/* ── login.html 전용 스타일 v5 — Dark Forest Edition ── */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&family=Noto+Sans+KR:wght@400;500;600;700&display=swap');

:root {
  --error:    #F87171;
  --error-bg: rgba(248,113,113,0.1);
  --admin-bg: #0A0E0B;
  --admin-gold: #F59E0B;
}

body {
  font-family: 'Noto Sans KR', sans-serif;
  background: var(--bg-base);
  color: var(--text-dark);
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 24px; position: relative; overflow-x: hidden;
  visibility: visible; opacity: 1;
}

/* 배경 효과 */
body::before {
  content: '';
  position: fixed; inset: 0;
  background:
    radial-gradient(ellipse at 20% 30%, rgba(34,197,94,0.07) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 70%, rgba(34,197,94,0.04) 0%, transparent 50%);
  pointer-events: none; z-index: 0;
}

.back-btn {
  position: absolute; top: 24px; left: 24px;
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; font-weight: 700; color: var(--text-mid);
  text-decoration: none; padding: 8px 16px;
  background: var(--bg-elevated); border-radius: 20px;
  border: 1px solid var(--green-border);
  box-shadow: var(--shadow-sm); transition: all 0.25s; z-index: 10;
}
.back-btn:hover { transform: translateX(-4px); border-color: var(--green-vivid); color: var(--green-vivid); }

/* ── 메인 카드 ── */
.auth-card {
  background: var(--bg-card);
  width: 100%; max-width: 420px;
  border-radius: 24px;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(34,197,94,0.06);
  border: 1px solid var(--green-border);
  overflow: hidden; position: relative; z-index: 1;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.auth-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(34,197,94,0.5), transparent);
}

.auth-head { text-align: center; padding: 44px 32px 28px; }

.logo-mark {
  width: 72px; height: 72px;
  background: var(--green-vivid);
  border-radius: 20px;
  display: flex; align-items: center; justify-content: center;
  font-family: 'Playfair Display', serif;
  font-size: 18px; font-weight: 700; color: var(--btn-on-green);
  letter-spacing: -1px; white-space: nowrap;
  margin: 0 auto 20px;
  box-shadow: 0 8px 24px rgba(34,197,94,0.35), 0 0 40px rgba(34,197,94,0.15);
  transition: transform 0.3s;
}
.auth-card:hover .logo-mark { transform: rotate(-4deg) scale(1.04); }

.auth-head h1 {
  font-family: 'Playfair Display', serif;
  font-size: 28px; font-weight: 700;
  margin-bottom: 10px; color: var(--text-dark);
  letter-spacing: -0.5px;
}
.auth-head p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

/* ── 탭 ── */
.tabs {
  display: flex; border-bottom: 1px solid var(--green-border); margin-bottom: 28px;
}
.tab {
  flex: 1; text-align: center; padding: 16px 0;
  font-size: 14px; font-weight: 700; color: var(--text-muted);
  cursor: pointer; border-bottom: 2px solid transparent;
  transition: all 0.25s; position: relative;
}
.tab.active { color: var(--text-dark); border-bottom-color: var(--green-vivid); }
.tab:hover:not(.active) { color: var(--green-bright); background: var(--green-glow); }

/* ── 폼 ── */
.form-area { padding: 0 32px 44px; }
.form-view { display: none; }
.form-view.active { display: block; animation: slideIn 0.35s ease-out; }
@keyframes slideIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

.input-group { margin-bottom: 18px; position: relative; }
.input-label { display: block; font-size: 12px; font-weight: 700; color: var(--text-mid); margin-bottom: 8px; letter-spacing: 0.4px; }

.input-field {
  width: 100%; padding: 14px 16px;
  border: 1px solid var(--green-border);
  border-radius: 12px; font-size: 14px;
  font-family: 'Noto Sans KR', sans-serif; outline: none;
  transition: all 0.2s; background: var(--bg-elevated);
  color: var(--text-dark);
}
.input-field::placeholder { color: var(--text-muted); }
.input-field:focus {
  border-color: var(--green-vivid);
  background: var(--bg-hover);
  box-shadow: 0 0 0 3px rgba(34,197,94,0.1);
}
.input-field.has-error { border-color: var(--error); background: var(--error-bg); }

.pw-toggle {
  position: absolute; right: 14px; top: 38px;
  font-size: 16px; cursor: pointer; opacity: 0.4; transition: opacity 0.2s;
}
.pw-toggle:hover { opacity: 0.8; }

.err-msg {
  font-size: 11px; color: var(--error); margin-top: 6px;
  display: none; font-weight: 500; animation: shake 0.3s;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

