/* ===== Google Fonts ===== */
@import url('https://fonts.googleapis.com/css2?family=Gowun+Batang&family=Gamja+Flower&family=Poor+Story&display=swap');

/* ===== CSS Variables ===== */
:root {
  --bg-main: #f4f9f0;
  --bg-card: #ffffff;
  --bg-accent: #d4edda;
  --bg-accent-hover: #c1e6c9;
  --green-dark: #4a7c59;
  --green-mid: #6fae81;
  --green-light: #a8d5ba;
  --green-pastel: #e8f5e9;
  --text-main: #3a3a3a;
  --text-sub: #6b6b6b;
  --text-accent: #2d5a3d;
  --border-soft: #d0e8d6;
  --shadow-card: 0 4px 16px rgba(74, 124, 89, 0.10);
  --shadow-hover: 0 8px 28px rgba(74, 124, 89, 0.18);
  --radius: 16px;
  --radius-sm: 10px;
  --transition: 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Gowun Batang', serif;
  background: var(--bg-main);
  color: var(--text-main);
  line-height: 1.8;
  min-height: 100vh;
}

a {
  color: var(--green-dark);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--green-mid);
}

/* ===== Pixel-art decorative border ===== */
.pixel-border {
  border: 3px solid var(--green-light);
  border-image: repeating-linear-gradient(
    90deg,
    var(--green-light) 0px,
    var(--green-light) 6px,
    transparent 6px,
    transparent 10px
  ) 3;
}

/* ===== Navigation ===== */
.navbar {
  background: var(--bg-card);
  border-bottom: 3px solid var(--green-light);
  padding: 0.8rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(74, 124, 89, 0.08);
}

.nav-logo {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.6rem;
  color: var(--green-dark);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-logo .pixel-star {
  display: inline-block;
  width: 22px;
  height: 22px;
  background: var(--green-mid);
  clip-path: polygon(
    50% 0%, 61% 35%, 98% 35%, 68% 57%,
    79% 91%, 50% 70%, 21% 91%, 32% 57%,
    2% 35%, 39% 35%
  );
}

.nav-links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  font-family: 'Poor Story', cursive;
  font-size: 1.1rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  transition: background var(--transition), color var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--bg-accent);
  color: var(--text-accent);
}

/* ===== Hero Section ===== */
.hero {
  text-align: center;
  padding: 3rem 2rem 2rem;
  position: relative;
}

.hero::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  margin: 1.5rem auto 0;
  background: repeating-linear-gradient(
    90deg,
    var(--green-mid) 0px,
    var(--green-mid) 8px,
    transparent 8px,
    transparent 14px
  );
}

.hero-title {
  font-family: 'Gamja Flower', cursive;
  font-size: 2.6rem;
  color: var(--green-dark);
  margin-bottom: 0.4rem;
}

.hero-sub {
  font-family: 'Poor Story', cursive;
  font-size: 1.2rem;
  color: var(--text-sub);
}

.hero-badge {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.3rem 1rem;
  background: var(--bg-accent);
  color: var(--text-accent);
  border-radius: 20px;
  font-family: 'Poor Story', cursive;
  font-size: 0.95rem;
}

/* ===== Container ===== */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.container-wide {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* ===== Section Title ===== */
.section-title {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.8rem;
  color: var(--green-dark);
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-title .icon {
  font-size: 1.4rem;
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.card {
  background: var(--bg-card);
  border: 2px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--green-light), var(--green-mid), var(--green-light));
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

.card-title {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.3rem;
  color: var(--green-dark);
  margin-bottom: 0.5rem;
}

.card-body {
  font-size: 0.95rem;
  color: var(--text-sub);
  line-height: 1.7;
}

.card-tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  background: var(--green-pastel);
  color: var(--text-accent);
  border-radius: 12px;
  font-size: 0.8rem;
  margin: 0.2rem 0.2rem 0.2rem 0;
  font-family: 'Poor Story', cursive;
}

/* ===== Interest Cards (index) ===== */
.interest-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.interest-card {
  background: var(--bg-card);
  border: 2px dashed var(--green-light);
  border-radius: var(--radius);
  padding: 1.2rem;
  text-align: center;
  transition: transform var(--transition), border-color var(--transition);
}

