/* ===================================================================
   후추봇의 칠판 — 클래식 블랙(진녹) 칠판 + 흰 분필
   교실 벽에 걸린 칠판 컨셉: 원목 프레임 · 진녹 보드 · 분필 카드 · 자석
   =================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Gaegu:wght@400;700&family=Nanum+Pen+Script&display=swap');

:root {
  --chalk-board:   #2c4034;   /* 진녹 칠판 */
  --chalk-board-2: #1e2c24;   /* 진한 가장자리 */
  --chalk-white:   #f4f1e6;   /* 분필 흰색 */
  --chalk-dim:     #cfcbb8;   /* 흐린 분필 */
  --chalk-yellow:  #f3e27a;   /* 노란 분필 */
  --chalk-pink:    #f0a7b8;   /* 분홍 분필 */
  --chalk-blue:    #a9d4e6;   /* 파란 분필 */
  --chalk-green:   #bcd99a;   /* 연두 분필 */
  --wood:    #835a33;         /* 원목 프레임 */
  --wood-d:  #5e3d22;
  --wood-l:  #a3743f;
  --chalk-font: 'Gaegu', 'Pretendard', sans-serif;
  --pen-font: 'Nanum Pen Script', 'Gaegu', sans-serif;
}

/* 교실 벽 (칠판 뒤 배경) */
body {
  background:
    radial-gradient(circle at 20% 0%, #4a3826 0%, transparent 45%),
    radial-gradient(circle at 90% 100%, #3a2c1d 0%, transparent 50%),
    #2f2417;
  min-height: 100vh;
}

/* 헤더를 우드톤으로 오버라이드 (칠판 몰입감) */
.header {
  background: linear-gradient(120deg, var(--wood-l), var(--wood-d)) !important;
  border-bottom: 3px solid #00000033 !important;
}
.header .header-title,
.header .header-greeting { color: #fdf6e9 !important; }
.header .back-btn {
  background: #ffffff22 !important;
  color: #fdf6e9 !important;
  border: 1px solid #ffffff33 !important;
}
.header .dark-toggle { filter: brightness(1.3); }

/* ===== 칠판 본체 ===== */
.bb-wrap {
  max-width: 920px;
  margin: 18px auto 40px;
  padding: 0 14px;
}

.chalkboard {
  position: relative;
  border-radius: 14px;
  /* 원목 프레임 */
  padding: 16px;
  background:
    repeating-linear-gradient(
      90deg,
      var(--wood) 0px, var(--wood) 6px,
      var(--wood-d) 6px, var(--wood-d) 8px,
      var(--wood-l) 8px, var(--wood-l) 12px
    );
  box-shadow:
    0 10px 30px rgba(0,0,0,0.45),
    inset 0 2px 4px rgba(255,255,255,0.15),
    inset 0 -3px 6px rgba(0,0,0,0.35);
}

/* 진녹 보드 면 */
.chalkboard-inner {
  position: relative;
  border-radius: 6px;
  padding: 30px 26px 40px;
  background:
    radial-gradient(circle at 30% 20%, #36503f 0%, transparent 40%),
    radial-gradient(circle at 75% 75%, #2a3e32 0%, transparent 45%),
    linear-gradient(135deg, var(--chalk-board), var(--chalk-board-2));
  box-shadow: inset 0 0 60px rgba(0,0,0,0.5), inset 0 0 0 1px rgba(0,0,0,0.4);
  overflow: hidden;
}
/* 칠판지우개로 닦은 자국 */
.chalkboard-inner::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background:
    radial-gradient(ellipse 240px 60px at 25% 35%, rgba(255,255,255,0.06), transparent 70%),
    radial-gradient(ellipse 200px 50px at 70% 65%, rgba(255,255,255,0.05), transparent 70%),
    radial-gradient(ellipse 180px 40px at 50% 85%, rgba(255,255,255,0.04), transparent 70%);
}

/* 칠판 머리말 (분필 손글씨) */
.bb-board-title {
  position: relative;
  font-family: var(--chalk-font);
  font-weight: 700;
  font-size: 2.1rem;
  color: var(--chalk-white);
  text-align: center;
  margin: 0 0 4px;
  text-shadow: 0 0 1px rgba(255,255,255,0.5), 1px 1px 0 rgba(0,0,0,0.2);
  letter-spacing: 1px;
}
.bb-board-sub {
  position: relative;
  font-family: var(--pen-font);
  font-size: 1.35rem;
  color: var(--chalk-green);
  text-align: center;
  margin: 0 0 8px;
  text-shadow: 0 0 1px rgba(255,255,255,0.3);
}
/* 분필 밑줄 */
.bb-underline {
  position: relative;
  width: 200px; height: 4px;
  margin: 0 auto 26px;
  background: var(--chalk-white);
  opacity: 0.85;
  border-radius: 3px;
  filter: blur(0.4px);
  -webkit-mask-image: repeating-linear-gradient(90deg, #000 0 14px, transparent 14px 18px);
          mask-image: repeating-linear-gradient(90deg, #000 0 14px, transparent 14px 18px);
}

/* ===== 핀 카드 그리드 ===== */
.bb-pins {
  position: relative;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 26px 22px;
  padding: 8px 4px 4px;
}

