:root {
    --primary-color: #00D26A;
    --background-color: #0A0F1C;
    --text-color: #FFFFFF;
    --subtext-color: #AAB1C4;
    --card-bg: #121826;
  }
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  body {
    font-family: 'Inter', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.75;
    padding: 0 1.5rem;
    font-size: 1.125rem;
  }
  section {
    padding-top: clamp(10rem, 20vw, 15rem);
    overflow: hidden;
  }
  
/* header */
  header {
    text-align: center;
    padding: 5rem 0 2rem;
  }
  header h1 {
    font-size: 3rem;
    font-weight: 800;
  }
  .highlight {
    color: var(--primary-color);
  }
  header > *:not(:first-child) {
    padding-top: 1.5rem;
  }
  header img {
    width: 400px;
    max-width: 80%;
    height: auto;
    border-radius: 50%;
    transition: transform 0.3s ease;
  }
  header img:hover {
    transform: translateY(-10px);
  }
  header p {
    margin-top: 1rem;
    color: var(--subtext-color);
  }
  .floating-nav {
    position: sticky;
    top: 20px;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 2rem;
    background-color: #1B2432;
    border-radius: 9999px;
    padding: 0.5rem 2rem;
    margin: 2rem auto;
    width: fit-content;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  }
  .nav-dots {
    display: flex;
    gap: 0.5rem;
  }
  .dot {
    width: clamp(0.4rem, 2vw, 1rem);
    height: clamp(0.4rem, 2vw, 1rem);
    border-radius: 50%;
  }
  .dot.blue { background-color: #007aff; }
  .dot.green { background-color: #34c759; }
  .dot.yellow { background-color: #ffcc00; }
  .nav-items {
    display: flex;
    gap: clamp(1.0em, 0.5vw, 1.5rem);
  }
  .nav-items a {
    color: #aab1c4;
    text-decoration: none;
    font-weight: 600;
    font-size: clamp(0.6rem, 1.5vw, 0.9rem);
    transition: color 0.2s ease;
  }
  .nav-items a:hover {
    color: #ffffff;
  }
  
/* section, 타이틀 정의 */
  section {
    max-width: 768px;
    margin: 3rem auto;
  }
  .section-title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
  }

/* 기술 스택 */
  .skills-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 2rem;
    margin-top: 1rem;
    margin-bottom: 2rem;
    justify-items:center;
  }
  .skill-icon {
    position: relative; 
    aspect-ratio: 1 / 1;
    width: 100%;
    max-width: 80px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .skill-icon img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    position: relative;
    border-radius: 12px;
  }
  .skill-icon img:hover {
    transform: translateY(-10px);
  }
  .skill-icon .tooltip {
    margin-top: 0rem;
    background: #d1d5db;
    color: #111827;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: clamp(0.45rem, 1.5vw, 0.65rem);
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    transform: translateY(0);
    transition: all 0.05s ease;
    pointer-events: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
  }
  .skill-icon:hover .tooltip {
    opacity: 1;
  }
  
