/* ===== 기본 변수 및 리셋 ===== */
:root { 
  --primary: #1e3a8a; 
  --bg: #050812; 
  --text: #e5e7eb; 
  --muted: #9aa7bd;
  --panel: #060a18;
  --line: #0f1a2e;
  --nav-bg: rgba(5,8,18,.95);
  --nav-border: #0f1a2e;
  --card-bg: #060a18;
  --card-border: #0f1a2e;
  --button-bg: var(--primary);
  --button-hover: #1e40af;
  --badge-bg: #0a1428;
  --badge-border: #0f1a2e;
  --badge-text: #cde8ff;
  --tag-bg: #0a1428;
  --tag-border: #0f1a2e;
  --tag-text: #cde8ff;
}

/* ===== 기본 스타일 ===== */
* { box-sizing: border-box; }
body { 
  margin: 0; 
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Noto Sans KR, Arial, sans-serif; 
  color: var(--text); 
  background: var(--bg); 
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: #6ec7ff; text-decoration: none; }
.container { max-width: 1100px; margin: 0 auto; padding: 24px 16px; }

/* ===== 터치 최적화 ===== */
@media (hover: none) and (pointer: coarse) {
  .button, .menu a, .dropbtn, .tag {
    min-height: 44px;
    min-width: 44px;
  }
  
  .dropdown-content a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }
}

/* ===== 네비게이션 ===== */
nav { 
  position: sticky; 
  top: 0; 
  background: var(--nav-bg); 
  backdrop-filter: blur(6px); 
  border-bottom: 1px solid var(--nav-border); 
  z-index: 1000;
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; padding: 10px 16px; }
.brand { display: flex; align-items: center; gap: 12px; }
.brand img { width: 36px; height: 36px; border-radius: 8px; }
.brand .title { font-weight: 700; font-size: 20px; }
.menu { display: flex; gap: 12px; }
.menu a { 
  padding: 8px 12px; 
  border: 1px solid #213055; 
  border-radius: 999px; 
  background: transparent;
  color: var(--text);
  transition: all 0.2s ease;
  white-space: nowrap;
}
.menu a:hover { background: rgba(255,255,255,0.1); }

/* ===== 드롭다운 통합 스타일 ===== */
.dropdown { 
  position: relative; 
  display: inline-block; 
}
.dropbtn {
  background: transparent;
  border: 1px solid #213055;
  color: var(--text);
  border-radius: 999px;
  padding: 8px 12px;
  cursor: pointer;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}
.dropbtn:hover { 
  background: rgba(255,255,255,0.1); 
}
.caret { 
  font-size: 12px; 
  line-height: 1;
  transition: transform 0.2s ease;
}

.dropdown-content {
  position: absolute;
  top: 120%;
  left: 0;
  min-width: 260px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: 0 10px 24px rgba(0,0,0,0.3);
  display: none;
  z-index: 1000;
  overflow: hidden;
  padding: 6px;
}
.dropdown-content a {
  display: block;
  margin: 0;
  padding: 10px 12px;
  border: 0;
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  text-decoration: none;
  line-height: 1.2;
  white-space: nowrap;
  transition: background 0.2s ease;
}
.dropdown-content a:hover {
  background: rgba(255,255,255,0.1);
}
.dropdown-content a:first-child {
  font-weight: 700;
}

/* 드롭다운 호버 및 열림 상태 */
@media (hover: hover) and (pointer: fine) {
  .dropdown:hover .dropdown-content { 
    display: block; 
  }
  .dropdown:hover .dropbtn .caret { 
    transform: rotate(180deg); 
  }
}
.dropdown.open .dropdown-content { 
  display: block; 
}
.dropdown.open .dropbtn .caret { 
  transform: rotate(180deg); 
}

/* ===== 히어로 섹션 ===== */
.hero { 
  background: radial-gradient(600px 300px at 80% -10%, rgba(30,58,138,.4), transparent 60%); 
  padding: 20px 0;
}
.hero .container { 
  display: grid; 
  gap: 18px; 
  grid-template-columns: 1.2fr .8fr; 
}
.hero h1 {
  margin: 0 0 16px 0;
  font-size: 32px;
  line-height: 1.2;
  font-weight: 700;
}
.hero p {
  margin: 0 0 20px 0;
  font-size: 16px;
  line-height: 1.6;
  color: var(--muted);
}

