/* ===================================================
   LUCA 입시연구소 — 공통 스타일
   =================================================== */

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

/* ── 기본 리셋 ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-deep:      #0A0A1A;
  --bg-card:      rgba(255,255,255,0.05);
  --bg-card-hover:rgba(255,255,255,0.09);
  --border:       rgba(255,255,255,0.1);
  --border-bright:rgba(108,99,255,0.4);
  --purple:       #6C63FF;
  --cyan:         #00D4FF;
  --text-primary: #FFFFFF;
  --text-secondary:#B0B8C8;
  --text-muted:   #6B7A99;
  --success:      #00E5A0;
  --warning:      #FFB547;
  --danger:       #FF5C6C;
  --sidebar-w:    240px;
  --header-h:     64px;
  --radius:       16px;
  --radius-sm:    10px;
  --shadow:       0 8px 32px rgba(0,0,0,0.4);
  --shadow-lg:    0 16px 48px rgba(0,0,0,0.6);
  --glow:         0 0 30px rgba(108,99,255,0.3);
}

html, body {
  height: 100%;
  font-family: 'Noto Sans KR', sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── 그라디언트 유틸 ── */
.grad-text {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.grad-bg {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
}

.grad-border {
  border: 1px solid transparent;
  background-clip: padding-box;
  position: relative;
}

/* ── 스크롤바 ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(108,99,255,0.4); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(108,99,255,0.7); }

/* ══════════════════════════════════════════════════
   LUCA 로고 컴포넌트
   ══════════════════════════════════════════════════ */
.luca-logo {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  text-decoration: none;
  cursor: pointer;
}

.luca-logo-letters {
  display: flex;
  align-items: center;
  gap: 0;
  font-size: 28px;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1;
}

.luca-logo.sm .luca-logo-letters { font-size: 20px; }
.luca-logo.xs .luca-logo-letters { font-size: 16px; }

.luca-letter {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  padding: 0 6px;
}

.luca-letter:not(:last-child) {
  border-right: 1.5px solid rgba(108,99,255,0.5);
}

.luca-logo-sub {
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
  padding-left: 6px;
  text-transform: uppercase;
}

.luca-logo-sub span { color: var(--text-muted); font-size: 9px; }

/* ══════════════════════════════════════════════════
   카드 / 패널
   ══════════════════════════════════════════════════ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: border-color .2s, box-shadow .2s;
}

.card:hover {
  border-color: var(--border-bright);
}

.card-sm { padding: 16px; border-radius: var(--radius-sm); }

/* ── 통계 카드 ── */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all .25s;
}

.stat-card:hover {
  border-color: var(--border-bright);
  box-shadow: var(--glow);
  transform: translateY(-2px);
}

.stat-icon {
  width: 52px; height: 52px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
  background: linear-gradient(135deg, rgba(108,99,255,0.2), rgba(0,212,255,0.2));
  border: 1px solid var(--border-bright);
  flex-shrink: 0;
}

.stat-body { flex: 1; }
.stat-value {
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ══════════════════════════════════════════════════
   버튼
   ══════════════════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border: none;
  outline: none;
  transition: all .2s;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: #fff;
}
.btn-primary:hover {
  opacity: .9;
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(108,99,255,0.5);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--purple);
  color: var(--text-primary);
}

.btn-sm { padding: 7px 14px; font-size: 13px; }

/* ══════════════════════════════════════════════════
   테이블
   ══════════════════════════════════════════════════ */
.luca-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.luca-table th {
  text-align: left;
  padding: 12px 16px;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
}

.luca-table td {
  padding: 13px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  vertical-align: middle;
  color: var(--text-secondary);
}

.luca-table tr:last-child td { border-bottom: none; }

.luca-table tr:hover td {
  background: rgba(108,99,255,0.05);
}

.luca-table .name-link {
  color: var(--text-primary);
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
}
.luca-table .name-link:hover {
  color: var(--cyan);
}

/* ── 진도율 바 ── */
.progress-bar {
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  overflow: hidden;
  min-width: 80px;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--purple), var(--cyan));
  border-radius: 3px;
  transition: width .4s ease;
}
.progress-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 3px;
}

