0;
  --c-gray-500: #64748b;
  --c-gray-800: #1e293b;
  --c-gray-900: #0f172a;
  
  /* Layout */
  --max-width: 1200px;
  --nav-height: 80px;

  /* Typography */
  --font-family: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  color: var(--c-gray-800);
  background-color: var(--c-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  word-break: keep-all;
  overflow-wrap: break-word;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

ul {
  list-style: none;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ================= Header / Nav ================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-gray-200);
  z-index: 1000;
  transition: all 0.3s ease;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo a {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-primary);
  letter-spacing: -0.02em;
}

.main-nav .nav-list {
  display: flex;
  gap: 2rem;
}

.nav-item a {
  font-weight: 500;
  color: var(--c-gray-800);
  font-size: 1rem;
  position: relative;
  padding: 0.5rem 0;
}

.nav-item a:hover {
  color: var(--c-primary);
}

.nav-item.active a {
  color: var(--c-primary);
  font-weight: 600;
}

.nav-item.active a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--c-primary);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.mobile-menu-btn .bar {
  display: block;
  width: 25px;
  height: 2px;
  margin: 5px auto;
  background-color: var(--c-gray-800);
  transition: all 0.3s ease-in-out;
}

/* ================= Main Layout ================= */
main {
  margin-top: var(--nav-height);
  min-height: calc(100vh - var(--nav-height) - 300px); /* Adjust based on footer */
}

/* Section Common */
.section {
  padding: 5rem 0;
}

.section-bg {
  background-color: var(--c-gray-100);
}

.section-title {
  font-size: 2.25rem;
  font-weight: 700;
  color: var(--c-primary);
  margin-bottom: 1rem;
  text-align: center;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--c-gray-500);
  text-align: center;
  margin-bottom: 4rem;
}

/* ================= Hero Section (Home) ================= */
.hero {
  height: 80vh;
  min-height: 600px;
  background-image: url('../assets/hero_bg.png');
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  position: relative;
  margin-top: calc(-1 * var(--nav-height));
  padding-top: var(--nav-height);
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to right, rgba(0, 43, 94, 0.9), rgba(0, 43, 94, 0.6));
}

.hero-content {
  position: relative;
  z-index: 10;
  color: var(--c-white);
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  word-break: keep-all;
}

.hero p {
  font-size: 1.25rem;
  font-weight: 300;
  opacity: 0.9;
  margin-bottom: 2.5rem;
  word-break: keep-all;
}

/* ================= Cards ================= */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4rem;
  align-items: center;
}

.card {
  background: var(--c-white);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border: 1px solid var(--c-gray-200);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--c-primary);
  margin-bottom: 1rem;
}

.card-logo-placeholder {
  width: 100px;
  height: 100px;
  background-color: var(--c-gray-100);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-weight: 800;
  color: var(--c-gray-500);
  font-size: 0.8rem;
  text-align: center;
  border: 2px dashed var(--c-gray-200);
}


/* ================= Board ================= */
.board-container {
  max-width: 1000px;
  margin: 0 auto;
}

.board-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
  background: var(--c-white);
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  border-radius: 8px;
  overflow: hidden;
}

.board-table th, .board-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--c-gray-200);
}

.board-table th {
  background-color: var(--c-primary);
  color: var(--c-white);
  font-weight: 600;
}

.board-table tr:hover td {
  background-color: var(--c-gray-100);
}

.board-title {
  text-align: left;
  font-weight: 500;
  width: 50%;
}

.board-title a {
  display: block;
}

.board-title a:hover {
  color: var(--c-accent);
  text-decoration: underline;
}

.notice-row {
  background-color: #f0f7ff;
}

.notice-row .board-title a {
  font-weight: 700;
  color: var(--c-primary);
}

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.notice-badge {
  background-color: var(--c-accent);
  color: var(--c-white);
}

/* ================= Modal ================= */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  backdrop-filter: blur(4px);
}

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

.modal-content-box {
  background: var(--c-white);
  width: 90%;
  max-width: 800px;
  border-radius: 12px;
  padding: 3rem;
  position: relative;
  transform: translateY(20px);
  transition: all 0.3s ease;
  max-height: 80vh;
  overflow-y: auto;
}

.modal-overlay.active .modal-content-box {
  transform: translateY(0);
}

.modal-close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  background: none;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  color: var(--c-gray-500);
}

.modal-title {
  font-size: 1.75rem;
  color: var(--c-primary);
  margin-bottom: 1rem;
  padding-right: 2rem;
}

.modal-meta {
  color: var(--c-gray-500);
  font-size: 0.875rem;
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--c-gray-200);
}

.modal-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-gray-800);
}

/* ================= Footer ================= */
.site-footer {
  background-color: var(--c-gray-900);
  color: var(--c-gray-500);
  padding: 4rem 0;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-logo {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--c-white);
  margin-bottom: 1rem;
}

.company-detail {
  font-size: 0.875rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.company-detail span {
  display: inline-block;
  margin-right: 0.5rem;
}

.footer-partners {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.footer-partner-logo {
  height: 30px;
  opacity: 0.5;
  filter: grayscale(100%) brightness(200%);
  transition: opacity 0.3s ease;
}

.footer-partner-logo:hover {
  opacity: 1;
}

.copyright {
  font-size: 0.75rem;
}

/* ================= Responsive ================= */
@media (max-width: 992px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .mobile-menu-btn {
    display: block;
  }
  
  .main-nav {
    position: fixed;
    top: var(--nav-height);
    left: -100%;
    width: 100%;
    height: calc(100vh - var(--nav-height));
    background: var(--c-white);
    flex-direction: column;
    transition: 0.3s;
    padding: 2rem;
  }
  
  .main-nav.open {
    left: 0;
  }
  
  .main-nav .nav-list {
    flex-direction: column;
    gap: 1.5rem;
  }
  
  .board-table, .board-table tbody, .board-table tr, .board-table td {
    display: block;
    width: 100%;
  }

  .board-table thead {
    display: none;
  }
  
  .board-table td {
    text-align: right;
    padding-left: 50%;
    position: relative;
    border: none;
  }
  
  .board-table td::before {
    content: attr(data-label);
    position: absolute;
    left: 1rem;
    width: 45%;
    text-align: left;
    font-weight: 600;
  }
  
  .board-title {
    width: 100% !important;
  }
  
  .board-table tr {
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--c-gray-200);
    padding-bottom: 1rem;
  }

  .footer-container {
    flex-direction: column;
  }
}