/* ============================================================
   단어야 놀자! (PlayVoca) - 공통 스타일 (style.css)
   - 스마트하고 청량한 오션/로열 블루 톤앤매너 (PlayHanja 오렌지와 차별화)
   - Gowun Dodum & Outfit 폰트 조화
   - 카드 플립, 발음(TTS) 재생, 퀴즈, 워크시트 인쇄 스타일 포함
   ============================================================ */

:root {
  --color-bg: #f5f8fc;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-secondary: #0ea5e9;
  --color-accent: #6366f1;
  --color-purple: #8b5cf6;
  --color-yellow: #f59e0b;
  --color-text: #1e293b;
  --color-text-soft: #64748b;
  --color-card: #ffffff;
  --color-border: #e2e8f0;
  --shadow-soft: 0 8px 24px rgba(37, 99, 235, 0.07);
  --shadow-hover: 0 12px 30px rgba(37, 99, 235, 0.15);
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --font-main: 'Gowun Dodum', 'Noto Sans KR', sans-serif;
  --font-en: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-main);
  background: var(--color-bg);
  color: var(--color-text);
  scroll-behavior: smooth;
  line-height: 1.6;
}

body {
  background-image:
    radial-gradient(circle at 10% 10%, #e0edff 0%, transparent 45%),
    radial-gradient(circle at 90% 15%, #e0f2fe 0%, transparent 40%),
    radial-gradient(circle at 50% 85%, #f1f5f9 0%, transparent 50%);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

a { text-decoration: none; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; cursor: pointer; border: none; outline: none; }
img { max-width: 100%; display: block; }

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------------- Header ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: #f5f8fc;
  border-bottom: 2px solid var(--color-border);
}

.site-header .nav-wrap {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  max-width: 1180px;
  margin: 0 auto;
  gap: 12px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  white-space: nowrap;
  flex-shrink: 0;
}

.logo span {
  white-space: nowrap;
}

.logo .logo-badge {
  font-family: var(--font-en);
  font-size: 1.3rem;
  font-weight: 800;
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: #fff;
  border-radius: 12px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
  flex-shrink: 0;
}

.main-nav {
  display: flex;
  align-items: center;
}

.nav-desktop {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-desktop a, .nav-group-btn {
  padding: 9px 15px;
  border-radius: 999px;
  font-weight: 700;
  color: var(--color-text-soft);
  transition: all .2s ease;
  font-size: 0.96rem;
  display: flex;
  align-items: center;
  gap: 6px;
  background: transparent;
}

.nav-desktop a:hover, .nav-desktop a.active,
.nav-group-btn:hover, .nav-group-btn.active {
  background: var(--color-primary);
  color: #fff;
}

.nav-group {
  position: relative;
}

.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-hover);
  border: 1px solid var(--color-border);
  padding: 8px;
  display: none;
  flex-direction: column;
  gap: 4px;
  z-index: 101;
}

.nav-group.open .nav-dropdown {
  display: flex;
}

.nav-dropdown a {
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--color-text);
  font-size: 0.92rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-dropdown a:hover {
  background: #eff6ff;
  color: var(--color-primary-dark);
}

.nav-dropdown a .nd-icon { font-size: 1.15rem; }
.nav-dropdown a .nd-body { display: flex; flex-direction: column; }
.nav-dropdown a strong { font-size: 0.9rem; }
.nav-dropdown a small { font-size: 0.75rem; color: #64748b; }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-primary-dark);
}

.nav-mobile { display: none; }

/* 네비게이션 로그인 칩 */
.nav-auth-box {
  position: relative;
  margin-left: auto;
  margin-right: 6px;
  flex-shrink: 0;
}

.btn-nav-login {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 7px 15px;
  border-radius: 999px;
  background: #fff;
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 0.9rem;
  border: 1.5px solid var(--color-primary);
  transition: all .2s;
  white-space: nowrap;
  flex-shrink: 0;
}
.btn-nav-login:hover {
  background: var(--color-primary);
  color: #fff;
}