/* ── 배지 ── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}
.badge-active {
  background: rgba(0,229,160,0.15);
  color: var(--success);
  border: 1px solid rgba(0,229,160,0.3);
}
.badge-inactive {
  background: rgba(107,122,153,0.15);
  color: var(--text-muted);
  border: 1px solid rgba(107,122,153,0.2);
}

/* ══════════════════════════════════════════════════
   입력 필드
   ══════════════════════════════════════════════════ */
.luca-input {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  color: var(--text-primary);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 14px;
  outline: none;
  transition: border-color .2s;
  width: 100%;
}
.luca-input:focus {
  border-color: var(--purple);
  box-shadow: 0 0 0 3px rgba(108,99,255,0.15);
}
.luca-input::placeholder { color: var(--text-muted); }

/* ══════════════════════════════════════════════════
   탭
   ══════════════════════════════════════════════════ */
.tabs {
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius-sm);
  padding: 4px;
  width: fit-content;
}

.tab-btn {
  padding: 8px 18px;
  border-radius: 8px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: #fff;
}

/* ══════════════════════════════════════════════════
   헤더 (공통)
   ══════════════════════════════════════════════════ */
.luca-header {
  height: var(--header-h);
  background: rgba(10,10,26,0.9);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand { flex: 0 0 auto; }
.header-spacer { flex: 1; }
.header-actions { display: flex; align-items: center; gap: 12px; }

.user-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 30px;
  padding: 6px 14px 6px 8px;
  font-size: 13px;
  color: var(--text-secondary);
}
.user-pill .avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  display: flex; align-items: center; justify-content: center;
  font-size: 12px;
  color: #fff;
  font-weight: 700;
}

.logout-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 14px;
  color: var(--text-muted);
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 13px;
  cursor: pointer;
  transition: all .2s;
}
.logout-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

/* ══════════════════════════════════════════════════
   사이드바
   ══════════════════════════════════════════════════ */
.luca-sidebar {
  width: var(--sidebar-w);
  background: rgba(10,10,26,0.7);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 12px;
  gap: 4px;
  height: calc(100vh - var(--header-h));
  position: sticky;
  top: var(--header-h);
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  color: var(--text-muted);
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  text-decoration: none;
  transition: all .2s;
  position: relative;
}
.nav-item:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.nav-item.active {
  background: linear-gradient(135deg, rgba(108,99,255,0.2), rgba(0,212,255,0.1));
  color: var(--text-primary);
  border: 1px solid rgba(108,99,255,0.3);
}
.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 50%;
  transform: translateY(-50%);
  width: 3px; height: 24px;
  background: linear-gradient(to bottom, var(--purple), var(--cyan));
  border-radius: 0 2px 2px 0;
}

.nav-item .nav-icon { font-size: 18px; flex-shrink: 0; }

.nav-badge {
  margin-left: auto;
  background: rgba(108,99,255,0.2);
  color: var(--purple);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 500;
}

.nav-section-label {
  padding: 16px 14px 6px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  text-transform: uppercase;
  font-weight: 600;
}

/* ══════════════════════════════════════════════════
   레이아웃 (대시보드)
   ══════════════════════════════════════════════════ */
.luca-layout {
  display: flex;
  height: calc(100vh - var(--header-h));
}

.luca-main {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 28px 32px;
  min-width: 0;
}

.page-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.page-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* ── 그리드 유틸 ── */
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }

.col-span-2 { grid-column: span 2; }
.col-span-3 { grid-column: span 3; }

/* ══════════════════════════════════════════════════
   활동 피드
   ══════════════════════════════════════════════════ */
.feed-item {
  display: flex;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(255,255,255,0.04);
}
.feed-item:last-child { border-bottom: none; }

.feed-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--purple);
  flex-shrink: 0;
  margin-top: 6px;
}
.feed-dot.cyan { background: var(--cyan); }

