/* Google Fonts: Noto Sans KR, Roboto Mono */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700&family=Roboto+Mono:wght@400;700&display=swap');

/* --- [변수] 디자인 시스템 --- */
:root {
  --bg-color: #0a0e14;
  --surface-color: #1a202c;
  --primary-color: #3A79F7; /* 진한 파랑 */
  --primary-hover: #2563EB;
  --secondary-color: #2d3748;
  --text-color: #e2e8f0;
  --text-muted: #a0aec0;
  --border-color: #2a344e;
  --font-primary: 'Noto Sans KR', sans-serif;
  --font-mono: 'Roboto Mono', monospace;
}

/* --- [초기화] 기본 스타일 --- */
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-primary);
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  line-height: 1.6;
  font-size: 1.5rem;
}
a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover {
  color: var(--primary-hover);
}

/* --- [네비게이션 바] --- */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(26, 32, 44, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.3s ease;
  overflow: hidden;
}
.main-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../assets/images/header-bg.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.05;
  z-index: -1;
}
.logo {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: #fff;
  text-decoration: none;
}
.logo span {
  color: var(--primary-color);
}
.main-nav {
  display: flex;
  align-items: center;
  flex-grow: 1;
  justify-content: center;
}
.main-nav a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  margin: 0 1.2rem;
  transition: color 0.2s ease;
}
.main-nav a:hover,
.main-nav a.active {
  color: #fff;
}
.user-nav {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  justify-content: flex-end;
  gap: 1rem;
}
.user-nav a {
  font-size: 0.9rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.user-nav .btn-login {
  background-color: var(--primary-color);
  color: #fff;
  padding: 0.5rem 1.2rem;
  border-radius: 5px;
  font-weight: 700;
  transition: background-color 0.2s ease;
}
.user-nav .btn-login:hover {
  background-color: var(--primary-hover);
}
.user-nav a.username-display strong {
  color: var(--primary-color);
}

/* --- [히어로 섹션] --- */
.hero {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  background-image:
    linear-gradient(rgba(10, 14, 20, 0.85), rgba(10, 14, 20, 0.5)),
    url('../assets/images/forensic1.jpg');
  background-size: cover;
  background-position: center;
}
.hero-title {
  font-family: var(--font-mono);
  font-size: 5rem;
  font-weight: 700;
  color: #fff;
  margin: 0;
  letter-spacing: -2px;
}
.hero-title span {
  color: var(--primary-color);
}
.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 300;
  color: var(--text-muted);
  margin: 1rem 0 2rem 0;
  max-width: 600px;
}
.hero .scroll-down-btn {
  font-size: 1rem;
  font-weight: 500;
  color: #fff;
  border: 2px solid var(--primary-color);
  padding: 0.8rem 2rem;
  border-radius: 50px;
  transition: all 0.3s ease;
}
.hero .scroll-down-btn:hover {
  background-color: var(--primary-color);
  transform: translateY(-5px);
}

/* --- [강의 목록] --- */
.lecture-section {
  padding: 6rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}
.section-header h2 {
  font-size: 2.5rem;
  font-weight: 700;
  color: #fff;
}
.section-header p {
  color: var(--text-muted);
  font-size: 1.1rem;
}
.lecture-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2.5rem;
}
/* 기존 .lecture-card 수정 */
.lecture-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  transition: all 0.5s cubic-bezier(0.2, 0.8, 0.2, 1); /* 애니메이션 속도 개선 */
  opacity: 0;
  transform: translateY(30px);
}
/* 추가: 호버 시 약간의 입체감 부여 */
.lecture-card:hover {
  border-color: var(--primary-color);
  transform: translateY(-5px); 
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.lecture-card.visible {
  opacity: 1;
  transform: translateY(0);
}
.lecture-card-content {
  padding: 2rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}
.lecture-card h3 {
  font-size: 1.5rem;
  font-weight: 500;
  color: #fff;
  margin-bottom: 0.5rem;
}
.lecture-card p {
  color: var(--text-muted);
  font-size: 1rem;
  flex-grow: 1;
}
.lecture-card .view-btn {
  align-self: flex-start;
  color: var(--primary-color);
  font-weight: 700;
  margin-top: 1.5rem;
}
.lecture-card .view-btn:hover span {
  text-decoration: underline;
}