/* 경험 사항 */ 
  #experience {
    max-width: 768px;
    padding: 0 1rem;
    text-align: center;
    padding-top: clamp(10rem, 20vw, 15rem);
  }
  .experience-title {
    text-align: center;
    color: var(--primary-color);
    font-weight: 700;
    font-size: clamp(1rem, 3vw, 2rem);
    margin-bottom: 0.5rem;
  }
  .experience-subtitle {
    text-align: center;
    font-size: clamp(1rem, 3vw, 1.5rem);
    font-weight: 600;
    margin-bottom: 2rem;
  }
  .experience-entry {
    display: grid;
    grid-template-columns: 20% 1fr;
    gap: 1rem;
    margin-bottom: 2.5rem;
    align-items: start;
    text-align: left; 
  }
  .experience-year-first {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 500;
    text-align: right; 
    padding-top: 0.2rem;
  }
  .experience-year {
    font-size: 0.9rem;
    color: var(--subtext-color);
    font-weight: 500;
    text-align: right; 
    padding-top: 0.2rem;
  }
  .experience-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }
  .experience-company {
    font-size: clamp(0.8rem, 3vw, 1.1rem);
    font-weight: 700;
  }
  .company-tag {
    font-size: clamp(0.5rem, 3vw, 0.7rem);
    background-color: var(--primary-color);
    color: #fff;
    padding: 0.2rem 0.4rem;
    border-radius: 9999px;
    font-weight: 600;
  }
  .study-tag {
    font-size: 0.7rem;
    background-color: blue;
    color: #fff;
    padding: 0.2rem 0.4rem;
    border-radius: 9999px;
    font-weight: 600;
  }
  .school-tag {
    font-size: 0.7rem;
    background-color: #4F46E5;
    color: #fff;
    padding: 0.2rem 0.4rem;
    border-radius: 9999px;
    font-weight: 600;
  }
  .award-tag {
    font-size: 0.7rem;
    background-color: #F59E0B;
    color: #fff;
    padding: 0.2rem 0.4rem;
    border-radius: 9999px;
    font-weight: 600;
  }
  .hackathon-tag {
    font-size: 0.7rem;
    background-color: #10B981;
    color: #fff;
    padding: 0.2rem 0.4rem;
    border-radius: 9999px;
    font-weight: 600;
  }
  .experience-desc {
    font-size: clamp(0.75rem, 3vw, 0.95rem);
    color: var(--subtext-color);
    line-height: 1.5;
  }
  .tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0.5rem 0;
    /* align-items: center;
    justify-content: center; */
  }
  .tech-stack img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
  }
  .details-link {
    color: var(--primary-color);
    font-size: clamp(0.65rem, 3vw, 0.85rem);
    font-weight: 500;
    text-decoration: none;
    display: inline-block;
    margin-top: 0.3rem;
  }

/* 프로젝트 모달 */
  .project-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 2rem;
    display: none;
  }
  .project-modal.active {
    display: flex;
  }
  .project-modal-content {
    background-color: var(--background-color);
    color: var(--text-color);
    max-width: 800px;
    width: 100%;
    border-radius: 12px;
    padding: 2rem;
    position: relative;
    overflow-y: auto;
    max-height: 90vh;
  }
  .project-modal-content img {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    object-fit: cover;
    display: block;
  }
  .project-modal-content h3 {
    font-size: clamp(1rem, 3vw, 1.75rem);
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: 1.5rem;
    white-space: pre-line;
  }
  .project-modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    color: var(--subtext-color);
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.2s ease;
  }
  .project-modal-close:hover {
    color: #fff;
  }
  .project-card {
    background-color: var(--card-bg);
    padding: 1.75rem;
    border-radius: 12px;
    transition: transform 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    overflow: hidden;
  }
  .project-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
  }
  .project-thumbnail {
    width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 16px;
    margin-bottom: 1rem;
    object-fit: contain;
    background-color: #ffffff;
  }
  .award-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
  }
  .award-badge {
    padding: clamp(0.2rem, 3vw, 0.3rem) clamp(0.5rem, 3vw, 0.7rem);;
    border-radius: 8px;
    font-size: clamp(0.55rem, 3vw, 0.85rem);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    box-shadow: inset 0 1px 2px rgba(255, 255, 255, 0.6),
                0 1px 4px rgba(0, 0, 0, 0.2);
    text-shadow: 0 0 1px rgba(0,0,0,0.2);
    transition: transform 0.2s ease;
  }
  .link-icons {
    display: flex;
    gap: 10px; /* 아이콘 사이 간격 */
    align-items: center;
  }
  .link-icons img {
    width: 24px; /* 필요 시 조절 */
    height: 24px;
  }  
  /* 공통 hover 살짝 튀게 */
  .award-badge:hover {
    transform: scale(1.05);
  }
  /* 금색 배지 */
  .award-badge.gold {
    background: linear-gradient(135deg, #f6d365, #fda085);
    color: #3d2e00;
  }
  /* 은색 배지 */
  .award-badge.silver {
    background: linear-gradient(135deg, #d7d7d7, #eeeeee);
    color: #333;
  }
  /* 동색 배지 */
  .award-badge.bronze {
    background: linear-gradient(135deg, #c97b30, #f2c197);
    color: #fff;
  }
  .modal-section-title,
  .modal-section-title-line {
    font-weight: 700;
    font-size: clamp(0.7rem, 3vw, 1rem);
    color: var(--primary-color);
    padding-bottom: 0.3rem;
    margin-bottom: 0.5rem;
    margin-top: 1.5rem;
  }
  .modal-section-title-content {
    font-size: clamp(0.6rem, 3vw, 0.9rem);
  }
  .modal-section-title-line {
    border-top: 1px solid #444;
    padding-top: 1rem;
    margin-top: 2rem;
  }
  .tech-stack-inline {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
  }
  .tech-stack-inline span {
    background: #1e2533;
    color: #fff;
    padding: 0.3rem 0.6rem;
    border-radius: 6px;
    font-size: clamp(0.55rem, 3vw, 0.85rem);
    font-weight: 500;
  }
  .info-grid {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 0.5rem 1rem;
    margin-bottom: 1.5rem;
    font-size: clamp(0.65rem, 3vw, 0.95rem);
  }
  .info-grid a img {
    width: 32px;
    height: auto;
    border-radius: 8px;
    transition: transform 0.2s ease;
  }
  .info-grid a img:hover {
    transform: scale(1.05);
  }
  .info-grid div:nth-child(odd) {
    font-weight: 400;
    color: var(--subtext-color); 
  }
  .modal-details-list {
    list-style: disc;
    margin-left: 1rem;
    padding-left: 1rem;
    line-height: 1.6;
  }
  .modal-details-list.number {
    list-style-type: decimal;
    padding-left: 1.2rem;
    line-height: 1.8;
  }
  .modal-details-list.number > li {
    margin-bottom: 1rem;
    font-size: clamp(0.75rem, 3vw, 1.05rem);
  }
  .modal-details-list.number ul {
    list-style-type: disc;
    margin-top: 0.5rem;
    padding-left: 1.2rem;
    line-height: 1.6;
  }
  .modal-details-list.number ul li {
    font-size: clamp(0.65rem, 3vw, 0.95rem);
    font-weight: 200;
  }
  