.user-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1.5px solid var(--color-border);
  cursor: pointer;
  font-size: 0.88rem;
  font-weight: 700;
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
  white-space: nowrap;
  flex-shrink: 0;
}
.user-chip:hover { border-color: var(--color-primary); }
.user-avatar { font-size: 1rem; flex-shrink: 0; }
.user-name {
  white-space: nowrap;
  max-width: 80px;
  overflow: hidden;
  text-overflow: ellipsis;
  display: inline-block;
  vertical-align: middle;
}

.user-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 200px;
  background: #fff;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-hover);
  padding: 10px;
  z-index: 10001;
}
.user-menu-header {
  padding: 8px 10px;
  border-bottom: 1px solid #e2e8f0;
  margin-bottom: 6px;
}
.user-menu-header strong { display: block; font-size: 0.95rem; color: var(--color-text); }
.user-menu-header small { display: block; font-size: 0.78rem; color: #64748b; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-menu-body a, .user-menu-body button {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 0.88rem;
  color: var(--color-text);
  font-weight: 600;
  background: transparent;
  text-align: left;
}
.user-menu-body a:hover, .user-menu-body button:hover {
  background: #eff6ff;
  color: var(--color-primary-dark);
}

/* ---------------- 공통 버튼 & 뱃지 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  transition: all .2s ease;
  box-shadow: 0 4px 12px rgba(0,0,0,0.06);
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(37, 99, 235, 0.18);
}
.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: #fff;
}
.btn-secondary {
  background: linear-gradient(135deg, #0ea5e9, #0284c7);
  color: #fff;
}
.btn-accent {
  background: linear-gradient(135deg, #6366f1, #4f46e5);
  color: #fff;
}
.btn-outline {
  background: #fff;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
}
.badge-orange, .badge-blue { background: #eff6ff; color: #1d4ed8; }
.badge-green { background: #ecfdf5; color: #047857; }
.badge-purple { background: #f5f3ff; color: #6d28d9; }

/* ---------------- Hero Section ---------------- */
.hero {
  padding: 50px 0 40px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #fff;
  border: 1.5px solid #bfdbfe;
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  margin-bottom: 16px;
}
.hero-text h1 {
  font-size: 2.7rem;
  line-height: 1.25;
  margin: 0 0 18px;
  color: var(--color-text);
  letter-spacing: -0.5px;
}
.hero-text h1 span {
  color: var(--color-primary);
  background: linear-gradient(135deg, #2563eb, #0284c7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-text p.lead {
  font-size: 1.12rem;
  color: var(--color-text-soft);
  margin: 0 0 28px;
  line-height: 1.7;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 오늘의 추천 단어 대형 카드 */
.hero-card {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 30px;
  box-shadow: var(--shadow-soft);
  border: 1.5px solid var(--color-border);
  position: relative;
  overflow: hidden;
}
.hero-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, #3b82f6, #0ea5e9, #10b981, #6366f1);
}
.hc-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}
.hc-title {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  display: flex;
  align-items: center;
  gap: 6px;
}
.hc-word-box {
  text-align: center;
  padding: 20px 0;
}
.hc-word {
  font-family: var(--font-en);
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.15;
  margin-bottom: 8px;
}
.hc-pron {
  font-size: 1.05rem;
  color: var(--color-text-soft);
  margin-bottom: 14px;
}
.hc-meaning {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  background: #eff6ff;
  display: inline-block;
  padding: 8px 20px;
  border-radius: 999px;
  margin-bottom: 20px;
}
.hc-tools {
  display: flex;
  justify-content: center;
  gap: 10px;
}
.btn-speaker {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #fff;
  border: 1.5px solid #bfdbfe;
  color: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  transition: all .2s;
}
.btn-speaker:hover {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.08);
}

