@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+KR:wght@400;600;900&family=Noto+Sans+KR:wght@300;400;500;700&family=Outfit:wght@300;400;600;800&display=swap');

:root {
  --ivory: #F6F1E7;
  --wilderness: #3B5A52;
  --wilderness-deep: #1d2e27;
  --clay: #B96A4B;
  --ochre: #B8860B;
  --ink: #2B2B26;
  --ink-soft: #5C574C;
  --ink-muted: #8c877a;
  --white: #ffffff;
  --glass-bg: rgba(255, 255, 255, 0.75);
  --glass-border: rgba(255, 255, 255, 0.4);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.15);
  --font-serif: 'Noto Serif KR', serif;
  --font-sans: 'Noto Sans KR', sans-serif;
  --font-outfit: 'Outfit', sans-serif;
  --radius: 12px;
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--ivory);
  font-family: var(--font-sans);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

/* ---- Header (Sticky Glassmorphism) ---- */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 241, 231, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(43, 43, 38, 0.08);
  transition: var(--transition);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--wilderness-deep);
}

.logo span {
  color: var(--clay);
  font-family: var(--font-outfit);
  font-weight: 800;
  font-size: 1.5rem;
}

/* ---- Nav Tabs ---- */
.nav-tabs {
  display: flex;
  gap: 8px;
}

.tab-btn {
  background: transparent;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 8px 18px;
  border-radius: 20px;
  cursor: pointer;
  transition: var(--transition);
}

.tab-btn:hover {
  color: var(--wilderness);
  background: rgba(59, 90, 82, 0.05);
}

.tab-btn.active {
  background: var(--wilderness);
  color: var(--ivory);
  font-weight: 700;
}

/* ---- Hero Section ---- */
.hero {
  background: linear-gradient(135deg, var(--wilderness-deep) 0%, #17241f 100%);
  color: var(--ivory);
  padding: 100px 24px 80px 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(185, 106, 75, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-subtitle {
  font-family: var(--font-outfit);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.25em;
  color: var(--ochre);
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: 3.2rem;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.hero-desc {
  font-size: 1.15rem;
  font-weight: 300;
  color: rgba(246, 241, 231, 0.85);
  margin-bottom: 40px;
}

/* ---- Search Box ---- */
.search-container {
  max-width: 500px;
  margin: 0 auto;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 16px 24px 16px 50px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--white);
  font-size: 1rem;
  outline: none;
  transition: var(--transition);
}

.search-input::placeholder {
  color: rgba(246, 241, 231, 0.5);
}

.search-input:focus {
  background: rgba(255, 255, 255, 0.15);
  border-color: var(--ochre);
  box-shadow: 0 0 15px rgba(184, 134, 11, 0.3);
}

.search-icon {
  position: absolute;
  left: 20px;
  top: 50%;
  transform: translateY(-50%);
  color: rgba(246, 241, 231, 0.6);
  font-size: 1.2rem;
  pointer-events: none;
}

/* ---- Main Content Wrapper ---- */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 60px 24px;
}

/* ---- Section Common ---- */
.section-wrapper {
  display: none;
  animation: fadeIn 0.4s ease-out forwards;
}

.section-wrapper.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-header {
  margin-bottom: 40px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-bottom: 2px solid rgba(43, 43, 38, 0.08);
  padding-bottom: 16px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--wilderness-deep);
}

/* ---- Category Filter Buttons (For Blogs) ---- */
.filter-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--white);
  border: 1px solid rgba(43, 43, 38, 0.1);
  padding: 6px 16px;
  border-radius: 15px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink-soft);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover {
  border-color: var(--wilderness);
  color: var(--wilderness);
}

.filter-btn.active {
  background: var(--wilderness-deep);
  border-color: var(--wilderness-deep);
  color: var(--ivory);
}

/* ---- Grid Layout ---- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 30px;
}

/* ---- Premium Cards ---- */
.card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid rgba(43, 43, 38, 0.05);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(59, 90, 82, 0.15);
}

.card-image-wrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--wilderness-deep);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.card-image-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(0,0,0,0.6) 100%);
  z-index: 1;
}

.card-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  background: rgba(185, 106, 75, 0.9);
  color: var(--white);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 4px;
  z-index: 2;
}