/* 블로그 */ 
  .blog-card-grid {
    display: grid;
    /* grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); */
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
    margin-top: 2rem;
  }
  .blog-card {
    display: block;
    background-color: rgba(255, 255, 255, 0.08);
    border-radius: 1rem;
    overflow: hidden;
    text-decoration: none;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    color: white;
    backdrop-filter: blur(10px);
  }
  .blog-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-color);
  }
  .blog-card-thumbnail {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
  }
  .blog-card-content {
    padding: 1.25rem;
  }
  .blog-card-title {
    font-size: clamp(0.8rem, 3vw, 1.1rem);
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 0.5rem;
  }
  .blog-card-date {
    font-size: clamp(0.6rem, 3vw, 0.9rem);
    color: #ccc;
    margin-bottom: 1rem;
  }
  .blog-card-more {
    font-size: clamp(0.6rem, 3vw, 0.9rem);
    font-weight: 500;
    color: #bbb;
    transition: color 0.2s ease;
  }
  .blog-card:hover .blog-card-more {
    color: var(--primary-color);
  }

/* 피드백 */
  #feedback img {
    display: block;
    margin: 2rem auto;
    border-radius: 1.5rem;
    width: clamp(160px, 40vw, 300px);
    height: auto;
  }
  .review-modal {
    position: fixed;
    top: 0; left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
  }
  .review-modal.active {
    display: flex;
  }
  .review-modal-content {
    background: var(--background-color);
    border-radius: 1rem;
    padding: 2rem;
    width: 90%;
    max-width: 960px;
    max-height: 90vh;
    overflow-y: auto;
    position: relative;
  }
  .close-modal {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    color: white;
  }
  .review-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  }
  .review-card {
    position: relative;
    background-color: #d4d4d4; /* 기본 회색 배경 */
    padding: 1.5rem;
    border-radius: 0.4rem;
    font-size: 0.95rem;
    color: #111;
    line-height: 1.5;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
    transition: background-color 0.3s ease;
  }
  .review-card span {
    display: block;
    margin-top: 0.8rem;
    font-size: 0.75rem;     /* 작게 */
    font-weight: 400;       /* 보통 */
    color: #555;            /* 연한 회색 */
    font-style: italic;     /* (선택) 기울임 */
  }
  .review-card:hover {
    background-color: #fff; /* 호버 시 흰색 배경 */
  }
  .review-card .quote-icon {
    position: relative;
    width: 20px;
    height: 20px;
    opacity: 0.6;
  }