/* 비밀번호 강도 */
.pw-strength { display: flex; gap: 4px; margin-top: 8px; }
.strength-bar { height: 4px; flex: 1; background: var(--bg-hover); border-radius: 2px; transition: all 0.4s; }
.strength-text { font-size: 11px; font-weight: 700; margin-top: 5px; text-align: right; color: var(--text-muted); }

/* 약관 */
.terms-box {
  background: var(--bg-elevated); padding: 16px; border-radius: 14px;
  margin-bottom: 24px; border: 1px solid var(--green-border);
}
.checkbox-lbl {
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: var(--text-mid); font-weight: 500;
  cursor: pointer; margin-bottom: 10px;
}
.checkbox-lbl:last-child { margin-bottom: 0; }
.checkbox-lbl input { width: 16px; height: 16px; accent-color: var(--green-vivid); cursor: pointer; }
.terms-link { color: var(--green-vivid); text-decoration: underline; margin-left: auto; font-size: 11px; font-weight: 700; }

/* ── 버튼 ── */
.btn-submit {
  width: 100%; padding: 16px;
  background: var(--green-vivid); color: var(--btn-on-green);
  border: none; border-radius: 14px;
  font-size: 15px; font-weight: 700; cursor: pointer;
  font-family: 'Noto Sans KR', sans-serif; transition: all 0.25s;
  box-shadow: 0 4px 16px rgba(34,197,94,0.25), 0 0 30px rgba(34,197,94,0.1);
}
.btn-submit:hover {
  background: var(--green-bright);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(34,197,94,0.35);
}
.btn-submit:active { transform: translateY(0); }

/* ── 소셜 로그인 ── */
.social-login { margin-top: 28px; text-align: center; }
.divider {
  display: flex; align-items: center; gap: 12px;
  font-size: 12px; color: var(--text-muted);
  margin-bottom: 18px; font-weight: 500;
}
.divider::before, .divider::after { content: ''; flex: 1; height: 1px; background: var(--green-border); }

.btn-social {
  width: 100%; padding: 13px; margin-bottom: 10px;
  border: 1px solid var(--green-border); border-radius: 12px;
  font-size: 14px; font-weight: 700; cursor: pointer;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  background: var(--bg-elevated); color: var(--text-mid);
  font-family: 'Noto Sans KR', sans-serif; transition: all 0.2s;
}
.btn-social:hover { background: var(--bg-hover); border-color: var(--green-border-bright); color: var(--text-dark); }
.btn-social.kakao { background: #FEE500; border-color: #FEE500; color: #191919; }
.btn-social.kakao:hover { background: #FADB00; }

/* 관리자 */
.admin-toggle-link {
  text-align: center; margin-top: 22px; font-size: 12px;
  color: var(--text-muted); text-decoration: underline; cursor: pointer; transition: color 0.2s;
}
.admin-toggle-link:hover { color: var(--green-bright); }

.auth-card.is-admin {
  background: #0A0E0B;
  border-color: rgba(245,158,11,0.25);
  box-shadow: var(--shadow-lg), 0 0 60px rgba(245,158,11,0.05);
}
.auth-card.is-admin::before {
  background: linear-gradient(90deg, transparent, rgba(245,158,11,0.4), transparent);
}
.auth-card.is-admin .auth-head h1 { color: var(--text-dark); }
.auth-card.is-admin .auth-head p { color: var(--text-muted); }
.auth-card.is-admin .logo-mark {
  background: var(--admin-gold); color: #0A0E0B;
  box-shadow: 0 8px 24px rgba(245,158,11,0.3);
}
.auth-card.is-admin .input-field { border-color: rgba(245,158,11,0.15); }
.auth-card.is-admin .input-field:focus { border-color: var(--admin-gold); box-shadow: 0 0 0 3px rgba(245,158,11,0.12); }
.auth-card.is-admin .btn-submit { background: var(--admin-gold); color: #0A0E0B; box-shadow: 0 4px 16px rgba(245,158,11,0.25); }
.auth-card.is-admin .btn-submit:hover { background: #fbbf24; }

/* 가입 성공 */
.success-view {
  display: none; text-align: center; padding: 48px 32px;
  animation: scaleUp 0.45s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
@keyframes scaleUp { from { opacity: 0; transform: scale(0.92); } to { opacity: 1; transform: scale(1); } }
.success-icon { font-size: 68px; margin-bottom: 22px; animation: bounce 2s infinite; }
@keyframes bounce { 0%,20%,50%,80%,100% {transform:translateY(0);} 40% {transform:translateY(-18px);} 60% {transform:translateY(-9px);} }
.success-view h2 { font-family: 'Playfair Display', serif; font-size: 28px; color: var(--text-dark); margin-bottom: 14px; }
.success-view p { font-size: 14px; color: var(--text-muted); margin-bottom: 32px; line-height: 1.7; }