/* ========== 登录页 ========== */
.login-page {
  display: flex;
  min-height: 100vh;
}

/* ---------- 左侧品牌区 ---------- */
.brand-panel {
  position: relative;
  flex: 1 1 55%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 48px 64px;
  color: #fff;
  background: linear-gradient(135deg, #4263eb 0%, #3b5bdb 45%, #364fc7 100%);
  overflow: hidden;
}

.brand-bg { position: absolute; inset: 0; pointer-events: none; }
.bubble {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, .08);
  animation: float 12s ease-in-out infinite;
}
.b1 { width: 420px; height: 420px; top: -140px; right: -120px; }
.b2 { width: 260px; height: 260px; bottom: -80px; left: -60px; animation-delay: -4s; }
.b3 { width: 140px; height: 140px; bottom: 30%; right: 18%; background: rgba(255, 212, 59, .15); animation-delay: -8s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(20px, -24px); }
}

.brand-content { position: relative; z-index: 1; max-width: 520px; }

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .5px;
  margin-bottom: 72px;
}
.brand-logo img { width: 42px; height: 42px; box-shadow: 0 6px 18px rgba(0, 0, 0, .15); border-radius: 12px; }

.brand-title { font-size: 40px; line-height: 1.3; font-weight: 700; margin-bottom: 18px; }
.brand-desc { font-size: 16px; line-height: 1.8; opacity: .85; margin-bottom: 48px; }

.brand-features { list-style: none; display: grid; gap: 22px; }
.brand-features li { display: flex; gap: 16px; align-items: flex-start; }
.feature-icon {
  flex: none;
  width: 44px; height: 44px;
  display: grid; place-items: center;
  font-size: 20px;
  border-radius: 12px;
  background: rgba(255, 255, 255, .14);
  backdrop-filter: blur(4px);
}
.brand-features strong { display: block; font-size: 15px; margin-bottom: 4px; }
.brand-features p { font-size: 13px; opacity: .75; }

.brand-footer { position: relative; z-index: 1; font-size: 12px; opacity: .6; }

/* ---------- 右侧表单区 ---------- */
.form-panel {
  flex: 1 1 45%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 24px;
  background: var(--white);
}

.login-card { width: 100%; max-width: 400px; }

.mobile-logo { display: none; }

.card-title { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.card-subtitle { color: var(--text-secondary); margin-bottom: 36px; }

.form-item { margin-bottom: 6px; }
.form-item label { display: block; font-weight: 500; margin-bottom: 8px; }

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1;
}
.input-wrap input {
  width: 100%;
  height: 44px;
  padding: 0 40px 0 42px;
  font-size: 14px;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fafbfc;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.input-wrap input::placeholder { color: var(--text-placeholder); }
.input-wrap input:hover { border-color: #c5ccd8; }
.input-wrap input:focus {
  border-color: var(--primary-light);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(92, 124, 250, .15);
}

.input-icon {
  position: absolute; left: 14px;
  width: 18px; height: 18px;
  fill: var(--text-placeholder);
  pointer-events: none;
  transition: fill var(--transition);
}
.input-wrap:focus-within .input-icon { fill: var(--primary); }

.input-action {
  position: absolute; right: 8px;
  width: 28px; height: 28px;
  display: grid; place-items: center;
  font-size: 12px;
  color: var(--text-placeholder);
  border-radius: 6px;
  transition: background var(--transition), color var(--transition);
}
.input-action:hover { background: #eef1f6; color: var(--text-secondary); }
.input-action svg { width: 18px; height: 18px; fill: currentColor; }

.error-text { min-height: 20px; padding-top: 4px; font-size: 12px; color: var(--warning); }

.form-item.is-error .input-wrap input { border-color: var(--danger); }
.form-item.is-error .input-wrap input:focus { box-shadow: 0 0 0 3px rgba(224, 49, 49, .12); }
.form-item.is-error .error-text { color: var(--danger); }

/* 验证码 */
.captcha-row { display: flex; gap: 12px; }
.captcha-canvas {
  flex: none;
  width: 110px; height: 44px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
}

/* 选项行 */
.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 4px 0 20px;
}
.checkbox { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; color: var(--text-secondary); user-select: none; }
.checkbox input { display: none; }
.checkbox-box {
  position: relative;
  width: 16px; height: 16px;
  border: 1px solid #c5ccd8;
  border-radius: 4px;
  transition: all var(--transition);
}
.checkbox input:checked + .checkbox-box { background: var(--primary); border-color: var(--primary); }
.checkbox input:checked + .checkbox-box::after {
  content: "";
  position: absolute; left: 4.5px; top: 1.5px;
  width: 4px; height: 8px;
  border: solid #fff; border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}
.link:hover { color: var(--primary-dark); text-decoration: underline; }

/* 提示 */
.alert {
  padding: 10px 14px;
  margin-bottom: 16px;
  font-size: 13px;
  border-radius: 8px;
}
.alert-error { color: var(--danger); background: #fff5f5; border: 1px solid #ffc9c9; }
.alert-success { color: var(--success); background: #ebfbee; border: 1px solid #b2f2bb; }
.alert-info { color: var(--primary); background: #edf2ff; border: 1px solid #bac8ff; }

/* 主按钮 */
.btn-primary {
  width: 100%;
  height: 46px;
  display: flex; align-items: center; justify-content: center; gap: 8px;
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  border-radius: var(--radius);
  background: linear-gradient(90deg, var(--primary-light), var(--primary));
  box-shadow: 0 8px 20px rgba(59, 91, 219, .28);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}
.btn-primary:hover:not(:disabled) { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(59, 91, 219, .36); }
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled { opacity: .7; cursor: not-allowed; }

.spinner {
  width: 16px; height: 16px;
  border: 2px solid rgba(255, 255, 255, .4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.demo-tip { margin-top: 24px; text-align: center; font-size: 12px; color: var(--text-placeholder); }
.demo-tip code { padding: 1px 6px; color: var(--text-secondary); background: #f1f3f5; border-radius: 4px; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .brand-panel { display: none; }
  .form-panel { background: var(--bg); }
  .login-card {
    padding: 36px 28px;
    background: var(--white);
    border-radius: 16px;
    box-shadow: var(--shadow);
  }
  .mobile-logo {
    display: flex; align-items: center; justify-content: center; gap: 10px;
    margin-bottom: 28px;
    font-size: 20px; font-weight: 700; color: var(--primary);
  }
  .mobile-logo img { width: 36px; height: 36px; }
  .card-title, .card-subtitle { text-align: center; }
}