/* --- [콘텐츠 페이지] --- */
.page-container {
  padding-top: 80px;
}
/* .content-wrapper의 max-width는 lecture.php에서 조정되었으므로 900px로 유지 */
.content-wrapper {
  max-width: 900px;
  margin: 3rem auto;
}
.content-header {
  padding: 3rem 0;
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 3rem;
}
.content-header h2 {
  font-size: 3rem;
  color: #fff;
  margin: 0;
  line-height: 1.3;
}
.content-header .subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 700px;
  margin: 1rem auto 0 auto;
}
/* --- 회색 배경 영역 (콘텐츠 본문) 수정 --- */
.content-body {
  background-color: var(--surface-color);
  border-radius: 12px;
  /* 상단 패딩을 2rem으로 줄이고 (여백 축소), 하단 패딩은 10rem 유지 */
  padding: 2rem 3rem 10rem 3rem;
  /* 기본 글씨 크기를 1.3rem으로 키움 */
  font-size: 1.3rem; 
}
.content-body .description {
  /* 부모 요소(1.3rem) 대비 1.2배로 설정하여 글씨 크기 증가 */
  font-size: 1.2em; 
  line-height: 1.8;
  color: var(--text-muted);
}
.download-area {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}
.download-area h3 {
  font-size: 1.5rem;
  color: #fff;
}
.btn-download,
.btn-disabled {
  display: inline-block;
  padding: 1rem 2.5rem;
  border-radius: 8px;
  font-weight: 700;
  font-size: 1.1rem;
}
.btn-download {
  background-color: var(--primary-color);
  color: #fff;
}
.btn-download:hover {
  transform: scale(1.05);
  background-color: var(--primary-hover);
}
.btn-disabled {
  background-color: var(--secondary-color);
  color: var(--text-muted);
}
.back-link {
  display: block;
  margin-top: 3rem;
  color: var(--text-muted);
  text-align: center;
}

/* --- [소개 페이지] --- */
.intro-content p {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--text-muted);
}
.intro-content strong {
  color: var(--primary-color);
}
.features-section {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 4rem;
  text-align: center;
}
.feature-item {
  background-color: var(--surface-color);
  padding: 2rem;
  border-radius: 12px;
}
.feature-item h3 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin: 1rem 0 0.5rem 0;
}
.feature-item p {
  color: var(--text-muted);
}
.feature-item svg {
  width: 50px;
  height: 50px;
  stroke: var(--primary-color);
}

/* --- [로그인/회원가입 폼] --- */
.form-page {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem 1rem;
  overflow-y: auto;
}
.form-container {
  width: 100%;
  max-width: 450px;
  background-color: var(--surface-color);
  padding: 3rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}
.form-container h2 {
  text-align: center;
  color: #fff;
  font-size: 2rem;
  margin-bottom: 2rem;
}
.form-container button {
  width: 100%;
  padding: 15px;
  background-color: var(--primary-color);
  color: #fff;
  border-radius: 5px;
  font-weight: 700;
  font-size: 1.1em;
}
.form-container button:hover {
  background-color: var(--primary-hover);
}
.form-links {
  text-align: center;
  margin-top: 1.5rem;
}
.input-group {
  margin-bottom: 1.5rem;
}
.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}
.input-group input {
  width: 100%;
  padding: 12px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  color: var(--text-color);
}
.input-group input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(58, 121, 247, 0.3);
}
.error {
  color: #ff4d4d;
  background-color: rgba(255, 77, 77, 0.1);
  border: 1px solid #ff4d4d;
  border-radius: 5px;
  padding: 1rem;
  margin-bottom: 1.5rem;
}
.success {
  color: #33cc33;
  background-color: rgba(51, 204, 51, 0.1);
  border: 1px solid #33cc33;
  border-radius: 5px;
  padding: 1rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

/* --- [푸터] --- */
.main-footer {
  text-align: center;
  padding: 2rem;
  margin-top: 4rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
}
/* --- [게시판] 섹션 최종 수정 --- */

/* 게시판 하단 컨트롤: 페이지네이션과 글쓰기 버튼을 같은 줄에 배치 */
.board-footer-controls {
    max-width: 1100px;
    margin: 2rem auto 4rem auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between; 
    align-items: center;
}