.feed-text { font-size: 13px; color: var(--text-secondary); line-height: 1.5; }
.feed-time { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* ══════════════════════════════════════════════════
   "준비 중" 섹션
   ══════════════════════════════════════════════════ */
.coming-soon {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  text-align: center;
  color: var(--text-muted);
  gap: 16px;
}
.coming-soon-icon {
  font-size: 56px;
  opacity: .4;
}
.coming-soon h3 { font-size: 20px; color: var(--text-secondary); font-weight: 500; }
.coming-soon p { font-size: 14px; max-width: 300px; line-height: 1.6; }

/* ══════════════════════════════════════════════════
   검색바
   ══════════════════════════════════════════════════ */
.search-bar {
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-wrap {
  position: relative;
  flex: 1;
  max-width: 320px;
}
.search-icon {
  position: absolute;
  left: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 16px;
  pointer-events: none;
}
.search-wrap input {
  padding-left: 38px;
}

/* ══════════════════════════════════════════════════
   학생 페이지 특화
   ══════════════════════════════════════════════════ */
.student-hero {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 24px;
}

.student-avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  color: #fff;
  font-weight: 700;
  flex-shrink: 0;
}

.student-info { flex: 1; }
.student-name { font-size: 22px; font-weight: 700; }
.student-meta { font-size: 13px; color: var(--text-muted); margin-top: 2px; }

.student-progress {
  text-align: right;
}
.progress-pct {
  font-size: 32px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}
.progress-pct-label { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* ── D-Day 카드 ── */
.dday-card {
  background: linear-gradient(135deg, rgba(108,99,255,0.15), rgba(0,212,255,0.1));
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.dday-badge {
  background: linear-gradient(135deg, var(--purple), var(--cyan));
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  padding: 10px 16px;
  border-radius: 12px;
  white-space: nowrap;
}
.dday-info h4 { font-size: 16px; font-weight: 600; }
.dday-info p { font-size: 13px; color: var(--text-muted); }

/* ── 코멘트 카드 ── */
.comment-card {
  background: linear-gradient(135deg, rgba(108,99,255,0.08), rgba(0,212,255,0.05));
  border: 1px solid rgba(108,99,255,0.2);
  border-radius: var(--radius);
  padding: 20px 24px;
}
.comment-label {
  font-size: 12px;
  color: var(--purple);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.comment-text {
  font-size: 15px;
  color: var(--text-primary);
  line-height: 1.7;
  font-style: italic;
}
.comment-author {
  margin-top: 10px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: right;
}

/* ── iframe 탭 ── */
.iframe-container {
  width: 100%;
  height: calc(100vh - 300px);
  min-height: 500px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.iframe-container iframe {
  width: 100%;
  height: 100%;
  border: none;
}
.iframe-full {
  width: 100%;
  height: calc(100vh - 160px);
  min-height: 600px;
  overflow: hidden;
}
.iframe-full iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
}

/* ══════════════════════════════════════════════════
   반응형
   ══════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .luca-sidebar { display: none; }
  .luca-main { padding: 20px 16px; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .col-span-3, .col-span-2 { grid-column: span 1; }
}

@media (max-width: 480px) {
  .grid-4, .grid-2 { grid-template-columns: 1fr; }
}

/* ══════════════════════════════════════════════════
   📱 모바일 완전 반응형 (루카 앱 전용)
   ══════════════════════════════════════════════════ */
@media (max-width: 768px) {

  /* 전체 페이지 */
  .student-page {
    padding: 16px 14px !important;
    padding-bottom: 80px !important;
  }

  /* 가로 스크롤 방지 */
  html, body { overflow-x: hidden !important; max-width: 100vw !important; }