  /* === 피드백 섹션 버튼 & 태그 === */
  .feedback-tags {
    text-align: center;
    margin: 1.5rem 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
  }
  .feedback-tags span {
    color: #ccc;
    font-size: clamp(0.6rem, 3vw, 0.9rem);
    background-color: #1e1e1e;
    padding: 0.3rem 0.8rem;
    border-radius: 999px;
  }
  .review-btn {
    background: white;
    color: black;
    padding: clamp(0.6rem, 3vw, 0.9rem) clamp(1.2rem, 3vw, 1.5rem);
    border-radius: 999px;
    font-size: clamp(0.7rem, 3vw, 1.0rem);
    font-weight: 600;
    border: none;
    cursor: pointer;
    margin: 2rem auto 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    justify-content: center;
  }
  .feedback-tooltip {
    position: absolute;
    right: 110%; /* 왼쪽에 배치 */
    background-color: #333;
    color: #fff;
    padding: 0.4rem 0.7rem;
    border-radius: 6px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    transform: translateY(-50%);
    top: 50%;
    transition: opacity 0.2s ease;
    pointer-events: none;
  }
  /* 마우스 호버 시 보이게 */
  .floating-feedback-btn:hover .feedback-tooltip {
    opacity: 1;
  }


  /* === 오른쪽 하단 고정 버튼 === */
  .floating-feedback-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: white;
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 999;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
  }
  .floating-feedback-btn img {
    width: 24px;
    height: 24px;
  }

  /* 카드 디자인 */ 
  .card-grid {
    display: grid;
    /* grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); */
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }
  .card {
    background-color: var(--card-bg);
    padding: 1.75rem;
    border-radius: 12px;
    transition: transform 0.3s ease;
  }
  .card:hover {
    transform: translateY(-5px);
  }
  .card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
    font-weight: 600;
  }
  .card p {
    color: var(--subtext-color);
    font-size: 1rem;
  }
  
  /* footer */ 
  footer {
    text-align: center;
    padding: 3rem 1rem;
    font-size: clamp(0.7rem, 3vw, 1rem);
    color: var(--subtext-color);
  }
  footer a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 0.5rem;
  }
  
  /* 전체 애니메이션 */
  .fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
  }
  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }
  
  /* 반응형 */
  @media (max-width: 768px) {
    body {
      font-size: 1rem;
    }
  
  /* header */
    header h1 {
      font-size: 1.5rem;
    }
    header img {
      width: 150px;
    }

  /* 떠다니는 목차 */ 
    .nav-dots {
      display: none;
    }

  /* 기술 스택 */
    .skills-grid {
      grid-template-columns: repeat(3, 1fr);
    }

  /* 경험 사항 */ 
    .experience-entry {
      grid-template-columns: 1fr;
      text-align: center;
    }
    .experience-year, 
    .experience-year-first {
      text-align: center;
    }
    .tech-stack {
      align-items: center;
      justify-content: center;
    }
    .tech-stack img {
      width: 28px;
      height: 28px;
    }
    .section-title {
      font-size: 1.25rem;
    }
    .card {
      padding: 1.25rem;
    }
    .card-grid {
      grid-template-columns: 1fr; /* 모바일에서는 1열 */
    }
    .blog-card-grid {
      grid-template-columns: 1fr; /* 모바일에서는 1열 */
    }
    .skill-icon {
      width: 60px;
      height: 60px;
    }

  /* 오른쪽 하단 플로팅 버튼 */
    .floating-feedback-btn {
      width: 40px;
      height: 40px;
    }
  }