/* ============================================================
   /auth/login — page-scoped (mockup 04-teacher-login 포팅)
   ============================================================ */

:root {
  --bg:              #F8FAFC;
  --bg-cool:         #F1F5F9;
  --surface:         #FFFFFF;
  --primary:         #2563EB;
  --primary-hover:   #1D4ED8;
  --primary-dark:    #1E40AF;
  --primary-soft:    #EFF6FF;
  --primary-tint:    #DBEAFE;
  --text-primary:    #0F172A;
  --text-secondary:  #475569;
  --text-tertiary:   #94A3B8;
  --border:          #E2E8F0;
  --border-strong:   #CBD5E1;
  --error:           #DC2626;
  --error-soft:      #FEE2E2;
  --warning:         #B45309;
  --warning-soft:    #FEF3C7;
  --shadow-sm:       0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md:       0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-lg:       0 16px 40px rgba(15, 23, 42, 0.08);
  --radius:          14px;
  --radius-sm:       10px;
  --font-display:    'Pretendard Variable', Pretendard, 'Inter', -apple-system, system-ui, sans-serif;
  --font-mono:       'Inter', 'JetBrains Mono', monospace;
}

/* Reset — specificity 0 으로 둬야 아래의 명시 padding/margin 룰이 이긴다.
   login.css는 /auth/login에서만 로드되므로 page 스코프 의도와 충돌 없음. */
* { box-sizing: border-box; margin: 0; padding: 0; }

body.login-page {
  font-family: var(--font-display);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

body.login-page::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image:
    radial-gradient(circle at 20% 20%, rgba(37, 99, 235, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 80% 80%, rgba(99, 102, 241, 0.04) 0%, transparent 45%);
  pointer-events: none;
  z-index: 0;
}
body.login-page > * { position: relative; z-index: 1; }

/* ---------- Nav ---------- */
.login-nav {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 14px 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.login-nav .logo {
  font-weight: 700;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.login-nav .logo svg { width: 26px; height: 26px; }
.login-nav .nav-right { display: flex; align-items: center; gap: 14px; }
.nav-back-link {
  font-size: 13px;
  color: var(--text-tertiary);
  text-decoration: none;
  font-weight: 500;
}
.nav-back-link:hover { color: var(--text-secondary); }
.lang-selector {
  display: flex;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}
.lang-selector button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 5px 10px;
  border-radius: 6px;
  color: var(--text-tertiary);
  font-family: inherit;
  font-size: 13px;
  font-weight: 600;
}
.lang-selector .active { background: var(--primary-soft); color: var(--primary); }

/* ---------- Main ---------- */
.login-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
}
.login-wrap { width: 100%; max-width: 440px; }

/* ---------- Header ---------- */
.login-header { text-align: center; margin-bottom: 32px; }
.login-icon {
  width: 64px; height: 64px;
  border-radius: 16px;
  background: var(--primary-soft);
  color: var(--primary);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 22px;
  box-shadow: 0 0 0 8px rgba(37, 99, 235, 0.04);
}
.login-icon svg { width: 30px; height: 30px; }
.login-title {
  font-size: 28px; font-weight: 700;
  letter-spacing: -0.025em; line-height: 1.25;
  margin-bottom: 8px;
}
.login-subtitle { color: var(--text-secondary); font-size: 15px; }

/* ---------- Flashes (전역 알림) ---------- */
.login-flashes { margin-bottom: 18px; display: flex; flex-direction: column; gap: 8px; }
.login-flash {
  padding: 12px 14px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  display: flex; align-items: center; gap: 8px;
  border: 1px solid transparent;
}
.login-flash.error   { background: var(--error-soft);   color: var(--error);   border-color: rgba(220, 38, 38, 0.18); }
.login-flash.warning { background: var(--warning-soft); color: var(--warning); border-color: rgba(180, 83, 9, 0.18); }
.login-flash.info    { background: var(--primary-soft); color: var(--primary-dark); border-color: rgba(37, 99, 235, 0.18); }
.login-flash svg { width: 16px; height: 16px; flex-shrink: 0; }

