/* ══════════════════════════════════════════
   연산 학습가이드 (front-guide.css)
   ver3 guide_ver_B.html 이식
   ══════════════════════════════════════════ */

:root {
  --mint:        #1DBFB0;
  --mint-dark:   #129E91;
  --mint-mid:    #D4F2EE;
  --mint-light:  #F0FAF9;
  --navy:        #1C1F33;
  --gray-bg:     #F7F8FA;
  --gray-border: #EEF0F3;
  --gray-line:   #D0D5DD;
  --gray-text:   #6B7280;
  --white:       #FFFFFF;
}

/* ── HERO ── */
.guide-hero {
  background: var(--mint-light);
  padding: 44px 24px 36px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.guide-hero::before {
  content: ''; position: absolute; inset: 0;
  background-image: radial-gradient(circle, var(--mint-mid) 1.5px, transparent 1.5px);
  background-size: 28px 28px; opacity: 0.55; pointer-events: none;
}
.guide-hero > * { position: relative; z-index: 1; }
/* ver4: 답지 센터·선택가이드와 동일한 히어로 구조(연산 기호 장식 + 컬러 강조 제목)로 통일 */
.guide-hero-decos { position: absolute; inset: 0; pointer-events: none; }
.guide-hero-decos .deco {
  position: absolute; font-weight: 900; opacity: 0.13;
  color: var(--mint-dark); user-select: none; line-height: 1;
}
.guide-hero h1 {
  font-size: 32px; font-weight: 900;
  letter-spacing: -0.8px; margin-bottom: 10px;
}
.guide-hero h1 .em { color: var(--mint); }
.guide-hero p {
  font-size: 14px; color: var(--gray-text);
  line-height: 1.75; word-break: keep-all;
}
.guide-hero-fade { height: 16px; background: linear-gradient(to bottom, var(--mint-light) 0%, var(--gray-bg) 100%); }
@media (max-width: 640px) {
  .guide-hero { padding: 32px 20px 28px; }
  .guide-hero h1 { font-size: 26px; }
}

/* ── 추가 질문 CTA (ver4 신규) ── */
.help-cta {
  max-width: 900px;
  margin: 8px auto 0;
  padding: 0 24px 48px;
}
.help-cta-box {
  background: var(--mint-light);
  border: 1.5px solid var(--mint-mid);
  border-radius: 16px;
  padding: 28px 24px;
  text-align: center;
}
.help-cta-icon { font-size: 30px; margin-bottom: 10px; }
.help-cta-title {
  font-size: 17px; font-weight: 900; color: var(--navy);
  margin-bottom: 6px; word-break: keep-all;
}
.help-cta-sub {
  font-size: 13px; color: var(--gray-text);
  line-height: 1.6; margin-bottom: 18px; word-break: keep-all;
}
.help-cta-btn {
  display: inline-flex; align-items: center; gap: 6px;
  height: 46px; padding: 0 22px;
  background: var(--mint); color: white;
  font-size: 14px; font-weight: 700;
  border-radius: 10px; transition: background 0.18s;
}
.help-cta-btn:hover { background: var(--mint-dark); }
@media (max-width: 640px) {
  .help-cta { padding: 0 16px 40px; }
  .help-cta-box { padding: 24px 18px; }
}

/* ── TAB BAR ── */
.guide-tabs {
  position: sticky;
  top: 56px;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--gray-border);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.guide-tabs::-webkit-scrollbar { display: none; }
.guide-tabs-inner {
  display: flex;
  justify-content: center;
  gap: 6px;
  padding: 10px 16px;
  white-space: nowrap;
}
.tab-btn {
  background: none;
  border: 1.5px solid var(--gray-border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 13px; font-weight: 600;
  color: var(--gray-text);
  cursor: pointer;
  transition: all 0.18s;
  font-family: inherit;
  white-space: nowrap;
  flex-shrink: 0;
}
.tab-btn:hover { border-color: var(--gray-line); color: var(--navy); }
.tab-btn.active {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--white);
}

/* ── CARD GRID ── */
.guide-content {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px 64px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  align-items: start;
}
@media (max-width: 640px) {
  .guide-content { grid-template-columns: 1fr; padding: 16px 12px 48px; }
}

/* ── CARD ── */
.guide-card {
  background: var(--white);
  border-radius: 14px;
  border: 1.5px solid var(--gray-border);
  overflow: hidden;
  transition: border-color 0.18s, box-shadow 0.18s;
}
.guide-card:hover { box-shadow: 0 2px 12px rgba(0,0,0,0.06); }
.guide-card.open {
  border-color: var(--mint-mid);
  box-shadow: 0 4px 20px rgba(29,191,176,0.1);
}
.guide-card.hidden { display: none; }

.card-header { padding: 18px 18px 0; }

.card-badge {
  display: inline-block;
  font-size: 11px; font-weight: 700;
  padding: 3px 9px; border-radius: 8px;
  margin-bottom: 10px;
}
.cat-진도시기   { background: #EEF0FB; color: #4A5BC7; }
.cat-태도       { background: #FEF3E2; color: #B06A00; }
.cat-효과어려움 { background: #E8F8F0; color: #1A7A47; }

.card-question {
  font-size: 15px; font-weight: 800;
  color: var(--navy); line-height: 1.5;
  margin-bottom: 7px; word-break: keep-all;
}
.card-summary {
  font-size: 12px; color: var(--gray-text);
  line-height: 1.6; word-break: keep-all;
  padding-bottom: 16px;
}

.card-toggle {
  width: 100%;
  padding: 10px 18px;
  background: none;
  border: none;
  border-top: 1px solid var(--gray-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px; font-weight: 700;
  color: var(--mint-dark);
  cursor: pointer;
  font-family: inherit;
  transition: background 0.15s;
}
.card-toggle:hover { background: var(--mint-light); }
.card-toggle .show-open { display: inline; }
.card-toggle .show-close { display: none; }
.guide-card.open .card-toggle .show-open { display: none; }
.guide-card.open .card-toggle .show-close { display: inline; }
.card-chevron { font-size: 12px; font-weight: 700; }

/* ── CARD DETAIL ── */
.card-detail { height: 0; overflow: hidden; transition: height 0.32s ease; }
.card-detail-inner {
  border-top: 1px solid var(--gray-border);
  padding: 16px 18px 18px;
}
.card-ans {
  font-size: 13px; color: var(--navy);
  line-height: 1.85; word-break: keep-all;
  margin-bottom: 14px;
}
.card-tips {
  background: var(--mint-light);
  border-radius: 10px;
  padding: 13px 15px;
  border-left: 3px solid var(--mint);
}
.card-tips-title {
  font-size: 11px; font-weight: 800;
  color: var(--mint-dark); margin-bottom: 9px;
}
.card-tips ul { list-style: none; display: flex; flex-direction: column; gap: 6px; }
.card-tips li {
  font-size: 12px; color: var(--navy);
  line-height: 1.65; word-break: keep-all;
  display: flex; gap: 7px; align-items: flex-start;
}
.card-tips li::before {
  content: '✓'; color: var(--mint-dark);
  font-size: 11px; font-weight: 900; flex-shrink: 0; margin-top: 2px;
}