/* ---------------- 카테고리 그리드 ---------------- */
.section {
  padding: 50px 0;
}
.section-head {
  text-align: center;
  margin-bottom: 36px;
}
.section-head .eyebrow {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--color-primary);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.section-head h2 {
  font-size: 2.1rem;
  margin: 0 0 10px;
  color: var(--color-text);
}
.section-head p {
  color: var(--color-text-soft);
  margin: 0;
  font-size: 1.05rem;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
}
.category-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  transition: all .25s ease;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: #93c5fd;
}
.cc-top {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 14px;
}
.cc-icon {
  font-size: 2rem;
  background: #f0f7ff;
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.cc-info h3 {
  margin: 0 0 4px;
  font-size: 1.2rem;
  color: var(--color-text);
}
.cc-info p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--color-text-soft);
}
.cc-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  border-top: 1px dashed #e2e8f0;
}
.cc-count {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}
.cc-link {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 4px;
}
.cc-link:hover { text-decoration: underline; }

/* ---------------- 단어 학습 화면 (learn.html) ---------------- */
.learn-toolbar {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  margin-bottom: 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}
.category-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.cat-tab {
  padding: 8px 16px;
  border-radius: 999px;
  background: #f1f5f9;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-text-soft);
  transition: all .2s;
}
.cat-tab:hover, .cat-tab.active {
  background: var(--color-primary);
  color: #fff;
}
.learn-search-wrap {
  position: relative;
  min-width: 240px;
}
.learn-search-wrap input {
  width: 100%;
  padding: 10px 14px 10px 36px;
  border-radius: 999px;
  border: 1.5px solid var(--color-border);
  font-family: inherit;
  font-size: 0.92rem;
  background: #fff;
}
.learn-search-wrap i {
  position: absolute;
  top: 50%;
  left: 14px;
  transform: translateY(-50%);
  color: #94a3b8;
}

.word-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.word-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 20px;
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  position: relative;
  transition: all .2s;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.word-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.word-card.learned {
  border-color: #86efac;
  background: #f0fdf4;
}
.wc-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
}
.wc-word {
  font-family: var(--font-en);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--color-text);
  line-height: 1.2;
}
.wc-actions {
  display: flex;
  gap: 6px;
}
.btn-star, .btn-check {
  background: transparent;
  font-size: 1.15rem;
  color: #cbd5e1;
  padding: 4px;
  transition: all .2s;
}
.btn-star:hover, .btn-star.active { color: #f59e0b; }
.btn-check:hover, .btn-check.active { color: #10b981; }

.wc-pron {
  font-size: 0.9rem;
  color: #64748b;
  margin-bottom: 10px;
}
.wc-meaning {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 14px;
  transition: filter .2s;
}
.wc-meaning.masked {
  filter: blur(5px);
  user-select: none;
  cursor: pointer;
}
.wc-meaning.masked::after {
  content: ' (클릭하여 뜻 보기)';
  font-size: 0.8rem;
  font-weight: normal;
  color: #94a3b8;
}

/* 연상기법 & 기억법 박스 */
.wc-mnemonic-box {
  margin-top: 6px;
  margin-bottom: 12px;
}
.mnemonic-content {
  background: linear-gradient(135deg, #f0f7ff, #e8f2ff);
  border: 1.5px solid #bfdbfe;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.88rem;
  line-height: 1.5;
  color: #1e3a8a;
}
.mnemonic-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.74rem;
  font-weight: 800;
  background: #3b82f6;
  color: #fff;
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 6px;
}
.mnemonic-content p {
  margin: 0;
  font-weight: 600;
}
.btn-gen-mnemonic {
  background: #eff6ff;
  border: 1.5px dashed #60a5fa;
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all .2s;
}
.btn-gen-mnemonic:hover {
  background: #2563eb;
  color: #fff;
  border-style: solid;
}
.btn-gen-mnemonic:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.wc-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 10px;
  border-top: 1px solid #f1f5f9;
}