/* 페이지네이션 컨테이너 */
.pagination {
  margin-top: 0; 
  display: flex;
  justify-content: center; 
}

.pagination-list {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
  border-radius: 8px;
  overflow: hidden; 
}

.page-item {
  margin: 0;
}

.page-link {
  display: block;
  padding: 0.7rem 1.1rem;
  background-color: var(--surface-color);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  border-left: none; 
  font-weight: 500;
  transition: all 0.2s ease;
}

/* 첫 번째 요소의 왼쪽 경계는 유지 */
.pagination-list .page-item:first-child .page-link {
  border-left: 1px solid var(--border-color);
  border-top-left-radius: 8px;
  border-bottom-left-radius: 8px;
}
/* 마지막 요소의 오른쪽 경계는 유지 */
.pagination-list .page-item:last-child .page-link {
  border-top-right-radius: 8px;
  border-bottom-right-radius: 8px;
}

.page-link:hover {
  background-color: var(--secondary-color);
  color: var(--text-color);
}

/* 활성 페이지 */
.page-item.active .page-link {
  background-color: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
  z-index: 1; 
}

/* 활성 페이지는 호버 효과 제거 */
.page-item.active .page-link:hover {
  background-color: var(--primary-color);
  color: #fff;
}

/* --- [게시판] --- */
.board-section {
  padding-top: 120px;
  max-width: 1100px;
  margin: 0 auto;
}
.board-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}
.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  font-weight: 700;
  transition: all 0.2s ease;
}
.btn-primary {
  background-color: var(--primary-color);
  color: #fff;
}
.btn-primary:hover {
  transform: scale(1.05);
  background-color: var(--primary-hover);
}
.board-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
}
.board-table thead {
  border-bottom: 2px solid var(--border-color);
}
.board-table th {
  padding: 1rem;
  color: var(--text-muted);
  font-weight: 500;
}
.board-table tbody tr {
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s ease;
}
.board-table tbody tr:hover {
  background-color: rgba(45, 55, 72, 0.3);
}
.board-table td {
  padding: 1.2rem 1rem;
}
.board-table .col-title {
  text-align: left;
}
.board-table .col-title a {
  color: var(--text-color);
}
.board-table .col-title a:hover {
  color: var(--primary-color);
}
.board-table .col-author {
  color: var(--text-muted);
}
.tag-notice {
  background-color: var(--primary-color);
  color: #fff;
  padding: 0.2rem 0.5rem;
  border-radius: 5px;
  font-size: 0.8rem;
  font-weight: 700;
  margin-right: 0.5rem;
}

/* --- [게시글 상세/작성] 섹션 최종 수정 --- */

/* 1. 글쓰기 폼 컨테이너 너비 고정 */
.post-write-page .post-container {
    max-width: 800px; /* 전체 폼 컨테이너 너비를 고정 */
    margin: 3rem auto;
    border-radius: 12px; /* 전체 컨테이너에 둥근 모서리 적용 */
    border: 1px solid var(--border-color); /* 테두리 추가 */
    overflow: hidden; /* 자식 요소의 둥근 모서리 관리를 위해 오버플로우 숨김 */
}

/* 2. 글쓰기 페이지 헤더 스타일 통일 (파란색 배경 강제) */
.post-write-page .section-header {
    /* 일반 .section-header 스타일을 덮어씁니다. */
    background-color: var(--primary-color); 
    color: #fff; 
    padding: 3rem 2rem; 
    margin-bottom: 0; /* 폼 본체와 붙도록 마진 제거 */
    border-bottom: none; /* 하단 경계선 제거 */
    text-align: left;
}
.post-write-page .section-header h2 {
    color: #fff;
    font-size: 2.5rem;
    margin: 0;
}

/* 3. 폼 본체 스타일 조정 */
.write-form {
    font-size: 1.2rem; 
    /* .post-container와 결합된 상태에서만 사용됨 */
    background-color: var(--surface-color);
    padding: 2rem;
    /* .post-container가 테두리를 가지므로, 폼 자체의 테두리는 제거 */
    border: none; 
    border-radius: 0; /* 폼은 둥근 모서리를 가지지 않음 */
    max-width: none; /* .post-container가 이미 max-width를 가짐 */
    margin: 0;
    
