:root {
  --green-900: #0b3d2e; /* 정글 딥그린 */
  --green-800: #115c43;
  --green-700: #167552;
  --green-600: #1e8c63;
  --green-500: #27a275; /* 포인트 그린 */
  --green-400: #4fbe94;
  --green-300: #7ad7b2; /* 연두 */
  --green-200: #b6ead6; /* 민트빛 연그린 */
  --green-100: #e6fbf3; /* 매우 옅은 배경 */
  --tea-300: #b7c79b; /* 녹차톤 보조 */
  --text-900: #0f1a17;
  --text-700: #27423b;
  --text-500: #496a62;
  --white: #ffffff;
  --shadow: 0 6px 20px rgba(16, 48, 38, 0.15);
  --radius: 12px;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: "Pretendard", "Apple SD Gothic Neo", Roboto, Arial, sans-serif;
  color: var(--text-900);
  background: linear-gradient(180deg, var(--green-100), #fff);
}

/* 헤더 */
.app-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--white);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  box-shadow: var(--shadow);
}
.brand { display: flex; align-items: center; gap: 10px; }
.logo { font-size: 22px; }
.title { margin: 0; font-size: 18px; color: var(--green-800); }
.top-nav { display: flex; gap: 8px; }
.nav-btn {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--green-300);
  background: var(--white);
  color: var(--green-700);
  cursor: pointer;
}
.nav-btn.primary { background: var(--green-500); color: var(--white); border-color: var(--green-500); }

/* 메인 레이아웃 */
.app-main {
  display: grid;
  grid-template-columns: 240px 1fr 300px;
  gap: 16px;
  max-width: 1200px;
  margin: 16px auto;
  padding: 0 16px;
}

/* 사이드바 */
.sidebar {
  background: var(--white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow);
}
.menu { list-style: none; padding: 0; margin: 0; }
.menu-section { margin: 12px 8px 6px; font-size: 12px; color: var(--text-500); }
.menu-link {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--text-900);
  text-decoration: none;
}
.menu-link:hover { background: var(--green-100); }
.menu-link.is-active { background: var(--green-300); color: var(--green-900); }

/* 콘텐츠 */
.content {
  min-height: 60vh;
  background: var(--white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
}
.content-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 10px; }
.channel-title { margin: 0; font-size: 18px; color: var(--green-800); }
.actions { display: flex; gap: 8px; }
.action-btn {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid var(--green-300);
  background: var(--tea-300);
  color: var(--green-900);
  cursor: pointer;
}

/* 메시지 리스트 */
.message-list { display: flex; flex-direction: column; gap: 12px; }
.message { display: grid; grid-template-columns: 40px 1fr; gap: 10px; }
.avatar { width: 40px; height: 40px; display: grid; place-items: center; background: var(--green-300); border-radius: 10px; }
.bubble { background: #f9fffc; border: 1px solid var(--green-200); border-radius: 12px; padding: 10px; }
.meta { display: flex; gap: 8px; font-size: 12px; color: var(--text-700); margin-bottom: 4px; }
.nick { color: var(--green-700); font-weight: 600; }
.text { margin: 0; line-height: 1.5; }
.reactions { display: flex; gap: 6px; margin-top: 6px; }
.react { padding: 4px 8px; border-radius: 999px; border: 1px solid var(--green-200); background: var(--white); color: var(--green-700); cursor: pointer; }

/* 작성창 */
.composer { display: grid; grid-template-columns: 1fr auto; gap: 8px; margin-top: 12px; }
.input { padding: 10px 12px; border: 1px solid var(--green-300); border-radius: 10px; outline: none; }
.input:focus { border-color: var(--green-500); box-shadow: 0 0 0 3px rgba(39,162,117,0.15); }
.send { padding: 10px 16px; border-radius: 10px; border: none; background: var(--green-500); color: var(--white); cursor: pointer; }

