* { box-sizing: border-box; }

body { 
  margin: 0; 
  background: var(--bg-gradient);
  display: flex; 
  justify-content: center; 
  align-items: center; 
  height: 100vh; 
  color: var(--text-main);
}

.wrap { 
  width: 440px; 
  background: rgba(255, 255, 255, 0.8); 
  backdrop-filter: blur(14px);
  padding: 48px; 
  border: 1px solid rgba(255, 255, 255, 0.8); 
  border-radius: 32px; 
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05);
}

h1 { 
    text-align: center; 
    font-size: 28px; 
    margin-bottom: 32px; 
    font-weight: 900;
    letter-spacing: -0.05em;
    color: var(--secondary-color);
}

/* 폼 그룹 레이아웃 */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 700; margin-bottom: 8px; color: var(--text-muted); }
.form-group input { 
    width: 100%; 
    padding: 14px; 
    border: 1px solid var(--border-color); 
    border-radius: 12px; 
    background: #f8fafc;
    font-family: inherit;
    transition: all 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: white;
    box-shadow: 0 0 0 4px rgba(34, 197, 94, 0.1);
}

/* --- 아이디 중복 확인 버튼 가로 배치를 위한 추가 스타일 --- */
.input-group {
  display: flex;      /* 가로 배치 */
  gap: 10px;           /* 입력창과 버튼 사이 간격 */
  align-items: flex-start; 
}

.input-group input {
  flex: 1;            /* 입력창이 왼쪽 공간을 다 차지함 */
}

.btn-check {
  width: auto;        /* 필요한 만큼만 너비 차지 */
  padding: 14px 20px;
  background: var(--secondary-color);
  color: #fff;
  border: none;
  border-radius: 12px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  white-space: nowrap; /* 버튼 글자 줄바꿈 방지 */
  transition: all 0.2s;
}

.btn-check:hover {
  background: #0f172a;
  transform: translateY(-1px);
}

.btn-check:disabled {
    background: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

/* 중복 검사 메시지 스타일 */
.id-msg {
  display: block;
  font-size: 12px;
  margin-top: 6px;
  font-weight: 700;
}
/* -------------------------------------------------- */

.btn-join { 
  width: 100%; 
  padding: 16px; 
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  color: #fff; 
  border: none; 
  border-radius: 12px; 
  font-weight: 800; 
  font-size: 16px;
  cursor: pointer; 
  margin-top: 24px; 
  box-shadow: 0 10px 15px -3px rgba(34, 197, 94, 0.2);
  transition: all 0.2s;
}

.btn-join:hover:not(:disabled) { 
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px rgba(34, 197, 94, 0.2);
}

.btn-join:disabled {
    background: var(--border-color);
    color: var(--text-muted);
    box-shadow: none;
    cursor: not-allowed;
}

.footer { text-align: center; margin-top: 24px; font-size: 13px; color: var(--text-muted); font-weight: 700; }
.footer a { color: var(--primary-color); text-decoration: none; margin-left: 4px; }
.footer a:hover { text-decoration: underline; }

.terms-group {
    margin-top: 24px;
    padding: 20px;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 16px;
}
.term-item {
    display: flex;
    align-items: center;
    font-size: 13px;
    font-weight: 700;
    color: var(--text-muted);
}
.term-item input {
    width: 18px !important; 
    height: 18px !important;
    margin-right: 12px;
    cursor: pointer;
    accent-color: var(--primary-color);
}
.term-item label {
    margin-bottom: 0 !important;
    cursor: pointer;
}
.view-link {
    margin-left: auto;
    font-size: 11px;
    color: var(--text-muted);
    text-decoration: none;
}
hr { border: 0; border-top: 1px solid #f1f5f9; margin: 12px 0; }