/* =============================================
   Design Tokens (main.css와 동일 토큰 사용)
============================================= */
:root {
  --color-bg:               #f7f6f2;
  --color-surface:          #ffffff;
  --color-surface-hover:    #f3f7f5;
  --color-border:           #d4d1ca;
  --color-text:             #28251d;
  --color-text-muted:       #7a7974;
  --color-primary:          #01696f;
  --color-primary-hover:    #0c4e54;
  --color-primary-highlight:#cedcd8;
  --color-error:            #a12c7b;
  --color-error-bg:         #f9f0f5;
  --color-error-border:     #e0ced7;
  --color-success:          #437a22;
  --radius-sm:  0.375rem;
  --radius-lg:  0.75rem;
  --radius-xl:  1rem;
  --shadow-md:  0 4px 16px oklch(0.2 0.01 80 / 0.09);
  --shadow-lg:  0 8px 32px oklch(0.2 0.01 80 / 0.13);
  --transition: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --text-sm:    clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base:  clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
}

/* =============================================
   Base Reset
============================================= */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  -webkit-font-smoothing: antialiased;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  background-color: var(--color-bg);
  font-family: 'Pretendard', 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
}

img   { display: block; max-width: 100%; height: auto; }
button { cursor: pointer; background: none; border: none; font: inherit; }
a      { text-decoration: none; color: inherit; }

/* =============================================
   Layout
============================================= */
.login-wrapper {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-8) var(--space-4);
  width: 100%;
  max-width: 480px;
}

/* =============================================
   Logo
============================================= */
.logo-area img {
  width: clamp(200px, 50vw, 300px);
  height: auto;
  object-fit: contain;
}

/* =============================================
   Login Card
============================================= */
.login-card {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid oklch(from #28251d l c h / 0.10);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

/* =============================================
   Alert — 로그인 실패
============================================= */
.alert-error {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: var(--radius-lg);
  color: var(--color-error);
  font-size: var(--text-sm);
  font-weight: 500;
  animation: fadeSlideIn 220ms ease forwards;
}

.alert-error svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  stroke-width: 2;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* =============================================
   Form
============================================= */
form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* =============================================
   Field Group
============================================= */
.field-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.field-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

/* =============================================
   Input Wrap
============================================= */
.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: var(--space-3);
  width: 18px;
  height: 18px;
  color: var(--color-text-muted);
  stroke-width: 1.75;
  pointer-events: none;
}

.field-input {
  width: 100%;
  padding: var(--space-3) var(--space-3) var(--space-3) calc(var(--space-3) + 18px + var(--space-2));
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-surface);
  transition:
    border-color var(--transition),
    box-shadow var(--transition);
  outline: none;
}

.field-input::placeholder {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

.field-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-highlight);
}

/* 비밀번호 input — 오른쪽에 눈 버튼 공간 확보 */
#userPwd {
  padding-right: calc(var(--space-3) + 20px + var(--space-2));
}

/* 유효성 상태 */
.field-group.is-invalid .field-input {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px var(--color-error-border);
}

.field-group.is-valid .field-input {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px oklch(from #437a22 l c h / 0.15);
}

/* =============================================
   Toggle Password Button
============================================= */
.toggle-pwd {
  position: absolute;
  right: var(--space-3);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  padding: 0;
  line-height: 1;
  transition: color var(--transition);
}

.toggle-pwd:hover { color: var(--color-primary); }

.toggle-pwd svg {
  width: 18px;
  height: 18px;
  stroke-width: 1.75;
}

/* =============================================
   Field Message
============================================= */
.field-msg {
  font-size: clamp(0.75rem, 0.7rem + 0.2vw, 0.875rem);
  min-height: 1em;
  transition: color var(--transition);
}

.field-group.is-invalid .field-msg { color: var(--color-error); }
.field-group.is-valid   .field-msg { color: var(--color-success); }

/* =============================================
   Login Button
============================================= */
.btn-login {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  margin-top: var(--space-2);
  background: var(--color-primary);
  color: #ffffff;
  border: 1.5px solid var(--color-primary);
  border-radius: var(--radius-lg);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.02em;
  transition:
    background var(--transition),
    border-color var(--transition),
    transform var(--transition),
    box-shadow var(--transition);
}

.btn-login:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
}

.btn-login:active {
  transform: translateY(1px);
  opacity: 0.9;
}

/* =============================================
   Responsive
============================================= */
@media (max-width: 480px) {
  .login-card {
    padding: var(--space-6) var(--space-4);
  }
}