/* ---------- Form ---------- */
.login-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow-lg);
}
.form-group { margin-bottom: 18px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.form-input-wrap { position: relative; }
.form-input {
  width: 100%;
  padding: 13px 14px;
  border: 1.5px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  background: var(--surface);
  color: var(--text-primary);
  transition: all 0.15s;
}
.form-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.form-input::placeholder { color: var(--text-tertiary); }

.form-input.with-icon { padding-left: 40px; }
.form-input.with-toggle { padding-right: 44px; }

.form-input-icon {
  position: absolute;
  left: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-tertiary);
  pointer-events: none;
}
.form-input-icon svg { width: 18px; height: 18px; }

.form-input-toggle {
  position: absolute;
  right: 8px; top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 6px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
  transition: background 0.15s;
}
.form-input-toggle:hover { background: var(--bg-cool); color: var(--text-secondary); }
.form-input-toggle svg { width: 18px; height: 18px; }

.form-error {
  margin-top: 6px;
  font-size: 12px;
  color: var(--error);
  font-weight: 500;
}

.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  font-size: 13px;
}
.form-check {
  display: flex; align-items: center; gap: 7px;
  color: var(--text-secondary);
  cursor: pointer;
  font-weight: 500;
}
.form-check input { accent-color: var(--primary); cursor: pointer; }
.form-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}
.form-link:hover { text-decoration: underline; }

.login-submit {
  width: 100%;
  background: var(--primary);
  color: white;
  border: none;
  padding: 14px;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: all 0.15s;
}
.login-submit:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}
.login-submit:active { transform: translateY(0); }
.login-submit svg { width: 18px; height: 18px; }

.login-bottom {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
}
.login-bottom a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
}
.login-bottom a:hover { text-decoration: underline; }

/* ---------- Help / Security / Dev hint ---------- */
.help-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 18px;
  margin-top: 18px;
  display: flex; gap: 12px; align-items: flex-start;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.6;
}
.help-card svg {
  width: 18px; height: 18px;
  flex-shrink: 0; margin-top: 1px;
  color: var(--text-tertiary);
}
.help-card strong { color: var(--text-primary); font-weight: 700; }

.security-row {
  display: flex;
  gap: 14px;
  margin-top: 16px;
  padding: 10px 14px;
  background: rgba(37, 99, 235, 0.04);
  border: 1px solid rgba(37, 99, 235, 0.08);
  border-radius: 10px;
  font-size: 12px;
  color: var(--text-secondary);
  align-items: center;
  flex-wrap: wrap;
}
.security-badge {
  display: flex; align-items: center; gap: 4px;
  font-weight: 600;
  color: var(--primary-dark);
}
.security-badge svg { width: 12px; height: 12px; color: var(--primary); }
.security-divider { width: 1px; height: 12px; background: var(--border); }

.dev-hint {
  margin-top: 18px;
  padding: 12px 14px;
  border-radius: 10px;
  background: var(--warning-soft);
  color: var(--warning);
  border: 1px dashed rgba(180, 83, 9, 0.35);
  font-size: 12px;
  font-family: var(--font-mono);
  line-height: 1.65;
}
.dev-hint code {
  background: rgba(180, 83, 9, 0.12);
  padding: 1px 6px;
  border-radius: 5px;
  font-size: 12px;
}

/* ---------- Footer ---------- */
.login-footer {
  padding: 24px 32px;
  text-align: center;
  color: var(--text-tertiary);
  font-size: 12px;
}
.login-footer a { color: var(--text-tertiary); text-decoration: none; margin: 0 8px; }
.login-footer a:hover { color: var(--text-secondary); }

/* ---------- Responsive ---------- */
@media (max-width: 480px) {
  .login-nav { padding: 12px 18px; }
  .nav-back-link { display: none; }
  .login-main { padding: 24px 16px; }
  .login-title { font-size: 24px; }
  .login-form { padding: 24px 20px; }
}