.interest-card:hover {
  transform: translateY(-3px);
  border-color: var(--green-mid);
}

.interest-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.interest-label {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.15rem;
  color: var(--green-dark);
}

.interest-desc {
  font-size: 0.85rem;
  color: var(--text-sub);
  margin-top: 0.3rem;
}

/* ===== Bio Text Block ===== */
.bio-block {
  background: var(--bg-card);
  border: 2px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow-card);
  position: relative;
}

.bio-block::before {
  content: '"';
  position: absolute;
  top: 0.2rem;
  left: 1rem;
  font-size: 3rem;
  color: var(--green-light);
  font-family: 'Gamja Flower', cursive;
  line-height: 1;
}

.bio-block p {
  margin-bottom: 1rem;
  text-indent: 1em;
}

.bio-block p:last-child {
  margin-bottom: 0;
}

.bio-highlight {
  color: var(--green-dark);
  font-weight: bold;
}

/* ===== CTA Buttons ===== */
.cta-area {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius);
  font-family: 'Gamja Flower', cursive;
  font-size: 1.15rem;
  border: 2px solid var(--green-mid);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--green-mid);
  color: #fff;
}

.btn-primary:hover {
  background: var(--green-dark);
  border-color: var(--green-dark);
  color: #fff;
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--green-dark);
}

.btn-secondary:hover {
  background: var(--bg-accent);
}

/* ===== Timeline (career) ===== */
.timeline {
  position: relative;
  padding-left: 2rem;
  margin-bottom: 2rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: repeating-linear-gradient(
    180deg,
    var(--green-light) 0px,
    var(--green-light) 8px,
    transparent 8px,
    transparent 14px
  );
}

.timeline-item {
  position: relative;
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -1.65rem;
  top: 0.6rem;
  width: 14px;
  height: 14px;
  background: var(--green-mid);
  border: 3px solid var(--bg-main);
  border-radius: 50%;
}

.timeline-date {
  font-family: 'Poor Story', cursive;
  font-size: 0.9rem;
  color: var(--green-mid);
  margin-bottom: 0.2rem;
}

.timeline-content {
  background: var(--bg-card);
  border: 2px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow-card);
}

.timeline-title {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.15rem;
  color: var(--green-dark);
  margin-bottom: 0.3rem;
}

/* ===== Tables (career) ===== */
.styled-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  border: 2px solid var(--border-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 2rem;
  background: var(--bg-card);
}

.styled-table thead {
  background: var(--bg-accent);
}

.styled-table th {
  padding: 0.8rem 1rem;
  font-family: 'Gamja Flower', cursive;
  font-size: 1.05rem;
  color: var(--text-accent);
  text-align: left;
}

.styled-table td {
  padding: 0.7rem 1rem;
  border-top: 1px solid var(--border-soft);
  font-size: 0.93rem;
}

.styled-table tbody tr:hover {
  background: var(--green-pastel);
}

/* ===== Study Page ===== */
.study-card {
  background: var(--bg-card);
  border: 2px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.2rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition);
}

.study-card:hover {
  transform: translateY(-2px);
}

.study-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.6rem;
}

.study-card-title {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.2rem;
  color: var(--green-dark);
}

.study-card-date {
  font-family: 'Poor Story', cursive;
  font-size: 0.9rem;
  color: var(--green-mid);
  white-space: nowrap;
  margin-left: 1rem;
}

.study-card-body {
  font-size: 0.93rem;
  color: var(--text-sub);
}

.study-empty {
  text-align: center;
  padding: 3rem;
  color: var(--text-sub);
  font-family: 'Poor Story', cursive;
  font-size: 1.2rem;
  border: 2px dashed var(--green-light);
  border-radius: var(--radius);
}

/* ===== Paper Review (rich card) ===== */
.study-card-body h3 {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.1rem;
  color: var(--green-dark);
  margin: 1.4rem 0 0.5rem;
  padding-bottom: 0.3rem;
  border-bottom: 2px dotted var(--border-soft);
}