/* 오른쪽 패널 */
.rightbar { display: flex; flex-direction: column; gap: 12px; }
.panel {
  background: var(--white);
  border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius);
  padding: 12px;
  box-shadow: var(--shadow);
}
.panel-title { margin: 0 0 8px; font-size: 14px; color: var(--green-800); }
.panel-text { margin: 0; color: var(--text-700); }
.profile { display: flex; align-items: center; gap: 10px; }
.profile-avatar { width: 40px; height: 40px; display: grid; place-items: center; background: var(--green-400); border-radius: 10px; }
.profile-nick { font-weight: 700; color: var(--green-800); }
.profile-id { font-size: 12px; color: var(--text-500); }

/* 푸터 */
.app-footer { max-width: 1200px; margin: 20px auto; padding: 10px 16px; color: var(--text-500); }

/* 반응형 */
@media (max-width: 1100px) {
  .app-main { grid-template-columns: 220px 1fr; }
  .rightbar { display: none; }
}
@media (max-width: 760px) {
  .app-main { grid-template-columns: 1fr; }
  .sidebar { order: 2; }
  .content { order: 1; }
  .top-nav { display: none; }
  .app-header { position: static; }
}

/* 게시판 탭 */
.board-tabs { display: flex; gap: 8px; margin-bottom: 10px; }
.tab {
  padding: 6px 12px;
  border: 1px solid var(--green-300);
  background: var(--white);
  color: var(--green-800);
  border-radius: 8px;
  cursor: pointer;
}
.tab.is-active { background: var(--green-500); color: var(--white); border-color: var(--green-500); }

/* 툴바 */
.board-toolbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.count-select { padding: 6px 10px; border: 1px solid var(--green-300); border-radius: 8px; }
.write-btn { padding: 8px 12px; border-radius: 8px; border: none; background: var(--green-700); color: var(--white); cursor: pointer; }

/* 테이블 */
.board-table-wrapper { border: 1px solid rgba(0,0,0,0.06); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); background: var(--white); }
.board-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.board-table thead { background: #f6fbf8; color: var(--text-700); }
.board-table th, .board-table td { padding: 10px 12px; border-bottom: 1px solid rgba(0,0,0,0.06); text-align: left; }
.board-table th { font-weight: 600; }
.board-table .title-cell a { color: var(--text-900); text-decoration: none; }
.board-table .title-cell a:hover { text-decoration: underline; }
.board-table .count { color: var(--green-700); }
.board-table .preview { font-size: 12px; color: var(--text-700); margin-top: 2px; }
.board-table td:last-child, .board-table th:last-child { text-align: right; }
.board-table tr.notice td { background: #fbfffd; font-weight: 600; }
.board-table tr:hover td { background: var(--green-100); }

@media (max-width: 760px) {
  .board-table th:nth-child(1),
  .board-table td:nth-child(1),
  .board-table th:nth-child(2),
  .board-table td:nth-child(2),
  .board-table th:nth-child(6),
  .board-table td:nth-child(6),
  .board-table th:nth-child(7),
  .board-table td:nth-child(7) { display: none; }
}

/* 데스크탑 최적화 */
@media (min-width: 1024px) {
  .app-main { max-width: 1200px !important; }
  .content { padding: 18px; }
  .board-tabs { margin-bottom: 14px; }
  .tab { padding: 8px 14px; }
  .board-toolbar { margin-bottom: 14px; }
  .board-table { font-size: 15px; }
  .board-table th, .board-table td { padding: 12px 14px; }
  /* 현재 컬럼 순서: 1) 작성일 2) 제목 3) 글쓴이 4) 조회 5) 추천 6) 댓글 */
  .board-table thead th:nth-child(1),
  .board-table tbody td:nth-child(1) { width: 130px; text-align: center; }
  .board-table thead th:nth-child(2),
  .board-table tbody td:nth-child(2) { width: auto; }
  .board-table thead th:nth-child(3),
  .board-table tbody td:nth-child(3) { width: 160px; }
  .board-table thead th:nth-child(4),
  .board-table tbody td:nth-child(4) { width: 90px; text-align: right; }
  .board-table thead th:nth-child(5),
  .board-table tbody td:nth-child(5) { width: 90px; text-align: right; }
  .board-table thead th:nth-child(6),
  .board-table tbody td:nth-child(6) { width: 90px; text-align: right; }
  .board-table .title-cell a { display: inline-block; max-width: 100%; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
}