/* ===== 버튼 및 배지 ===== */
.badges { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.badge { 
  background: var(--badge-bg); 
  border: 1px solid var(--badge-border); 
  padding: 6px 10px; 
  border-radius: 999px; 
  font-size: 12px; 
  color: var(--badge-text); 
}
.button { 
  background: var(--button-bg); 
  color: white; 
  border: none; 
  border-radius: 10px; 
  padding: 10px 14px; 
  font-weight: 600; 
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.button:hover { 
  background: var(--button-hover); 
  transform: translateY(-1px);
}
.button.ghost { 
  background: transparent; 
  border: 1px solid #365a8c; 
}
.button.ghost:hover { 
  background: rgba(255,255,255,0.1); 
}

/* ===== 카드 및 섹션 ===== */
.card { 
  background: var(--card-bg); 
  border: 1px solid var(--card-border); 
  border-radius: 16px; 
  padding: 16px; 
  transition: all 0.3s ease;
}
.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}
.kv { 
  display: grid; 
  grid-template-columns: repeat(2, 1fr); 
  gap: 8px; 
  margin: 10px 0; 
  font-size: 14px; 
  color: #c9d6e9; 
}
.slim { 
  margin: 10px 0 0; 
  padding-left: 18px; 
  color: #b6c4da; 
}
.section { 
  padding: 28px 0; 
}
.section h2 { 
  margin: 0 0 16px 0; 
  font-size: 24px;
  font-weight: 700;
  color: var(--text);
}
.grid { 
  display: grid; 
  gap: 14px; 
  grid-template-columns: repeat(2, 1fr); 
}

/* ===== 태그 및 기타 ===== */
.tags { 
  display: inline-flex; 
  gap: 6px; 
  align-items: center; 
  margin-top: 8px; 
}
.tag { 
  display: inline-block; 
  padding: 6px 10px; 
  background: var(--tag-bg); 
  border: 1px solid var(--tag-border); 
  border-radius: 999px; 
  font-size: 12px; 
  color: var(--tag-text); 
}
.notice { 
  color: var(--muted); 
  font-size: 12px; 
  margin-top: 8px; 
}
.footer { 
  border-top: 1px dashed #243045; 
  color: var(--muted); 
  font-size: 12px; 
  padding: 20px 0; 
  margin-top: 20px; 
}

/* ===== 테이블 ===== */
.table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}
.table th, .table td {
  border-bottom: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
}
.table th {
  background: var(--badge-bg);
  color: var(--badge-text);
}
.table tr:last-child td {
  border-bottom: none;
}

/* ===== 아이콘 리스트 ===== */
.icon-list {
  list-style: none;
  padding-left: 0;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, 1fr);
}
.icon-list li {
  margin: 8px 0;
  padding-left: 28px;
  background: url('/icons/check-circle.svg') no-repeat left center;
  background-size: 20px;
}
.icon-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
}
.icon-item img, .icon-item svg {
  width: 24px;
  height: 24px;
}

/* ===== 반응형 디자인 ===== */
@media (max-width: 900px) { 
  .hero .container { 
    grid-template-columns: 1fr; 
  } 
  .grid { 
    grid-template-columns: 1fr; 
  }
  .menu { 
    gap: 8px; 
    flex-wrap: wrap; 
  }
  .dropdown-content { 
    min-width: 220px; 
  }
  .icon-list {
    grid-template-columns: 1fr;
  }
}

/* ===== 모바일 최적화 (768px 이하) ===== */
@media (max-width: 768px) {
  .container {
    padding: 16px 12px;
  }
  
  .nav-inner {
    padding: 8px 12px;
  }
  
  .brand img {
    width: 32px;
    height: 32px;
  }
  
  .brand .title {
    font-size: 16px;
  }
  
  .menu {
    gap: 6px;
  }
  
  .menu a, .dropbtn {
    padding: 6px 10px;
    font-size: 13px;
  }
  
  .hero h1 {
    font-size: 24px;
    line-height: 1.3;
  }
  
  .hero p {
    font-size: 15px;
    line-height: 1.5;
  }
  
  .card {
    padding: 14px;
    border-radius: 12px;
  }
  
  .section {
    padding: 20px 0;
  }
  
  .section h2 {
    font-size: 20px;
    margin-bottom: 12px;
  }
  
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .announcement-card {
    padding: 16px;
  }
  
  .announcement-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  
  .announcement-tags {
    margin-top: 8px;
  }
  