.bb-pin {
  position: relative;
  display: block;
  text-decoration: none;
  padding: 20px 18px 16px;
  border-radius: 4px;
  background: rgba(255,255,255,0.035);
  border: 2px solid rgba(244,241,230,0.55);
  /* 분필로 그린 듯 살짝 거친 테두리 */
  box-shadow: inset 0 0 0 1px rgba(244,241,230,0.12);
  color: var(--chalk-white);
  transition: transform 0.18s cubic-bezier(0.34,1.56,0.64,1),
              box-shadow 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}
/* 카드마다 살짝 다른 기울기 (압정으로 대충 붙인 느낌) */
.bb-pin:nth-child(3n+1) { transform: rotate(-1.4deg); }
.bb-pin:nth-child(3n+2) { transform: rotate(0.8deg); }
.bb-pin:nth-child(3n+3) { transform: rotate(-0.5deg); }

.bb-pin:hover {
  transform: rotate(0deg) translateY(-5px) scale(1.02);
  background: rgba(255,255,255,0.08);
  border-color: var(--chalk-white);
  box-shadow: 0 8px 22px rgba(0,0,0,0.4), inset 0 0 0 1px rgba(244,241,230,0.2);
  z-index: 2;
}

/* 자석 (카드 상단 가운데) */
.bb-pin::before {
  content: "";
  position: absolute;
  top: -10px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 20px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #ff8b6b, #c0392b 70%, #8a1f12);
  box-shadow: 0 2px 4px rgba(0,0,0,0.5), inset 0 1px 2px rgba(255,255,255,0.5);
}
/* 자석 색을 카드별 변주 */
.bb-pin[data-mag="yellow"]::before { background: radial-gradient(circle at 35% 30%, #ffe27a, #e6b800 70%, #9c7c00); }
.bb-pin[data-mag="blue"]::before   { background: radial-gradient(circle at 35% 30%, #9bd3ff, #2f7fd1 70%, #184b80); }
.bb-pin[data-mag="green"]::before  { background: radial-gradient(circle at 35% 30%, #b6e89a, #5aa83f 70%, #356326); }
.bb-pin[data-mag="purple"]::before { background: radial-gradient(circle at 35% 30%, #d7a7e8, #9b6bb0 70%, #6a4080); }

.bb-pin-icon {
  font-size: 2.1rem;
  line-height: 1;
  margin: 4px 0 8px;
  display: block;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.4));
}
.bb-pin-title {
  font-family: var(--chalk-font);
  font-weight: 700;
  font-size: 1.28rem;
  color: var(--chalk-white);
  margin: 0 0 6px;
  text-shadow: 0 0 1px rgba(255,255,255,0.4);
  line-height: 1.25;
}
.bb-pin-desc {
  font-family: var(--pen-font);
  font-size: 1.12rem;
  color: var(--chalk-dim);
  line-height: 1.3;
  margin: 0 0 10px;
}
.bb-pin-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--chalk-font);
  font-size: 0.86rem;
  color: var(--chalk-green);
}
.bb-pin-tag {
  font-family: var(--chalk-font);
  font-size: 0.78rem;
  color: var(--chalk-board-2);
  background: var(--chalk-green);
  padding: 1px 8px;
  border-radius: 100px;
  opacity: 0.9;
}

/* 빈 칠판 안내 (핀이 없을 때) */
.bb-empty {
  grid-column: 1 / -1;
  text-align: center;
  font-family: var(--pen-font);
  font-size: 1.4rem;
  color: var(--chalk-dim);
  padding: 40px 0;
}

/* 칠판 하단 분필 받침대 (트레이) */
.bb-tray {
  height: 16px;
  margin: -4px 18px 0;
  border-radius: 0 0 8px 8px;
  background: linear-gradient(180deg, var(--wood-l), var(--wood-d));
  box-shadow: 0 6px 12px rgba(0,0,0,0.4), inset 0 2px 2px rgba(255,255,255,0.2);
  position: relative;
}
/* 트레이 위 분필 두 개 */
.bb-tray::before {
  content: "";
  position: absolute;
  top: -5px; left: 24px;
  width: 46px; height: 7px;
  border-radius: 4px;
  background: linear-gradient(180deg, #fff, #e6e2d2);
  box-shadow: 0 1px 2px rgba(0,0,0,0.3);
  transform: rotate(-1deg);
}
.bb-tray::after {
  content: "";
  position: absolute;
  top: -5px; left: 78px;
  width: 38px; height: 7px;
  border-radius: 4px;
  background: linear-gradient(180deg, #fef0b8, #e6cf6a);
  box-shadow: 0 1px 2px rgba(0,0,0,0.3);
  transform: rotate(1.2deg);
}

/* 안내 문구 (칠판 아래) */
.bb-note {
  text-align: center;
  font-family: var(--pen-font);
  font-size: 1.2rem;
  color: #e8dcc6;
  margin: 22px auto 0;
  max-width: 600px;
  line-height: 1.5;
}
.bb-note b { color: var(--chalk-yellow); font-weight: 400; }

/* 푸터를 어두운 벽톤에 맞춤 */
.footer { color: #d8c8ac !important; }

/* 반응형 */
@media (max-width: 520px) {
  .chalkboard-inner { padding: 24px 16px 32px; }
  .bb-board-title { font-size: 1.7rem; }
  .bb-pins { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 22px 16px; }
  .bb-pin-icon { font-size: 1.8rem; }
  .bb-pin-title { font-size: 1.12rem; }
}