    /* 폼 요소 스타일 유지 */
    width: 100%;
}

.write-form label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}


.write-form input,
.write-form textarea {
  width: 100%;
  padding: 12px;
  margin-bottom: 1.5rem;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: 5px;
  color: var(--text-color);
  /* min-height를 공통으로 지정하지 않고, input에만 별도로 지정합니다. */
}

/* --- 추가된 부분: input (제목 입력 필드)의 높이를 일반적인 크기로 재설정 --- */
.write-form input[type="text"] {
    /* 제목 필드의 높이를 내용 필드(textarea)의 min-height와 분리 */
    min-height: 50px; /* 기본값으로 설정 (padding으로 인해 적절한 높이가 됨) */
    height: auto;
}

/* --- 내용 입력 필드 (textarea)는 400px로 유지 --- */
.write-form textarea {
  min-height: 400px; /* 400px 유지 */
  resize: vertical;
}

/* 게시글 상세 페이지의 글씨 크기도 증가 */
.post-content {
    font-size: 1.2rem; 
    color: var(--text-color);
    line-height: 1.8;
    margin-bottom: 2rem;
}

.post-actions {
    display: flex;
    justify-content: flex-end; /* 버튼을 오른쪽으로 정렬 */
    gap: 1rem;
    margin-top: 1rem;
}
/* '등록하기' 버튼 */
.write-form button[type="submit"] {
  width: auto; /* width: 100% 대신 auto로 변경 */
  padding: 1rem 2rem;
  border: none;
  cursor: pointer;
  background-color: var(--primary-color);
  color: #fff;
  border-radius: 5px;
  font-weight: 700;
  font-size: 1rem;
  transition: background-color 0.2s ease;
}
.write-form button[type="submit"]:hover {
  background-color: var(--primary-hover);
}
/* '취소' 버튼 (a 태그) */
.write-form .btn {
  padding: 1rem 2rem;
  background-color: var(--secondary-color);
  color: var(--text-color) !important;
  font-weight: 700;
  border-radius: 5px;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.2s ease;
}
.write-form .btn:hover {
  background-color: #4a5568;
}

/* 기존 post-container 스타일 유지 */
.post-container {
  max-width: 900px; /* 일반적인 게시글 상세 페이지를 위해 남겨둠 */
  margin: 3rem auto;
}

/* --- [게시글 상세 + 댓글] --- */
/* (post-content 스타일 위에서 수정됨) */
.post-header {
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 2rem;
}
.post-header h2 {
  font-size: 2rem;
  color: #fff;
}
.post-meta {
  color: var(--text-muted);
  font-size: 0.9rem;
}
.comment-section {
  margin-top: 3rem;
}
.comment-section h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}
.comment {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
}
.comment-author {
  font-weight: 700;
  color: var(--primary-color);
}
.comment-body {
  color: var(--text-color);
  margin-top: 0.5rem;
}
.comment-form textarea {
  width: 100%;
  padding: 12px;
  border-radius: 5px;
  background-color: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  resize: vertical;
  min-height: 100px;
}
.comment-form button {
  margin-top: 1rem;
  padding: 0.8rem 1.5rem;
  background-color: var(--primary-color);
  color: #fff;
  border-radius: 5px;
  font-weight: 700;
}
.comment-form button:hover {
  background-color: var(--primary-hover);
}

/* --- [강의 상세 페이지] : 학습 공간 레이아웃 수정 --- */

/* 사이드바 스크롤바 제거 및 sticky 기능 유지 */
.lecture-wrapper {
  display: flex;
  gap: 2rem;
  align-items: flex-start;
  padding-top: 1rem; 
  max-width: 1400px; 
  margin: 0 auto;
}
.lecture-sidebar {
  flex-basis: 300px;
  flex-shrink: 0;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  position: sticky;
  top: 100px; 
  max-height: none; 
  overflow-y: visible; 
}

.lecture-sidebar .course-title {
  font-size: 1.6rem;
  color: var(--primary-color);
  margin-top: 0;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-color);
}
/* 아코디언 스타일 */
.accordion-item {
    margin-bottom: 5px;
    border-radius: 6px;
    overflow: hidden;
}