.study-card-body h3:first-child {
  margin-top: 0.3rem;
}

.study-card-body p {
  line-height: 1.7;
  margin-bottom: 0.6rem;
}

.study-card-body ul {
  margin: 0.4rem 0 0.8rem 1.1rem;
  padding: 0;
}

.study-card-body li {
  line-height: 1.7;
  margin-bottom: 0.35rem;
}

.study-card-body .ref-note {
  font-size: 0.82rem;
  color: var(--green-mid);
  background: var(--green-pastel);
  border-radius: 10px;
  padding: 0.5rem 0.8rem;
  margin: 0.5rem 0 0.8rem;
  word-break: break-word;
}

/* paper figures */
.paper-figure {
  margin: 1rem 0 1.2rem;
  text-align: center;
}

.paper-figure img {
  max-width: 100%;
  height: auto;
  border: 2px solid var(--border-soft);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-card);
}

.paper-figure figcaption {
  font-family: 'Poor Story', cursive;
  font-size: 0.85rem;
  color: var(--green-mid);
  margin-top: 0.5rem;
}

/* ===== Skill Tags List ===== */
.skill-group {
  margin-bottom: 1.5rem;
}

.skill-group-title {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.1rem;
  color: var(--text-accent);
  margin-bottom: 0.5rem;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.skill-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--green-pastel);
  color: var(--text-accent);
  border: 1px solid var(--green-light);
  border-radius: 20px;
  font-size: 0.88rem;
  font-family: 'Poor Story', cursive;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 2rem 1rem;
  margin-top: 2rem;
  border-top: 3px solid var(--green-light);
  background: var(--bg-card);
  font-family: 'Poor Story', cursive;
  color: var(--text-sub);
  font-size: 0.95rem;
}

.footer a {
  color: var(--green-mid);
}

/* ===== Floating Pixel Deco ===== */
.pixel-deco {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 40px;
  height: 40px;
  background: var(--green-mid);
  border-radius: 8px;
  opacity: 0.3;
  animation: float 3s ease-in-out infinite;
  pointer-events: none;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(5deg); }
}

/* ===== Links list (project, etc) ===== */
.link-icon {
  margin-right: 0.3rem;
  color: var(--green-mid);
}

/* ===== Responsive ===== */
/* ===== Music Page ===== */
.music-month {
  margin-bottom: 2.5rem;
}

.music-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  background: var(--bg-card);
  border: 2px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.2rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition);
  position: relative;
  overflow: hidden;
}

.music-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, #ffd1dc, var(--green-light), #c5b3e6, var(--green-mid));
}

.music-card:hover {
  transform: translateY(-3px);
}

.music-video {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 */
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #000;
}

.music-video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
  border-radius: var(--radius-sm);
}

.music-info {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.music-title {
  font-family: 'Gamja Flower', cursive;
  font-size: 1.3rem;
  color: var(--green-dark);
  margin-bottom: 0.2rem;
}

.music-artist {
  font-family: 'Poor Story', cursive;
  font-size: 1rem;
  color: var(--text-sub);
  margin-bottom: 0.5rem;
}

.music-tags {
  margin-bottom: 0.8rem;
}

.music-reason {
  font-size: 0.93rem;
  color: var(--text-main);
  line-height: 1.7;
  padding: 0.8rem;
  background: var(--green-pastel);
  border-radius: var(--radius-sm);
  border-left: 4px solid var(--green-mid);
}

.music-reason p {
  margin: 0;
}

@media (max-width: 700px) {
  .navbar {
    flex-direction: column;
    gap: 0.6rem;
    padding: 0.6rem 1rem;
  }

  .nav-links {
    gap: 0.8rem;
  }

  .hero-title {
    font-size: 2rem;
  }

  .container, .container-wide {
    padding: 1.2rem 1rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .interest-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cta-area {
    flex-direction: column;
    align-items: center;
  }

  .study-card-header {
    flex-direction: column;
  }

  .study-card-date {
    margin-left: 0;
    margin-top: 0.3rem;
  }

  .music-card {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 400px) {
  .interest-grid {
    grid-template-columns: 1fr;
  }
}