  .cta {
    display: flex;
    flex-direction: column;
    gap: 10px;
  }
  
  .cta .button {
    width: 100%;
    text-align: center;
  }
  
  .flow {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  
  .flow .step {
    padding: 10px 8px;
  }
  
  .flow .step .icon {
    width: 24px;
    height: 24px;
  }
  
  .kv {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  
  .slim {
    padding-left: 16px;
  }
}

/* ===== 작은 모바일 최적화 (480px 이하) ===== */
@media (max-width: 480px) {
  .container {
    padding: 12px 8px;
  }
  
  .nav-inner {
    padding: 6px 8px;
  }
  
  .brand img {
    width: 28px;
    height: 28px;
  }
  
  .brand .title {
    font-size: 14px;
  }
  
  .menu {
    gap: 4px;
  }
  
  .menu a, .dropbtn {
    padding: 5px 8px;
    font-size: 12px;
  }
  
  .hero h1 {
    font-size: 22px;
  }
  
  .hero p {
    font-size: 14px;
  }
  
  .card {
    padding: 12px;
    border-radius: 10px;
  }
  
  .section h2 {
    font-size: 18px;
  }
  
  .tag {
    padding: 5px 8px;
    font-size: 11px;
  }
  
  .button {
    padding: 8px 12px;
    font-size: 14px;
  }
  
  .announcement-card {
    padding: 14px;
  }
  
  .announcement-card h3 {
    font-size: 15px;
  }
  
  .announcement-card p {
    font-size: 13px;
  }
  
  .dropdown-content {
    min-width: 200px;
    left: -20px;
  }
  
  .dropdown-content a {
    padding: 8px 10px;
    font-size: 13px;
  }
}

/* ===== 라이트 테마 ===== */
@media (prefers-color-scheme: light) {
  :root {
    --bg: #e8f0ff;
    --text: #050812;
    --muted: #52607a;
    --primary: #1e3a8a;
    --panel: #ffffff;
    --line: #c7d6f0;
    --nav-bg: rgba(255,255,255,.98);
    --nav-border: #c7d6f0;
    --card-bg: #ffffff;
    --card-border: #c7d6f0;
    --button-hover: #1e40af;
    --badge-bg: #f0f4ff;
    --badge-border: #b8c7e0;
    --badge-text: #1e3a8a;
    --tag-bg: #f0f4ff;
    --tag-border: #b8c7e0;
    --tag-text: #1e3a8a;
  }
  
  /* 라이트 테마 특별 스타일 */
  nav { 
    background: var(--nav-bg); 
    border-bottom: 1px solid var(--nav-border); 
  }
  .menu a, .dropbtn { 
    border-color: #c7d6f0; 
    color: #1e3a8a; 
    background: #ffffff; 
  }
  .menu a:hover, .dropbtn:hover { 
    background: #f0f4ff; 
  }
  .dropdown-content { 
    background: var(--panel); 
    border-color: var(--line);
    box-shadow: 0 12px 28px rgba(19,41,89,.14);
  }
  .dropdown-content a { 
    color: #1e3a8a; 
  }
  .dropdown-content a:hover { 
    background: #f0f4ff; 
  }
  .hero { 
    background: radial-gradient(700px 340px at 80% -10%, rgba(30,58,138,.35), transparent 60%); 
  }
  .kv { 
    color: #1e3a8a; 
  }
  .slim { 
    color: #374151; 
  }
  .notice { 
    color: #6b7a93; 
  }
  .footer { 
    border-top-color: var(--line); 
    color: #1e3a8a; 
  }
}

/* ===== 공지사항 스타일 ===== */
.announcements-container {
  display: grid;
  gap: 16px;
  margin-bottom: 20px;
}

.announcement-card {
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  cursor: pointer;
}

.announcement-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.announcement-card.priority-high {
  border-left: 4px solid #ef4444;
  background: linear-gradient(135deg, var(--card-bg) 0%, rgba(239, 68, 68, 0.05) 100%);
}

.announcement-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.announcement-badge {
  padding: 4px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.announcement-badge.priority-high {
  background: #fef2f2;
  color: #dc2626;
  border: 1px solid #fecaca;
}

.announcement-badge:not(.priority-high) {
  background: var(--badge-bg);
  color: var(--badge-text);
  border: 1px solid var(--badge-border);
}

.announcement-date {
  font-size: 12px;
  color: var(--muted);
  font-family: monospace;
}