.section-header {
    width: 100%;
    background-color: var(--secondary-color);
    color: var(--text-color);
    border: none;
    padding: 0.8rem 1rem;
    text-align: left;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s ease;
    border-radius: 6px;
}

.section-header:hover {
    background-color: #4a5568; 
}

.accordion-icon {
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--text-color);
    transition: transform 0.3s ease;
}

.section-header.expanded .accordion-icon {
    transform: rotate(180deg);
}
.section-header.expanded {
    background-color: var(--primary-color);
    color: #fff;
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
}
.lecture-content {
  flex-grow: 1;
}

.lecture-content .content-body {
  padding: 3rem 3rem; /* 강의 상세 콘텐츠의 상하 패딩 유지 (10rem) */
}
.lecture-content .lecture-text-content h3 {
    font-size: 2rem;
    color: #fff;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}
/* 아코디언 콘텐츠 (유닛 목록) */
.section-content {
    background-color: var(--surface-color);
    padding: 0 1rem;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease-out, padding 0.4s ease-out; 
    border-left: 1px solid var(--primary-color);
    border-right: 1px solid var(--primary-color);
    border-bottom: 1px solid var(--primary-color);
    border-bottom-left-radius: 6px;
    border-bottom-right-radius: 6px;
}
.section-content.expanded {
    padding: 0.5rem 1rem 1rem 1rem; 
}

/* 유닛 링크 스타일 */
.section-content .unit-link {
    display: block; 
    padding: 0.5rem 0;
    margin-left: 0.5rem;
    white-space: normal; 
    word-wrap: break-word; 
    line-height: 1.4; 
    font-size: 1.05rem;
}

/* 기존 .unit-link 스타일 재정의 */
.unit-link {
    display: block; 
    padding: 0.8rem 1rem;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 400;
    border-radius: 6px;
    transition: all 0.2s ease;
    white-space: normal; 
    word-wrap: break-word;
    line-height: 1.4; 
}

.section-content .unit-link.active {
    background-color: transparent; 
    color: var(--primary-color);
    font-weight: 700;
}
.section-content .unit-link:last-child {
    padding-bottom: 1rem; 
}
.unit-link:hover {
  color: var(--text-color);
  padding-left: 5px; 
}

.lecture-sidebar .section-divider {
    font-size: 0.9rem;
    color: var(--text-color);
    font-weight: 500;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px dashed var(--secondary-color);
}
.unit-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}
.unit-navigation .btn {
    padding: 0.8rem 1.5rem;
    font-weight: 500;
}
.unit-navigation .btn-prev {
    background-color: var(--secondary-color);
    color: var(--text-color);
}
.unit-navigation .btn-next {
    background-color: var(--primary-color);
    color: #fff;
}
.unit-navigation .btn-next:hover {
    background-color: var(--primary-hover);
}
.unit-navigation .btn-prev:hover {
    background-color: #4a5568; 
}

/* --- [반응형] --- */
@media (max-width: 992px) {
  .lecture-wrapper {
    flex-direction: column;
  }
  .lecture-sidebar {
    width: 100%;
    max-height: none; 
    position: static;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }
  .hero-subtitle {
    font-size: 1.2rem;
  }
  .lecture-grid {
    grid-template-columns: 1fr;
  }
  .features-section {
    grid-template-columns: 1fr;
  }
  .main-header {
    flex-direction: column;
    align-items: flex-start;
  }
  .main-nav {
    margin-top: 0.5rem;
    flex-wrap: wrap;
    justify-content: flex-start;
  }
}

/* --- [포렌식 도구 목록] 섹션 추가 --- */
.forensic-tool-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 2rem 0;
}

.tool-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    transition: all 0.3s ease;
}

.tool-card:hover:not(.disabled) {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.tool-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.tool-card p {
    color: var(--text-muted);
    min-height: 50px;
    flex-grow: 1;
    margin-bottom: 1.5rem;
}

.tool-card .btn {
    margin-top: auto;
    width: 100%;
    text-align: center;
}

.tool-card .btn-secondary {
    background-color: var(--secondary-color);
    color: var(--text-muted);
    cursor: default;
}

.tool-card.disabled {
    opacity: 0.5;
    pointer-events: none;
    cursor: not-allowed;
}

.tool-card.disabled h3 {
    color: var(--text-muted);
}