  /* 헤더 — 손 볼 최소화 */
  .luca-header {
    position: sticky !important;
    top: 0 !important;
    z-index: 300 !important;
    padding: 4px 8px !important;
    height: 36px !important;
    min-height: 36px !important;
    gap: 4px !important;
    overflow: hidden !important;
  }
  /* 로고 — 글자만 작게 */
  .header-brand {
    flex-shrink: 0 !important;
  }
  .luca-logo-letters { font-size: 14px !important; gap: 1px !important; }
  .luca-letter { font-size: 14px !important; padding: 1px 3px !important; }
  .luca-logo-sub { display: none !important; }
  /* 안녕하세요 / 유저필 숨기기 */
  .user-pill { display: none !important; }
  /* 버튼들 한 줄 */
  .header-actions {
    gap: 3px !important;
    flex-shrink: 0 !important;
    flex-wrap: nowrap !important;
  }
  .guide-btn { padding: 3px 6px !important; font-size: 10px !important; min-height: 26px !important; }
  .header-actions a[href*="kakao"] { padding: 3px 6px !important; font-size: 10px !important; min-height: 26px !important; }
  .header-actions a[href*="kakao"] svg { width: 11px !important; height: 11px !important; }
  .logout-btn { padding: 3px 5px !important; font-size: 9px !important; min-height: 26px !important; }
  #notif-btn-student { padding: 2px 5px !important; font-size: 13px !important; min-height: 26px !important; }
  .header-spacer { display: none !important; }

  /* 탭 — 상단 탭을 하단 고정 네비로 변환 */
  .tabs {
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    top: auto !important;
    z-index: 200 !important;
    display: flex !important;
    flex-direction: row !important;
    background: rgba(10,10,26,0.97) !important;
    backdrop-filter: blur(20px) !important;
    border-top: 1px solid var(--border) !important;
    border-bottom: none !important;
    border-radius: 0 !important;
    padding: 6px 4px env(safe-area-inset-bottom, 6px) !important;
    gap: 0 !important;
    width: 100% !important;
    overflow-x: auto !important;
    scrollbar-width: none !important;
  }
  .tabs::-webkit-scrollbar { display: none !important; }

  .tab-btn {
    flex: 1 !important;
    min-width: 52px !important;
    padding: 6px 4px !important;
    font-size: 10px !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    gap: 2px !important;
    border-radius: 10px !important;
    white-space: nowrap !important;
    line-height: 1.3 !important;
  }

  /* 홈 그리드 → 세로 배치 */
  .home-grid {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
  }

  /* 카드 */
  .luca-card {
    padding: 16px !important;
    border-radius: 14px !important;
  }

  /* 모달 */
  .luca-modal-box {
    width: 95vw !important;
    padding: 20px 16px !important;
    border-radius: 16px !important;
    max-height: 88vh !important;
  }

  /* 버튼 터치 타겟 최소 44px */
  .luca-btn, .sh-btn-sm, .filter-btn, .guide-btn {
    min-height: 44px !important;
    font-size: 13px !important;
  }

  /* 수행평가 카드 */
  .sh-card-header {
    padding: 12px !important;
    gap: 8px !important;
  }
  .sh-title-line { font-size: 13px !important; }
  .sh-dday { font-size: 11px !important; padding: 2px 8px !important; }

  /* iframe 플래너 */
  .iframe-full {
    height: calc(100vh - 180px) !important;
    min-height: 400px !important;
  }

  /* 테이블 가로 스크롤 */
  table {
    display: block !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch !important;
  }

  /* 성적 탭 그리드 */
  .adm-folder-grid {
    grid-template-columns: 1fr !important;
  }

  /* 입력창 */
  .luca-input, .sh-memo-area, .adm-memo-area {
    font-size: 16px !important; /* iOS 줌 방지 */
  }

  /* 섹션 타이틀 */
  .section-title { font-size: 15px !important; }
  .card-title    { font-size: 14px !important; }

  /* 하단 탭 바 터치 최적화 + safe area */
  .tabs {
    padding: 8px 4px calc(env(safe-area-inset-bottom, 8px) + 8px) !important;
  }
  .tab-btn {
    min-height: 44px !important;
    font-size: 11px !important;
    padding: 6px 2px !important;
  }

  /* body 하단 여백 충분히 */
  body { padding-bottom: calc(80px + env(safe-area-inset-bottom, 0px)) !important; }

}

/* 아이패드 전용 (769~1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  .tabs {
    justify-content: center !important;
  }
  .tab-btn {
    padding: 8px 14px !important;
    font-size: 13px !important;
  }
  .home-grid {
    grid-template-columns: 1fr 1fr !important;
  }
}