.card-banner-title {
  position: absolute;
  bottom: 16px;
  left: 20px;
  right: 20px;
  color: var(--ivory);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  z-index: 2;
  line-height: 1.3;
}

.card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.card-meta {
  font-size: 0.75rem;
  color: var(--ink-muted);
  font-weight: 500;
  margin-bottom: 10px;
  display: flex;
  gap: 12px;
}

.card-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--ink);
  margin-bottom: 12px;
  line-height: 1.4;
}

.card-excerpt {
  font-size: 0.9rem;
  color: var(--ink-soft);
  margin-bottom: 24px;
  flex-grow: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-actions {
  display: flex;
  gap: 10px;
  margin-top: auto;
}

.btn-primary, .btn-secondary {
  flex: 1;
  padding: 10px 16px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 700;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}

.btn-primary {
  background: var(--wilderness);
  border: 1px solid var(--wilderness);
  color: var(--ivory);
}

.btn-primary:hover {
  background: var(--wilderness-deep);
  border-color: var(--wilderness-deep);
}

.btn-secondary {
  background: transparent;
  border: 1px solid rgba(43, 43, 38, 0.15);
  color: var(--ink-soft);
}

.btn-secondary:hover {
  border-color: var(--wilderness);
  color: var(--wilderness);
  background: rgba(59, 90, 82, 0.02);
}

/* ---- Word Cards specifically for GTR ---- */
.gtr-card .card-image-wrap {
  background: linear-gradient(135deg, #1f4037 0%, #99f2c8 100%);
}

.gtr-progress-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(43, 43, 38, 0.8);
  color: var(--ivory);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 20px;
  z-index: 2;
}

/* ---- Modal & Carousel CSS ---- */
.modal {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(29, 46, 39, 0.85);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.35s ease;
}

.modal.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  width: 90%;
  max-width: 580px;
  aspect-ratio: 1 / 1;
  background: #fbfbfb;
  border-radius: 16px;
  box-shadow: 0 25px 60px rgba(0,0,0,0.4);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.9);
  transition: transform 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.modal.active .modal-content {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(0,0,0,0.3);
  border: none;
  color: var(--white);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1010;
  transition: var(--transition);
}

.modal-close:hover {
  background: rgba(0,0,0,0.5);
}

/* Carousel Inner Track */
.carousel-track-container {
  width: 100%;
  height: 100%;
  position: relative;
  overflow: hidden;
  flex-grow: 1;
}

.carousel-track {
  display: flex;
  width: 400%; /* 4 slides */
  height: 100%;
  transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
}

.carousel-slide {
  width: 25%;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 50px 48px;
  position: relative;
  background: var(--ivory);
}

/* Slider indicators & arrows */
.carousel-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.8);
  border-radius: 50%;
  border: 1px solid rgba(0,0,0,0.05);
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1005;
  transition: var(--transition);
  color: var(--ink);
}

.carousel-nav-btn:hover {
  background: var(--white);
  box-shadow: 0 5px 15px rgba(0,0,0,0.15);
}

.carousel-nav-btn.prev { left: 16px; }
.carousel-nav-btn.next { right: 16px; }

.carousel-dots {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 1005;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(43, 43, 38, 0.2);
  cursor: pointer;
  transition: var(--transition);
}

.carousel-dot.active {
  background: var(--wilderness);
  transform: scale(1.2);
  width: 20px;
  border-radius: 4px;
}

/* ---- Slides Specific Styles (Card News Layout) ---- */
.slide-cover {
  background: var(--wilderness-deep);
  color: var(--ivory);
  text-align: center;
}

.slide-cover .eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.25em;
  color: var(--ochre);
  font-weight: 600;
  margin-bottom: 16px;
  text-transform: uppercase;
}

.slide-cover h2 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  line-height: 1.35;
  margin-bottom: 12px;
}

.slide-cover .ref {
  font-size: 0.95rem;
  color: var(--ink-muted);
}

.slide-card {
  color: var(--ink);
}

.slide-card .slide-tag {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--clay);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.slide-card h3 {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  margin-bottom: 16px;
  color: var(--wilderness-deep);
  line-height: 1.35;
}

.slide-card p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--ink-soft);
}

.slide-card .word-study-container {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.slide-card .word-pair {
  border-bottom: 1px solid rgba(43, 43, 38, 0.08);
  padding-bottom: 10px;
}