.announcement-card h3 {
  margin: 0 0 12px 0;
  font-size: 16px;
  color: var(--text);
  font-weight: 600;
}

.announcement-card p {
  display: none; /* 내용 숨김 - 제목만 표시 */
}

.announcement-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.announcement-tags .tag {
  font-size: 11px;
  padding: 4px 8px;
}

.announcements-more {
  text-align: center;
  margin-top: 20px;
}

/* 라이트 테마에서 공지사항 스타일 조정 */
@media (prefers-color-scheme: light) {
  .announcement-card.priority-high {
    background: linear-gradient(135deg, #ffffff 0%, rgba(239, 68, 68, 0.03) 100%);
  }
  
  .announcement-badge.priority-high {
    background: #fef2f2;
    color: #dc2626;
    border: 1px solid #fecaca;
  }
}

/* ===== 비디오 섹션 스타일 ===== */
.video-container {
  display: grid;
  gap: 24px;
  grid-template-columns: 1fr 1fr;
  align-items: start;
}

.video-wrapper {
  position: relative;
  width: 100%;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 8px 25px rgba(0,0,0,0.1);
  min-height: 315px;
}

.video-wrapper iframe {
  width: 100%;
  height: 315px; /* 고정 높이 설정 */
  min-height: 200px;
  border: none;
  display: block;
}

.video-info {
  padding: 20px;
  background: var(--card-bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  min-height: auto;
  height: fit-content;
}

.video-info h3 {
  margin: 0 0 12px 0;
  color: var(--text);
  font-size: 20px;
}

.video-info p {
  margin: 0 0 16px 0;
  line-height: 1.6;
  color: var(--text);
  opacity: 0.9;
}

.video-features {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.feature-tag {
  padding: 6px 12px;
  background: var(--badge-bg);
  border: 1px solid var(--badge-border);
  border-radius: 20px;
  font-size: 12px;
  color: var(--badge-text);
  font-weight: 500;
}

/* 반응형 비디오 레이아웃 */
@media (max-width: 768px) {
  .video-container {
    grid-template-columns: 1fr;
  }
  
  .video-info {
    order: -1; /* 모바일에서는 정보를 위에 표시 */
  }
}

/* 비디오 대체 콘텐츠 스타일 */
.video-fallback {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 315px;
  background: var(--card-bg);
  border: 2px dashed var(--line);
  border-radius: 16px;
}

.fallback-content {
  text-align: center;
  padding: 20px;
}

.fallback-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.fallback-content h4 {
  margin: 0 0 8px 0;
  color: var(--text);
  font-size: 18px;
}

.fallback-content p {
  margin: 0 0 16px 0;
  color: var(--muted);
  font-size: 14px;
}

/* 라이트 테마에서 비디오 스타일 조정 */
@media (prefers-color-scheme: light) {
  .video-wrapper {
    background: #ffffff;
    border-color: #e5eaf3;
  }
  
  .video-info {
    background: #ffffff;
    border-color: #e5eaf3;
  }
  
  .feature-tag {
    background: #ffffff;
    border-color: #dbe4f6;
    color: #204080;
  }
  
  .video-fallback {
    background: #ffffff;
    border-color: #e5eaf3;
  }
}

/* ===== 스마트 제조 특별 스타일 ===== */
.section.smart-manufacturing {
  background-color: transparent;
}
.flow {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(7, 1fr);
}
.flow .step {
  text-align: center;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 10px;
}
.flow .step .icon {
  width: 28px;
  height: 28px;
  margin: 0 auto 6px;
  display: block;
}
.flow .arrow {
  display: none;
}
@media (min-width: 900px) {
  .flow {
    grid-template-columns: repeat(13, 1fr);
    align-items: center;
  }
  .flow .step {
    grid-column: span 2;
  }
  .flow .arrow {
    display: block;
    text-align: center;
    color: #9ab0d1;
  }
}
.grid-3 {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, 1fr);
}
.grid-2 {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, 1fr);
}
@media (max-width: 900px) {
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
}
  .mes-diagram {
    padding: 14px;
    border: 1px dashed #b8c7e0;
    border-radius: 14px;
    background: #f0f4ff;
  }
.mes-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.mes-node {
  flex: 1 1 160px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  text-align: center;
}
  .caption {
    color: #1e3a8a;
    font-size: 13px;
    margin-top: 6px;
  }