/* ---------------- 플래시카드 깜빡이 (flashcard.html) ---------------- */
.flashcard-stage {
  max-width: 600px;
  margin: 30px auto;
  perspective: 1000px;
}
.flashcard {
  width: 100%;
  height: 360px;
  position: relative;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1);
  cursor: pointer;
}
.flashcard.flipped {
  transform: rotateY(180deg);
}
.fc-face {
  position: absolute;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-hover);
  border: 2px solid var(--color-border);
  background: #fff;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}
.fc-back {
  transform: rotateY(180deg);
  background: linear-gradient(135deg, #f8fafc, #eff6ff);
  border-color: #bfdbfe;
}
.fc-word {
  font-family: var(--font-en);
  font-size: 3.2rem;
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 12px;
}
.fc-meaning {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary-dark);
  margin-bottom: 10px;
}
.fc-hint {
  font-size: 0.88rem;
  color: #64748b;
  margin-top: 14px;
}
.fc-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-top: 24px;
}

/* ---------------- 퀴즈 화면 (quiz.html) ---------------- */
.quiz-box {
  max-width: 680px;
  margin: 20px auto;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 36px;
  box-shadow: var(--shadow-soft);
  border: 1.5px solid var(--color-border);
}
.quiz-progress {
  height: 8px;
  background: #e2e8f0;
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 24px;
}
.quiz-progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #3b82f6, #0ea5e9);
  width: 0%;
  transition: width .3s ease;
}
.quiz-q-word {
  font-family: var(--font-en);
  font-size: 2.6rem;
  font-weight: 800;
  color: var(--color-text);
  text-align: center;
  margin: 16px 0;
}
.quiz-choices {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 24px;
}
.choice-btn {
  padding: 16px 20px;
  border-radius: var(--radius-md);
  border: 2px solid var(--color-border);
  background: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  text-align: left;
  transition: all .15s;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.choice-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: #eff6ff;
}
.choice-btn.correct {
  border-color: #10b981;
  background: #ecfdf5;
  color: #047857;
}
.choice-btn.wrong {
  border-color: #ef4444;
  background: #fef2f2;
  color: #b91c1c;
}

/* ---------------- 로그인/회원가입 카드 (login.html) ---------------- */
.auth-card {
  max-width: 440px;
  margin: 20px auto;
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow-soft);
}
.auth-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: 12px;
}
.auth-tab {
  flex: 1;
  padding: 10px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-soft);
  text-align: center;
}
.auth-tab.active {
  background: #eff6ff;
  color: var(--color-primary-dark);
}
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.auth-form label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-text);
}
.auth-form input {
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  font-family: inherit;
  font-size: 0.95rem;
}
.auth-form input:focus {
  border-color: var(--color-primary);
  outline: none;
}
.auth-submit {
  width: 100%;
  margin-top: 8px;
  padding: 13px;
}
.auth-link {
  background: transparent;
  color: #64748b;
  font-size: 0.85rem;
  text-align: center;
  margin-top: 4px;
  cursor: pointer;
}
.auth-link:hover { text-decoration: underline; color: var(--color-primary); }

.auth-oauth {
  margin-top: 20px;
}
.auth-divider {
  text-align: center;
  position: relative;
  margin-bottom: 16px;
}
.auth-divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: #e2e8f0;
}
.auth-divider span {
  position: relative;
  background: #fff;
  padding: 0 12px;
  font-size: 0.82rem;
  color: #94a3b8;
}
.btn-google {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px;
  border-radius: 999px;
  border: 1.5px solid #cbd5e1;
  background: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-text);
  box-shadow: 0 2px 6px rgba(0,0,0,0.04);
  transition: all .2s;
}
.btn-google:hover {
  background: #f8fafc;
  border-color: #94a3b8;
}

.auth-msg {
  margin-top: 14px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  display: none;
}
.auth-msg.error { display: block; background: #fef2f2; color: #b91c1c; }
.auth-msg.success { display: block; background: #ecfdf5; color: #047857; }