.slide-card .word-pair:last-child {
  border-bottom: none;
}

.slide-card .word-heb {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ochre);
  margin-bottom: 4px;
}

/* ---- Footer ---- */
footer {
  background: var(--wilderness-deep);
  color: var(--ivory);
  padding: 48px 24px;
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-logo {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 900;
  margin-bottom: 16px;
}

.footer-desc {
  font-size: 0.9rem;
  color: rgba(246, 241, 231, 0.6);
  margin-bottom: 24px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.footer-copyright {
  font-size: 0.8rem;
  color: rgba(246, 241, 231, 0.4);
}

/* ---- Hamburger Button (Mobile Only) ---- */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 8px;
  transition: var(--transition);
  z-index: 200;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--wilderness-deep);
  border-radius: 2px;
  transition: all 0.3s ease;
  transform-origin: center;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---- Responsive: Tablet ---- */
@media (max-width: 900px) {
  .header-container {
    padding: 14px 20px;
    flex-wrap: wrap;
  }

  .hero {
    padding: 72px 20px 60px;
  }

  .hero h1 {
    font-size: 2.4rem;
  }

  .grid {
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
  }

  main {
    padding: 48px 20px;
  }
}

/* ---- Responsive: Mobile ---- */
@media (max-width: 640px) {
  /* Header */
  .header-container {
    padding: 12px 16px;
    position: relative;
    flex-wrap: nowrap;
    align-items: center;
  }

  .logo {
    font-size: 1.1rem;
  }

  .logo span {
    font-size: 1.2rem;
  }

  /* Show hamburger, hide nav by default */
  .hamburger {
    display: flex;
    margin-left: auto;
  }

  .nav-tabs {
    display: none;
    flex-direction: column;
    gap: 6px;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(246, 241, 231, 0.97);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(43, 43, 38, 0.1);
    padding: 12px 16px 16px;
    z-index: 150;
    box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  }

  .nav-tabs.mobile-open {
    display: flex;
  }

  .tab-btn {
    width: 100%;
    text-align: left;
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: 8px;
  }

  /* Hero */
  .hero {
    padding: 56px 16px 48px;
  }

  .hero-subtitle {
    font-size: 0.78rem;
    letter-spacing: 0.18em;
  }

  .hero h1 {
    font-size: 1.75rem;
    margin-bottom: 16px;
  }

  .hero-desc {
    font-size: 0.95rem;
    margin-bottom: 28px;
  }

  .search-input {
    font-size: 0.9rem;
    padding: 13px 16px 13px 44px;
  }

  /* Main */
  main {
    padding: 32px 16px 48px;
  }

  /* Section Header */
  .section-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 24px;
  }

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

  /* Filter bar */
  .filter-bar {
    gap: 6px;
    flex-wrap: wrap;
  }

  .filter-btn {
    font-size: 0.8rem;
    padding: 5px 12px;
  }

  /* Grid: single column on mobile */
  .grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  /* Cards */
  .card-image-wrap {
    aspect-ratio: 16 / 8;
  }

  .card-body {
    padding: 18px;
  }

  .card-title {
    font-size: 1.15rem;
  }

  /* Card action buttons: stack on very small screens */
  .card-actions {
    flex-direction: column;
    gap: 8px;
  }

  .btn-primary, .btn-secondary {
    font-size: 0.9rem;
    padding: 12px 16px;
  }

  /* Modal / Carousel */
  .modal-content {
    width: 95%;
    aspect-ratio: auto;
    height: 80vh;
  }

  .carousel-slide {
    padding: 32px 20px;
  }

  .slide-cover h2 {
    font-size: 1.4rem;
  }

  .slide-card h3 {
    font-size: 1.15rem;
  }

  .slide-card p {
    font-size: 0.88rem;
  }

  .carousel-nav-btn {
    width: 32px;
    height: 32px;
    font-size: 0.8rem;
  }

  .carousel-nav-btn.prev { left: 8px; }
  .carousel-nav-btn.next { right: 8px; }

  /* Footer */
  footer {
    padding: 36px 16px;
  }

  .footer-logo {
    font-size: 1.1rem;
  }

  .footer-desc {
    font-size: 0.82rem;
  }
}