/* ---------------- 푸터 ---------------- */
.site-footer {
  background: #edf2f7;
  border-top: 2px solid var(--color-border);
  padding: 36px 0;
  margin-top: 60px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-soft);
}
.site-footer a { color: var(--color-primary-dark); font-weight: 700; }
.footer-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

/* ---------------- 워크시트 인쇄 스타일 (worksheet.html) ---------------- */
@media print {
  body { background: #fff !important; }
  .site-header, .site-footer, .worksheet-controls { display: none !important; }
  .worksheet-paper { box-shadow: none !important; border: none !important; padding: 0 !important; width: 100% !important; }
  .page-break { page-break-after: always; }
}

/* 메뉴가 열려 있는 동안 뒤쪽 본문 스크롤 잠금 */
body.nav-open {
  overflow: hidden;
}

@keyframes navSlideDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------------- 반응형 모바일 (Max 1024px) ---------------- */
@media (max-width: 1024px) {
  .site-header .nav-wrap {
    padding: 10px 16px;
    gap: 8px;
    flex-wrap: nowrap;
    position: relative;
  }
  .nav-desktop { display: none !important; }
  
  .nav-toggle {
    display: flex !important;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 10px;
    cursor: pointer;
    flex-shrink: 0;
    transition: all .2s;
  }
  .nav-toggle[aria-expanded="true"] {
    background: var(--color-primary);
    color: #fff;
  }
  
  .hero-grid { grid-template-columns: 1fr; gap: 30px; }
  .hero-text h1 { font-size: 2.2rem; }
  
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #f8fafc;
    border-bottom: 3px solid var(--color-border);
    box-shadow: 0 16px 32px rgba(15, 23, 42, 0.18);
    max-height: calc(100vh - 64px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    padding: 16px;
    z-index: 9999;
  }
  
  .main-nav.open {
    display: block !important;
    animation: navSlideDown 0.2s ease-out;
  }
  
  .nav-mobile {
    display: flex;
    flex-direction: column;
    gap: 10px;
    list-style: none;
    padding: 0;
    margin: 0;
  }
  .nav-mobile li {
    list-style: none;
  }
  .nav-mobile a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background: #fff;
    border-radius: var(--radius-sm);
    font-weight: 700;
    border: 1px solid var(--color-border);
    color: var(--color-text);
    transition: all .2s;
    text-decoration: none;
    font-size: 0.98rem;
  }
  .nav-mobile a:hover {
    background: #eff6ff;
    color: var(--color-primary-dark);
    border-color: var(--color-primary);
  }
  .nav-mobile a.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
  }
  .m-group {
    list-style: none;
  }
  .m-group-title {
    font-size: 0.88rem;
    font-weight: 800;
    color: var(--color-primary-dark);
    margin: 10px 4px 6px;
    display: block;
  }
  .m-sub {
    display: flex;
    flex-direction: column;
    gap: 6px;
    list-style: none;
    padding: 0;
    margin: 0;
  }
  .m-sub li {
    list-style: none;
  }
  .m-sub a {
    padding: 10px 14px;
    font-size: 0.92rem;
  }
}

/* ---------------- 모바일 소형 화면 (Max 480px) ---------------- */
@media (max-width: 480px) {
  .site-header .nav-wrap {
    padding: 8px 12px;
    gap: 8px;
  }
  .logo {
    font-size: 1.15rem;
    gap: 6px;
  }
  .logo .logo-badge {
    width: 32px;
    height: 32px;
    font-size: 1.05rem;
    border-radius: 9px;
  }
  .btn-nav-login {
    padding: 5px 10px;
    font-size: 0.8rem;
    gap: 4px;
  }
  .user-chip {
    padding: 5px 10px;
    font-size: 0.8rem;
  }
  .flashcard {
    height: 320px;
  }
  .fc-face {
    padding: 24px 16px;
  }
  .fc-word {
    font-size: 2.3rem;
  }
  .fc-meaning {
    font-size: 1.5rem;
  }
  .quiz-card {
    padding: 20px 16px;
  }
  .quiz-word {
    font-size: 1.9rem;
  }
}